initial lab1

CMakeLists.txt

+cmake_minimum_required( VERSION 3.8 )
+project(CMINUSF)
+
+set(CMAKE_C_FLAGS "${CMAKE_CXX_FLAGS} -std=c99")
+
+SET(CMAKE_CXX_FLAGS_DEBUG "$ENV{CXXFLAGS} -O0 -Wall -g2 -ggdb")
+SET(CMAKE_CXX_FLAGS_RELEASE "$ENV{CXXFLAGS} -O3 -Wall")
+SET(CMAKE_CXX_FLAGS_ASAN "${CMAKE_CXX_FLAGS_DEBUG} -fsanitize=undefined -fsanitize=address")
+
+set(default_build_type "Debug")
+
+if(NOT(CMAKE_BUILD_TYPE_SHADOW STREQUAL CMAKE_BUILD_TYPE))
+    if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
+        message(STATUS "Setting build type to '${default_build_type}'")
+        set(CMAKE_BUILD_TYPE "${default_build_type}" CACHE STRING "Choose the type of build." FORCE)
+    else()
+        message(STATUS "Building in ${CMAKE_BUILD_TYPE} mode")
+    endif()
+
+    set(CMAKE_BUILD_TYPE_SHADOW ${CMAKE_BUILD_TYPE} CACHE STRING "used to detect changes in build type" FORCE)
+endif()
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+find_package(FLEX REQUIRED)
+find_package(BISON REQUIRED)
+find_package(LLVM REQUIRED CONFIG)
+message(STATUS "Found LLVM ${LLVM_PACKAGE_VERSION}")
+message(STATUS "Using LLVMConfig.cmake in: ${LLVM_DIR}")
+llvm_map_components_to_libnames(
+    llvm_libs
+    support
+    core
+)
+
+INCLUDE_DIRECTORIES(
+    include
+    include/cminusfc
+    include/common
+    include/lightir
+    ${LLVM_INCLUDE_DIRS}
+)
+
+add_definitions(${LLVM_DEFINITIONS})
+
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR})
+set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR})
+set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR})
+
+include_directories(${PROJECT_SOURCE_DIR})
+include_directories(${PROJECT_BINARY_DIR})
+add_subdirectory(src)

README.md

+# 简介
+
+本仓库为 USTC 编译原理和技术 2024 的课程实验仓库。在本学期的编译实验中，你们将构建一个从词法分析器开始到后端代码生成的JIANMU编译器。
+
+你们需要 fork 此 repo 到自己的仓库下，随后在自己的仓库中完成实验。
+
+## 测试脚本使用方法
+
+eval_phase1.sh: 测试phase1 词法分析器+语法分析器部分
+
+    -all: 测试所有测试集 (easy, normal, hard, testcases_general)
+
+    easy/normal/hard/testcases_general + yes/no/verbose: 测试单个测试集
+
+        yes: 使用diff判断正确性
+
+        no: 不使用diff判断正确性
+
+        verbose: 使用diff判断正确性，并看到更详细的输出
+
+eval_phase2.sh: 测试phase2 syntax_tree -> ast 部分
+
+    使用方法与eval_phase1.sh完全相同, 会自动跳过生成syntax_tree fail的样例
+    
\ No newline at end of file

include/common/ast.hpp

+#pragma once
+
+extern "C" {
+#include "syntax_tree.h"
+extern syntax_tree *parse(const char *input);
+}
+#include <memory>
+#include <string>
+#include <vector>
+
+enum CminusType { TYPE_INT, TYPE_FLOAT, TYPE_VOID };
+
+enum RelOp {
+    // <=
+    OP_LE,
+    // <
+    OP_LT,
+    // >
+    OP_GT,
+    // >=
+    OP_GE,
+    // ==
+    OP_EQ,
+    // !=
+    OP_NEQ
+};
+
+enum AddOp {
+    // +
+    OP_PLUS,
+    // -
+    OP_MINUS
+};
+
+enum MulOp {
+    // *
+    OP_MUL,
+    // /
+    OP_DIV
+};
+
+class AST;
+
+struct ASTNode;
+struct ASTProgram;
+struct ASTDeclaration;
+struct ASTNum;
+struct ASTVarDeclaration;
+struct ASTFunDeclaration;
+struct ASTParam;
+
+struct ASTCompoundStmt;
+struct ASTStatement;
+struct ASTExpressionStmt;
+struct ASTSelectionStmt;
+struct ASTIterationStmt;
+struct ASTReturnStmt;
+struct ASTFactor;
+struct ASTExpression;
+struct ASTVar;
+struct ASTAssignExpression;
+struct ASTSimpleExpression;
+struct ASTAdditiveExpression;
+struct ASTTerm;
+struct ASTCall;
+
+class ASTVisitor;
+
+class AST {
+  public:
+    AST() = delete;
+    AST(syntax_tree *);
+    AST(AST &&tree) {
+        root = tree.root;
+        tree.root = nullptr;
+    };
+    ASTProgram *get_root() { return root.get(); }
+    void run_visitor(ASTVisitor &visitor);
+
+  private:
+    ASTNode *transform_node_iter(syntax_tree_node *);
+    std::shared_ptr<ASTProgram> root = nullptr;
+};
+
+struct ASTNode {
+    virtual void accept(ASTVisitor &) = 0;
+    virtual ~ASTNode() = default;
+};
+
+struct ASTProgram : ASTNode {
+    virtual void accept(ASTVisitor &) override final;
+    virtual ~ASTProgram() = default;
+    std::vector<std::shared_ptr<ASTDeclaration>> declarations;
+};
+
+struct ASTDeclaration : ASTNode {
+    virtual ~ASTDeclaration() = default;
+    CminusType type;
+    std::string id;
+};
+
+struct ASTFactor : ASTNode {
+    virtual ~ASTFactor() = default;
+};
+
+struct ASTNum : ASTFactor {
+    virtual void accept(ASTVisitor &) override final;
+    CminusType type;
+    union {
+        int i_val;
+        float f_val;
+    };
+};
+
+struct ASTVarDeclaration : ASTDeclaration {
+    virtual void accept(ASTVisitor &) override final;
+    std::shared_ptr<ASTNum> num;
+};
+
+struct ASTFunDeclaration : ASTDeclaration {
+    virtual void accept(ASTVisitor &) override final;
+    std::vector<std::shared_ptr<ASTParam>> params;
+    std::shared_ptr<ASTCompoundStmt> compound_stmt;
+};
+
+struct ASTParam : ASTNode {
+    virtual void accept(ASTVisitor &) override final;
+    CminusType type;
+    std::string id;
+    // true if it is array param
+    bool isarray;
+};
+
+struct ASTStatement : ASTNode {
+    virtual ~ASTStatement() = default;
+};
+
+struct ASTCompoundStmt : ASTStatement {
+    virtual void accept(ASTVisitor &) override final;
+    std::vector<std::shared_ptr<ASTVarDeclaration>> local_declarations;
+    std::vector<std::shared_ptr<ASTStatement>> statement_list;
+};
+
+struct ASTExpressionStmt : ASTStatement {
+    virtual void accept(ASTVisitor &) override final;
+    std::shared_ptr<ASTExpression> expression;
+};
+
+struct ASTSelectionStmt : ASTStatement {
+    virtual void accept(ASTVisitor &) override final;
+    std::shared_ptr<ASTExpression> expression;
+    std::shared_ptr<ASTStatement> if_statement;
+    // should be nullptr if no else structure exists
+    std::shared_ptr<ASTStatement> else_statement;
+};
+
+struct ASTIterationStmt : ASTStatement {
+    virtual void accept(ASTVisitor &) override final;
+    std::shared_ptr<ASTExpression> expression;
+    std::shared_ptr<ASTStatement> statement;
+};
+
+struct ASTReturnStmt : ASTStatement {
+    virtual void accept(ASTVisitor &) override final;
+    // should be nullptr if return void
+    std::shared_ptr<ASTExpression> expression;
+};
+
+struct ASTExpression : ASTFactor {};
+
+struct ASTAssignExpression : ASTExpression {
+    virtual void accept(ASTVisitor &) override final;
+    std::shared_ptr<ASTVar> var;
+    std::shared_ptr<ASTExpression> expression;
+};
+
+struct ASTSimpleExpression : ASTExpression {
+    virtual void accept(ASTVisitor &) override final;
+    std::shared_ptr<ASTAdditiveExpression> additive_expression_l;
+    std::shared_ptr<ASTAdditiveExpression> additive_expression_r;
+    RelOp op;
+};
+
+struct ASTVar : ASTFactor {
+    virtual void accept(ASTVisitor &) override final;
+    std::string id;
+    // nullptr if var is of int type
+    std::shared_ptr<ASTExpression> expression;
+};
+
+struct ASTAdditiveExpression : ASTNode {
+    virtual void accept(ASTVisitor &) override final;
+    std::shared_ptr<ASTAdditiveExpression> additive_expression;
+    AddOp op;
+    std::shared_ptr<ASTTerm> term;
+};
+
+struct ASTTerm : ASTNode {
+    virtual void accept(ASTVisitor &) override final;
+    std::shared_ptr<ASTTerm> term;
+    MulOp op;
+    std::shared_ptr<ASTFactor> factor;
+};
+
+struct ASTCall : ASTFactor {
+    virtual void accept(ASTVisitor &) override final;
+    std::string id;
+    std::vector<std::shared_ptr<ASTExpression>> args;
+};
+
+class ASTVisitor {
+  public:
+    virtual void visit(ASTProgram &) = 0;
+    virtual void visit(ASTNum &) = 0;
+    virtual void visit(ASTVarDeclaration &) = 0;
+    virtual void visit(ASTFunDeclaration &) = 0;
+    virtual void visit(ASTParam &) = 0;
+    virtual void visit(ASTCompoundStmt &) = 0;
+    virtual void visit(ASTExpressionStmt &) = 0;
+    virtual void visit(ASTSelectionStmt &) = 0;
+    virtual void visit(ASTIterationStmt &) = 0;
+    virtual void visit(ASTReturnStmt &) = 0;
+    virtual void visit(ASTAssignExpression &) = 0;
+    virtual void visit(ASTSimpleExpression &) = 0;
+    virtual void visit(ASTAdditiveExpression &) = 0;
+    virtual void visit(ASTVar &) = 0;
+    virtual void visit(ASTTerm &) = 0;
+    virtual void visit(ASTCall &) = 0;
+};
+
+class ASTPrinter : public ASTVisitor {
+  public:
+    virtual void visit(ASTProgram &) override final;
+    virtual void visit(ASTNum &) override final;
+    virtual void visit(ASTVarDeclaration &) override final;
+    virtual void visit(ASTFunDeclaration &) override final;
+    virtual void visit(ASTParam &) override final;
+    virtual void visit(ASTCompoundStmt &) override final;
+    virtual void visit(ASTExpressionStmt &) override final;
+    virtual void visit(ASTSelectionStmt &) override final;
+    virtual void visit(ASTIterationStmt &) override final;
+    virtual void visit(ASTReturnStmt &) override final;
+    virtual void visit(ASTAssignExpression &) override final;
+    virtual void visit(ASTSimpleExpression &) override final;
+    virtual void visit(ASTAdditiveExpression &) override final;
+    virtual void visit(ASTVar &) override final;
+    virtual void visit(ASTTerm &) override final;
+    virtual void visit(ASTCall &) override final;
+    void add_depth() { depth += 2; }
+    void remove_depth() { depth -= 2; }
+
+  private:
+    int depth = 0;
+};

include/common/logging.hpp

+#ifndef LOGGING_HPP
+#define LOGGING_HPP
+
+#include <iostream>
+#include <sstream>
+#include <cstdlib>
+
+enum LogLevel
+{
+    DEBUG = 0,
+    INFO,
+    WARNING,
+    ERROR
+};
+struct LocationInfo
+{
+    LocationInfo(std::string file, int line, const char *func) : file_(file), line_(line), func_(func) {}
+    ~LocationInfo() = default;
+
+    std::string file_;
+    int line_;
+    const char *func_;
+};
+class LogStream;
+class LogWriter;
+
+class LogWriter
+{
+public:
+    LogWriter(LocationInfo location, LogLevel loglevel)
+        : location_(location), log_level_(loglevel)
+    {
+        char *logv = std::getenv("LOGV");
+        if (logv)
+        {
+            std::string string_logv = logv;
+            env_log_level = std::stoi(logv);
+        }
+        else
+        {
+            env_log_level = 4;
+        }
+    };
+
+    void operator<(const LogStream &stream);
+
+private:
+    void output_log(const std::ostringstream &g);
+    LocationInfo location_;
+    LogLevel log_level_;
+    int env_log_level;
+};
+
+class LogStream
+{
+public:
+    template <typename T>
+    LogStream &operator<<(const T &val) noexcept
+    {
+        sstream_ << val;
+        return *this;
+    }
+
+    friend class LogWriter;
+
+private:
+    std::stringstream sstream_{};
+};
+
+std::string level2string(LogLevel level);
+std::string get_short_name(const char *file_path);
+
+#define __FILESHORTNAME__ get_short_name(__FILE__)
+#define LOG_IF(level) \
+    LogWriter(LocationInfo(__FILESHORTNAME__, __LINE__, __FUNCTION__), level) < LogStream()
+#define LOG(level) LOG_##level
+#define LOG_DEBUG LOG_IF(DEBUG)
+#define LOG_INFO LOG_IF(INFO)
+#define LOG_WARNING LOG_IF(WARNING)
+#define LOG_ERROR LOG_IF(ERROR)
+
+#endif

include/common/syntax_tree.h

+#ifndef __SYNTAXTREE_H__
+#define __SYNTAXTREE_H__
+
+#include <stdio.h>
+
+#define SYNTAX_TREE_NODE_NAME_MAX 30
+
+struct _syntax_tree_node {
+	struct _syntax_tree_node * parent;
+	struct _syntax_tree_node * children[10];
+	int children_num;
+
+	char name[SYNTAX_TREE_NODE_NAME_MAX];
+};
+typedef struct _syntax_tree_node syntax_tree_node;
+
+syntax_tree_node * new_anon_syntax_tree_node();
+syntax_tree_node * new_syntax_tree_node(const char * name);
+int syntax_tree_add_child(syntax_tree_node * parent, syntax_tree_node * child);
+void del_syntax_tree_node(syntax_tree_node * node, int recursive);
+
+struct _syntax_tree {
+	syntax_tree_node * root;
+};
+typedef struct _syntax_tree syntax_tree;
+
+syntax_tree* new_syntax_tree();
+void del_syntax_tree(syntax_tree * tree);
+void print_syntax_tree(FILE * fout, syntax_tree * tree);
+
+#endif /* SyntaxTree.h */

src/CMakeLists.txt

+add_subdirectory(parser)
+add_subdirectory(common)
+add_subdirectory(logging)
+add_subdirectory(cminusfc)

src/cminusfc/CMakeLists.txt

+add_executable(
+    cminusfc
+    main.cpp
+)
+
+target_link_libraries(
+    cminusfc
+    common
+    syntax
+    stdc++fs
+)
+
+install(
+    TARGETS cminusfc
+    RUNTIME DESTINATION bin
+)

src/cminusfc/main.cpp

+#include "ast.hpp"
+
+#include <filesystem>
+#include <iostream>
+#include <string>
+
+using std::string;
+using std::operator""s;
+
+struct Config
+{
+    string exe_name; // compiler exe name
+    std::filesystem::path input_file;
+    std::filesystem::path output_file;
+
+    bool emitast{false};
+
+    Config(int argc, char **argv) : argc(argc), argv(argv)
+    {
+        parse_cmd_line();
+        check();
+    }
+
+private:
+    int argc{-1};
+    char **argv{nullptr};
+
+    void parse_cmd_line();
+    void check();
+    // print helper infomation and exit
+    void print_help() const;
+    void print_err(const string &msg) const;
+};
+
+int main(int argc, char **argv)
+{
+    Config config(argc, argv);
+    auto syntax_tree = parse(config.input_file.c_str());
+    auto ast = AST(syntax_tree);
+    ASTPrinter printer;
+    ast.run_visitor(printer);
+
+    return 0;
+}
+
+void Config::parse_cmd_line()
+{
+    exe_name = argv[0];
+    for (int i = 1; i < argc; ++i)
+    {
+        if (argv[i] == "-h"s || argv[i] == "--help"s)
+        {
+            print_help();
+        }
+        else if (argv[i] == "-o"s)
+        {
+            if (output_file.empty() && i + 1 < argc)
+            {
+                output_file = argv[i + 1];
+                i += 1;
+            }
+            else
+            {
+                print_err("bad output file");
+            }
+        }
+        else if (argv[i] == "-emit-ast"s)
+        {
+            emitast = true;
+        }
+        else
+        {
+            if (input_file.empty())
+            {
+                input_file = argv[i];
+            }
+            else
+            {
+                string err =
+                    "unrecognized command-line option \'"s + argv[i] + "\'"s;
+                print_err(err);
+            }
+        }
+    }
+}
+
+void Config::check()
+{
+    if (input_file.empty())
+    {
+        print_err("no input file");
+    }
+    if (input_file.extension() != ".cminus")
+    {
+        print_err("file format not recognized");
+    }
+    if (output_file.empty())
+    {
+        output_file = input_file.stem();
+    }
+}
+
+void Config::print_help() const
+{
+    std::cout << "Usage: " << exe_name
+              << " [-h|--help] [-o <target-file>] [-mem2reg] [-emit-llvm] [-S] "
+                 "<input-file>"
+              << std::endl;
+    exit(0);
+}
+
+void Config::print_err(const string &msg) const
+{
+    std::cout << exe_name << ": " << msg << std::endl;
+    exit(-1);
+}

src/common/CMakeLists.txt

+add_library(common STATIC
+    syntax_tree.c
+    ast.cpp
+    logging.cpp
+)
+
+target_link_libraries(common)
+

src/common/logging.cpp

+#include "logging.hpp"
+
+void LogWriter::operator<(const LogStream &stream) {
+    std::ostringstream msg;
+    msg << stream.sstream_.rdbuf();
+    output_log(msg);
+}
+
+void LogWriter::output_log(const std::ostringstream &msg) {
+    if (log_level_ >= env_log_level)
+        std::cout << "[" << level2string(log_level_) << "] " 
+                    << "(" <<  location_.file_ 
+                    << ":" << location_.line_ 
+                    << "L  "<< location_.func_<<")"
+                    << msg.str() << std::endl;
+
+}
+std::string level2string(LogLevel level) {
+    switch (level)
+    {
+        case DEBUG:
+            return "DEBUG";
+            
+        case INFO:
+            return "INFO";
+
+        case WARNING:
+            return "WARNING";
+
+        case ERROR:
+            return "ERROR";
+
+        default:
+            return "";
+    }
+}
+std::string get_short_name(const char * file_path) {
+    std::string short_file_path = file_path;
+    int index = short_file_path.find_last_of('/');
+
+    return short_file_path.substr(index+1);
+}

src/common/syntax_tree.c

+#include <stdlib.h>
+#include <string.h>
+
+#include "syntax_tree.h"
+
+syntax_tree_node * new_syntax_tree_node(const char * name)
+{
+	syntax_tree_node * new_node = (syntax_tree_node *)malloc(sizeof(syntax_tree_node));
+	if (name)
+		strncpy(new_node->name, name, SYNTAX_TREE_NODE_NAME_MAX);
+	else
+		new_node->name[0] = '\0';
+	new_node->children_num = 0;
+	return new_node;
+}
+
+int syntax_tree_add_child(syntax_tree_node * parent, syntax_tree_node * child)
+{
+	if (!parent || !child)	return -1;
+	parent->children[parent->children_num++] = child;
+	return parent->children_num;
+}
+
+void del_syntax_tree_node(syntax_tree_node * node, int recursive)
+{
+	if (!node)	return;
+
+	int i;
+	if (recursive) {
+		for (i = 0; i < node->children_num; i++) {
+			del_syntax_tree_node(node->children[i], 1);
+		}
+	}
+	free(node);
+}
+
+syntax_tree * new_syntax_tree()
+{
+	return (syntax_tree *)malloc(sizeof(syntax_tree));
+}
+
+void del_syntax_tree(syntax_tree * tree)
+{
+	if (!tree)	return;
+
+	if (tree->root) {
+		del_syntax_tree_node(tree->root, 1);
+	}
+	free(tree);
+}
+
+void print_syntax_tree_node(FILE * fout, syntax_tree_node * node, int level)
+{
+	// assume fout valid now
+	
+	// check if "node" empty pointer
+	if (!node)	return;
+	
+	// print myself
+	int i;
+	for (i = 0; i < level; i++) {
+		fprintf(fout, "|  ");
+	}
+	fprintf(fout, ">--%s %s\n", (node->children_num ? "+" : "*"), node->name);
+
+	for (i = 0; i < node->children_num; i++) {
+		print_syntax_tree_node(fout, node->children[i], level + 1);
+	}
+}
+
+void print_syntax_tree(FILE * fout, syntax_tree * tree)
+{
+	if (!fout)	return;
+	
+	print_syntax_tree_node(fout, tree->root, 0);
+}
+

src/logging/CMakeLists.txt

+add_executable(test_ast test_ast.cpp)
+add_executable(test_logging test_logging.cpp)
+target_link_libraries(test_ast syntax common)
+target_link_libraries(test_logging common)
+
+install(
+    TARGETS test_logging
+    RUNTIME DESTINATION bin
+)
+
+install(
+    TARGETS test_ast
+    RUNTIME DESTINATION bin
+)

src/logging/test_ast.cpp

+#include "ast.hpp"
+
+#include <iostream>
+
+int main(int argc, char **argv) {
+    if (argc != 2) {
+        std::cout << "usage: " << argv[0] << " <cminus_file>" << std::endl;
+    } else {
+        auto s = parse(argv[1]);
+        auto a = AST(s);
+        auto printer = ASTPrinter();
+        a.run_visitor(printer);
+    }
+    return 0;
+}

src/logging/test_logging.cpp

+#include "logging.hpp"
+// 引入头文件
+int main() {
+    LOG(DEBUG) << "This is DEBUG log item.";
+    // 使用关键字LOG，括号中填入要输出的日志等级
+    // 紧接着就是<<以及日志的具体信息，这一步就跟使用std::cout一样
+    LOG(INFO) << "This is INFO log item";
+    LOG(WARNING) << "This is WARNING log item";
+    LOG(ERROR) << "This is ERROR log item";
+
+    return 0;
+}
\ No newline at end of file

src/parser/CMakeLists.txt

+flex_target(lex lexical_analyzer.l ${CMAKE_CURRENT_BINARY_DIR}/lexical_analyzer.c)
+bison_target(syntax syntax_analyzer.y
+  ${CMAKE_CURRENT_BINARY_DIR}/syntax_analyzer.c
+  DEFINES_FILE ${PROJECT_BINARY_DIR}/syntax_analyzer.h)
+
+add_flex_bison_dependency(lex syntax)
+add_library(syntax STATIC
+  ${BISON_syntax_OUTPUTS}
+  ${FLEX_lex_OUTPUTS}
+)
+
+include_directories(${PROJECT_BINARY_DIR})
+add_executable(parser parser.c)
+target_link_libraries(parser syntax common)
+add_executable(lexer lexer.c)
+target_link_libraries(lexer syntax common)
+
+install(
+    TARGETS parser
+    RUNTIME DESTINATION bin
+)
+
+install(
+    TARGETS lexer
+    RUNTIME DESTINATION bin
+)

src/parser/lexer.c

+#include<stdio.h>
+#include<stdlib.h>
+#include<string.h>
+#include<syntax_analyzer.h>
+
+///
+extern int lines;
+extern int pos_start;
+extern int pos_end;
+
+///
+extern FILE *yyin;
+extern char *yytext;
+extern int yylex();
+
+// Mac-only hack.
+YYSTYPE yylval;
+
+///
+int main(int argc, const char **argv) {
+     if (argc != 2) {
+          printf("usage: lexer input_file\n");
+          return 0;
+     }
+
+     const char *input_file = argv[1];
+     yyin = fopen(input_file, "r");
+     if (!yyin) {
+          fprintf(stderr, "cannot open file: %s\n", input_file);
+          return 1;
+     }
+
+     int token;
+     printf("%5s\t%10s\t%s\t%s\n", "Token", "Text", "Line", "Column (Start,End)");
+     while ((token = yylex())) {
+          printf("%-5d\t%10s\t%d\t(%d,%d)\n",
+                 token, yytext,
+                 lines, pos_start, pos_end);
+     }
+     return 0;
+}

src/parser/lexical_analyzer.l

+%option noyywrap
+%{
+/*****************声明和选项设置  begin*****************/
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "syntax_tree.h"
+#include "syntax_analyzer.h"
+
+int lines=1;
+int pos_start=1;
+int pos_end=1;
+
+void pass_node(char *text){
+     yylval.node = new_syntax_tree_node(text);
+}
+
+/*****************声明和选项设置  end*****************/
+
+%}
+
+%x COMMENT
+
+%%
+ /* to do for students */
+ /* two cases for you, pass_node will send flex's token to bison */
+\+ 	{pos_start = pos_end; pos_end += 1; pass_node(yytext); return ADD;}
+\-	{pos_start = pos_end; pos_end += 1; pass_node(yytext); return SUB;}
+\*	{pos_start = pos_end; pos_end += 1; pass_node(yytext); return MUL;}
+\/	{pos_start = pos_end; pos_end += 1; pass_node(yytext); return DIV;}
+\<	{pos_start = pos_end; pos_end += 1; pass_node(yytext); return LT;}
+\<=	{pos_start = pos_end; pos_end += 2; pass_node(yytext); return LTE;}
+\>	{pos_start = pos_end; pos_end += 1; pass_node(yytext); return GT;}
+\>=	{pos_start = pos_end; pos_end += 2; pass_node(yytext); return GTE;}
+==	{pos_start = pos_end; pos_end += 2; pass_node(yytext); return EQ;}
+!=	{pos_start = pos_end; pos_end += 2; pass_node(yytext); return NEQ;}
+=	{pos_start = pos_end; pos_end += 1; pass_node(yytext); return ASSIN;}
+;	{pos_start = pos_end; pos_end += 1; pass_node(yytext); return SEMICOLON;}
+,	{pos_start = pos_end; pos_end += 1; pass_node(yytext); return COMMA;}
+ /* TODO: phase1. 请在这里补充其他的词法规则 */
+
+
+. { pos_start = pos_end; pos_end++; return ERROR; }
+
+ /****请在此补全所有flex的模式与动作  end******/
+%%

src/parser/parser.c

+#include "syntax_tree.h"
+extern syntax_tree *parse(const char*);
+
+int main(int argc, char *argv[])
+{
+    syntax_tree *tree = NULL;
+    const char *input = NULL;
+
+    if (argc == 2) {
+        input = argv[1];
+    } else if(argc >= 3) {
+        printf("usage: %s <cminus_file>\n", argv[0]);
+        return 1;
+    }
+
+    // Call the syntax analyzer.
+    tree = parse(input);
+    print_syntax_tree(stdout, tree);
+    del_syntax_tree(tree);
+    return 0;
+}

src/parser/syntax_analyzer.y

+%{
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+
+#include "syntax_tree.h"
+
+// external functions from lex
+extern int yylex();
+extern int yyparse();
+extern int yyrestart();
+extern FILE * yyin;
+
+// external variables from lexical_analyzer module
+extern int lines;
+extern char * yytext;
+extern int pos_end;
+extern int pos_start;
+
+// Global syntax tree
+syntax_tree *gt;
+
+// Error reporting
+void yyerror(const char *s);
+
+// Helper functions written for you with love
+syntax_tree_node *node(const char *node_name, int children_num, ...);
+%}
+
+/* Complete this definition.
+   Hint: See pass_node(), node(), and syntax_tree.h.
+         Use forward declaring. */
+%union {
+     struct _syntax_tree_node * node;
+	 char * name;
+}
+
+/* Your tokens here. */
+%token <node> ERROR
+%token <node> ADD
+%token <node> SUB
+%token <node> MUL
+%token <node> DIV
+%token <node> LT
+%token <node> LTE
+%token <node> GT
+%token <node> GTE
+%token <node> EQ
+%token <node> NEQ
+%token <node> ASSIN
+%token <node> SEMICOLON
+%token <node> COMMA
+%token <node> LPARENTHESE
+%token <node> RPARENTHESE
+%token <node> LBRACKET
+%token <node> RBRACKET
+%token <node> LBRACE
+%token <node> RBRACE
+%token <node> ELSE
+%token <node> IF
+%token <node> INT
+%token <node> RETURN
+%token <node> VOID
+%token <node> WHILE
+%token <node> IDENTIFIER
+%token <node> INTEGER
+%token <node> FLOAT
+%token <node> FLOATPOINT	// 这个是 float 类型的 token
+//%token <node> EOL
+//%token <node> BLANK
+//%token <node> COMMENT
+%type <node> program declaration-list declaration var-declaration type-specifier fun-declaration params param-list param compound-stmt local-declarations statement-list statement expression-stmt selection-stmt iteration-stmt return-stmt expression var simple-expression relop additive-expression addop term mulop factor integer float call args arg-list
+
+/* compulsory starting symbol */
+%start program
+
+%%
+/* Your rules here. TA has completed many */
+
+program : 	declaration-list {$$ = node( "program", 1, $1); gt->root = $$;}
+		;
+
+declaration-list 	: 	declaration-list declaration {$$ = node( "declaration-list", 2, $1, $2);}
+					|	declaration {$$ = node( "declaration-list", 1, $1);}
+					;
+
+declaration : 	var-declaration {$$ = node( "declaration", 1, $1);}
+			| 	fun-declaration {$$ = node( "declaration", 1, $1);}
+			;
+
+var-declaration : 	type-specifier IDENTIFIER SEMICOLON {$$ = node( "var-declaration", 3, $1, $2, $3);}
+                | 	type-specifier IDENTIFIER LBRACKET INTEGER RBRACKET SEMICOLON {$$ = node( "var-declaration", 6, $1, $2, $3, $4, $5, $6);}
+                ;
+
+type-specifier 	: 	INT {$$ = node( "type-specifier", 1, $1);}
+				| 	FLOAT { $$ = node( "type-specifier", 1, $1); }
+				| 	VOID {$$ = node( "type-specifier", 1, $1);}
+				;
+
+fun-declaration : 	type-specifier IDENTIFIER LPARENTHESE params RPARENTHESE compound-stmt {$$ = node( "fun-declaration", 6, $1, $2, $3, $4, $5, $6);}
+				;
+
+params 	: 	param-list {$$ = node( "params", 1, $1);}
+		|	VOID {$$ = node( "params", 1, $1);}
+		;
+
+param-list 	: 	param-list COMMA param {$$ = node( "param-list", 3, $1, $2, $3);}
+			| 	param {$$ = node( "param-list", 1, $1);}
+			;
+
+param 	: 	type-specifier IDENTIFIER {$$ = node( "param", 2, $1, $2);}
+		| 	type-specifier IDENTIFIER LBRACKET RBRACKET {$$ = node( "param", 4, $1, $2, $3, $4);}
+		;
+
+compound-stmt 	: 	LBRACE local-declarations statement-list RBRACE {$$ = node( "compound-stmt", 4, $1, $2, $3, $4);}
+				;
+
+local-declarations 	: 	local-declarations var-declaration {$$ = node( "local-declarations", 2, $1, $2);}
+| 	{$$ = node( "local-declarations",0);}
+					;
+
+statement-list 	: 	statement-list statement {$$ = node( "statement-list", 2, $1, $2);}
+| 	{$$ = node( "statement-list",0);}
+
+// TODO: phase1. 补充其他的文法产生式逻辑
+
+%%
+
+/// The error reporting function.
+void yyerror(const char * s)
+{
+    // TO STUDENTS: This is just an example.
+    // You can customize it as you like.
+    fprintf(stderr, "error at line %d column %d: %s\n", lines, pos_start, s);
+}
+
+/// Parse input from file `input_path`, and prints the parsing results
+/// to stdout.  If input_path is NULL, read from stdin.
+///
+/// This function initializes essential states before running yyparse().
+syntax_tree *parse(const char *input_path)
+{
+    if (input_path != NULL) {
+        if (!(yyin = fopen(input_path, "r"))) {
+            fprintf(stderr, "[ERR] Open input file %s failed.\n", input_path);
+            exit(1);
+        }
+    } else {
+        yyin = stdin;
+    }
+
+    lines = pos_start = pos_end = 1;
+    gt = new_syntax_tree();
+    yyrestart(yyin);
+    yyparse();
+    return gt;
+}
+
+/// A helper function to quickly construct a tree node.
+///
+/// e.g. $$ = node("program", 1, $1);
+syntax_tree_node *node(const char *name, int children_num, ...)
+{
+    syntax_tree_node *p = new_syntax_tree_node(name);
+    syntax_tree_node *child;
+    // 这里表示 epsilon结点是通过 children_num == 0 来判断的
+    if (children_num == 0) {
+        child = new_syntax_tree_node("epsilon");
+        syntax_tree_add_child(p, child);
+    } else {
+        va_list ap;
+        va_start(ap, children_num);
+        for (int i = 0; i < children_num; ++i) {
+            child = va_arg(ap, syntax_tree_node *);
+            syntax_tree_add_child(p, child);
+        }
+        va_end(ap);
+    }
+    return p;
+}

tests/1-parser/cleanup.sh

+#!/bin/sh
+rm -rf output_student/*
+rm -rf output_student_ast/*

tests/1-parser/eval_phase1.sh

+#!/bin/bash
+
+# DO NOT MODIFY!
+# If you need customized behavior, please create your own script.
+
+function run_tests() {
+    local TESTCASE_DIR=$1
+    local OUTPUT_DIR=$2
+    local OUTPUT_STD_DIR=$3
+    local score=0
+    local total=0
+
+    mkdir -p "$OUTPUT_DIR"
+
+    # 对每个 .cminus 文件生成 syntax_tree 文件
+    for testcase in "$TESTCASE_DIR"/*.cminus; do
+        filename="$(basename "$testcase")"
+
+        echo "[info] Analyzing $filename"
+        
+        # 生成学生的 syntax_tree 文件
+        "$BUILD_DIR"/parser "$testcase" > "$OUTPUT_DIR/${filename%.cminus}.syntax_tree"
+        
+        # 比较当前文件的输出与标准输出
+        if [[ ${2:-no} != "no" ]]; then
+            echo "[info] Comparing $filename..."
+            
+            # 如果是详细模式
+            if [[ ${2:-no} == "verbose" ]]; then
+                diff "$OUTPUT_DIR/${filename%.cminus}.syntax_tree" "$OUTPUT_STD_DIR/${filename%.cminus}.syntax_tree"
+            else
+                diff -q "$OUTPUT_DIR/${filename%.cminus}.syntax_tree" "$OUTPUT_STD_DIR/${filename%.cminus}.syntax_tree"
+            fi
+
+            # 检查 diff 的返回值
+            if [ $? -eq 0 ]; then
+                echo "[info] $filename is correct!"
+                let score=score+1   # 正确时得分+1
+            else
+                echo "[info] $filename differs from the expected output."
+            fi
+        fi
+
+        let total=total+1  # 总文件数+1
+
+        rm -f "$CUR_DIR/${filename%.cminus}"
+    done
+
+    # 输出当前测试集的得分
+    echo "[info] Score for $TESTCASE_DIR: $score/$total"
+    return $score
+}
+
+# 检查命令行参数是否足够
+if [[ $# -lt 1 ]]; then
+    echo "usage: ./eval_phase1.sh   <input> [<summary>]"
+    echo "       <input> can be one of 'easy', 'normal', 'hard', 'testcases_general', or '-all'."
+    echo "       <summary> can be one of 'no', 'yes', and 'verbose'. the default value is 'no'"
+    exit 1
+fi
+
+CUR_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"
+BUILD_DIR="$CUR_DIR/../../build"
+
+# 检查是否使用了 -all 选项
+if [[ $1 == "-all" ]]; then
+    TOTAL_SCORE=0
+    TOTAL_FILES=0
+    # 定义四个测试集
+    TESTCASES=("easy" "normal" "hard" "testcases_general")
+
+    for TESTCASE in "${TESTCASES[@]}"; do
+        if [[ $TESTCASE == "testcases_general" ]]; then
+            TESTCASE_DIR="$CUR_DIR/../$TESTCASE"
+        else
+            TESTCASE_DIR="$CUR_DIR/input/$TESTCASE"
+        fi
+        OUTPUT_DIR="$CUR_DIR/output_student/$TESTCASE"
+        OUTPUT_STD_DIR="$CUR_DIR/output_standard/$TESTCASE"
+
+        # 计算有效文件数
+        VALID_FILES=$(find "$TESTCASE_DIR" -maxdepth 1 -name '*.cminus' | wc -l)
+        echo "[info] Found $VALID_FILES valid files in $TESTCASE_DIR"
+
+        run_tests "$TESTCASE_DIR" "$OUTPUT_DIR" "$OUTPUT_STD_DIR" $2
+        CURRENT_SCORE=$?
+
+        let TOTAL_SCORE+=CURRENT_SCORE
+        TOTAL_FILES=$(($TOTAL_FILES + $VALID_FILES))
+    done
+
+    # 输出总分
+    echo "[info] Total score for all testcases: $TOTAL_SCORE/$TOTAL_FILES"
+
+else
+    # 单个测试集处理
+    TESTCASE="$1"
+    if [[ $TESTCASE == "easy" || $TESTCASE == "normal" || $TESTCASE == "hard" ]]; then
+        TESTCASE_DIR="$CUR_DIR/input/$TESTCASE"
+    elif [[ $TESTCASE == "testcases_general" ]]; then
+        TESTCASE_DIR="$CUR_DIR/../$TESTCASE"
+    fi
+
+    OUTPUT_DIR="$CUR_DIR/output_student/$TESTCASE"
+    OUTPUT_STD_DIR="$CUR_DIR/output_standard/$TESTCASE"
+
+    # 运行单个测试集
+    run_tests "$TESTCASE_DIR" "$OUTPUT_DIR" "$OUTPUT_STD_DIR" $2
+fi
\ No newline at end of file

tests/1-parser/eval_phase2.sh

+#!/bin/bash
+
+# DO NOT MODIFY!
+# If you need customized behavior, please create your own script.
+
+function run_tests() {
+    local TESTCASE_DIR=$1
+    local OUTPUT_DIR=$2
+    local OUTPUT_STD_DIR=$3
+    local score=0
+    local total=0
+
+    mkdir -p "$OUTPUT_DIR"
+
+    # 对每个 .cminus 文件生成 ast 文件
+    for testcase in "$TESTCASE_DIR"/*.cminus; do
+        filename="$(basename "$testcase")"
+
+        # 检查文件名是否以 FAIL 开头，跳过该文件
+        if [[ "$filename" == FAIL* ]]; then
+            echo "[info] Skipping $filename (starts with FAIL)"
+            continue
+        fi
+
+        echo "[info] Analyzing $filename"
+        
+        # 生成学生的 AST 文件
+        "$BUILD_DIR"/cminusfc "$testcase" > "$OUTPUT_DIR/${filename%.cminus}.ast"
+        
+        # 比较当前文件的输出与标准输出
+        if [[ ${2:-no} != "no" ]]; then
+            echo "[info] Comparing $filename..."
+            
+            # 如果是详细模式
+            if [[ ${2:-no} == "verbose" ]]; then
+                diff "$OUTPUT_DIR/${filename%.cminus}.ast" "$OUTPUT_STD_DIR/${filename%.cminus}.ast"
+            else
+                diff -q "$OUTPUT_DIR/${filename%.cminus}.ast" "$OUTPUT_STD_DIR/${filename%.cminus}.ast"
+            fi
+
+            # 检查 diff 的返回值
+            if [ $? -eq 0 ]; then
+                echo "[info] $filename is correct!"
+                let score=score+1   # 正确时得分+1
+            else
+                echo "[info] $filename differs from the expected output."
+            fi
+        fi
+
+        let total=total+1  # 总文件数+1
+
+        rm -f "$CUR_DIR/${filename%.cminus}"
+    done
+
+    # 输出当前测试集的得分
+    echo "[info] Score for $TESTCASE_DIR: $score/$total"
+    return $score
+}
+
+# 检查命令行参数是否足够
+if [[ $# -lt 1 ]]; then
+    echo "usage: ./eval_phase2.sh   <input> [<summary>]"
+    echo "       <input> can be one of 'easy', 'normal', 'hard', 'testcases_general', or '-all'."
+    echo "       <summary> can be one of 'no', 'yes', and 'verbose'. the default value is 'no'"
+    exit 1
+fi
+
+CUR_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"
+BUILD_DIR="$CUR_DIR/../../build"
+
+# 检查是否使用了 -all 选项
+if [[ $1 == "-all" ]]; then
+    TOTAL_SCORE=0
+    TOTAL_FILES=0
+    # 定义四个测试集
+    TESTCASES=("easy" "normal" "hard" "testcases_general")
+
+    for TESTCASE in "${TESTCASES[@]}"; do
+        if [[ $TESTCASE == "testcases_general" ]]; then
+            TESTCASE_DIR="$CUR_DIR/../$TESTCASE"
+        else
+            TESTCASE_DIR="$CUR_DIR/input/$TESTCASE"
+        fi
+        OUTPUT_DIR="$CUR_DIR/output_student_ast/$TESTCASE"
+        OUTPUT_STD_DIR="$CUR_DIR/output_standard_ast/$TESTCASE"
+
+        # 计算有效文件数，跳过以 FAIL 开头的文件
+        VALID_FILES=$(find "$TESTCASE_DIR" -maxdepth 1 -name '*.cminus' ! -name 'FAIL*' | wc -l)
+        echo "[info] Found $VALID_FILES valid files in $TESTCASE_DIR"
+
+        # 运行测试集并跳过以 FAIL 开头的文件
+        run_tests "$TESTCASE_DIR" "$OUTPUT_DIR" "$OUTPUT_STD_DIR" $2
+        CURRENT_SCORE=$?
+
+        let TOTAL_SCORE+=CURRENT_SCORE
+        TOTAL_FILES=$(($TOTAL_FILES + $VALID_FILES))
+    done
+
+    # 输出总分
+    echo "[info] Total score for all testcases: $TOTAL_SCORE/$TOTAL_FILES"
+
+else
+    # 单个测试集处理
+    TESTCASE="$1"
+    if [[ $TESTCASE == "easy" || $TESTCASE == "normal" || $TESTCASE == "hard" ]]; then
+        TESTCASE_DIR="$CUR_DIR/input/$TESTCASE"
+    elif [[ $TESTCASE == "testcases_general" ]]; then
+        TESTCASE_DIR="$CUR_DIR/../$TESTCASE"
+    fi
+
+    OUTPUT_DIR="$CUR_DIR/output_student_ast/$TESTCASE"
+    OUTPUT_STD_DIR="$CUR_DIR/output_standard_ast/$TESTCASE"
+
+    # 运行单个测试集
+    run_tests "$TESTCASE_DIR" "$OUTPUT_DIR" "$OUTPUT_STD_DIR" $2
+fi
\ No newline at end of file

tests/1-parser/input/easy/FAIL_comment.cminus

+/* unclosed comment
\ No newline at end of file

tests/1-parser/input/easy/FAIL_comment2.cminus

+// cminus dont support comment like that
+
+int main(void){
+    return 0;
+}
\ No newline at end of file

tests/1-parser/input/easy/FAIL_function.cminus

+/* unclosed function */
+int main(void)
+{
\ No newline at end of file

tests/1-parser/input/easy/FAIL_id.cminus

+int a1;
+int f1(void) {}
+int f2(void) {}

tests/1-parser/input/easy/expr.cminus

+/*Basic num part*/
+int main(void){
+    a = 0;
+
+    x = 0.0;
+    x = 1.;
+    x = .1;
+
+    a = 1+1;
+    a = a-1;
+
+    x = x*1;
+    x = a/x;
+
+    return 0;
+}
\ No newline at end of file

tests/1-parser/input/easy/id.cminus

+int a;
+int f(void) {}
+int g(void) {}

tests/1-parser/input/hard/You_Should_Pass.cminus

+/*
+    I konw it's weird, even stupid, to code C like this. w(ﾟДﾟ)w
+    HOWEVER, we have to use some tricky cases to test your answer.
+*/
+
+float GVAR;
+void NeverEverDeclareLikeThis;
+int GARRAY[2333];
+
+void MyFuncA(int floatNum, float intNum, void voidNums[]){
+    int IKnowYouAreVoid;
+    return MyFuncB(IKnowYouAreVoid);
+}
+
+float MyFuncB(void){
+    int IAmVoid[0];
+    return MyFuncA(.0, 0, IAmVoid);
+}
+
+int main(void){
+
+    int a; int b; int c;
+
+    a = b = c = (85 == 84 + 0.4);
+
+    if(a = b){
+        GARRAY[ ( MyFuncB() ) ] = GARRAY[c = 1.*.1 == 1.1];
+    }else if (MyFuncC(NotDeclared)){
+
+    }else;
+
+    return 0.;
+}
\ No newline at end of file

tests/1-parser/input/hard/assoc.cminus

+/* associativity and precedence */
+int main(void)
+{
+  a = b = c = 1 + 1 / 2 * 1 * (1 + 1 + 1 - 1 / 1) + 3 + 4 * 3;
+}

tests/1-parser/input/hard/gcd.cminus

+int gcd (int u, int v) { /* calculate the gcd of u and v */
+    if (v == 0) return u;
+    else return gcd(v, u - u / v * v); /* v,u-u/v*v is equals to u mod v*/
+}
+int main(void) {
+        int x; int y; int temp;
+    x = 72;
+        y = 18;
+    if (x<y) {
+        temp = x;
+        x = y;
+        y = temp;
+    }
+    gcd(x,y);
+    return 0;
+}

tests/1-parser/input/hard/hanoi.cminus

+void move(int x, int y)
+{
+    putint(x); putch(32); putint(y); putch(44); putch(32);
+}
+
+void hanoi(int n, int one, int two, int three)
+{
+    if (n == 1)
+        move(one, three);
+    else {
+        hanoi(n - 1, one, three, two);
+        move(one, three);
+        hanoi(n - 1, two, one, three);
+    }
+}
+
+int main(void )
+{
+    int n;
+    n = getint();
+    while (n > 0) {
+        hanoi(getint(), 1, 2, 3);
+        putch(10);
+        n = n - 1;
+    }
+    return 0;
+}

tests/1-parser/input/hard/if.cminus

+/* else should be bound to the closest if */
+int main(void)
+{
+  if (1) {} else if (2) {} else {}
+  return 0;
+}

tests/1-parser/input/hard/selectionsort.cminus

+/* this is the sample program in C- in the book "Compiler Construction" */
+/* A program to perform selection sort on a 10 element array. */
+int x[10];
+int minloc ( int a[], int low, int high )
+{ int i; int x; int k;
+  k = low;
+  x = a[low];
+  i = low + 1;
+  while (i < high)
+    { if (a[i] < x)
+      { x = a[i];
+        k = i; }
+      i = i + 1;
+     }
+  return k;
+ }
+
+ void sort( int a[], int low, int high)
+ { int i; int k;
+   i = low;
+   while ( i < high-1)
+   { int t;
+     k = minloc(a, i, high);
+     t = a[k];
+     a[k] = a[i];
+     a[i] = t;
+     i = i + 1;
+  }
+ }
+
+ void main(void)
+ {  int i;
+   i = 0;
+   while ( i < 10)
+     {  x[i] = input();
+       i = i + 1; }
+   sort(x, 0, 10);
+   i = 0;
+   while (i < 10)
+     { output(x[i]);
+       i = i + 1; }
+ }

tests/1-parser/input/normal/FAIL_assign.cminus

+int main(void)
+{
+  a=1;
+  1=a;
+}

tests/1-parser/input/normal/FAIL_local-decl.cminus

+int main(void){
+    int a;
+    a = 1;
+    int b;
+    return 0;
+}
\ No newline at end of file

tests/1-parser/input/normal/array.cminus

+int main(void) {
+	int array[1];
+	array[1] = 0;
+	return 0;
+}

tests/1-parser/input/normal/func.cminus

+float foo(float a, float b[]) {
+	return 1;
+}
+
+int main(void) {
+	return 0;
+}

tests/1-parser/input/normal/if.cminus

+/*Basic selection part*/
+
+int main(void){
+    int a; int b;
+
+    a = 1;
+    b = 1;
+
+    if(a != b){
+        if(a == b);
+        else{
+            a = b;
+        }
+    }
+
+    return 0;
+}
\ No newline at end of file

tests/1-parser/input/normal/local-decl.cminus

+int main(void) {
+	int i; float j;
+	void v;
+	return 0;
+}

tests/1-parser/input/normal/skip_spaces.cminus

+/*
+
+int main() {
+  int arr[100];
+  int i;
+  int sum;
+  i = 0;
+  sum = 0;
+  while (getint()) {
+  	arr[i] = getint();
+    i = i + 1;
+  }*/
+int main(void) {
+  int arr[100];
+  int i;
+  int sum;
+  i = 0;
+  sum = 0;
+  while (getint()) {
+  	arr[i] = getint();
+    i = i + 1;
+  }
+	while (i) {
+    i = i - 1;
+    sum = sum + arr[i];
+  }
+  return sum - 79;
+}

tests/1-parser/output_standard/easy/expr.syntax_tree

+>--+ program
+|  >--+ declaration-list
+|  |  >--+ declaration
+|  |  |  >--+ fun-declaration
+|  |  |  |  >--+ type-specifier
+|  |  |  |  |  >--* int
+|  |  |  |  >--* main
+|  |  |  |  >--* (
+|  |  |  |  >--+ params
+|  |  |  |  |  >--* void
+|  |  |  |  >--* )
+|  |  |  |  >--+ compound-stmt
+|  |  |  |  |  >--* {
+|  |  |  |  |  >--+ local-declarations
+|  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ expression-stmt
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ var
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* a
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* =
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 0
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ expression-stmt
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ var
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* x
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* =
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ float
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 0.0
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ expression-stmt
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ var
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* x
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* =
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ float
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 1.
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  |  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ expression-stmt
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ var
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* x
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* =
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ float
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* .1
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  |  |  |  |  >--+ expression-stmt
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ var
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* a
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--* =
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 1
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ addop
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* +
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 1
+|  |  |  |  |  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  |  |  |  >--+ expression-stmt
+|  |  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ var
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--* a
+|  |  |  |  |  |  |  |  |  |  |  |  >--* =
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ var
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* a
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ addop
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* -
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 1
+|  |  |  |  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  |  |  >--+ expression-stmt
+|  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  >--+ var
+|  |  |  |  |  |  |  |  |  |  |  |  >--* x
+|  |  |  |  |  |  |  |  |  |  |  >--* =
+|  |  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ var
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* x
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ mulop
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* *
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 1
+|  |  |  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  |  >--+ expression-stmt
+|  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  >--+ var
+|  |  |  |  |  |  |  |  |  |  |  >--* x
+|  |  |  |  |  |  |  |  |  |  >--* =
+|  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ var
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* a
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ mulop
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* /
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ var
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* x
+|  |  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  >--+ return-stmt
+|  |  |  |  |  |  |  |  >--* return
+|  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 0
+|  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  >--* }

tests/1-parser/output_standard/easy/id.syntax_tree

+>--+ program
+|  >--+ declaration-list
+|  |  >--+ declaration-list
+|  |  |  >--+ declaration-list
+|  |  |  |  >--+ declaration
+|  |  |  |  |  >--+ var-declaration
+|  |  |  |  |  |  >--+ type-specifier
+|  |  |  |  |  |  |  >--* int
+|  |  |  |  |  |  >--* a
+|  |  |  |  |  |  >--* ;
+|  |  |  >--+ declaration
+|  |  |  |  >--+ fun-declaration
+|  |  |  |  |  >--+ type-specifier
+|  |  |  |  |  |  >--* int
+|  |  |  |  |  >--* f
+|  |  |  |  |  >--* (
+|  |  |  |  |  >--+ params
+|  |  |  |  |  |  >--* void
+|  |  |  |  |  >--* )
+|  |  |  |  |  >--+ compound-stmt
+|  |  |  |  |  |  >--* {
+|  |  |  |  |  |  >--+ local-declarations
+|  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  >--* }
+|  |  >--+ declaration
+|  |  |  >--+ fun-declaration
+|  |  |  |  >--+ type-specifier
+|  |  |  |  |  >--* int
+|  |  |  |  >--* g
+|  |  |  |  >--* (
+|  |  |  |  >--+ params
+|  |  |  |  |  >--* void
+|  |  |  |  >--* )
+|  |  |  |  >--+ compound-stmt
+|  |  |  |  |  >--* {
+|  |  |  |  |  >--+ local-declarations
+|  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  >--* }

tests/1-parser/output_standard/hard/assoc.syntax_tree

+>--+ program
+|  >--+ declaration-list
+|  |  >--+ declaration
+|  |  |  >--+ fun-declaration
+|  |  |  |  >--+ type-specifier
+|  |  |  |  |  >--* int
+|  |  |  |  >--* main
+|  |  |  |  >--* (
+|  |  |  |  >--+ params
+|  |  |  |  |  >--* void
+|  |  |  |  >--* )
+|  |  |  |  >--+ compound-stmt
+|  |  |  |  |  >--* {
+|  |  |  |  |  >--+ local-declarations
+|  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  >--+ expression-stmt
+|  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  >--+ var
+|  |  |  |  |  |  |  |  |  |  >--* a
+|  |  |  |  |  |  |  |  |  >--* =
+|  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  >--+ var
+|  |  |  |  |  |  |  |  |  |  |  >--* b
+|  |  |  |  |  |  |  |  |  |  >--* =
+|  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  >--+ var
+|  |  |  |  |  |  |  |  |  |  |  |  >--* c
+|  |  |  |  |  |  |  |  |  |  |  >--* =
+|  |  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 1
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ addop
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* +
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 1
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ mulop
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* /
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 2
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ mulop
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* *
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 1
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ mulop
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* *
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* (
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 1
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ addop
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* +
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 1
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ addop
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* +
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 1
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ addop
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* -
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 1
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ mulop
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* /
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 1
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* )
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ addop
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* +
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 3
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ addop
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* +
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 4
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ mulop
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* *
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 3
+|  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  >--* }

tests/1-parser/output_standard/hard/if.syntax_tree

+>--+ program
+|  >--+ declaration-list
+|  |  >--+ declaration
+|  |  |  >--+ fun-declaration
+|  |  |  |  >--+ type-specifier
+|  |  |  |  |  >--* int
+|  |  |  |  >--* main
+|  |  |  |  >--* (
+|  |  |  |  >--+ params
+|  |  |  |  |  >--* void
+|  |  |  |  >--* )
+|  |  |  |  >--+ compound-stmt
+|  |  |  |  |  >--* {
+|  |  |  |  |  >--+ local-declarations
+|  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  |  >--+ selection-stmt
+|  |  |  |  |  |  |  |  |  >--* if
+|  |  |  |  |  |  |  |  |  >--* (
+|  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 1
+|  |  |  |  |  |  |  |  |  >--* )
+|  |  |  |  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  |  |  |  >--+ compound-stmt
+|  |  |  |  |  |  |  |  |  |  |  >--* {
+|  |  |  |  |  |  |  |  |  |  |  >--+ local-declarations
+|  |  |  |  |  |  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  |  |  |  |  |  >--* }
+|  |  |  |  |  |  |  |  |  >--* else
+|  |  |  |  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  |  |  |  >--+ selection-stmt
+|  |  |  |  |  |  |  |  |  |  |  >--* if
+|  |  |  |  |  |  |  |  |  |  |  >--* (
+|  |  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 2
+|  |  |  |  |  |  |  |  |  |  |  >--* )
+|  |  |  |  |  |  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ compound-stmt
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--* {
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ local-declarations
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--* }
+|  |  |  |  |  |  |  |  |  |  |  >--* else
+|  |  |  |  |  |  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ compound-stmt
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--* {
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ local-declarations
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--* }
+|  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  >--+ return-stmt
+|  |  |  |  |  |  |  |  >--* return
+|  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 0
+|  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  >--* }

tests/1-parser/output_standard/normal/array.syntax_tree

+>--+ program
+|  >--+ declaration-list
+|  |  >--+ declaration
+|  |  |  >--+ fun-declaration
+|  |  |  |  >--+ type-specifier
+|  |  |  |  |  >--* int
+|  |  |  |  >--* main
+|  |  |  |  >--* (
+|  |  |  |  >--+ params
+|  |  |  |  |  >--* void
+|  |  |  |  >--* )
+|  |  |  |  >--+ compound-stmt
+|  |  |  |  |  >--* {
+|  |  |  |  |  >--+ local-declarations
+|  |  |  |  |  |  >--+ local-declarations
+|  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  >--+ var-declaration
+|  |  |  |  |  |  |  >--+ type-specifier
+|  |  |  |  |  |  |  |  >--* int
+|  |  |  |  |  |  |  >--* array
+|  |  |  |  |  |  |  >--* [
+|  |  |  |  |  |  |  >--* 1
+|  |  |  |  |  |  |  >--* ]
+|  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  |  >--+ expression-stmt
+|  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  >--+ var
+|  |  |  |  |  |  |  |  |  |  |  >--* array
+|  |  |  |  |  |  |  |  |  |  |  >--* [
+|  |  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 1
+|  |  |  |  |  |  |  |  |  |  |  >--* ]
+|  |  |  |  |  |  |  |  |  |  >--* =
+|  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 0
+|  |  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  >--+ return-stmt
+|  |  |  |  |  |  |  |  >--* return
+|  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 0
+|  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  >--* }

tests/1-parser/output_standard/normal/func.syntax_tree

+>--+ program
+|  >--+ declaration-list
+|  |  >--+ declaration-list
+|  |  |  >--+ declaration
+|  |  |  |  >--+ fun-declaration
+|  |  |  |  |  >--+ type-specifier
+|  |  |  |  |  |  >--* float
+|  |  |  |  |  >--* foo
+|  |  |  |  |  >--* (
+|  |  |  |  |  >--+ params
+|  |  |  |  |  |  >--+ param-list
+|  |  |  |  |  |  |  >--+ param-list
+|  |  |  |  |  |  |  |  >--+ param
+|  |  |  |  |  |  |  |  |  >--+ type-specifier
+|  |  |  |  |  |  |  |  |  |  >--* float
+|  |  |  |  |  |  |  |  |  >--* a
+|  |  |  |  |  |  |  >--* ,
+|  |  |  |  |  |  |  >--+ param
+|  |  |  |  |  |  |  |  >--+ type-specifier
+|  |  |  |  |  |  |  |  |  >--* float
+|  |  |  |  |  |  |  |  >--* b
+|  |  |  |  |  |  |  |  >--* [
+|  |  |  |  |  |  |  |  >--* ]
+|  |  |  |  |  >--* )
+|  |  |  |  |  >--+ compound-stmt
+|  |  |  |  |  |  >--* {
+|  |  |  |  |  |  >--+ local-declarations
+|  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  |  >--+ return-stmt
+|  |  |  |  |  |  |  |  |  >--* return
+|  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 1
+|  |  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  |  >--* }
+|  |  >--+ declaration
+|  |  |  >--+ fun-declaration
+|  |  |  |  >--+ type-specifier
+|  |  |  |  |  >--* int
+|  |  |  |  >--* main
+|  |  |  |  >--* (
+|  |  |  |  >--+ params
+|  |  |  |  |  >--* void
+|  |  |  |  >--* )
+|  |  |  |  >--+ compound-stmt
+|  |  |  |  |  >--* {
+|  |  |  |  |  >--+ local-declarations
+|  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  >--+ return-stmt
+|  |  |  |  |  |  |  |  >--* return
+|  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 0
+|  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  >--* }

tests/1-parser/output_standard/normal/if.syntax_tree

+>--+ program
+|  >--+ declaration-list
+|  |  >--+ declaration
+|  |  |  >--+ fun-declaration
+|  |  |  |  >--+ type-specifier
+|  |  |  |  |  >--* int
+|  |  |  |  >--* main
+|  |  |  |  >--* (
+|  |  |  |  >--+ params
+|  |  |  |  |  >--* void
+|  |  |  |  >--* )
+|  |  |  |  >--+ compound-stmt
+|  |  |  |  |  >--* {
+|  |  |  |  |  >--+ local-declarations
+|  |  |  |  |  |  >--+ local-declarations
+|  |  |  |  |  |  |  >--+ local-declarations
+|  |  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  |  >--+ var-declaration
+|  |  |  |  |  |  |  |  >--+ type-specifier
+|  |  |  |  |  |  |  |  |  >--* int
+|  |  |  |  |  |  |  |  >--* a
+|  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  |  >--+ var-declaration
+|  |  |  |  |  |  |  >--+ type-specifier
+|  |  |  |  |  |  |  |  >--* int
+|  |  |  |  |  |  |  >--* b
+|  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  |  |  |  >--+ expression-stmt
+|  |  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ var
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--* a
+|  |  |  |  |  |  |  |  |  |  |  |  >--* =
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 1
+|  |  |  |  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  |  |  >--+ expression-stmt
+|  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  >--+ var
+|  |  |  |  |  |  |  |  |  |  |  |  >--* b
+|  |  |  |  |  |  |  |  |  |  |  >--* =
+|  |  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 1
+|  |  |  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  |  >--+ selection-stmt
+|  |  |  |  |  |  |  |  |  >--* if
+|  |  |  |  |  |  |  |  |  >--* (
+|  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ var
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* a
+|  |  |  |  |  |  |  |  |  |  |  >--+ relop
+|  |  |  |  |  |  |  |  |  |  |  |  >--* !=
+|  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ var
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* b
+|  |  |  |  |  |  |  |  |  >--* )
+|  |  |  |  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  |  |  |  >--+ compound-stmt
+|  |  |  |  |  |  |  |  |  |  |  >--* {
+|  |  |  |  |  |  |  |  |  |  |  >--+ local-declarations
+|  |  |  |  |  |  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ selection-stmt
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* if
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* (
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ var
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* a
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ relop
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* ==
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ var
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* b
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* )
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ expression-stmt
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* else
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ compound-stmt
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* {
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ local-declarations
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ expression-stmt
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ var
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* a
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* =
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ var
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* b
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* }
+|  |  |  |  |  |  |  |  |  |  |  >--* }
+|  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  >--+ return-stmt
+|  |  |  |  |  |  |  |  >--* return
+|  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 0
+|  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  >--* }

tests/1-parser/output_standard/normal/local-decl.syntax_tree

+>--+ program
+|  >--+ declaration-list
+|  |  >--+ declaration
+|  |  |  >--+ fun-declaration
+|  |  |  |  >--+ type-specifier
+|  |  |  |  |  >--* int
+|  |  |  |  >--* main
+|  |  |  |  >--* (
+|  |  |  |  >--+ params
+|  |  |  |  |  >--* void
+|  |  |  |  >--* )
+|  |  |  |  >--+ compound-stmt
+|  |  |  |  |  >--* {
+|  |  |  |  |  >--+ local-declarations
+|  |  |  |  |  |  >--+ local-declarations
+|  |  |  |  |  |  |  >--+ local-declarations
+|  |  |  |  |  |  |  |  >--+ local-declarations
+|  |  |  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  |  |  >--+ var-declaration
+|  |  |  |  |  |  |  |  |  >--+ type-specifier
+|  |  |  |  |  |  |  |  |  |  >--* int
+|  |  |  |  |  |  |  |  |  >--* i
+|  |  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  |  |  >--+ var-declaration
+|  |  |  |  |  |  |  |  >--+ type-specifier
+|  |  |  |  |  |  |  |  |  >--* float
+|  |  |  |  |  |  |  |  >--* j
+|  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  |  >--+ var-declaration
+|  |  |  |  |  |  |  >--+ type-specifier
+|  |  |  |  |  |  |  |  >--* void
+|  |  |  |  |  |  |  >--* v
+|  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  >--+ return-stmt
+|  |  |  |  |  |  |  |  >--* return
+|  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 0
+|  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  >--* }

tests/1-parser/output_standard/testcases_general/1-return.syntax_tree

+>--+ program
+|  >--+ declaration-list
+|  |  >--+ declaration
+|  |  |  >--+ fun-declaration
+|  |  |  |  >--+ type-specifier
+|  |  |  |  |  >--* void
+|  |  |  |  >--* main
+|  |  |  |  >--* (
+|  |  |  |  >--+ params
+|  |  |  |  |  >--* void
+|  |  |  |  >--* )
+|  |  |  |  >--+ compound-stmt
+|  |  |  |  |  >--* {
+|  |  |  |  |  >--+ local-declarations
+|  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  >--+ return-stmt
+|  |  |  |  |  |  |  |  >--* return
+|  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  >--* }

tests/1-parser/output_standard/testcases_general/10-funcall.syntax_tree

+>--+ program
+|  >--+ declaration-list
+|  |  >--+ declaration-list
+|  |  |  >--+ declaration
+|  |  |  |  >--+ fun-declaration
+|  |  |  |  |  >--+ type-specifier
+|  |  |  |  |  |  >--* void
+|  |  |  |  |  >--* test
+|  |  |  |  |  >--* (
+|  |  |  |  |  >--+ params
+|  |  |  |  |  |  >--+ param-list
+|  |  |  |  |  |  |  >--+ param
+|  |  |  |  |  |  |  |  >--+ type-specifier
+|  |  |  |  |  |  |  |  |  >--* int
+|  |  |  |  |  |  |  |  >--* a
+|  |  |  |  |  >--* )
+|  |  |  |  |  >--+ compound-stmt
+|  |  |  |  |  |  >--* {
+|  |  |  |  |  |  >--+ local-declarations
+|  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  |  >--+ return-stmt
+|  |  |  |  |  |  |  |  |  >--* return
+|  |  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  |  >--* }
+|  |  >--+ declaration
+|  |  |  >--+ fun-declaration
+|  |  |  |  >--+ type-specifier
+|  |  |  |  |  >--* void
+|  |  |  |  >--* main
+|  |  |  |  >--* (
+|  |  |  |  >--+ params
+|  |  |  |  |  >--* void
+|  |  |  |  >--* )
+|  |  |  |  >--+ compound-stmt
+|  |  |  |  |  >--* {
+|  |  |  |  |  >--+ local-declarations
+|  |  |  |  |  |  >--+ local-declarations
+|  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  >--+ var-declaration
+|  |  |  |  |  |  |  >--+ type-specifier
+|  |  |  |  |  |  |  |  >--* int
+|  |  |  |  |  |  |  >--* a
+|  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  |  |  >--+ expression-stmt
+|  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  >--+ var
+|  |  |  |  |  |  |  |  |  |  |  |  >--* a
+|  |  |  |  |  |  |  |  |  |  |  >--* =
+|  |  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ integer
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* 10
+|  |  |  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  |  >--+ expression-stmt
+|  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ call
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* test
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* (
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ args
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ arg-list
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ simple-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ additive-expression
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ term
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ factor
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--+ var
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* a
+|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  >--* )
+|  |  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  >--+ return-stmt
+|  |  |  |  |  |  |  |  >--* return
+|  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  >--* }

tests/1-parser/output_standard/testcases_general/21-comment.syntax_tree

+>--+ program
+|  >--+ declaration-list
+|  |  >--+ declaration
+|  |  |  >--+ fun-declaration
+|  |  |  |  >--+ type-specifier
+|  |  |  |  |  >--* void
+|  |  |  |  >--* main
+|  |  |  |  >--* (
+|  |  |  |  >--+ params
+|  |  |  |  |  >--* void
+|  |  |  |  >--* )
+|  |  |  |  >--+ compound-stmt
+|  |  |  |  |  >--* {
+|  |  |  |  |  >--+ local-declarations
+|  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  >--+ statement-list
+|  |  |  |  |  |  |  >--* epsilon
+|  |  |  |  |  |  >--+ statement
+|  |  |  |  |  |  |  >--+ return-stmt
+|  |  |  |  |  |  |  |  >--* return
+|  |  |  |  |  |  |  |  >--* ;
+|  |  |  |  |  >--* }