%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;
int pos_start;
int pos_end;

void pass_node(char *text){
     yylval.value = new_syntax_tree_node(text);
}

/*****************声明和选项设置  end*****************/

%}

letter [a-zA-Z]
digit [0-9]
ID {letter}+
INTEGER {digit}+
FLOAT {digit}+\. | {digit}*\.{digit}+

/*

%token <node> _IF _ELSE _WHILE _RETURN _INT _FLOAT _VOID 
%token <node> _ASSIGN _RELOP _ADD_OP _MUL_OP
%token <node> _L_SQUARE _R_SQUARE _L_PARE _R_PARE _L_BRACKET _R_BRACKET
%token <node> _SEMI _COMMA _ID _INTEGER _FLOATPOINT

*/

%%
if {pos_start = pos_end; pos_end += 2; pass_node("if"); return _IF;}
else {pos_start = pos_end; pos_end += 4; pass_node("else"); return _ELSE;}
while {pos_start = pos_end; pos_end += 5; pass_node("while"); return _WHILE;}
return {pos_start = pos_end; pos_end += 6; pass_node("return"); return _RETURN;}
int {pos_start = pos_end; pos_end += 3; pass_node("int"); return _INT;}
float {pos_start = pos_end; pos_end += 5; pass_node("float"); return _FLOAT;}
void {pos_start = pos_end; pos_end += 4; pass_node("void"); return _VOID;}

{ID} {pos_start = pos_end; pos_end += yyleng; pass_node(yytext); return _ID;}
{INTEGER} {pos_start = pos_end; pos_end += yyleng; pass_node(yytext); return _INTEGER;}
{FLOAT} {pos_start = pos_end; pos_end += yyleng; pass_node(yytext); return _FLOATPOINT;}

\= 	{pos_start = pos_end; pos_end += 1; pass_node("="); return _ASSIGN;}
"<=" | ">=" | "<" | ">" | "==" | "!=" {pos_start = pos_end; pos_end += yyleng; pass_node(yytext); return _RELOP;}
"+" | "-" {pos_start = pos_end; pos_end += 1; pass_node(yytext); return _ADD_OP;}
"*" | "/" {pos_start = pos_end; pos_end += 1; pass_node(yytext); return _MUL_OP;}

\[ | \] {pos_start = pos_end; pos_end += 1; pass_node(yytext); return yytext[0] == '[' ? _L_SQUARE : _R_SQUARE;}
\( | \) {pos_start = pos_end; pos_end += 1; pass_node(yytext); return yytext[0] == '(' ? _L_PARE : _R_PARE;}
\{ | \} {pos_start = pos_end; pos_end += 1; pass_node(yytext); return yytext[0] == '{' ? _L_BRACKET : _R_BRACKET;}

"," | ";" {pos_start = pos_end; pos_end += 1; pass_node(yytext); return yytext[0] == ',' ? _COMMA : _SEMI;}

" " | \t { pos_end++; }
\r\n | \n | \r { lines++; pos_end = 0;}
/* . { pos_start = pos_end; pos_end++; return ERROR; } */
/****请在此补全所有flex的模式与动作  end******/
%%