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compiler.l
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%{
#include "y.tab.h"
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include "tree.h"
#include "Praser.h"
#include <iostream>
using namespace std;
void count(void);
void comment();
int check_type();
int column = 0;
%}
%option yylineno
D [0-9]
L [a-zA-Z_]
H [a-fA-F0-9]
E ([Ee][+-]?{D}+)
P ([Pp][+-]?{D}+)
FS (f|F|l|L)
IS ((u|U)|(u|U)?(l|L|ll|LL)|(l|L|ll|LL)(u|U))
%%
"/*" { comment();/*注释*/}
"//"[^\n]* { /* consume //-comment */ }
"bool" { count(); yylval.gt =create_tree("BOOL",0,yylineno); return(BOOL); }
"int" { count(); yylval.gt =create_tree("INT",0,yylineno); return(INT); }
"char" { count(); yylval.gt =create_tree("CHAR",0,yylineno); return(CHAR); }
"double" { count(); yylval.gt =create_tree("DOUBLE",0,yylineno); return(DOUBLE); }
"break" { count(); yylval.gt =create_tree("BREAK",0,yylineno); return(BREAK); }
"case" { count(); yylval.gt =create_tree("CASE",0,yylineno); return(CASE); }
"continue" { count(); yylval.gt =create_tree("CONTINUE",0,yylineno); return(CONTINUE); }
"do" { count(); yylval.gt =create_tree("DO",0,yylineno); return(DO); }
"else" { count(); yylval.gt =create_tree("ELSE",0,yylineno); return(ELSE); }
"for" { count(); yylval.gt =create_tree("FOR",0,yylineno); return(FOR); }
"goto" { count(); yylval.gt =create_tree("GOTO",0,yylineno); return(GOTO); }
"if" { count(); yylval.gt =create_tree("IF",0,yylineno); return(IF); }
"return" { count(); yylval.gt =create_tree("RETURN",0,yylineno); return(RETURN); }
"switch" { count(); yylval.gt =create_tree("SWITCH",0,yylineno); return(SWITCH); }
"void" { count(); yylval.gt =create_tree("VOID",0,yylineno); return(VOID); }
"while" { count(); yylval.gt =create_tree("WHILE",0,yylineno); return(WHILE); }
"true" { count(); yylval.gt =create_tree("TRUE",0,yylineno); return(TRUE); }
"false" { count(); yylval.gt =create_tree("FALSE",0,yylineno); return(FALSE); }
{L}({L}|{D})* {count(); yylval.gt =create_tree("IDENTIFIER",0,yylineno); return(check_type());/*IDENTIFIER*/ }
0[xX]{H}+{IS}? { count(); yylval.gt =create_tree("CONSTANT_INT",0,yylineno); return(CONSTANT_INT); /*16进制*/}
0[0-7]*{IS}? { count(); yylval.gt =create_tree("CONSTANT_INT",0,yylineno); return(CONSTANT_INT); /*8进制*/}
[1-9]{D}*{IS}? { count(); yylval.gt =create_tree("CONSTANT_INT",0,yylineno); return(CONSTANT_INT); /*10进制*/}
L?'(\\.|[^\\'\n])+' { count(); return(CONSTANT); }
{D}+{E}{FS}? { count(); yylval.gt =create_tree("CONSTANT_DOUBLE",0,yylineno); return(CONSTANT_DOUBLE); /*浮点数*/}
{D}*"."{D}+{E}?{FS}? { count(); yylval.gt =create_tree("CONSTANT_DOUBLE",0,yylineno); return(CONSTANT_DOUBLE); /*浮点数*/}
{D}+"."{D}*{E}?{FS}? { count(); yylval.gt =create_tree("CONSTANT_DOUBLE",0,yylineno); return(CONSTANT_DOUBLE); /*浮点数*/}
0[xX]{H}+{P}{FS}? { count(); return(CONSTANT); }
0[xX]{H}*"."{H}+{P}?{FS}? { count(); return(CONSTANT); }
0[xX]{H}+"."{H}*{P}?{FS}? { count(); return(CONSTANT); }
L?\"(\\.|[^\\"\n])*\" { count(); yylval.gt =create_tree("STRING_LITERAL",0,yylineno); return(STRING_LITERAL); /*字符串常量*/}
">>=" { count(); yylval.gt =create_tree("RIGHT_ASSIGN",0,yylineno); return(RIGHT_ASSIGN); }
"<<=" { count(); yylval.gt =create_tree("LEFT_ASSIGN",0,yylineno); return(LEFT_ASSIGN); }
"+=" { count(); yylval.gt =create_tree("ADD_ASSIGN",0,yylineno); return(ADD_ASSIGN); }
"-=" { count(); yylval.gt =create_tree("SUB_ASSIGN",0,yylineno); return(SUB_ASSIGN); }
"*=" { count(); yylval.gt =create_tree("MUL_ASSIGN",0,yylineno); return(MUL_ASSIGN); }
"/=" { count(); yylval.gt =create_tree("DIV_ASSIGN",0,yylineno); return(DIV_ASSIGN); }
"%=" { count(); yylval.gt =create_tree("MOD_ASSIGN",0,yylineno); return(MOD_ASSIGN); }
"&=" { count(); yylval.gt =create_tree("AND_ASSIGN",0,yylineno); return(AND_ASSIGN); }
"^=" { count(); yylval.gt =create_tree("XOR_ASSIGN",0,yylineno); return(XOR_ASSIGN); }
"|=" { count(); yylval.gt =create_tree("OR_ASSIGN",0,yylineno); return(OR_ASSIGN); }
">>" { count(); yylval.gt =create_tree("RIGHT_OP",0,yylineno); return(RIGHT_OP); }
"<<" { count(); yylval.gt =create_tree("LEFT_OP",0,yylineno); return(LEFT_OP); }
"++" { count(); yylval.gt =create_tree("INC_OP",0,yylineno); return(INC_OP); }
"--" { count(); yylval.gt =create_tree("DEC_OP",0,yylineno); return(DEC_OP); }
"->" { count(); yylval.gt =create_tree("PTR_OP",0,yylineno); return(PTR_OP); }
"&&" { count(); yylval.gt =create_tree("AND_OP",0,yylineno); return(AND_OP); }
"||" { count(); yylval.gt =create_tree("OR_OP",0,yylineno); return(OR_OP); }
"<=" { count(); yylval.gt =create_tree("LE_OP",0,yylineno); return(LE_OP); }
">=" { count(); yylval.gt =create_tree("GE_OP",0,yylineno); return(GE_OP); }
"==" { count(); yylval.gt =create_tree("EQ_OP",0,yylineno); return(EQ_OP); }
"!=" { count(); yylval.gt =create_tree("NE_OP",0,yylineno); return(NE_OP); }
";" { count(); yylval.gt =create_tree(";",0,yylineno); return(';'); }
"," { count(); yylval.gt =create_tree(",",0,yylineno); return(','); }
":" { count(); yylval.gt =create_tree(":",0,yylineno); return(':'); }
"=" { count(); yylval.gt =create_tree("=",0,yylineno); return('='); }
"[" { count(); yylval.gt =create_tree("[",0,yylineno); return('['); }
"]" { count(); yylval.gt =create_tree("]",0,yylineno); return(']'); }
"." { count(); yylval.gt =create_tree(".",0,yylineno); return('.'); }
"&" { count(); yylval.gt =create_tree("&",0,yylineno); return('&'); }
"!" { count(); yylval.gt =create_tree("!",0,yylineno); return('!'); }
"~" { count(); yylval.gt =create_tree("~",0,yylineno); return('~'); }
"-" { count(); yylval.gt =create_tree("-",0,yylineno); return('-'); }
"+" { count(); yylval.gt =create_tree("+",0,yylineno); return('+'); }
"*" { count(); yylval.gt =create_tree("*",0,yylineno); return('*'); }
"/" { count(); yylval.gt =create_tree("/",0,yylineno); return('/'); }
"%" { count(); yylval.gt =create_tree("%",0,yylineno); return('%'); }
"<" { count(); yylval.gt =create_tree("<",0,yylineno); return('<'); }
">" { count(); yylval.gt =create_tree(">",0,yylineno); return('>'); }
"^" { count(); yylval.gt =create_tree("^",0,yylineno); return('^'); }
"|" { count(); yylval.gt =create_tree("|",0,yylineno); return('|'); }
"?" { count(); yylval.gt =create_tree("?",0,yylineno); return('?'); }
"{" { count(); yylval.gt =create_tree("{",0,yylineno); return('{'); }
"}" { count(); yylval.gt =create_tree("}",0,yylineno); return('}'); }
"(" { count(); yylval.gt =create_tree("(",0,yylineno); return('('); }
")" { count(); yylval.gt =create_tree(")",0,yylineno); return(')'); }
[\t\v\n\f ] { count();}
. { /* Add code to complain about unmatched characters */ }
%%
int yywrap() {
return 1;
}
void comment() {
column = 0;
char c, prev = 0;
while (cin >> c) /* (EOF maps to 0) */
{
if (c == '/' && prev == '*')
return;
prev = c;
}
printf("unterminated comment");
}
void count(void)
{
int i;
for (i = 0; yytext[i] != '\0'; i++)
if (yytext[i] == '\n')
column = 0;
else if (yytext[i] == '\t')
column += 4 - (column % 4);
else
column++;
ECHO;
}
int check_type() {
/*
* pseudo code --- this is what it should check
*
* if (yytext == type_name)
* return TYPE_NAME;
*
* return IDENTIFIER;
*/
/*
* it actually will only return IDENTIFIER
*/
return IDENTIFIER;
}