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translate.l
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%{
#include <stdio.h>
#include <string.h>
extern int yylval;
// enum op{zs, NUMBER, IDENT ,FUNC ,LEFTPA,RIGHTPA ,COMMA ,COLON,EQUA,PLUS ,MINUS,MUL ,DIV,COS ,SIN, LN ,EXP, POW };
%}
/*常规定义*/
letter [A-Za-z]
digit [0-9]
%%
"\n" {
// printf("enter\n");
return EOL;
}
"cos" {
// printf("%s, cos\n",yytext);
return COS;
}
"sin" {
// printf("%s, sin\n",yytext);
return SIN;
}
"ln" {
// printf("%s, ln\n",yytext);
return LN;
}
"exp" {
// printf("%s, exp\n",yytext);
return EXP;
}
"f" {
// printf("%s, function\n",yytext);
return FUNC;
}
"=" {
// printf("%s, equal\n",yytext);
return EQUA;
}
"-" {
// printf("%s, minus\n",yytext);
return MINUS;
}
"+" {
// printf("%s, equal\n",yytext);
return PLUS;
}
"/" {
// printf("%s, divide\n",yytext);
return DIV;
}
"*" {
// printf("%s, multiply\n",yytext);
return MUL;
}
"^" {
// printf("%s, power\n",yytext);
return POW;
}
"(" {
// printf("%s, Lparen\n",yytext);
return LEFTPA;
}
")" {
// printf("%s, Rparen\n",yytext);
return RIGHTPA;
}
":" {
// printf("%s, colon\n",yytext);
return COLON;
}
"," {
// printf("%s, comma\n",yytext);
return COMMA;
}
{letter}({letter}|{digit})* {
// printf("%s,ident\n",yytext);
return IDENT;
}
{digit}+ {
// printf("%s, number\n",yytext);
yylval = atoi(yytext);
return NUMBER;
}
%%
/* int main(){
int sym;
while(1){
sym = yylex();
switch(sym)
{
case COS: printf("COS(\n");
}
}
return 0;
} */