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shell.l
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116 lines (85 loc) · 999 Bytes
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/*
*
* CS-252
* shell.l: lexical analyzer for shell
* You have to extend it.
*
*/
%{
#include <cstring>
#include "y.tab.hh"
static void yyunput (int c,char *buf_ptr );
void myunputc(int c) {
unput(c);
}
%}
%option noyywrap
%%
"#".*\n {
/* Discard comments starting with # */
}
\n {
return NEWLINE;
}
[ \t] {
/* Discard spaces and tabs */
}
">" {
return GREAT;
}
"<" {
return LESS;
}
"|" {
return PIPE;
}
">>" {
return GREATGREAT;
}
">&" {
return GREATAMPERSAND;
}
">>&" {
return GREATGREATAMPERSAND;
}
"&" {
return AMPERSAND;
}
"[" {
return LBRACKET;
}
"]" {
return RBRACKET;
}
"if" {
return IF;
}
"then" {
return THEN;
}
"fi" {
return FI;
}
"while" {
return WHILE;
}
"do" {
return DO;
}
"done" {
return DONE;
}
"for" {
return FOR;
}
"in" {
return IN;
}
";" {
return SEMI;
}
[^ \t\n;][^ \t\n;]* {
/* Assume that file names have only alpha chars */
yylval.cpp_string = new std::string(yytext);
return WORD;
}