lex.l


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%{
#include "syntax.tab.h"  // Bison 生成的头文件

void yyerror(const char *s);
%}

%option noyywrap

%%

[\t ]+                 { /* Ignore whitespace */ }
"\n"                   { printf("new line\n");return NEWLINE; }
"\\\n"                 { printf("> "); }
">>"                   { return APPEND_OUT; }
"<<"                   { return HEREDOC; }
">"                    { return REDIRECT_OUT; }
"<"                    { return REDIRECT_IN; }
">>&"                  { return APPEND_OUTPUT_ERR; }
">&"                   { return REDIRECT_OUTPUT_ERR; }
"|"                    { return PIPE; }
"&&"                   { return AND; }
"||"                   { return OR; }
"&"                    { return BACKGROUND; }
\"(\\.|[^\"])*\"       { yylval.str = strdup(yytext); return STRING; }
[a-zA-Z0-9_\-\/.]+     { yylval.str = strdup(yytext); return WORD; }


%%

void yyerror(const char *s)
{
    fprintf(stderr, "error: %s\n", s);
}