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/* lex.l - lexical analyzer for rail program */
%{
#include <string.h>
#include "rail.h"
#include "gram.h"
unsigned line; /* current input line */
int copy; /* copy to output flag */
#define COPY (copy && fputs(yytext,outf))
extern YYSTYPE yylval;
%}
%%
[a-zA-Z_][0-9a-zA-Z_.]* {
COPY;
yylval.id=lookup(yytext);
return(IDENTIFIER);
}
[0-9][0-9]* {
COPY;
yylval.num=atoi(yytext);
return(NUMBER);
}
\\rail@i {
COPY;
return(RAILI);
}
\\rail@p {
COPY;
return(RAILP);
}
\\rail@t {
COPY;
return(RAILT);
}
\\par {
COPY;
}
\\\\ { COPY;
return(RAILCR);
}
\\[a-zA-Z@]+ {
COPY;
return(CS);
}
\\[^ \n\t] {
COPY;
return(CS);
}
'[^\n\t']*' {
COPY;
yytext[yyleng-1]='\0';
yylval.text=mcheck(strdup(yytext+1));
return(STRING);
}
\[[^\n\t\]]*\] {
COPY;
yytext[yyleng-1]='\0';
yylval.text=mcheck(strdup(yytext+1));
return(ANNOT);
}
\"[^\n\t\"]*\" {
COPY;
yytext[yyleng-1]='\0';
yylval.text=mcheck(strdup(yytext+1));
return(STRING);
}
[ \t]+ {
COPY;
}
\n {
COPY;
line++;
}
. {
COPY;
return(yytext[0]);
}
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