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/* scanner for a toy JavaScript-like language */
%{
#define YY_NO_UNISTD_H
%}
DIGIT [0-9]
ID [a-z_$][a-z0-9_$]*
STRQ '([^\']|(\\\'))*'
STRDQ "([^\"]|(\\\"))*"
%%
{DIGIT}+ {
printf("<span class=\"number\">%s</span>", yytext);
}
{DIGIT}+"."{DIGIT}* {
printf("<span class=\"number\">%s</span>", yytext);
}
if|else|for|while|do|break|switch|case|function|return|new|delete|try|throw|catch|class|public|private {
printf("<span class=\"keyword\">%s</span>", yytext);
}
{ID} printf("<span class=\"identifier\">%s</span>", yytext);
{STRQ}|{STRDQ} printf("<span class=\"string\">%s</span>", yytext);
"."|"+"|"-"|"*"|"/"|"="|"!"|">"|"<"|"!=="|"==="|">="|"<="|"++"|"--"|"=>" printf("<span class=\"operator\">%s</span>", yytext);
[;(){}:? \t\n]+ printf("%s", yytext); /* echo the rest */
. printf( "Unrecognized character: %s\n", yytext );
%%
int yywrap()
{
return 1;
}
int main(int argc, const char* argv[])
{
++argv, --argc; /* skip over program name */
if ( argc > 0 )
yyin = fopen( argv[0], "r" );
else
yyin = stdin;
puts(
"<!doctype>"
"<html>"
"<head>"
" <title>hello.js</title>"
" <style>"
" .keyword {"
" color: red;"
" }"
" .number {"
" color: blue;"
" }"
" .string {"
" color: green;"
" }"
" .operator {"
" font-style: bold;"
" }"
" </style>"
"</head>"
"<body>"
" <pre class=\"code\">"
);
yylex();
puts("</pre></body></html>");
return 0;
}
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