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/[0-9]+/ { println("An integer:", txt()) }
/[0-9]+\.[0-9]*/ { println("A float:", txt()) }
/if|then|begin|end|procedure|function/
{ println("A keyword:", txt()) }
/[a-z][a-z0-9]*/ { println("An identifier:", txt()) }
/\+|-|\*|\// { println("An operator:", txt()) }
/[ \t\n]+/ { /* eat up whitespace */ }
/./ { println("Unrecognized character:", txt()) }
/{[^\{\}\n]*}/ { /* eat up one-line comments */ }
//
package main
import "os"
func main() {
lex := NewLexer(os.Stdin)
txt := func() string { return lex.Text() }
NN_FUN(lex)
// I changed a regex because the original appears to be wrong:
// "{"[\^{}}\n]*"}" /* eat up one-line comments */
//
// The original has a few other bugs, e.g. a missing '<' before "math.h",
// and a missing noyywrap option prevents compilation.
}
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