Facepunch.Parse
Context-free grammar parsing tool
Example
Parser
var grammar = GrammarBuilder.FromString( @"
Whitespace = /\s+/;
Word = /[a-z]+/i;
Period = '.' | '?' | '!';
EndOfInput = /$/;
ignore Whitespace
{
Document = Sentence (Document | EndOfInput);
Sentence = Word (Sentence | Period);
}
" );
var result = grammar["Document"].Parse(File.ReadAllText(args[0]));
Console.WriteLine(result.ToXElement());Input
Hello world! How are you? Testing-testing testing testing.
Output
Error: Expected Word, '.', '?', or '!' at line 1, column 34
<Document index="0" length="33">
<Sentence index="0" length="13">
<Word index="0" length="5">Hello</Word>
<Word index="6" length="5">world</Word>
<Period index="11" length="1">!</Period>
</Sentence>
<Sentence index="13" length="13">
<Word index="13" length="3">How</Word>
<Word index="17" length="3">are</Word>
<Word index="21" length="3">you</Word>
<Period index="24" length="1">?</Period>
</Sentence>
<Sentence index="26" length="7">
<Word index="26" length="7">Testing</Word>
<Word index="33" length="0">
<ParseError>Expected Word</ParseError>
</Word>
<Period index="33" length="0">
<Token index="33" length="0">
<ParseError>Expected '.'</ParseError>
</Token>
<Token index="33" length="0">
<ParseError>Expected '?'</ParseError>
</Token>
<Token index="33" length="0">
<ParseError>Expected '!'</ParseError>
</Token>
</Period>
</Sentence>
</Document>
