public void BnfToCode()
{
// roundtrip to generated code then back again
var bnfParser = new BnfGrammar();
// generate code from bnf
var code = bnfParser.ToCode(postalAddressBnf, "postal-address", "PostalGrammar");
// execute the code and test
var addressParser = Helper.Create<Grammar>(code, "PostalGrammar");
TestAddress(addressParser);
}
private static string GetCode(CommandLineOptions opts)
{
switch (Path.GetExtension(opts.GrammarFile)) {
case ".bnf":
var gr = new BnfGrammar();
return gr.ToCode(File.ReadAllText(opts.GrammarFile), opts.StartParser, opts.GrammarName);
case ".ebnf":
var egr = new EbnfGrammar(EbnfStyle.W3c | EbnfStyle.SquareBracketAsOptional | EbnfStyle.WhitespaceSeparator);
return egr.ToCode(File.ReadAllText(opts.GrammarFile), opts.StartParser, opts.GrammarName);
case ".gold":
var ggr = new GoldGrammar();
return ggr.ToCode(File.ReadAllText(opts.GrammarFile), opts.GrammarName);
}
throw new Exception("Unknown Grammar. Try .ebnf .bnf .gold");
}
public void BnfParsingSpeed()
{
var bnfParser = new BnfGrammar();
Helper.TestSpeed(bnfParser, postalAddressBnf, speedIterations);
}
public static Grammar GetAddressParser()
{
var bnfParser = new BnfGrammar();
return bnfParser.Build(postalAddressBnf, "postal-address");
}
public void Simple()
{
var grammarString = @"
<ws> ::= <WhiteSpace> <ws>
|
<simple-value> ::= <simple-value> <LetterOrDigit>
| <simple-value>
<bracket-value> ::= <bracket-value> <simple-value>
| <bracket-value>
<optional-bracket> ::= '(' <bracket-value> ')'
| <simple-value>
<first> ::= <optional-bracket>
<second> ::= <optional-bracket>
<grammar> ::= <ws> <first> <second> <ws>
";
var input = " hello ( parsing world ) ";
// our grammar
var grammar = new BnfGrammar().Build(grammarString, "grammar");
var match = grammar.Match(input);
Assert.IsTrue(match.Success);
Assert.AreEqual("hello", match["first"]["simple-value", true].Text);
Assert.AreEqual("parsing world", match["second"]["bracket-value", true].Text);
}
