Question

I am trying to parse a really small subset of HTML markup.

PKSequence *parrser = [PKSequence sequence];
[parrser add:[PKSymbol symbolWithString:@"<title>"]];   
PKWord *word = [PKWord word];
[word setAssembler:self selector:@selector(workOnWordAssembly:)];
[parrser add:word];
[parrser add:[PKSymbol symbolWithString:@"</title>"]];

PKAssembly *result = [parrser bestMatchFor:[PKTokenAssembly assemblyWithString:@"<title>teeest</title>"]];


-(void)workOnWordAssembly:(PKAssembly *)a {
        NSLog(@"We entered this");
}

but workOnWordAssembly is not being called.

Answer 1

Developer of ParseKit here. Make sure you are using head of trunk on google code.

1. Assembler callbacks now have two arguments.
2. By default, the string <title> will not be tokenized as a single Symbol token. That would be one < Symbol token, one title Word token and one > Symbol token. You could configure that behavior, however.

Please read the documentation on ParseKit, particularly the tokenization docs to understand how tokenization in ParseKit works.

---

Here’s what’s missing to accomplish your basic task above. However, I’m not sure this is the best approach for a real world task. I think reading the docs mentioned above would help explain that.

PKTokenizer *t = [PKTokenizer tokenizerWithString:@"<title>foobar</title>"];
[t.symbolState add:@"<title>"];
[t.symbolState add:@"</title>"];

PKAssembly *a = [PKTokenAssembly assemblyWithTokenizer:t];

PKSequence *p = [PKSequence sequence];

[p add:[PKSymbol symbolWithString:@"<title>"]]; 

PKWord *word = [PKWord word];
[word setAssembler:self selector:@selector(parser:didMatchWord:)];
[p add:word];

[p add:[PKSymbol symbolWithString:@"</title>"]];

PKAssembly *result = [p bestMatchFor:a];

---

-(void)parser:(PKParser *)p didMatchWord:(PKAssembly *)a {
        NSLog(@"%s %@", __PRETTY_FUNCTION__, a);
}