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    <p>Yacc parsers are not particularly powerful and attempting a context-free parse may be asking too much of it. I suggest using some kind of a trick to make yacc act like it is parsing a context-sensitive grammar, or, don't try to use the parser to enforce every syntax rule. </p> <ul> <li><strong>Add Context</strong> <br />Recognize when you are parsing a type, set a flag or call a method to communicate this to the scanner, and then return a different terminal symbol for <code>&lt;</code> and <code>&gt;</code> in this case.</li> <li><strong>Simplify Grammar</strong><br />Alternatively, go ahead and just use a unified expression/template syntax for part of the template production, and error out anything other than template syntax in code. The parser is the least-capable part of your system, so push work into code where possible. (No limits to code, lots of limits to yacc.)</li> </ul> <p>I'm not saying that these are your only choices. If you spent days puzzling over the state tables and tweaking the grammar to the point where yacc is happy with it, I imagine you would be "successful", but it's not worth it. At that point you may as well have just written a recursive descent parser. (RD is more lines of code, and you don't get to see the grammar neatly laid out in BNFish yacc, but at least you can parse anything and you never get bogged down with "it's not working" puzzles.)</p> <p>Does Python have any equivalent to Ruby's <a href="http://treetop.rubyforge.org/" rel="nofollow noreferrer">Treetop</a>? That would solve the problem. Bison's <code>%glr-parser</code> feature can also "solve" problems like this, albeit in a rather BFI way.</p>
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    1. POResolving a shift/reduce conflict in an LALR parser
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    1. USDigitalRoss
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    1. COUnfortunately without using a specific template rule the grammar is for more ambiguous and fails on more trivial cases. I think you're right that I need to add context, which is easy for the simple cases (builtin types, or types defined in that file), but difficult for things included using my import system. Oh well :)
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      1. USAlex Gaynor
 

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