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<h2 class="chapter">3 Bison Grammar Files</h2>
<p>Bison takes as input a context-free grammar specification and produces a
C-language function that recognizes correct instances of the grammar.
<p>The Bison grammar file conventionally has a name ending in ‘<samp><span class="samp">.y</span></samp>’.
See <a href="Invocation.html#Invocation">Invoking Bison</a>.
<ul class="menu">
<li><a accesskey="1" href="Grammar-Outline.html#Grammar-Outline">Grammar Outline</a>: Overall layout of the grammar file.
<li><a accesskey="2" href="Symbols.html#Symbols">Symbols</a>: Terminal and nonterminal symbols.
<li><a accesskey="3" href="Rules.html#Rules">Rules</a>: How to write grammar rules.
<li><a accesskey="4" href="Recursion.html#Recursion">Recursion</a>: Writing recursive rules.
<li><a accesskey="5" href="Semantics.html#Semantics">Semantics</a>: Semantic values and actions.
<li><a accesskey="6" href="Locations.html#Locations">Locations</a>: Locations and actions.
<li><a accesskey="7" href="Declarations.html#Declarations">Declarations</a>: All kinds of Bison declarations are described here.
<li><a accesskey="8" href="Multiple-Parsers.html#Multiple-Parsers">Multiple Parsers</a>: Putting more than one Bison parser in one program.
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