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<title>src/Language/Python/Version3/Parser.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# OPTIONS  #-}</span>
<a name="line-2"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-3"></a><span class='hs-comment'>-- |</span>
<a name="line-4"></a><span class='hs-comment'>-- Module      : Language.Python.Version3.Parser</span>
<a name="line-5"></a><span class='hs-comment'>-- Copyright   : (c) 2009 Bernie Pope </span>
<a name="line-6"></a><span class='hs-comment'>-- License     : BSD-style</span>
<a name="line-7"></a><span class='hs-comment'>-- Maintainer  : bjpop@csse.unimelb.edu.au</span>
<a name="line-8"></a><span class='hs-comment'>-- Stability   : experimental</span>
<a name="line-9"></a><span class='hs-comment'>-- Portability : ghc</span>
<a name="line-10"></a><span class='hs-comment'>--</span>
<a name="line-11"></a><span class='hs-comment'>-- A parser for Python version 3.x programs. Parsers are provided for </span>
<a name="line-12"></a><span class='hs-comment'>-- modules, statements, and expressions. The parsers produce comment tokens</span>
<a name="line-13"></a><span class='hs-comment'>-- in addition to the abstract syntax tree.</span>
<a name="line-14"></a><span class='hs-comment'>--</span>
<a name="line-15"></a><span class='hs-comment'>-- See: </span>
<a name="line-16"></a><span class='hs-comment'>--</span>
<a name="line-17"></a><span class='hs-comment'>-- * &lt;<a href="http://www.python.org/doc/3.1/reference/index.html">http://www.python.org/doc/3.1/reference/index.html</a>&gt; for an overview of the language. </span>
<a name="line-18"></a><span class='hs-comment'>--</span>
<a name="line-19"></a><span class='hs-comment'>-- * &lt;<a href="http://www.python.org/doc/3.1/reference/grammar.html">http://www.python.org/doc/3.1/reference/grammar.html</a>&gt; for the full grammar.</span>
<a name="line-20"></a><span class='hs-comment'>-- </span>
<a name="line-21"></a><span class='hs-comment'>-- * &lt;<a href="http://www.python.org/doc/3.1/reference/toplevel_components.html">http://www.python.org/doc/3.1/reference/toplevel_components.html</a>&gt; for a description of </span>
<a name="line-22"></a><span class='hs-comment'>-- the various Python top-levels, which correspond to the parsers provided here.</span>
<a name="line-23"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-24"></a>
<a name="line-25"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Language</span><span class='hs-varop'>.</span><span class='hs-conid'>Python</span><span class='hs-varop'>.</span><span class='hs-conid'>Version3</span><span class='hs-varop'>.</span><span class='hs-conid'>Parser</span> <span class='hs-layout'>(</span>
<a name="line-26"></a>   <span class='hs-comment'>-- * Parsing modules</span>
<a name="line-27"></a>   <span class='hs-varid'>parseModule</span><span class='hs-layout'>,</span>
<a name="line-28"></a>   <span class='hs-comment'>-- * Parsing statements</span>
<a name="line-29"></a>   <span class='hs-varid'>parseStmt</span><span class='hs-layout'>,</span>
<a name="line-30"></a>   <span class='hs-comment'>-- * Parsing expressions</span>
<a name="line-31"></a>   <span class='hs-varid'>parseExpr</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-32"></a>
<a name="line-33"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Language</span><span class='hs-varop'>.</span><span class='hs-conid'>Python</span><span class='hs-varop'>.</span><span class='hs-conid'>Version3</span><span class='hs-varop'>.</span><span class='hs-conid'>Parser</span><span class='hs-varop'>.</span><span class='hs-conid'>Parser</span> <span class='hs-layout'>(</span><span class='hs-varid'>parseFileInput</span><span class='hs-layout'>,</span> <span class='hs-varid'>parseSingleInput</span><span class='hs-layout'>,</span> <span class='hs-varid'>parseEval</span><span class='hs-layout'>)</span>
<a name="line-34"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Language</span><span class='hs-varop'>.</span><span class='hs-conid'>Python</span><span class='hs-varop'>.</span><span class='hs-conid'>Version3</span><span class='hs-varop'>.</span><span class='hs-conid'>Parser</span><span class='hs-varop'>.</span><span class='hs-conid'>Lexer</span> <span class='hs-layout'>(</span><span class='hs-varid'>initStartCodeStack</span><span class='hs-layout'>)</span>
<a name="line-35"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Language</span><span class='hs-varop'>.</span><span class='hs-conid'>Python</span><span class='hs-varop'>.</span><span class='hs-conid'>Common</span><span class='hs-varop'>.</span><span class='hs-conid'>AST</span> <span class='hs-layout'>(</span><span class='hs-conid'>ModuleSpan</span><span class='hs-layout'>,</span> <span class='hs-conid'>StatementSpan</span><span class='hs-layout'>,</span> <span class='hs-conid'>ExprSpan</span><span class='hs-layout'>)</span>
<a name="line-36"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Language</span><span class='hs-varop'>.</span><span class='hs-conid'>Python</span><span class='hs-varop'>.</span><span class='hs-conid'>Common</span><span class='hs-varop'>.</span><span class='hs-conid'>Token</span> <span class='hs-layout'>(</span><span class='hs-conid'>Token</span><span class='hs-layout'>)</span>
<a name="line-37"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Language</span><span class='hs-varop'>.</span><span class='hs-conid'>Python</span><span class='hs-varop'>.</span><span class='hs-conid'>Common</span><span class='hs-varop'>.</span><span class='hs-conid'>SrcLocation</span> <span class='hs-layout'>(</span><span class='hs-varid'>initialSrcLocation</span><span class='hs-layout'>)</span>
<a name="line-38"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Language</span><span class='hs-varop'>.</span><span class='hs-conid'>Python</span><span class='hs-varop'>.</span><span class='hs-conid'>Common</span><span class='hs-varop'>.</span><span class='hs-conid'>ParserMonad</span> <span class='hs-layout'>(</span><span class='hs-varid'>execParser</span><span class='hs-layout'>,</span> <span class='hs-varid'>execParserKeepComments</span><span class='hs-layout'>,</span> <span class='hs-conid'>ParseError</span><span class='hs-layout'>,</span> <span class='hs-varid'>initialState</span><span class='hs-layout'>)</span>
<a name="line-39"></a>
<a name="line-40"></a><a name="parseModule"></a><span class='hs-comment'>-- | Parse a whole Python source file. Return comments in addition to the parsed module.</span>
<a name="line-41"></a><span class='hs-definition'>parseModule</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ The input stream (python module source code). </span>
<a name="line-42"></a>      <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ The name of the python source (filename or input device). </span>
<a name="line-43"></a>      <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Either</span> <span class='hs-conid'>ParseError</span> <span class='hs-layout'>(</span><span class='hs-conid'>ModuleSpan</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Token</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ An error or the abstract syntax tree (AST) of the python module and comment tokens.</span>
<a name="line-44"></a><span class='hs-definition'>parseModule</span> <span class='hs-varid'>input</span> <span class='hs-varid'>srcName</span> <span class='hs-keyglyph'>=</span> 
<a name="line-45"></a>   <span class='hs-varid'>execParserKeepComments</span> <span class='hs-varid'>parseFileInput</span> <span class='hs-varid'>state</span> 
<a name="line-46"></a>   <span class='hs-keyword'>where</span>
<a name="line-47"></a>   <span class='hs-varid'>initLoc</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>initialSrcLocation</span> <span class='hs-varid'>srcName</span>
<a name="line-48"></a>   <span class='hs-varid'>state</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>initialState</span> <span class='hs-varid'>initLoc</span> <span class='hs-varid'>input</span> <span class='hs-varid'>initStartCodeStack</span>
<a name="line-49"></a>
<a name="line-50"></a><a name="parseStmt"></a><span class='hs-comment'>-- | Parse one compound statement, or a sequence of simple statements. Generally used for interactive input, such as from the command line of an interpreter. Return comments in addition to the parsed statements.</span>
<a name="line-51"></a><span class='hs-definition'>parseStmt</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ The input stream (python statement source code). </span>
<a name="line-52"></a>      <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ The name of the python source (filename or input device). </span>
<a name="line-53"></a>      <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Either</span> <span class='hs-conid'>ParseError</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>StatementSpan</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Token</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ An error or maybe the abstract syntax tree (AST) of zero or more python statements, plus comments.</span>
<a name="line-54"></a><span class='hs-definition'>parseStmt</span> <span class='hs-varid'>input</span> <span class='hs-varid'>srcName</span> <span class='hs-keyglyph'>=</span> 
<a name="line-55"></a>   <span class='hs-varid'>execParserKeepComments</span> <span class='hs-varid'>parseSingleInput</span> <span class='hs-varid'>state</span> 
<a name="line-56"></a>   <span class='hs-keyword'>where</span>
<a name="line-57"></a>   <span class='hs-varid'>initLoc</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>initialSrcLocation</span> <span class='hs-varid'>srcName</span>
<a name="line-58"></a>   <span class='hs-varid'>state</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>initialState</span> <span class='hs-varid'>initLoc</span> <span class='hs-varid'>input</span> <span class='hs-varid'>initStartCodeStack</span>
<a name="line-59"></a>
<a name="line-60"></a><a name="parseExpr"></a><span class='hs-comment'>-- | Parse an expression. Generally used as input for the \'eval\' primitive. Return comments in addition to the parsed expression.</span>
<a name="line-61"></a><span class='hs-definition'>parseExpr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ The input stream (python statement source code). </span>
<a name="line-62"></a>      <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ The name of the python source (filename or input device). </span>
<a name="line-63"></a>      <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Either</span> <span class='hs-conid'>ParseError</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExprSpan</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Token</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ An error or maybe the abstract syntax tree (AST) of the python expression, plus comment tokens.</span>
<a name="line-64"></a><span class='hs-definition'>parseExpr</span> <span class='hs-varid'>input</span> <span class='hs-varid'>srcName</span> <span class='hs-keyglyph'>=</span> 
<a name="line-65"></a>   <span class='hs-varid'>execParserKeepComments</span> <span class='hs-varid'>parseEval</span> <span class='hs-varid'>state</span> 
<a name="line-66"></a>   <span class='hs-keyword'>where</span>
<a name="line-67"></a>   <span class='hs-varid'>initLoc</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>initialSrcLocation</span> <span class='hs-varid'>srcName</span>
<a name="line-68"></a>   <span class='hs-varid'>state</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>initialState</span> <span class='hs-varid'>initLoc</span> <span class='hs-varid'>input</span> <span class='hs-varid'>initStartCodeStack</span>
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