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<title>src/full/Agda/Syntax/Parser.hs</title>
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<pre><a name="line-1"></a>
<a name="line-2"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Agda</span><span class='hs-varop'>.</span><span class='hs-conid'>Syntax</span><span class='hs-varop'>.</span><span class='hs-conid'>Parser</span>
<a name="line-3"></a> <span class='hs-layout'>(</span> <span class='hs-comment'>-- * Types</span>
<a name="line-4"></a> <span class='hs-conid'>Parser</span>
<a name="line-5"></a> <span class='hs-comment'>-- * Parse functions</span>
<a name="line-6"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Agda</span><span class='hs-varop'>.</span><span class='hs-conid'>Syntax</span><span class='hs-varop'>.</span><span class='hs-conid'>Parser</span><span class='hs-varop'>.</span><span class='hs-varid'>parse</span>
<a name="line-7"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Agda</span><span class='hs-varop'>.</span><span class='hs-conid'>Syntax</span><span class='hs-varop'>.</span><span class='hs-conid'>Parser</span><span class='hs-varop'>.</span><span class='hs-varid'>parseLiterate</span>
<a name="line-8"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Agda</span><span class='hs-varop'>.</span><span class='hs-conid'>Syntax</span><span class='hs-varop'>.</span><span class='hs-conid'>Parser</span><span class='hs-varop'>.</span><span class='hs-varid'>parsePosString</span>
<a name="line-9"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>parseFile'</span>
<a name="line-10"></a> <span class='hs-comment'>-- * Parsers</span>
<a name="line-11"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>moduleParser</span>
<a name="line-12"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>exprParser</span>
<a name="line-13"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>tokensParser</span>
<a name="line-14"></a> <span class='hs-comment'>-- * Parse errors</span>
<a name="line-15"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>ParseError</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-16"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-17"></a>
<a name="line-18"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span>
<a name="line-19"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span>
<a name="line-20"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Directory</span>
<a name="line-21"></a>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Agda</span><span class='hs-varop'>.</span><span class='hs-conid'>Syntax</span><span class='hs-varop'>.</span><span class='hs-conid'>Position</span>
<a name="line-23"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Agda</span><span class='hs-varop'>.</span><span class='hs-conid'>Syntax</span><span class='hs-varop'>.</span><span class='hs-conid'>Parser</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>M</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-conid'>Parser</span><span class='hs-layout'>,</span> <span class='hs-varid'>parseFlags</span><span class='hs-layout'>)</span>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Agda</span><span class='hs-varop'>.</span><span class='hs-conid'>Syntax</span><span class='hs-varop'>.</span><span class='hs-conid'>Parser</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>M</span>
<a name="line-25"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Agda</span><span class='hs-varop'>.</span><span class='hs-conid'>Syntax</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-keyword'>as</span> <span class='hs-conid'>P</span>
<a name="line-26"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Agda</span><span class='hs-varop'>.</span><span class='hs-conid'>Syntax</span><span class='hs-varop'>.</span><span class='hs-conid'>Parser</span><span class='hs-varop'>.</span><span class='hs-conid'>Lexer</span>
<a name="line-27"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Agda</span><span class='hs-varop'>.</span><span class='hs-conid'>Syntax</span><span class='hs-varop'>.</span><span class='hs-conid'>Concrete</span>
<a name="line-28"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Agda</span><span class='hs-varop'>.</span><span class='hs-conid'>Syntax</span><span class='hs-varop'>.</span><span class='hs-conid'>Parser</span><span class='hs-varop'>.</span><span class='hs-conid'>Tokens</span>
<a name="line-29"></a>
<a name="line-30"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Agda</span><span class='hs-varop'>.</span><span class='hs-conid'>Utils</span><span class='hs-varop'>.</span><span class='hs-conid'>FileName</span>
<a name="line-31"></a>
<a name="line-32"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-33"></a><span class='hs-comment'>-- Wrapping parse results</span>
<a name="line-34"></a>
<a name="line-35"></a><a name="wrap"></a><span class='hs-definition'>wrap</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ParseResult</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-36"></a><span class='hs-definition'>wrap</span> <span class='hs-layout'>(</span><span class='hs-conid'>ParseOk</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
<a name="line-37"></a><span class='hs-definition'>wrap</span> <span class='hs-layout'>(</span><span class='hs-conid'>ParseFailed</span> <span class='hs-varid'>err</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>throw</span> <span class='hs-varid'>err</span>
<a name="line-38"></a>
<a name="line-39"></a><a name="wrapM"></a><span class='hs-definition'>wrapM</span><span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>ParseResult</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-40"></a><span class='hs-definition'>wrapM</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span>
<a name="line-41"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>m</span>
<a name="line-42"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>of</span>
<a name="line-43"></a> <span class='hs-conid'>ParseOk</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varid'>x</span>
<a name="line-44"></a> <span class='hs-conid'>ParseFailed</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>throw</span> <span class='hs-varid'>err</span>
<a name="line-45"></a>
<a name="line-46"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-47"></a><span class='hs-comment'>-- Parse functions</span>
<a name="line-48"></a>
<a name="line-49"></a><span class='hs-comment'>-- | Wrapped Parser type.</span>
<a name="line-50"></a>
<a name="line-51"></a><a name="Parser"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Parser</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Parser</span>
<a name="line-52"></a> <span class='hs-layout'>{</span> <span class='hs-varid'>parser</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>M</span><span class='hs-varop'>.</span><span class='hs-conid'>Parser</span> <span class='hs-varid'>a</span>
<a name="line-53"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>parseFlags</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ParseFlags</span>
<a name="line-54"></a> <span class='hs-layout'>}</span>
<a name="line-55"></a>
<a name="line-56"></a><a name="parse"></a><span class='hs-definition'>parse</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Parser</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-57"></a><span class='hs-definition'>parse</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>wrapM</span> <span class='hs-varop'>.</span> <span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-conid'>M</span><span class='hs-varop'>.</span><span class='hs-varid'>parse</span> <span class='hs-layout'>(</span><span class='hs-varid'>parseFlags</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>normal</span><span class='hs-keyglyph'>]</span> <span class='hs-layout'>(</span><span class='hs-varid'>parser</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-58"></a>
<a name="line-59"></a><a name="parseFile"></a><span class='hs-definition'>parseFile</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Parser</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>AbsolutePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-60"></a><span class='hs-definition'>parseFile</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>wrapM</span> <span class='hs-varop'>.</span> <span class='hs-conid'>M</span><span class='hs-varop'>.</span><span class='hs-varid'>parseFile</span> <span class='hs-layout'>(</span><span class='hs-varid'>parseFlags</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>normal</span><span class='hs-keyglyph'>]</span> <span class='hs-layout'>(</span><span class='hs-varid'>parser</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-61"></a>
<a name="line-62"></a><a name="parseLiterate"></a><span class='hs-definition'>parseLiterate</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Parser</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-63"></a><span class='hs-definition'>parseLiterate</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span>
<a name="line-64"></a> <span class='hs-varid'>wrapM</span> <span class='hs-varop'>.</span> <span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-conid'>M</span><span class='hs-varop'>.</span><span class='hs-varid'>parse</span> <span class='hs-layout'>(</span><span class='hs-varid'>parseFlags</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>literate</span><span class='hs-layout'>,</span> <span class='hs-varid'>code</span><span class='hs-keyglyph'>]</span> <span class='hs-layout'>(</span><span class='hs-varid'>parser</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-65"></a>
<a name="line-66"></a><a name="parseLiterateFile"></a><span class='hs-definition'>parseLiterateFile</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Parser</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>AbsolutePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-67"></a><span class='hs-definition'>parseLiterateFile</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span>
<a name="line-68"></a> <span class='hs-varid'>wrapM</span> <span class='hs-varop'>.</span> <span class='hs-conid'>M</span><span class='hs-varop'>.</span><span class='hs-varid'>parseFile</span> <span class='hs-layout'>(</span><span class='hs-varid'>parseFlags</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>literate</span><span class='hs-layout'>,</span> <span class='hs-varid'>code</span><span class='hs-keyglyph'>]</span> <span class='hs-layout'>(</span><span class='hs-varid'>parser</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-69"></a>
<a name="line-70"></a><a name="parsePosString"></a><span class='hs-definition'>parsePosString</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Parser</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Position</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-71"></a><span class='hs-definition'>parsePosString</span> <span class='hs-varid'>p</span> <span class='hs-varid'>pos</span> <span class='hs-keyglyph'>=</span>
<a name="line-72"></a> <span class='hs-varid'>wrapM</span> <span class='hs-varop'>.</span> <span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-conid'>M</span><span class='hs-varop'>.</span><span class='hs-varid'>parsePosString</span> <span class='hs-varid'>pos</span> <span class='hs-layout'>(</span><span class='hs-varid'>parseFlags</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>normal</span><span class='hs-keyglyph'>]</span> <span class='hs-layout'>(</span><span class='hs-varid'>parser</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-73"></a>
<a name="line-74"></a><a name="parseFile'"></a><span class='hs-definition'>parseFile'</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Parser</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>AbsolutePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-75"></a><span class='hs-definition'>parseFile'</span> <span class='hs-varid'>p</span> <span class='hs-varid'>file</span> <span class='hs-keyglyph'>=</span>
<a name="line-76"></a> <span class='hs-keyword'>if</span> <span class='hs-str'>"lagda"</span> <span class='hs-varop'>`isSuffixOf`</span> <span class='hs-varid'>filePath</span> <span class='hs-varid'>file</span> <span class='hs-keyword'>then</span>
<a name="line-77"></a> <span class='hs-conid'>Agda</span><span class='hs-varop'>.</span><span class='hs-conid'>Syntax</span><span class='hs-varop'>.</span><span class='hs-conid'>Parser</span><span class='hs-varop'>.</span><span class='hs-varid'>parseLiterateFile</span> <span class='hs-varid'>p</span> <span class='hs-varid'>file</span>
<a name="line-78"></a> <span class='hs-keyword'>else</span>
<a name="line-79"></a> <span class='hs-conid'>Agda</span><span class='hs-varop'>.</span><span class='hs-conid'>Syntax</span><span class='hs-varop'>.</span><span class='hs-conid'>Parser</span><span class='hs-varop'>.</span><span class='hs-varid'>parseFile</span> <span class='hs-varid'>p</span> <span class='hs-varid'>file</span>
<a name="line-80"></a>
<a name="line-81"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-82"></a><span class='hs-comment'>-- Specific parsers</span>
<a name="line-83"></a>
<a name="line-84"></a><span class='hs-comment'>-- | Parses a module.</span>
<a name="line-85"></a>
<a name="line-86"></a><a name="moduleParser"></a><span class='hs-definition'>moduleParser</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Parser</span> <span class='hs-conid'>Module</span>
<a name="line-87"></a><span class='hs-definition'>moduleParser</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Parser</span> <span class='hs-layout'>{</span> <span class='hs-varid'>parser</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span><span class='hs-varop'>.</span><span class='hs-varid'>moduleParser</span>
<a name="line-88"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>parseFlags</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withoutComments</span> <span class='hs-layout'>}</span>
<a name="line-89"></a>
<a name="line-90"></a><span class='hs-comment'>-- | Parses an expression.</span>
<a name="line-91"></a>
<a name="line-92"></a><a name="exprParser"></a><span class='hs-definition'>exprParser</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Parser</span> <span class='hs-conid'>Expr</span>
<a name="line-93"></a><span class='hs-definition'>exprParser</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Parser</span> <span class='hs-layout'>{</span> <span class='hs-varid'>parser</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span><span class='hs-varop'>.</span><span class='hs-varid'>exprParser</span>
<a name="line-94"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>parseFlags</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withoutComments</span> <span class='hs-layout'>}</span>
<a name="line-95"></a>
<a name="line-96"></a><span class='hs-comment'>-- | Gives the parsed token stream (including comments).</span>
<a name="line-97"></a>
<a name="line-98"></a><a name="tokensParser"></a><span class='hs-definition'>tokensParser</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Parser</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Token</span><span class='hs-keyglyph'>]</span>
<a name="line-99"></a><span class='hs-definition'>tokensParser</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Parser</span> <span class='hs-layout'>{</span> <span class='hs-varid'>parser</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span><span class='hs-varop'>.</span><span class='hs-varid'>tokensParser</span>
<a name="line-100"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>parseFlags</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withComments</span> <span class='hs-layout'>}</span>
<a name="line-101"></a>
<a name="line-102"></a><span class='hs-comment'>-- | Keep comments in the token stream generated by the lexer.</span>
<a name="line-103"></a>
<a name="line-104"></a><a name="withComments"></a><span class='hs-definition'>withComments</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ParseFlags</span>
<a name="line-105"></a><span class='hs-definition'>withComments</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>defaultParseFlags</span> <span class='hs-layout'>{</span> <span class='hs-varid'>parseKeepComments</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span> <span class='hs-layout'>}</span>
<a name="line-106"></a>
<a name="line-107"></a><span class='hs-comment'>-- | Do not keep comments in the token stream generated by the lexer.</span>
<a name="line-108"></a>
<a name="line-109"></a><a name="withoutComments"></a><span class='hs-definition'>withoutComments</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ParseFlags</span>
<a name="line-110"></a><span class='hs-definition'>withoutComments</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>defaultParseFlags</span> <span class='hs-layout'>{</span> <span class='hs-varid'>parseKeepComments</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span> <span class='hs-layout'>}</span>
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