hxt-8.0.0: doc/hdoc/src/Text-XML-HXT-Validator-XmlRE.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<!-- Generated by HsColour, http://www.cs.york.ac.uk/fp/darcs/hscolour/ -->
<title>Haskell Code by HsColour</title>
<link type='text/css' rel='stylesheet' href='hscolour.css' />
</head>
<body>
<pre><a name="line-1"></a><span class='comment'>-- |</span>
<a name="line-2"></a><span class='comment'>-- A module for regular expression matching, adapted for XML DTDs.</span>
<a name="line-3"></a><span class='comment'>--</span>
<a name="line-4"></a><span class='comment'>-- This module is based on the module RE.</span>
<a name="line-5"></a><span class='comment'>--</span>
<a name="line-6"></a><span class='comment'>-- Author .\\artin Schmidt</span>
<a name="line-7"></a>
<a name="line-8"></a><span class='comment'>-- Version : $Id: XmlRE.hs,v 1.1 2004/09/02 19:12:03 hxml Exp $</span>
<a name="line-9"></a>
<a name="line-10"></a><span class='keyword'>module</span> <span class='conid'>Text</span><span class='varop'>.</span><span class='conid'>XML</span><span class='varop'>.</span><span class='conid'>HXT</span><span class='varop'>.</span><span class='conid'>Validator</span><span class='varop'>.</span><span class='conid'>XmlRE</span>
<a name="line-11"></a> <span class='layout'>(</span> <span class='conid'>RE</span>
<a name="line-12"></a>
<a name="line-13"></a> <span class='layout'>,</span> <span class='varid'>checkRE</span>
<a name="line-14"></a> <span class='layout'>,</span> <span class='varid'>matches</span>
<a name="line-15"></a> <span class='layout'>,</span> <span class='varid'>printRE</span>
<a name="line-16"></a>
<a name="line-17"></a> <span class='layout'>,</span> <span class='varid'>re_unit</span>
<a name="line-18"></a> <span class='layout'>,</span> <span class='varid'>re_zero</span>
<a name="line-19"></a> <span class='layout'>,</span> <span class='varid'>re_sym</span>
<a name="line-20"></a> <span class='layout'>,</span> <span class='varid'>re_rep</span>
<a name="line-21"></a> <span class='layout'>,</span> <span class='varid'>re_plus</span>
<a name="line-22"></a> <span class='layout'>,</span> <span class='varid'>re_opt</span>
<a name="line-23"></a> <span class='layout'>,</span> <span class='varid'>re_seq</span>
<a name="line-24"></a> <span class='layout'>,</span> <span class='varid'>re_alt</span>
<a name="line-25"></a> <span class='layout'>,</span> <span class='varid'>re_dot</span>
<a name="line-26"></a> <span class='layout'>)</span>
<a name="line-27"></a><span class='keyword'>where</span>
<a name="line-28"></a>
<a name="line-29"></a><span class='comment'>-- import Debug.Trace(trace)</span>
<a name="line-30"></a>
<a name="line-31"></a><span class='keyword'>import</span> <span class='conid'>Text</span><span class='varop'>.</span><span class='conid'>XML</span><span class='varop'>.</span><span class='conid'>HXT</span><span class='varop'>.</span><span class='conid'>Validator</span><span class='varop'>.</span><span class='conid'>RE</span> <span class='varid'>hiding</span> <span class='layout'>(</span><span class='varid'>matches</span><span class='layout'>)</span>
<a name="line-32"></a>
<a name="line-33"></a><span class='keyword'>import</span> <span class='conid'>Text</span><span class='varop'>.</span><span class='conid'>XML</span><span class='varop'>.</span><span class='conid'>HXT</span><span class='varop'>.</span><span class='conid'>DOM</span><span class='varop'>.</span><span class='conid'>XmlTree</span>
<a name="line-34"></a>
<a name="line-35"></a><span class='keyword'>import</span> <span class='conid'>Text</span><span class='varop'>.</span><span class='conid'>XML</span><span class='varop'>.</span><span class='conid'>HXT</span><span class='varop'>.</span><span class='conid'>DOM</span><span class='varop'>.</span><span class='conid'>EditFilters</span>
<a name="line-36"></a> <span class='layout'>(</span> <span class='varid'>removeComment</span>
<a name="line-37"></a> <span class='layout'>,</span> <span class='varid'>removeWhiteSpace</span>
<a name="line-38"></a> <span class='layout'>)</span>
<a name="line-39"></a>
<a name="line-40"></a><span class='comment'>-- |</span>
<a name="line-41"></a><span class='comment'>-- Derives a regular expression with respect to a list of elements.</span>
<a name="line-42"></a><span class='comment'>--</span>
<a name="line-43"></a><span class='comment'>-- * 1.parameter re : regular expression</span>
<a name="line-44"></a><span class='comment'>--</span>
<a name="line-45"></a><span class='comment'>-- - 2.parameter list : list of elements to which the regular expression is applied</span>
<a name="line-46"></a><span class='comment'>--</span>
<a name="line-47"></a><span class='comment'>-- - returns : the derived regular expression</span>
<a name="line-48"></a>
<a name="line-49"></a><a name="matches"></a><span class='definition'>matches</span> <span class='keyglyph'>::</span> <span class='conid'>RE</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>XmlTrees</span> <span class='keyglyph'>-></span> <span class='conid'>RE</span> <span class='conid'>String</span>
<a name="line-50"></a><span class='definition'>matches</span> <span class='varid'>re</span> <span class='varid'>list</span>
<a name="line-51"></a> <span class='keyglyph'>=</span> <span class='varid'>foldl</span> <span class='varid'>delta</span> <span class='varid'>re</span> <span class='layout'>(</span><span class='varid'>removeUnimportantStuff</span> <span class='varop'>$$</span> <span class='varid'>list</span><span class='layout'>)</span>
<a name="line-52"></a> <span class='keyword'>where</span>
<a name="line-53"></a> <span class='varid'>removeUnimportantStuff</span> <span class='keyglyph'>::</span> <span class='conid'>XmlFilter</span>
<a name="line-54"></a> <span class='varid'>removeUnimportantStuff</span> <span class='keyglyph'>=</span> <span class='varid'>processBottomUp</span> <span class='layout'>(</span><span class='varid'>removeWhiteSpace</span> <span class='varop'>`o`</span> <span class='varid'>removeComment</span><span class='layout'>)</span>
<a name="line-55"></a> <span class='comment'>-- trace of growth of REs</span>
<a name="line-56"></a> <span class='comment'>-- delta' re el = delta (trace (("RE : " ++) . (++ "\n" ) . show $ re) re) el</span>
<a name="line-57"></a>
<a name="line-58"></a>
<a name="line-59"></a><span class='comment'>-- |</span>
<a name="line-60"></a><span class='comment'>-- Derives a regular expression with respect to one element.</span>
<a name="line-61"></a><span class='comment'>--</span>
<a name="line-62"></a><span class='comment'>-- L(delta e x) = x \ L(e)</span>
<a name="line-63"></a><span class='comment'>--</span>
<a name="line-64"></a><span class='comment'>-- * 1.parameter re : regular expression to be derived</span>
<a name="line-65"></a><span class='comment'>--</span>
<a name="line-66"></a><span class='comment'>-- - 2.parameter el : the element on which the regular expression is applied</span>
<a name="line-67"></a><span class='comment'>--</span>
<a name="line-68"></a><span class='comment'>-- - returns : the derived regular expression</span>
<a name="line-69"></a>
<a name="line-70"></a><a name="delta"></a><span class='definition'>delta</span> <span class='keyglyph'>::</span> <span class='conid'>RE</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='conid'>RE</span> <span class='conid'>String</span>
<a name="line-71"></a><span class='definition'>delta</span> <span class='varid'>re</span> <span class='varid'>el</span>
<a name="line-72"></a> <span class='keyglyph'>|</span> <span class='varid'>not</span> <span class='layout'>(</span><span class='varid'>allowed</span> <span class='varid'>el</span><span class='layout'>)</span> <span class='keyglyph'>=</span> <span class='varid'>re</span>
<a name="line-73"></a> <span class='keyglyph'>|</span> <span class='varid'>otherwise</span> <span class='keyglyph'>=</span> <span class='keyword'>case</span> <span class='varid'>re</span> <span class='keyword'>of</span>
<a name="line-74"></a> <span class='conid'>RE_ZERO</span> <span class='varid'>m</span> <span class='keyglyph'>-></span> <span class='varid'>re_zero</span> <span class='varid'>m</span>
<a name="line-75"></a> <span class='conid'>RE_UNIT</span> <span class='keyglyph'>-></span> <span class='varid'>re_zero</span> <span class='layout'>(</span><span class='varid'>elemName</span> <span class='varid'>el</span> <span class='varop'>++</span><span class='str'>" unexpected."</span><span class='layout'>)</span>
<a name="line-76"></a> <span class='conid'>RE_SYM</span> <span class='varid'>sym</span>
<a name="line-77"></a> <span class='keyglyph'>|</span> <span class='varid'>sym</span> <span class='varop'>==</span> <span class='varid'>k_pcdata</span> <span class='keyglyph'>-></span> <span class='keyword'>let</span> <span class='varid'>node</span> <span class='keyglyph'>=</span> <span class='varid'>getNode</span> <span class='varid'>el</span> <span class='keyword'>in</span>
<a name="line-78"></a> <span class='keyword'>if</span> <span class='layout'>(</span><span class='layout'>(</span><span class='varid'>isXTextNode</span> <span class='varid'>node</span><span class='layout'>)</span> <span class='varop'>||</span> <span class='layout'>(</span><span class='varid'>isXCdataNode</span> <span class='varid'>node</span><span class='layout'>)</span><span class='layout'>)</span>
<a name="line-79"></a> <span class='keyword'>then</span> <span class='varid'>re_unit</span>
<a name="line-80"></a> <span class='keyword'>else</span> <span class='varid'>re_zero</span> <span class='layout'>(</span><span class='str'>"Character data expected, but "</span><span class='varop'>++</span> <span class='varid'>elemName</span> <span class='varid'>el</span> <span class='varop'>++</span><span class='str'>" found."</span><span class='layout'>)</span>
<a name="line-81"></a> <span class='keyglyph'>|</span> <span class='varid'>expectedNode</span> <span class='varid'>el</span> <span class='varid'>sym</span> <span class='keyglyph'>-></span> <span class='varid'>re_unit</span>
<a name="line-82"></a> <span class='keyglyph'>|</span> <span class='varid'>otherwise</span> <span class='keyglyph'>-></span> <span class='varid'>re_zero</span> <span class='layout'>(</span><span class='str'>"Element "</span><span class='varop'>++</span> <span class='varid'>show</span> <span class='varid'>sym</span> <span class='varop'>++</span><span class='str'>" expected, but "</span><span class='varop'>++</span> <span class='varid'>elemName</span> <span class='varid'>el</span> <span class='varop'>++</span><span class='str'>" found."</span><span class='layout'>)</span>
<a name="line-83"></a> <span class='conid'>RE_REP</span> <span class='varid'>e</span> <span class='keyglyph'>-></span> <span class='varid'>re_seq</span> <span class='layout'>(</span><span class='varid'>delta</span> <span class='varid'>e</span> <span class='varid'>el</span><span class='layout'>)</span> <span class='layout'>(</span><span class='varid'>re_rep</span> <span class='varid'>e</span><span class='layout'>)</span>
<a name="line-84"></a> <span class='conid'>RE_PLUS</span> <span class='varid'>e</span> <span class='keyglyph'>-></span> <span class='varid'>re_seq</span> <span class='layout'>(</span><span class='varid'>delta</span> <span class='varid'>e</span> <span class='varid'>el</span><span class='layout'>)</span> <span class='layout'>(</span><span class='varid'>re_rep</span> <span class='varid'>e</span><span class='layout'>)</span>
<a name="line-85"></a> <span class='conid'>RE_OPT</span> <span class='varid'>e</span> <span class='keyglyph'>-></span> <span class='varid'>delta</span> <span class='varid'>e</span> <span class='varid'>el</span>
<a name="line-86"></a> <span class='conid'>RE_SEQ</span> <span class='varid'>e</span> <span class='varid'>f</span>
<a name="line-87"></a> <span class='keyglyph'>|</span> <span class='varid'>nullable</span> <span class='varid'>e</span> <span class='keyglyph'>-></span> <span class='varid'>re_alt</span> <span class='layout'>(</span><span class='varid'>re_seq</span> <span class='layout'>(</span><span class='varid'>delta</span> <span class='varid'>e</span> <span class='varid'>el</span><span class='layout'>)</span> <span class='varid'>f</span><span class='layout'>)</span> <span class='layout'>(</span><span class='varid'>delta</span> <span class='varid'>f</span> <span class='varid'>el</span><span class='layout'>)</span>
<a name="line-88"></a> <span class='keyglyph'>|</span> <span class='varid'>otherwise</span> <span class='keyglyph'>-></span> <span class='varid'>re_seq</span> <span class='layout'>(</span><span class='varid'>delta</span> <span class='varid'>e</span> <span class='varid'>el</span><span class='layout'>)</span> <span class='varid'>f</span>
<a name="line-89"></a> <span class='conid'>RE_ALT</span> <span class='varid'>e</span> <span class='varid'>f</span> <span class='keyglyph'>-></span> <span class='varid'>re_alt</span> <span class='layout'>(</span><span class='varid'>delta</span> <span class='varid'>e</span> <span class='varid'>el</span><span class='layout'>)</span> <span class='layout'>(</span><span class='varid'>delta</span> <span class='varid'>f</span> <span class='varid'>el</span><span class='layout'>)</span>
<a name="line-90"></a> <span class='conid'>RE_DOT</span> <span class='keyglyph'>-></span> <span class='varid'>re_unit</span>
<a name="line-91"></a>
<a name="line-92"></a> <span class='keyword'>where</span>
<a name="line-93"></a> <span class='varid'>expectedNode</span> <span class='keyglyph'>::</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>Bool</span>
<a name="line-94"></a> <span class='varid'>expectedNode</span> <span class='layout'>(</span><span class='conid'>NTree</span> <span class='layout'>(</span><span class='conid'>XTag</span> <span class='varid'>n</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='varid'>sym</span> <span class='keyglyph'>=</span> <span class='layout'>(</span><span class='varid'>qualifiedName</span> <span class='varid'>n</span><span class='layout'>)</span> <span class='varop'>==</span> <span class='varid'>sym</span>
<a name="line-95"></a> <span class='varid'>expectedNode</span> <span class='keyword'>_</span> <span class='keyword'>_</span> <span class='keyglyph'>=</span> <span class='conid'>False</span>
<a name="line-96"></a>
<a name="line-97"></a> <span class='varid'>elemName</span> <span class='keyglyph'>::</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='conid'>String</span>
<a name="line-98"></a> <span class='varid'>elemName</span> <span class='layout'>(</span><span class='conid'>NTree</span> <span class='layout'>(</span><span class='conid'>XTag</span> <span class='varid'>n</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='keyglyph'>=</span> <span class='str'>"element "</span><span class='varop'>++</span> <span class='varid'>show</span> <span class='layout'>(</span><span class='varid'>qualifiedName</span> <span class='varid'>n</span><span class='layout'>)</span>
<a name="line-99"></a> <span class='varid'>elemName</span> <span class='keyword'>_</span> <span class='keyglyph'>=</span> <span class='str'>"character data"</span>
<a name="line-100"></a>
<a name="line-101"></a> <span class='varid'>allowed</span> <span class='keyglyph'>::</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='conid'>Bool</span>
<a name="line-102"></a> <span class='varid'>allowed</span> <span class='layout'>(</span><span class='conid'>NTree</span> <span class='layout'>(</span><span class='conid'>XTag</span> <span class='keyword'>_</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='keyglyph'>=</span> <span class='conid'>True</span>
<a name="line-103"></a> <span class='varid'>allowed</span> <span class='layout'>(</span><span class='conid'>NTree</span> <span class='layout'>(</span><span class='conid'>XText</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='keyglyph'>=</span> <span class='conid'>True</span>
<a name="line-104"></a> <span class='varid'>allowed</span> <span class='layout'>(</span><span class='conid'>NTree</span> <span class='layout'>(</span><span class='conid'>XCdata</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='keyglyph'>=</span> <span class='conid'>True</span>
<a name="line-105"></a> <span class='varid'>allowed</span> <span class='keyword'>_</span> <span class='keyglyph'>=</span> <span class='conid'>False</span>
</pre></body>
</html>