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<a href="pyxb.utils-module.html">Package utils</a> ::
Module xmlre
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<!-- ==================== MODULE DESCRIPTION ==================== -->
<h1 class="epydoc">Module xmlre</h1><p class="nomargin-top"><span class="codelink"><a href="pyxb.utils.xmlre-pysrc.html">source code</a></span></p>
<p>Support for regular expressions conformant to the XML Schema
specification.</p>
<p>For the most part, XML regular expressions are similar to the POSIX
ones, and can be handled by the Python <code>re</code> module. The
exceptions are for multi-character (<code>\w</code>) and category escapes
(e.g., <code>\N</code> or <code>\p{IPAExtensions}</code>) and the
character set subtraction capability. This module supports those by
scanning the regular expression, replacing the category escapes with
equivalent charset expressions. It further detects the subtraction syntax
and modifies the charset expression to remove the unwanted code
points.</p>
<p>The basic technique is to step through the characters of the regular
expression, entering a recursive-descent parser when one of the
translated constructs is encountered.</p>
<p>There is a nice set of XML regular expressions at <a
href="http://www.xmlschemareference.com/examples/Ch14/regexpDemo.xsd"
target="_top">http://www.xmlschemareference.com/examples/Ch14/regexpDemo.xsd</a>,
with a sample document at <a
href="http://www.xmlschemareference.com/examples/Ch14/regexpDemo.xml"
target="_top">
http://www.xmlschemareference.com/examples/Ch14/regexpDemo.xml</a></p>
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<span class="summary-type"> </span>
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<a href="pyxb.utils.xmlre.RegularExpressionError-class.html" class="summary-name">RegularExpressionError</a><br />
Raised when a regular expression cannot be processed..
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<!-- ==================== FUNCTIONS ==================== -->
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<td><span class="summary-sig"><a href="pyxb.utils.xmlre-module.html#_MatchCharPropBraced" class="summary-sig-name" onclick="show_private();">_MatchCharPropBraced</a>(<span class="summary-sig-arg">text</span>,
<span class="summary-sig-arg">position</span>)</span><br />
Match a <a href="http://www.w3.org/TR/xmlschema-2/#nt-catEsc"
target="_top">character property</a> or <a
href="http://www.w3.org/TR/xmlschema-2/#nt-MultiCharEsc"
target="_top">multi-character escape</a> identifier, which will be
enclosed in braces.</td>
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<span class="codelink"><a href="pyxb.utils.xmlre-pysrc.html#_MatchCharPropBraced">source code</a></span>
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<td><span class="summary-sig"><a href="pyxb.utils.xmlre-module.html#_MaybeMatchCharClassEsc" class="summary-sig-name" onclick="show_private();">_MaybeMatchCharClassEsc</a>(<span class="summary-sig-arg">text</span>,
<span class="summary-sig-arg">position</span>,
<span class="summary-sig-arg">include_sce</span>=<span class="summary-sig-default">True</span>)</span><br />
Attempt to match a <a
href="http://www.w3.org/TR/xmlschema-2/#nt-charClassEsc"
target="_top">character class escape</a> expression.</td>
<td align="right" valign="top">
<span class="codelink"><a href="pyxb.utils.xmlre-pysrc.html#_MaybeMatchCharClassEsc">source code</a></span>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="pyxb.utils.xmlre-module.html#_CharOrSCE" class="summary-sig-name" onclick="show_private();">_CharOrSCE</a>(<span class="summary-sig-arg">text</span>,
<span class="summary-sig-arg">position</span>)</span><br />
Return the single character represented at the given position.</td>
<td align="right" valign="top">
<span class="codelink"><a href="pyxb.utils.xmlre-pysrc.html#_CharOrSCE">source code</a></span>
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<td><span class="summary-sig"><a href="pyxb.utils.xmlre-module.html#_MatchPosCharGroup" class="summary-sig-name" onclick="show_private();">_MatchPosCharGroup</a>(<span class="summary-sig-arg">text</span>,
<span class="summary-sig-arg">position</span>)</span><br />
Match a <a href="http://www.w3.org/TR/xmlschema-2/#nt-posCharGroup"
target="_top">positive character group</a> that begins at the given
position.</td>
<td align="right" valign="top">
<span class="codelink"><a href="pyxb.utils.xmlre-pysrc.html#_MatchPosCharGroup">source code</a></span>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="pyxb.utils.xmlre-module.html#_MatchCharGroup" class="summary-sig-name" onclick="show_private();">_MatchCharGroup</a>(<span class="summary-sig-arg">text</span>,
<span class="summary-sig-arg">position</span>)</span><br />
Match a <a href="http://www.w3.org/TR/xmlschema-2/#nt-charGroup"
target="_top">character group</a> at the given position.</td>
<td align="right" valign="top">
<span class="codelink"><a href="pyxb.utils.xmlre-pysrc.html#_MatchCharGroup">source code</a></span>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="pyxb.utils.xmlre-module.html#_MatchCharClassExpr" class="summary-sig-name" onclick="show_private();">_MatchCharClassExpr</a>(<span class="summary-sig-arg">text</span>,
<span class="summary-sig-arg">position</span>)</span><br />
Match a <a href="http://www.w3.org/TR/xmlschema-2/#nt-charClassExpr"
target="_top">character class expression</a> at the given position.</td>
<td align="right" valign="top">
<span class="codelink"><a href="pyxb.utils.xmlre-pysrc.html#_MatchCharClassExpr">source code</a></span>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="pyxb.utils.xmlre-module.html#MaybeMatchCharacterClass" class="summary-sig-name">MaybeMatchCharacterClass</a>(<span class="summary-sig-arg">text</span>,
<span class="summary-sig-arg">position</span>)</span><br />
Attempt to match a <a
href="http://www.w3.org/TR/xmlschema-2/#nt-charClassExpr"
target="_top">character class expression</a>.</td>
<td align="right" valign="top">
<span class="codelink"><a href="pyxb.utils.xmlre-pysrc.html#MaybeMatchCharacterClass">source code</a></span>
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<td><span class="summary-sig"><a href="pyxb.utils.xmlre-module.html#XMLToPython" class="summary-sig-name">XMLToPython</a>(<span class="summary-sig-arg">pattern</span>)</span><br />
Convert the given pattern to the format required for Python regular
expressions.</td>
<td align="right" valign="top">
<span class="codelink"><a href="pyxb.utils.xmlre-pysrc.html#XMLToPython">source code</a></span>
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<!-- ==================== VARIABLES ==================== -->
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<span class="summary-type"> </span>
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<a name="_NotXMLChar_set"></a><span class="summary-name">_NotXMLChar_set</span> = <code title="frozenset(['-', '[', ']'])"><code class="variable-group">frozenset([</code><code class="variable-quote">'</code><code class="variable-string">-</code><code class="variable-quote">'</code><code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">[</code><code class="variable-quote">'</code><code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">]</code><code class="variable-quote">'</code><code class="variable-group">])</code></code><br />
The set of characters that cannot appear within a character class
expression unescaped.
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<span class="summary-type"> </span>
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<a name="__package__"></a><span class="summary-name">__package__</span> = <code title="'pyxb.utils'"><code class="variable-quote">'</code><code class="variable-string">pyxb.utils</code><code class="variable-quote">'</code></code>
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<!-- ==================== FUNCTION DETAILS ==================== -->
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<a name="_MatchCharPropBraced"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">_MatchCharPropBraced</span>(<span class="sig-arg">text</span>,
<span class="sig-arg">position</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="pyxb.utils.xmlre-pysrc.html#_MatchCharPropBraced">source code</a></span>
</td>
</tr></table>
<p>Match a <a href="http://www.w3.org/TR/xmlschema-2/#nt-catEsc"
target="_top">character property</a> or <a
href="http://www.w3.org/TR/xmlschema-2/#nt-MultiCharEsc"
target="_top">multi-character escape</a> identifier, which will be
enclosed in braces.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>text</code></strong> - The complete text of the regular expression being translated</li>
<li><strong class="pname"><code>position</code></strong> - The offset of the opening brace of the character property</li>
</ul></dd>
<dt>Returns:</dt>
<dd>A pair <code>(cps, p)</code> where <code>cps</code> is a <a
href="pyxb.utils.unicode.CodePointSet-class.html"
class="link">unicode.CodePointSet</a> containing the code points
associated with the property, and <code>p</code> is the text
offset immediately following the closing brace.</dd>
<dt>Raises:</dt>
<dd><ul class="nomargin-top">
<li><code><strong class='fraise'><a href="pyxb.utils.xmlre.RegularExpressionError-class.html">RegularExpressionError</a></strong></code> - if opening or closing braces are missing, or if the text between
them cannot be recognized as a property or block identifier.</li>
</ul></dd>
</dl>
</td></tr></table>
</div>
<a name="_MaybeMatchCharClassEsc"></a>
<div class="private">
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
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<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">_MaybeMatchCharClassEsc</span>(<span class="sig-arg">text</span>,
<span class="sig-arg">position</span>,
<span class="sig-arg">include_sce</span>=<span class="sig-default">True</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="pyxb.utils.xmlre-pysrc.html#_MaybeMatchCharClassEsc">source code</a></span>
</td>
</tr></table>
<p>Attempt to match a <a
href="http://www.w3.org/TR/xmlschema-2/#nt-charClassEsc"
target="_top">character class escape</a> expression.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>text</code></strong> - The complete text of the regular expression being translated</li>
<li><strong class="pname"><code>position</code></strong> - The offset of the backslash that would begin the potential
character class escape</li>
<li><strong class="pname"><code>include_sce</code></strong> - Optional directive to include single-character escapes in
addition to character cllass escapes. Default is
<code>True</code>.</li>
</ul></dd>
<dt>Returns:</dt>
<dd><code>None</code> if <code>position</code> does not begin a
character class escape; otherwise a pair <code>(cps, p)</code> as
in _MatchCharPropBraced.</dd>
</dl>
</td></tr></table>
</div>
<a name="_CharOrSCE"></a>
<div class="private">
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cellspacing="0" width="100%" bgcolor="white">
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<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">_CharOrSCE</span>(<span class="sig-arg">text</span>,
<span class="sig-arg">position</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="pyxb.utils.xmlre-pysrc.html#_CharOrSCE">source code</a></span>
</td>
</tr></table>
<p>Return the single character represented at the given position.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>text</code></strong> - The complete text of the regular expression being translated</li>
<li><strong class="pname"><code>position</code></strong> - The offset of the character to return. If this is a backslash,
additional text is consumed in order to identify the <a
href="http://www.w3.org/TR/xmlschema-2/#nt-SingleCharEsc"
target="_top">single-character escape</a> that begins at the
position.</li>
</ul></dd>
<dt>Returns:</dt>
<dd>A pair <code>(c, p)</code> where <code>c</code> is the Unicode
character specified at the position, and <code>p</code> is the
text offset immediately following the closing brace.</dd>
<dt>Raises:</dt>
<dd><ul class="nomargin-top">
<li><code><strong class='fraise'><a href="pyxb.utils.xmlre.RegularExpressionError-class.html">RegularExpressionError</a></strong></code> - if the position has no character, or has a character in <a
href="pyxb.utils.xmlre-module.html#_NotXMLChar_set" class="link"
onclick="show_private();">_NotXMLChar_set</a> or the position
begins an escape sequence that is not resolvable as a
single-character escape.</li>
</ul></dd>
</dl>
</td></tr></table>
</div>
<a name="_MatchPosCharGroup"></a>
<div class="private">
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">_MatchPosCharGroup</span>(<span class="sig-arg">text</span>,
<span class="sig-arg">position</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="pyxb.utils.xmlre-pysrc.html#_MatchPosCharGroup">source code</a></span>
</td>
</tr></table>
<p>Match a <a href="http://www.w3.org/TR/xmlschema-2/#nt-posCharGroup"
target="_top">positive character group</a> that begins at the given
position.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>text</code></strong> - The complete text of the regular expression being translated</li>
<li><strong class="pname"><code>position</code></strong> - The offset of the start of the positive character group.</li>
</ul></dd>
<dt>Returns:</dt>
<dd>a pair <code>(cps, p)</code> as in _MatchCharPropBraced.</dd>
<dt>Raises:</dt>
<dd><ul class="nomargin-top">
<li><code><strong class='fraise'><a href="pyxb.utils.xmlre.RegularExpressionError-class.html">RegularExpressionError</a></strong></code> - if the expression is syntactically invalid.</li>
</ul></dd>
</dl>
</td></tr></table>
</div>
<a name="_MatchCharGroup"></a>
<div class="private">
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">_MatchCharGroup</span>(<span class="sig-arg">text</span>,
<span class="sig-arg">position</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="pyxb.utils.xmlre-pysrc.html#_MatchCharGroup">source code</a></span>
</td>
</tr></table>
<p>Match a <a href="http://www.w3.org/TR/xmlschema-2/#nt-charGroup"
target="_top">character group</a> at the given position.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>text</code></strong> - The complete text of the regular expression being translated</li>
<li><strong class="pname"><code>position</code></strong> - The offset of the start of the character group.</li>
</ul></dd>
<dt>Returns:</dt>
<dd>a pair <code>(cps, p)</code> as in _MatchCharPropBraced.</dd>
<dt>Raises:</dt>
<dd><ul class="nomargin-top">
<li><code><strong class='fraise'><a href="pyxb.utils.xmlre.RegularExpressionError-class.html">RegularExpressionError</a></strong></code> - if the expression is syntactically invalid.</li>
</ul></dd>
</dl>
</td></tr></table>
</div>
<a name="_MatchCharClassExpr"></a>
<div class="private">
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">_MatchCharClassExpr</span>(<span class="sig-arg">text</span>,
<span class="sig-arg">position</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="pyxb.utils.xmlre-pysrc.html#_MatchCharClassExpr">source code</a></span>
</td>
</tr></table>
<p>Match a <a href="http://www.w3.org/TR/xmlschema-2/#nt-charClassExpr"
target="_top">character class expression</a> at the given position.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>text</code></strong> - The complete text of the regular expression being translated</li>
<li><strong class="pname"><code>position</code></strong> - The offset of the start of the character group.</li>
</ul></dd>
<dt>Returns:</dt>
<dd>a pair <code>(cps, p)</code> as in _MatchCharPropBraced.</dd>
<dt>Raises:</dt>
<dd><ul class="nomargin-top">
<li><code><strong class='fraise'><a href="pyxb.utils.xmlre.RegularExpressionError-class.html">RegularExpressionError</a></strong></code> - if the expression is syntactically invalid.</li>
</ul></dd>
</dl>
</td></tr></table>
</div>
<a name="MaybeMatchCharacterClass"></a>
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<tr><td>
<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">MaybeMatchCharacterClass</span>(<span class="sig-arg">text</span>,
<span class="sig-arg">position</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="pyxb.utils.xmlre-pysrc.html#MaybeMatchCharacterClass">source code</a></span>
</td>
</tr></table>
<p>Attempt to match a <a
href="http://www.w3.org/TR/xmlschema-2/#nt-charClassExpr"
target="_top">character class expression</a>.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>text</code></strong> - The complete text of the regular expression being translated</li>
<li><strong class="pname"><code>position</code></strong> - The offset of the start of the potential expression.</li>
</ul></dd>
<dt>Returns:</dt>
<dd><code>None</code> if <code>position</code> does not begin a
character class expression; otherwise a pair <code>(cps,
p)</code> as in _MatchCharPropBraced.</dd>
</dl>
</td></tr></table>
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<a name="XMLToPython"></a>
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cellspacing="0" width="100%" bgcolor="white">
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<h3 class="epydoc"><span class="sig"><span class="sig-name">XMLToPython</span>(<span class="sig-arg">pattern</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="pyxb.utils.xmlre-pysrc.html#XMLToPython">source code</a></span>
</td>
</tr></table>
<p>Convert the given pattern to the format required for Python regular
expressions.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>pattern</code></strong> - A Unicode string defining a pattern consistent with <a
href="http://www.w3.org/TR/xmlschema-2/index.html#regexs"
target="_top">XML regular expressions</a>.</li>
</ul></dd>
<dt>Returns:</dt>
<dd>A Unicode string specifying a Python regular expression that
matches the same language as <code>pattern</code>.</dd>
</dl>
</td></tr></table>
</div>
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