libxml2-xpathinternals.html

xml开源解析代码.版本为libxml2-2.6.29,可支持GB3212.网络消息发送XML时很有用.

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        <div class="refsect2" lang="en"><h3><a name="xmlXPathReturnBoolean">Macro </a>xmlXPathReturnBoolean</h3><pre class="programlisting">#define <a href="#xmlXPathReturnBoolean">xmlXPathReturnBoolean</a>(ctxt, val);
</pre><p>Pushes the boolean @val on the context stack.</p><div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>an XPath parser context</td></tr><tr><td><span class="term"><i><tt>val</tt></i>:</span></td><td>a boolean</td></tr></tbody></table></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathReturnEmptyNodeSet">Macro </a>xmlXPathReturnEmptyNodeSet</h3><pre class="programlisting">#define <a href="#xmlXPathReturnEmptyNodeSet">xmlXPathReturnEmptyNodeSet</a>(ctxt);
</pre><p>Pushes an empty node-set on the context stack.</p><div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>an XPath parser context</td></tr></tbody></table></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathReturnEmptyString">Macro </a>xmlXPathReturnEmptyString</h3><pre class="programlisting">#define <a href="#xmlXPathReturnEmptyString">xmlXPathReturnEmptyString</a>(ctxt);
</pre><p>Pushes an empty string on the stack.</p><div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>an XPath parser context</td></tr></tbody></table></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathReturnExternal">Macro </a>xmlXPathReturnExternal</h3><pre class="programlisting">#define <a href="#xmlXPathReturnExternal">xmlXPathReturnExternal</a>(ctxt, val);
</pre><p>Pushes user data on the context stack.</p><div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>an XPath parser context</td></tr><tr><td><span class="term"><i><tt>val</tt></i>:</span></td><td>user data</td></tr></tbody></table></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathReturnFalse">Macro </a>xmlXPathReturnFalse</h3><pre class="programlisting">#define <a href="#xmlXPathReturnFalse">xmlXPathReturnFalse</a>(ctxt);
</pre><p>Pushes false on the context stack.</p><div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>an XPath parser context</td></tr></tbody></table></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathReturnNodeSet">Macro </a>xmlXPathReturnNodeSet</h3><pre class="programlisting">#define <a href="#xmlXPathReturnNodeSet">xmlXPathReturnNodeSet</a>(ctxt, ns);
</pre><p>Pushes the node-set @ns on the context stack.</p><div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>an XPath parser context</td></tr><tr><td><span class="term"><i><tt>ns</tt></i>:</span></td><td>a node-set</td></tr></tbody></table></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathReturnNumber">Macro </a>xmlXPathReturnNumber</h3><pre class="programlisting">#define <a href="#xmlXPathReturnNumber">xmlXPathReturnNumber</a>(ctxt, val);
</pre><p>Pushes the double @val on the context stack.</p><div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>an XPath parser context</td></tr><tr><td><span class="term"><i><tt>val</tt></i>:</span></td><td>a double</td></tr></tbody></table></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathReturnString">Macro </a>xmlXPathReturnString</h3><pre class="programlisting">#define <a href="#xmlXPathReturnString">xmlXPathReturnString</a>(ctxt, str);
</pre><p>Pushes the string @str on the context stack.</p><div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>an XPath parser context</td></tr><tr><td><span class="term"><i><tt>str</tt></i>:</span></td><td>a string</td></tr></tbody></table></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathReturnTrue">Macro </a>xmlXPathReturnTrue</h3><pre class="programlisting">#define <a href="#xmlXPathReturnTrue">xmlXPathReturnTrue</a>(ctxt);
</pre><p>Pushes true on the context stack.</p><div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>an XPath parser context</td></tr></tbody></table></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathSetArityError">Macro </a>xmlXPathSetArityError</h3><pre class="programlisting">#define <a href="#xmlXPathSetArityError">xmlXPathSetArityError</a>(ctxt);
</pre><p>Raises an <a href="libxml2-xpath.html#XPATH_INVALID_ARITY">XPATH_INVALID_ARITY</a> error.</p><div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>an XPath parser context</td></tr></tbody></table></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathSetError">Macro </a>xmlXPathSetError</h3><pre class="programlisting">#define <a href="#xmlXPathSetError">xmlXPathSetError</a>(ctxt, err);
</pre><p>Raises an error.</p><div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>an XPath parser context</td></tr><tr><td><span class="term"><i><tt>err</tt></i>:</span></td><td>an <a href="libxml2-xpath.html#xmlXPathError">xmlXPathError</a> code</td></tr></tbody></table></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathSetTypeError">Macro </a>xmlXPathSetTypeError</h3><pre class="programlisting">#define <a href="#xmlXPathSetTypeError">xmlXPathSetTypeError</a>(ctxt);
</pre><p>Raises an <a href="libxml2-xpath.html#XPATH_INVALID_TYPE">XPATH_INVALID_TYPE</a> error.</p><div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>an XPath parser context</td></tr></tbody></table></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathStackIsExternal">Macro </a>xmlXPathStackIsExternal</h3><pre class="programlisting">#define <a href="#xmlXPathStackIsExternal">xmlXPathStackIsExternal</a>(ctxt);
</pre><p>Checks if the current value on the XPath stack is an external object. Returns true if the current object on the stack is an external object.</p><div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>an XPath parser context</td></tr></tbody></table></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathStackIsNodeSet">Macro </a>xmlXPathStackIsNodeSet</h3><pre class="programlisting">#define <a href="#xmlXPathStackIsNodeSet">xmlXPathStackIsNodeSet</a>(ctxt);
</pre><p>Check if the current value on the XPath stack is a node set or an XSLT value tree. Returns true if the current object on the stack is a node-set.</p><div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>an XPath parser context</td></tr></tbody></table></div>
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        <div class="refsect2" lang="en"><h3><a name="valuePop"/>valuePop ()</h3><pre class="programlisting"><a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a>	valuePop	(<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt)<br/>
</pre><p>Pops the top XPath object from the value stack</p>
<div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>an XPath evaluation context</td></tr><tr><td><span class="term"><i><tt>Returns</tt></i>:</span></td><td>the XPath object just removed</td></tr></tbody></table></div></div>
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        <div class="refsect2" lang="en"><h3><a name="valuePush"/>valuePush ()</h3><pre class="programlisting">int	valuePush			(<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/>					 <a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> value)<br/>
</pre><p>Pushes a new XPath object on top of the value stack</p>
<div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>an XPath evaluation context</td></tr><tr><td><span class="term"><i><tt>value</tt></i>:</span></td><td>the XPath object</td></tr><tr><td><span class="term"><i><tt>Returns</tt></i>:</span></td><td>the number of items on the value stack</td></tr></tbody></table></div></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathAddValues"/>xmlXPathAddValues ()</h3><pre class="programlisting">void	xmlXPathAddValues		(<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt)<br/>
</pre><p>Implement the add operation on XPath objects: The numeric operators convert their operands to numbers as if by calling the number function.</p>
<div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>the XPath Parser context</td></tr></tbody></table></div></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathBooleanFunction"/>xmlXPathBooleanFunction ()</h3><pre class="programlisting">void	xmlXPathBooleanFunction		(<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/>					 int nargs)<br/>
</pre><p>Implement the boolean() XPath function boolean boolean(object) The boolean function converts its argument to a boolean as follows: - a number is true if and only if it is neither positive or negative zero nor NaN - a node-set is true if and only if it is non-empty - a string is true if and only if its length is non-zero</p>
<div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>the XPath Parser context</td></tr><tr><td><span class="term"><i><tt>nargs</tt></i>:</span></td><td>the number of arguments</td></tr></tbody></table></div></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathCeilingFunction"/>xmlXPathCeilingFunction ()</h3><pre class="programlisting">void	xmlXPathCeilingFunction		(<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/>					 int nargs)<br/>
</pre><p>Implement the ceiling() XPath function number ceiling(number) The ceiling function returns the smallest (closest to negative infinity) number that is not less than the argument and that is an integer.</p>
<div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>the XPath Parser context</td></tr><tr><td><span class="term"><i><tt>nargs</tt></i>:</span></td><td>the number of arguments</td></tr></tbody></table></div></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathCompareValues"/>xmlXPathCompareValues ()</h3><pre class="programlisting">int	xmlXPathCompareValues		(<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/>					 int inf, <br/>					 int strict)<br/>
</pre><p>Implement the compare operation on XPath objects: @arg1 &lt; @arg2 (1, 1, ... @arg1 &lt;= @arg2 (1, 0, ... @arg1 &gt; @arg2 (0, 1, ... @arg1 &gt;= @arg2 (0, 0, ... When neither object to be compared is a node-set and the operator is &lt;=, &lt;, &gt;=, &gt;, then the objects are compared by converted both objects to numbers and comparing the numbers according to IEEE 754. The &lt; comparison will be true if and only if the first number is less than the second number. The &lt;= comparison will be true if and only if the first number is less than or equal to the second number. The &gt; comparison will be true if and only if the first number is greater than the second number. The &gt;= comparison will be true if and only if the first number is greater than or equal to the second number.</p>
<div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>the XPath Parser context</td></tr><tr><td><span class="term"><i><tt>inf</tt></i>:</span></td><td>less than (1) or greater than (0)</td></tr><tr><td><span class="term"><i><tt>strict</tt></i>:</span></td><td>is the comparison strict</td></tr><tr><td><span class="term"><i><tt>Returns</tt></i>:</span></td><td>1 if the comparison succeeded, 0 if it failed</td></tr></tbody></table></div></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathConcatFunction"/>xmlXPathConcatFunction ()</h3><pre class="programlisting">void	xmlXPathConcatFunction		(<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/>					 int nargs)<br/>
</pre><p>Implement the concat() XPath function string concat(string, string, string*) The concat function returns the concatenation of its arguments.</p>
<div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>the XPath Parser context</td></tr><tr><td><span class="term"><i><tt>nargs</tt></i>:</span></td><td>the number of arguments</td></tr></tbody></table></div></div>
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        <div class="refsect2" lang="en"><h3><a name="xmlXPathContainsFunction"/>xmlXPathContainsFunction ()</h3><pre class="programlisting">void	xmlXPathContainsFunction	(<a href="libxml2-xpath.html#xmlXPathParserContextPtr">xmlXPathParserContextPtr</a> ctxt, <br/>					 int nargs)<br/>