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authorArseny Kapoulkine <arseny.kapoulkine@gmail.com>2015-04-10 22:26:57 -0700
committerArseny Kapoulkine <arseny.kapoulkine@gmail.com>2015-04-10 22:26:57 -0700
commite90d2ac8ba44fbcf4d5702643f708f2c86bde42e (patch)
treea52fe8e4efee8176da169998c203c1a93f6a6ff1 /docs/manual/loading.html
parent6457f0941204a79ec5ba359a12aa00bf06f0e621 (diff)
parent405fefc8777c55900a4e44561b545a9abb5276ba (diff)
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-<html>
-<head>
-<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
-<title>Loading document</title>
-<link rel="stylesheet" href="../pugixml.css" type="text/css">
-<meta name="generator" content="DocBook XSL Stylesheets V1.78.1">
-<link rel="home" href="../manual.html" title="pugixml 1.5">
-<link rel="up" href="../manual.html" title="pugixml 1.5">
-<link rel="prev" href="dom.html" title="Document object model">
-<link rel="next" href="access.html" title="Accessing document data">
-</head>
-<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
-<table width="100%"><tr>
-<td>
-<a href="http://pugixml.org/">pugixml 1.5</a> manual |
- <a href="../manual.html">Overview</a> |
- <a href="install.html">Installation</a> |
- Document:
- <a href="dom.html">Object model</a> &middot; <b>Loading</b> &middot; <a href="access.html">Accessing</a> &middot; <a href="modify.html">Modifying</a> &middot; <a href="saving.html">Saving</a> |
- <a href="xpath.html">XPath</a> |
- <a href="apiref.html">API Reference</a> |
- <a href="toc.html">Table of Contents</a>
-</td>
-<td width="*" align="right"><div class="spirit-nav">
-<a accesskey="p" href="dom.html"><img src="../images/prev.png" alt="Prev"></a><a accesskey="u" href="../manual.html"><img src="../images/up.png" alt="Up"></a><a accesskey="h" href="../manual.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="access.html"><img src="../images/next.png" alt="Next"></a>
-</div></td>
-</tr></table>
-<hr>
-<div class="section">
-<div class="titlepage"><div><div><h2 class="title" style="clear: both">
-<a name="manual.loading"></a><a class="link" href="loading.html" title="Loading document"> Loading document</a>
-</h2></div></div></div>
-<div class="toc"><dl class="toc">
-<dt><span class="section"><a href="loading.html#manual.loading.file"> Loading document from file</a></span></dt>
-<dt><span class="section"><a href="loading.html#manual.loading.memory"> Loading document from memory</a></span></dt>
-<dt><span class="section"><a href="loading.html#manual.loading.stream"> Loading document from C++ IOstreams</a></span></dt>
-<dt><span class="section"><a href="loading.html#manual.loading.errors"> Handling parsing errors</a></span></dt>
-<dt><span class="section"><a href="loading.html#manual.loading.options"> Parsing options</a></span></dt>
-<dt><span class="section"><a href="loading.html#manual.loading.encoding"> Encodings</a></span></dt>
-<dt><span class="section"><a href="loading.html#manual.loading.w3c"> Conformance to W3C specification</a></span></dt>
-</dl></div>
-<p>
- pugixml provides several functions for loading XML data from various places
- - files, C++ iostreams, memory buffers. All functions use an extremely fast
- non-validating parser. This parser is not fully W3C conformant - it can load
- any valid XML document, but does not perform some well-formedness checks. While
- considerable effort is made to reject invalid XML documents, some validation
- is not performed for performance reasons. Also some XML transformations (i.e.
- EOL handling or attribute value normalization) can impact parsing speed and
- thus can be disabled. However for vast majority of XML documents there is no
- performance difference between different parsing options. Parsing options also
- control whether certain XML nodes are parsed; see <a class="xref" href="loading.html#manual.loading.options" title="Parsing options"> Parsing options</a> for
- more information.
- </p>
-<p>
- XML data is always converted to internal character format (see <a class="xref" href="dom.html#manual.dom.unicode" title="Unicode interface"> Unicode interface</a>)
- before parsing. pugixml supports all popular Unicode encodings (UTF-8, UTF-16
- (big and little endian), UTF-32 (big and little endian); UCS-2 is naturally
- supported since it's a strict subset of UTF-16) and handles all encoding conversions
- automatically. Unless explicit encoding is specified, loading functions perform
- automatic encoding detection based on first few characters of XML data, so
- in almost all cases you do not have to specify document encoding. Encoding
- conversion is described in more detail in <a class="xref" href="loading.html#manual.loading.encoding" title="Encodings"> Encodings</a>.
- </p>
-<div class="section">
-<div class="titlepage"><div><div><h3 class="title">
-<a name="manual.loading.file"></a><a class="link" href="loading.html#manual.loading.file" title="Loading document from file"> Loading document from file</a>
-</h3></div></div></div>
-<a name="xml_document::load_file"></a><a name="xml_document::load_file_wide"></a><p>
- The most common source of XML data is files; pugixml provides dedicated functions
- for loading an XML document from file:
- </p>
-<pre class="programlisting"><span class="identifier">xml_parse_result</span> <span class="identifier">xml_document</span><span class="special">::</span><span class="identifier">load_file</span><span class="special">(</span><span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">path</span><span class="special">,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">options</span> <span class="special">=</span> <span class="identifier">parse_default</span><span class="special">,</span> <span class="identifier">xml_encoding</span> <span class="identifier">encoding</span> <span class="special">=</span> <span class="identifier">encoding_auto</span><span class="special">);</span>
-<span class="identifier">xml_parse_result</span> <span class="identifier">xml_document</span><span class="special">::</span><span class="identifier">load_file</span><span class="special">(</span><span class="keyword">const</span> <span class="keyword">wchar_t</span><span class="special">*</span> <span class="identifier">path</span><span class="special">,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">options</span> <span class="special">=</span> <span class="identifier">parse_default</span><span class="special">,</span> <span class="identifier">xml_encoding</span> <span class="identifier">encoding</span> <span class="special">=</span> <span class="identifier">encoding_auto</span><span class="special">);</span>
-</pre>
-<p>
- These functions accept the file path as its first argument, and also two
- optional arguments, which specify parsing options (see <a class="xref" href="loading.html#manual.loading.options" title="Parsing options"> Parsing options</a>)
- and input data encoding (see <a class="xref" href="loading.html#manual.loading.encoding" title="Encodings"> Encodings</a>). The path has the target
- operating system format, so it can be a relative or absolute one, it should
- have the delimiters of the target system, it should have the exact case if
- the target file system is case-sensitive, etc.
- </p>
-<p>
- File path is passed to the system file opening function as is in case of
- the first function (which accepts <code class="computeroutput"><span class="keyword">const</span>
- <span class="keyword">char</span><span class="special">*</span> <span class="identifier">path</span></code>); the second function either uses
- a special file opening function if it is provided by the runtime library
- or converts the path to UTF-8 and uses the system file opening function.
- </p>
-<p>
- <code class="computeroutput"><span class="identifier">load_file</span></code> destroys the existing
- document tree and then tries to load the new tree from the specified file.
- The result of the operation is returned in an <a class="link" href="loading.html#xml_parse_result">xml_parse_result</a>
- object; this object contains the operation status and the related information
- (i.e. last successfully parsed position in the input file, if parsing fails).
- See <a class="xref" href="loading.html#manual.loading.errors" title="Handling parsing errors"> Handling parsing errors</a> for error handling details.
- </p>
-<p>
- This is an example of loading XML document from file (<a href="../samples/load_file.cpp" target="_top">samples/load_file.cpp</a>):
- </p>
-<p>
-
-</p>
-<pre class="programlisting"><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_document</span> <span class="identifier">doc</span><span class="special">;</span>
-
-<span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_parse_result</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">load_file</span><span class="special">(</span><span class="string">"tree.xml"</span><span class="special">);</span>
-
-<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"Load result: "</span> <span class="special">&lt;&lt;</span> <span class="identifier">result</span><span class="special">.</span><span class="identifier">description</span><span class="special">()</span> <span class="special">&lt;&lt;</span> <span class="string">", mesh name: "</span> <span class="special">&lt;&lt;</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">child</span><span class="special">(</span><span class="string">"mesh"</span><span class="special">).</span><span class="identifier">attribute</span><span class="special">(</span><span class="string">"name"</span><span class="special">).</span><span class="identifier">value</span><span class="special">()</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
-</pre>
-<p>
- </p>
-</div>
-<div class="section">
-<div class="titlepage"><div><div><h3 class="title">
-<a name="manual.loading.memory"></a><a class="link" href="loading.html#manual.loading.memory" title="Loading document from memory"> Loading document from memory</a>
-</h3></div></div></div>
-<a name="xml_document::load_buffer"></a><a name="xml_document::load_buffer_inplace"></a><a name="xml_document::load_buffer_inplace_own"></a><p>
- Sometimes XML data should be loaded from some other source than a file, i.e.
- HTTP URL; also you may want to load XML data from file using non-standard
- functions, i.e. to use your virtual file system facilities or to load XML
- from gzip-compressed files. All these scenarios require loading document
- from memory. First you should prepare a contiguous memory block with all
- XML data; then you have to invoke one of buffer loading functions. These
- functions will handle the necessary encoding conversions, if any, and then
- will parse the data into the corresponding XML tree. There are several buffer
- loading functions, which differ in the behavior and thus in performance/memory
- usage:
- </p>
-<pre class="programlisting"><span class="identifier">xml_parse_result</span> <span class="identifier">xml_document</span><span class="special">::</span><span class="identifier">load_buffer</span><span class="special">(</span><span class="keyword">const</span> <span class="keyword">void</span><span class="special">*</span> <span class="identifier">contents</span><span class="special">,</span> <span class="identifier">size_t</span> <span class="identifier">size</span><span class="special">,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">options</span> <span class="special">=</span> <span class="identifier">parse_default</span><span class="special">,</span> <span class="identifier">xml_encoding</span> <span class="identifier">encoding</span> <span class="special">=</span> <span class="identifier">encoding_auto</span><span class="special">);</span>
-<span class="identifier">xml_parse_result</span> <span class="identifier">xml_document</span><span class="special">::</span><span class="identifier">load_buffer_inplace</span><span class="special">(</span><span class="keyword">void</span><span class="special">*</span> <span class="identifier">contents</span><span class="special">,</span> <span class="identifier">size_t</span> <span class="identifier">size</span><span class="special">,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">options</span> <span class="special">=</span> <span class="identifier">parse_default</span><span class="special">,</span> <span class="identifier">xml_encoding</span> <span class="identifier">encoding</span> <span class="special">=</span> <span class="identifier">encoding_auto</span><span class="special">);</span>
-<span class="identifier">xml_parse_result</span> <span class="identifier">xml_document</span><span class="special">::</span><span class="identifier">load_buffer_inplace_own</span><span class="special">(</span><span class="keyword">void</span><span class="special">*</span> <span class="identifier">contents</span><span class="special">,</span> <span class="identifier">size_t</span> <span class="identifier">size</span><span class="special">,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">options</span> <span class="special">=</span> <span class="identifier">parse_default</span><span class="special">,</span> <span class="identifier">xml_encoding</span> <span class="identifier">encoding</span> <span class="special">=</span> <span class="identifier">encoding_auto</span><span class="special">);</span>
-</pre>
-<p>
- All functions accept the buffer which is represented by a pointer to XML
- data, <code class="computeroutput"><span class="identifier">contents</span></code>, and data
- size in bytes. Also there are two optional arguments, which specify parsing
- options (see <a class="xref" href="loading.html#manual.loading.options" title="Parsing options"> Parsing options</a>) and input data encoding (see <a class="xref" href="loading.html#manual.loading.encoding" title="Encodings"> Encodings</a>).
- The buffer does not have to be zero-terminated.
- </p>
-<p>
- <code class="computeroutput"><span class="identifier">load_buffer</span></code> function works
- with immutable buffer - it does not ever modify the buffer. Because of this
- restriction it has to create a private buffer and copy XML data to it before
- parsing (applying encoding conversions if necessary). This copy operation
- carries a performance penalty, so inplace functions are provided - <code class="computeroutput"><span class="identifier">load_buffer_inplace</span></code> and <code class="computeroutput"><span class="identifier">load_buffer_inplace_own</span></code>
- store the document data in the buffer, modifying it in the process. In order
- for the document to stay valid, you have to make sure that the buffer's lifetime
- exceeds that of the tree if you're using inplace functions. In addition to
- that, <code class="computeroutput"><span class="identifier">load_buffer_inplace</span></code>
- does not assume ownership of the buffer, so you'll have to destroy it yourself;
- <code class="computeroutput"><span class="identifier">load_buffer_inplace_own</span></code> assumes
- ownership of the buffer and destroys it once it is not needed. This means
- that if you're using <code class="computeroutput"><span class="identifier">load_buffer_inplace_own</span></code>,
- you have to allocate memory with pugixml allocation function (you can get
- it via <a class="link" href="dom.html#get_memory_allocation_function">get_memory_allocation_function</a>).
- </p>
-<p>
- The best way from the performance/memory point of view is to load document
- using <code class="computeroutput"><span class="identifier">load_buffer_inplace_own</span></code>;
- this function has maximum control of the buffer with XML data so it is able
- to avoid redundant copies and reduce peak memory usage while parsing. This
- is the recommended function if you have to load the document from memory
- and performance is critical.
- </p>
-<a name="xml_document::load_string"></a><p>
- There is also a simple helper function for cases when you want to load the
- XML document from null-terminated character string:
- </p>
-<pre class="programlisting"><span class="identifier">xml_parse_result</span> <span class="identifier">xml_document</span><span class="special">::</span><span class="identifier">load_string</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">char_t</span><span class="special">*</span> <span class="identifier">contents</span><span class="special">,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">options</span> <span class="special">=</span> <span class="identifier">parse_default</span><span class="special">);</span>
-</pre>
-<p>
- It is equivalent to calling <code class="computeroutput"><span class="identifier">load_buffer</span></code>
- with <code class="computeroutput"><span class="identifier">size</span></code> being either <code class="computeroutput"><span class="identifier">strlen</span><span class="special">(</span><span class="identifier">contents</span><span class="special">)</span></code>
- or <code class="computeroutput"><span class="identifier">wcslen</span><span class="special">(</span><span class="identifier">contents</span><span class="special">)</span> <span class="special">*</span> <span class="keyword">sizeof</span><span class="special">(</span><span class="keyword">wchar_t</span><span class="special">)</span></code>,
- depending on the character type. This function assumes native encoding for
- input data, so it does not do any encoding conversion. In general, this function
- is fine for loading small documents from string literals, but has more overhead
- and less functionality than the buffer loading functions.
- </p>
-<p>
- This is an example of loading XML document from memory using different functions
- (<a href="../samples/load_memory.cpp" target="_top">samples/load_memory.cpp</a>):
- </p>
-<p>
-
-</p>
-<pre class="programlisting"><span class="keyword">const</span> <span class="keyword">char</span> <span class="identifier">source</span><span class="special">[]</span> <span class="special">=</span> <span class="string">"&lt;mesh name='sphere'&gt;&lt;bounds&gt;0 0 1 1&lt;/bounds&gt;&lt;/mesh&gt;"</span><span class="special">;</span>
-<span class="identifier">size_t</span> <span class="identifier">size</span> <span class="special">=</span> <span class="keyword">sizeof</span><span class="special">(</span><span class="identifier">source</span><span class="special">);</span>
-</pre>
-<p>
- </p>
-<p>
-
-</p>
-<pre class="programlisting"><span class="comment">// You can use load_buffer to load document from immutable memory block:
-</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_parse_result</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">load_buffer</span><span class="special">(</span><span class="identifier">source</span><span class="special">,</span> <span class="identifier">size</span><span class="special">);</span>
-</pre>
-<p>
- </p>
-<p>
-
-</p>
-<pre class="programlisting"><span class="comment">// You can use load_buffer_inplace to load document from mutable memory block; the block's lifetime must exceed that of document
-</span><span class="keyword">char</span><span class="special">*</span> <span class="identifier">buffer</span> <span class="special">=</span> <span class="keyword">new</span> <span class="keyword">char</span><span class="special">[</span><span class="identifier">size</span><span class="special">];</span>
-<span class="identifier">memcpy</span><span class="special">(</span><span class="identifier">buffer</span><span class="special">,</span> <span class="identifier">source</span><span class="special">,</span> <span class="identifier">size</span><span class="special">);</span>
-
-<span class="comment">// The block can be allocated by any method; the block is modified during parsing
-</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_parse_result</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">load_buffer_inplace</span><span class="special">(</span><span class="identifier">buffer</span><span class="special">,</span> <span class="identifier">size</span><span class="special">);</span>
-
-<span class="comment">// You have to destroy the block yourself after the document is no longer used
-</span><span class="keyword">delete</span><span class="special">[]</span> <span class="identifier">buffer</span><span class="special">;</span>
-</pre>
-<p>
- </p>
-<p>
-
-</p>
-<pre class="programlisting"><span class="comment">// You can use load_buffer_inplace_own to load document from mutable memory block and to pass the ownership of this block
-</span><span class="comment">// The block has to be allocated via pugixml allocation function - using i.e. operator new here is incorrect
-</span><span class="keyword">char</span><span class="special">*</span> <span class="identifier">buffer</span> <span class="special">=</span> <span class="keyword">static_cast</span><span class="special">&lt;</span><span class="keyword">char</span><span class="special">*&gt;(</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">get_memory_allocation_function</span><span class="special">()(</span><span class="identifier">size</span><span class="special">));</span>
-<span class="identifier">memcpy</span><span class="special">(</span><span class="identifier">buffer</span><span class="special">,</span> <span class="identifier">source</span><span class="special">,</span> <span class="identifier">size</span><span class="special">);</span>
-
-<span class="comment">// The block will be deleted by the document
-</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_parse_result</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">load_buffer_inplace_own</span><span class="special">(</span><span class="identifier">buffer</span><span class="special">,</span> <span class="identifier">size</span><span class="special">);</span>
-</pre>
-<p>
- </p>
-<p>
-
-</p>
-<pre class="programlisting"><span class="comment">// You can use load to load document from null-terminated strings, for example literals:
-</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_parse_result</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">load_string</span><span class="special">(</span><span class="string">"&lt;mesh name='sphere'&gt;&lt;bounds&gt;0 0 1 1&lt;/bounds&gt;&lt;/mesh&gt;"</span><span class="special">);</span>
-</pre>
-<p>
- </p>
-</div>
-<div class="section">
-<div class="titlepage"><div><div><h3 class="title">
-<a name="manual.loading.stream"></a><a class="link" href="loading.html#manual.loading.stream" title="Loading document from C++ IOstreams"> Loading document from C++ IOstreams</a>
-</h3></div></div></div>
-<a name="xml_document::load_stream"></a><p>
- To enhance interoperability, pugixml provides functions for loading document
- from any object which implements C++ <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">istream</span></code>
- interface. This allows you to load documents from any standard C++ stream
- (i.e. file stream) or any third-party compliant implementation (i.e. Boost
- Iostreams). There are two functions, one works with narrow character streams,
- another handles wide character ones:
- </p>
-<pre class="programlisting"><span class="identifier">xml_parse_result</span> <span class="identifier">xml_document</span><span class="special">::</span><span class="identifier">load</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">istream</span><span class="special">&amp;</span> <span class="identifier">stream</span><span class="special">,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">options</span> <span class="special">=</span> <span class="identifier">parse_default</span><span class="special">,</span> <span class="identifier">xml_encoding</span> <span class="identifier">encoding</span> <span class="special">=</span> <span class="identifier">encoding_auto</span><span class="special">);</span>
-<span class="identifier">xml_parse_result</span> <span class="identifier">xml_document</span><span class="special">::</span><span class="identifier">load</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">wistream</span><span class="special">&amp;</span> <span class="identifier">stream</span><span class="special">,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">options</span> <span class="special">=</span> <span class="identifier">parse_default</span><span class="special">);</span>
-</pre>
-<p>
- <code class="computeroutput"><span class="identifier">load</span></code> with <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">istream</span></code>
- argument loads the document from stream from the current read position to
- the end, treating the stream contents as a byte stream of the specified encoding
- (with encoding autodetection as necessary). Thus calling <code class="computeroutput"><span class="identifier">xml_document</span><span class="special">::</span><span class="identifier">load</span></code>
- on an opened <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">ifstream</span></code> object is equivalent to calling
- <code class="computeroutput"><span class="identifier">xml_document</span><span class="special">::</span><span class="identifier">load_file</span></code>.
- </p>
-<p>
- <code class="computeroutput"><span class="identifier">load</span></code> with <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">wstream</span></code>
- argument treats the stream contents as a wide character stream (encoding
- is always <a class="link" href="loading.html#encoding_wchar">encoding_wchar</a>). Because
- of this, using <code class="computeroutput"><span class="identifier">load</span></code> with
- wide character streams requires careful (usually platform-specific) stream
- setup (i.e. using the <code class="computeroutput"><span class="identifier">imbue</span></code>
- function). Generally use of wide streams is discouraged, however it provides
- you the ability to load documents from non-Unicode encodings, i.e. you can
- load Shift-JIS encoded data if you set the correct locale.
- </p>
-<p>
- This is a simple example of loading XML document from file using streams
- (<a href="../samples/load_stream.cpp" target="_top">samples/load_stream.cpp</a>); read
- the sample code for more complex examples involving wide streams and locales:
- </p>
-<p>
-
-</p>
-<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">ifstream</span> <span class="identifier">stream</span><span class="special">(</span><span class="string">"weekly-utf-8.xml"</span><span class="special">);</span>
-<span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_parse_result</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">load</span><span class="special">(</span><span class="identifier">stream</span><span class="special">);</span>
-</pre>
-<p>
- </p>
-</div>
-<div class="section">
-<div class="titlepage"><div><div><h3 class="title">
-<a name="manual.loading.errors"></a><a class="link" href="loading.html#manual.loading.errors" title="Handling parsing errors"> Handling parsing errors</a>
-</h3></div></div></div>
-<a name="xml_parse_result"></a><p>
- All document loading functions return the parsing result via <code class="computeroutput"><span class="identifier">xml_parse_result</span></code> object. It contains parsing
- status, the offset of last successfully parsed character from the beginning
- of the source stream, and the encoding of the source stream:
- </p>
-<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">xml_parse_result</span>
-<span class="special">{</span>
- <span class="identifier">xml_parse_status</span> <span class="identifier">status</span><span class="special">;</span>
- <span class="identifier">ptrdiff_t</span> <span class="identifier">offset</span><span class="special">;</span>
- <span class="identifier">xml_encoding</span> <span class="identifier">encoding</span><span class="special">;</span>
-
- <span class="keyword">operator</span> <span class="keyword">bool</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
- <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">description</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
-<span class="special">};</span>
-</pre>
-<a name="xml_parse_status"></a><a name="xml_parse_result::status"></a><p>
- Parsing status is represented as the <code class="computeroutput"><span class="identifier">xml_parse_status</span></code>
- enumeration and can be one of the following:
- </p>
-<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
-<li class="listitem">
- <a name="status_ok"></a><code class="literal">status_ok</code> means that no error was encountered
- during parsing; the source stream represents the valid XML document which
- was fully parsed and converted to a tree. <br><br>
-
- </li>
-<li class="listitem">
- <a name="status_file_not_found"></a><code class="literal">status_file_not_found</code> is only
- returned by <code class="computeroutput"><span class="identifier">load_file</span></code>
- function and means that file could not be opened.
- </li>
-<li class="listitem">
- <a name="status_io_error"></a><code class="literal">status_io_error</code> is returned by <code class="computeroutput"><span class="identifier">load_file</span></code> function and by <code class="computeroutput"><span class="identifier">load</span></code> functions with <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">istream</span></code>/<code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">wstream</span></code> arguments; it means that some
- I/O error has occurred during reading the file/stream.
- </li>
-<li class="listitem">
- <a name="status_out_of_memory"></a><code class="literal">status_out_of_memory</code> means that
- there was not enough memory during some allocation; any allocation failure
- during parsing results in this error.
- </li>
-<li class="listitem">
- <a name="status_internal_error"></a><code class="literal">status_internal_error</code> means that
- something went horribly wrong; currently this error does not occur <br><br>
-
- </li>
-<li class="listitem">
- <a name="status_unrecognized_tag"></a><code class="literal">status_unrecognized_tag</code> means
- that parsing stopped due to a tag with either an empty name or a name
- which starts with incorrect character, such as <code class="literal">#</code>.
- </li>
-<li class="listitem">
- <a name="status_bad_pi"></a><code class="literal">status_bad_pi</code> means that parsing stopped
- due to incorrect document declaration/processing instruction
- </li>
-<li class="listitem">
- <a name="status_bad_comment"></a><code class="literal">status_bad_comment</code>, <a name="status_bad_cdata"></a><code class="literal">status_bad_cdata</code>,
- <a name="status_bad_doctype"></a><code class="literal">status_bad_doctype</code> and <a name="status_bad_pcdata"></a><code class="literal">status_bad_pcdata</code>
- mean that parsing stopped due to the invalid construct of the respective
- type
- </li>
-<li class="listitem">
- <a name="status_bad_start_element"></a><code class="literal">status_bad_start_element</code> means
- that parsing stopped because starting tag either had no closing <code class="computeroutput"><span class="special">&gt;</span></code> symbol or contained some incorrect
- symbol
- </li>
-<li class="listitem">
- <a name="status_bad_attribute"></a><code class="literal">status_bad_attribute</code> means that
- parsing stopped because there was an incorrect attribute, such as an
- attribute without value or with value that is not quoted (note that
- <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">node</span>
- <span class="identifier">attr</span><span class="special">=</span><span class="number">1</span><span class="special">&gt;</span></code> is
- incorrect in XML)
- </li>
-<li class="listitem">
- <a name="status_bad_end_element"></a><code class="literal">status_bad_end_element</code> means
- that parsing stopped because ending tag had incorrect syntax (i.e. extra
- non-whitespace symbols between tag name and <code class="computeroutput"><span class="special">&gt;</span></code>)
- </li>
-<li class="listitem">
- <a name="status_end_element_mismatch"></a><code class="literal">status_end_element_mismatch</code>
- means that parsing stopped because the closing tag did not match the
- opening one (i.e. <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">node</span><span class="special">&gt;&lt;/</span><span class="identifier">nedo</span><span class="special">&gt;</span></code>) or because some tag was not closed
- at all
- </li>
-<li class="listitem">
- <a name="status_no_document_element"></a><code class="literal">status_no_document_element</code>
- means that no element nodes were discovered during parsing; this usually
- indicates an empty or invalid document
- </li>
-</ul></div>
-<a name="xml_parse_result::description"></a><p>
- <code class="computeroutput"><span class="identifier">description</span><span class="special">()</span></code>
- member function can be used to convert parsing status to a string; the returned
- message is always in English, so you'll have to write your own function if
- you need a localized string. However please note that the exact messages
- returned by <code class="computeroutput"><span class="identifier">description</span><span class="special">()</span></code>
- function may change from version to version, so any complex status handling
- should be based on <code class="computeroutput"><span class="identifier">status</span></code>
- value. Note that <code class="computeroutput"><span class="identifier">description</span><span class="special">()</span></code> returns a <code class="computeroutput"><span class="keyword">char</span></code>
- string even in <code class="computeroutput"><span class="identifier">PUGIXML_WCHAR_MODE</span></code>;
- you'll have to call <a class="link" href="dom.html#as_wide">as_wide</a> to get the <code class="computeroutput"><span class="keyword">wchar_t</span></code> string.
- </p>
-<p>
- If parsing failed because the source data was not a valid XML, the resulting
- tree is not destroyed - despite the fact that load function returns error,
- you can use the part of the tree that was successfully parsed. Obviously,
- the last element may have an unexpected name/value; for example, if the attribute
- value does not end with the necessary quotation mark, like in <code class="literal">&lt;node
- attr="value&gt;some data&lt;/node&gt;</code> example, the value of
- attribute <code class="computeroutput"><span class="identifier">attr</span></code> will contain
- the string <code class="computeroutput"><span class="identifier">value</span><span class="special">&gt;</span><span class="identifier">some</span> <span class="identifier">data</span><span class="special">&lt;/</span><span class="identifier">node</span><span class="special">&gt;</span></code>.
- </p>
-<a name="xml_parse_result::offset"></a><p>
- In addition to the status code, parsing result has an <code class="computeroutput"><span class="identifier">offset</span></code>
- member, which contains the offset of last successfully parsed character if
- parsing failed because of an error in source data; otherwise <code class="computeroutput"><span class="identifier">offset</span></code> is 0. For parsing efficiency reasons,
- pugixml does not track the current line during parsing; this offset is in
- units of <a class="link" href="dom.html#char_t">pugi::char_t</a> (bytes for character
- mode, wide characters for wide character mode). Many text editors support
- 'Go To Position' feature - you can use it to locate the exact error position.
- Alternatively, if you're loading the document from memory, you can display
- the error chunk along with the error description (see the example code below).
- </p>
-<div class="caution"><table border="0" summary="Caution">
-<tr>
-<td rowspan="2" align="center" valign="top" width="25"><img alt="[Caution]" src="../images/caution.png"></td>
-<th align="left">Caution</th>
-</tr>
-<tr><td align="left" valign="top"><p>
- Offset is calculated in the XML buffer in native encoding; if encoding
- conversion is performed during parsing, offset can not be used to reliably
- track the error position.
- </p></td></tr>
-</table></div>
-<a name="xml_parse_result::encoding"></a><p>
- Parsing result also has an <code class="computeroutput"><span class="identifier">encoding</span></code>
- member, which can be used to check that the source data encoding was correctly
- guessed. It is equal to the exact encoding used during parsing (i.e. with
- the exact endianness); see <a class="xref" href="loading.html#manual.loading.encoding" title="Encodings"> Encodings</a> for more information.
- </p>
-<a name="xml_parse_result::bool"></a><p>
- Parsing result object can be implicitly converted to <code class="computeroutput"><span class="keyword">bool</span></code>;
- if you do not want to handle parsing errors thoroughly, you can just check
- the return value of load functions as if it was a <code class="computeroutput"><span class="keyword">bool</span></code>:
- <code class="computeroutput"><span class="keyword">if</span> <span class="special">(</span><span class="identifier">doc</span><span class="special">.</span><span class="identifier">load_file</span><span class="special">(</span><span class="string">"file.xml"</span><span class="special">))</span> <span class="special">{</span> <span class="special">...</span>
- <span class="special">}</span> <span class="keyword">else</span> <span class="special">{</span> <span class="special">...</span> <span class="special">}</span></code>.
- </p>
-<p>
- This is an example of handling loading errors (<a href="../samples/load_error_handling.cpp" target="_top">samples/load_error_handling.cpp</a>):
- </p>
-<p>
-
-</p>
-<pre class="programlisting"><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_document</span> <span class="identifier">doc</span><span class="special">;</span>
-<span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_parse_result</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">load_string</span><span class="special">(</span><span class="identifier">source</span><span class="special">);</span>
-
-<span class="keyword">if</span> <span class="special">(</span><span class="identifier">result</span><span class="special">)</span>
- <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"XML ["</span> <span class="special">&lt;&lt;</span> <span class="identifier">source</span> <span class="special">&lt;&lt;</span> <span class="string">"] parsed without errors, attr value: ["</span> <span class="special">&lt;&lt;</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">child</span><span class="special">(</span><span class="string">"node"</span><span class="special">).</span><span class="identifier">attribute</span><span class="special">(</span><span class="string">"attr"</span><span class="special">).</span><span class="identifier">value</span><span class="special">()</span> <span class="special">&lt;&lt;</span> <span class="string">"]\n\n"</span><span class="special">;</span>
-<span class="keyword">else</span>
-<span class="special">{</span>
- <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"XML ["</span> <span class="special">&lt;&lt;</span> <span class="identifier">source</span> <span class="special">&lt;&lt;</span> <span class="string">"] parsed with errors, attr value: ["</span> <span class="special">&lt;&lt;</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">child</span><span class="special">(</span><span class="string">"node"</span><span class="special">).</span><span class="identifier">attribute</span><span class="special">(</span><span class="string">"attr"</span><span class="special">).</span><span class="identifier">value</span><span class="special">()</span> <span class="special">&lt;&lt;</span> <span class="string">"]\n"</span><span class="special">;</span>
- <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"Error description: "</span> <span class="special">&lt;&lt;</span> <span class="identifier">result</span><span class="special">.</span><span class="identifier">description</span><span class="special">()</span> <span class="special">&lt;&lt;</span> <span class="string">"\n"</span><span class="special">;</span>
- <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"Error offset: "</span> <span class="special">&lt;&lt;</span> <span class="identifier">result</span><span class="special">.</span><span class="identifier">offset</span> <span class="special">&lt;&lt;</span> <span class="string">" (error at [..."</span> <span class="special">&lt;&lt;</span> <span class="special">(</span><span class="identifier">source</span> <span class="special">+</span> <span class="identifier">result</span><span class="special">.</span><span class="identifier">offset</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="string">"]\n\n"</span><span class="special">;</span>
-<span class="special">}</span>
-</pre>
-<p>
- </p>
-</div>
-<div class="section">
-<div class="titlepage"><div><div><h3 class="title">
-<a name="manual.loading.options"></a><a class="link" href="loading.html#manual.loading.options" title="Parsing options"> Parsing options</a>
-</h3></div></div></div>
-<p>
- All document loading functions accept the optional parameter <code class="computeroutput"><span class="identifier">options</span></code>. This is a bitmask that customizes
- the parsing process: you can select the node types that are parsed and various
- transformations that are performed with the XML text. Disabling certain transformations
- can improve parsing performance for some documents; however, the code for
- all transformations is very well optimized, and thus the majority of documents
- won't get any performance benefit. As a rule of thumb, only modify parsing
- flags if you want to get some nodes in the document that are excluded by
- default (i.e. declaration or comment nodes).
- </p>
-<div class="note"><table border="0" summary="Note">
-<tr>
-<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../images/note.png"></td>
-<th align="left">Note</th>
-</tr>
-<tr><td align="left" valign="top"><p>
- You should use the usual bitwise arithmetics to manipulate the bitmask:
- to enable a flag, use <code class="computeroutput"><span class="identifier">mask</span> <span class="special">|</span> <span class="identifier">flag</span></code>;
- to disable a flag, use <code class="computeroutput"><span class="identifier">mask</span> <span class="special">&amp;</span> <span class="special">~</span><span class="identifier">flag</span></code>.
- </p></td></tr>
-</table></div>
-<p>
- These flags control the resulting tree contents:
- </p>
-<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
-<li class="listitem">
- <a name="parse_declaration"></a><code class="literal">parse_declaration</code> determines if XML
- document declaration (node with type <a class="link" href="dom.html#node_declaration">node_declaration</a>)
- is to be put in DOM tree. If this flag is off, it is not put in the tree,
- but is still parsed and checked for correctness. This flag is <span class="bold"><strong>off</strong></span> by default. <br><br>
-
- </li>
-<li class="listitem">
- <a name="parse_doctype"></a><code class="literal">parse_doctype</code> determines if XML document
- type declaration (node with type <a class="link" href="dom.html#node_doctype">node_doctype</a>)
- is to be put in DOM tree. If this flag is off, it is not put in the tree,
- but is still parsed and checked for correctness. This flag is <span class="bold"><strong>off</strong></span> by default. <br><br>
-
- </li>
-<li class="listitem">
- <a name="parse_pi"></a><code class="literal">parse_pi</code> determines if processing instructions
- (nodes with type <a class="link" href="dom.html#node_pi">node_pi</a>) are to be put
- in DOM tree. If this flag is off, they are not put in the tree, but are
- still parsed and checked for correctness. Note that <code class="computeroutput"><span class="special">&lt;?</span><span class="identifier">xml</span> <span class="special">...?&gt;</span></code>
- (document declaration) is not considered to be a PI. This flag is <span class="bold"><strong>off</strong></span> by default. <br><br>
-
- </li>
-<li class="listitem">
- <a name="parse_comments"></a><code class="literal">parse_comments</code> determines if comments
- (nodes with type <a class="link" href="dom.html#node_comment">node_comment</a>) are
- to be put in DOM tree. If this flag is off, they are not put in the tree,
- but are still parsed and checked for correctness. This flag is <span class="bold"><strong>off</strong></span> by default. <br><br>
-
- </li>
-<li class="listitem">
- <a name="parse_cdata"></a><code class="literal">parse_cdata</code> determines if CDATA sections
- (nodes with type <a class="link" href="dom.html#node_cdata">node_cdata</a>) are to
- be put in DOM tree. If this flag is off, they are not put in the tree,
- but are still parsed and checked for correctness. This flag is <span class="bold"><strong>on</strong></span> by default. <br><br>
-
- </li>
-<li class="listitem">
- <a name="parse_trim_pcdata"></a><code class="literal">parse_trim_pcdata</code> determines if leading
- and trailing whitespace characters are to be removed from PCDATA nodes.
- While for some applications leading/trailing whitespace is significant,
- often the application only cares about the non-whitespace contents so
- it's easier to trim whitespace from text during parsing. This flag is
- <span class="bold"><strong>off</strong></span> by default. <br><br>
-
- </li>
-<li class="listitem">
- <a name="parse_ws_pcdata"></a><code class="literal">parse_ws_pcdata</code> determines if PCDATA
- nodes (nodes with type <a class="link" href="dom.html#node_pcdata">node_pcdata</a>)
- that consist only of whitespace characters are to be put in DOM tree.
- Often whitespace-only data is not significant for the application, and
- the cost of allocating and storing such nodes (both memory and speed-wise)
- can be significant. For example, after parsing XML string <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">node</span><span class="special">&gt;</span> <span class="special">&lt;</span><span class="identifier">a</span><span class="special">/&gt;</span> <span class="special">&lt;/</span><span class="identifier">node</span><span class="special">&gt;</span></code>, <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">node</span><span class="special">&gt;</span></code>
- element will have three children when <code class="computeroutput"><span class="identifier">parse_ws_pcdata</span></code>
- is set (child with type <a class="link" href="dom.html#node_pcdata">node_pcdata</a>
- and value <code class="computeroutput"><span class="string">" "</span></code>,
- child with type <a class="link" href="dom.html#node_element">node_element</a> and
- name <code class="computeroutput"><span class="string">"a"</span></code>, and another
- child with type <a class="link" href="dom.html#node_pcdata">node_pcdata</a> and value
- <code class="computeroutput"><span class="string">" "</span></code>), and only
- one child when <code class="computeroutput"><span class="identifier">parse_ws_pcdata</span></code>
- is not set. This flag is <span class="bold"><strong>off</strong></span> by default.
- <br><br>
-
- </li>
-<li class="listitem">
- <a name="parse_ws_pcdata_single"></a><code class="literal">parse_ws_pcdata_single</code> determines
- if whitespace-only PCDATA nodes that have no sibling nodes are to be
- put in DOM tree. In some cases application needs to parse the whitespace-only
- contents of nodes, i.e. <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">node</span><span class="special">&gt;</span>
- <span class="special">&lt;/</span><span class="identifier">node</span><span class="special">&gt;</span></code>, but is not interested in whitespace
- markup elsewhere. It is possible to use <a class="link" href="loading.html#parse_ws_pcdata">parse_ws_pcdata</a>
- flag in this case, but it results in excessive allocations and complicates
- document processing in some cases; this flag is intended to avoid that.
- As an example, after parsing XML string <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">node</span><span class="special">&gt;</span>
- <span class="special">&lt;</span><span class="identifier">a</span><span class="special">&gt;</span> <span class="special">&lt;/</span><span class="identifier">a</span><span class="special">&gt;</span> <span class="special">&lt;/</span><span class="identifier">node</span><span class="special">&gt;</span></code> with <code class="computeroutput"><span class="identifier">parse_ws_pcdata_single</span></code>
- flag set, <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">node</span><span class="special">&gt;</span></code> element will have one child <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">a</span><span class="special">&gt;</span></code>, and <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">a</span><span class="special">&gt;</span></code>
- element will have one child with type <a class="link" href="dom.html#node_pcdata">node_pcdata</a>
- and value <code class="computeroutput"><span class="string">" "</span></code>.
- This flag has no effect if <a class="link" href="loading.html#parse_ws_pcdata">parse_ws_pcdata</a>
- is enabled. This flag is <span class="bold"><strong>off</strong></span> by default.
- <br><br>
-
- </li>
-<li class="listitem">
- <a name="parse_fragment"></a><code class="literal">parse_fragment</code> determines if document
- should be treated as a fragment of a valid XML. Parsing document as a
- fragment leads to top-level PCDATA content (i.e. text that is not located
- inside a node) to be added to a tree, and additionally treats documents
- without element nodes as valid. This flag is <span class="bold"><strong>off</strong></span>
- by default.
- </li>
-</ul></div>
-<div class="caution"><table border="0" summary="Caution">
-<tr>
-<td rowspan="2" align="center" valign="top" width="25"><img alt="[Caution]" src="../images/caution.png"></td>
-<th align="left">Caution</th>
-</tr>
-<tr><td align="left" valign="top"><p>
- Using in-place parsing (<a class="link" href="loading.html#xml_document::load_buffer_inplace">load_buffer_inplace</a>)
- with <code class="computeroutput"><span class="identifier">parse_fragment</span></code> flag
- may result in the loss of the last character of the buffer if it is a part
- of PCDATA. Since PCDATA values are null-terminated strings, the only way
- to resolve this is to provide a null-terminated buffer as an input to
- <code class="computeroutput"><span class="identifier">load_buffer_inplace</span></code> - i.e.
- <code class="computeroutput"><span class="identifier">doc</span><span class="special">.</span><span class="identifier">load_buffer_inplace</span><span class="special">(</span><span class="string">"test\0"</span><span class="special">,</span>
- <span class="number">5</span><span class="special">,</span> <span class="identifier">pugi</span><span class="special">::</span><span class="identifier">parse_default</span> <span class="special">|</span>
- <span class="identifier">pugi</span><span class="special">::</span><span class="identifier">parse_fragment</span><span class="special">)</span></code>.
- </p></td></tr>
-</table></div>
-<p>
- These flags control the transformation of tree element contents:
- </p>
-<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
-<li class="listitem">
- <a name="parse_escapes"></a><code class="literal">parse_escapes</code> determines if character
- and entity references are to be expanded during the parsing process.
- Character references have the form <code class="literal">&amp;#...;</code> or
- <code class="literal">&amp;#x...;</code> (<code class="literal">...</code> is Unicode numeric
- representation of character in either decimal (<code class="literal">&amp;#...;</code>)
- or hexadecimal (<code class="literal">&amp;#x...;</code>) form), entity references
- are <code class="literal">&amp;lt;</code>, <code class="literal">&amp;gt;</code>, <code class="literal">&amp;amp;</code>,
- <code class="literal">&amp;apos;</code> and <code class="literal">&amp;quot;</code> (note
- that as pugixml does not handle DTD, the only allowed entities are predefined
- ones). If character/entity reference can not be expanded, it is left
- as is, so you can do additional processing later. Reference expansion
- is performed on attribute values and PCDATA content. This flag is <span class="bold"><strong>on</strong></span> by default. <br><br>
-
- </li>
-<li class="listitem">
- <a name="parse_eol"></a><code class="literal">parse_eol</code> determines if EOL handling (that
- is, replacing sequences <code class="computeroutput"><span class="number">0x0d</span> <span class="number">0x0a</span></code> by a single <code class="computeroutput"><span class="number">0x0a</span></code>
- character, and replacing all standalone <code class="computeroutput"><span class="number">0x0d</span></code>
- characters by <code class="computeroutput"><span class="number">0x0a</span></code>) is to
- be performed on input data (that is, comments contents, PCDATA/CDATA
- contents and attribute values). This flag is <span class="bold"><strong>on</strong></span>
- by default. <br><br>
-
- </li>
-<li class="listitem">
- <a name="parse_wconv_attribute"></a><code class="literal">parse_wconv_attribute</code> determines
- if attribute value normalization should be performed for all attributes.
- This means, that whitespace characters (new line, tab and space) are
- replaced with space (<code class="computeroutput"><span class="char">' '</span></code>).
- New line characters are always treated as if <a class="link" href="loading.html#parse_eol">parse_eol</a>
- is set, i.e. <code class="computeroutput"><span class="special">\</span><span class="identifier">r</span><span class="special">\</span><span class="identifier">n</span></code>
- is converted to a single space. This flag is <span class="bold"><strong>on</strong></span>
- by default. <br><br>
-
- </li>
-<li class="listitem">
- <a name="parse_wnorm_attribute"></a><code class="literal">parse_wnorm_attribute</code> determines
- if extended attribute value normalization should be performed for all
- attributes. This means, that after attribute values are normalized as
- if <a class="link" href="loading.html#parse_wconv_attribute">parse_wconv_attribute</a>
- was set, leading and trailing space characters are removed, and all sequences
- of space characters are replaced by a single space character. <a class="link" href="loading.html#parse_wconv_attribute">parse_wconv_attribute</a>
- has no effect if this flag is on. This flag is <span class="bold"><strong>off</strong></span>
- by default.
- </li>
-</ul></div>
-<div class="note"><table border="0" summary="Note">
-<tr>
-<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../images/note.png"></td>
-<th align="left">Note</th>
-</tr>
-<tr><td align="left" valign="top"><p>
- <code class="computeroutput"><span class="identifier">parse_wconv_attribute</span></code> option
- performs transformations that are required by W3C specification for attributes
- that are declared as <code class="literal">CDATA</code>; <a class="link" href="loading.html#parse_wnorm_attribute">parse_wnorm_attribute</a>
- performs transformations required for <code class="literal">NMTOKENS</code> attributes.
- In the absence of document type declaration all attributes should behave
- as if they are declared as <code class="literal">CDATA</code>, thus <a class="link" href="loading.html#parse_wconv_attribute">parse_wconv_attribute</a>
- is the default option.
- </p></td></tr>
-</table></div>
-<p>
- Additionally there are three predefined option masks:
- </p>
-<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
-<li class="listitem">
- <a name="parse_minimal"></a><code class="literal">parse_minimal</code> has all options turned
- off. This option mask means that pugixml does not add declaration nodes,
- document type declaration nodes, PI nodes, CDATA sections and comments
- to the resulting tree and does not perform any conversion for input data,
- so theoretically it is the fastest mode. However, as mentioned above,
- in practice <a class="link" href="loading.html#parse_default">parse_default</a> is usually
- equally fast. <br><br>
-
- </li>
-<li class="listitem">
- <a name="parse_default"></a><code class="literal">parse_default</code> is the default set of flags,
- i.e. it has all options set to their default values. It includes parsing
- CDATA sections (comments/PIs are not parsed), performing character and
- entity reference expansion, replacing whitespace characters with spaces
- in attribute values and performing EOL handling. Note, that PCDATA sections
- consisting only of whitespace characters are not parsed (by default)
- for performance reasons. <br><br>
-
- </li>
-<li class="listitem">
- <a name="parse_full"></a><code class="literal">parse_full</code> is the set of flags which adds
- nodes of all types to the resulting tree and performs default conversions
- for input data. It includes parsing CDATA sections, comments, PI nodes,
- document declaration node and document type declaration node, performing
- character and entity reference expansion, replacing whitespace characters
- with spaces in attribute values and performing EOL handling. Note, that
- PCDATA sections consisting only of whitespace characters are not parsed
- in this mode.
- </li>
-</ul></div>
-<p>
- This is an example of using different parsing options (<a href="../samples/load_options.cpp" target="_top">samples/load_options.cpp</a>):
- </p>
-<p>
-
-</p>
-<pre class="programlisting"><span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">source</span> <span class="special">=</span> <span class="string">"&lt;!--comment--&gt;&lt;node&gt;&amp;lt;&lt;/node&gt;"</span><span class="special">;</span>
-
-<span class="comment">// Parsing with default options; note that comment node is not added to the tree, and entity reference &amp;lt; is expanded
-</span><span class="identifier">doc</span><span class="special">.</span><span class="identifier">load_string</span><span class="special">(</span><span class="identifier">source</span><span class="special">);</span>
-<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"First node value: ["</span> <span class="special">&lt;&lt;</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">first_child</span><span class="special">().</span><span class="identifier">value</span><span class="special">()</span> <span class="special">&lt;&lt;</span> <span class="string">"], node child value: ["</span> <span class="special">&lt;&lt;</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">child_value</span><span class="special">(</span><span class="string">"node"</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="string">"]\n"</span><span class="special">;</span>
-
-<span class="comment">// Parsing with additional parse_comments option; comment node is now added to the tree
-</span><span class="identifier">doc</span><span class="special">.</span><span class="identifier">load_string</span><span class="special">(</span><span class="identifier">source</span><span class="special">,</span> <span class="identifier">pugi</span><span class="special">::</span><span class="identifier">parse_default</span> <span class="special">|</span> <span class="identifier">pugi</span><span class="special">::</span><span class="identifier">parse_comments</span><span class="special">);</span>
-<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"First node value: ["</span> <span class="special">&lt;&lt;</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">first_child</span><span class="special">().</span><span class="identifier">value</span><span class="special">()</span> <span class="special">&lt;&lt;</span> <span class="string">"], node child value: ["</span> <span class="special">&lt;&lt;</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">child_value</span><span class="special">(</span><span class="string">"node"</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="string">"]\n"</span><span class="special">;</span>
-
-<span class="comment">// Parsing with additional parse_comments option and without the (default) parse_escapes option; &amp;lt; is not expanded
-</span><span class="identifier">doc</span><span class="special">.</span><span class="identifier">load_string</span><span class="special">(</span><span class="identifier">source</span><span class="special">,</span> <span class="special">(</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">parse_default</span> <span class="special">|</span> <span class="identifier">pugi</span><span class="special">::</span><span class="identifier">parse_comments</span><span class="special">)</span> <span class="special">&amp;</span> <span class="special">~</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">parse_escapes</span><span class="special">);</span>
-<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"First node value: ["</span> <span class="special">&lt;&lt;</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">first_child</span><span class="special">().</span><span class="identifier">value</span><span class="special">()</span> <span class="special">&lt;&lt;</span> <span class="string">"], node child value: ["</span> <span class="special">&lt;&lt;</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">child_value</span><span class="special">(</span><span class="string">"node"</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="string">"]\n"</span><span class="special">;</span>
-
-<span class="comment">// Parsing with minimal option mask; comment node is not added to the tree, and &amp;lt; is not expanded
-</span><span class="identifier">doc</span><span class="special">.</span><span class="identifier">load_string</span><span class="special">(</span><span class="identifier">source</span><span class="special">,</span> <span class="identifier">pugi</span><span class="special">::</span><span class="identifier">parse_minimal</span><span class="special">);</span>
-<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"First node value: ["</span> <span class="special">&lt;&lt;</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">first_child</span><span class="special">().</span><span class="identifier">value</span><span class="special">()</span> <span class="special">&lt;&lt;</span> <span class="string">"], node child value: ["</span> <span class="special">&lt;&lt;</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">child_value</span><span class="special">(</span><span class="string">"node"</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="string">"]\n"</span><span class="special">;</span>
-</pre>
-<p>
- </p>
-</div>
-<div class="section">
-<div class="titlepage"><div><div><h3 class="title">
-<a name="manual.loading.encoding"></a><a class="link" href="loading.html#manual.loading.encoding" title="Encodings"> Encodings</a>
-</h3></div></div></div>
-<a name="xml_encoding"></a><p>
- pugixml supports all popular Unicode encodings (UTF-8, UTF-16 (big and little
- endian), UTF-32 (big and little endian); UCS-2 is naturally supported since
- it's a strict subset of UTF-16) and handles all encoding conversions. Most
- loading functions accept the optional parameter <code class="computeroutput"><span class="identifier">encoding</span></code>.
- This is a value of enumeration type <code class="computeroutput"><span class="identifier">xml_encoding</span></code>,
- that can have the following values:
- </p>
-<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
-<li class="listitem">
- <a name="encoding_auto"></a><code class="literal">encoding_auto</code> means that pugixml will
- try to guess the encoding based on source XML data. The algorithm is
- a modified version of the one presented in Appendix F.1 of XML recommendation;
- it tries to match the first few bytes of input data with the following
- patterns in strict order: <br><br>
- <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; ">
-<li class="listitem">
- If first four bytes match UTF-32 BOM (Byte Order Mark), encoding
- is assumed to be UTF-32 with the endianness equal to that of BOM;
- </li>
-<li class="listitem">
- If first two bytes match UTF-16 BOM, encoding is assumed to be
- UTF-16 with the endianness equal to that of BOM;
- </li>
-<li class="listitem">
- If first three bytes match UTF-8 BOM, encoding is assumed to be
- UTF-8;
- </li>
-<li class="listitem">
- If first four bytes match UTF-32 representation of <code class="literal">&lt;</code>,
- encoding is assumed to be UTF-32 with the corresponding endianness;
- </li>
-<li class="listitem">
- If first four bytes match UTF-16 representation of <code class="literal">&lt;?</code>,
- encoding is assumed to be UTF-16 with the corresponding endianness;
- </li>
-<li class="listitem">
- If first two bytes match UTF-16 representation of <code class="literal">&lt;</code>,
- encoding is assumed to be UTF-16 with the corresponding endianness
- (this guess may yield incorrect result, but it's better than UTF-8);
- </li>
-<li class="listitem">
- Otherwise encoding is assumed to be UTF-8. <br><br>
-
- </li>
-</ul></div>
- </li>
-<li class="listitem">
- <a name="encoding_utf8"></a><code class="literal">encoding_utf8</code> corresponds to UTF-8 encoding
- as defined in the Unicode standard; UTF-8 sequences with length equal
- to 5 or 6 are not standard and are rejected.
- </li>
-<li class="listitem">
- <a name="encoding_utf16_le"></a><code class="literal">encoding_utf16_le</code> corresponds to
- little-endian UTF-16 encoding as defined in the Unicode standard; surrogate
- pairs are supported.
- </li>
-<li class="listitem">
- <a name="encoding_utf16_be"></a><code class="literal">encoding_utf16_be</code> corresponds to
- big-endian UTF-16 encoding as defined in the Unicode standard; surrogate
- pairs are supported.
- </li>
-<li class="listitem">
- <a name="encoding_utf16"></a><code class="literal">encoding_utf16</code> corresponds to UTF-16
- encoding as defined in the Unicode standard; the endianness is assumed
- to be that of the target platform.
- </li>
-<li class="listitem">
- <a name="encoding_utf32_le"></a><code class="literal">encoding_utf32_le</code> corresponds to
- little-endian UTF-32 encoding as defined in the Unicode standard.
- </li>
-<li class="listitem">
- <a name="encoding_utf32_be"></a><code class="literal">encoding_utf32_be</code> corresponds to
- big-endian UTF-32 encoding as defined in the Unicode standard.
- </li>
-<li class="listitem">
- <a name="encoding_utf32"></a><code class="literal">encoding_utf32</code> corresponds to UTF-32
- encoding as defined in the Unicode standard; the endianness is assumed
- to be that of the target platform.
- </li>
-<li class="listitem">
- <a name="encoding_wchar"></a><code class="literal">encoding_wchar</code> corresponds to the encoding
- of <code class="computeroutput"><span class="keyword">wchar_t</span></code> type; it has
- the same meaning as either <code class="computeroutput"><span class="identifier">encoding_utf16</span></code>
- or <code class="computeroutput"><span class="identifier">encoding_utf32</span></code>, depending
- on <code class="computeroutput"><span class="keyword">wchar_t</span></code> size.
- </li>
-<li class="listitem">
- <a name="encoding_latin1"></a><code class="literal">encoding_latin1</code> corresponds to ISO-8859-1
- encoding (also known as Latin-1).
- </li>
-</ul></div>
-<p>
- The algorithm used for <code class="computeroutput"><span class="identifier">encoding_auto</span></code>
- correctly detects any supported Unicode encoding for all well-formed XML
- documents (since they start with document declaration) and for all other
- XML documents that start with <code class="literal">&lt;</code>; if your XML document
- does not start with <code class="literal">&lt;</code> and has encoding that is different
- from UTF-8, use the specific encoding.
- </p>
-<div class="note"><table border="0" summary="Note">
-<tr>
-<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../images/note.png"></td>
-<th align="left">Note</th>
-</tr>
-<tr><td align="left" valign="top"><p>
- The current behavior for Unicode conversion is to skip all invalid UTF
- sequences during conversion. This behavior should not be relied upon; moreover,
- in case no encoding conversion is performed, the invalid sequences are
- not removed, so you'll get them as is in node/attribute contents.
- </p></td></tr>
-</table></div>
-</div>
-<div class="section">
-<div class="titlepage"><div><div><h3 class="title">
-<a name="manual.loading.w3c"></a><a class="link" href="loading.html#manual.loading.w3c" title="Conformance to W3C specification"> Conformance to W3C specification</a>
-</h3></div></div></div>
-<p>
- pugixml is not fully W3C conformant - it can load any valid XML document,
- but does not perform some well-formedness checks. While considerable effort
- is made to reject invalid XML documents, some validation is not performed
- because of performance reasons.
- </p>
-<p>
- There is only one non-conformant behavior when dealing with valid XML documents:
- pugixml does not use information supplied in document type declaration for
- parsing. This means that entities declared in DOCTYPE are not expanded, and
- all attribute/PCDATA values are always processed in a uniform way that depends
- only on parsing options.
- </p>
-<p>
- As for rejecting invalid XML documents, there are a number of incompatibilities
- with W3C specification, including:
- </p>
-<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
-<li class="listitem">
- Multiple attributes of the same node can have equal names.
- </li>
-<li class="listitem">
- All non-ASCII characters are treated in the same way as symbols of English
- alphabet, so some invalid tag names are not rejected.
- </li>
-<li class="listitem">
- Attribute values which contain <code class="literal">&lt;</code> are not rejected.
- </li>
-<li class="listitem">
- Invalid entity/character references are not rejected and are instead
- left as is.
- </li>
-<li class="listitem">
- Comment values can contain <code class="literal">--</code>.
- </li>
-<li class="listitem">
- XML data is not required to begin with document declaration; additionally,
- document declaration can appear after comments and other nodes.
- </li>
-<li class="listitem">
- Invalid document type declarations are silently ignored in some cases.
- </li>
-</ul></div>
-</div>
-</div>
-<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
-<td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright &#169; 2014 Arseny Kapoulkine<p>
- Distributed under the MIT License
- </p>
-</div></td>
-</tr></table>
-<hr>
-<table width="100%"><tr>
-<td>
-<a href="http://pugixml.org/">pugixml 1.5</a> manual |
- <a href="../manual.html">Overview</a> |
- <a href="install.html">Installation</a> |
- Document:
- <a href="dom.html">Object model</a> &middot; <b>Loading</b> &middot; <a href="access.html">Accessing</a> &middot; <a href="modify.html">Modifying</a> &middot; <a href="saving.html">Saving</a> |
- <a href="xpath.html">XPath</a> |
- <a href="apiref.html">API Reference</a> |
- <a href="toc.html">Table of Contents</a>
-</td>
-<td width="*" align="right"><div class="spirit-nav">
-<a accesskey="p" href="dom.html"><img src="../images/prev.png" alt="Prev"></a><a accesskey="u" href="../manual.html"><img src="../images/up.png" alt="Up"></a><a accesskey="h" href="../manual.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="access.html"><img src="../images/next.png" alt="Next"></a>
-</div></td>
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