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308 lines
8.6 KiB
PHP
308 lines
8.6 KiB
PHP
<?php
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namespace Sabre\Xml;
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use XMLReader;
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/**
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* The Reader class expands upon PHP's built-in XMLReader.
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*
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* The intended usage, is to assign certain XML elements to PHP classes. These
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* need to be registered using the $elementMap public property.
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*
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* After this is done, a single call to parse() will parse the entire document,
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* and delegate sub-sections of the document to element classes.
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*
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* @copyright Copyright (C) 2009-2015 fruux GmbH (https://fruux.com/).
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* @author Evert Pot (http://evertpot.com/)
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* @license http://sabre.io/license/ Modified BSD License
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*/
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class Reader extends XMLReader {
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use ContextStackTrait;
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/**
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* Returns the current nodename in clark-notation.
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*
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* For example: "{http://www.w3.org/2005/Atom}feed".
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* Or if no namespace is defined: "{}feed".
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*
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* This method returns null if we're not currently on an element.
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*
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* @return string|null
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*/
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function getClark() {
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if (! $this->localName) {
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return null;
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}
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return '{' . $this->namespaceURI . '}' . $this->localName;
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}
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/**
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* Reads the entire document.
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*
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* This function returns an array with the following three elements:
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* * name - The root element name.
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* * value - The value for the root element.
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* * attributes - An array of attributes.
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*
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* This function will also disable the standard libxml error handler (which
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* usually just results in PHP errors), and throw exceptions instead.
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*
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* @return array
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*/
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function parse() {
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$previousEntityState = libxml_disable_entity_loader(true);
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$previousSetting = libxml_use_internal_errors(true);
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// Really sorry about the silence operator, seems like I have no
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// choice. See:
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//
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// https://bugs.php.net/bug.php?id=64230
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while ($this->nodeType !== self::ELEMENT && @$this->read()) {
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// noop
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}
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$result = $this->parseCurrentElement();
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$errors = libxml_get_errors();
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libxml_clear_errors();
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libxml_use_internal_errors($previousSetting);
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libxml_disable_entity_loader($previousEntityState);
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if ($errors) {
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throw new LibXMLException($errors);
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}
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return $result;
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}
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/**
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* parseGetElements parses everything in the current sub-tree,
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* and returns a an array of elements.
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*
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* Each element has a 'name', 'value' and 'attributes' key.
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*
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* If the the element didn't contain sub-elements, an empty array is always
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* returned. If there was any text inside the element, it will be
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* discarded.
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*
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* If the $elementMap argument is specified, the existing elementMap will
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* be overridden while parsing the tree, and restored after this process.
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*
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* @param array $elementMap
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* @return array
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*/
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function parseGetElements(array $elementMap = null) {
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$result = $this->parseInnerTree($elementMap);
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if (!is_array($result)) {
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return [];
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}
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return $result;
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}
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/**
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* Parses all elements below the current element.
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*
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* This method will return a string if this was a text-node, or an array if
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* there were sub-elements.
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*
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* If there's both text and sub-elements, the text will be discarded.
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*
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* If the $elementMap argument is specified, the existing elementMap will
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* be overridden while parsing the tree, and restored after this process.
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*
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* @param array $elementMap
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* @return array|string
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*/
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function parseInnerTree(array $elementMap = null) {
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$text = null;
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$elements = [];
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if ($this->nodeType === self::ELEMENT && $this->isEmptyElement) {
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// Easy!
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$this->next();
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return null;
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}
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if (!is_null($elementMap)) {
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$this->pushContext();
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$this->elementMap = $elementMap;
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}
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// Really sorry about the silence operator, seems like I have no
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// choice. See:
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//
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// https://bugs.php.net/bug.php?id=64230
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if (!@$this->read()) return false;
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while (true) {
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if (!$this->isValid()) {
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$errors = libxml_get_errors();
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if ($errors) {
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libxml_clear_errors();
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throw new LibXMLException($errors);
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}
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}
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switch ($this->nodeType) {
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case self::ELEMENT :
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$elements[] = $this->parseCurrentElement();
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break;
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case self::TEXT :
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case self::CDATA :
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$text .= $this->value;
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$this->read();
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break;
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case self::END_ELEMENT :
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// Ensuring we are moving the cursor after the end element.
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$this->read();
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break 2;
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case self::NONE :
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throw new ParseException('We hit the end of the document prematurely. This likely means that some parser "eats" too many elements. Do not attempt to continue parsing.');
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default :
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// Advance to the next element
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$this->read();
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break;
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}
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}
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if (!is_null($elementMap)) {
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$this->popContext();
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}
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return ($elements ? $elements : $text);
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}
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/**
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* Reads all text below the current element, and returns this as a string.
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*
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* @return string
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*/
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function readText() {
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$result = '';
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$previousDepth = $this->depth;
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while ($this->read() && $this->depth != $previousDepth) {
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if (in_array($this->nodeType, [XMLReader::TEXT, XMLReader::CDATA, XMLReader::WHITESPACE])) {
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$result .= $this->value;
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}
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}
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return $result;
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}
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/**
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* Parses the current XML element.
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*
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* This method returns arn array with 3 properties:
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* * name - A clark-notation XML element name.
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* * value - The parsed value.
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* * attributes - A key-value list of attributes.
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*
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* @return array
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*/
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function parseCurrentElement() {
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$name = $this->getClark();
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$attributes = [];
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if ($this->hasAttributes) {
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$attributes = $this->parseAttributes();
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}
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$value = call_user_func(
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$this->getDeserializerForElementName($name),
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$this
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);
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return [
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'name' => $name,
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'value' => $value,
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'attributes' => $attributes,
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];
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}
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/**
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* Grabs all the attributes from the current element, and returns them as a
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* key-value array.
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*
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* If the attributes are part of the same namespace, they will simply be
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* short keys. If they are defined on a different namespace, the attribute
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* name will be retured in clark-notation.
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*
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* @return array
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*/
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function parseAttributes() {
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$attributes = [];
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while ($this->moveToNextAttribute()) {
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if ($this->namespaceURI) {
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// Ignoring 'xmlns', it doesn't make any sense.
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if ($this->namespaceURI === 'http://www.w3.org/2000/xmlns/') {
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continue;
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}
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$name = $this->getClark();
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$attributes[$name] = $this->value;
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} else {
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$attributes[$this->localName] = $this->value;
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}
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}
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$this->moveToElement();
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return $attributes;
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}
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/**
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* Returns the function that should be used to parse the element identified
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* by it's clark-notation name.
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*
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* @param string $name
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* @return callable
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*/
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function getDeserializerForElementName($name) {
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if (!array_key_exists($name, $this->elementMap)) {
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return ['Sabre\\Xml\\Element\\Base', 'xmlDeserialize'];
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}
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$deserializer = $this->elementMap[$name];
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if (is_subclass_of($deserializer, 'Sabre\\Xml\\XmlDeserializable')) {
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return [ $deserializer, 'xmlDeserialize' ];
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}
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if (is_callable($deserializer)) {
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return $deserializer;
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}
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$type = gettype($deserializer);
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if ($type === 'string') {
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$type .= ' (' . $deserializer . ')';
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} elseif ($type === 'object') {
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$type .= ' (' . get_class($deserializer) . ')';
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}
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throw new \LogicException('Could not use this type as a deserializer: ' . $type . ' for element: ' . $name);
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}
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}
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