Adding GDataXMLNode sources.

.gitignore

@@ -2,5 +2,3 @@
 *.pbxuser
 *.mode1v3
 xcuserdata/
-GDataXMLNode.h
-GDataXMLNode.m

epub/GDataXMLNode.h

@@ -0,0 +1,221 @@
+/* Copyright (c) 2008 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// These node, element, and document classes implement a subset of the methods
+// provided by NSXML.  While NSXML behavior is mimicked as much as possible,
+// there are important differences.
+//
+// The biggest difference is that, since this is based on libxml2, there
+// is no retain model for the underlying node data.  Rather than copy every
+// node obtained from a parse tree (which would have a substantial memory
+// impact), we rely on weak references, and it is up to the code that
+// created a document to retain it for as long as any
+// references rely on nodes inside that document tree.
+
+
+#import <Foundation/Foundation.h>
+
+// libxml includes require that the target Header Search Paths contain
+//
+//   /usr/include/libxml2
+//
+// and Other Linker Flags contain
+//
+//   -lxml2
+
+#import <libxml/tree.h>
+#import <libxml/parser.h>
+#import <libxml/xmlstring.h>
+#import <libxml/xpath.h>
+#import <libxml/xpathInternals.h>
+
+
+#ifdef GDATA_TARGET_NAMESPACE
+  // we're using target namespace macros
+  #import "GDataDefines.h"
+#endif
+
+#undef _EXTERN
+#undef _INITIALIZE_AS
+#ifdef GDATAXMLNODE_DEFINE_GLOBALS
+#define _EXTERN
+#define _INITIALIZE_AS(x) =x
+#else
+#if defined(__cplusplus)
+#define _EXTERN extern "C"
+#else
+#define _EXTERN extern
+#endif
+#define _INITIALIZE_AS(x)
+#endif
+
+// when no namespace dictionary is supplied for XPath, the default namespace
+// for the evaluated tree is registered with the prefix _def_ns
+_EXTERN const char* kGDataXMLXPathDefaultNamespacePrefix _INITIALIZE_AS("_def_ns");
+
+// Nomenclature for method names:
+//
+// Node = GData node
+// XMLNode = xmlNodePtr
+//
+// So, for example:
+//  + (id)nodeConsumingXMLNode:(xmlNodePtr)theXMLNode;
+
+@class NSArray, NSDictionary, NSError, NSString, NSURL;
+@class GDataXMLElement, GDataXMLDocument;
+
+enum {
+  GDataXMLInvalidKind = 0,
+  GDataXMLDocumentKind,
+  GDataXMLElementKind,
+  GDataXMLAttributeKind,
+  GDataXMLNamespaceKind,
+  GDataXMLProcessingInstructionKind,
+  GDataXMLCommentKind,
+  GDataXMLTextKind,
+  GDataXMLDTDKind,
+  GDataXMLEntityDeclarationKind,
+  GDataXMLAttributeDeclarationKind,
+  GDataXMLElementDeclarationKind,
+  GDataXMLNotationDeclarationKind
+};
+
+typedef NSUInteger GDataXMLNodeKind;
+
+@interface GDataXMLNode : NSObject <NSCopying> {
+@protected
+  // NSXMLNodes can have a namespace URI or prefix even if not part
+  // of a tree; xmlNodes cannot.  When we create nodes apart from
+  // a tree, we'll store the dangling prefix or URI in the xmlNode's name,
+  // like
+  //   "prefix:name"
+  // or
+  //   "{http://uri}:name"
+  //
+  // We will fix up the node's namespace and name (and those of any children)
+  // later when adding the node to a tree with addChild: or addAttribute:.
+  // See fixUpNamespacesForNode:.
+
+  xmlNodePtr xmlNode_; // may also be an xmlAttrPtr or xmlNsPtr
+  BOOL shouldFreeXMLNode_; // if yes, xmlNode_ will be free'd in dealloc
+
+  // cached values
+  NSString *cachedName_;
+  NSArray *cachedChildren_;
+  NSArray *cachedAttributes_;
+}
+
++ (GDataXMLElement *)elementWithName:(NSString *)name;
++ (GDataXMLElement *)elementWithName:(NSString *)name stringValue:(NSString *)value;
++ (GDataXMLElement *)elementWithName:(NSString *)name URI:(NSString *)value;
+
++ (id)attributeWithName:(NSString *)name stringValue:(NSString *)value;
++ (id)attributeWithName:(NSString *)name URI:(NSString *)attributeURI stringValue:(NSString *)value;
+
++ (id)namespaceWithName:(NSString *)name stringValue:(NSString *)value;
+
++ (id)textWithStringValue:(NSString *)value;
+
+- (NSString *)stringValue;
+- (void)setStringValue:(NSString *)str;
+
+- (NSUInteger)childCount;
+- (NSArray *)children;
+- (GDataXMLNode *)childAtIndex:(unsigned)index;
+
+- (NSString *)localName;
+- (NSString *)name;
+- (NSString *)prefix;
+- (NSString *)URI;
+
+- (GDataXMLNodeKind)kind;
+
+- (NSString *)XMLString;
+
++ (NSString *)localNameForName:(NSString *)name;
++ (NSString *)prefixForName:(NSString *)name;
+
+// This is the preferred entry point for nodesForXPath.  This takes an explicit
+// namespace dictionary (keys are prefixes, values are URIs).
+- (NSArray *)nodesForXPath:(NSString *)xpath namespaces:(NSDictionary *)namespaces error:(NSError **)error;
+
+// This implementation of nodesForXPath registers namespaces only from the
+// document's root node.  _def_ns may be used as a prefix for the default
+// namespace, though there's no guarantee that the default namespace will
+// be consistenly the same namespace in server responses.
+- (NSArray *)nodesForXPath:(NSString *)xpath error:(NSError **)error;
+
+// access to the underlying libxml node; be sure to release the cached values
+// if you change the underlying tree at all
+- (xmlNodePtr)XMLNode;
+- (void)releaseCachedValues;
+
+@end
+
+
+@interface GDataXMLElement : GDataXMLNode
+
+- (id)initWithXMLString:(NSString *)str error:(NSError **)error;
+
+- (NSArray *)namespaces;
+- (void)setNamespaces:(NSArray *)namespaces;
+- (void)addNamespace:(GDataXMLNode *)aNamespace;
+
+// addChild adds a copy of the child node to the element
+- (void)addChild:(GDataXMLNode *)child;
+- (void)removeChild:(GDataXMLNode *)child;
+
+- (NSArray *)elementsForName:(NSString *)name;
+- (NSArray *)elementsForLocalName:(NSString *)localName URI:(NSString *)URI;
+
+- (NSArray *)attributes;
+- (GDataXMLNode *)attributeForName:(NSString *)name;
+- (GDataXMLNode *)attributeForLocalName:(NSString *)name URI:(NSString *)attributeURI;
+- (void)addAttribute:(GDataXMLNode *)attribute;
+
+- (NSString *)resolvePrefixForNamespaceURI:(NSString *)namespaceURI;
+
+@end
+
+@interface GDataXMLDocument : NSObject {
+@protected
+  xmlDoc* xmlDoc_; // strong; always free'd in dealloc
+}
+
+- (id)initWithXMLString:(NSString *)str options:(unsigned int)mask error:(NSError **)error;
+- (id)initWithData:(NSData *)data options:(unsigned int)mask error:(NSError **)error;
+
+// initWithRootElement uses a copy of the argument as the new document's root
+- (id)initWithRootElement:(GDataXMLElement *)element;
+
+- (GDataXMLElement *)rootElement;
+
+- (NSData *)XMLData;
+
+- (void)setVersion:(NSString *)version;
+- (void)setCharacterEncoding:(NSString *)encoding;
+
+// This is the preferred entry point for nodesForXPath.  This takes an explicit
+// namespace dictionary (keys are prefixes, values are URIs).
+- (NSArray *)nodesForXPath:(NSString *)xpath namespaces:(NSDictionary *)namespaces error:(NSError **)error;
+
+// This implementation of nodesForXPath registers namespaces only from the
+// document's root node.  _def_ns may be used as a prefix for the default
+// namespace, though there's no guarantee that the default namespace will
+// be consistenly the same namespace in server responses.
+- (NSArray *)nodesForXPath:(NSString *)xpath error:(NSError **)error;
+
+- (NSString *)description;
+@end