1 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 : /* ***** BEGIN LICENSE BLOCK *****
3 : * Version: MPL 1.1/GPL 2.0/LGPL 2.1
4 : *
5 : * The contents of this file are subject to the Mozilla Public License Version
6 : * 1.1 (the "License"); you may not use this file except in compliance with
7 : * the License. You may obtain a copy of the License at
8 : * http://www.mozilla.org/MPL/
9 : *
10 : * Software distributed under the License is distributed on an "AS IS" basis,
11 : * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12 : * for the specific language governing rights and limitations under the
13 : * License.
14 : *
15 : * The Original Code is TransforMiiX XSLT processor code.
16 : *
17 : * The Initial Developer of the Original Code is
18 : * The MITRE Corporation.
19 : * Portions created by the Initial Developer are Copyright (C) 1999
20 : * the Initial Developer. All Rights Reserved.
21 : *
22 : * Contributor(s):
23 : * Keith Visco <kvisco@ziplink.net> (Original Author)
24 : *
25 : * Alternatively, the contents of this file may be used under the terms of
26 : * either the GNU General Public License Version 2 or later (the "GPL"), or
27 : * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
28 : * in which case the provisions of the GPL or the LGPL are applicable instead
29 : * of those above. If you wish to allow use of your version of this file only
30 : * under the terms of either the GPL or the LGPL, and not to allow others to
31 : * use your version of this file under the terms of the MPL, indicate your
32 : * decision by deleting the provisions above and replace them with the notice
33 : * and other provisions required by the GPL or the LGPL. If you do not delete
34 : * the provisions above, a recipient may use your version of this file under
35 : * the terms of any one of the MPL, the GPL or the LGPL.
36 : *
37 : * ***** END LICENSE BLOCK ***** */
38 :
39 : /**
40 : * ExprParser
41 : * This class is used to parse XSL Expressions
42 : * @see ExprLexer
43 : **/
44 :
45 : #ifndef MITREXSL_EXPRPARSER_H
46 : #define MITREXSL_EXPRPARSER_H
47 :
48 : #include "txCore.h"
49 : #include "nsAutoPtr.h"
50 : #include "nsString.h"
51 :
52 : class AttributeValueTemplate;
53 : class Expr;
54 : class txExprLexer;
55 : class FunctionCall;
56 : class LocationStep;
57 : class nsIAtom;
58 : class PredicateList;
59 : class Token;
60 : class txIParseContext;
61 : class txNodeTest;
62 : class txNodeTypeTest;
63 :
64 : class txExprParser
65 : {
66 : public:
67 :
68 42 : static nsresult createExpr(const nsSubstring& aExpression,
69 : txIParseContext* aContext, Expr** aExpr)
70 : {
71 42 : return createExprInternal(aExpression, 0, aContext, aExpr);
72 : }
73 :
74 : /**
75 : * Creates an Attribute Value Template using the given value
76 : */
77 : static nsresult createAVT(const nsSubstring& aAttrValue,
78 : txIParseContext* aContext,
79 : Expr** aResult);
80 :
81 :
82 : protected:
83 : static nsresult createExprInternal(const nsSubstring& aExpression,
84 : PRUint32 aSubStringPos,
85 : txIParseContext* aContext,
86 : Expr** aExpr);
87 : /**
88 : * Using nsAutoPtr& to optimize passing the ownership to the
89 : * created binary expression objects.
90 : */
91 : static nsresult createBinaryExpr(nsAutoPtr<Expr>& left,
92 : nsAutoPtr<Expr>& right, Token* op,
93 : Expr** aResult);
94 : static nsresult createExpr(txExprLexer& lexer, txIParseContext* aContext,
95 : Expr** aResult);
96 : static nsresult createFilterOrStep(txExprLexer& lexer,
97 : txIParseContext* aContext,
98 : Expr** aResult);
99 : static nsresult createFunctionCall(txExprLexer& lexer,
100 : txIParseContext* aContext,
101 : Expr** aResult);
102 : static nsresult createLocationStep(txExprLexer& lexer,
103 : txIParseContext* aContext,
104 : Expr** aResult);
105 : static nsresult createNodeTypeTest(txExprLexer& lexer,
106 : txNodeTest** aResult);
107 : static nsresult createPathExpr(txExprLexer& lexer,
108 : txIParseContext* aContext,
109 : Expr** aResult);
110 : static nsresult createUnionExpr(txExprLexer& lexer,
111 : txIParseContext* aContext,
112 : Expr** aResult);
113 :
114 : static bool isLocationStepToken(Token* aToken);
115 :
116 : static short precedence(Token* aToken);
117 :
118 : /**
119 : * Resolve a QName, given the mContext parse context.
120 : * Returns prefix and localName as well as namespace ID
121 : */
122 : static nsresult resolveQName(const nsAString& aQName, nsIAtom** aPrefix,
123 : txIParseContext* aContext,
124 : nsIAtom** aLocalName, PRInt32& aNamespace,
125 : bool aIsNameTest = false);
126 :
127 : /**
128 : * Using the given lexer, parses the tokens if they represent a
129 : * predicate list
130 : * If an error occurs a non-zero String pointer will be returned
131 : * containing the error message.
132 : * @param predicateList, the PredicateList to add predicate expressions to
133 : * @param lexer the ExprLexer to use for parsing tokens
134 : * @return 0 if successful, or a String pointer to the error message
135 : */
136 : static nsresult parsePredicates(PredicateList* aPredicateList,
137 : txExprLexer& lexer,
138 : txIParseContext* aContext);
139 : static nsresult parseParameters(FunctionCall* aFnCall, txExprLexer& lexer,
140 : txIParseContext* aContext);
141 :
142 : };
143 :
144 : #endif
|