/src/mozilla-central/dom/xslt/xpath/txExprParser.h
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1 | | /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ |
2 | | /* This Source Code Form is subject to the terms of the Mozilla Public |
3 | | * License, v. 2.0. If a copy of the MPL was not distributed with this |
4 | | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
5 | | |
6 | | /** |
7 | | * ExprParser |
8 | | * This class is used to parse XSL Expressions |
9 | | * @see ExprLexer |
10 | | **/ |
11 | | |
12 | | #ifndef MITREXSL_EXPRPARSER_H |
13 | | #define MITREXSL_EXPRPARSER_H |
14 | | |
15 | | #include "txCore.h" |
16 | | #include "nsAutoPtr.h" |
17 | | #include "nsString.h" |
18 | | |
19 | | class Expr; |
20 | | class txExprLexer; |
21 | | class FunctionCall; |
22 | | class LocationStep; |
23 | | class nsAtom; |
24 | | class PredicateList; |
25 | | class Token; |
26 | | class txIParseContext; |
27 | | class txNodeTest; |
28 | | |
29 | | class txExprParser |
30 | | { |
31 | | public: |
32 | | |
33 | | static nsresult createExpr(const nsAString& aExpression, |
34 | | txIParseContext* aContext, Expr** aExpr) |
35 | 0 | { |
36 | 0 | return createExprInternal(aExpression, 0, aContext, aExpr); |
37 | 0 | } |
38 | | |
39 | | /** |
40 | | * Creates an Attribute Value Template using the given value |
41 | | */ |
42 | | static nsresult createAVT(const nsAString& aAttrValue, |
43 | | txIParseContext* aContext, |
44 | | Expr** aResult); |
45 | | |
46 | | |
47 | | protected: |
48 | | static nsresult createExprInternal(const nsAString& aExpression, |
49 | | uint32_t aSubStringPos, |
50 | | txIParseContext* aContext, |
51 | | Expr** aExpr); |
52 | | /** |
53 | | * Using nsAutoPtr& to optimize passing the ownership to the |
54 | | * created binary expression objects. |
55 | | */ |
56 | | static nsresult createBinaryExpr(nsAutoPtr<Expr>& left, |
57 | | nsAutoPtr<Expr>& right, Token* op, |
58 | | Expr** aResult); |
59 | | static nsresult createExpr(txExprLexer& lexer, txIParseContext* aContext, |
60 | | Expr** aResult); |
61 | | static nsresult createFilterOrStep(txExprLexer& lexer, |
62 | | txIParseContext* aContext, |
63 | | Expr** aResult); |
64 | | static nsresult createFunctionCall(txExprLexer& lexer, |
65 | | txIParseContext* aContext, |
66 | | Expr** aResult); |
67 | | static nsresult createLocationStep(txExprLexer& lexer, |
68 | | txIParseContext* aContext, |
69 | | Expr** aResult); |
70 | | static nsresult createNodeTypeTest(txExprLexer& lexer, |
71 | | txNodeTest** aResult); |
72 | | static nsresult createPathExpr(txExprLexer& lexer, |
73 | | txIParseContext* aContext, |
74 | | Expr** aResult); |
75 | | static nsresult createUnionExpr(txExprLexer& lexer, |
76 | | txIParseContext* aContext, |
77 | | Expr** aResult); |
78 | | |
79 | | static bool isLocationStepToken(Token* aToken); |
80 | | |
81 | | static short precedence(Token* aToken); |
82 | | |
83 | | /** |
84 | | * Resolve a QName, given the mContext parse context. |
85 | | * Returns prefix and localName as well as namespace ID |
86 | | */ |
87 | | static nsresult resolveQName(const nsAString& aQName, nsAtom** aPrefix, |
88 | | txIParseContext* aContext, |
89 | | nsAtom** aLocalName, int32_t& aNamespace, |
90 | | bool aIsNameTest = false); |
91 | | |
92 | | /** |
93 | | * Using the given lexer, parses the tokens if they represent a |
94 | | * predicate list |
95 | | * If an error occurs a non-zero String pointer will be returned |
96 | | * containing the error message. |
97 | | * @param predicateList, the PredicateList to add predicate expressions to |
98 | | * @param lexer the ExprLexer to use for parsing tokens |
99 | | * @return 0 if successful, or a String pointer to the error message |
100 | | */ |
101 | | static nsresult parsePredicates(PredicateList* aPredicateList, |
102 | | txExprLexer& lexer, |
103 | | txIParseContext* aContext); |
104 | | static nsresult parseParameters(FunctionCall* aFnCall, txExprLexer& lexer, |
105 | | txIParseContext* aContext); |
106 | | |
107 | | }; |
108 | | |
109 | | #endif |