Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / XmlUtils / System / Xml / Xsl / Xslt / XPathPatternParser.cs / 1305376 / XPathPatternParser.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- using System.Collections.Generic; using System.Diagnostics; using System.Xml; using System.Xml.Xsl.Qil; using System.Xml.Xsl.XPath; namespace System.Xml.Xsl.Xslt { using XPathParser = XPathParser; using XPathNodeType = System.Xml.XPath.XPathNodeType; using Res = System.Xml.Utils.Res; internal class XPathPatternParser { public interface IPatternBuilder : IXPathBuilder { IXPathBuilder GetPredicateBuilder(QilNode context); } XPathScanner scanner; IPatternBuilder ptrnBuilder; XPathParser predicateParser = new XPathParser(); public QilNode Parse(XPathScanner scanner, IPatternBuilder ptrnBuilder) { Debug.Assert(this.scanner == null && this.ptrnBuilder == null); Debug.Assert(scanner != null && ptrnBuilder != null); QilNode result = null; ptrnBuilder.StartBuild(); try { this.scanner = scanner; this.ptrnBuilder = ptrnBuilder; result = this.ParsePattern(); this.scanner.CheckToken(LexKind.Eof); } finally { result = ptrnBuilder.EndBuild(result); #if DEBUG this.ptrnBuilder = null; this.scanner = null; #endif } return result; } /* * Pattern ::= LocationPathPattern ('|' LocationPathPattern)* */ private QilNode ParsePattern() { QilNode opnd = ParseLocationPathPattern(); while (scanner.Kind == LexKind.Union) { scanner.NextLex(); opnd = ptrnBuilder.Operator(XPathOperator.Union, opnd, ParseLocationPathPattern()); } return opnd; } /* * LocationPathPattern ::= '/' RelativePathPattern? | '//'? RelativePathPattern | IdKeyPattern (('/' | '//') RelativePathPattern)? */ private QilNode ParseLocationPathPattern() { QilNode opnd; switch (scanner.Kind) { case LexKind.Slash : scanner.NextLex(); opnd = ptrnBuilder.Axis(XPathAxis.Root, XPathNodeType.All, null, null); if (XPathParser.IsStep(scanner.Kind)) { opnd = ptrnBuilder.JoinStep(opnd, ParseRelativePathPattern()); } return opnd; case LexKind.SlashSlash : scanner.NextLex(); return ptrnBuilder.JoinStep( ptrnBuilder.Axis(XPathAxis.Root, XPathNodeType.All, null, null), ptrnBuilder.JoinStep( ptrnBuilder.Axis(XPathAxis.DescendantOrSelf, XPathNodeType.All, null, null), ParseRelativePathPattern() ) ); case LexKind.Name : if (scanner.CanBeFunction && scanner.Prefix.Length == 0 && (scanner.Name == "id" || scanner.Name == "key")) { opnd = ParseIdKeyPattern(); switch (scanner.Kind) { case LexKind.Slash : scanner.NextLex(); opnd = ptrnBuilder.JoinStep(opnd, ParseRelativePathPattern()); break; case LexKind.SlashSlash : scanner.NextLex(); opnd = ptrnBuilder.JoinStep(opnd, ptrnBuilder.JoinStep( ptrnBuilder.Axis(XPathAxis.DescendantOrSelf, XPathNodeType.All, null, null), ParseRelativePathPattern() ) ); break; } return opnd; } break; } opnd = ParseRelativePathPattern(); return opnd; } /* * IdKeyPattern ::= 'id' '(' Literal ')' | 'key' '(' Literal ',' Literal ')' */ private QilNode ParseIdKeyPattern() { Debug.Assert(scanner.CanBeFunction); Debug.Assert(scanner.Prefix.Length == 0); Debug.Assert(scanner.Name == "id" || scanner.Name == "key"); List args = new List (2); if (scanner.Name == "id") { scanner.NextLex(); scanner.PassToken(LexKind.LParens); scanner.CheckToken(LexKind.String); args.Add(ptrnBuilder.String(scanner.StringValue)); scanner.NextLex(); scanner.PassToken(LexKind.RParens); return ptrnBuilder.Function("", "id", args); } else { scanner.NextLex(); scanner.PassToken(LexKind.LParens); scanner.CheckToken(LexKind.String); args.Add(ptrnBuilder.String(scanner.StringValue)); scanner.NextLex(); scanner.PassToken(LexKind.Comma); scanner.CheckToken(LexKind.String); args.Add(ptrnBuilder.String(scanner.StringValue)); scanner.NextLex(); scanner.PassToken(LexKind.RParens); return ptrnBuilder.Function("", "key", args); } } /* * RelativePathPattern ::= StepPattern (('/' | '//') StepPattern)* */ private QilNode ParseRelativePathPattern() { QilNode opnd = ParseStepPattern(); if (scanner.Kind == LexKind.Slash) { scanner.NextLex(); opnd = ptrnBuilder.JoinStep(opnd, ParseRelativePathPattern()); } else if (scanner.Kind == LexKind.SlashSlash) { scanner.NextLex(); opnd = ptrnBuilder.JoinStep(opnd, ptrnBuilder.JoinStep( ptrnBuilder.Axis(XPathAxis.DescendantOrSelf, XPathNodeType.All, null, null), ParseRelativePathPattern() ) ); } return opnd; } /* * StepPattern ::= ChildOrAttributeAxisSpecifier NodeTest Predicate* * ChildOrAttributeAxisSpecifier ::= @ ? | ('child' | 'attribute') '::' */ private QilNode ParseStepPattern() { QilNode opnd; XPathAxis axis; switch (scanner.Kind) { case LexKind.Dot: case LexKind.DotDot: throw scanner.CreateException(Res.XPath_InvalidAxisInPattern); case LexKind.At: axis = XPathAxis.Attribute; scanner.NextLex(); break; case LexKind.Axis: axis = scanner.Axis; if (axis != XPathAxis.Child && axis != XPathAxis.Attribute) { throw scanner.CreateException(Res.XPath_InvalidAxisInPattern); } scanner.NextLex(); // Skip '::' scanner.NextLex(); break; case LexKind.Name: case LexKind.Star: // NodeTest must start with Name or '*' axis = XPathAxis.Child; break; default: throw scanner.CreateException(Res.XPath_UnexpectedToken, scanner.RawValue); } XPathNodeType nodeType; string nodePrefix, nodeName; XPathParser.InternalParseNodeTest(scanner, axis, out nodeType, out nodePrefix, out nodeName); opnd = ptrnBuilder.Axis(axis, nodeType, nodePrefix, nodeName); while (scanner.Kind == LexKind.LBracket) { opnd = ptrnBuilder.Predicate(opnd, ParsePredicate(opnd), /*reverseStep:*/false); } return opnd; } /* * Predicate ::= '[' Expr ']' */ private QilNode ParsePredicate(QilNode context) { Debug.Assert(scanner.Kind == LexKind.LBracket); scanner.NextLex(); QilNode result = predicateParser.Parse(scanner, ptrnBuilder.GetPredicateBuilder(context), LexKind.RBracket); Debug.Assert(scanner.Kind == LexKind.RBracket); scanner.NextLex(); return result; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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