mono/mcs/class/System.XML/System.Xml.Query/XQueryParser.jay

%{
//
// XQueryParser.jay
//
// Author:
//	Atsushi Enomoto <[email protected]>
//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

//
// FIXME:
//	attribute value template
//	handle double literal
//

#if NET_2_0

using System;
using System.Collections;
using System.IO;
using System.Xml;
using System.Xml.Query;
using System.Xml.Schema;
using System.Xml.XPath;
using System.Security.Policy;
using Mono.Xml.XPath2;
using Mono.Xml.XQuery;

namespace Mono.Xml.XQuery.Parser
{
	internal class XQueryParser
	{
		// FIXME: Wait for recommendation
		public const string XdtNamespace = "http://www.w3.org/2003/11/xpath-datatypes";

		// See also FunctionCall production rule.
		static Hashtable reservedFunctionNames;

		static XQueryParser ()
		{
			reservedFunctionNames = new Hashtable ();
			reservedFunctionNames.Add ("attribute", "attribute");
			reservedFunctionNames.Add ("comment", "comment");
			reservedFunctionNames.Add ("document", "document");
			reservedFunctionNames.Add ("element", "element");
			reservedFunctionNames.Add ("empty", "empty");
			reservedFunctionNames.Add ("if", "if");
			reservedFunctionNames.Add ("item", "item");
			reservedFunctionNames.Add ("node", "node");
			reservedFunctionNames.Add ("processing-instruction", "processing-instruction");
			reservedFunctionNames.Add ("text", "text");
			reservedFunctionNames.Add ("type", "type");
			reservedFunctionNames.Add ("typeswitch", "typeswitch");
		}

		public static XQueryModule Parse (TextReader reader)
		{
			return new XQueryParser ().RunParse (reader);
		}

		private XQueryTokenizer tokenizer;

		private XQueryParser ()
		{
		}

		// FIXME: we don't need Evidence here at all. It is used only
		// to generate runnable IL (on loading resulting Assembly).
		public XQueryModule RunParse (TextReader source)
		{
			tokenizer = null;
			try {
//				debug = new yydebug.yyDebugSimple ();
				tokenizer = new XQueryTokenizer (source);
				XQueryModule mod = (XQueryModule) yyparse (tokenizer);
				mod.NSResolver = tokenizer.NSResolver;
				return mod;
			} catch (yyParser.yyException ex) {
				throw new XmlQueryCompileException (String.Format ("Tokenizer error at line {0}, column {1}: {2}", tokenizer.LineNumber, tokenizer.LinePosition, ex.Message), ex);
			}
		}

		public XmlTypeCode GetAtomicTypeCode (XmlQualifiedName name)
		{
			if (name.Namespace == XdtNamespace) {
				switch (name.Name) {
				case "anyAtomicType":
					return XmlTypeCode.AnyAtomicType;
				case "dayTimeDuration":
					return XmlTypeCode.DayTimeDuration;
				case "item":
					return XmlTypeCode.Item;
				case "untypedAtomic":
					return XmlTypeCode.UntypedAtomic;
				case "yearMonthDuration":
					return XmlTypeCode.YearMonthDuration;
				}
			} else if (name.Namespace == XmlSchema.Namespace) {
				switch (name.Name) {
				case "boolean":
					return XmlTypeCode.Boolean;
				case "byte":
					return XmlTypeCode.Byte;
				case "date":
					return XmlTypeCode.Date;
				case "dateTime":
					return XmlTypeCode.DateTime;
				case "decimal":
					return XmlTypeCode.Decimal;
				case "double":
					return XmlTypeCode.Double;
				case "duration":
					return XmlTypeCode.Duration;
				case "entity":
					return XmlTypeCode.Entity;
				case "float":
					return XmlTypeCode.Float;
				case "gDay":
					return XmlTypeCode.GDay;
				case "gMonth":
					return XmlTypeCode.GMonth;
				case "gMonthDay":
					return XmlTypeCode.GMonthDay;
				case "gYear":
					return XmlTypeCode.GYear;
				case "gYearMonth":
					return XmlTypeCode.GYearMonth;
				case "hexBinary":
					return XmlTypeCode.HexBinary;
				case "id":
					return XmlTypeCode.Id;
				case "idref":
					return XmlTypeCode.Idref;
				case "int":
					return XmlTypeCode.Int;
				case "integer":
					return XmlTypeCode.Integer;
				case "language":
					return XmlTypeCode.Language;
				case "long":
					return XmlTypeCode.Long;
				case "Name":
					return XmlTypeCode.Name;
				case "NCName":
					return XmlTypeCode.NCName;
				case "negativeInteger":
					return XmlTypeCode.NegativeInteger;
				case "NMTOKEN":
					return XmlTypeCode.NmToken;
				case "nonNegativeInteger":
					return XmlTypeCode.NonNegativeInteger;
				case "nonPositiveInteger":
					return XmlTypeCode.NonPositiveInteger;
				case "normalizedString":
					return XmlTypeCode.NormalizedString;
				case "NOTATION":
					return XmlTypeCode.Notation;
				case "positiveInteger":
					return XmlTypeCode.PositiveInteger;
				case "QName":
					return XmlTypeCode.QName;
				case "short":
					return XmlTypeCode.Short;
				case "string":
					return XmlTypeCode.String;
				case "time":
					return XmlTypeCode.Time;
				case "token":
					return XmlTypeCode.Token;
				case "unsignedByte":
					return XmlTypeCode.UnsignedByte;
				case "unsignedInt":
					return XmlTypeCode.UnsignedInt;
				case "unsignedLong":
					return XmlTypeCode.UnsignedLong;
				case "unsignedShort":
					return XmlTypeCode.UnsignedShort;
				}
			}
			throw new XmlQueryCompileException (String.Format ("Unexpected type name was specified as atomic type: {0}", name));
		}

%}

/* --------------------------------------------------------
	Tokens
-------------------------------------------------------- */

/* These are for numbers */
//%token SMALL_E //"e"
//%token LARGE_E //"E"

%token DOT			"."
%token DOT2			".."
%token SEMICOLON		";"
%token OPEN_PAREN		"("
%token OPEN_PAREN_COLON		"(:"
%token PRAGMA_OPEN		"(::"
%token CLOSE_PAREN		")"
%token COLON			":"
%token COLON2			"::"
%token PRAGMA_CLOSE		"::)"
%token CLOSE_PAREN_COLON	":)"
%token COLON_EQUAL		":="
%token OPEN_BRACKET		"["
%token CLOSE_BRACKET		"]"
%token OPEN_CURLY		"{"
%token CLOSE_CURLY		"}"
%token COMMA			","
%token DOLLAR			"$"
%token EQUAL			"="
%token NOT_EQUAL		"!="
%token LESSER			"<"
%token LESSER2			"<<"
%token LESSER_EQUAL		"<="
%token GREATER			">"
%token GREATER2			">>"
%token GREATER_EQUAL		">="
%token BAR			"|"
%token ASTERISK			"*"
%token PLUS			"+"
%token MINUS			"-"
%token SLASH			"/"
%token SLASH2			"//"
%token QUESTION			"?"


%token XQUERY		//"xquery"
%token VERSION		//"version"
%token PRAGMA		//"pragma"
%token EXTENSION	//"extension"
%token MODULE		//"module"
%token NAMESPACE	//"namespace"
%token DECLARE		//"declare"
%token XMLSPACE		//"xmlspace"
%token PRESERVE		//"preserve"
%token STRIP		//"strip"
%token DEFAULT		//"default"
%token DOCUMENT_NODE	//"document-node"
%token DOCUMENT		//"document"
%token ELEMENT		//"element"
%token ATTRIBUTE	//"attribute"
%token PROCESSING_INSTRUCTION //"processing-instruction"
%token COMMENT		//"comment"
%token TEXT		//"text"
%token NODE		//"node"
%token FUNCTION		//"function"
%token COLLATION	//"collation"
%token CONSTRUCTION	//"construction"
%token ORDERING		//"ordering"
%token ORDERED		//"ordered"
%token UNORDERED	//"unordered"
%token BASEURI		//"base-uri"
%token IMPORT		//"import"
%token SCHEMA		//"schema"
%token AT		//"at"
%token VARIABLE		//"variable"
%token AS		//"as"
%token EXTERNAL		//"external"
%token VALIDATION	//"validation"
%token LAX		//"lax"
%token STRICT		//"strict"
%token SKIP		//"skip"
%token RETURN		//"return"
%token FOR		//"for"
%token LET		//"let"
%token IN		//"in"
%token WHERE		//"where"
%token ORDER		//"order"
%token BY		//"by"
%token STABLE		//"stable"
%token ASCENDING	//"ascending"
%token DESCENDING	//"descending"
%token EMPTY		//"empty"
%token GREATEST		//"greatest"
%token LEAST		//"least"
%token SOME		//"some"
%token EVERY		//"every"
%token SATISFIES	//"satisfies"
%token IS		//"is"
%token TO		//"to"
%token EQ		//"eq"
%token NE		//"ne"
%token LT		//"lt"
%token LE		//"le"
%token GT		//"gt"
%token GE		//"ge"
%token AND		//"and"
%token OR		//"or"
%token INSTANCE		//"instance"
%token OF		//"of"
%token IF		//"if"
%token THEN		//"then"
%token ELSE		//"else"
%token TYPESWITCH	//"typeswitch"
%token CASE		//"case"
%token TREAT		//"treat"
%token CASTABLE		//"castable"
%token CAST		//"as"
%token DIV		//"div"
%token IDIV		//"idiv"
%token MOD		//"mod"
%token UNION		//"union"
%token INTERSECT	//"intersect"
%token EXCEPT		//"except"
%token VALIDATE		//"validate"
%token CONTEXT		//"context"
%token NILLABLE		//"nillable"
%token ITEM		//"item"


%token GLOBAL		//"global"
%token TYPE		//"type"

%token CHILD			//"child"
%token DESCENDANT		//"descendant"
%token ATTRIBUTE		//"attribute"
%token SELF			//"self"
%token DESCENDANT_OR_SELF	//"descendant-or-self"
%token FOLLOWING_SIBLING	//"following-sibling"
%token FOLLOWING		//"following"
%token PARENT			//"parent"
%token ANCESTOR			//"ancestor"
%token PRECEDING_SIBLING	//"preceding-sibling"
%token PRECEDING		//"preceding"
%token ANCESTOR_OR_SELF		//"ancestor-or-self"



%token QNAME
%token NCNAME
%token WILD_LOCALNAME
%token WILD_PREFIX

%token STRING_LITERAL
%token DECIMAL_LITERAL
%token DOUBLE_LITERAL

%token PRAGMA_CONTENTS // characters until "::)"


%token PREDEFINED_ENTITY_REF
%token CHAR_REF

// Used only inside Constructor
%token XML_COMMENT_START // "<!--"
%token XML_COMMENT_TO_END // XML comment content immediate before "-->"
%token XML_PI_START // "<?"
%token XML_PI_TO_END // PI content immediate before "?>"
%token XML_CDATA_START // <![CDATA[
%token XML_CDATA_TO_END // CDATA section content immediate before "]]>"
%token EMPTY_TAG_CLOSE // "/>"
%token END_TAG_START // "</". Its appearance depends on the context
%token ATT_VALUE_LITERAL
%token ELEM_CONTENT_LITERAL
%token EXT_CONTENT
%token APOS			"'"
//%token APOS2			"''"
%token QUOT			//""""
//%token QUOT2			//""""""

%start Module

%%

/* --------------------------------------------------------
	 Modules and Prologs
-------------------------------------------------------- */

Module // returns Module
	: VersionDecl MainModule
	{
		string version = (string) $1;
		XQueryMainModule module = (XQueryMainModule) $2;
		module.Version = version;
		$$ = module;
	}
	| VersionDecl LibraryModule
	{
		string version = (string) $1;
		XQueryLibraryModule module = (XQueryLibraryModule) $2;
		$$ = module;
	}
	;

VersionDecl // returns string
	: // empty
	{
		$$ = null;
	}
	| XQUERY VERSION STRING_LITERAL {
		tokenizer.State = ParseState.Operator;
	  } SEMICOLON {
		tokenizer.State = ParseState.Default;
	  }
	{
		$$ = (string) $3;
	}
	;

MainModule // returns MainModule 
	: Prolog QueryBody
	{
		Prolog prolog = (Prolog) $1;
		ExprSequence body = (ExprSequence) $2;

		XQueryMainModule mod = new XQueryMainModule ();
		mod.Prolog = prolog;
		mod.QueryBody = body;
		$$ = mod;
	}
	;

LibraryModule // returns LibraryModule 
	: ModuleDecl Prolog
	{
		XQueryLibraryModule mod = new XQueryLibraryModule ();
		mod.ModuleDecl = (ModuleDecl) $1;
		mod.Prolog = (Prolog) $2;
		$$ = mod;
	}
	;

ModuleDecl // returns ModuleDecl 
	: MODULE NAMESPACE {
		tokenizer.State = ParseState.NamespaceDecl;
	  } NCName EQUAL STRING_LITERAL {
		tokenizer.State = ParseState.Default;
	  } SEMICOLON
	{
		ModuleDecl decl = new ModuleDecl ();
		decl.Prefix = (string) $4;
		decl.Namespace = (string) $6;
		tokenizer.AddNamespace (decl.Prefix, decl.Namespace);
		$$ = decl;
	}
	;

Prolog
	: // empty
	{
		$$ = new Prolog ();
	}
	| PrologContent SEMICOLON Prolog
	{
		Prolog p = (Prolog) $3;
		p.Add ($1);
		$$ = p;
	}
	;

PrologContent
	: Setter
	| DeclarationOrImport
	;

// FIXME: this production rule is the right one, but it brings 
// major shift/reduce conflicts.
/*
Prolog // returns Prolog 
	: Setters DeclarationsAndImports
	{
		Prolog p = (Prolog) $1;
		ArrayList al = (ArrayList) $2;
		if (al != null) {
			foreach (object o in al)
				p.Add (o);
		}
		$$ = p;
	}
	;

Setters // returns Prolog 
	: // empty
	{
		$$ = new Prolog ();
	}
	| Setter SEMICOLON Setters
	{
		Prolog p = (Prolog) $3;
		p.Add ($1);
		$$ = p;
	}
	;

DeclarationsAndImports // returns ArrayList 
	: // empty
	{
		$$ = null;
	}
	| DeclarationOrImport SEMICOLON DeclarationsAndImports
	{
		ArrayList al = (ArrayList) $3;
		if (al == null)
			al = new ArrayList ();
		al.Add ($1);
		$$ = al;
	}
	;

*/

Setter // returns object 
	: XmlSpaceDecl // XmlSpaceDecl
	| DefaultCollationDecl // SimplePrologContent
	| BaseURIDecl // SimplePrologContent
	| ConstructionDecl // ConstuctionDecl
	| DefaultNamespaceDecl // SimplePrologContent
	| DefaultOrderingDecl // bool
	;

DeclarationOrImport // returns object 
	: SchemaImport
	| ModuleImport
	| NamespaceDecl
	| VarDecl
	| FunctionDecl
	;

NamespaceDecl // returns XmlQualifiedName 
	: DECLARE NAMESPACE {
		tokenizer.State = ParseState.NamespaceDecl;
	  } NCName EQUAL STRING_LITERAL {
		tokenizer.State = ParseState.Default;
	  }
	{
		XmlQualifiedName name = new XmlQualifiedName ((string) $4, (string) $6);
		tokenizer.AddNamespace (name.Name, name.Namespace);
		$$ = name;
	}
	;

XmlSpaceDecl // returns XmlSpaceDecl 
	: DECLARE XMLSPACE { 
		tokenizer.State = ParseState.XmlSpaceDecl;
	  } PRESERVE {
		tokenizer.State = ParseState.Default;
	  }
	{
		$$ = new XmlSpaceDecl (XmlSpace.Preserve);
	}
	| DECLARE XMLSPACE { 
		tokenizer.State = ParseState.XmlSpaceDecl;
	  } STRIP {
		tokenizer.State = ParseState.Default;
	  }
	{
		$$ = new XmlSpaceDecl (XmlSpace.Default);
	}
	;

ConstructionDecl // returns ConstructionDecl 
	: DECLARE CONSTRUCTION { 
		tokenizer.State = ParseState.Operator;
	  } PRESERVE {
		tokenizer.State = ParseState.Default;
	  }
	{
		$$ = new ConstructionDecl (XmlSpace.Preserve);
	}
	| DECLARE CONSTRUCTION { 
		tokenizer.State = ParseState.Operator;
	  } STRIP {
		tokenizer.State = ParseState.Default;
	  }
	{
		$$ = new ConstructionDecl (XmlSpace.Default);
	}
	;

DefaultNamespaceDecl // returns SimplePrologContent 
	: DECLARE DEFAULT ELEMENT {
		tokenizer.State = ParseState.NamespaceKeyword;
	  } NAMESPACE {
		tokenizer.State = ParseState.NamespaceDecl;
	  } STRING_LITERAL {
		tokenizer.State = ParseState.Default;
	  }
	{
		tokenizer.AddNamespace (String.Empty, (string) $7);
		$$ = new SimplePrologContent (PrologContentType.DefaultElementNamespace, (string) $7);
	}
	| DECLARE DEFAULT FUNCTION {
		tokenizer.State = ParseState.NamespaceKeyword;
	  } NAMESPACE {
		tokenizer.State = ParseState.NamespaceDecl;
	  } STRING_LITERAL {
		tokenizer.State = ParseState.Default;
	  }
	{
		tokenizer.DefaultFunctionNamespace = (string) $5;
		$$ = new SimplePrologContent (PrologContentType.DefaultFunctionNamespace, (string) $5);
	}
	;

DefaultCollationDecl // returns SimplePrologContent 
	: DECLARE DEFAULT COLLATION {
		tokenizer.State = ParseState.NamespaceDecl;
	  } STRING_LITERAL {
		tokenizer.State = ParseState.Default;
	  }
	{
		$$ = new SimplePrologContent (PrologContentType.DefaultCollation, (string) $4);
	}
	;

DefaultOrderingDecl // returns bool 
	: DECLARE DEFAULT ORDERING {
		tokenizer.State = ParseState.Operator;
	  } ORDERED {
		tokenizer.State = ParseState.Default;
	  }
	{
		$$ = true;
	}
	| DECLARE DEFAULT ORDERING {
		tokenizer.State = ParseState.Operator;
	  } UNORDERED {
		tokenizer.State = ParseState.Default;
	  }
	{
		$$ = false;
	}
	;

BaseURIDecl // returns SimplePrologContent 
	: DECLARE BASEURI {
		tokenizer.State = ParseState.NamespaceDecl;
	  } STRING_LITERAL {
		tokenizer.State = ParseState.Default;
	  }
	{
		$$ = new SimplePrologContent (PrologContentType.BaseUri, (string) $3);
	}
	;

SchemaImport // returns SchemaImport 
	: IMPORT SCHEMA {
		tokenizer.State = ParseState.NamespaceKeyword;
	  } OptionalSchemaPrefix STRING_LITERAL {
		tokenizer.State = ParseState.Default;
	  } OptionalLocations
	{
		if ($4 != null)
			tokenizer.AddNamespace ((string) $4, (string) $5);
		$$ = new SchemaImport ((string) $4, (string) $5, (ICollection) $7);
	}
	;

OptionalSchemaPrefix // returns string or null 
	: // empty
	{
		$$ = null;
	}
	| SchemaPrefix
	;

SchemaPrefix // returns string 
	: NAMESPACE {
		tokenizer.State = ParseState.NamespaceDecl;
	  } NCName EQUAL {
	  }
	{
		$$ = (string) $3;
	}
	| DEFAULT ELEMENT NAMESPACE {
		tokenizer.State = ParseState.NamespaceDecl;
	  }
	{
		$$ = "";
	}
	;

ModuleImport // returns ModuleImport 
	: IMPORT MODULE {
		tokenizer.State = ParseState.NamespaceKeyword;
	  } OptionalModuleNamespace STRING_LITERAL {
		tokenizer.State = ParseState.Default;
	  } OptionalLocations
	{
		$$ = new ModuleImport ((string) $4, (string) $5, (ICollection) $7);
		tokenizer.AddNamespace ((string) $4, (string) $5);
	}
	;

OptionalModuleNamespace // returns string 
	: // empty
	{
		$$ = String.Empty;
	}
	| NAMESPACE {
		tokenizer.State = ParseState.NamespaceDecl;
	  } NCName EQUAL
	{
		$$ = (string) $3;
	}
	;

OptionalLocations // returns ArrayList or null 
	: // empty
	{
		$$ = null;
	}
	| AT STRING_LITERAL AdditionalLocations
	{
		ArrayList al = (ArrayList) $3;
		if (al != null)
			al = new ArrayList ();
		al.Add ((string) $2);
		$$ = al;
	}
	;

AdditionalLocations // returns ArrayList or null 
	: // empty
	{
		$$ = null;
	}
	| COMMA STRING_LITERAL AdditionalLocations
	{
		ArrayList al = (ArrayList) $3;
		if (al == null)
			al = new ArrayList ();
		al.Add ((string) $2);
		$$ = al;
	}
	;

VarDecl // returns VariableDeclaration 
	: DECLARE VARIABLE DOLLAR {
		tokenizer.PushState (ParseState.Default);
		tokenizer.State = ParseState.VarName;
	  } VarName {
		tokenizer.State = ParseState.Operator;
	  } OptionalTypeDeclaration VarDeclBody
	{
		$$ = new XQueryVariable ((XmlQualifiedName) $4, (SequenceType) $5, (ExprSequence) $6);
	}
	;

VarDeclBody // returns ExprSequence or null 
	: OPEN_CURLY {
		tokenizer.State = ParseState.Default;
	  } Expr CloseCurly
	{
		$$ = $2;
	}
	| EXTERNAL {
		// LAMESPEC: This state transition is not described in XQuery 1.0 spec
		tokenizer.PopState ();
	  }
	{
		$$ = null;
	}
	;

VarName // returns XmlQualifiedName 
	: QName {
		tokenizer.State = ParseState.Operator;
	  }
	{
		$$ = $1;
	}
	;

OptionalTypeDeclaration // returns SequenceType or null 
	: // empty
	{
		$$ = null;
	}
	| TypeDeclaration
	;

TypeDeclaration // returns SequenceType 
	: AS { // Note that this transition applies only at Operator state.
		tokenizer.State = ParseState.ItemType;
	  } SequenceType
	{
		$$ = $2;
	}
	;

FunctionDecl // returns FunctionDeclaration 
	: DECLARE FUNCTION {
		tokenizer.PushState (ParseState.Default);
		tokenizer.State = ParseState.Default;
	  } QName OPEN_PAREN OptionalParamList CLOSE_PAREN {
		tokenizer.State = ParseState.Operator;
	  }  OptionalTypeDeclaration FunctionBody
	{
		$$ = new FunctionDeclaration (
			(XmlQualifiedName) $4,
			(XQueryFunctionArgumentList) $6,
			(SequenceType) $9,
			(EnclosedExpr) $10);
	}
	;

FunctionBody // returns EnclosedExpr or null 
	: EnclosedExpr
	| EXTERNAL
	{
		$$ = null;
	}
	;

SequenceType // returns SequenceType 
	: ItemType OptionalOccurenceIndicator
	{
		$$ = new SequenceType ((ItemType) $1, (Occurence) $2);
	}
	| EMPTY OPEN_PAREN CLOSE_PAREN {
		tokenizer.State = ParseState.Operator;
	  }
	{
		$$ = SequenceType.Create (XmlTypeCode.None, Occurence.One);
	}
	;

OptionalOccurenceIndicator // returns Occurence 
	: // empty
	{
		$$ = Occurence.One;
	}
	| OccurenceIndicator
	;

OccurenceIndicator // returns Occurence 
	: QUESTION
	{
		$$ = Occurence.Optional;
	}
	| ASTERISK
	{
		$$ = Occurence.ZeroOrMore;
	}
	| PLUS
	{
		$$ = Occurence.OneOrMore;
	}
	;

OptionalParamList // returns XQueryFunctionArgumentList
	: // empty
	{
		$$ = new XQueryFunctionArgumentList ();
	}
	| ParamList
	;

ParamList // returns XQueryFunctionArgumentList 
	: Param
	{
		XQueryFunctionArgumentList pl = new XQueryFunctionArgumentList ();
		pl.Add ((XQueryFunctionArgument) $1);
		$$ = pl;
	}
	| Param COMMA ParamList
	{
		XQueryFunctionArgumentList pl = (XQueryFunctionArgumentList) $3;
		pl.Insert (0, (XQueryFunctionArgument) $1);
		$$ = pl;
	}
	;

Param // returns XQueryFunctionArgument 
	: DOLLAR {
		tokenizer.State = ParseState.VarName;
	  } VarName {
		tokenizer.State = ParseState.Operator;
	  } OptionalTypeDeclaration
	{
		$$ = new XQueryFunctionArgument ((XmlQualifiedName) $3, (SequenceType) $5);
	}
	;

QueryBody
	: Expr
	;


/* --------------------------------------------------------
	Expressions
-------------------------------------------------------- */

Expr // returns ExprSequence 
	: ExprSequence
	{
		ExprSequence seq = (ExprSequence) $1;
		$$ = seq;
	}
	;

ExprSequence // returns ExprSequence 
	: ExprSingle
	{
		ExprSequence seq = new ExprSequence ();
		seq.Add ((ExprSingle) $1);
		$$ = seq;
	}
	| ExprSingle COMMA ExprSequence
	{
		ExprSequence seq = (ExprSequence) $3;
		seq.Insert (0, (ExprSingle) $1);
		$$ = seq;
	}
	;

ExprSingle // returns ExprSingle 
	: FLWORExpr
	| QuantifiedExpr
	| TypeswitchExpr
	| IfExpr
	| OrExpr
	;

/* -------------------------------------
	FLWORExpr
------------------------------------- */

FLWORExpr // returns FLWORExpr 
	: RepeatedForLetClause OptionalWhereClause OptionalOrderByClause RETURN {
		tokenizer.State = ParseState.Default;
	  } ExprSingle
	{
		ForLetClauseCollection col = (ForLetClauseCollection) $1;
		$$ = new FLWORExpr (col, (ExprSequence) $2, (OrderSpecList) $3, (ExprSingle) $6);
	}
	;

RepeatedForLetClause // returns ForLetClauseCollection 
	: ForLetClause
	{
		ForLetClauseCollection col = new ForLetClauseCollection ();
		col.Add ((ForLetClause) $1);
		$$ = col;
	}
	| ForLetClause RepeatedForLetClause
	{
		ForLetClauseCollection col = (ForLetClauseCollection) $2;
		col.Insert (0, (ForLetClause) $1);
		$$ = col;
	}
	;

ForLetClause // returns ForLetClause 
	: ForClause
	| LetClause
	;

OptionalWhereClause // returns ExprSequence or null 
	: // empty
	{
		$$ = null;
	}
	| WhereClause
	;

OptionalOrderByClause
	: // empty
	{
		$$ = null;
	}
	| OrderByClause
	;

ForClause // returns ForClause 
	: FOR ForBody
	{
		ForClause fc = (ForClause) $2;
		$$ = fc;
	}
	;

ForBody
	: ForSingleBody
	{
		ForClause fc = new ForClause ();
		fc.Add ((ForSingleBody) $1);
		$$ = fc;
	}
	| ForSingleBody COMMA ForBody
	{
		ForClause fc = (ForClause) $3;
		fc.Insert (0, (ForSingleBody) $1);
		$$ = fc;
	}
	;

ForSingleBody // returns ForSingleBody 
	: DOLLAR {
		tokenizer.State = ParseState.VarName;
	  } VarName {
		tokenizer.State = ParseState.Operator;
	  } OptionalTypeDeclaration OptionalPositionalVar IN {
		tokenizer.State = ParseState.Default;
	  } ExprSingle
	{
		$$ = new ForSingleBody ((XmlQualifiedName) $3, (SequenceType) $5, (XmlQualifiedName) $6, (ExprSingle) $9);
	}
	;

LetClause
	: LET LetBody
	{
		LetClause let = (LetClause) $2;
		$$ = let;
	}
	;

LetBody
	: LetSingleBody
	{
		LetClause lc = new LetClause ();
		lc.Add ((LetSingleBody) $1);
		$$ = lc;
	}
	| LetSingleBody COMMA LetBody
	{
		LetClause let = (LetClause) $3;
		let.Insert (0, (LetSingleBody) $1);
		$$ = let;
	}

LetSingleBody
	: DOLLAR {
		tokenizer.State = ParseState.VarName;
	  } VarName {
		tokenizer.State = ParseState.Operator;
	  } OptionalTypeDeclaration COLON_EQUAL {
		tokenizer.State = ParseState.Default;
	  } ExprSingle
	{
		$$ = new LetSingleBody ((XmlQualifiedName) $3, (SequenceType) $5, (ExprSingle) $8);
	}
	;

OptionalPositionalVar // returns XmlQualifiedName 
	: // empty
	{
		$$ = XmlQualifiedName.Empty;
	}
	| PositionalVar
	;

PositionalVar
	: AT {
		tokenizer.State = ParseState.Default;
	  } DOLLAR {
		tokenizer.State = ParseState.VarName;
	  } VarName {
		tokenizer.State = ParseState.Operator;
	  }
	{
		$$ = $5;
	}
	;

WhereClause // returns ExprSequence 
	: WHERE {
		tokenizer.State = ParseState.Default;
	  } Expr
	{
		$$ = $3;
	}
	;

OrderByClause // returns OrderSpecList 
	: ORDER BY {
		tokenizer.State = ParseState.Default;
	  } OrderSpecList
	{
		OrderSpecList l = (OrderSpecList) $4;
		$$ = l;
	}
	| STABLE ORDER BY {
		tokenizer.State = ParseState.Default;
	  } OrderSpecList
	{
		OrderSpecList l = (OrderSpecList) $5;
		l.IsStable = true;
		$$ = l;
	}
	;

OrderSpecList // returns OrderSpecList 
	: OrderSpec
	{
		OrderSpecList osl = new OrderSpecList ();
		osl.Add ((OrderSpec) $1);
		$$ = osl;
	}
	| OrderSpec COMMA OrderSpecList
	{
		OrderSpecList l = (OrderSpecList) $3;
		l.Insert (0, (OrderSpec) $1);
		$$ = l;
	}
	;

OrderSpec // returns OrderSpec 
	: ExprSingle OrderModifier
	{
		$$ = new OrderSpec ((ExprSingle) $1, (OrderModifier) $2);
	}
	;

OrderModifier
	: OrderSpecBase OrderEmptyHandling OptionalCollation
	{
		$$ = new OrderModifier ((XmlSortOrder) $1, (XmlSortOrder) $2, (string) $3);
	}
	;

OrderSpecBase // returns XmlSortOrder 
	: // empty
	{
		$$ = XmlSortOrder.Ascending;
	}
	| ASCENDING
	{
		$$ = XmlSortOrder.Ascending;
	}
	| DESCENDING
	{
		$$ = XmlSortOrder.Descending;
	}
	;

/* FIXME: check if it is correct (especially empty case) */
OrderEmptyHandling // returns XmlSortOrder 
	: // empty
	{
		$$ = XmlSortOrder.Ascending;
	}
	| EMPTY GREATEST
	{
		$$ = XmlSortOrder.Ascending;
	}
	| EMPTY LEAST
	{
		$$ = XmlSortOrder.Descending;
	}
	;

OptionalCollation // returns string 
	: // empty
	{
		$$ = null;
	}
	| COLLATION STRING_LITERAL
	{
		$$ = $2;
	}
	;

/* -------------------------------------
	QuantifiedExpr
------------------------------------- */

QuantifiedExpr
	: SOME QuantifiedExprBody SATISFIES ExprSingle
	{
		QuantifiedExprBodyList l = (QuantifiedExprBodyList) $2;
		$$ = new QuantifiedExpr (false, l, (ExprSingle) $4);
	}
	| EVERY QuantifiedExprBody SATISFIES ExprSingle
	{
		QuantifiedExprBodyList l = (QuantifiedExprBodyList) $2;
		$$ = new QuantifiedExpr (true, l, (ExprSingle) $4);
	}
	;

QuantifiedExprBody
	: SingleQuantifiedExprBody
	{
		QuantifiedExprBodyList l = new QuantifiedExprBodyList ();
		l.Add ((QuantifiedExprBody) $1);
		$$ = l;
	}
	| SingleQuantifiedExprBody COMMA QuantifiedExprBody
	{
		QuantifiedExprBodyList l = (QuantifiedExprBodyList) $3;
		l.Insert (0, (QuantifiedExprBody) $1);
		$$ = l;
	}
	;

SingleQuantifiedExprBody // returns QuantifiedExprBody 
	: DOLLAR {
		tokenizer.State = ParseState.VarName;
	  } VarName {
		tokenizer.State = ParseState.Operator;
	  } OptionalTypeDeclaration IN {
		tokenizer.State = ParseState.Default;
	  } ExprSingle
	{
		$$ = new QuantifiedExprBody ((XmlQualifiedName) $3, (SequenceType) $5, (ExprSingle) $8);
	}
	;

/* -------------------------------------
	TypeswitchExpr
------------------------------------- */

TypeswitchExpr // returns TypeswitchExpr 
	: TYPESWITCH OPEN_PAREN {
		tokenizer.PushState (ParseState.Operator);
		tokenizer.State = ParseState.Default;
	  } Expr CLOSE_PAREN {
		tokenizer.State = ParseState.Operator;
	  } RepeatedCaseClause DEFAULT OptionalVarSpec RETURN {
		tokenizer.State = ParseState.Default;
	  } ExprSingle
	{
		$$ = new TypeswitchExpr ((ExprSequence) $4, (CaseClauseList) $7, (XmlQualifiedName) $9, (ExprSingle) $12);
	}
	;

RepeatedCaseClause // returns CaseClauseList 
	: CaseClause
	{
		CaseClauseList ccl = new CaseClauseList ();
		ccl.Add ((CaseClause) $1);
		$$ = ccl;
	}
	| CaseClause RepeatedCaseClause
	{
		CaseClauseList l = (CaseClauseList) $2;
		l.Add ((CaseClause) $1);
		$$ = l;
	}
	;

CaseClause // returns CaseClause 
	: CASE {
		tokenizer.State = ParseState.ItemType;
	  } SequenceType RETURN {
		tokenizer.State = ParseState.Default;
	  } ExprSingle
	{
		$$ = new CaseClause ((SequenceType) $3, (ExprSingle) $6, XmlQualifiedName.Empty);
	}
	| CASE {
		tokenizer.State = ParseState.ItemType;
	  } DOLLAR {
		tokenizer.State = ParseState.VarName;
	  } VarName {
		tokenizer.State = ParseState.Operator;
	  } AS {
		tokenizer.State = ParseState.ItemType;
	  } SequenceType RETURN {
		tokenizer.State = ParseState.Default;
	  } ExprSingle
	{
		$$ = new CaseClause ((SequenceType) $9, (ExprSingle) $12, (XmlQualifiedName) $5);
	}
	;

OptionalVarSpec // returns XmlQualifiedName 
	: // empty
	{
		$$ = XmlQualifiedName.Empty;
	}
	| DOLLAR VarName
	{
		$$ = (XmlQualifiedName) $2;
	}
	;

/* -------------------------------------
	IfExpr
------------------------------------- */

IfExpr
	: IF OPEN_PAREN Expr CLOSE_PAREN {
		tokenizer.State = ParseState.Operator;
	  } THEN {
		tokenizer.State = ParseState.Default;
	  } ExprSingle ELSE {
		tokenizer.State = ParseState.Default;
	  } ExprSingle
	{
		$$ = new IfExpr ((ExprSequence) $3, (ExprSingle) $8, (ExprSingle) $11);
	}
	;

/* -------------------------------------
	Logical Expressions
------------------------------------- */

OrExpr
	: AndExpr
	| AndExpr OR {
		tokenizer.State = ParseState.Default;
	  } OrExpr
	{
		$$ = new OrExpr ((ExprSingle) $1, (ExprSingle) $4);
	}
	;

AndExpr
	: InstanceOfExpr
	| InstanceOfExpr AND {
		tokenizer.State = ParseState.Default;
	  } AndExpr
	{
		$$ = new AndExpr ((ExprSingle) $1, (ExprSingle) $4);
	}
	;

/* -------------------------------------
	Typed Expressions
------------------------------------- */

InstanceOfExpr
	: TreatExpr
	| TreatExpr INSTANCE OF {
		tokenizer.State = ParseState.ItemType;
	  } SequenceType
	{
		$$ = new InstanceOfExpr ((ExprSingle) $1, (SequenceType) $5);
	}
	;

TreatExpr
	: CastableExpr
	| CastableExpr TREAT AS {
		tokenizer.State = ParseState.ItemType;
	  } SequenceType
	{
		$$ = new TreatExpr ((ExprSingle) $1, (SequenceType) $5);
	}
	;

CastableExpr
	: CastExpr
	| CastExpr CASTABLE AS {
		tokenizer.State = ParseState.ItemType;
	  } AtomicType OptionalQuestion
	{
		$$ = new CastableExpr ((ExprSingle) $1, (XmlTypeCode) $5, (bool)$6);
	}
	;

OptionalQuestion
	: // empty
	{
		$$ = false;
	}
	| QUESTION
	{
		$$ = true;
	}
	;

CastExpr
	: ComparisonExpr
	| ComparisonExpr CAST AS {
		tokenizer.State = ParseState.ItemType;
	  } AtomicType OptionalQuestion
	{
		$$ = new CastExpr ((ExprSingle) $1, (XmlTypeCode) $5, (bool) $6);
	}
	;

/* -------------------------------------
	Comparison Expressions
------------------------------------- */

ComparisonExpr
	: RangeExpr
	| RangeExpr Comp {
		tokenizer.State = ParseState.Default;
	  } RangeExpr
	{
		$$ = new ComparisonExpr ((ExprSingle) $1, (ExprSingle) $4, (ComparisonOperator) $2);
	}
	;

Comp // returns ComparisonOperator 
	: ValueComp
	| GeneralComp
	| NodeComp
	;

ValueComp
	: EQ
	{
		$$ = ComparisonOperator.ValueEQ;
	}
	| NE
	{
		$$ = ComparisonOperator.ValueNE;
	}
	| LT
	{
		$$ = ComparisonOperator.ValueLT;
	}
	| LE
	{
		$$ = ComparisonOperator.ValueLE;
	}
	| GT
	{
		$$ = ComparisonOperator.ValueGT;
	}
	| GE
	{
		$$ = ComparisonOperator.ValueGE;
	}
	;

GeneralComp
	: EQUAL
	{
		$$ = ComparisonOperator.GeneralEQ;
	}
	| NOT_EQUAL
	{
		$$ = ComparisonOperator.GeneralNE;
	}
	| LESSER
	{
		$$ = ComparisonOperator.GeneralLT;
	}
	| LESSER_EQUAL
	{
		$$ = ComparisonOperator.GeneralLE;
	}
	| GREATER
	{
		$$ = ComparisonOperator.GeneralGT;
	}
	| GREATER_EQUAL
	{
		$$ = ComparisonOperator.GeneralGE;
	}
	;

NodeComp
	: IS
	{
		$$ = ComparisonOperator.NodeIs;
	}
	| LESSER2
	{
		$$ = ComparisonOperator.NodeFWD;
	}
	| GREATER2
	{
		$$ = ComparisonOperator.NodeBWD;
	}
	;

RangeExpr
	: AdditiveExpr
	| AdditiveExpr TO {
		tokenizer.State = ParseState.Default;
	  } AdditiveExpr
	{
		$$ = new RangeExpr ((ExprSingle) $1, (ExprSingle)$4);
	}
	;

/* -------------------------------------
	Arithmetic Expressions
------------------------------------- */

AdditiveExpr
	: MultiplicativeExpr
	| MultiplicativeExpr PLUS {
		tokenizer.State = ParseState.Default;
	  } AdditiveExpr
	{
		$$ = new ArithmeticOperationExpr ((ExprSingle) $1, (ExprSingle) $4, ArithmeticOperator.Add);
	}
	| MultiplicativeExpr MINUS {
		tokenizer.State = ParseState.Default;
	  } AdditiveExpr
	{
		$$ = new ArithmeticOperationExpr ((ExprSingle) $1, (ExprSingle) $4, ArithmeticOperator.Sub);
	}
	;

MultiplicativeExpr 
	: UnaryExpr
	| UnaryExpr ASTERISK {
		tokenizer.State = ParseState.Default;
	  } MultiplicativeExpr
	{
		$$ = new ArithmeticOperationExpr ((ExprSingle) $1, (ExprSingle) $4, ArithmeticOperator.Mul);
	}
	| UnaryExpr DIV {
		tokenizer.State = ParseState.Default;
	  } MultiplicativeExpr
	{
		$$ = new ArithmeticOperationExpr ((ExprSingle) $1, (ExprSingle) $4, ArithmeticOperator.Div);
	}
	| UnaryExpr IDIV {
		tokenizer.State = ParseState.Default;
	  } MultiplicativeExpr
	{
		$$ = new ArithmeticOperationExpr ((ExprSingle) $1, (ExprSingle) $4, ArithmeticOperator.IDiv);
	}
	| UnaryExpr MOD {
		tokenizer.State = ParseState.Default;
	  } MultiplicativeExpr
	{
		$$ = new ArithmeticOperationExpr ((ExprSingle) $1, (ExprSingle) $4, ArithmeticOperator.IMod);
	}
	;

UnaryExpr
	: UnionExpr
	| MINUS UnionExpr
	{
		$$ = new MinusExpr ((ExprSingle) $2);
	}
	| PLUS UnionExpr
	{
		$$ = $2;
	}
	;

UnionExpr
	: IntersectExceptExpr
	| IntersectExceptExpr UNION {
		tokenizer.State = ParseState.Default;
	  } UnionExpr
	{
		$$ = new GroupExpr ((ExprSingle) $1, (ExprSingle) $4, AggregationType.Union);
	}
	| IntersectExceptExpr BAR {
		tokenizer.State = ParseState.Default;
	  } UnionExpr
	{
		$$ = new GroupExpr ((ExprSingle) $1, (ExprSingle) $4, AggregationType.Union);
	}
	;

IntersectExceptExpr
	: ValueExpr
	| ValueExpr INTERSECT {
		tokenizer.State = ParseState.Default;
	  } IntersectExceptExpr
	{
		$$ = new GroupExpr ((ExprSingle) $1, (ExprSingle) $4, AggregationType.Intersect);
	}
	| ValueExpr EXCEPT {
		tokenizer.State = ParseState.Default;
	  } IntersectExceptExpr
	{
		$$ = new GroupExpr ((ExprSingle) $1, (ExprSingle) $4, AggregationType.Except);
	}
	;

ValueExpr
	: ValidateExpr
	| PathExpr
	;

/* -----------------
 Validation Expressions
----------------- */

// FIXME: Here state transition is not well-tracked.

ValidateExpr // returns ValidateExpr 
	: VALIDATE OptionalValidationMode OPEN_CURLY {
		tokenizer.State = ParseState.Default;
		tokenizer.PushState (ParseState.Operator);
	  } Expr CloseCurly
	{
		$$ = new ValidateExpr ((XmlSchemaContentProcessing) $2, (ExprSequence) $6);
	}
	;

OptionalValidationMode // returns XmlSchemaContentProcessing 
	: // empty
	{
		$$ = XmlSchemaContentProcessing.Strict; // FIXME: confirm
	}
	| LAX
	{
		$$ = XmlSchemaContentProcessing.Lax;
	}
	| STRICT
	{
		$$ = XmlSchemaContentProcessing.Strict;
	}
	;

/* -----------------
 Path Expressions
----------------- */

PathExpr // returns PathExpr 
	: Slash
	{
		$$ = new PathRootExpr ();
	}
	| Slash RelativePathExpr
	{
		$$ = new PathSlashExpr (new PathRootExpr (), (ExprSingle) $2);
	}
	| Slash2 RelativePathExpr
	{
		$$ = new PathSlash2Expr (new PathRootExpr (), (ExprSingle) $2);
	}
	| RelativePathExpr
	;

RelativePathExpr // returns PathExpr 
	: StepExpr
	| StepExpr Slash RelativePathExpr
	{
		$$ = new PathSlashExpr ((ExprSingle) $1, (ExprSingle) $3);
	}
	| StepExpr Slash2 RelativePathExpr
	{
		$$ = new PathSlash2Expr ((ExprSingle) $1, (ExprSingle) $3);
	}
	;

StepExpr // returns ExprSingle 
	: AxisStep
	| FilterStep
	;

AxisStep // returns PathExpr 
	: ForwardOrReverseStep
	| AxisStep Predicate
	{
		$$ = new FilterStepExpr ((ExprSingle) $1, (ExprSequence) $2);
	}
	;

ForwardOrReverseStep // returns ExprSingle 
	: ForwardStep
	| ReverseStep
	;

Predicate
	: OPEN_BRACKET Expr CLOSE_BRACKET {
		tokenizer.State = ParseState.Operator;
	  }
	{
		$$ = $2;
	}
	;

FilterStep // returns ExprSingle 
	: PrimaryExpr
	| FilterStep Predicate
	{
		$$ = new FilterStepExpr ((ExprSingle) $1, (ExprSequence) $2);
	}
	;

ForwardStep // returns AxisStepExpr
	: ForwardAxis NodeTest
	{
		$$ = new AxisStepExpr ((XPathAxis) $1, (XPath2NodeTest) $2);
	}
	| AbbrevForwardStep
	;

ReverseStep // returns AxisStepExpr
	: ReverseAxis NodeTest
	{
		$$ = new AxisStepExpr ((XPathAxis) $1, (XPath2NodeTest) $2);
	}
	| AbbrevReverseStep
	;

ForwardAxis // returns XPathAxis 
	: CHILD COLON2
	{
		$$ = XPathAxis.Child;
	}
	| DESCENDANT COLON2
	{
		$$ = XPathAxis.Descendant;
	}
	| ATTRIBUTE COLON2
	{
		$$ = XPathAxis.Attribute;
	}
	| SELF COLON2
	{
		$$ = XPathAxis.Self;
	}
	| DESCENDANT_OR_SELF COLON2
	{
		$$ = XPathAxis.DescendantOrSelf;
	}
	| FOLLOWING_SIBLING COLON2
	{
		$$ = XPathAxis.FollowingSibling;
	}
	| FOLLOWING COLON2
	{
		$$ = XPathAxis.Following;
	}
	;

ReverseAxis // returns XPathAxis 
	: PARENT COLON2
	{
		$$ = XPathAxis.Parent;
	}
	| ANCESTOR COLON2
	{
		$$ = XPathAxis.Ancestor;
	}
	| PRECEDING_SIBLING COLON2
	{
		$$ = XPathAxis.PrecedingSibling;
	}
	| PRECEDING COLON2
	{
		$$ = XPathAxis.Preceding;
	}
	| ANCESTOR_OR_SELF COLON2
	{
		$$ = XPathAxis.AncestorOrSelf;
	}
	;

// LAMESPEC: in the XQuery spec, it is "@? NodeTest", but NodeKindTest 
// should not appear after AT. (imagine @processing-instruction::(name)).
AbbrevForwardStep // returns NodeTestExpr 
	: NodeTest
	{
		$$ = new AxisStepExpr (XPathAxis.Child, (XPath2NodeTest) $1);
	}
	| AT NameTest
	{
		$$ = new AxisStepExpr (XPathAxis.Attribute, new XPath2NodeTest ((XmlQualifiedName) $2));
	}
	;

AbbrevReverseStep // returns AxisStepExpr
	: DOT2
	{
		$$ = new AxisStepExpr (XPathAxis.Parent, null);
	}
	;

NodeTest // returns NodeTest
	: KindTest
	{
		$$ = new XPath2NodeTest ((KindTest) $1);
	}
	| NameTest
	{
		$$ = new XPath2NodeTest ((XmlQualifiedName) $1);
	}
	;

NameTest // returns XmlQualifiedName 
	: QName
	| Wildcard {
		tokenizer.State = ParseState.Operator;
	  }
	;

Wildcard // returns XmlQualifiedName  /*ws:explicit*/
	: ASTERISK
	{
		$$ = new XmlQualifiedName ("*", "*");
	}
	| WILD_LOCALNAME
	{
		$$ = (XmlQualifiedName) $1;
	}
	| WILD_PREFIX
	{
		$$ = (XmlQualifiedName) $1;
	}
	;

AtomicType // returns XmlTypeCode 
	: QName
	{
		$$ = GetAtomicTypeCode ((XmlQualifiedName) $1);
	}
	;

ItemType // returns ItemType
	: AtomicType {
		tokenizer.State = ParseState.OccurenceIndicator;
	  }
	{
		$$ = new ItemType ((XmlTypeCode) $1);
	}
	| KindTest
	| ITEM OPEN_PAREN CLOSE_PAREN {
		tokenizer.State = ParseState.OccurenceIndicator;
	  }
	{
		$$ = new ItemType (XmlTypeCode.Item);
	}
	;

KindTest // returns KindTest
	: DocumentTest
	| ElementTest
	| AttributeTest
	| PITest
	| CommentTest
	| TextTest
	| AnyKindTest
	;

PITest
	: PROCESSING_INSTRUCTION OPEN_PAREN {
		// LAMESPEC: push state is described as Operator, but should 
		// be OccurenceIndicator (as any KindTest could be followed by
		// '?' '+' or '*')
		tokenizer.PushState (ParseState.OccurenceIndicator);
		tokenizer.State = ParseState.KindTestForPI;
	  } PITestContent CLOSE_PAREN {
		tokenizer.PopState ();
	  }
	{
		$$ = $4;
	}
	;

PITestContent // returns KindTest
	: // empty
	{
		$$ = new KindTest (XmlTypeCode.ProcessingInstruction);
	}
	| NCName
	{
		$$ = new XmlPITest ((string) $1);
	}
	| STRING_LITERAL
	{
		$$ = new XmlPITest ((string) $1);
	}
	;

CommentTest
	: COMMENT OPEN_PAREN {
		tokenizer.PushState (ParseState.OccurenceIndicator);
		tokenizer.State = ParseState.KindTest;
	  } CLOSE_PAREN {
	  	tokenizer.PopState ();
	  }
	{
		$$ = new KindTest (XmlTypeCode.Comment);
	}
	;

TextTest
	: TEXT OPEN_PAREN {
		tokenizer.PushState (ParseState.OccurenceIndicator);
		tokenizer.State = ParseState.KindTest;
	  } CLOSE_PAREN {
	  	tokenizer.PopState ();
	  }
	{
		$$ = new KindTest (XmlTypeCode.Text);
	}
	;

AnyKindTest
	: NODE OPEN_PAREN {
		tokenizer.PushState (ParseState.OccurenceIndicator);
		tokenizer.State = ParseState.KindTest;
	  } CLOSE_PAREN {
	  	tokenizer.PopState ();
	  }
	{
		$$ = new KindTest (XmlTypeCode.Node);
	}
	;

DocumentTest // returns DocumentTest
	: DOCUMENT_NODE OPEN_PAREN {
		tokenizer.PushState (ParseState.OccurenceIndicator);
		tokenizer.State = ParseState.KindTest;
	  } DocumentTestContent CLOSE_PAREN {
	  	tokenizer.PopState ();
	  }
	{
		$$ = $4;
	}
	;

DocumentTestContent // returns DocumentTest
	: // empty
	{
		$$ = new KindTest (XmlTypeCode.Document);
	}
	| ElementTest
	{
		$$ = new DocumentTest ((ElementTest) $1);
	}
	;

ElementTest // returns ElementTest
	: ELEMENT OPEN_PAREN {
		tokenizer.PushState (ParseState.OccurenceIndicator);
		tokenizer.State = ParseState.KindTest;
	  } ElementTestContent CLOSE_PAREN {
		tokenizer.PopState ();
	  }
	{
		$$ = $4;
	}
	;

ElementTestContent // returns ElementTest
	: // empty
	{
		$$ = new KindTest (XmlTypeCode.Element);
	}
	| ElementNameOrWildcard
	{
		$$ = new ElementTest ((XmlQualifiedName) $1);
	}
	| ElementNameOrWildcard COMMA TypeName OptionalQuestion
	{
		$$ = new ElementTest ((XmlQualifiedName) $1, (XmlQualifiedName) $3, (bool) $4);
	}
	;

OptionalQuestion // returns bool 
	: // empty
	{
		$$ = false;
	}
	| QUESTION
	{
		$$ = true;
	}
	;

AttributeTest // returns AttributeTest
	: ATTRIBUTE OPEN_PAREN {
		tokenizer.PushState (ParseState.OccurenceIndicator);
		tokenizer.State = ParseState.KindTest;
	  } AttributeTestContent CLOSE_PAREN {
		tokenizer.PopState ();
	  }
	{
		$$ = $4;
	}
	;

AttributeTestContent // returns AttributeTest
	: // empty
	{
		$$ = AttributeTest.AnyAttribute;
	}
	| AttributeNameOrWildcard
	{
		$$ = new AttributeTest ((XmlQualifiedName) $1);
	}
	| AttributeNameOrWildcard COMMA TypeNameOrWildcard
	{
		$$ = new AttributeTest ((XmlQualifiedName) $1, (XmlQualifiedName) $3);
	}
	;

ElementName
	: QName
	;

AttributeName
	: QName
	;

TypeName
	: QName
	;

ElementNameOrWildcard // returns XmlQualifiedName 
	: ElementName
	| ASTERISK
	{
		$$ = new XmlQualifiedName ("*", "*");
	}
	;

AttributeNameOrWildcard // returns XmlQualifiedName 
	: AttributeName
	| ASTERISK
	{
		$$ = new XmlQualifiedName ("*", "*");
	}
	;

TypeNameOrWildcard // returns XmlQualifiedName 
	: TypeName
	| ASTERISK
	{
		$$ = new XmlQualifiedName ("*", "*");
	}
	;

/* ----------------
 Primary Expressions
---------------- */

PrimaryExpr // returns ExprSingle 
	: Literal {
		tokenizer.State = ParseState.Operator;
	  }
	| VarRef
	| ParenthesizedExpr
	| ContextItemExpr
	| FunctionCall
	| Constructor
	| OrderedExpr
	| UnorderedExpr
	;

Literal
	: DECIMAL_LITERAL
	{
		$$ = new DecimalLiteralExpr ((decimal) $1);
	}
	| DOUBLE_LITERAL
	{
		$$ = new DoubleLiteralExpr ((double) $1);
	}
	| STRING_LITERAL
	{
		$$ = new StringLiteralExpr ((string) $1);
	}
	;

/*
NUMERIC_LITERAL
	: IntegerLiteral
	| DecimalLiteral
	| DoubleLiteral
	;

IntegerLiteral
	: Digits
	;

DecimalLiteral
	: DOT Digits
	| Digits DOT OptDigits
	;

DoubleLiteral
	: DoubleDecimalPartSpec ExponentSpec
	;

DoubleDecimalPartSpec
	: DOT Digits
	| Digits
	| Digits DOT OptDigits

ExponentSpec
	: // empty/*
	| ExponentAlpha Digits
	| ExponentAlpha PLUS Digits
	| ExponentAlpha MINUS Digits
	;

ExponentAlpha
	: LARGE_E
	| SMALL_E
	;

OptDigits
	: // empty/*
	| Digits
	;

Digits
	: ZERO_TO_NINE_SEQ
	;

STRING_LITERAL
	: QUOT STRING_LITERALContentQuot
	| APOS STRING_LITERALContentApos
	;

STRING_LITERALContentQuot
	: PREDEFINED_ENTITY_REF
	| CHAR_REF
	| QUOT2
	| REMAINING_LITERAL
	;

STRING_LITERALContentApos
	: PREDEFINED_ENTITY_REF
	| CHAR_REF
	| APOS2
	| REMAINING_LITERAL
	;
*/

VarRef // returns VariableReferenceExpr 
	: DOLLAR {
		tokenizer.State = ParseState.VarName;
	  } VarName
	{
		$$ = new VariableReferenceExpr ((XmlQualifiedName) $3);
	}
	;

VarName // returns XmlQualifiedName 
	: QName {
		tokenizer.State = ParseState.Operator;
	  }
	{
		$$ = $1;
	}
	;

ParenthesizedExpr // returns ParenthesizedExpr 
	: OPEN_PAREN OptionalExpr CLOSE_PAREN {
		tokenizer.State = ParseState.Operator;
	  }
	{
		$$ = new ParenthesizedExpr ((ExprSequence) $2);
	}
	;

OptionalExpr
	: // empty
	{
		$$ = new ExprSequence ();
	}
	| Expr
	;

ContextItemExpr // returns ContextItemExpr 
	: DOT {
		tokenizer.State = ParseState.Operator;
	  }
	{
		$$ = new ContextItemExpr ();
	}
	;

FunctionCall
	: QName OPEN_PAREN {
		tokenizer.State = ParseState.Default;
	  } OptionalExpr CLOSE_PAREN {
		tokenizer.State = ParseState.Operator;
	  }
	{
		XmlQualifiedName name = (XmlQualifiedName) $1;
		if (name.Namespace == "")
			name = new XmlQualifiedName (name.Name, tokenizer.DefaultFunctionNamespace);
		if (name.Namespace != ""
				&& name.Namespace != XmlSchema.XdtNamespace
				&& reservedFunctionNames [name.Name] != null)
			throw new XmlQueryCompileException (String.Format ("'{0}' is reserved and cannot be used as a function name.", name.Name));

		$$ = new FunctionCallExpr (name, (ExprSequence) $4);
	}
	;

OrderedExpr
	: ORDERED OPEN_BRACKET Expr CLOSE_BRACKET
	{
		$$ = new OrderSpecifiedExpr ((ExprSequence) $3, true);
	}
	;

UnorderedExpr
	: UNORDERED OPEN_BRACKET {
		tokenizer.PushState (ParseState.Operator);
		tokenizer.State = ParseState.Default;
	  } Expr CLOSE_BRACKET {
	  	tokenizer.PopState ();
	  }
	{
		$$ = new OrderSpecifiedExpr ((ExprSequence) $4, false);
	}
	;


/* -----------------
 Constructors
----------------- */


Constructor // returns ExprSingle 
	: DirElemConstructor
	| ComputedConstructor
	| XmlComment
	| XmlPI
	| XmlCData
	;

DirElemConstructor // returns XmlElemConstructor 
	: LESSER {
		if (tokenizer.State == ParseState.ElementContent)
			tokenizer.PushState (tokenizer.State);
//		if (tokenizer.State == ParseState.Default)
		else // considering <foo></foo><bar></bar> there after </foo> state is Operator.
			tokenizer.PushState (ParseState.Operator);
		tokenizer.State = ParseState.StartTag;
		// FIXME: tokenizer.Space = WhitespaceHandling.Significant;
	  } QName AttributeList FollowDirElemConstructor {
		tokenizer.PopState ();
	  }
	{
		ExprSequence expr = new ExprSequence ();
		expr.AddRange ((ICollection) $4);
		expr.AddRange ((ICollection) $5);
		$$ = new XmlElemConstructor ((XmlQualifiedName) $3, expr);
	}
	;

FollowDirElemConstructor // returns ExprSequence 
	: EMPTY_TAG_CLOSE
	{
		$$ = new ExprSequence ();
	}
	| GREATER {
		tokenizer.State = ParseState.ElementContent;
	  } ElementContentList END_TAG_START {
		tokenizer.State = ParseState.EndTag;
	  } QName {
//	  	tokenizer.Space = WhitespaceHandling.Arbitrary;
	  } GREATER
	{
		$$ = $3;
	}
	;

ElementContentList // returns ExprSequence 
	: // empty
	{
		$$ = new ExprSequence ();
	}
	| ElementContent ElementContentList
	{
		ExprSequence el = (ExprSequence) $2;
		el.Insert (0, (ExprSingle) $1);
		$$ = el;
	}
	;

AttributeList // returns XmlAttrConstructorList 
	: // empty
	{
		$$ = new XmlAttrConstructorList ();
	}
	| /* space */ Attribute AttributeList
	{
		XmlAttrConstructorList al = (XmlAttrConstructorList) $2;
		al.Insert (0, (XmlAttrConstructor) $1);
		$$ = al;
	}
	;

Attribute // returns XmlAttrConstructor
	: QName /* opt-space */ EQUAL /* opt-space */ AttributeValue
	{
		$$ = new XmlAttrConstructor ((XmlQualifiedName) $1, (ExprSequence) $3);
	}
	;

/*
// FIXME: it should be more complex
AttributeValue // returns ExprSequence
	: STRING_LITERAL
	{
		ExprSequence es = new ExprSequence ();
		es.Insert (0, new StringLiteralExpr ((string) $1));
		$$ = es;
	}
	;
*/

AttributeValue // returns ExprSequence
	: QUOT {
		tokenizer.State = ParseState.QuotAttributeContent;
	  } AttributeValueContentSequence QUOT {
		tokenizer.State = ParseState.StartTag;
	  }
	{
		$$ = $3;
	}
	| APOS {
		tokenizer.State = ParseState.AposAttributeContent;
	  } AttributeValueContentSequence APOS {
		tokenizer.State = ParseState.StartTag;
	  }
	{
		$$ = $3;
	}
	;


AttributeValueContentSequence // returns ExprSequence
	: // empty
	{
		$$ = new ExprSequence ();
	}
	| AttributeValueContent AttributeValueContentSequence
	{
		ExprSequence es = (ExprSequence) $2;
		es.Insert (0, (ExprSingle) $1);
		$$ = es;
	}
	;

AttributeValueContent // returns ExprSingle
	: ATT_VALUE_LITERAL // including "{{", "}}" and char/predefined entities
	{
		$$ = new StringLiteralExpr ((string) $1);
	}
	| EnclosedExpr
	;

EnclosedExpr // returns EnclosedExpr 
	// FIXME: check if this state transition is valid for ElementContent and AttributeValueContent
	: OPEN_CURLY {
		switch (tokenizer.State) {
		case ParseState.ElementContent:
		case ParseState.QuotAttributeContent:
		case ParseState.AposAttributeContent:
			tokenizer.PushState (tokenizer.State);
			break;
		}
		tokenizer.State = ParseState.Default;
	  } Expr CloseCurly
	{
		$$ = new EnclosedExpr ((ExprSequence) $3);
	}
	;

ElementContent // returns ExprSingle 
	: ELEM_CONTENT_LITERAL // including "{{", "}}" and char/predefined entities
	{
		$$ = new XmlTextConstructor ((string) $1);
	}
	| DirElemConstructor
	| EnclosedExpr
	| XmlCData
	| XmlComment
	| XmlPI
	;

XmlCData
	: XML_CDATA_START XML_CDATA_TO_END
	{
		$$ = new XmlTextConstructor ((string) $2);
	}
	;

XmlComment // returns XmlCommentConstructor 
	: XML_COMMENT_START XML_COMMENT_TO_END
	{
		$$ = new XmlCommentConstructor ((string) $2);
	}
	;

XmlPI // returns XmlPIConstructor 
	: XML_PI_START {
		tokenizer.PushState (tokenizer.State);
		tokenizer.State = ParseState.XmlPI;
	  } PITarget {
		tokenizer.State = ParseState.XmlPIContent;
	  } XML_PI_TO_END {
		tokenizer.PopState ();
	  }
	{
		string name = (string) $3;
		$$ = new XmlPIConstructor (name, (string) $5);
	}
	;

PITarget
	: NCName
	;

ComputedConstructor // returns ExprSingle 
	: CompElemConstructor
	| CompAttrConstructor
	| CompDocConstructor
	| CompTextConstructor
	| CompXmlPI
	| CompXmlComment
	| CompNSConstructor
	;

CompElemConstructor
	: ELEMENT QName OPEN_CURLY Expr CloseCurly
	{
		$$ = new XmlElemConstructor ((XmlQualifiedName) $2, (ExprSequence) $4);
	}
	| ELEMENT OPEN_CURLY Expr CloseCurly OPEN_CURLY Expr CloseCurly
	{
		$$ = new XmlElemConstructor ((ExprSequence) $3, (ExprSequence) $6);
	}
	;

CompAttrConstructor
	: ATTRIBUTE QName OPEN_CURLY Expr CloseCurly
	{
		$$ = new XmlAttrConstructor ((XmlQualifiedName) $2, (ExprSequence) $4);
	}
	| ATTRIBUTE OPEN_CURLY Expr CloseCurly OPEN_CURLY Expr CloseCurly
	{
		$$ = new XmlAttrConstructor ((ExprSequence) $3, (ExprSequence) $6);
	}
	;

CompNSConstructor
	: NAMESPACE NCName OPEN_CURLY Expr CloseCurly
	{
		$$ = new XmlNSConstructor ((string) $2, (ExprSequence) $4);
	}
	;

CompDocConstructor
	: DOCUMENT OPEN_CURLY Expr CloseCurly
	{
		$$ = new XmlDocConstructor ((ExprSequence) $3);
	}
	;

CompTextConstructor
	: TEXT OPEN_CURLY Expr CloseCurly
	{
		$$ = new XmlTextConstructor ((ExprSequence) $3);
	}
	;

CompXmlComment
	: COMMENT OPEN_CURLY Expr CloseCurly
	{
		$$ = new XmlCommentConstructor ((ExprSequence) $3);
	}
	;

CompXmlPI
	: PROCESSING_INSTRUCTION NCName OPEN_CURLY Expr CloseCurly
	{
		$$ = new XmlPIConstructor ((string) $2, (ExprSequence) $4);
	}
	| PROCESSING_INSTRUCTION OPEN_CURLY Expr CloseCurly OPEN_CURLY Expr CloseCurly
	{
		$$ = new XmlPIConstructor ((ExprSequence) $3, (ExprSequence) $6);
	}
	;

/* -----------------
 Terminal Wrappers
----------------- */


NCName // returns string 
	: NCNAME
	;

QName // returns XmlQualifiedName. Note that this state is just a wrapper for state transition. 
	: QNAME {
		switch (tokenizer.State) {
		case ParseState.Default:
			tokenizer.State = ParseState.Operator;
			break;
		case ParseState.ItemType:
			tokenizer.State = ParseState.OccurenceIndicator;
			break;
		case ParseState.KindTest:
		case ParseState.SchemaContextStep:
			tokenizer.State = ParseState.CloseKindTest;
			break;
		case ParseState.ExtKey:
			tokenizer.State = ParseState.ExprComment;
			break;
		}
	  }
	;

Slash
	: SLASH {
		switch (tokenizer.State) {
		case ParseState.Operator:
			tokenizer.State = ParseState.Default;
			break;
		case ParseState.KindTest:
			tokenizer.State = ParseState.SchemaContextStep;
			break;
		}
	  }
	;

Slash2
	: SLASH2 {
		if (tokenizer.State == ParseState.Operator)
			tokenizer.State = ParseState.Default;
	  }
	;

CloseCurly
	: CLOSE_CURLY {
		if (tokenizer.State == ParseState.Operator)
			tokenizer.PopState ();
	  }
	;

%%

}

#endif