Package net.sf.saxon.expr.parser
Class ExpressionParser
java.lang.Object
net.sf.saxon.expr.parser.ExpressionParser
- Direct Known Subclasses:
PatternParser
,QueryParser
Parser for XPath expressions and XSLT patterns.
This code was originally inspired by James Clark's xt but has been totally rewritten (several times)
The base class handles parsing of XPath 2.0 and XPath 3.0 syntax (switched by a languageVersion variable).
Subclasses refine this to handle XQuery syntax (1.0 and 3.0) and XQuery Update syntax.
- Author:
- Michael Kay
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Nested Class Summary
Nested ClassesModifier and TypeClassDescriptionprotected static class
A Container used on a temporary basis to hold an expression while it is being parsed -
Field Summary
FieldsModifier and TypeFieldDescriptionprotected boolean
protected CodeInjector
protected Container
protected StaticContext
protected int
protected DecimalValue
protected NameChecker
protected boolean
static final int
protected Tokenizer
static final int
static final int
static final int
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionprotected boolean
Test whether the current token is one that can start a RelativePathExpressionprotected String
Display the current token in an error messageprotected void
Callback to tailor the tokenizervoid
declareRangeVariable
(Binding declaration) Declare a range variable (record its existence within the parser).protected boolean
Test whether the current token is one that is disallowed after a "leading lone slash".void
expect
(int token) Expect a given token; fail if the current token is different.protected Binding
findRangeVariable
(StructuredQName qName) Locate a range variable with a given name.Set a CodeInjector which can be used to modify or wrap expressions on the tree as the expression is parsed and the tree is constructed.Get the default container for newly constructed expressionsprotected String
Get the current language (XPath or XQuery)Get the name checker used by this parserGet the stack of in-scope range variablesGet the static context used by this expression parserGet the tokenizer (the lexical analyzer)void
Report a syntax error (a static error with error code XP0003)void
Report a static errorvoid
Report a static error, with location informationprotected void
grumble
(String message, StructuredQName errorCode, int offset) Report a static errorvoid
grumble
(XPathException error) protected boolean
Test whether the current token is a given keyword.protected boolean
Ask whether the syntax namespace-node() is allowed in a node kind test.protected Expression
makeCurriedFunction
(int offset, StructuredQName name, Expression[] args, IntSet placeMarkers) Process a function call in which one or more of the argument positions are represented as "?" placemarkers (indicating partial application or currying)makeLocalNameTest
(short nodeType, String localName) Make a LocalNameTest (*:name)final int
makeNameCode
(String qname, boolean useDefault) Make a NameCode, using the static context for namespace resolutionfinal int
makeNameCodeSilently
(String qname, boolean useDefault) Make a NameCode, using the static context for namespace resolution.makeNamespaceTest
(short nodeType, String prefix) Make a NamespaceTest (name:*)makeNameTest
(short nodeType, String qname, boolean useDefault) Make a NameTest, using the static context for namespace resolutionfinal NodeName
makeNodeName
(String qname, boolean useDefault) Make a FingerprintedQName, using the static context for namespace resolutionprotected Literal
makeStringLiteral
(String currentTokenValue) Method to make a string literal from a token identified as a string literal.final StructuredQName
makeStructuredQName
(String qname, boolean useDefault) Make a Structured QName, using the static context for namespace resolutionmakeTracer
(int startOffset, Expression exp, int construct, StructuredQName qName) If tracing, wrap an expression in a trace instructionvoid
Read the next token, catching any exception thrown by the tokenizerprotected String
Normalize an EQName.parse
(String expression, int start, int terminator, int lineNumber, StaticContext env) Parse a string representing an expression.protected Expression
parseBasicStep
(boolean firstInPattern) Parse a basic step expression (without the predicates)parseBinaryExpression
(Expression lhs, int minPrecedence) Parse a binary expression, using operator precedence parsing.protected Expression
Parse a node constructor.protected Expression
parseDynamicFunctionCall
(Expression functionItem) Parse a dynamic function callParse a top-level Expression: ExprSingle ( ',' ExprSingle )*Parse an ExprSingleprotected Expression
Parse an Extension Expression This construct is XQuery-only, so the XPath version of this method throws an error unconditionallyprotected Expression
Parse a FOR or LET expression: for $x in expr (',' $y in expr)* 'return' expr let $x := expr (', $y := expr)* 'return' expr This version of the method handles the subset of the FLWOR syntax allowed in XPathParse an argument to a function call.protected Expression
Parse a function call.protected ItemType
Get the item type used for function items (XPath 3.0 higher order functions)protected Expression
Parse an inline function "function" "(" ParamList? ")" ("as" SequenceType)? EnclosedExpr On entry, "function (" has already been readParse an ItemType within a SequenceTypeprotected Expression
Parse a literal function item (introduced in XQuery 1.1) Syntax: QName # integer The QName and # have already been readprotected Expression
Parse a map expression.protected ItemType
Get the item type used for map items (XPath 3.0)protected NodeTest
parseNodeTest
(short nodeType) Parse a NodeTest.protected Expression
protected ItemType
Parse a parenthesized item type (XPath 3.0)protected Expression
Parse a PathExpresssion.protected Expression
Parse the expression within a predicate.protected Expression
Parse a relative path (a sequence of steps).protected Expression
parseRemainingPath
(Expression start) Parse the remaining steps of an absolute path expression (one starting in "/" or "//").Parse the sequence type production.parseSequenceType
(String input, StaticContext env) Parse a string representing a sequence typeprotected Expression
parseStepExpression
(boolean firstInPattern) Parse a step (including an optional sequence of predicates)protected Expression
protected Expression
Parse a Switch Expression.protected Expression
Parse a try/catch Expression This construct is XQuery-1.1 only, so the XPath version of this method throws an error unconditionallyprotected Expression
Parse a Type Pattern This construct is used only in XSLT patterns, so the XPath version of this method throws an error unconditionallyprotected Expression
Parse a Typeswitch Expression.protected Expression
Parse a Validate Expression.protected Expression
reportMissingFunction
(int offset, StructuredQName functionName, Expression[] arguments) protected StructuredQName
resolveFunctionName
(String fname) Interpret a function name, returning it as a resolved QNamevoid
setCodeInjector
(CodeInjector injector) Set a CodeInjector which can be used to modify or wrap expressions on the tree as the expression is parsed and the tree is constructed.void
setDefaultContainer
(Container container) Set the default container for newly constructed expressionsvoid
setLanguage
(int language, DecimalValue version) Set the current language (XPath or XQuery, XSLT Pattern, or SequenceType)protected void
setLocation
(Expression exp) Set location information on an expression.void
setLocation
(Expression exp, int offset) Set location information on an expression.void
setLocation
(Clause clause, int offset) Set location information on a clause of a FLWOR expression.void
setRangeVariables
(Stack<Binding> variables) Set a new stack of in-scope range variablesvoid
setRangeVariableStack
(Stack<Binding> stack) Set the range variable stack.void
setScanOnly
(boolean scanOnly) Set that we are parsing in "scan only"protected void
testPermittedAxis
(byte axis) void
Note when the most recently declared range variable has gone out of scopeprotected void
Output a warning message
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Field Details
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t
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env
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rangeVariables
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defaultContainer
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nameChecker
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allowXPath30Syntax
protected boolean allowXPath30Syntax -
scanOnly
protected boolean scanOnly -
codeInjector
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language
protected int language -
XPATH
public static final int XPATH- See Also:
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XSLT_PATTERN
public static final int XSLT_PATTERN- See Also:
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SEQUENCE_TYPE
public static final int SEQUENCE_TYPE- See Also:
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XQUERY
public static final int XQUERY- See Also:
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languageVersion
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Constructor Details
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ExpressionParser
public ExpressionParser()Create an expression parser
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Method Details
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setCodeInjector
Set a CodeInjector which can be used to modify or wrap expressions on the tree as the expression is parsed and the tree is constructed. This is typically used to add tracing code.- Parameters:
injector
- the code injector to be used
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getCodeInjector
Set a CodeInjector which can be used to modify or wrap expressions on the tree as the expression is parsed and the tree is constructed. This is typically used to add tracing code.- Returns:
- the code injector in use, if any; or null otherwise
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getTokenizer
Get the tokenizer (the lexical analyzer)- Returns:
- the tokenizer (the lexical analyzer)
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getStaticContext
Get the static context used by this expression parser- Returns:
- the static context
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setDefaultContainer
Set the default container for newly constructed expressions- Parameters:
container
- the default container
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getDefaultContainer
Get the default container for newly constructed expressions- Returns:
- the default container
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getNameChecker
Get the name checker used by this parser- Returns:
- the name checker (specific to XML 1.0o
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nextToken
Read the next token, catching any exception thrown by the tokenizer- Throws:
XPathException
- if an invalid token is found
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expect
Expect a given token; fail if the current token is different. Note that this method does not read any tokens.- Parameters:
token
- the expected token- Throws:
XPathException
- if the current token is not the expected token
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grumble
Report a syntax error (a static error with error code XP0003)- Parameters:
message
- the error message- Throws:
XPathException
- always thrown: an exception containing the supplied message
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grumble
Report a static error- Parameters:
message
- the error messageerrorCode
- the error code- Throws:
XPathException
- always thrown: an exception containing the supplied message
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grumble
Report a static error, with location information- Parameters:
message
- the error messageerrorCode
- the error codeoffset
- the coded location of the error, or -1 if the location of the current token should be used- Throws:
XPathException
- always thrown: an exception containing the supplied message
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grumble
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grumble
Report a static error- Parameters:
message
- the error messageerrorCode
- the error codeoffset
- the coded location of the error, or -1 if the location of the current token should be used- Throws:
XPathException
- always thrown: an exception containing the supplied message
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warning
Output a warning message- Parameters:
message
- the text of the message- Throws:
XPathException
- if the message cannot be output
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setLanguage
Set the current language (XPath or XQuery, XSLT Pattern, or SequenceType)- Parameters:
language
- one of the constantsXPATH
,XQUERY
,XSLT_PATTERN
,SEQUENCE_TYPE
version
- The XPath or XQuery language version. For XQuery the value must be "1.0" or "3.0; for XPath it must be "2.0" or "3.0". Currently support for XQuery 3.0 and XPath 3.0 is incomplete: check the release notes.
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getLanguage
Get the current language (XPath or XQuery)- Returns:
- a string representation of the language being parsed, for use in error messages
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currentTokenDisplay
Display the current token in an error message- Returns:
- the display representation of the token
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parse
public Expression parse(String expression, int start, int terminator, int lineNumber, StaticContext env) throws XPathException Parse a string representing an expression. This will accept an XPath expression if called on an ExpressionParser, or an XQuery expression if called on a QueryParser.- Parameters:
expression
- the expression expressed as a Stringstart
- offset within the string where parsing is to startterminator
- character to treat as terminating the expressionlineNumber
- location of the start of the expression, for diagnosticsenv
- the static context for the expression- Returns:
- an Expression object representing the result of parsing
- Throws:
XPathException
- if the expression contains a syntax error
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customizeTokenizer
Callback to tailor the tokenizer- Parameters:
t
- the Tokenizer to be customized
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parseSequenceType
Parse a string representing a sequence type- Parameters:
input
- the string, which should conform to the XPath SequenceType productionenv
- the static context- Returns:
- a SequenceType object representing the type
- Throws:
XPathException
- if any error is encountered
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parseExpression
Parse a top-level Expression: ExprSingle ( ',' ExprSingle )*- Returns:
- the Expression object that results from parsing
- Throws:
XPathException
- if the expression contains a syntax error
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parseExprSingle
Parse an ExprSingle- Returns:
- the resulting subexpression
- Throws:
XPathException
- if any error is encountered
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parseBinaryExpression
Parse a binary expression, using operator precedence parsing. This is used to parse the part of the grammary consisting largely of binary operators distinguished by precedence: from "or expressions" down to "unary expressions". Algorithm for the mainstream binary operators is from Wikipedia article on precedence parsing; operator precedences are from the XQuery specification appendix B.- Parameters:
lhs
- Left-hand side "basic expression"minPrecedence
- the minimum precedence of an operator that is to be treated as not terminating the current expression- Returns:
- the parsed expression
- Throws:
XPathException
- if a static error is found
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parseTypeswitchExpression
Parse a Typeswitch Expression. This construct is XQuery-only, so the XPath version of this method throws an error unconditionally- Returns:
- the expression that results from the parsing
- Throws:
XPathException
- if a static error is found
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parseSwitchExpression
Parse a Switch Expression. This construct is XQuery-1.1 only, so the XPath and XQuery 1.0 versions of this method throw an error unconditionally- Returns:
- the expression that results from the parsing
- Throws:
XPathException
- if a static error is found
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parseValidateExpression
Parse a Validate Expression. This construct is XQuery-only, so the XPath version of this method throws an error unconditionally- Returns:
- the parsed expression; except that this version of the method always throws an exception
- Throws:
XPathException
- if a static error is found
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parseExtensionExpression
Parse an Extension Expression This construct is XQuery-only, so the XPath version of this method throws an error unconditionally- Returns:
- the parsed expression; except that this version of the method always throws an exception
- Throws:
XPathException
- if a static error is found
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parseTypePattern
Parse a Type Pattern This construct is used only in XSLT patterns, so the XPath version of this method throws an error unconditionally- Returns:
- the parsed expression; except that this version of the method always throws an exception
- Throws:
XPathException
- if a static error is found
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parseTryCatchExpression
Parse a try/catch Expression This construct is XQuery-1.1 only, so the XPath version of this method throws an error unconditionally- Returns:
- the parsed expression; except that this version of the method always throws an exception
- Throws:
XPathException
- if a static error is found
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parseFLWORExpression
Parse a FOR or LET expression: for $x in expr (',' $y in expr)* 'return' expr let $x := expr (', $y := expr)* 'return' expr This version of the method handles the subset of the FLWOR syntax allowed in XPath- Returns:
- the resulting subexpression
- Throws:
XPathException
- if any error is encountered
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parseSequenceType
Parse the sequence type production. The QName must be the name of a built-in schema-defined data type.- Returns:
- the resulting subexpression
- Throws:
XPathException
- if any error is encountered
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parseItemType
Parse an ItemType within a SequenceType- Returns:
- the ItemType after parsing
- Throws:
XPathException
- if a static error is found
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parseFunctionItemType
Get the item type used for function items (XPath 3.0 higher order functions)- Returns:
- the item type representing a function item
- Throws:
XPathException
- if a static error occurs (including the case where XPath 3.0 syntax is not enabled)
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parseMapItemType
Get the item type used for map items (XPath 3.0)- Returns:
- the item type of the map
- Throws:
XPathException
- if a parsing error occurs or if the map syntax is not available
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parseParenthesizedItemType
Parse a parenthesized item type (XPath 3.0)- Returns:
- the item type
- Throws:
XPathException
- if a syntax error is found
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atStartOfRelativePath
protected boolean atStartOfRelativePath()Test whether the current token is one that can start a RelativePathExpression- Returns:
- the resulting subexpression
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disallowedAtStartOfRelativePath
protected boolean disallowedAtStartOfRelativePath()Test whether the current token is one that is disallowed after a "leading lone slash". These composite tokens have been parsed as operators, but are not allowed after "/" under the rules of erratum E24- Returns:
- the resulting subexpression
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parsePathExpression
Parse a PathExpresssion. This includes "true" path expressions such as A/B/C, and also constructs that may start a path expression such as a variable reference $name or a parenthesed expression (A|B). Numeric and string literals also come under this heading.- Returns:
- the resulting subexpression
- Throws:
XPathException
- if any error is encountered
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parseRelativePath
Parse a relative path (a sequence of steps). Called when the current token immediately follows a separator (/ or //), or an implicit separator (XYZ is equivalent to ./XYZ)- Returns:
- the resulting subexpression
- Throws:
XPathException
- if any error is encountered
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parseRemainingPath
Parse the remaining steps of an absolute path expression (one starting in "/" or "//"). Note that the token immediately after the "/" or "//" has already been read, and in the case of "/", it has been confirmed that we have a path expression starting with "/" rather than a standalone "/" expression.- Parameters:
start
- the initial implicit expression: root() in the case of "/", root()/descendant-or-self::node in the case of "//"- Returns:
- the completed path expression
- Throws:
XPathException
- if a static error is found
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parseStepExpression
Parse a step (including an optional sequence of predicates)- Parameters:
firstInPattern
- true only if we are parsing the first step in a RelativePathPattern in the XSLT Pattern syntax- Returns:
- the resulting subexpression
- Throws:
XPathException
- if any error is encountered
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parsePredicate
Parse the expression within a predicate. A separate method so it can be overridden- Returns:
- the expression within the predicate
- Throws:
XPathException
- if a static error is found
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parseBasicStep
Parse a basic step expression (without the predicates)- Parameters:
firstInPattern
- true only if we are parsing the first step in a RelativePathPattern in the XSLT Pattern syntax- Returns:
- the resulting subexpression
- Throws:
XPathException
- if any error is encountered
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testPermittedAxis
- Throws:
XPathException
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parseNumericLiteral
- Throws:
XPathException
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parseStringLiteral
- Throws:
XPathException
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parseVariableReference
- Throws:
XPathException
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makeStringLiteral
Method to make a string literal from a token identified as a string literal. This is trivial in XPath, but in XQuery the method is overridden to identify pseudo-XML character and entity references. Note that the job of handling doubled string delimiters is done by the tokenizer.- Parameters:
currentTokenValue
- the token as read (excluding quotation marks)- Returns:
- The string value of the string literal
- Throws:
XPathException
- if a static error is found
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parseConstructor
Parse a node constructor. This is allowed only in XQuery, so the method throws an error for XPath.- Returns:
- the expression that results from the parsing
- Throws:
XPathException
- if a static error occurs
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parseDynamicFunctionCall
Parse a dynamic function call- Parameters:
functionItem
- the expression that determines the function to be called- Returns:
- the expression that results from the parsing
- Throws:
XPathException
- if a static error is found
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parseNodeTest
Parse a NodeTest. One of QName, prefix:*, *:suffix, *, text(), node(), comment(), or processing-instruction(literal?), or element(~,~), attribute(~,~), etc.- Parameters:
nodeType
- the node type being sought if one is specified- Returns:
- the resulting NodeTest object
- Throws:
XPathException
- if any error is encountered
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isNamespaceTestAllowed
protected boolean isNamespaceTestAllowed()Ask whether the syntax namespace-node() is allowed in a node kind test.- Returns:
- false (currently allowed only in XQuery 3.0)
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parseMapExpression
Parse a map expression. Requires XPath/XQuery 3.0 Provisional syntax map { expr := expr (, expr := expr )*} }- Returns:
- the map expression
- Throws:
XPathException
- if a static error occurs
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parseFunctionCall
Parse a function call. function-name '(' ( Expression (',' Expression )* )? ')'- Returns:
- the resulting subexpression
- Throws:
XPathException
- if any error is encountered
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reportMissingFunction
public Expression reportMissingFunction(int offset, StructuredQName functionName, Expression[] arguments) throws XPathException - Throws:
XPathException
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resolveFunctionName
Interpret a function name, returning it as a resolved QName- Parameters:
fname
- the lexical QName used as the function name; or an EQName presented by the tokenizer as a name in Clark notation- Returns:
- the Structured QName obtained by resolving any prefix in the function name
- Throws:
XPathException
- if the supplied name is not a valid QName or if its prefix is not in scope
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parseFunctionArgument
Parse an argument to a function call. Separate method so it can be overridden. With higher-order-function syntax in XPath 3.0/XQuery 3.0, this returns null if the pseudo-argument "?" is found.- Returns:
- the Expression used as the argument, or null if the argument is the place-holder "?"
- Throws:
XPathException
- if the argument expression does not parse correctly
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parseLiteralFunctionItem
Parse a literal function item (introduced in XQuery 1.1) Syntax: QName # integer The QName and # have already been read- Returns:
- an ExternalObject representing the function item
- Throws:
XPathException
- if a static error is encountered
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parseInlineFunction
Parse an inline function "function" "(" ParamList? ")" ("as" SequenceType)? EnclosedExpr On entry, "function (" has already been read- Returns:
- the parsed inline function
- Throws:
XPathException
- if a syntax error is found
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makeCurriedFunction
protected Expression makeCurriedFunction(int offset, StructuredQName name, Expression[] args, IntSet placeMarkers) throws XPathException Process a function call in which one or more of the argument positions are represented as "?" placemarkers (indicating partial application or currying)- Parameters:
offset
- the position of the expression in the source textname
- the function name (as if there were no currying)args
- the arguments (with EmptySequence in the placemarker positions)placeMarkers
- the positions of the placemarkers @return the curried function- Returns:
- the curried function
- Throws:
XPathException
- if a static error is found
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getRangeVariables
Get the stack of in-scope range variables- Returns:
- the stack of variables
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setRangeVariables
Set a new stack of in-scope range variables- Parameters:
variables
- the stack of variables
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declareRangeVariable
Declare a range variable (record its existence within the parser). A range variable is a variable declared within an expression, as distinct from a variable declared in the context.- Parameters:
declaration
- the variable declaration to be added to the stack- Throws:
XPathException
- if any error is encountered
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undeclareRangeVariable
public void undeclareRangeVariable()Note when the most recently declared range variable has gone out of scope -
findRangeVariable
Locate a range variable with a given name. (By "range variable", we mean a variable declared within the expression where it is used.)- Parameters:
qName
- identifies the name of the range variable- Returns:
- null if not found (this means the variable is probably a context variable); otherwise the relevant RangeVariable
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setRangeVariableStack
Set the range variable stack. Used when parsing a nested subexpression inside an attribute constructor.- Parameters:
stack
- the stack to be used for local variables declared within the expression
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makeNameCode
Make a NameCode, using the static context for namespace resolution- Parameters:
qname
- The name as written, in the form "[prefix:]localname"; alternatively, a QName in Clark notation ({uri}local)useDefault
- Defines the action when there is no prefix. If true, use the default namespace URI for element names. If false, use no namespace URI (as for attribute names).- Returns:
- the namecode, which can be used to identify this name in the name pool
- Throws:
XPathException
- if the name is invalid, or the prefix undeclared
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makeNameCodeSilently
public final int makeNameCodeSilently(String qname, boolean useDefault) throws XPathException, QNameException Make a NameCode, using the static context for namespace resolution. This variant of the method does not call "grumble" to report any errors to the ErrorListener, it only reports errors by throwing exceptions. This allows the caller to control the message output.- Parameters:
qname
- The name as written, in the form "[prefix:]localname"useDefault
- Defines the action when there is no prefix. If true, use the default namespace URI for element names. If false, use no namespace URI (as for attribute names).- Returns:
- the namecode, which can be used to identify this name in the name pool
- Throws:
XPathException
- if the name is invalid, or the prefix undeclaredQNameException
- if the name is not a lexically valid QName
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makeStructuredQName
public final StructuredQName makeStructuredQName(String qname, boolean useDefault) throws XPathException Make a Structured QName, using the static context for namespace resolution- Parameters:
qname
- The name as written, in the form "[prefix:]localname"; alternatively, a QName in Clark format ({uri}local)useDefault
- Defines the action when there is no prefix. If true, use the default namespace URI for element names. If false, use no namespace URI (as for attribute names).- Returns:
- the QName as an instance of StructuredQName
- Throws:
XPathException
- if the name is invalid, or the prefix undeclared
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makeNodeName
public final NodeName makeNodeName(String qname, boolean useDefault) throws XPathException, QNameException Make a FingerprintedQName, using the static context for namespace resolution- Parameters:
qname
- The name as written, in the form "[prefix:]localname"; alternatively, a QName in Clark format ({uri}local)useDefault
- Defines the action when there is no prefix. If true, use the default namespace URI for element names. If false, use no namespace URI (as for attribute names).- Returns:
- the fingerprinted QName
- Throws:
XPathException
- if the name is invalid, or the prefix undeclaredQNameException
- if the supplied qname is not a lexically valid QName
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makeNameTest
public NameTest makeNameTest(short nodeType, String qname, boolean useDefault) throws XPathException Make a NameTest, using the static context for namespace resolution- Parameters:
nodeType
- the type of node required (identified by a constant in class Type)qname
- the lexical QName of the required node; alternatively, a QName in Clark notation ({uri}local)useDefault
- true if the default namespace should be used when the QName is unprefixed- Returns:
- a NameTest, representing a pattern that tests for a node of a given node kind and a given name
- Throws:
XPathException
- if the QName is invalid
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makeNamespaceTest
Make a NamespaceTest (name:*)- Parameters:
nodeType
- integer code identifying the type of node requiredprefix
- the namespace prefix- Returns:
- the NamespaceTest, a pattern that matches all nodes in this namespace
- Throws:
XPathException
- if the namespace prefix is not declared
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makeLocalNameTest
Make a LocalNameTest (*:name)- Parameters:
nodeType
- the kind of node to be matchedlocalName
- the requred local name- Returns:
- a LocalNameTest, a pattern which matches all nodes of a given local name, regardless of namespace
- Throws:
XPathException
- if the local name is invalid
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setLocation
Set location information on an expression. At present this consists of a simple line number. Needed mainly for XQuery.- Parameters:
exp
- the expression whose location information is to be set
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setLocation
Set location information on an expression. At present only the line number is retained. Needed mainly for XQuery. This version of the method supplies an explicit offset (character position within the expression or query), which the tokenizer can convert to a line number and column number.- Parameters:
exp
- the expression whose location information is to be setoffset
- the character position within the expression (ignoring newlines)
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setLocation
Set location information on a clause of a FLWOR expression. At present only the line number is retained. Needed mainly for XQuery. This version of the method supplies an explicit offset (character position within the expression or query), which the tokenizer can convert to a line number and column number.- Parameters:
clause
- the clause whose location information is to be setoffset
- the character position within the expression (ignoring newlines)
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makeTracer
If tracing, wrap an expression in a trace instruction- Parameters:
startOffset
- the position of the expression in the soruceexp
- the expression to be wrappedconstruct
- integer constant identifying the kind of constructqName
- the name of the construct (if applicable)- Returns:
- the expression that does the tracing
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isKeyword
Test whether the current token is a given keyword.- Parameters:
s
- The string to be compared with the current token- Returns:
- true if they are the same
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normalizeEQName
Normalize an EQName. This is written in the source code in the form "uri":local, but by the time it gets here it has been converted to Clark format {uri}local. This method collapses whitespace within the URI- Parameters:
s
- the EQName in the form of a Clark name- Returns:
- the normalized EQName
- Throws:
XPathException
- so that the XQuery implementation in a subclass can do so.
-
setScanOnly
public void setScanOnly(boolean scanOnly) Set that we are parsing in "scan only"- Parameters:
scanOnly
- true if parsing is to proceed in scan-only mode. In this mode namespace bindings are not yet known, so no attempt is made to look up namespace prefixes.
-