Expr Struct Reference

#include <txExpr.h>

Inheritance diagram for Expr:

[legend]

Collaboration diagram for Expr:

[legend]

List of all members.

Public Types
enum	ExprType {   LOCATIONSTEP_EXPR, PATH_EXPR, UNION_EXPR, LITERAL_EXPR,   OTHER_EXPR }
	Returns the type of this expression. More...
enum	{   NODESET_RESULT = 0x01, BOOLEAN_RESULT = 0x02, NUMBER_RESULT = 0x04, STRING_RESULT = 0x08,   RTF_RESULT = 0x10, ANY_RESULT = 0xFFFF }
enum	{   NO_CONTEXT = 0x00, NODE_CONTEXT = 0x01, POSITION_CONTEXT = 0x02, SIZE_CONTEXT = 0x04,   NODESET_CONTEXT = POSITION_CONTEXT | SIZE_CONTEXT, VARIABLES_CONTEXT = 0x08, PRIVATE_CONTEXT = 0x10, ANY_CONTEXT = 0xFFFF }
typedef PRUint16	ResultType
	Returns the type or types of results this Expr return.
typedef PRUint16	ContextSensitivity
Public Member Functions
	Expr ()
virtual	~Expr ()
virtual nsresult	evaluate (txIEvalContext *aContext, txAExprResult **aResult)=0
	Evaluates this Expr based on the given context node and processor state.
virtual ExprType	getType ()
virtual ResultType	getReturnType ()=0
PRBool	canReturnType (ResultType aType)
virtual PRBool	isSensitiveTo (ContextSensitivity aContexts)=0
	Returns true if this expression is sensitive to *any* of the requested contexts in aContexts.
virtual Expr *	getSubExprAt (PRUint32 aPos)=0
	Returns sub-expression at given position.
virtual void	setSubExprAt (PRUint32 aPos, Expr *aExpr)=0
	Replace sub-expression at given position.
virtual nsresult	evaluateToBool (txIEvalContext *aContext, PRBool &aResult)
virtual nsresult	evaluateToString (txIEvalContext *aContext, nsString &aResult)
virtual void	toString (nsAString &str)=0
	Returns the String representation of this Expr.
Public Attributes
u8	op
char	affinity
u16	flags
CollSeq *	pColl
Expr *	pLeft
Expr *	pRight
ExprList *	pList
Token	token
Token	span
int	iTable
int	iColumn
AggInfo *	pAggInfo
int	iAgg
int	iRightJoinTable
Select *	pSelect
Table *	pTab
int	nHeight
Schema *	pSchema

---

Member Typedef Documentation

typedef PRUint16 Expr::ResultType

typedef PRUint16 Expr::ContextSensitivity

---

Member Enumeration Documentation

enum Expr::ExprType

Enumerator:

LOCATIONSTEP_EXPR
PATH_EXPR
UNION_EXPR
LITERAL_EXPR
OTHER_EXPR

anonymous enum

Enumerator:

NODESET_RESULT
BOOLEAN_RESULT
NUMBER_RESULT
STRING_RESULT
RTF_RESULT
ANY_RESULT

anonymous enum

Enumerator:

NO_CONTEXT
NODE_CONTEXT
POSITION_CONTEXT
SIZE_CONTEXT
NODESET_CONTEXT
VARIABLES_CONTEXT
PRIVATE_CONTEXT
ANY_CONTEXT

---

Constructor & Destructor Documentation

Expr::Expr

(

)

[inline]

virtual Expr::~Expr

(

)

[inline, virtual]

---

Member Function Documentation

virtual nsresult Expr::evaluate	(	txIEvalContext *	aContext,
		txAExprResult **	aResult
	)			[pure virtual]

Parameters:

	context	the context node for evaluation of this Expr
	ps	the ContextState containing the stack information needed for evaluation

Returns:

the result of the evaluation

virtual ExprType Expr::getType

(

)

[inline, virtual]

virtual ResultType Expr::getReturnType

(

)

[pure virtual]

PRBool Expr::canReturnType

(

ResultType

aType

)

[inline]

virtual PRBool Expr::isSensitiveTo

(

ContextSensitivity

aContexts

)

[pure virtual]

virtual Expr* Expr::getSubExprAt

(

PRUint32

aPos

)

[pure virtual]

Implemented in FunctionCall.

virtual void Expr::setSubExprAt	(	PRUint32	aPos,
		Expr *	aExpr
	)			[pure virtual]

Does not delete the old expression, that is the responsibility of the caller.

Implemented in FunctionCall.

nsresult Expr::evaluateToBool	(	txIEvalContext *	aContext,
		PRBool &	aResult
	)			[virtual]

nsresult Expr::evaluateToString	(	txIEvalContext *	aContext,
		nsString &	aResult
	)			[virtual]

virtual void Expr::toString

(

nsAString &

str

)

[pure virtual]

Parameters:

dest

the String to use when creating the String representation. The String representation will be appended to any data in the destination String, to allow cascading calls to other toString() methods for Expressions.

Returns:

the String representation of this Expr.

---

Member Data Documentation

u8 Expr::op

char Expr::affinity

u16 Expr::flags

CollSeq * Expr::pColl

Expr * Expr::pLeft

Expr * Expr::pRight

ExprList * Expr::pList

Token Expr::token

Token Expr::span

int Expr::iTable

int Expr::iColumn

AggInfo * Expr::pAggInfo

int Expr::iAgg

int Expr::iRightJoinTable

Select * Expr::pSelect

Table * Expr::pTab

int Expr::nHeight

Schema* Expr::pSchema

---

The documentation for this struct was generated from the following files:

• content/xslt/src/xpath/txExpr.h
• db/sqlite3/src/sqlite3.c
• security/nss/lib/sqlite/sqlite3.c
• content/xslt/src/xpath/txExpr.cpp