com.saxonica.ee.bytecode

Class SlashExpressionCompiler

java.lang.Object

com.saxonica.ee.bytecode.ExpressionCompiler

com.saxonica.ee.bytecode.ToIteratorCompiler

com.saxonica.ee.bytecode.SlashExpressionCompiler

public class SlashExpressionCompiler
extends ToIteratorCompiler

Generate bytecode for a call to a SlashExpression or an xsl:for-each instruction (These have the same run-time semantics)

Constructor Summary

Constructors

Constructor and Description
SlashExpressionCompiler()

Method Summary

Modifier and Type	Method and Description
void	compileToIterator(CompilerService compiler, Expression expression) Generate bytecode to evaluate the SlashExpression as a ContextMappingIterator Precondition: none.
void	compileToPush(CompilerService compiler, Expression expression) Generate bytecode to evaluate the expression in push mode Precondition: none.
static CompiledAxisMappingFunction	generateAxisMappingFunction(CompilerService compiler, AxisExpression step) Generate a mapping function for a given step expression
static CompiledContextMappingFunction	generateMappingFunction(CompilerService compiler, Expression step) Generate a mapping function for a given step expression

Methods inherited from class com.saxonica.ee.bytecode.ToIteratorCompiler

compileToBoolean, compileToItem

Methods inherited from class com.saxonica.ee.bytecode.ExpressionCompiler

allocateStatic, compileItemFromInt, compileToPrimitive, generateMethod, handleEmptyStringResult, printStackTop, verify, visitAnnotation, visitLineNumber

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SlashExpressionCompiler

public SlashExpressionCompiler()

Method Detail

compileToIterator

public void compileToIterator(CompilerService compiler,
                              Expression expression)
                       throws CannotCompileException

Generate bytecode to evaluate the SlashExpression as a ContextMappingIterator Precondition: none. Postcondition: the stack contains an iterator representing the result of the expression

Specified by:

compileToIterator in class ExpressionCompiler

Parameters:

compiler - the compiler service

expression - the expression to be compiled

Throws:

CannotCompileException - if the expression cannot be compiled to bytecode

generateMappingFunction

public static CompiledContextMappingFunction generateMappingFunction(CompilerService compiler,
                                                                     Expression step)
                                                              throws CannotCompileException

Generate a mapping function for a given step expression

Parameters:

compiler - the compiler service

step - the step expression to form the body of the mapping action

Throws:

CannotCompileException - if the expression cannot be compiled to bytecode

generateAxisMappingFunction

public static CompiledAxisMappingFunction generateAxisMappingFunction(CompilerService compiler,
                                                                      AxisExpression step)
                                                               throws CannotCompileException

Generate a mapping function for a given step expression

Parameters:

compiler - the compiler service

step - the step expression to form the body of the mapping action

Returns:

the mapping function

Throws:

CannotCompileException - if the expression cannot be compiled to bytecode

compileToPush

public void compileToPush(CompilerService compiler,
                          Expression expression)
                   throws CannotCompileException

Description copied from class: ExpressionCompiler

Generate bytecode to evaluate the expression in push mode Precondition: none. Postcondition: at execution time, the stack is unchanged, and the value of the expression has been written to the current receiver

Overrides:

compileToPush in class ToIteratorCompiler

Parameters:

compiler - the compiler service

expression - the expression to be compiled

Throws:

CannotCompileException - if the expression cannot be compiled to bytecode