Package com.saxonica.ee.bytecode

Class ForExpressionCompiler

java.lang.Object

com.saxonica.ee.bytecode.ExpressionCompiler

com.saxonica.ee.bytecode.ToIteratorCompiler

com.saxonica.ee.bytecode.ForExpressionCompiler

public class ForExpressionCompiler
extends ToIteratorCompiler

Generate bytecode for a call to the ForExpression()

Constructor Summary

Constructors

Constructor	Description
ForExpressionCompiler()

Method Summary

Modifier and Type	Method	Description
void	compileToIterator(CompilerService compiler, Expression expression)	Generate bytecode to evaluate the ForExpression as an iterator Precondition: none.
void	compileToPush(CompilerService compiler, Expression expression)	Generate bytecode to evaluate the ForExpression in push mode Precondition: none.
static java.lang.Class	generateSequenceMappingAction(CompilerService compiler, ForExpression expression, Expression action, int slotNumber)	Generate a mapping function with a map() method that returns an iterator over the results of one iteration of the loop

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

ForExpressionCompiler

public ForExpressionCompiler()

Method Detail

compileToPush

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

Generate bytecode to evaluate the ForExpression in push mode Precondition: none. Postcondition: the stack is empty

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

compileToIterator

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

Generate bytecode to evaluate the ForExpression as an iterator 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

generateSequenceMappingAction

public static java.lang.Class generateSequenceMappingAction(CompilerService compiler,
                                                            ForExpression expression,
                                                            Expression action,
                                                            int slotNumber)
                                                     throws CannotCompileException

Generate a mapping function with a map() method that returns an iterator over the results of one iteration of the loop

Parameters:

compiler - the CompilerService

expression - the "for" expression itself

action - the body of the "for" loop, which represents the expression to be compiled

slotNumber - the slot number

Throws:

CannotCompileException - if the expression cannot be compiled to bytecode