Package com.saxonica.ee.bytecode

Class LetExpressionCompiler

java.lang.Object

com.saxonica.ee.bytecode.ExpressionCompiler

com.saxonica.ee.bytecode.ToIteratorCompiler

com.saxonica.ee.bytecode.LetExpressionCompiler

public class LetExpressionCompiler
extends ToIteratorCompiler

Generate bytecode for evaluation of an LetExpression

Constructor Summary

Constructors

Constructor	Description
LetExpressionCompiler()

Method Summary

Modifier and Type	Method	Description
static void	compileCommonExpr(CompilerService compiler, Expression exp, Evaluator evaluationMode, int refCount)	Helper method to generate bytecode the same for both compileToIterator and compileToItem Precondition: none.
void	compileToItem(CompilerService compiler, Expression expression)	Generate bytecode to evaluate the LetExpression as an Item Precondition: none.
void	compileToIterator(CompilerService compiler, Expression expression)	Generate bytecode to evaluate the LetExpression as an Iterator Precondition: none.
void	compileToPush(CompilerService compiler, Expression expression)	Generate bytecode to evaluate the LetExpression as an Item Precondition: none.

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

compileToBoolean

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

LetExpressionCompiler

public LetExpressionCompiler()

Method Detail

compileToItem

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

Generate bytecode to evaluate the LetExpression as an Item Precondition: none. Postcondition: the stack contains an Item representing the result of the expression

Overrides:

compileToItem in class ToIteratorCompiler

Parameters:

compiler - the compiler service

expression - the expression to be compiled

Throws:

CannotCompileException - if the expression cannot be compiled to bytecode

compileToPush

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

Generate bytecode to evaluate the LetExpression as an Item Precondition: none. Postcondition: the stack contains an Item representing the result of the expression

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 LetExpression as an Iterator Precondition: none. Postcondition: the stack contains an Item 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

compileCommonExpr

public static void compileCommonExpr(CompilerService compiler,
                                     Expression exp,
                                     Evaluator evaluationMode,
                                     int refCount)
                              throws CannotCompileException

Helper method to generate bytecode the same for both compileToIterator and compileToItem Precondition: none. Postcondition: the stack contains the variable(s) already evaluated in the form of a Sequence object

Parameters:

compiler - the compiler service

exp - the expression to be compiled

evaluationMode - the evaluation mode

refCount - the nominal count of references to this variable

Throws:

CannotCompileException - if the expression cannot be compiled to bytecode