edu.illinois.cs.cogcomp.lbjava.IR

Class AtMostQuantifierExpression

java.lang.Object

edu.illinois.cs.cogcomp.lbjava.IR.ASTNode

edu.illinois.cs.cogcomp.lbjava.IR.ConstraintExpression

edu.illinois.cs.cogcomp.lbjava.IR.QuantifiedConstraintExpression

edu.illinois.cs.cogcomp.lbjava.IR.AtMostQuantifierExpression

public class AtMostQuantifierExpression
extends QuantifiedConstraintExpression

An "at most" quantifier has the form:

atmost expression of argument in (expression) constraint-expression

where the first expression must evaluate to an int, the second expression must evaluate to a Collection, and the "at most" quantifier expression is sastisfied iff when taking settings of argument from the Collection, constraint-expression is satisfied at most as many times as the integer the first expression evaluates to.

Author:

Nick Rizzolo

Field Summary

Fields

Modifier and Type	Field and Description
Expression	upperBound (¬ø) This expression evaluates to an integer representing the maximum number of objects that must satisfy the child constraint expression in order for this quantified constraint expression to be satisfied.
boolean	upperBoundIsQuantified Filled in by SemanticAnalysis, this flag is set if upperBound contains any quantified variables.

Fields inherited from class edu.illinois.cs.cogcomp.lbjava.IR.QuantifiedConstraintExpression

argument, collection, collectionIsQuantified, constraint

Fields inherited from class edu.illinois.cs.cogcomp.lbjava.IR.ConstraintExpression

parenthesized

Fields inherited from class edu.illinois.cs.cogcomp.lbjava.IR.ASTNode

byteOffset, line, nodeID, symbolTable

Constructor Summary

Constructors

Constructor and Description
AtMostQuantifierExpression(int line, int byteOffset, Expression ub, Argument a, Expression c, ConstraintExpression co) Full constructor.
AtMostQuantifierExpression(TokenValue t, Expression ub, Argument a, Expression c, ConstraintExpression co) Parser's constructor.

Method Summary

Modifier and Type	Method and Description
Object	clone() Creates a new object with the same primitive data, and recursively creates new member data objects as well.
HashSet	getVariableTypes() Returns a set of Arguments storing the name and type of each variable that is a subexpression of this expression.
ASTNodeIterator	iterator() Returns an iterator used to successively access the children of this node.
void	runPass(Pass pass) Ensures that the correct run() method is called for this type of node.
void	write(StringBuffer buffer) Writes a string representation of this ASTNode to the specified buffer.

Methods inherited from class edu.illinois.cs.cogcomp.lbjava.IR.ConstraintExpression

containsQuantifiedVariable

Methods inherited from class edu.illinois.cs.cogcomp.lbjava.IR.ASTNode

toString

Methods inherited from class java.lang.Object

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

Field Detail

upperBound

public Expression upperBound

(¬ø) This expression evaluates to an integer representing the maximum number of objects that must satisfy the child constraint expression in order for this quantified constraint expression to be satisfied.

upperBoundIsQuantified

public boolean upperBoundIsQuantified

Filled in by SemanticAnalysis, this flag is set if upperBound contains any quantified variables.

Constructor Detail

AtMostQuantifierExpression

public AtMostQuantifierExpression(int line,
                                  int byteOffset,
                                  Expression ub,
                                  Argument a,
                                  Expression c,
                                  ConstraintExpression co)

Full constructor.

Parameters:

line - The line on which the source code represented by this node is found.

byteOffset - The byte offset from the beginning of the source file at which the source code represented by this node is found.

ub - The upper bound expression.

a - The quantification variable specification.

c - Evaluates to the collection of objects.

co - The quantified constraint.

AtMostQuantifierExpression

public AtMostQuantifierExpression(TokenValue t,
                                  Expression ub,
                                  Argument a,
                                  Expression c,
                                  ConstraintExpression co)

Parser's constructor. Line and byte offset information are taken from the token.

Parameters:

t - The token containing line and byte offset information.

ub - The upper bound expression.

a - The quantification variable specification.

c - Evaluates to the collection of objects.

co - The quantified constraint.

Method Detail

getVariableTypes

public HashSet getVariableTypes()

Returns a set of Arguments storing the name and type of each variable that is a subexpression of this expression. This method cannot be run before SemanticAnalysis runs.

Overrides:

getVariableTypes in class QuantifiedConstraintExpression

iterator

public ASTNodeIterator iterator()

Returns an iterator used to successively access the children of this node.

Overrides:

iterator in class QuantifiedConstraintExpression

Returns:

An iterator used to successively access the children of this node.

clone

public Object clone()

Creates a new object with the same primitive data, and recursively creates new member data objects as well.

Overrides:

clone in class ASTNode

Returns:

The clone node.

runPass

public void runPass(Pass pass)

Ensures that the correct run() method is called for this type of node.

Specified by:

runPass in class ASTNode

Parameters:

pass - The pass whose run() method should be called.

write

public void write(StringBuffer buffer)

Writes a string representation of this ASTNode to the specified buffer. The representation written is parsable by the LBJava compiler, but not very readable.

Specified by:

write in class ASTNode

Parameters:

buffer - The buffer to write to.