orc.ast.simple
Class Where

java.lang.Object
  orc.ast.simple.Expression
      orc.ast.simple.Where

public class Where
extends Expression

Constructor Summary

Where(Expression left, Expression right, Var v)

Method Summary

Expr	convert(Env<Var> vars) Converts abstract syntax tree into a serializable form, used to generate portable .oil (Orc Intermediate Language) files.
Expression	subst(Argument a, NamedVar x) Performs the substitution [a/x], replacing occurrences of the free variable x with the new argument a (which could be any argument, including another variable).
java.util.Set<Var>	vars() Find the set of all unbound Vars (note: not FreeVars) in this expression.

Methods inherited from class orc.ast.simple.Expression

compile, suball

Methods inherited from class java.lang.Object

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

Constructor Detail

Where

public Where(Expression left,
             Expression right,
             Var v)

Method Detail

subst

public Expression subst(Argument a,
                        NamedVar x)

Description copied from class: Expression

Performs the substitution [a/x], replacing occurrences of the free variable x with the new argument a (which could be any argument, including another variable).

Specified by:

subst in class Expression

Parameters:

a - The replacing variable or value

x - The free variable whose occurrences will be replaced

vars

public java.util.Set<Var> vars()

Description copied from class: Expression

Find the set of all unbound Vars (note: not FreeVars) in this expression.

Specified by:

vars in class Expression

convert

public Expr convert(Env<Var> vars)
             throws CompilationException

Description copied from class: Expression

Converts abstract syntax tree into a serializable form, used to generate portable .oil (Orc Intermediate Language) files.

Specified by:

convert in class Expression

Parameters:

vars - The vars environment, used in content addressable mode to find the appropriate deBruijn index of a var.

Returns:

A new node.

Throws:

CompilationException