orc.ast.simple
Class Let

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

public class Let
extends Expression

Field Summary

java.util.List<Argument>

args

Constructor Summary

Let()

Let(Argument arg)

Let(java.util.List<Argument> args)

Method Summary

Expr	convert(Env<Var> vars, Env<java.lang.String> typevars) 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

suball, subvar

Methods inherited from class java.lang.Object

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

Field Detail

args

public java.util.List<Argument> args

Constructor Detail

Let

public Let(java.util.List<Argument> args)

Let

public Let(Argument arg)

Let

public Let()

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

Returns:

A new copy of the expression with the substitution performed

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,
                    Env<java.lang.String> typevars)
             throws UnboundVariableException

Description copied from class: Expression

Converts abstract syntax tree into a serializable form, used to generate portable .oil (Orc Intermediate Language) files. Note that the typevars environment is a content-addressable environment of strings. Type vars are represented as strings for simplicity, because unlike regular vars, there are not yet any compiler steps which generate temporary type variables.

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.

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

Returns:

A new node.

Throws:

UnboundVariableException