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com.memoire.silk
Class SilkEnvironment  

java.lang.Object
  com.memoire.silk.SilkSchemeUtils
      com.memoire.silk.SilkEnvironment

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public class SilkEnvironment

extends SilkSchemeUtils

SilkEnvironments allow you to look up the value of a variable, given its name. Keep a list of variables and values, and a pointer to the parent environment. If a variable list ends in a symbol rather than null, it means that symbol is bound to the remainder of the values list.

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Field Summary
SilkEnvironment	parent
java.lang.Object	vals
java.lang.Object	vars

 

Fields inherited from class com.memoire.silk.SilkSchemeUtils

FALSE, ONE, TRUE, ZERO

 

Constructor Summary

SilkEnvironment()           Construct an empty environment: no bindings.

SilkEnvironment(java.lang.Object vars, java.lang.Object vals, SilkEnvironment parent)           A constructor to extend an environment with var/val pairs.

 

Method Summary
java.lang.Object	define(java.lang.Object var, java.lang.Object val)           Add a new variable,value pair to this environment.
SilkEnvironment	defPrim(java.lang.String name, int id, int minArgs)
SilkEnvironment	defPrim(java.lang.String name, int id, int minArgs, int maxArgs)
java.lang.Object	lookup(java.lang.String symbol)           Find the value of a symbol, in this environment or a parent.
(package private)  boolean	numberArgsOK(java.lang.Object vars, java.lang.Object vals)           See if there is an appropriate number of vals for these vars.
java.lang.Object	set(java.lang.Object var, java.lang.Object val)           Set the value of an existing variable

 

Methods inherited from class com.memoire.silk.SilkSchemeUtils

chr, chr, cons, equal, eqv, error, first, inPort, length, list, list, listStar, listToString, listToVector, num, num, outPort, p, p, rest, reverse, second, setFirst, setRest, str, stringify, stringify, stringify, sym, third, truth, truth, vec, vectorToList, warn, write

 

Methods inherited from class java.lang.Object

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

 

Field Detail

vars

public java.lang.Object vars

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vals

public java.lang.Object vals

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parent

public SilkEnvironment parent

Constructor Detail

SilkEnvironment

public SilkEnvironment(java.lang.Object vars,
                       java.lang.Object vals,
                       SilkEnvironment parent)

A constructor to extend an environment with var/val pairs.

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SilkEnvironment

public SilkEnvironment()

Construct an empty environment: no bindings.

Method Detail

lookup

public java.lang.Object lookup(java.lang.String symbol)

Find the value of a symbol, in this environment or a parent.

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define

public java.lang.Object define(java.lang.Object var,
                               java.lang.Object val)

Add a new variable,value pair to this environment.

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set

public java.lang.Object set(java.lang.Object var,
                            java.lang.Object val)

Set the value of an existing variable

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defPrim

public SilkEnvironment defPrim(java.lang.String name,
                               int id,
                               int minArgs)

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defPrim

public SilkEnvironment defPrim(java.lang.String name,
                               int id,
                               int minArgs,
                               int maxArgs)

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numberArgsOK

boolean numberArgsOK(java.lang.Object vars,
                     java.lang.Object vals)

See if there is an appropriate number of vals for these vars.

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