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silk
Class Symbol  

java.lang.Object
  silk.Symbol

All Implemented Interfaces:

java.io.Serializable

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public class Symbol

extends java.lang.Object

implements java.io.Serializable

In Silk 1.0 to 1.4, symbols were implemented as Strings. In 1.5, we add a Symbol class, with a field for the global value. This makes global lookup faster, but limits us to only one global environment.

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Field Summary
static Symbol	BEGIN
static Symbol	CAR
static Symbol	CDR
static Symbol	DEFINE
private  java.lang.Object	globalValue           Global value is stored with each symbol.
static Symbol	IF
static Symbol	LAMBDA
static Symbol	MACRO
private  java.lang.String	name
static Symbol	NEWLINE
static Symbol	NULL
static Symbol	OR
static Symbol	PACKAGE
static Symbol	QUASIQUOTE
static Symbol	QUOTE
static Symbol	SET
static Symbol	SPACE
static java.util.Hashtable	symbolTable           The symbolTable keeps a unique mapping from String name to Symbol.
static Symbol	UNQUOTE
static Symbol	UNQUOTE_SPLICING

 

Constructor Summary
private	Symbol(java.lang.String name)           Constructor.

 

Method Summary
java.lang.Object	getGlobalValue()
static Symbol	intern(java.lang.String name)           Intern a string: look up or make a symbol.
boolean	isDefined()
java.lang.Object	setGlobalValue(java.lang.Object newval)
java.lang.String	toString()           A symbol can be printed using its name.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

name

private java.lang.String name

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globalValue

private java.lang.Object globalValue

Global value is stored with each symbol.

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symbolTable

public static final java.util.Hashtable symbolTable

The symbolTable keeps a unique mapping from String name to Symbol.

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BEGIN

public static final Symbol BEGIN

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CAR

public static final Symbol CAR

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CDR

public static final Symbol CDR

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DEFINE

public static final Symbol DEFINE

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IF

public static final Symbol IF

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LAMBDA

public static final Symbol LAMBDA

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MACRO

public static final Symbol MACRO

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NEWLINE

public static final Symbol NEWLINE

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NULL

public static final Symbol NULL

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OR

public static final Symbol OR

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QUASIQUOTE

public static final Symbol QUASIQUOTE

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QUOTE

public static final Symbol QUOTE

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SET

public static final Symbol SET

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SPACE

public static final Symbol SPACE

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UNQUOTE

public static final Symbol UNQUOTE

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UNQUOTE_SPLICING

public static final Symbol UNQUOTE_SPLICING

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PACKAGE

public static final Symbol PACKAGE

Constructor Detail

Symbol

private Symbol(java.lang.String name)

Constructor. From outside the class, call Symbol.intern(name).

Method Detail

intern

public static Symbol intern(java.lang.String name)

Intern a string: look up or make a symbol.

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getGlobalValue

public java.lang.Object getGlobalValue()

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isDefined

public boolean isDefined()

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setGlobalValue

public java.lang.Object setGlobalValue(java.lang.Object newval)

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toString

public java.lang.String toString()

A symbol can be printed using its name. We don't do escape processing.

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