com.google.gwt.dev.js

Class JsStringInterner

java.lang.Object

com.google.gwt.dev.js.JsStringInterner

public class JsStringInterner
extends Object

Interns conditionally either all String literals in a JsProgram, or Strings which exceed a certain usage count. Each unique String will be assigned to a variable in an appropriate program fragment and the JsStringLiteral will be replaced with a JsNameRef. This optimization is complete in a single pass, although it may be performed multiple times without duplicating the intern pool.

Field Summary

Fields

Modifier and Type	Field and Description
static String	PREFIX

Method Summary

Modifier and Type	Method and Description
static Map<JsName,String>	exec(JProgram jprogram, JsProgram program, boolean alwaysIntern) Apply interning of String literals to a JsProgram.
static boolean	exec(JsProgram program, JsBlock block, JsScope scope, boolean alwaysIntern) Intern String literals that occur within a JsBlock.

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, toString

Field Detail

PREFIX

public static final String PREFIX

See Also:

Constant Field Values

Method Detail

exec

public static Map<JsName,String> exec(JProgram jprogram,
                                      JsProgram program,
                                      boolean alwaysIntern)

Apply interning of String literals to a JsProgram. The symbol names for the interned strings will be defined within the program's top scope and the symbol declarations will be added as the first statement in the program's global block.

Parameters:

jprogram - the JProgram that has fragment dependency data for program

program - the JsProgram

alwaysIntern - true for browsers like IE which must always intern literals

Returns:

a map describing the interning that occurred

exec

public static boolean exec(JsProgram program,
                           JsBlock block,
                           JsScope scope,
                           boolean alwaysIntern)

Intern String literals that occur within a JsBlock. The symbol declarations will be added as the first statement in the block.

Parameters:

block - the block to visit

scope - the JsScope in which to reserve the new identifiers

alwaysIntern - true for browsers like IE which must always intern literals

Returns:

true if any changes were made to the block