Package com.googlecode.htmlcompressor.compressor

Class ClosureJavaScriptCompressor

java.lang.Object

com.googlecode.htmlcompressor.compressor.ClosureJavaScriptCompressor

All Implemented Interfaces:

Compressor

public class ClosureJavaScriptCompressor
extends Object
implements Compressor

Basic JavaScript compressor implementation using Google Closure Compiler that could be used by HtmlCompressor for inline JavaScript compression.

Author:

Sergiy Kovalchuk

See Also:

HtmlCompressor.setJavaScriptCompressor(Compressor), Google Closure Compiler

Field Summary

Fields

Modifier and Type	Field	Description
static String	COMPILATION_LEVEL_ADVANCED	The Constant COMPILATION_LEVEL_ADVANCED.
static String	COMPILATION_LEVEL_SIMPLE	The Constant COMPILATION_LEVEL_SIMPLE.
static String	COMPILATION_LEVEL_WHITESPACE	The Constant COMPILATION_LEVEL_WHITESPACE.

Constructor Summary

Constructors

Constructor	Description
ClosureJavaScriptCompressor()	Instantiates a new closure java script compressor.
ClosureJavaScriptCompressor(com.google.javascript.jscomp.CompilationLevel compilationLevel)	Instantiates a new closure java script compressor.

Method Summary

Modifier and Type	Method	Description
String	compress(String source)	The main method that compresses the given source and returns a compressed result.
com.google.javascript.jscomp.CompilationLevel	getCompilationLevel()	Returns level of optimization that is applied when compiling JavaScript code.
com.google.javascript.jscomp.CompilerOptions	getCompilerOptions()	Returns options that are used by the Closure compiler.
List<com.google.javascript.jscomp.SourceFile>	getExterns()	Returns SourceFile used as a reference during the compression at CompilationLevel.ADVANCED_OPTIMIZATIONS level.
Level	getLoggingLevel()	Returns logging level used by the Closure compiler.
com.google.javascript.jscomp.WarningLevel	getWarningLevel()	Returns WarningLevel used by the Closure compiler.
boolean	isCustomExternsOnly()	Returns true if default externs defined inside Closure's jar are ignored and only user defined ones are used.
void	setCompilationLevel(com.google.javascript.jscomp.CompilationLevel compilationLevel)	Sets level of optimization that should be applied when compiling JavaScript code.
void	setCompilerOptions(com.google.javascript.jscomp.CompilerOptions compilerOptions)	Sets options that will be used by the Closure compiler.
void	setCustomExternsOnly(boolean customExternsOnly)	If set to true, default externs defined inside Closure's jar will be ignored and only user defined ones will be used.
void	setExterns(List<com.google.javascript.jscomp.SourceFile> externs)	Sets external JavaScript files that are used as a reference for function declarations if CompilationLevel.ADVANCED_OPTIMIZATIONS compression level is used.
void	setLoggingLevel(Level loggingLevel)	Sets logging level for the Closure compiler.
void	setWarningLevel(com.google.javascript.jscomp.WarningLevel warningLevel)	Indicates the amount of information you want from the compiler about possible problems in your code.

Methods inherited from class java.lang.Object

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

Field Detail

COMPILATION_LEVEL_SIMPLE

public static final String COMPILATION_LEVEL_SIMPLE

The Constant COMPILATION_LEVEL_SIMPLE.

See Also:

Constant Field Values

COMPILATION_LEVEL_ADVANCED

public static final String COMPILATION_LEVEL_ADVANCED

The Constant COMPILATION_LEVEL_ADVANCED.

See Also:

Constant Field Values

COMPILATION_LEVEL_WHITESPACE

public static final String COMPILATION_LEVEL_WHITESPACE

The Constant COMPILATION_LEVEL_WHITESPACE.

See Also:

Constant Field Values

Constructor Detail

ClosureJavaScriptCompressor

public ClosureJavaScriptCompressor()

Instantiates a new closure java script compressor.

ClosureJavaScriptCompressor

public ClosureJavaScriptCompressor(com.google.javascript.jscomp.CompilationLevel compilationLevel)

Instantiates a new closure java script compressor.

Parameters:

compilationLevel - the compilation level

Method Detail

compress

public String compress(String source)

Description copied from interface: Compressor

The main method that compresses the given source and returns a compressed result.

Specified by:

compress in interface Compressor

Parameters:

source - The source to compress.

Returns:

Compressed result.

getCompilationLevel

public com.google.javascript.jscomp.CompilationLevel getCompilationLevel()

Returns level of optimization that is applied when compiling JavaScript code.

Returns:

CompilationLevel that is applied when compiling JavaScript code.

See Also:

CompilationLevel

setCompilationLevel

public void setCompilationLevel(com.google.javascript.jscomp.CompilationLevel compilationLevel)

Sets level of optimization that should be applied when compiling JavaScript code. If none is provided, CompilationLevel.SIMPLE_OPTIMIZATIONS will be used by default.

Warning: Using CompilationLevel.ADVANCED_OPTIMIZATIONS could break inline JavaScript if externs are not set properly.

Parameters:

compilationLevel - Optimization level to use, could be set to CompilationLevel.ADVANCED_OPTIMIZATIONS, CompilationLevel.SIMPLE_OPTIMIZATIONS, CompilationLevel.WHITESPACE_ONLY

See Also:

Advanced Compilation and Externs, Closure Compiler Compilation Levels, CompilationLevel

getCompilerOptions

public com.google.javascript.jscomp.CompilerOptions getCompilerOptions()

Returns options that are used by the Closure compiler.

Returns:

CompilerOptions that are used by the compiler

See Also:

CompilerOptions

setCompilerOptions

public void setCompilerOptions(com.google.javascript.jscomp.CompilerOptions compilerOptions)

Sets options that will be used by the Closure compiler. If none is provided, default options constructor will be used: new CompilerOptions().

Parameters:

compilerOptions - CompilerOptions that will be used by the compiler

See Also:

CompilerOptions

getLoggingLevel

public Level getLoggingLevel()

Returns logging level used by the Closure compiler.

Returns:

Level of logging used by the Closure compiler

setLoggingLevel

public void setLoggingLevel(Level loggingLevel)

Sets logging level for the Closure compiler.

Parameters:

loggingLevel - logging level for the Closure compiler.

See Also:

Level

getExterns

public List<com.google.javascript.jscomp.SourceFile> getExterns()

Returns SourceFile used as a reference during the compression at CompilationLevel.ADVANCED_OPTIMIZATIONS level.

Returns:

SourceFile used as a reference during compression

setExterns

public void setExterns(List<com.google.javascript.jscomp.SourceFile> externs)

Sets external JavaScript files that are used as a reference for function declarations if CompilationLevel.ADVANCED_OPTIMIZATIONS compression level is used.

A number of default externs defined inside Closure's jar will be used besides user defined ones, to use only user defined externs set setCustomExternsOnly(true)

Warning: Using CompilationLevel.ADVANCED_OPTIMIZATIONS could break inline JavaScript if externs are not set properly.

Parameters:

externs - SourceFile to use as a reference during compression

See Also:

setCompilationLevel(CompilationLevel), setCustomExternsOnly(boolean), Advanced Compilation and Externs, SourceFile

getWarningLevel

public com.google.javascript.jscomp.WarningLevel getWarningLevel()

Returns WarningLevel used by the Closure compiler.

Returns:

WarningLevel used by the Closure compiler

setWarningLevel

public void setWarningLevel(com.google.javascript.jscomp.WarningLevel warningLevel)

Indicates the amount of information you want from the compiler about possible problems in your code.

Parameters:

warningLevel - WarningLevel to use

See Also:

Google Closure Compiler

isCustomExternsOnly

public boolean isCustomExternsOnly()

Returns true if default externs defined inside Closure's jar are ignored and only user defined ones are used.

Returns:

true if default externs defined inside Closure's jar are ignored and only user defined ones are used

setCustomExternsOnly

public void setCustomExternsOnly(boolean customExternsOnly)

If set to true, default externs defined inside Closure's jar will be ignored and only user defined ones will be used.

Parameters:

customExternsOnly - true to skip default externs and use only user defined ones

See Also:

setExterns(List), setCompilationLevel(CompilationLevel)