org.lesscss

Class LessCompiler

java.lang.Object

org.lesscss.LessCompiler

All Implemented Interfaces:

AutoCloseable

public class LessCompiler
extends Object
implements AutoCloseable

The LESS compiler to compile LESS sources to CSS stylesheets.

The compiler uses Rhino (JavaScript implementation written in Java), Envjs (simulated browser environment written in JavaScript), and the official LESS JavaScript compiler.
Note that the compiler is not a Java implementation of LESS itself, but rather integrates the LESS JavaScript compiler within a Java/JavaScript browser environment provided by Rhino and Envjs.

The compiler comes bundled with the Envjs and LESS JavaScript, so there is no need to include them yourself. But if needed they can be overridden.

Basic code example:

 LessCompiler lessCompiler = new LessCompiler();
 String css = lessCompiler.compile("@color: #4D926F; #header { color: @color; }");
 

Author:

Marcel Overdijk

See Also:

LESS - The Dynamic Stylesheet language, Rhino - JavaScript for Java, Envjs - Bringing the Browser

Constructor Summary

Constructors

Constructor and Description
LessCompiler() Constructs a new LessCompiler.

Method Summary

Modifier and Type	Method and Description
void	close()
String	compile(File input) Compiles the LESS input File to CSS.
void	compile(File input, File output) Compiles the LESS input File to CSS and writes it to the specified output File.
void	compile(File input, File output, boolean force) Compiles the LESS input File to CSS and writes it to the specified output File.
String	compile(LessSource input) Compiles the input LessSource to CSS.
void	compile(LessSource input, File output) Compiles the input LessSource to CSS and writes it to the specified output File.
void	compile(LessSource input, File output, boolean force) Compiles the input LessSource to CSS and writes it to the specified output File.
String	compile(String input) Compiles the LESS input String to CSS.
List<URL>	getCustomJs() Returns the custom JavaScript files used by the compiler.
String	getEncoding() Returns the character encoding used by the compiler when writing the output File.
URL	getEnvJs() Returns the Envjs JavaScript file used by the compiler.
URL	getLessJs() Returns the LESS JavaScript file used by the compiler.
boolean	isCompress() Returns whether the compiler will compress the CSS.
void	setCompress(boolean compress) Sets the compiler to compress the CSS.
void	setCustomJs(List<URL> customJs) Sets the custom JavaScript files used by the compiler.
void	setCustomJs(URL customJs) Sets a single custom JavaScript file used by the compiler.
void	setEncoding(String encoding) Sets the character encoding used by the compiler when writing the output File.
void	setEnvJs(URL envJs) Sets the Envjs JavaScript file used by the compiler.
void	setLessJs(URL lessJs) Sets the LESS JavaScript file used by the compiler.

Methods inherited from class java.lang.Object

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

Constructor Detail

LessCompiler

public LessCompiler()

Constructs a new LessCompiler.

Method Detail

getEnvJs

public URL getEnvJs()

Returns the Envjs JavaScript file used by the compiler.

Returns:

The Envjs JavaScript file used by the compiler.

setEnvJs

public void setEnvJs(URL envJs)

Sets the Envjs JavaScript file used by the compiler. Must be set before init() is called.

Parameters:

envJs - The Envjs JavaScript file used by the compiler.

getLessJs

public URL getLessJs()

Returns the LESS JavaScript file used by the compiler.

Returns:

The LESS JavaScript file used by the compiler.

setLessJs

public void setLessJs(URL lessJs)

Sets the LESS JavaScript file used by the compiler. Must be set before init() is called.

Parameters:

lessJs - The LESS JavaScript file used by the compiler.

getCustomJs

public List<URL> getCustomJs()

Returns the custom JavaScript files used by the compiler.

Returns:

The custom JavaScript files used by the compiler.

setCustomJs

public void setCustomJs(URL customJs)

Sets a single custom JavaScript file used by the compiler. Must be set before init() is called.

Parameters:

customJs - A single custom JavaScript file used by the compiler.

setCustomJs

public void setCustomJs(List<URL> customJs)

Sets the custom JavaScript files used by the compiler. Must be set before init() is called.

Parameters:

customJs - The custom JavaScript files used by the compiler.

isCompress

public boolean isCompress()

Returns whether the compiler will compress the CSS.

Returns:

Whether the compiler will compress the CSS.

setCompress

public void setCompress(boolean compress)

Sets the compiler to compress the CSS.

Parameters:

compress - If true, sets the compiler to compress the CSS.

getEncoding

public String getEncoding()

Returns the character encoding used by the compiler when writing the output File.

Returns:

The character encoding used by the compiler when writing the output File.

setEncoding

public void setEncoding(String encoding)

Sets the character encoding used by the compiler when writing the output File. If not set the platform default will be used.

Parameters:

encoding - The character encoding used by the compiler when writing the output File.

close

public void close()

Specified by:

close in interface AutoCloseable

compile

public String compile(String input)
               throws LessException

Compiles the LESS input String to CSS.

Parameters:

input - The LESS input String to compile.

Returns:

The CSS.

Throws:

LessException

compile

public String compile(File input)
               throws IOException,
                      LessException

Compiles the LESS input File to CSS.

Parameters:

input - The LESS input File to compile.

Returns:

The CSS.

Throws:

IOException - If the LESS file cannot be read.

LessException

compile

public void compile(File input,
                    File output)
             throws IOException,
                    LessException

Compiles the LESS input File to CSS and writes it to the specified output File.

Parameters:

input - The LESS input File to compile.

output - The output File to write the CSS to.

Throws:

IOException - If the LESS file cannot be read or the output file cannot be written.

LessException

compile

public void compile(File input,
                    File output,
                    boolean force)
             throws IOException,
                    LessException

Compiles the LESS input File to CSS and writes it to the specified output File.

Parameters:

input - The LESS input File to compile.

output - The output File to write the CSS to.

force - 'false' to only compile the LESS input file in case the LESS source has been modified (including imports) or the output file does not exists.

Throws:

IOException - If the LESS file cannot be read or the output file cannot be written.

LessException

compile

public String compile(LessSource input)
               throws LessException

Compiles the input LessSource to CSS.

Parameters:

input - The input LessSource to compile.

Returns:

The CSS.

Throws:

LessException

compile

public void compile(LessSource input,
                    File output)
             throws IOException,
                    LessException

Compiles the input LessSource to CSS and writes it to the specified output File.

Parameters:

input - The input LessSource to compile.

output - The output File to write the CSS to.

Throws:

IOException - If the LESS file cannot be read or the output file cannot be written.

LessException

compile

public void compile(LessSource input,
                    File output,
                    boolean force)
             throws IOException,
                    LessException

Compiles the input LessSource to CSS and writes it to the specified output File.

Parameters:

input - The input LessSource to compile.

output - The output File to write the CSS to.

force - 'false' to only compile the input LessSource in case the LESS source has been modified (including imports) or the output file does not exists.

Throws:

IOException - If the LESS file cannot be read or the output file cannot be written.

LessException