Converts files from native encodings to ASCII with escaped Unicode. A common usage is to convert source files maintained in a native operating system encoding, to ASCII prior to compilation.

Files in the directory src are converted from a native encoding to ASCII. By default, all files in the directory are converted. However, conversion may be limited to selected files using includes and excludes attributes. For more information on file matching patterns, see the section on directory based tasks. If no encoding is specified, the default encoding for the JVM is used. If ext is specified, then output files are renamed to use it as a new extension. More sophisticated file name translations can be achieved using a nested <mapper> element. By default an identity mapper will be used. If dest and src point to the same directory, the ext attribute or a nested <mapper> is required.

This task forms an implicit File Set, and supports most attributes of <fileset> (dir becomes src) as well as nested <include>, <exclude>, and <patternset> elements.

It is possible to use different converters. This can be selected with the implementation attribute or a nested element. Here are the choices of the attribute:

Attribute Description Required
reverse Reverse the sense of the conversion, i.e. convert from ASCII to native only supported by the sun converter No
encoding The native encoding the files are in (default is the default encoding for the JVM) No
src The directory to find files in (default is basedir) No
dest The directory to output file to Yes
ext File extension to use in renaming output files No
defaultexcludes indicates whether default excludes should be used or not ("yes"/"no"). Default excludes are used when omitted. No
includes comma- or space-separated list of patterns of files that must be included. All files are included when omitted. No
includesfile the name of a file. Each line of this file is taken to be an include pattern No
excludes comma- or space-separated list of patterns of files that must be excluded. No files (except default excludes) are excluded when omitted. No
excludesfile the name of a file. Each line of this file is taken to be an exclude pattern No
implementation The converter implementation to use. If this attribute is not set, the default converter for the current VM will be used. (See the above list of valid converters.) No

Parameters specified as nested elements


You can specify additional command line arguments for the converter with nested <arg> elements. These elements are specified like Command-line Arguments but have an additional attribute that can be used to enable arguments only if a given converter implementation will be used.

Attribute Description Required
value See Command-line Arguments. Exactly one of these.
implementation Only pass the specified argument if the chosen converter implementation matches the value of this attribute. Legal values are the same as those in the above list of valid compilers.) No

implementationclasspath since Apache Ant 1.8.0

A PATH like structure holding the classpath to use when loading the converter implementation if a custom class has been specified. Doesn't have any effect when using one of the built-in converters.

Any nested element of a type that implements Native2AsciiAdapter since Ant 1.8.0

If a defined type implements the Native2AsciiAdapter interface a nested element of that type can be used as an alternative to the implementation attribute.


<native2ascii encoding="EUCJIS" src="srcdir" dest="srcdir"
   includes="**/*.eucjis" ext=".java"/>

Converts all files in the directory srcdir ending in .eucjis from the EUCJIS encoding to ASCII and renames them to end in .java.

<native2ascii encoding="EUCJIS" src="native/japanese" dest="src"

Converts all the files ending in .java in the directory native/japanese to ASCII, placing the results in the directory src. The names of the files remain the same.

If you want to use a custom Native2AsciiAdapter org.example.MyAdapter you can either use the implementation attribute:

<native2ascii encoding="EUCJIS" src="srcdir" dest="srcdir"
       includes="**/*.eucjis" ext=".java"

or a define a type and nest this into the task like in:

<componentdef classname="org.example.MyAdapter"
<native2ascii encoding="EUCJIS" src="srcdir" dest="srcdir"
       includes="**/*.eucjis" ext=".java">

in which case your native2ascii adapter can support attributes and nested elements of its own.