FixCrLfFilter (Apache Ant API)
Date: 2016-08-23

org.apache.tools.ant.filters

## Class FixCrLfFilter

- java.lang.Object
- - java.io.Reader
  - - java.io.FilterReader
    - - org.apache.tools.ant.filters.BaseFilterReader
      - - org.apache.tools.ant.filters.BaseParamFilterReader
        - - org.apache.tools.ant.filters.FixCrLfFilter

- All Implemented Interfaces:
    java.io.Closeable, java.lang.AutoCloseable, java.lang.Readable, ChainableReader, Parameterizable

      public final class FixCrLfFilter
      extends BaseParamFilterReader
      implements ChainableReader

  Converts text to local OS formatting conventions, as well as repair text damaged by misconfigured or misguided editors or file transfer programs.

  This filter can take the following arguments:

  - eof
  - eol
  - fixlast
  - javafiles
  - tab
  - tablength
  None of which are required.

  This version generalises the handling of EOL characters, and allows for CR-only line endings (the standard on Mac systems prior to OS X). Tab handling has also been generalised to accommodate any tabwidth from 2 to 80, inclusive. Importantly, it can leave untouched any literal TAB characters embedded within Java string or character constants.

  Caution: run with care on carefully formatted files. This may sound obvious, but if you don't specify asis, presume that your files are going to be modified. If "tabs" is "add" or "remove", whitespace characters may be added or removed as necessary. Similarly, for EOLs, eol="asis" actually means convert to your native O/S EOL convention while eol="crlf" or cr="add" can result in CR characters being removed in one special case accommodated, i.e., CRCRLF is regarded as a single EOL to handle cases where other programs have converted CRLF into CRCRLF.

  Example:

       <<fixcrlf tab="add" eol="crlf" eof="asis"/>

  Or:

       <filterreader classname="org.apache.tools.ant.filters.FixCrLfFilter">
         <param eol="crlf" tab="asis"/>
        </filterreader>

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static class` | `FixCrLfFilter.AddAsisRemove` Enumerated attribute with the values "asis", "add" and "remove".
    `static class` | `FixCrLfFilter.CrLf` Enumerated attribute with the values "asis", "cr", "lf" and "crlf".

  - ### Field Summary

    - ### Fields inherited from class java.io.FilterReader

      `in`

    - ### Fields inherited from class java.io.Reader

      `lock`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `FixCrLfFilter()` Constructor for "dummy" instances.
    `FixCrLfFilter(java.io.Reader in)` Create a new filtered reader.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `java.io.Reader` | `chain(java.io.Reader rdr)` Create a new FixCrLfFilter using the passed in Reader for instantiation.
    `FixCrLfFilter.AddAsisRemove` | `getEof()` Get how DOS EOF (control-z) characters are being handled.
    `FixCrLfFilter.CrLf` | `getEol()` Get how EndOfLine characters are being handled.
    `boolean` | `getFixlast()` Get whether a missing EOL be added to the final line of the stream.
    `boolean` | `getJavafiles()` Get whether the stream is to be treated as though it contains Java source.
    `FixCrLfFilter.AddAsisRemove` | `getTab()` Return how tab characters are being handled.
    `int` | `getTablength()` Get the tab length to use.
    `int` | `read()` Return the next character in the filtered stream.
    `void` | `setEof(FixCrLfFilter.AddAsisRemove attr)` Specify how DOS EOF (control-z) characters are to be handled.
    `void` | `setEol(FixCrLfFilter.CrLf attr)` Specify how end of line (EOL) characters are to be handled.
    `void` | `setFixlast(boolean fixlast)` Specify whether a missing EOL will be added to the final line of input.
    `void` | `setJavafiles(boolean javafiles)` Indicate whether this stream contains Java source.
    `void` | `setTab(FixCrLfFilter.AddAsisRemove attr)` Specify how tab characters are to be handled.
    `void` | `setTablength(int tabLength)` Specify tab length in characters.

    - ### Methods inherited from class org.apache.tools.ant.filters.BaseParamFilterReader

      `getParameters, setParameters`

    - ### Methods inherited from class org.apache.tools.ant.filters.BaseFilterReader

      `getInitialized, getProject, read, readFully, readLine, setInitialized, setProject, skip`

    - ### Methods inherited from class java.io.FilterReader

      `close, mark, markSupported, ready, reset`

    - ### Methods inherited from class java.io.Reader

      `read, read`

    - ### Methods inherited from class java.lang.Object

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

- - ### Constructor Detail

    - #### FixCrLfFilter

          public FixCrLfFilter()

      Constructor for "dummy" instances.
      See Also:
        `BaseFilterReader.BaseFilterReader()`

    - #### FixCrLfFilter

          public FixCrLfFilter(java.io.Reader in)
                        throws java.io.IOException

      Create a new filtered reader.
      Parameters:
        `in` - A Reader object providing the underlying stream. Must not be `null`.
      Throws:
        `java.io.IOException` - on error.

  - ### Method Detail

    - #### chain

          public java.io.Reader chain(java.io.Reader rdr)

      Create a new FixCrLfFilter using the passed in Reader for instantiation.
      Specified by:
        `chain` in interface `ChainableReader`
      Parameters:
        `rdr` - A Reader object providing the underlying stream. Must not be `null`.
      Returns:
        a new filter based on this configuration, but filtering the specified reader.

    - #### getEof

          public FixCrLfFilter.AddAsisRemove getEof()

      Get how DOS EOF (control-z) characters are being handled.
      Returns:
        values:
        - add: ensure that there is an eof at the end of the file
        - asis: leave eof characters alone
        - remove: remove any eof character found at the end

    - #### getEol

          public FixCrLfFilter.CrLf getEol()

      Get how EndOfLine characters are being handled.
      Returns:
        values:
        - asis: convert line endings to your O/S convention
        - cr: convert line endings to CR
        - lf: convert line endings to LF
        - crlf: convert line endings to CRLF

    - #### getFixlast

          public boolean getFixlast()

      Get whether a missing EOL be added to the final line of the stream.
      Returns:
        true if a filtered file will always end with an EOL

    - #### getJavafiles

          public boolean getJavafiles()

      Get whether the stream is to be treated as though it contains Java source.

      This attribute is only used in association with the "tab" attribute. Tabs found in Java literals are protected from changes by this filter.

      Returns:
        true if whitespace in Java character and string literals is ignored.

    - #### getTab

          public FixCrLfFilter.AddAsisRemove getTab()

      Return how tab characters are being handled.
      Returns:
        values:
        - add: convert sequences of spaces which span a tab stop to tabs
        - asis: leave tab and space characters alone
        - remove: convert tabs to spaces

    - #### getTablength

          public int getTablength()

      Get the tab length to use.
      Returns:
        the length of tab in spaces

    - #### read

          public int read()
                   throws java.io.IOException

      Return the next character in the filtered stream.
      Overrides:
        `read` in class `java.io.FilterReader`
      Returns:
        the next character in the resulting stream, or -1 if the end of the resulting stream has been reached.
      Throws:
        `java.io.IOException` - if the underlying stream throws an IOException during reading.

    - #### setEof

          public void setEof(FixCrLfFilter.AddAsisRemove attr)

      Specify how DOS EOF (control-z) characters are to be handled.
      Parameters:
        `attr` - valid values:
        - add: ensure that there is an eof at the end of the file
        - asis: leave eof characters alone
        - remove: remove any eof character found at the end

    - #### setEol

          public void setEol(FixCrLfFilter.CrLf attr)

      Specify how end of line (EOL) characters are to be handled.
      Parameters:
        `attr` - valid values:
        - asis: convert line endings to your O/S convention
        - cr: convert line endings to CR
        - lf: convert line endings to LF
        - crlf: convert line endings to CRLF

    - #### setFixlast

          public void setFixlast(boolean fixlast)

      Specify whether a missing EOL will be added to the final line of input.
      Parameters:
        `fixlast` - if true a missing EOL will be appended.

    - #### setJavafiles

          public void setJavafiles(boolean javafiles)

      Indicate whether this stream contains Java source. This attribute is only used in association with the "tab" attribute.
      Parameters:
        `javafiles` - set to true to prevent this filter from changing tabs found in Java literals.

    - #### setTab

          public void setTab(FixCrLfFilter.AddAsisRemove attr)

      Specify how tab characters are to be handled.
      Parameters:
        `attr` - valid values:
        - add: convert sequences of spaces which span a tab stop to tabs
        - asis: leave tab and space characters alone
        - remove: convert tabs to spaces

    - #### setTablength

          public void setTablength(int tabLength)
                            throws java.io.IOException

      Specify tab length in characters.
      Parameters:
        `tabLength` - specify the length of tab in spaces. Valid values are between 2 and 80 inclusive. The default for this parameter is 8.
      Throws:
        `java.io.IOException` - on error.