Filters

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Filters are the components that convert input documents from their native file format into a common internal set of resources that all Okapi components use. The extracted content can be re-written into the original file format. When using the steps, the extraction is done by the Raw Document to Filter Events Step and the re-writing by the Filter Events to Raw Document Step.

Note: The Okapi Filters Plugin for OmegaT allows you to use some of the filters directly from OmegaT.

List of the Filters

The framework distribution comes with the following filters:

Supported File Formats

The following is a list of some of the file formats supported by the distribution through pre-defined configurations:

Format Extensions Pre-Defined Configuration Filter
Android Strings .xml okf_xml-AndroidStrings XML Filter
CSV (Comma-separated values files) .csv, .txt okf_table_csv Table Filter
DITA .dita, .ditamap, .xml okf_xmlstream-dita XML Stream Filter
DokuWiki pages .txt okf_wiki Wiki Filter
Doxygen-commented files .c, .h, cpp okf_doxygen Doxygen Filter
DTD .dtd okf_dtd DTD Filter
Fixed-Width Columns Table .txt okf_table_fwc Table Filter
InCopy ICML .wcml okf_icml ICML Filter
InDesign IDML .idml okf_idml IDML Filter
iOS/Mac Strings .strings okf_regex-macStrings Regex Filter
Java Properties .properties okf_properties Properties Filter
Java Properties (Output not escaped) .properties okf_properties-outputNotEscaped Properties Filter
Java XML Properties .xml okf_xml-JavaProperties XML Filter
Java XML Properties (HTML strings) .xml okf_xmlstream-JavaPropertiesHTML XML Stream Filter
JSON .json okf_json JSON Filter
Haiku CatKeys .catkeys okf_table_catkeys Table Filter
HTML (any) .html, .htm okf_html HTML Filter
HTML (Well-formed, and XHTML) .html, .htm okf_html-wellFormed HTML Filter
HTML5 (and XHTML5) .html, .htm okf_itshtml5 HTML5-ITS Filter
Microsoft Excel 2007/2010 .xslx, .xltx, okf_openxml OpenXML Filter
Microsoft PowerPoint 2007/2010 .pptx, .potx okf_openxml OpenXML Filter
Microsoft Word 2007/2010 .docx, dotx okf_openxml OpenXML Filter
MIF .mif okf_mif MIF Filter
Moses Text .txt okf_mosestext Moses Text Filter
OpenOffice.org Calc .ods, .ots okf_openoffice OpenOffice Filter
OpenOffice.org Draw .odg, .otg okf_openoffice OpenOffice Filter
OpenOffice.org Impress .odp, .otp okf_openoffice OpenOffice Filter
OpenOffice.org Writer .odt, .ott okf_openoffice OpenOffice Filter
Pensieve TM .pentm okf_pensieve Pensieve TM Filter
PHP Content .php okf_phpcontent PHP Content Filter
Plain Text (Line = text unit) .txt okf_plaintext Plain Text Filter
Plain Text (Paragraph = text unit) .txt okf_plaintext_paragraphs Plain Text Filter
PO .po okf_po PO Filter
PO (Monolingual style) .po okf_po-monolingual PO Filter
Rainbow Translation Kit manifests .rkm okf_rainbowkit Rainbow Translation Kit Filter
RDF (Mozilla RDF) .rdf okf_xml-MozillaRDF XML Filter
RESX .resx okf_xml-resx XML Filter
SDLXLIFF .sdlxlf okf_xliff XLIFF Filter
Skype Language Files .lang okf_properties-skypeLang Properties Filter
SRT (Sub-Rip Text, sub-titles files) .srt okf_regex-srt Regex Filter
Tab-Delimiter files .tsv, .txt okf_table_tsv Table Filter
TMX .tmx okf_tmx TMX Filter
Transifex project .txp okf_transifex Transifex Filter
Trados-Tagged RTF .rtf okf_tradosrtf Trados-Tagged RTF Filter
TS - Qt TS files .ts okf_ts TS Filter
TTX - Trados TagEditor TTX files .ttx okf_ttx TTX Filter
TXML - Wordfast Pro TXML files .txml okf_txml TXML Filter
Versified Text .vrsz okf_versifiedtxt Versified Text Filter
Vignette Export/Import Content .xml okf_vignette Vignette Filter
XHTML .html, .htm okf_html-wellFormed HTML Filter
WIX (Windows Installer XML) localization files .wix okf_xml-WixLocalization XML Filter
XLIFF v1.2 .xlf, .xliff okf_xliff XLIFF Filter
XLIFF v2 .xlf okf_xliff2 XLIFF-2 Filter
XML (Generic, using ITS defaults) .xml okf_xml XML Filter
XML (Generic, using stream reader) .xml okf_xmlstream XML Stream Filter
YAML (Generic YAML filter) .yml, .yaml okf_yaml YAML Filter

Note that most filters allow you to create your own configurations to support more file formats.

Code Simplification Rules

All filters support code simplification rules. By default the Inline Codes Simplifier Step, Simplification Filter and Post-segmentation Inline Codes Removal Step maximize the trimming and merging (aka simplification) of inline codes. In some cases this may not be desired. The simplification rules allow you to override the default behavior and prevent specific codes from being trimmed or merged.

General Syntax

The rules parser ignores irrelevant whitespace. Rules can be separated by spaces, newlines or nothing. This makes it easier to accommodate various container formats and their whitespace normalization rules. When a rule applies it means "do not simplify the match code". Uppercase tokens are constants and predefined by the rule parser. Multiple rules are always OR'ed together.

For more details see the JavaCC grammar: ../okapi-core/src/main/java/net/sf/okapi/core/simplifierrules/SimplifierRules.jj

Rule Examples

If Code has any of these flags then don't simplify

if DELETABLE or ADDABLE or CLONEABLE;

"=" is string match Match basic TAGTYPE opening, closing or standalone

if DATA = "a" and TAGTYPE = OPENING;

"~" is regex match

if DATA ~ "a.*";

You can negate any of the match operators Don't simplify if the DATA does not match the regex

if DATA !~ "a.*";

Match on type, linebreak in this case, don't simplify

if the Code is a linebreak if TYPE = "lb";

Don't simplify any rich text types

if TYPE = "bold" or TYPE = "italic" or TYPE = "underline";

Expressions can be recursive (supports embedded parens)

if TYPE = "bold" or (DATA = "bar" or (DATA = "foo" and TYPE = "underline"));


Filter Config Examples

Examples of using simplifier rules within the filter config formats used by Okapi.

YAML:

simplifierRules: |
  if ADDABLE or DELETABLE or CLONEABLE;
  if DATA = "<br/>" or DATA = "<font>" or DATA = "</font>" or DATA = "</a>";
  if DATA ~ "\\<font.+" or DATA ~ "\\<img.+" or DATA ~ "\\<a.+";

ITS:

<?xml version="1.0" encoding="UTF-8"?>
<its:rules xmlns:its="http://www.w3.org/2005/11/its" version="1.0" xmlns:itsx="http://www.w3.org/2008/12/its-extensions" xmlns:okp="okapi-framework:xmlfilter-options">
<!-- See ITS specification at: http://www.w3.org/TR/its/ -->
 <its:translateRule selector="//*" translate="yes"/>
 <its:withinTextRule selector="//codeph" withinText="yes"/>
 <its:withinTextRule selector="//ph" withinText="yes"/>
 <okp:simplifierRules>
 if ADDABLE or DELETABLE or CLONEABLE; if DATA ~ ".+";
 </okp:simplifierRules>
</its:rules>

FPRM (Parameters):

#v1
extractNotes.b=true
simplifyCodes.b=true
simplifierRules=if ADDABLE or DELETABLE or CLONEABLE; if DATA ~ ".+";