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## org.apache.fop.complexscripts.scripts
Class ScriptProcessor

    java.lang.Object
      org.apache.fop.complexscripts.scripts.ScriptProcessor

Direct Known Subclasses:
  DefaultScriptProcessor

    public abstract class ScriptProcessor

extends java.lang.Object

Abstract script processor base class for which an implementation of the substitution and positioning methods must be supplied.

This work was originally authored by Glenn Adams (gadams@apache.org).

Constructor Summary
`protected` | `ScriptProcessor(java.lang.String script)` Instantiate a script processor.

Method Summary
`GlyphTable.UseSpec[]` | `assembleLookups(GlyphTable table, java.lang.String[] features, java.util.Map lookups)` Assemble ordered array of lookup table use specifications according to the specified features and candidate lookups, where the order of the array is in accordance to the order of the applicable lookup list.
`static ScriptProcessor` | `getInstance(java.lang.String script)` Obtain script processor instance associated with specified script.
`java.lang.String[]` | `getOptionalPositioningFeatures()` Obtain script specific optional positioning features.
`java.lang.String[]` | `getOptionalSubstitutionFeatures()` Obtain script specific optional substitution features.
`abstract ScriptContextTester` | `getPositioningContextTester()` Obtain script specific positioning context tester.
`abstract java.lang.String[]` | `getPositioningFeatures()` Obtain script specific required positioning features.
`java.lang.String` | `getScript()`
`abstract ScriptContextTester` | `getSubstitutionContextTester()` Obtain script specific substitution context tester.
`abstract java.lang.String[]` | `getSubstitutionFeatures()` Obtain script specific required substitution features.
`boolean` | `position(GlyphPositioningTable gpos, GlyphSequence gs, java.lang.String script, java.lang.String language, int fontSize, java.util.Map lookups, int[] widths, int[][] adjustments)` Perform positioning processing using a specific set of lookup tables.
`boolean` | `position(GlyphSequence gs, java.lang.String script, java.lang.String language, int fontSize, GlyphTable.UseSpec[] usa, int[] widths, int[][] adjustments, ScriptContextTester sct)` Perform positioning processing using a specific set of ordered glyph table use specifications.
`GlyphSequence` | `reorderCombiningMarks(GlyphDefinitionTable gdef, GlyphSequence gs, int[] unscaledWidths, int[][] gpa, java.lang.String script, java.lang.String language)` Reorder combining marks in glyph sequence so that they precede (within the sequence) the base character to which they are applied.
`GlyphSequence` | `substitute(GlyphSequence gs, java.lang.String script, java.lang.String language, GlyphTable.UseSpec[] usa, ScriptContextTester sct)` Perform substitution processing using a specific set of ordered glyph table use specifications.
`GlyphSequence` | `substitute(GlyphSubstitutionTable gsub, GlyphSequence gs, java.lang.String script, java.lang.String language, java.util.Map lookups)` Perform substitution processing using a specific set of lookup tables.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### ScriptProcessor

    protected ScriptProcessor(java.lang.String script)

  Instantiate a script processor.

  Parameters:
    `script` - a script identifier

Method Detail

### getScript

    public final java.lang.String getScript()

  Returns:
    script identifier

### getSubstitutionFeatures

    public abstract java.lang.String[] getSubstitutionFeatures()

  Obtain script specific required substitution features.

  Returns:
    array of suppported substitution features or null

### getOptionalSubstitutionFeatures

    public java.lang.String[] getOptionalSubstitutionFeatures()

  Obtain script specific optional substitution features.

  Returns:
    array of suppported substitution features or null

### getSubstitutionContextTester

    public abstract ScriptContextTester getSubstitutionContextTester()

  Obtain script specific substitution context tester.

  Returns:
    substitution context tester or null

### substitute

    public final GlyphSequence substitute(GlyphSubstitutionTable gsub,
                                          GlyphSequence gs,
                                          java.lang.String script,
                                          java.lang.String language,
                                          java.util.Map lookups)

  Perform substitution processing using a specific set of lookup tables.

  Parameters:
    `gsub` - the glyph substitution table that applies
    `gs` - an input glyph sequence
    `script` - a script identifier
    `language` - a language identifier
    `lookups` - a mapping from lookup specifications to glyph subtables to use for substitution processing
  Returns:
    the substituted (output) glyph sequence

### substitute

    public GlyphSequence substitute(GlyphSequence gs,
                                    java.lang.String script,
                                    java.lang.String language,
                                    GlyphTable.UseSpec[] usa,
                                    ScriptContextTester sct)

  Perform substitution processing using a specific set of ordered glyph table use specifications.

  Parameters:
    `gs` - an input glyph sequence
    `script` - a script identifier
    `language` - a language identifier
    `usa` - an ordered array of glyph table use specs
    `sct` - a script specific context tester (or null)
  Returns:
    the substituted (output) glyph sequence

### reorderCombiningMarks

    public GlyphSequence reorderCombiningMarks(GlyphDefinitionTable gdef,
                                               GlyphSequence gs,
                                               int[] unscaledWidths,
                                               int[][] gpa,
                                               java.lang.String script,
                                               java.lang.String language)

  Reorder combining marks in glyph sequence so that they precede (within the sequence) the base character to which they are applied. N.B. In the case of RTL segments, marks are not reordered by this, method since when the segment is reversed by BIDI processing, marks are automatically reordered to precede their base glyph.

  Parameters:
    `gdef` - the glyph definition table that applies
    `gs` - an input glyph sequence
    `unscaledWidths` - associated unscaled advance widths (also reordered)
    `gpa` - associated glyph position adjustments (also reordered)
    `script` - a script identifier
    `language` - a language identifier
  Returns:
    the reordered (output) glyph sequence

### getPositioningFeatures

    public abstract java.lang.String[] getPositioningFeatures()

  Obtain script specific required positioning features.

  Returns:
    array of suppported positioning features or null

### getOptionalPositioningFeatures

    public java.lang.String[] getOptionalPositioningFeatures()

  Obtain script specific optional positioning features.

  Returns:
    array of suppported positioning features or null

### getPositioningContextTester

    public abstract ScriptContextTester getPositioningContextTester()

  Obtain script specific positioning context tester.

  Returns:
    positioning context tester or null

### position

    public final boolean position(GlyphPositioningTable gpos,
                                  GlyphSequence gs,
                                  java.lang.String script,
                                  java.lang.String language,
                                  int fontSize,
                                  java.util.Map lookups,
                                  int[] widths,
                                  int[][] adjustments)

  Perform positioning processing using a specific set of lookup tables.

  Parameters:
    `gpos` - the glyph positioning table that applies
    `gs` - an input glyph sequence
    `script` - a script identifier
    `language` - a language identifier
    `fontSize` - size in device units
    `lookups` - a mapping from lookup specifications to glyph subtables to use for positioning processing
    `widths` - array of default advancements for each glyph
    `adjustments` - accumulated adjustments array (sequence) of 4-tuples of placement [PX,PY] and advance [AX,AY] adjustments, in that order, with one 4-tuple for each element of glyph sequence
  Returns:
    true if some adjustment is not zero; otherwise, false

### position

    public boolean position(GlyphSequence gs,
                            java.lang.String script,
                            java.lang.String language,
                            int fontSize,
                            GlyphTable.UseSpec[] usa,
                            int[] widths,
                            int[][] adjustments,
                            ScriptContextTester sct)

  Perform positioning processing using a specific set of ordered glyph table use specifications.

  Parameters:
    `gs` - an input glyph sequence
    `script` - a script identifier
    `language` - a language identifier
    `fontSize` - size in device units
    `usa` - an ordered array of glyph table use specs
    `widths` - array of default advancements for each glyph in font
    `adjustments` - accumulated adjustments array (sequence) of 4-tuples of placement [PX,PY] and advance [AX,AY] adjustments, in that order, with one 4-tuple for each element of glyph sequence
    `sct` - a script specific context tester (or null)
  Returns:
    true if some adjustment is not zero; otherwise, false

### assembleLookups

    public final GlyphTable.UseSpec[] assembleLookups(GlyphTable table,
                                                      java.lang.String[] features,
                                                      java.util.Map lookups)

  Assemble ordered array of lookup table use specifications according to the specified features and candidate lookups, where the order of the array is in accordance to the order of the applicable lookup list.

  Parameters:
    `table` - the governing glyph table
    `features` - array of feature identifiers to apply
    `lookups` - a mapping from lookup specifications to lists of look tables from which to select lookup tables according to the specified features
  Returns:
    ordered array of assembled lookup table use specifications

### getInstance

    public static ScriptProcessor getInstance(java.lang.String script)

  Obtain script processor instance associated with specified script.

  Parameters:
    `script` - a script identifier
  Returns:
    a script processor instance or null if none found

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