com.adobe.fontengine.font.cff

Class Type2Parser

java.lang.Object

com.adobe.fontengine.font.cff.Type2Parser

public final class Type2Parser
extends Object

Parse a Type2 charstring. A Type2Parser offers a single method, parse which is given a charstring and a Type2Consumer. As the charString is parsed, the Type2Consumer is called for each operator. The parser maintains the Type2 stack and storage area, interpreting the operators which affect them, as well as interpreting subroutine calls. The intent is that a Consumer can concentrate on dealing with the path and hints operators, and essentially ignore the arithmetic, storage, conditional and subroutine operators. However, all the operators are reported to the Consumer, so that it is for example possible to write a Consumer that creates an accurate textual representation of the charstring.

The same parser can be used repeatedly to parse multiple charstrings; those charstrings do not need to be in the same font, nor even in the same font set. The parser maintains no state between invocations of parse.

The consumer must not call parse on the parser that invoked it.

Synchronization

This class is not synchronized. The parse method invokes the Type2Consumer on the thread on which it is called.

Constructor Summary

Constructors

Constructor and Description
Type2Parser()

Method Summary

Modifier and Type	Method and Description
void	parse(CharStrings charStrings, int index, CharStrings localSubrs, CharStrings globalSubrs, Type2Consumer c, NameKeyedFont font) Decode a Type2 charstring.

Methods inherited from class java.lang.Object

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

Constructor Detail

Type2Parser

public Type2Parser()

Method Detail

parse

public void parse(CharStrings charStrings,
                  int index,
                  CharStrings localSubrs,
                  CharStrings globalSubrs,
                  Type2Consumer c,
                  NameKeyedFont font)
           throws InvalidGlyphException,
                  UnsupportedFontException

Decode a Type2 charstring.

Parameters:

charStrings - the CharStrings containing the charstring

index - the index of the charstring in charStrings

localSubrs - the local subroutines

globalSubrs - the global subroutines

c - the Type2Consumer to alert of the parsing events

font - The name-keyed font to which the charStrings belong, if they belong to a name-keyed font. If the font is cid-keyed, null should be passed in. font is only used to resolve seac glyphs, which can only be present in name-keyed fonts.

Throws:

InvalidGlyphException - the charstring is malformed or missing

UnsupportedFontException