michael@0: New option of Libhyphen 2.7: NOHYPHEN
michael@0: 
michael@0: Hyphen, apostrophe and other characters may be word boundary characters,
michael@0: but they don't need (extra) hyphenation. With NOHYPHEN option
michael@0: it's possible to hyphenate the words parts correctly.
michael@0: 
michael@0: Example:
michael@0: 
michael@0: ISO8859-1
michael@0: NOHYPHEN -,'
michael@0: 1-1
michael@0: 1'1
michael@0: NEXTLEVEL
michael@0: 
michael@0: Description:
michael@0: 
michael@0: 1-1 and 1'1 declare hyphen and apostrophe as word boundary characters
michael@0: and NOHYPHEN with the comma separated character (or character sequence)
michael@0: list forbid the (extra) hyphens at the hyphen and apostrophe characters.
michael@0: 
michael@0: Implicite NOHYPHEN declaration
michael@0: 
michael@0: Without explicite NEXTLEVEL declaration, Hyphen 2.8 uses the
michael@0: previous settings, plus in UTF-8 encoding, endash (U+2013) and
michael@0: typographical apostrophe (U+2019) are NOHYPHEN characters, too.
michael@0: 
michael@0: It's possible to enlarge the hyphenation distance from these
michael@0: NOHYPHEN characters by using COMPOUNDLEFTHYPHENMIN and
michael@0: COMPOUNDRIGHTHYPHENMIN attributes.
michael@0: 
michael@0: Compound word hyphenation
michael@0: 
michael@0: Hyphen library supports better compound word hyphenation and special
michael@0: rules of compound word hyphenation of German languages and other
michael@0: languages with arbitrary number of compound words. The new options,
michael@0: COMPOUNDLEFTHYPHENMIN and COMPOUNDRIGHTHYPHENMIN help to set the right
michael@0: style for the hyphenation of compound words.
michael@0: 
michael@0: Algorithm
michael@0: 
michael@0: The algorithm is an extension of the original pattern based hyphenation
michael@0: algorithm. It uses two hyphenation pattern sets, defined in the same
michael@0: pattern file and separated by the NEXTLEVEL keyword. First pattern
michael@0: set is for hyphenation only at compound word boundaries, the second one
michael@0: is for hyphenation within words or word parts.
michael@0: 
michael@0: Recursive compound level hyphenation
michael@0: 
michael@0: The algorithm is recursive: every word parts of a successful 
michael@0: first (compound) level hyphenation will be rehyphenated
michael@0: by the same (first) pattern set.
michael@0: 
michael@0: Finally, when first level hyphenation is not possible, Hyphen uses
michael@0: the second level hyphenation for the word or the word parts.
michael@0: 
michael@0: Word endings and word parts
michael@0: 
michael@0: Patterns for word endings (patterns with ellipses) match the
michael@0: word parts, too.
michael@0: 
michael@0: Options
michael@0: 
michael@0: COMPOUNDLEFTHYPHENMIN: min. hyph. dist. from the left compound word boundary
michael@0: COMPOUNDRIGHTHYPHENMIN: min. hyph. dist. from the right comp. word boundary
michael@0: NEXTLEVEL: sign second level hyphenation patterns
michael@0: 
michael@0: Default hyphenmin values
michael@0: 
michael@0: Default values of COMPOUNDLEFTHYPHENMIN and COMPOUNDRIGHTHYPHENMIN are 0,
michael@0: and 0 under the hyphenation, too. ("0" values of
michael@0: LEFTHYPHENMIN and RIGHTHYPHENMIN mean the default "2" under the hyphenation.)
michael@0: 
michael@0: Examples
michael@0: 
michael@0: See tests/compound* test files.
michael@0: 
michael@0: Preparation of hyphenation patterns
michael@0: 
michael@0: It hasn't been special pattern generator tool for compound hyphenation
michael@0: patterns, yet. It is possible to use PATGEN to generate both of
michael@0: pattern sets, concatenate it manually and set the requested HYPHENMIN values.
michael@0: (But don't forget the preprocessing steps by substrings.pl before
michael@0: concatenation.) One of the disadvantage of this method, that PATGEN
michael@0: doesn't know recursive compound hyphenation of Hyphen.
michael@0: 
michael@0: László Németh
michael@0: <nemeth (at) openoffice.org>