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unicode.pl -- Unicode string handling
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This library is a wrapper around the utf8proc library, providing information about Unicode code-points and performing operations (mappings) on Unicode atoms. The central predicate is unicode_map/3, mapping a Unicode atom to another Unicode atom using a sequence of operations. The predicates unicode_nfd/2, unicode_nfc/2, unicode_nfkd/2 and unicode_nfkc/2 implement the four standard Unicode normalization forms.

Lump handling:

U+0020      <-- all space characters (general category Zs)
U+0027  '   <-- left/right single quotation mark U+2018..2019,
                modifier letter apostrophe U+02BC,
                modifier letter vertical line U+02C8
U+002D  -   <-- all dash characters (general category Pd),
                minus U+2212
U+002F  /   <-- fraction slash U+2044,
                division slash U+2215
U+003A  :   <-- ratio U+2236
U+003C  <   <-- single left-pointing angle quotation mark U+2039,
                left-pointing angle bracket U+2329,
                left angle bracket U+3008
U+003E  >   <-- single right-pointing angle quotation mark U+203A,
                right-pointing angle bracket U+232A,
                right angle bracket U+3009
U+005C  \   <-- set minus U+2216
U+005E  ^   <-- modifier letter up arrowhead U+02C4,
                modifier letter circumflex accent U+02C6,
                caret U+2038,
                up arrowhead U+2303
U+005F  _   <-- all connector characters (general category Pc),
                modifier letter low macron U+02CD
U+0060  `   <-- modifier letter grave accent U+02CB
U+007C  |   <-- divides U+2223
U+007E  ~   <-- tilde operator U+223C
See also
- http://www.public-software-group.org/utf8proc
Source unicode_map(+In, -Out, +Options) is det
Perform unicode normalization operations. Options is a list of operations. Defined operations are:
stable
Unicode Versioning Stability has to be respected.
compat
Compatiblity decomposition (i.e. formatting information is lost)
compose
Return a result with composed characters.
decompose
Return a result with decomposed characters.
ignore
Strip "default ignorable characters"
rejectna
Return an error, if the input contains unassigned code points.
nlf2ls
Indicating that NLF-sequences (LF, CRLF, CR, NEL) are representing a line break, and should be converted to the unicode character for line separation (LS).
nlf2ps
Indicating that NLF-sequences are representing a paragraph break, and should be converted to the unicode character for paragraph separation (PS).
nlf2lf
Indicating that the meaning of NLF-sequences is unknown.
stripcc
Strips and/or convers control characters. NLF-sequences are transformed into space, except if one of the NLF2LS/PS/LF options is given. HorizontalTab (HT) and FormFeed (FF) are treated as a NLF-sequence in this case. All other control characters are simply removed.
casefold
Performs unicode case folding, to be able to do a case-insensitive string comparison.
charbound
Inserts 0xFF bytes at the beginning of each sequence which is representing a single grapheme cluster (see UAX#29).
lump
(e.g. HYPHEN U+2010 and MINUS U+2212 to ASCII "-"). (See module header for details.) If NLF2LF is set, this includes a transformation of paragraph and line separators to ASCII line-feed (LF).
stripmark
Strips all character markings (non-spacing, spacing and enclosing) (i.e. accents) NOTE: this option works only with compose or decompose.
Source unicode_nfd(+In, -Out) is det
Characters are decomposed by canonical equivalence.
Source unicode_nfc(+In, -Out) is det
Characters are decomposed and then recomposed by canonical equivalence. It is possible for the result to be a different sequence of characters than the original.
See also
- http://en.wikipedia.org/wiki/Unicode_equivalence#Normal_forms
Source unicode_nfkd(+In, -Out) is det
Characters are decomposed by compatibility equivalence.
Source unicode_nfkc(+In, -Out) is det
Characters are decomposed by compatibility equivalence, then recomposed by canonical equivalence.
Source unicode_property(?Char, ?Property) is nondet
True if Property is defined for Char. Property is a term Name(Value). Defined property-names are:
category(atom)
Unicode code category of Char. This is one of Cc, Cf, Cn, Co, Cs, Ll, Lm, Lo, Lt, Lu, Mc, Me, Mn, Nd, Nl, No, Pc, Pd, Pe, Pf, Pi, Po, Ps, Sc, Sk, Sm, So, Zl, Zp, Zs. When testing, a single letter stands for all its subcategories. E.g. to test form a letter, you can use
unicode_property(C, category('L'))
combining_class(integer)
bidi_class(atom)
decomp_type(atom)
decomp_mapping(list(code))
bidi_mirrored(bool)
uppercase_mapping(code)
lowercase_mapping(code)
titlecase_mapping(code)
comb1st_index(code)
comb2nd_index(code)
comp_exclusion(bool)
ignorable(bool)
control_boundary(bool)
extend(bool)
casefold_mapping(list(code))
To be done
- Complete documentation