216 lines
7.5 KiB
Lua
216 lines
7.5 KiB
Lua
-- -*- lua -*-
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-- there are four string-like ctype closures:
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-- unicode.ascii, latin1, utf8 and grapheme
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--
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-- ascii and latin1 are single-byte like string,
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-- but use the unicode table for upper/lower and character classes
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-- ascii does not touch bytes > 127 on upper/lower
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--
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-- ascii or latin1 can be used as locale-independent string replacement.
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-- (There is a compile switch to do this automatically for ascii).
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--
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-- UTF-8 operates on UTF-8 sequences as of RFC 3629:
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-- 1 byte 0-7F, 2 byte 80-7FF, 3 byte 800-FFFF, 4 byte 1000-10FFFF
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-- (not exclusing UTF-16 surrogate characters)
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-- Any byte not part of such a sequence is treated as it's (Latin-1) value.
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--
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-- Grapheme takes care of grapheme clusters, which are characters followed by
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-- "grapheme extension" characters (Mn+Me) like combining diacritical marks.
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--
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-- calls are:
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-- len(str)
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-- sub(str, start [,end=-1])
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-- byte(str, start [,end=-1])
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-- lower(str)
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-- upper(str)
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-- char(i [,j...])
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-- reverse(str)
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--
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-- same as in string: rep, format, dump
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-- TODO: use char count with %s in format? (sub does the job)
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-- TODO: grapheme.byte: only first code of any cluster?
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--
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-- find, gfind, gsub: done, but need thorough testing ...:
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-- ascii does not match them on any %class (but on ., literals and ranges)
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-- behaviour of %class with class not ASCII is undefined
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-- frontier %f currently disabled -- should we?
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--
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-- character classes are:
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-- %a L* (Lu+Ll+Lt+Lm+Lo)
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-- %c Cc
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-- %d 0-9
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-- %l Ll
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-- %n N* (Nd+Nl+No, new)
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-- %p P* (Pc+Pd+Ps+Pe+Pi+Pf+Po)
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-- %s Z* (Zs+Zl+Zp) plus the controls 9-13 (HT,LF,VT,FF,CR)
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-- %u Lu (also Lt ?)
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-- %w %a+%n+Pc (e.g. '_')
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-- %x 0-9A-Za-z
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-- %z the 0 byte
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-- c.f. http://unicode.org/Public/UNIDATA/UCD.html#General_Category_Values
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-- http://unicode.org/Public/UNIDATA/UnicodeData.txt
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--
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-- NOTE: find positions are in bytes for all ctypes!
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-- use ascii.sub to cut found ranges!
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-- this is a) faster b) more reliable
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--
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-- UTF-8 behaviour: match is by codes, code ranges are supported
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--
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-- grapheme behaviour: any %class, '.' and range match includes
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-- any following grapheme extensions.
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-- Ranges apply to single code points only.
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-- If a [] enumeration contains a grapheme cluster,
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-- this matches only the exact same cluster.
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-- However, a literal single 'o' standalone or in an [] enumeration
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-- will match just that 'o', even if it has a extension in the string.
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-- Consequently, grapheme match positions are not always cluster positions.
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--
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require("munit")
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local unicode = require("unicode")
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local utf8 = unicode.utf8
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unicode.string = string -- for tests unicode[ctype]
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local sprintf = string.format
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local function printf (fmt, ...) return print(sprintf(fmt, ...)) end
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local function check (test, ok, got)
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tassert(ok == got, "%s = %s GOT '%s'",test, ok, got or "<nil>")
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end
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local function checka (test, ok, ...)
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local arg = {...}
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arg[1] = arg[1] or ""
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return check(test, ok, table.concat(arg, ","))
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end
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local function testlen (str,bytes,codes,chars)
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codes = codes or bytes
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chars = chars or codes
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return check(sprintf("len '%s'", str),
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sprintf("%d/%d/%d", bytes, codes, chars),
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sprintf("%d/%d/%d", string.len(str), utf8.len(str), unicode.grapheme.len(str)))
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end
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-- 176 = 00B0;DEGREE SIGN -- UTF-8: C2,B0 = \194\176
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-- 196 = 00C4;LATIN CAPITAL LETTER A WITH DIAERESIS
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-- 214 = 00D6;LATIN CAPITAL LETTER O WITH DIAERESIS
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-- 776 = 0308;COMBINING DIAERESIS -- UTF-8: CC,88 = \204\136
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testlen("A\tB",3) -- plain Latin-1
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testlen("\176\196\214",3) -- plain Latin-1
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testlen("\196\176\214",3,2) -- C4,B0 is valid seq 0130 I WITH DOT ABOVE
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testlen("\192\178",2) -- C0,B2 is bad seq for 2
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testlen("°ÄÖ",6,3) -- simple Latin-1 chars in UTF-8
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testlen("\204\136A\204\136O\204\136",8,5,3) -- decomposed (with broken lead)
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local function testsub (ctype,ok,str,start,e)
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return check(sprintf("%s.sub('%s',%d,%d)", ctype, str, start, e), ok,
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unicode[ctype].sub(str,start,e))
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end
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testsub("ascii","BCD","ABCDE",2,4)
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testsub("utf8","BCD","ABCDE",2,4)
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testsub("latin1","Ä","°ÄÖ",3,4)
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testsub("utf8","Ä","°ÄÖ",2,2)
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testsub("utf8","ÄÖ","°ÄÖ",2,-1)
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testsub("utf8","\204\136","A\204\136O\204\136",2,2) -- decomposed
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testsub("grapheme","O\204\136","A\204\136O\204\136",2,2) -- decomposed
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local function testbyte (ctype, ok, str, ...)
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return checka(sprintf("%s.byte('%s',%s)",ctype,str,table.concat({...}, ",")),
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ok, unicode[ctype].byte(str, ...))
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end
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testbyte("string","194,176","Ä°Ö",3,4) -- the UTF-8 seq for °
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testbyte("ascii","194,176","Ä°Ö",3,4)
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testbyte("utf8","176,214","Ä°Ö",2,3) -- code points for °,Ö
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testbyte("utf8","65,776","\204\136A\204\136O\204\136",2,3) -- decomposed
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testbyte("grapheme","65,776","\204\136A\204\136O\204\136",2) -- decomposed
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local function testchar (ctype, ok, ...)
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return check(sprintf("%s.char(%s)",ctype,table.concat({...}, ",")),
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ok, unicode[ctype].char(...))
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end
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testchar("ascii", "AB", 65,66)
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testchar("ascii", "\176", 176)
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testchar("utf8", "\194\176", 176)
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local function testcase (ctype,str,up,lo)
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check(sprintf("%s.lower('%s')", ctype, str), lo, unicode[ctype].lower(str))
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check(sprintf("%s.upper('%s')", ctype, str), up, unicode[ctype].upper(str))
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end
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-- upper/lower also fixes plain Latin
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testcase("utf8","Ab\196üo\204\136","ABÄÜO\204\136","abäüo\204\136")
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testcase("ascii","Ab\196üo\204\136","AB\196üO\204\136","ab\196üo\204\136")
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testcase("latin1","Ab\196","AB\196","ab\228")
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local function testrev (ctype,ok,str)
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return check(sprintf("%s.reverse('%s')",ctype,str),
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ok, unicode[ctype].reverse(str))
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end
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testrev("ascii","b\136\204oa\176\194ba","ab°ao\204\136b");
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testrev("utf8","b\204\136oa°ba","ab°ao\204\136b");
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testrev("grapheme","bo\204\136a°ba","ab°ao\204\136b");
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local function testfind (ctype,ok,str,pat)
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return checka(sprintf("%s.find('%s','%s')",ctype,str,pat),
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ok, unicode[ctype].find(str, pat))
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end
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testfind("ascii","1,1","e=mc2","%a")
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testfind("ascii","3,4","e=mc2","%a%a")
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testfind("ascii","5,5","e=mc2","%d")
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testfind("ascii","","Ä","%a")
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testfind("ascii","1,2","Ä","%A*")
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testfind("latin1","1,1","Ä","%a")
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testfind("utf8","1,2","Ä","%a")
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testfind("utf8","1,1","o\204\136","%a*")
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testfind("utf8","2,3","o\204\136","%A")
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testfind("utf8","1,1","o\204\136",".")
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testfind("grapheme","1,3","o\204\136","%a*")
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testfind("grapheme","2,3","o\204\136","%A") -- didn't expect this?
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testfind("grapheme","1,3","o\204\136",".")
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testfind("utf8","4,5","ÜHÄPPY","[À-Ö]")
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testfind("utf8","4,5","ÜHÄPPY","[Ä-]")
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testfind("utf8","7,7","ÜHÄP-PY","[ä-]")
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testfind("ascii","1,4","abcdef","%a*d")
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testfind("utf8","1,10","äöüßü","%a*ü")
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testfind("utf8","1,6","äöüß","%a*ü")
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testfind("utf8","4,5,Ä","ÜHÄPPY","([À-Ö])")
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testfind("utf8","1,5,ÜHÄ","ÜHÄ_PPY","([%w]+)")
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testfind("utf8","1,9,ÜHÄ_PPY","ÜHÄ_PPY","([%w_]+)")
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local function testgsub (ctype,ok,str,pat,repl)
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return check(sprintf("%s.gsub('%s','%s','%s')",ctype,str,pat,repl),
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ok, unicode[ctype].gsub(str,pat,repl))
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end
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testgsub("ascii","hello hello world world","hello world", "(%w+)", "%1 %1")
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testgsub("ascii","world hello Lua from",
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"hello world from Lua", "(%w+)%s*(%w+)", "%2 %1")
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testgsub("ascii","l helö wöfr rldöL müä",
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"hellö wörld fröm Lüä", "(%w+)%s*(%w+)", "%2 %1")
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testgsub("utf8","wörld hellö Lüä fröm",
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"hellö wörld fröm Lüä", "(%w+)%s*(%w+)", "%2 %1")
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testgsub("utf8","HÜppÄ","HÄppÜ","([À-Ö])(%l*)(%u)","%3%2%1")
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fail = 0
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for i=0,65535 do if i ~= utf8.byte(utf8.char(i)) then fail=fail+1 end end
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check("code-decode failures", 0, fail)
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--[[ print the table
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for i=192,65535,64 do
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local k = i/64
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io.write(sprintf("%04x\\%3d\\%3d ",i, 224+k/64, 128+math.mod(k,64)))
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for j=i,i+63 do
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io.write(utf8.char(j))
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end
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io.write("\n")
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end
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]]
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