+++ /dev/null
--- $Id: utf8.lua 179 2009-04-03 18:10:03Z pasta $
---
--- Provides UTF-8 aware string functions implemented in pure lua:
--- * utf8len(s)
--- * utf8sub(s, i, j)
--- * utf8reverse(s)
--- * utf8char(unicode)
--- * utf8unicode(s, i, j)
--- * utf8gensub(s, sub_len)
--- * utf8find(str, regex, init, plain)
--- * utf8match(str, regex, init)
--- * utf8gmatch(str, regex, all)
--- * utf8gsub(str, regex, repl, limit)
---
--- If utf8data.lua (containing the lower<->upper case mappings) is loaded, these
--- additional functions are available:
--- * utf8upper(s)
--- * utf8lower(s)
---
--- All functions behave as their non UTF-8 aware counterparts with the exception
--- that UTF-8 characters are used instead of bytes for all units.
-
---[[
-Copyright (c) 2006-2007, Kyle Smith
-All rights reserved.
-
-Contributors:
- Alimov Stepan
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are met:
-
- * Redistributions of source code must retain the above copyright notice,
- this list of conditions and the following disclaimer.
- * Redistributions in binary form must reproduce the above copyright
- notice, this list of conditions and the following disclaimer in the
- documentation and/or other materials provided with the distribution.
- * Neither the name of the author nor the names of its contributors may be
- used to endorse or promote products derived from this software without
- specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
-FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
-OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
---]]
-
--- ABNF from RFC 3629
---
--- UTF8-octets = *( UTF8-char )
--- UTF8-char = UTF8-1 / UTF8-2 / UTF8-3 / UTF8-4
--- UTF8-1 = %x00-7F
--- UTF8-2 = %xC2-DF UTF8-tail
--- UTF8-3 = %xE0 %xA0-BF UTF8-tail / %xE1-EC 2( UTF8-tail ) /
--- %xED %x80-9F UTF8-tail / %xEE-EF 2( UTF8-tail )
--- UTF8-4 = %xF0 %x90-BF 2( UTF8-tail ) / %xF1-F3 3( UTF8-tail ) /
--- %xF4 %x80-8F 2( UTF8-tail )
--- UTF8-tail = %x80-BF
---
-
-local byte = string.byte
-local char = string.char
-local dump = string.dump
-local find = string.find
-local format = string.format
-local gmatch = string.gmatch
-local gsub = string.gsub
-local len = string.len
-local lower = string.lower
-local match = string.match
-local rep = string.rep
-local reverse = string.reverse
-local sub = string.sub
-local upper = string.upper
-
--- returns the number of bytes used by the UTF-8 character at byte i in s
--- also doubles as a UTF-8 character validator
-local function utf8charbytes (s, i)
- -- argument defaults
- i = i or 1
-
- -- argument checking
- if type(s) ~= "string" then
- error("bad argument #1 to 'utf8charbytes' (string expected, got ".. type(s).. ")")
- end
- if type(i) ~= "number" then
- error("bad argument #2 to 'utf8charbytes' (number expected, got ".. type(i).. ")")
- end
-
- local c = byte(s, i)
-
- -- determine bytes needed for character, based on RFC 3629
- -- validate byte 1
- if c > 0 and c <= 127 then
- -- UTF8-1
- return 1
-
- elseif c >= 194 and c <= 223 then
- -- UTF8-2
- local c2 = byte(s, i + 1)
-
- if not c2 then
- error("UTF-8 string terminated early")
- end
-
- -- validate byte 2
- if c2 < 128 or c2 > 191 then
- error("Invalid UTF-8 character")
- end
-
- return 2
-
- elseif c >= 224 and c <= 239 then
- -- UTF8-3
- local c2 = byte(s, i + 1)
- local c3 = byte(s, i + 2)
-
- if not c2 or not c3 then
- error("UTF-8 string terminated early")
- end
-
- -- validate byte 2
- if c == 224 and (c2 < 160 or c2 > 191) then
- error("Invalid UTF-8 character")
- elseif c == 237 and (c2 < 128 or c2 > 159) then
- error("Invalid UTF-8 character")
- elseif c2 < 128 or c2 > 191 then
- error("Invalid UTF-8 character")
- end
-
- -- validate byte 3
- if c3 < 128 or c3 > 191 then
- error("Invalid UTF-8 character")
- end
-
- return 3
-
- elseif c >= 240 and c <= 244 then
- -- UTF8-4
- local c2 = byte(s, i + 1)
- local c3 = byte(s, i + 2)
- local c4 = byte(s, i + 3)
-
- if not c2 or not c3 or not c4 then
- error("UTF-8 string terminated early")
- end
-
- -- validate byte 2
- if c == 240 and (c2 < 144 or c2 > 191) then
- error("Invalid UTF-8 character")
- elseif c == 244 and (c2 < 128 or c2 > 143) then
- error("Invalid UTF-8 character")
- elseif c2 < 128 or c2 > 191 then
- error("Invalid UTF-8 character")
- end
-
- -- validate byte 3
- if c3 < 128 or c3 > 191 then
- error("Invalid UTF-8 character")
- end
-
- -- validate byte 4
- if c4 < 128 or c4 > 191 then
- error("Invalid UTF-8 character")
- end
-
- return 4
-
- else
- error("Invalid UTF-8 character")
- end
-end
-
--- returns the number of characters in a UTF-8 string
-local function utf8len (s)
- -- argument checking
- if type(s) ~= "string" then
- for k,v in pairs(s) do print('"',tostring(k),'"',tostring(v),'"') end
- error("bad argument #1 to 'utf8len' (string expected, got ".. type(s).. ")")
- end
-
- local pos = 1
- local bytes = len(s)
- local len = 0
-
- while pos <= bytes do
- len = len + 1
- pos = pos + utf8charbytes(s, pos)
- end
-
- return len
-end
-
--- functions identically to string.sub except that i and j are UTF-8 characters
--- instead of bytes
-local function utf8sub (s, i, j)
- -- argument defaults
- j = j or -1
-
- local pos = 1
- local bytes = len(s)
- local len = 0
-
- -- only set l if i or j is negative
- local l = (i >= 0 and j >= 0) or utf8len(s)
- local startChar = (i >= 0) and i or l + i + 1
- local endChar = (j >= 0) and j or l + j + 1
-
- -- can't have start before end!
- if startChar > endChar then
- return ""
- end
-
- -- byte offsets to pass to string.sub
- local startByte,endByte = 1,bytes
-
- while pos <= bytes do
- len = len + 1
-
- if len == startChar then
- startByte = pos
- end
-
- pos = pos + utf8charbytes(s, pos)
-
- if len == endChar then
- endByte = pos - 1
- break
- end
- end
-
- if startChar > len then startByte = bytes+1 end
- if endChar < 1 then endByte = 0 end
-
- return sub(s, startByte, endByte)
-end
-
-
--- replace UTF-8 characters based on a mapping table
-local function utf8replace (s, mapping)
- -- argument checking
- if type(s) ~= "string" then
- error("bad argument #1 to 'utf8replace' (string expected, got ".. type(s).. ")")
- end
- if type(mapping) ~= "table" then
- error("bad argument #2 to 'utf8replace' (table expected, got ".. type(mapping).. ")")
- end
-
- local pos = 1
- local bytes = len(s)
- local charbytes
- local newstr = ""
-
- while pos <= bytes do
- charbytes = utf8charbytes(s, pos)
- local c = sub(s, pos, pos + charbytes - 1)
-
- newstr = newstr .. (mapping[c] or c)
-
- pos = pos + charbytes
- end
-
- return newstr
-end
-
-
--- identical to string.upper except it knows about unicode simple case conversions
-local function utf8upper (s)
- return utf8replace(s, utf8_lc_uc)
-end
-
--- identical to string.lower except it knows about unicode simple case conversions
-local function utf8lower (s)
- return utf8replace(s, utf8_uc_lc)
-end
-
--- identical to string.reverse except that it supports UTF-8
-local function utf8reverse (s)
- -- argument checking
- if type(s) ~= "string" then
- error("bad argument #1 to 'utf8reverse' (string expected, got ".. type(s).. ")")
- end
-
- local bytes = len(s)
- local pos = bytes
- local charbytes
- local newstr = ""
-
- while pos > 0 do
- c = byte(s, pos)
- while c >= 128 and c <= 191 do
- pos = pos - 1
- c = byte(s, pos)
- end
-
- charbytes = utf8charbytes(s, pos)
-
- newstr = newstr .. sub(s, pos, pos + charbytes - 1)
-
- pos = pos - 1
- end
-
- return newstr
-end
-
--- http://en.wikipedia.org/wiki/Utf8
--- http://developer.coronalabs.com/code/utf-8-conversion-utility
-local function utf8char(unicode)
- if unicode <= 0x7F then return char(unicode) end
-
- if (unicode <= 0x7FF) then
- local Byte0 = 0xC0 + math.floor(unicode / 0x40);
- local Byte1 = 0x80 + (unicode % 0x40);
- return char(Byte0, Byte1);
- end;
-
- if (unicode <= 0xFFFF) then
- local Byte0 = 0xE0 + math.floor(unicode / 0x1000);
- local Byte1 = 0x80 + (math.floor(unicode / 0x40) % 0x40);
- local Byte2 = 0x80 + (unicode % 0x40);
- return char(Byte0, Byte1, Byte2);
- end;
-
- if (unicode <= 0x10FFFF) then
- local code = unicode
- local Byte3= 0x80 + (code % 0x40);
- code = math.floor(code / 0x40)
- local Byte2= 0x80 + (code % 0x40);
- code = math.floor(code / 0x40)
- local Byte1= 0x80 + (code % 0x40);
- code = math.floor(code / 0x40)
- local Byte0= 0xF0 + code;
-
- return char(Byte0, Byte1, Byte2, Byte3);
- end;
-
- error 'Unicode cannot be greater than U+10FFFF!'
-end
-
-local shift_6 = 2^6
-local shift_12 = 2^12
-local shift_18 = 2^18
-
-local utf8unicode
-utf8unicode = function(str, i, j, byte_pos)
- i = i or 1
- j = j or i
-
- if i > j then return end
-
- local char,bytes
-
- if byte_pos then
- bytes = utf8charbytes(str,byte_pos)
- char = sub(str,byte_pos,byte_pos-1+bytes)
- else
- char,byte_pos = utf8sub(str,i,i), 0
- bytes = #char
- end
-
- local unicode
-
- if bytes == 1 then unicode = byte(char) end
- if bytes == 2 then
- local byte0,byte1 = byte(char,1,2)
- local code0,code1 = byte0-0xC0,byte1-0x80
- unicode = code0*shift_6 + code1
- end
- if bytes == 3 then
- local byte0,byte1,byte2 = byte(char,1,3)
- local code0,code1,code2 = byte0-0xE0,byte1-0x80,byte2-0x80
- unicode = code0*shift_12 + code1*shift_6 + code2
- end
- if bytes == 4 then
- local byte0,byte1,byte2,byte3 = byte(char,1,4)
- local code0,code1,code2,code3 = byte0-0xF0,byte1-0x80,byte2-0x80,byte3-0x80
- unicode = code0*shift_18 + code1*shift_12 + code2*shift_6 + code3
- end
-
- return unicode,utf8unicode(str, i+1, j, byte_pos+bytes)
-end
-
--- Returns an iterator which returns the next substring and its byte interval
-local function utf8gensub(str, sub_len)
- sub_len = sub_len or 1
- local byte_pos = 1
- local len = #str
- return function(skip)
- if skip then byte_pos = byte_pos + skip end
- local char_count = 0
- local start = byte_pos
- repeat
- if byte_pos > len then return end
- char_count = char_count + 1
- local bytes = utf8charbytes(str,byte_pos)
- byte_pos = byte_pos+bytes
-
- until char_count == sub_len
-
- local last = byte_pos-1
- local sub = sub(str,start,last)
- return sub, start, last
- end
-end
-
-local function binsearch(sortedTable, item, comp)
- local head, tail = 1, #sortedTable
- local mid = math.floor((head + tail)/2)
- if not comp then
- while (tail - head) > 1 do
- if sortedTable[tonumber(mid)] > item then
- tail = mid
- else
- head = mid
- end
- mid = math.floor((head + tail)/2)
- end
- else
- end
- if sortedTable[tonumber(head)] == item then
- return true, tonumber(head)
- elseif sortedTable[tonumber(tail)] == item then
- return true, tonumber(tail)
- else
- return false
- end
-end
-local function classMatchGenerator(class, plain)
- local codes = {}
- local ranges = {}
- local ignore = false
- local range = false
- local firstletter = true
- local unmatch = false
-
- local it = utf8gensub(class)
-
- local skip
- for c,bs,be in it do
- skip = be
- if not ignore and not plain then
- if c == "%" then
- ignore = true
- elseif c == "-" then
- table.insert(codes, utf8unicode(c))
- range = true
- elseif c == "^" then
- if not firstletter then
- error('!!!')
- else
- unmatch = true
- end
- elseif c == ']' then
- break
- else
- if not range then
- table.insert(codes, utf8unicode(c))
- else
- table.remove(codes) -- removing '-'
- table.insert(ranges, {table.remove(codes), utf8unicode(c)})
- range = false
- end
- end
- elseif ignore and not plain then
- if c == 'a' then -- %a: represents all letters. (ONLY ASCII)
- table.insert(ranges, {65, 90}) -- A - Z
- table.insert(ranges, {97, 122}) -- a - z
- elseif c == 'c' then -- %c: represents all control characters.
- table.insert(ranges, {0, 31})
- table.insert(codes, 127)
- elseif c == 'd' then -- %d: represents all digits.
- table.insert(ranges, {48, 57}) -- 0 - 9
- elseif c == 'g' then -- %g: represents all printable characters except space.
- table.insert(ranges, {1, 8})
- table.insert(ranges, {14, 31})
- table.insert(ranges, {33, 132})
- table.insert(ranges, {134, 159})
- table.insert(ranges, {161, 5759})
- table.insert(ranges, {5761, 8191})
- table.insert(ranges, {8203, 8231})
- table.insert(ranges, {8234, 8238})
- table.insert(ranges, {8240, 8286})
- table.insert(ranges, {8288, 12287})
- elseif c == 'l' then -- %l: represents all lowercase letters. (ONLY ASCII)
- table.insert(ranges, {97, 122}) -- a - z
- elseif c == 'p' then -- %p: represents all punctuation characters. (ONLY ASCII)
- table.insert(ranges, {33, 47})
- table.insert(ranges, {58, 64})
- table.insert(ranges, {91, 96})
- table.insert(ranges, {123, 126})
- elseif c == 's' then -- %s: represents all space characters.
- table.insert(ranges, {9, 13})
- table.insert(codes, 32)
- table.insert(codes, 133)
- table.insert(codes, 160)
- table.insert(codes, 5760)
- table.insert(ranges, {8192, 8202})
- table.insert(codes, 8232)
- table.insert(codes, 8233)
- table.insert(codes, 8239)
- table.insert(codes, 8287)
- table.insert(codes, 12288)
- elseif c == 'u' then -- %u: represents all uppercase letters. (ONLY ASCII)
- table.insert(ranges, {65, 90}) -- A - Z
- elseif c == 'w' then -- %w: represents all alphanumeric characters. (ONLY ASCII)
- table.insert(ranges, {48, 57}) -- 0 - 9
- table.insert(ranges, {65, 90}) -- A - Z
- table.insert(ranges, {97, 122}) -- a - z
- elseif c == 'x' then -- %x: represents all hexadecimal digits.
- table.insert(ranges, {48, 57}) -- 0 - 9
- table.insert(ranges, {65, 70}) -- A - F
- table.insert(ranges, {97, 102}) -- a - f
- else
- if not range then
- table.insert(codes, utf8unicode(c))
- else
- table.remove(codes) -- removing '-'
- table.insert(ranges, {table.remove(codes), utf8unicode(c)})
- range = false
- end
- end
- ignore = false
- else
- if not range then
- table.insert(codes, utf8unicode(c))
- else
- table.remove(codes) -- removing '-'
- table.insert(ranges, {table.remove(codes), utf8unicode(c)})
- range = false
- end
- ignore = false
- end
-
- firstletter = false
- end
-
- table.sort(codes)
-
- local function inRanges(charCode)
- for _,r in ipairs(ranges) do
- if r[1] <= charCode and charCode <= r[2] then
- return true
- end
- end
- return false
- end
- if not unmatch then
- return function(charCode)
- return binsearch(codes, charCode) or inRanges(charCode)
- end, skip
- else
- return function(charCode)
- return charCode ~= -1 and not (binsearch(codes, charCode) or inRanges(charCode))
- end, skip
- end
-end
-
--- utf8sub with extra argument, and extra result value
-local function utf8subWithBytes (s, i, j, sb)
- -- argument defaults
- j = j or -1
-
- local pos = sb or 1
- local bytes = len(s)
- local len = 0
-
- -- only set l if i or j is negative
- local l = (i >= 0 and j >= 0) or utf8len(s)
- local startChar = (i >= 0) and i or l + i + 1
- local endChar = (j >= 0) and j or l + j + 1
-
- -- can't have start before end!
- if startChar > endChar then
- return ""
- end
-
- -- byte offsets to pass to string.sub
- local startByte,endByte = 1,bytes
-
- while pos <= bytes do
- len = len + 1
-
- if len == startChar then
- startByte = pos
- end
-
- pos = pos + utf8charbytes(s, pos)
-
- if len == endChar then
- endByte = pos - 1
- break
- end
- end
-
- if startChar > len then startByte = bytes+1 end
- if endChar < 1 then endByte = 0 end
-
- return sub(s, startByte, endByte), endByte + 1
-end
-
-local cache = setmetatable({},{
- __mode = 'kv'
-})
-local cachePlain = setmetatable({},{
- __mode = 'kv'
-})
-local function matcherGenerator(regex, plain)
- local matcher = {
- functions = {},
- captures = {}
- }
- if not plain then
- cache[regex] = matcher
- else
- cachePlain[regex] = matcher
- end
- local function simple(func)
- return function(cC)
- if func(cC) then
- matcher:nextFunc()
- matcher:nextStr()
- else
- matcher:reset()
- end
- end
- end
- local function star(func)
- return function(cC)
- if func(cC) then
- matcher:fullResetOnNextFunc()
- matcher:nextStr()
- else
- matcher:nextFunc()
- end
- end
- end
- local function minus(func)
- return function(cC)
- if func(cC) then
- matcher:fullResetOnNextStr()
- end
- matcher:nextFunc()
- end
- end
- local function question(func)
- return function(cC)
- if func(cC) then
- matcher:fullResetOnNextFunc()
- matcher:nextStr()
- end
- matcher:nextFunc()
- end
- end
-
- local function capture(id)
- return function(cC)
- local l = matcher.captures[id][2] - matcher.captures[id][1]
- local captured = utf8sub(matcher.string, matcher.captures[id][1], matcher.captures[id][2])
- local check = utf8sub(matcher.string, matcher.str, matcher.str + l)
- if captured == check then
- for i = 0, l do
- matcher:nextStr()
- end
- matcher:nextFunc()
- else
- matcher:reset()
- end
- end
- end
- local function captureStart(id)
- return function(cC)
- matcher.captures[id][1] = matcher.str
- matcher:nextFunc()
- end
- end
- local function captureStop(id)
- return function(cC)
- matcher.captures[id][2] = matcher.str - 1
- matcher:nextFunc()
- end
- end
-
- local function balancer(str)
- local sum = 0
- local bc, ec = utf8sub(str, 1, 1), utf8sub(str, 2, 2)
- local skip = len(bc) + len(ec)
- bc, ec = utf8unicode(bc), utf8unicode(ec)
- return function(cC)
- if cC == ec and sum > 0 then
- sum = sum - 1
- if sum == 0 then
- matcher:nextFunc()
- end
- matcher:nextStr()
- elseif cC == bc then
- sum = sum + 1
- matcher:nextStr()
- else
- if sum == 0 or cC == -1 then
- sum = 0
- matcher:reset()
- else
- matcher:nextStr()
- end
- end
- end, skip
- end
-
- matcher.functions[1] = function(cC)
- matcher:fullResetOnNextStr()
- matcher.seqStart = matcher.str
- matcher:nextFunc()
- if (matcher.str > matcher.startStr and matcher.fromStart) or matcher.str >= matcher.stringLen then
- matcher.stop = true
- matcher.seqStart = nil
- end
- end
-
- local lastFunc
- local ignore = false
- local skip = nil
- local it = (function()
- local gen = utf8gensub(regex)
- return function()
- return gen(skip)
- end
- end)()
- local cs = {}
- for c, bs, be in it do
- skip = nil
- if plain then
- table.insert(matcher.functions, simple(classMatchGenerator(c, plain)))
- else
- if ignore then
- if find('123456789', c, 1, true) then
- if lastFunc then
- table.insert(matcher.functions, simple(lastFunc))
- lastFunc = nil
- end
- table.insert(matcher.functions, capture(tonumber(c)))
- elseif c == 'b' then
- if lastFunc then
- table.insert(matcher.functions, simple(lastFunc))
- lastFunc = nil
- end
- local b
- b, skip = balancer(sub(regex, be + 1, be + 9))
- table.insert(matcher.functions, b)
- else
- lastFunc = classMatchGenerator('%' .. c)
- end
- ignore = false
- else
- if c == '*' then
- if lastFunc then
- table.insert(matcher.functions, star(lastFunc))
- lastFunc = nil
- else
- error('invalid regex after ' .. sub(regex, 1, bs))
- end
- elseif c == '+' then
- if lastFunc then
- table.insert(matcher.functions, simple(lastFunc))
- table.insert(matcher.functions, star(lastFunc))
- lastFunc = nil
- else
- error('invalid regex after ' .. sub(regex, 1, bs))
- end
- elseif c == '-' then
- if lastFunc then
- table.insert(matcher.functions, minus(lastFunc))
- lastFunc = nil
- else
- error('invalid regex after ' .. sub(regex, 1, bs))
- end
- elseif c == '?' then
- if lastFunc then
- table.insert(matcher.functions, question(lastFunc))
- lastFunc = nil
- else
- error('invalid regex after ' .. sub(regex, 1, bs))
- end
- elseif c == '^' then
- if bs == 1 then
- matcher.fromStart = true
- else
- error('invalid regex after ' .. sub(regex, 1, bs))
- end
- elseif c == '$' then
- if be == len(regex) then
- matcher.toEnd = true
- else
- error('invalid regex after ' .. sub(regex, 1, bs))
- end
- elseif c == '[' then
- if lastFunc then
- table.insert(matcher.functions, simple(lastFunc))
- end
- lastFunc, skip = classMatchGenerator(sub(regex, be + 1))
- elseif c == '(' then
- if lastFunc then
- table.insert(matcher.functions, simple(lastFunc))
- lastFunc = nil
- end
- table.insert(matcher.captures, {})
- table.insert(cs, #matcher.captures)
- table.insert(matcher.functions, captureStart(cs[#cs]))
- if sub(regex, be + 1, be + 1) == ')' then matcher.captures[#matcher.captures].empty = true end
- elseif c == ')' then
- if lastFunc then
- table.insert(matcher.functions, simple(lastFunc))
- lastFunc = nil
- end
- local cap = table.remove(cs)
- if not cap then
- error('invalid capture: "(" missing')
- end
- table.insert(matcher.functions, captureStop(cap))
- elseif c == '.' then
- if lastFunc then
- table.insert(matcher.functions, simple(lastFunc))
- end
- lastFunc = function(cC) return cC ~= -1 end
- elseif c == '%' then
- ignore = true
- else
- if lastFunc then
- table.insert(matcher.functions, simple(lastFunc))
- end
- lastFunc = classMatchGenerator(c)
- end
- end
- end
- end
- if #cs > 0 then
- error('invalid capture: ")" missing')
- end
- if lastFunc then
- table.insert(matcher.functions, simple(lastFunc))
- end
- lastFunc = nil
- ignore = nil
-
- table.insert(matcher.functions, function()
- if matcher.toEnd and matcher.str ~= matcher.stringLen then
- matcher:reset()
- else
- matcher.stop = true
- end
- end)
-
- matcher.nextFunc = function(self)
- self.func = self.func + 1
- end
- matcher.nextStr = function(self)
- self.str = self.str + 1
- end
- matcher.strReset = function(self)
- local oldReset = self.reset
- local str = self.str
- self.reset = function(s)
- s.str = str
- s.reset = oldReset
- end
- end
- matcher.fullResetOnNextFunc = function(self)
- local oldReset = self.reset
- local func = self.func +1
- local str = self.str
- self.reset = function(s)
- s.func = func
- s.str = str
- s.reset = oldReset
- end
- end
- matcher.fullResetOnNextStr = function(self)
- local oldReset = self.reset
- local str = self.str + 1
- local func = self.func
- self.reset = function(s)
- s.func = func
- s.str = str
- s.reset = oldReset
- end
- end
-
- matcher.process = function(self, str, start)
-
- self.func = 1
- start = start or 1
- self.startStr = (start >= 0) and start or utf8len(str) + start + 1
- self.seqStart = self.startStr
- self.str = self.startStr
- self.stringLen = utf8len(str) + 1
- self.string = str
- self.stop = false
-
- self.reset = function(s)
- s.func = 1
- end
-
- local lastPos = self.str
- local lastByte
- local char
- while not self.stop do
- if self.str < self.stringLen then
- --[[ if lastPos < self.str then
- print('last byte', lastByte)
- char, lastByte = utf8subWithBytes(str, 1, self.str - lastPos - 1, lastByte)
- char, lastByte = utf8subWithBytes(str, 1, 1, lastByte)
- lastByte = lastByte - 1
- else
- char, lastByte = utf8subWithBytes(str, self.str, self.str)
- end
- lastPos = self.str ]]
- char = utf8sub(str, self.str,self.str)
- --print('char', char, utf8unicode(char))
- self.functions[self.func](utf8unicode(char))
- else
- self.functions[self.func](-1)
- end
- end
-
- if self.seqStart then
- local captures = {}
- for _,pair in pairs(self.captures) do
- if pair.empty then
- table.insert(captures, pair[1])
- else
- table.insert(captures, utf8sub(str, pair[1], pair[2]))
- end
- end
- return self.seqStart, self.str - 1, unpack(captures)
- end
- end
-
- return matcher
-end
-
--- string.find
-local function utf8find(str, regex, init, plain)
- local matcher = cache[regex] or matcherGenerator(regex, plain)
- return matcher:process(str, init)
-end
-
--- string.match
-local function utf8match(str, regex, init)
- init = init or 1
- local found = {utf8find(str, regex, init)}
- if found[1] then
- if found[3] then
- return unpack(found, 3)
- end
- return utf8sub(str, found[1], found[2])
- end
-end
-
--- string.gmatch
-local function utf8gmatch(str, regex, all)
- regex = (utf8sub(regex,1,1) ~= '^') and regex or '%' .. regex
- local lastChar = 1
- return function()
- local found = {utf8find(str, regex, lastChar)}
- if found[1] then
- lastChar = found[2] + 1
- if found[all and 1 or 3] then
- return unpack(found, all and 1 or 3)
- end
- return utf8sub(str, found[1], found[2])
- end
- end
-end
-
-local function replace(repl, args)
- local ret = ''
- if type(repl) == 'string' then
- local ignore = false
- local num = 0
- for c in utf8gensub(repl) do
- if not ignore then
- if c == '%' then
- ignore = true
- else
- ret = ret .. c
- end
- else
- num = tonumber(c)
- if num then
- ret = ret .. args[num]
- else
- ret = ret .. c
- end
- ignore = false
- end
- end
- elseif type(repl) == 'table' then
- ret = repl[args[1] or args[0]] or ''
- elseif type(repl) == 'function' then
- if #args > 0 then
- ret = repl(unpack(args, 1)) or ''
- else
- ret = repl(args[0]) or ''
- end
- end
- return ret
-end
--- string.gsub
-local function utf8gsub(str, regex, repl, limit)
- limit = limit or -1
- local ret = ''
- local prevEnd = 1
- local it = utf8gmatch(str, regex, true)
- local found = {it()}
- local n = 0
- while #found > 0 and limit ~= n do
- local args = {[0] = utf8sub(str, found[1], found[2]), unpack(found, 3)}
- ret = ret .. utf8sub(str, prevEnd, found[1] - 1)
- .. replace(repl, args)
- prevEnd = found[2] + 1
- n = n + 1
- found = {it()}
- end
- return ret .. utf8sub(str, prevEnd), n
-end
-
-local utf8 = {}
-utf8.len = utf8len
-utf8.sub = utf8sub
-utf8.reverse = utf8reverse
-utf8.char = utf8char
-utf8.unicode = utf8unicode
-utf8.gensub = utf8gensub
-utf8.byte = utf8unicode
-utf8.find = utf8find
-utf8.match = utf8match
-utf8.gmatch = utf8gmatch
-utf8.gsub = utf8gsub
-utf8.dump = dump
-utf8.format = format
-utf8.lower = lower
-utf8.upper = upper
-utf8.rep = rep
-return utf8
\ No newline at end of file
projects / furrybot-discord.git / commitdiff