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--
-- Copyright (c) 2021-2023 Zeping Lee
-- Released under the MIT license.
-- Repository: https://github.com/zepinglee/citeproc-lua
--
local unicode = {}
local sln = require("unicode")
local uni_case = require("lua-uni-case")
local uni_words = nil
if kpse.find_file("lua-uni-words", "lua") then
uni_words = require("lua-uni-words")
end
local util = require("citeproc-util")
---Return a copy of the string with its first character capitalized and the rest lowercased.
---@param str string
---@param locale string?
---@return string
function unicode.capitalize(str, locale)
if type(str) ~= "string" then
error(string.format("bad argument #1 to 'capitalize' (string expected, got %s)", type(str)))
end
-- TODO: locale and unicode titlecase Lt
str = unicode.lower(str, locale)
str = sln.grapheme.gsub(str, ".", sln.grapheme.upper, 1)
return str
end
---Return a casefolded copy of the string. Casefolded strings may be used for caseless matching.
---@param str string
---@param locale string?
---@return string
function unicode.casefold(str, locale)
if type(str) ~= "string" then
error(string.format("bad argument #1 to 'casefold' (string expected, got %s)", type(str)))
end
local enable_special = false
if locale and string.match(locale, "^tr") then
enable_special = true
end
return uni_case.casefold(str, true, enable_special)
end
---Return True if all characters in the string are alphanumeric and there is at least one character, False otherwise.
---@param str string
---@return boolean
function unicode.isalnum(str)
if type(str) ~= "string" then
error(string.format("bad argument #1 to 'isalnum' (string expected, got %s)", type(str)))
end
return sln.grapheme.match(str, "^%w+$") ~= nil
end
---Return True if all characters in the string are alphabetic and there is at least one character, False otherwise.
---@param str string
---@return boolean
function unicode.isalpha(str)
if type(str) ~= "string" then
error(string.format("bad argument #1 to 'isalpha' (string expected, got %s)", type(str)))
end
return sln.grapheme.match(str, "^%a+$") ~= nil
end
---Return True if the string is empty or all characters in the string are ASCII, False otherwise.
---@param str string
---@return boolean
function unicode.isascii(str)
if type(str) ~= "string" then
error(string.format("bad argument #1 to 'isascii' (string expected, got %s)", type(str)))
end
return string.match(str, "^[\0-\x7F]+$") ~= nil
end
---Return True if all characters in the string are digits and there is at least one character, False otherwise.
---@param str string
---@return boolean
function unicode.isdigit(str)
if type(str) ~= "string" then
error(string.format("bad argument #1 to 'isdigit' (string expected, got %s)", type(str)))
end
return string.match(str, "^%d+$") ~= nil
end
---Return True if all cased characters in the string are lowercase and there is at least one cased character, False otherwise.
---@param str string
---@return boolean
function unicode.islower(str)
if type(str) ~= "string" then
error(string.format("bad argument #1 to 'islower' (string expected, got %s)", type(str)))
end
--TODO: No titlecased letters
return sln.grapheme.find(str, "%l") and not sln.grapheme.find(str, "%u")
end
---Return True if all characters in the string are numeric characters, and there is at least one character, False otherwise.
---@param str string
---@return boolean
function unicode.isnumeric(str)
if type(str) ~= "string" then
error(string.format("bad argument #1 to 'isnumeric' (string expected, got %s)", type(str)))
end
return string.match(str, "^%n+$") ~= nil
end
-- ---Return True if the string is a titlecased string and there is at least one character, for example uppercase characters may only follow uncased characters and lowercase characters only cased ones. Return False otherwise.
-- ---@param str string
-- ---@return boolean
-- function unicode.istitle(str)
-- if type(str) ~= "string" then
-- error(string.format("bad argument #1 to 'istitle' (string expected, got %s)", type(str)))
-- end
-- error("Not implemented")
-- return false
-- end
---Return True if all cased characters in the string are uppercase and there is at least one cased character, False otherwise.
---@param str string
---@return boolean
function unicode.isupper(str)
if type(str) ~= "string" then
error(string.format("bad argument #1 to 'isupper' (string expected, got %s)", type(str)))
end
--TODO: No titlecased letters
return sln.grapheme.find(str, "%u") and not sln.grapheme.find(str, "%l")
end
---Return a copy of the string with all the cased characters converted to lowercase.
---@param str string
---@param locale string?
---@return string
function unicode.lower(str, locale)
if type(str) ~= "string" then
error(string.format("bad argument #1 to 'lower' (string expected, got %s)", type(str)))
end
-- TODO: locale
return sln.grapheme.lower(str)
end
-- ---Return a titlecased version of the string where words start with an uppercase character and the remaining characters are lowercase.
-- ---@param str string
-- ---@param locale string?
-- ---@return string
-- function unicode.title(str, locale)
-- if type(str) ~= "string" then
-- error(string.format("bad argument #1 to 'title' (string expected, got %s)", type(str)))
-- end
-- error("Not implemented")
-- end
---Return a copy of the string with all the cased characters converted to uppercase.
---@param str string
---@param locale string?
---@return string
function unicode.upper(str, locale)
if type(str) ~= "string" then
error(string.format("bad argument #1 to 'upper' (string expected, got %s)", type(str)))
end
-- TODO: locale
return sln.grapheme.lower(str)
end
---@enum CharState
local CharState = {
Other = 0,
Word = 1,
Punctuation = 2,
Space = 3,
}
---@param str string
---@return string[]
function unicode.words(str)
local words = {}
if uni_words then
for _, _, segment in uni_words.word_boundaries(str) do
if unicode.isalnum(segment) then
table.insert(words, segment)
end
end
else
-- A naive implementation
local state = CharState.Other
local last_idx = 1
for idx, char in sln.grapheme.gmatch(str, "()(.)") do
local new_state = CharState.Other
if sln.grapheme.match(char, "%w") or char == "'" or char == "’" or char == "`" then
new_state = CharState.Word
else
new_state = CharState.Other
end
if new_state ~= state then
if idx > 1 and state == CharState.Word then
local segment = string.sub(str, last_idx, idx - 1)
table.insert(words, segment)
end
state = new_state
last_idx = idx
end
end
if state == CharState.Word then
local segment = string.sub(str, last_idx, #str)
table.insert(words, segment)
end
end
return words
end
---@param str string
---@return string[]
function unicode.split_word_bounds(str)
local segments = {}
if uni_words then
for _, _, segment in uni_words.word_boundaries(str) do
table.insert(segments, segment)
end
else
-- A naive implementation
local state = CharState.Other
local last_idx = 1
for idx, char in sln.grapheme.gmatch(str, "()(.)") do
local new_state = CharState.Other
if sln.grapheme.match(char, "%w") or char == "'" or char == "’" or char == "`" then
new_state = CharState.Word
elseif sln.grapheme.match(char, "%p") then
new_state = CharState.Punctuation
elseif sln.grapheme.match(char, "%s") then
new_state = CharState.Space
else
new_state = CharState.Other
end
if new_state ~= state then
if idx > 1 then
local segment = string.sub(str, last_idx, idx - 1)
table.insert(segments, segment)
end
state = new_state
last_idx = idx
end
end
local segment = string.sub(str, last_idx, #str)
table.insert(segments, segment)
end
return segments
end
return unicode
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