modlib/text.lua
2021-03-27 20:11:07 +01:00

166 lines
4.1 KiB
Lua

function upper_first(text) return text:sub(1, 1):upper() .. text:sub(2) end
function lower_first(text) return text:sub(1, 1):lower() .. text:sub(2) end
function starts_with(text, start) return text:sub(1, start:len()) == start end
function ends_with(text, suffix) return text:sub(text:len() - suffix:len() + 1) == suffix end
function trim(text, to_remove)
local j = 1
for i = 1, string.len(text) do
if text:sub(i, i) ~= to_remove then
j = i
break
end
end
local k = 1
for i = string.len(text), j, -1 do
if text:sub(i, i) ~= to_remove then
k = i
break
end
end
return text:sub(j, k)
end
function trim_begin(text, to_remove)
local j = 1
for i = 1, string.len(text) do
if text:sub(i, i) ~= to_remove then
j = i
break
end
end
return text:sub(j)
end
trim_left = trim_begin
function trim_end(text, to_remove)
local k = 1
for i = string.len(text), 1, -1 do
if text:sub(i, i) ~= to_remove then
k = i
break
end
end
return text:sub(1, k)
end
trim_right = trim_end
local inputstream_metatable = {
__index = {read = function(self, count)
local cursor = self.cursor + 1
self.cursor = self.cursor + count
local text = self.text:sub(cursor, self.cursor)
return text ~= "" and text or nil
end}
}
function inputstream(text)
return setmetatable({text = text, cursor = 0}, inputstream_metatable)
end
function hexdump(text)
local dump = {}
for index = 1, text:len() do
dump[index] = ("%02X"):format(text:byte(index))
end
return table.concat(dump)
end
function split(text, delimiter, limit, is_regex)
limit = limit or math.huge
local no_regex = not is_regex
local parts = {}
local occurences = 1
local last_index = 1
local index = string.find(text, delimiter, 1, no_regex)
while index and occurences < limit do
table.insert(parts, string.sub(text, last_index, index - 1))
last_index = index + string.len(delimiter)
index = string.find(text, delimiter, index + string.len(delimiter), no_regex)
occurences = occurences + 1
end
table.insert(parts, string.sub(text, last_index))
return parts
end
function split_without_limit(text, delimiter, is_regex) return split(text, delimiter, nil, is_regex) end
split_unlimited = split_without_limit
function split_lines(text, limit) return modlib.text.split(text, "\r?\n", limit, true) end
function lines(text) return text:gmatch"[^\r\n]*" end
local zero = string.byte"0"
local nine = string.byte"9"
local letter_a = string.byte"A"
local letter_f = string.byte"F"
function is_hexadecimal(byte)
return byte >= zero and byte <= nine or byte >= letter_a and byte <= letter_f
end
magic_chars = {
"%",
"(",
")",
".",
"+",
"-",
"*",
"?",
"[",
"^",
"$"
}
local magic_charset = {}
for _, magic_char in pairs(magic_chars) do table.insert(magic_charset, "%" .. magic_char) end
magic_charset = "[" .. table.concat(magic_charset) .. "]"
function escape_magic_chars(text) return text:gsub("(" .. magic_charset .. ")", "%%%1") end
function utf8(number)
if number < 0x007F then
-- Single byte
return string.char(number)
end
if number < 0x00A0 or number > 0x10FFFF then
-- Out of range
return
end
local result = ""
local i = 0
while true do
local remainder = number % 64
result = string.char(128 + remainder) .. result
number = (number - remainder) / 64
i = i + 1
if number <= 2 ^ (8 - i - 2) then break end
end
return string.char(256 - 2 ^ (8 - i - 1) + number) .. result
end
--+ deprecated
function handle_ifdefs(code, vars)
local finalcode = {}
local endif
local after_endif = -1
local ifdef_pos, after_ifdef = string.find(code, "--IFDEF", 1, true)
while ifdef_pos do
table.insert(finalcode, string.sub(code, after_endif + 2, ifdef_pos - 1))
local linebreak = string.find(code, "\n", after_ifdef + 1, true)
local varname = string.sub(code, after_ifdef + 2, linebreak - 1)
endif, after_endif = string.find(code, "--ENDIF", linebreak + 1, true)
if not endif then break end
if vars[varname] then
table.insert(finalcode, string.sub(code, linebreak + 1, endif - 1))
end
ifdef_pos, after_ifdef = string.find(code, "--IFDEF", after_endif + 1, true)
end
table.insert(finalcode, string.sub(code, after_endif + 2))
return table.concat(finalcode, "")
end