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--!A cross-platform build utility based on Lua
--
-- Licensed to the Apache Software Foundation (ASF) under one
-- or more contributor license agreements. See the NOTICE file
-- distributed with this work for additional information
-- regarding copyright ownership. The ASF licenses this file
-- to you under the Apache License, Version 2.0 (the
-- "License"); you may not use this file except in compliance
-- with the License. You may obtain a copy of the License at
--
-- http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
--
-- Copyright (C) 2015 - 2018, TBOOX Open Source Group.
--
-- @author ruki
-- @file string.lua
--
-- define module: string
local string = string or {}
-- find the last substring with the given pattern
function string:find_last(pattern, plain)
-- find the last substring
local curr = 0
repeat
local next = self:find(pattern, curr + 1, plain)
if next then
curr = next
end
until (not next)
-- found?
if curr > 0 then
return curr
end
end
-- split string with the given characters
--
-- ("1\n\n2\n3"):split('\n') => 1, 2, 3
-- ("1\n\n2\n3"):split('\n', true) => 1, , 2, 3
--
function string:split(delimiter, strict)
local result = {}
if strict then
for match in (self .. delimiter):gmatch("(.-)" .. delimiter) do
table.insert(result, match)
end
else
self:gsub("[^" .. delimiter .."]+", function(v) table.insert(result, v) end)
end
return result
end
-- trim the spaces
function string:trim()
return (self:gsub("^%s*(.-)%s*$", "%1"))
end
-- trim the left spaces
function string:ltrim()
return (self:gsub("^%s*", ""))
end
-- trim the right spaces
function string:rtrim()
local n = #self
while n > 0 and s:find("^%s", n) do n = n - 1 end
return self:sub(1, n)
end
-- append a substring with a given separator
function string:append(substr, separator)
-- check
assert(self)
-- not substr? return self
if not substr then
return self
end
-- append it
local s = self
if #s == 0 then
s = substr
else
s = string.format("%s%s%s", s, separator or "", substr)
end
-- ok
return s
end
-- encode: ' ', '=', '\"', '<'
function string:encode()
-- null?
if self == nil then return end
-- done
return (self:gsub("[%s=\"<]", function (w) return string.format("%%%x", w:byte()) end))
end
-- decode: ' ', '=', '\"'
function string:decode()
-- null?
if self == nil then return end
-- done
return (self:gsub("%%(%x%x)", function (w) return string.char(tonumber(w, 16)) end))
end
-- join array to string with the given separator
function string.join(items, sep)
-- join them
local str = ""
local index = 1
local count = #items
for _, item in ipairs(items) do
str = str .. item
if index ~= count and sep ~= nil then
str = str .. sep
end
index = index + 1
end
-- ok?
return str
end
-- try to format
function string.tryformat(format, ...)
-- attempt to format it
local ok, str = pcall(string.format, format, ...)
if ok then
return str
else
return format
end
end
-- return module: string
return string
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