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https://github.com/sbrl/Minetest-WorldEditAdditions.git
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89 lines
2.5 KiB
Lua
89 lines
2.5 KiB
Lua
-- Licence: GPLv2 (MPL-2.0 is compatible, so we can use this here)
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-- Source: https://stackoverflow.com/a/43582076/1460422
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-- gsplit: iterate over substrings in a string separated by a pattern
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--
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-- Parameters:
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-- text (string) - the string to iterate over
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-- pattern (string) - the separator pattern
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-- plain (boolean) - if true (or truthy), pattern is interpreted as a plain
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-- string, not a Lua pattern
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--
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-- Returns: iterator
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--
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-- Usage:
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-- for substr in gsplit(text, pattern, plain) do
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-- doSomething(substr)
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-- end
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local function gsplit(text, pattern, plain)
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local splitStart, length = 1, #text
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return function ()
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if splitStart then
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local sepStart, sepEnd = string.find(text, pattern, splitStart, plain)
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local ret
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if not sepStart then
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ret = string.sub(text, splitStart)
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splitStart = nil
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elseif sepEnd < sepStart then
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-- Empty separator!
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ret = string.sub(text, splitStart, sepStart)
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if sepStart < length then
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splitStart = sepStart + 1
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else
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splitStart = nil
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end
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else
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ret = sepStart > splitStart and string.sub(text, splitStart, sepStart - 1) or ''
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splitStart = sepEnd + 1
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end
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return ret
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end
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end
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end
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--- Split a string into substrings separated by a pattern. -- Deprecated
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-- @param text string The string to iterate over
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-- @param pattern string The separator pattern
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-- @param plain boolean If true (or truthy), pattern is interpreted as a
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-- plain string, not a Lua pattern
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-- @returns table A sequence table containing the substrings
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local function dsplit(text, pattern, plain)
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local ret = {}
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for match in gsplit(text, pattern, plain) do
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table.insert(ret, match)
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end
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return ret
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end
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--- Split a string into substrings separated by a pattern.
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-- @param str string The string to iterate over
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-- @param dlm string The delimiter (separator) pattern
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-- @param plain boolean If true (or truthy), pattern is interpreted as a
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-- plain string, not a Lua pattern
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-- @returns table A sequence table containing the substrings
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local function split(str,dlm,plain)
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local pos, ret = 0, {}
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local ins, i = str:find(dlm,pos,plain)
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-- "if plain" shaves off some time in the while statement
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if plain then
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while ins do
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table.insert(ret,str:sub(pos,ins - 1))
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pos = ins + #dlm
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ins = str:find(dlm,pos,true)
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end
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else
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while ins do
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table.insert(ret,str:sub(pos,ins - 1))
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pos = i + 1
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ins, i = str:find(dlm,pos)
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end
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end
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-- print(pos..","..#str)
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if str:sub(pos,#str) ~= "" then
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table.insert(ret,str:sub(pos,#str))
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end
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return ret
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end
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return split |