104 lines
3.2 KiB
Lua
104 lines
3.2 KiB
Lua
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-- Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
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--
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-- This software is provided 'as-is', without any express or implied
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-- warranty. In no event will the authors be held liable for any damages
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-- arising from the use of this software.
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--
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-- Permission is granted to anyone to use this software for any purpose,
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-- including commercial applications, and to alter it and redistribute it
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-- freely.
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--
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-- Meta-build system using premake created and maintained by
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-- Benjamin Henning <b.henning@digipen.edu>
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--[[
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sdl_string.lua
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Contains a few convenient string utility functions which are not supported in
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Lua or not supported as intended.
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]]
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-- Performs a non-pattern based substring search of one string in another
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-- string. It's of O(n^2) complexity. It returns nil if the result cannot be
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-- found, otherwise it returns the starting index of the first found occurrence.
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string.indexOf = function(str, substr)
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local pos = 1
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local i = 1
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for i = 1, str:len(), 1 do
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if str:sub(i, i) == substr:sub(pos, pos) then
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-- have we matched the complete string?
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if pos == substr:len() then
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return i - pos + 1-- starting pos
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end
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-- matched character...keep going
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pos = pos + 1
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else
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-- restart, no match
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pos = 0
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end
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end
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if pos == substr:len() then
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return i - pos + 1
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end
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return nil -- no match
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end
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-- This is a public-access version of the explode function defined below.
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function explode(str, delim)
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return str:explode(delim)
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end
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-- Explodes a string into an array of elements, separated by a non-pattern
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-- delimiter. This function is part of the string table, allowing for a
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-- member-based invocation for strings.
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string.explode = function(str, delim)
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local exploded = { }
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local needle = string.find(str, delim)
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while needle ~= nil do
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table.insert(exploded, string.sub(str, 0, needle - 1))
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str = string.sub(str, needle + 1)
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needle = string.find(str, delim)
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end
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table.insert(exploded, str)
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return exploded
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end
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-- Similar to table.concat, except it supports more advanced token pasting. This
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-- function is vastly used by the main meta-build script (premake4.lua) to
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-- generate all the main lines of code for various tables that need to be in the
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-- generated lua file.
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-- - tbl: table of values to implode into a string
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-- - prefix: string to paste before entire result
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-- - pre: string to always paste before each entry in table
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-- - post: string to always paste after each entry in table
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-- - join: string to paste between entries (inclusive)
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-- - suffix: string to paste after entire result
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-- Returns the imploded string.
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function implode(tbl, prefix, pre, post, join, suffix)
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local result = ""
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-- not the most efficient way to do this, but...
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local itbl = { }
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for k,v in pairs(tbl) do
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itbl[#itbl + 1] = v
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end
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for i = 1, #itbl, 1 do
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if pre ~= nil then
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result = result .. pre
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end
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result = result .. itbl[i]
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if post ~= nil then
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result = result .. post
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end
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if i ~= #itbl then
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result = result .. join
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end
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end
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if prefix ~= nil then
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result = prefix .. result
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end
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if suffix ~= nil then
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result = result .. suffix
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end
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return result
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end
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