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b72938c861
An existing hint lets apps that don't need the timer resolution changed avoid this, to save battery, etc, but this fixes several problems in timing, audio callbacks not firing fast enough, etc. Fixes Bugzilla #2944.
104 lines
3.2 KiB
Lua
Executable file
104 lines
3.2 KiB
Lua
Executable file
-- 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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