premake/util/sdl_string.lua
author Ryan C. Gordon
Tue, 29 Dec 2015 02:29:56 -0500
changeset 9986 081fbd89a347
parent 9619 b94b6d0bff0f
child 9998 f67cf37e9cd4
permissions -rwxr-xr-x
NetBSD: improved joystick support (thanks, Thomas!).

This patch skips non-joystick HID devices and gives joysticks on NetBSD
a human readable name.

Fixes Bugzilla #3178.
     1 -- Copyright (C) 1997-2015 Sam Lantinga <slouken@libsdl.org>
     2 --
     3 -- This software is provided 'as-is', without any express or implied
     4 -- warranty.  In no event will the authors be held liable for any damages
     5 -- arising from the use of this software.
     6 --
     7 -- Permission is granted to anyone to use this software for any purpose,
     8 -- including commercial applications, and to alter it and redistribute it
     9 -- freely.
    10 --
    11 -- Meta-build system using premake created and maintained by
    12 -- Benjamin Henning <b.henning@digipen.edu>
    13 
    14 --[[
    15 sdl_string.lua
    16 
    17 	Contains a few convenient string utility functions which are not supported in
    18 	Lua or not supported as intended.
    19 ]]
    20 
    21 -- Performs a non-pattern based substring search of one string in another
    22 -- string. It's of O(n^2) complexity. It returns nil if the result cannot be
    23 -- found, otherwise it returns the starting index of the first found occurrence.
    24 string.indexOf = function(str, substr)
    25 	local pos = 1
    26 	local i = 1
    27 	for i = 1, str:len(), 1 do
    28 		if str:sub(i, i) == substr:sub(pos, pos) then
    29 			-- have we matched the complete string?
    30 			if pos == substr:len() then
    31 				return i - pos + 1-- starting pos
    32 			end
    33 			-- matched character...keep going
    34 			pos = pos + 1
    35 		else
    36 			-- restart, no match
    37 			pos = 0
    38 		end
    39 	end
    40 	if pos == substr:len() then
    41 		return i - pos + 1
    42 	end
    43 	return nil -- no match
    44 end
    45 
    46 -- This is a public-access version of the explode function defined below.
    47 function explode(str, delim)
    48 	return str:explode(delim)
    49 end
    50 
    51 -- Explodes a string into an array of elements, separated by a non-pattern
    52 -- delimiter. This function is part of the string table, allowing for a
    53 -- member-based invocation for strings.
    54 string.explode = function(str, delim)
    55 	local exploded = { }
    56 	local needle = string.find(str, delim)
    57 	while needle ~= nil do
    58 		table.insert(exploded, string.sub(str, 0, needle - 1))
    59 		str = string.sub(str, needle + 1)
    60 		needle = string.find(str, delim)
    61 	end
    62 	table.insert(exploded, str)
    63 	return exploded
    64 end
    65 
    66 -- Similar to table.concat, except it supports more advanced token pasting. This
    67 -- function is vastly used by the main meta-build script (premake4.lua) to
    68 -- generate all the main lines of code for various tables that need to be in the
    69 -- generated lua file.
    70 --  - tbl: table of values to implode into a string
    71 --  - prefix: string to paste before entire result
    72 --  - pre: string to always paste before each entry in table
    73 --  - post: string to always paste after each entry in table
    74 --  - join: string to paste between entries (inclusive)
    75 --  - suffix: string to paste after entire result
    76 -- Returns the imploded string.
    77 function implode(tbl, prefix, pre, post, join, suffix)
    78 	local result = ""
    79 	-- not the most efficient way to do this, but...
    80 	local itbl = { }
    81 	for k,v in pairs(tbl) do
    82 		itbl[#itbl + 1] = v
    83 	end
    84 	for i = 1, #itbl, 1 do
    85 		if pre ~= nil then
    86 			result = result .. pre
    87 		end
    88 		result = result .. itbl[i]
    89 		if post ~= nil then
    90 			result = result .. post
    91 		end
    92 		if i ~= #itbl then
    93 			result = result .. join
    94 		end
    95 	end
    96 	if prefix ~= nil then
    97 		result = prefix .. result
    98 	end
    99 	if suffix ~= nil then
   100 		result = result .. suffix
   101 	end
   102 	return result
   103 end