From: Elias Fleckenstein <eliasfleckenstein@web.de>
Date: Sun, 30 Jan 2022 16:30:19 +0000 (+0100)
Subject: Copy more code from Minetest
X-Git-Url: https://git.lizzy.rs/?a=commitdiff_plain;h=HEAD;p=luax.git

Copy more code from Minetest
---

diff --git a/init.lua b/init.lua
index 38b4b23..257767b 100644
--- a/init.lua
+++ b/init.lua
@@ -1,7 +1,3 @@
-function math.clamp(min, max, v)
-	return math.max(max, math.min(min, v))
-end
-
 function string.split(str, delim, include_empty, max_splits, sep_is_pattern)
 	delim = delim or ","
 	max_splits = max_splits or -2
@@ -26,6 +22,57 @@ function string.split(str, delim, include_empty, max_splits, sep_is_pattern)
 	return items
 end
 
+function table.indexof(list, val)
+	for i, v in ipairs(list) do
+		if v == val then
+			return i
+		end
+	end
+	return -1
+end
+
+function string:trim()
+	return (self:gsub("^%s*(.-)%s*$", "%1"))
+end
+
+function math.hypot(x, y)
+	return math.sqrt(x * x + y * y)
+end
+
+function math.sign(x, tolerance)
+	tolerance = tolerance or 0
+	if x > tolerance then
+		return 1
+	elseif x < -tolerance then
+		return -1
+	end
+	return 0
+end
+
+function math.factorial(x)
+	assert(x % 1 == 0 and x >= 0, "factorial expects a non-negative integer")
+	if x >= 171 then
+		-- 171! is greater than the biggest double, no need to calculate
+		return math.huge
+	end
+	local v = 1
+	for k = 2, x do
+		v = v * k
+	end
+	return v
+end
+
+function math.round(x)
+	if x >= 0 then
+		return math.floor(x + 0.5)
+	end
+	return math.ceil(x - 0.5)
+end
+
+function math.clamp(min, max, v)
+	return math.max(max, math.min(min, v))
+end
+
 function table.copy(t, seen)
 	local n = {}
 	seen = seen or {}
@@ -36,3 +83,31 @@ function table.copy(t, seen)
 	end
 	return n
 end
+
+function table.insert_all(t, other)
+	for i=1, #other do
+		t[#t + 1] = other[i]
+	end
+	return t
+end
+
+function table.key_value_swap(t)
+	local ti = {}
+	for k,v in pairs(t) do
+		ti[v] = k
+	end
+	return ti
+end
+
+function table.shuffle(t, from, to, random)
+	from = from or 1
+	to = to or #t
+	random = random or math.random
+	local n = to - from + 1
+	while n > 1 do
+		local r = from + n-1
+		local l = from + random(0, n-1)
+		t[l], t[r] = t[r], t[l]
+		n = n-1
+	end
+end