Merge pull request #509 from OpportunityLiu/dev

Improve string.serialize; add unit test

1 files changed, 69 insertions, 0 deletions

diff --git a/xmake/core/base/math.lua b/xmake/core/base/math.lua
new file mode 100644
index 000000000..d49e8a8b9
--- /dev/null
+++ b/xmake/core/base/math.lua
@@ -0,0 +1,69 @@
+--!A cross-platform build utility based on Lua
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+--
+-- Copyright (C) 2015 - 2019, TBOOX Open Source Group.
+--
+-- @author      OpportunityLiu
+-- @file        math.lua
+--
+
+-- define module
+local math = math or {}
+
+-- init constants
+math.nan   = math.log(-1)
+math.e     = math.exp(1)
+
+-- check a number is int
+--
+-- @returns true for int, otherwise false
+function math:isint()
+
+    -- check
+    assert(type(self) == "number", "number expacted")
+
+    return self == math.floor(self) and self ~= math.huge and self ~= -math.huge
+end
+
+-- check a number is inf or -inf
+--
+-- @returns 1 for inf,  -1 for -inf, otherwise false
+function math:isinf()
+
+    -- check
+    assert(type(self) == "number", "number expacted")
+
+    if self == math.huge then
+        return 1
+    elseif self == -math.huge then
+        return -1
+    else
+        return false
+    end
+end
+
+-- check a number is nan
+--
+-- @returns true for nan, otherwise false
+function math:isnan()
+
+    -- check
+    assert(type(self) == "number", "number expacted")
+
+    return self ~= self
+end
+
+
+-- return module
+return math