From 5f3d78508f0cc7cbdc84ad1dc2bd27eded88436c Mon Sep 17 00:00:00 2001
From: lijie <1713699517@qq.com>
Date: Fri, 13 May 2022 10:39:26 +0800
Subject: [PATCH] =?UTF-8?q?ft:=20=E8=BF=90=E7=AE=97=E7=AC=A6=E7=9B=B8?=
 =?UTF-8?q?=E6=97=A5=E5=BF=97=E6=8F=90=E4=BA=A4?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 include/utComMisc.hrl              |  4 ++
 src/docs/erlang/erlang运算符.md | 74 ++++++++++++++++++++++++++++++
 src/docs/erlang/etsmatch.hrl.md    | 21 +++++++++
 3 files changed, 99 insertions(+)
 create mode 100644 src/docs/erlang/erlang运算符.md
 create mode 100644 src/docs/erlang/etsmatch.hrl.md

diff --git a/include/utComMisc.hrl b/include/utComMisc.hrl
index c390a77..d4c1e46 100644
--- a/include/utComMisc.hrl
+++ b/include/utComMisc.hrl
@@ -1,6 +1,10 @@
 %% 三目元算符
 -define(IIF(Cond, Then, That), case Cond of true -> Then; _ -> That end).
 
+%% IF-DO表达式
+-define(IF(IFTure, DoThat), (IFTure) andalso DoThat).
+
+
 %%汉字unicode编码范围 0x4e00 - 0x9fa5
 -define(UNICODE_CHINESE_BEGIN, (4 * 16 * 16 * 16 + 14 * 16 * 16)).
 -define(UNICODE_CHINESE_END, (9 * 16 * 16 * 16 + 15 * 16 * 16 + 10 * 16 + 5)).
diff --git a/src/docs/erlang/erlang运算符.md b/src/docs/erlang/erlang运算符.md
new file mode 100644
index 0000000..8eae461
--- /dev/null
+++ b/src/docs/erlang/erlang运算符.md
@@ -0,0 +1,74 @@
+# Erlang运算符：
+
+        1、算术运算符：  +， -， *， /， div,  rem,
+
+                1、"/", 用于除，但是其结果永远是浮点数， 即不管是否整除
+
+                2、div， 除， 取结果的整数部分
+
+                3、rem,  取模
+
+        2、比较运算符： >， <， >=， =<,  ==,  =:=,  /= ,  =/=
+
+                1、=<， 小于等于
+
+                2、==， 比较两个值是否相等, eg:  1  == 1.0.   结果为：  true
+
+                3、=:=,   比较两个值是否相等，并且两个对象的类型也必须相等,  eg:  1 =:= 1.0.  结果为： false
+
+                4、/=,    不相等， eg:   1 /= 1.0.   结果为： false
+
+                5、=/=,  不全等， eg：  1 =/= 1.0，结果为: true
+
+        3、位运算符：band, bor, bnot, bxor, bsl, bsr
+
+                1、band, 位与
+
+                2、bor,   位或
+
+                3、bnot,  位非
+
+                4、bxor, 按位异或
+
+                5、bsl,   按位左移， eg:  1 bsl 5.   %将1左移5位，结果为32
+
+                6、bsr,   按位右移
+
+        4、逻辑运算符：(运算符两边的表达式都会计算)
+
+                1、not,   逻辑非
+
+                2、and,   逻辑与
+
+                3、or，    逻辑或
+
+                4、xor，  逻辑异或
+
+         5、短路逻辑运算符：(如果前部分能得出结果，就不会计算另一个表达式)
+
+                1、andalso , X andalso Y,  如果X为true，则会执行Y，如果X为false,则不会计算Y，直接false
+
+                2、orelse， X orelse Y, 如果X为true，则结果为true，不会计算Y
+
+        6、运算符优先级：
+
+#		操作符                   								结合性
+		1. ：
+		
+		2. #
+		
+		3. (一元)+, (一元)-, bnot, not
+		
+		4. /,  * , div, rem, band, and     						左到右
+		
+		5. +, -, bor,  bxor,  bsl,  bsr, or, xor
+		
+		6. ++,   --
+		
+		7. ==, /=, =<, <, >=, =:=, =/=							右到左，  即列表的操作，是将左边加到右边			
+		
+		8. andalso
+		
+		9. orelse
+		 
+		10. =												   右到左
\ No newline at end of file
diff --git a/src/docs/erlang/etsmatch.hrl.md b/src/docs/erlang/etsmatch.hrl.md
new file mode 100644
index 0000000..57c0e34
--- /dev/null
+++ b/src/docs/erlang/etsmatch.hrl.md
@@ -0,0 +1,21 @@
+-type matchExpression() :: [ matchFunction(), ... ].
+
+-type matchFunction() :: { matchHead(), matchConditions(), matchBody()}.
+
+-type matchHead() :: matchVariable() | '_' | { matchHeadPart(), ...}.
+
+-type matchHeadPart() :: term() | matchVariable() | '_'.
+
+-type matchVariable() :: '$<number>'.
+
+-type matchConditions() :: [ matchCondition(), ...] | [].
+
+-type matchCondition() :: { guardFunction() } | { guardFunction(), conditionExpression(), ... }.
+-type boolFunction() :: is_atom | is_float | is_integer | is_list | is_number | is_pid | is_port | is_reference | is_tuple | is_map | map_is_key | is_binary | is_function | is_record | 'and' | 'or' | 'not' | 'xor' | 'andalso' | 'orelse'.
+-type conditionExpression() :: exprMatchVariable() | { guardFunction() } | { guardFunction(), conditionExpression(), ... } | termConstruct().
+-type exprMatchVariable() :: matchVariable() (bound in the MatchHead) | '$_' | '$$'
+-type termConstruct():: {{}} | {{ conditionExpression(), ... }} | [] | [conditionExpression(), ...] | #{} | #{term() => conditionExpression(), ...} | nonCompositeTerm() | constant().
+-type nonCompositeTerm() :: term(). %%   (not list or tuple or map)
+-type constant() :: {const, term()}.
+-type guardFunction() :: boolFunction() | abs | element | hd | length | map_get | map_size | node | round | size | bit_size | tl | trunc | '+' | '-' | '*' | 'div' | 'rem' | 'band' | 'bor' | 'bxor' | 'bnot' | 'bsl' | 'bsr' | '>' | '>=' | '<' | '=<' | '=:=' | '==' | '=/=' | '/=' | self.
+-type matchBody() :: [ conditionExpression(), ... ].
\ No newline at end of file