Common Template Engine

1. Expression Rule:
...

2. Standard Expression:
(1) getter:
. Property Getter, eg: ${user.name}
[] Index Getter, eg: ${user["name"]} ${user[nameVaribale]} ${items[1]} ${items[1..2]} ${items[1,2,4]}
[] Change to collection, eg: $for{num : [100]} $for{num : [name:value]}
(2) sequence:
: Entry Literal, eg: ${user.nameVar : "james"} ${name : "james"} Comment: variable key: ${$name : "james"}
.. Sequence Literal, eg: ${1..5} $for{seq : 1..5} $for{weekDay : "Sunday".."Saturday"}
, List Literal, eg: ${1,2,5,7} $for{seq : (1,2,5,7)}
:, Map Literal, eg: ${a : 100, b: 2, c : 7} $for{rel : (a : 100, b: 2, c : 7)}
(3) object:
== Value Equal Comparator , eg: ${user1 == user2}
!= Value Not Equal Comparator , eg: ${user1 != user2}
| Not Empty Selector , eg: ${user1 | user2} $for{user : (users1 | users2 | users3}
(4) boolean:
&& Logic And, eg: ${user1.agree && user2.agree}
|| Logic Or, eg: ${user1.agree || user2.agree}
! Logic Not, eg: ${! user1.agree}
?: Logic Select, eg: ${user1.agree ? "yes" : "no"}
(5) number:
+ Add Operator, eg: ${user1.coins + user2.coins}
- Subtract Operator, eg: ${user1.coins - user2.coins}
* Multiply Operator, eg: ${user.coins * 2}
/ Divide Operator, eg: ${user.coins / 2}
% Modulus Operator, eg: ${user.coins % 2}
> Greater Than Comparator, eg: ${user1.coins > user2.coins}
< Less Than Comparator, eg: ${user1.coins < user2.coins}
>= Greater Equal Comparator, eg: ${user1.coins >= user2.coins}
<= Less Equal Comparator, eg: ${user1.coins <= user2.coins}
~ Number Format, eg: ${user1.coins ~ "###,##0.###"}
(6) string:
+ String Concatenate, eg: ${user.firstname + user.lastname}
> Greater Than Comparator, eg: ${user1.name > user2.name}
< Less Than Comparator, eg: ${user1.name < user2.name}
>= Greater Equal Comparator, eg: ${user1.name >= user2.name}
<= Less Equal Comparator, eg: ${user1.name <= user2.name}
(7) date:
+ After Days, eg: ${user.registerDate + 3}
- Before Days, eg: ${user.registerDate - 3}
> Greater Than Comparator, eg: ${user1.registerDate > user2.registerDate}
< Less Than Comparator, eg: ${user1.registerDate < user2.registerDate}
>= Greater Equal Comparator, eg: ${user1.registerDate >= user2.registerDate}
<= Less Equal Comparator, eg: ${user1.registerDate <= user2.registerDate}
~ Date Format, eg: ${user.registerDate ~ "yyyy-MM-dd"}
(8) array,list,map:
+ List or Map Concatenate, eg: ${items + ("a","b")}

3. Property:
(1) boolean:
not, eg: ${true.not} ${user.allow.not}
(2) string:
capital , eg: ${"james".capital}
toDate, Convert To Date Type By "yyyy-MM-dd" Format, eg: $if{now > "2007-01-01".toDate}
toDateTime, Convert To Date Type By "yyyy-MM-dd HH:mm:ss" Format, eg: $if{now > "2007-01-01 23:10:05".toDateTime}
escapeHtml, eg: ${"<b>".escapeHtml}
toInteger, Convert To Integer Type, eg: ${"1".toInteger + 2}
toLong, Convert To Long Type, eg: ${"25".toInteger + 2}
toFloat, Convert To Float Type, eg: ${"1.2".toInteger + 2}
toDouble, Convert To Double Type, eg: ${"2.3".toInteger + 2}
(3) date:
year, month, day, hour, minute, second, millisecond Date parts getter, eg: ${createDate.day} ${createDate.hour}
dayInYear, eg: ${createDate.dayInYear}
week, eg: ${createDate.week}
era, eg: ${createDate.era}
century, eg: ${createDate.century}
timezone, eg: ${createDate.timezone}
leap, eg: $if{now.lenient}
toLong, compare with 1970-01-01 00:00:00.000, eg: ${createDate.toLong}
(4) long:
toDate, Long To Date, eg: ${9999999.toDate}

4. Sequence:
(1) Number: ${1 .. 20} ${20 .. -12}
(2) Letter: ${a .. z} ${z .. a} ${A .. Z} ${b .. k}
(3) Season: ${"Spring" .. "Winter"}
(4) Month: ${"January" .. "December"}
(5) Week: ${"Sunday" .. "Saturday"}