interpolation.vm

velocity 的脚本语言的全部代码集合

#*

@test interpolation.vm

This template is used for Velocity regression testing.
If you alter this template make sure you change the
corresponding comparison file so that the regression 
test doesn't fail incorrectly.

*#

Start with simple string interpolation :

#set($name = "jason")
$provider.concat("it will cost you $10.00", "")

#set($image = "dog")
$provider.concat("${image}.jpg", "")

#set($foo-bar = "foobar")
$provider.concat("${foo-bar}.jpg", "")

#set($foo_bar = "foobar")
$provider.concat("${foo_bar}.jpg", "")

#set($one = 1)
#set($two = 2)
#set($three = 3)
$provider.concat("${one}${two}${three}", "")
$provider.concat("$one $two $three", "")

How about a directive?  Sure :

#set($arr = ["a","b","c"])
#set($foo = "#foreach($a in $arr) >$a< #end")

$foo 

For our next trick, lets interpolate a.... VelociMacro!

#macro( interpfoo )
  Hi, I'm a VM!
#end

#set($ivm = "#interpfoo()")

$ivm

And now, for something completely different :

#set($code = "#if(false) True #else False #end")

$code

Now, non interpolated stringlits :

#set($a = "$code")
#set($b = '$code')
#set($c = '$!$\!code')

$a
$b
$c

-- end --