Hi Christopher, We added this in Velocity 1.5. It automatically casts between different types of numbers as appropriate.
WILL On Tue, Aug 14, 2012 at 11:25 AM, Christopher Schultz < ch...@christopherschultz.net> wrote: > All, > > I seem to recall that in one of the (semi-)recent releases, Velocity > started supporting floating-point values for mathematical operators (+, > -, *, /) as well as comparisons (<, >, <=, >=, ==), but I can't find > anything in the documentation that suggests that this is the case. > > A simple test run against Velocity 1.7 works as I expect: > > Here is some math: > #set($fourAndAHalf = 4.5) > $fourAndAHalf ($fourAndAHalf.class.name) > #set($halfThat = $fourAndAHalf / 2) > $halfThat ($halfThat.class.name) > #if($fourAndAHalf > $halfThat) > works > #else > confused > #end > > That is, the output of this script is: > > " > Here is some math: > 4.5 (java.lang.Double) > 2.25 (java.lang.Double) > works > " > > So, it appears that floating-point math is supported. When attempting to > run the same template under Velocity 1.4, I get this exception: > > Exception in thread "main" > org.apache.velocity.exception.ParseErrorException: Lexical error: > org.apache.velocity.runtime.parser.TokenMgrError: Lexical error at line > 2, column 24. Encountered: "5" (53), after : "." > at > org.apache.velocity.app.VelocityEngine.evaluate(VelocityEngine.java:286) > at VelocityDriver.main(VelocityDriver.java:70) > > It seems clear that Velocity 1.4 does not support floating-point math > but that Velocity 1.7 does. Is it documented anywhere that 1.7 (or 1.6?) > supports floating-point math directly in the templates? > > I have an old project that uses Velocity-Tools' MathTool to do all kinds > of stuff and I'd like to remove all that for clarity, but I need to be > reasonably confident that I can do that -- at least to a certain degree > (e.g. simple math works, but certain operators don't support floats). > > Thanks, > -chris > >
