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eval: Add builtin lt and gt.

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This commit is contained in:
Qi Xiao 2016-02-20 21:20:18 +01:00
parent 6ee16abba0
commit 4b05661c44
1 changed files with 20 additions and 0 deletions
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20
eval/builtin_func.go
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@ -79,6 +79,8 @@ func init() {
&BuiltinFn{"-", wrapFn(minus)},
&BuiltinFn{"mul", wrapFn(times)},
&BuiltinFn{"div", wrapFn(divide)},
&BuiltinFn{"lt", wrapFn(lt)},
&BuiltinFn{"gt", wrapFn(gt)},
&BuiltinFn{"=", eq},
&BuiltinFn{"deepeq", deepeq},
@ -482,6 +484,24 @@ func divide(ec *EvalCtx, prod float64, nums ...float64) {
out <- String(fmt.Sprintf("%g", prod))
}
var ErrFalse = errors.New("false")
func lt(ec *EvalCtx, nums ...float64) {
for i := 0; i < len(nums)-1; i++ {
if !(nums[i] < nums[i+1]) {
throw(ErrFalse)
}
}
}
func gt(ec *EvalCtx, nums ...float64) {
for i := 0; i < len(nums)-1; i++ {
if !(nums[i] > nums[i+1]) {
throw(ErrFalse)
}
}
}
var ErrNotEqual = errors.New("not equal")
func eq(ec *EvalCtx, args []Value) {