File: example.nim

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nim-kexpr 0.0.2-2
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import kexpr

var e = expression("5*6+x > 20")
e["x"] = 10
echo e.int
e["x"] = 20
echo e.int64
assert e.error() == 0

e = expression("(sample1 > 20 & sample2 > 10 & sample3 < 40")
# missing paren
assert e.error() != 0
e.clear()

e = expression("(sample1 > 20) & (sample2 > 10) & (sample3 < 40)")
e["sample1"] = 21; e["sample2"] = 65; e["sample3"] = 20
echo e.int # 1
e["sample1"] = 0
echo e.int # 0
assert e.error() == 0
echo e.float # 0.0