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discard """
output: '''top level statements are executed!
2.0
'''
"""
## Example program that demonstrates how to use the
## compiler as an API to embed into your own projects.
import "../../compiler" / [ast, vmdef, vm, nimeval]
import std / [os]
proc main() =
let std = findNimStdLib()
if std.len == 0:
quit "cannot find Nim's standard library"
var intr = createInterpreter("myscript.nim", [std, getAppDir()])
intr.declareRoutine("*", "exposed", "addFloats", proc (a: VmArgs) =
setResult(a, getFloat(a, 0) + getFloat(a, 1) + getFloat(a, 2))
)
intr.evalScript()
let foreignProc = selectRoutine(intr, "hostProgramRunsThis")
if foreignProc == nil:
quit "script does not export a proc of the name: 'hostProgramRunsThis'"
let res = intr.callRoutine(foreignProc, [newFloatNode(nkFloatLit, 0.9),
newFloatNode(nkFloatLit, 0.1)])
if res.kind == nkFloatLit:
echo res.floatVal
else:
echo "bug!"
destroyInterpreter(intr)
main()
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