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55 lines
1.5 KiB
Nim
55 lines
1.5 KiB
Nim
discard """
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output: '''top level statements are executed!
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2.0
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my secret
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'''
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"""
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## Example program that demonstrates how to use the
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## compiler as an API to embed into your own projects.
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import "../../compiler" / [ast, vmdef, vm, nimeval]
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import std / [os]
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proc main() =
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let std = findNimStdLib()
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if std.len == 0:
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quit "cannot find Nim's standard library"
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var intr = createInterpreter("myscript.nim", [std, getAppDir()])
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intr.implementRoutine("*", "exposed", "addFloats", proc (a: VmArgs) =
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setResult(a, getFloat(a, 0) + getFloat(a, 1) + getFloat(a, 2))
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)
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intr.evalScript()
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let foreignProc = selectRoutine(intr, "hostProgramRunsThis")
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if foreignProc == nil:
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quit "script does not export a proc of the name: 'hostProgramRunsThis'"
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let res = intr.callRoutine(foreignProc, [newFloatNode(nkFloatLit, 0.9),
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newFloatNode(nkFloatLit, 0.1)])
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if res.kind == nkFloatLit:
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echo res.floatVal
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else:
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echo "bug!"
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let foreignValue = selectUniqueSymbol(intr, "hostProgramWantsThis")
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if foreignValue == nil:
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quit "script does not export a global of the name: hostProgramWantsThis"
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let val = intr.getGlobalValue(foreignValue)
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if val.kind in {nkStrLit..nkTripleStrLit}:
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echo val.strVal
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else:
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echo "bug!"
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destroyInterpreter(intr)
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if existsEnv("NIM_EXE_NOT_IN_PATH"):
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# effectively disable this test as 'nim' is not in the PATH so tcompilerapi
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# cannot find Nim's standard library:
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echo "top level statements are executed!"
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echo "2.0"
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echo "my secret"
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else:
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main()
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