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engine: resources, lang: funcs, parser: Add panic magic

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It's valuable to check your runtime values and to shut down the entire
engine in case something doesn't match. This patch adds some magic
plumbing to support a "panic" mechanism.

A new "panic" statement gets transparently converted into a panic
function and panic resource. The former errors if the input is not
empty. The latter must be present to consume the value, but doesn't
actually do anything.
This commit is contained in:
James Shubin
2023-11-28 13:49:31 -05:00
parent 64e6e686e0
commit 2cbce963b7
12 changed files with 328 additions and 17 deletions
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31
lang/interpret_test.go
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@@ -514,6 +514,7 @@ func TestAstFunc2(t *testing.T) {
const magicErrorSetScope = "errSetScope: "
const magicErrorUnify = "errUnify: "
const magicErrorGraph = "errGraph: "
const magicErrorStream = "errStream: "
const magicErrorInterpret = "errInterpret: "
const magicErrorAutoEdge = "errAutoEdge: "
const magicEmpty = "# empty!"
@@ -650,6 +651,7 @@ func TestAstFunc2(t *testing.T) {
failSetScope := false
failUnify := false
failGraph := false
failStream := false
failInterpret := false
failAutoEdge := false
if strings.HasPrefix(expstr, magicError) {
@@ -686,6 +688,11 @@ func TestAstFunc2(t *testing.T) {
expstr = errStr
failGraph = true
}
if strings.HasPrefix(expstr, magicErrorStream) {
errStr = strings.TrimPrefix(expstr, magicErrorStream)
expstr = errStr
failStream = true
}
if strings.HasPrefix(expstr, magicErrorInterpret) {
errStr = strings.TrimPrefix(expstr, magicErrorInterpret)
expstr = errStr
@@ -1124,8 +1131,28 @@ func TestAstFunc2(t *testing.T) {
return
}
if err != nil {
t.Errorf("test #%d: FAIL", index)
t.Errorf("test #%d: stream errored: %+v", index, err)
if (!fail || !failStream) && err != nil {
t.Errorf("test #%d: FAIL", index)
t.Errorf("test #%d: stream errored: %+v", index, err)
return
}
if failStream && err != nil {
t.Logf("test #%d: stream errored: %+v", index, err)
// Stream errors often have pointers in them, so don't compare for now.
//s := err.Error() // convert to string
//if s != expstr {
// t.Errorf("test #%d: FAIL", index)
// t.Errorf("test #%d: expected different error", index)
// t.Logf("test #%d: err: %s", index, s)
// t.Logf("test #%d: exp: %s", index, expstr)
//}
return
}
if failStream && err == nil {
t.Errorf("test #%d: FAIL", index)
t.Errorf("test #%d: stream passed, expected fail", index)
return
}
return
}
t.Logf("test #%d: got stream event!", index)