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Keep a read's null with its draw, share the lone-reference check, name a JSON-string item's object form again, prove each column once per pass, and read a record off template.record
Tests / vet + fmt + tests (pull_request) Successful in 1m3s
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Lilleman auf Larv
2026-09-15 20:42:13 +02:00
parent 04a75f7ded
commit b4ebab5abf
11 changed files with 129 additions and 99 deletions
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datatype.go
+12 -13
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@@ -94,7 +94,7 @@ func columnDatatype(n node) (DataType, error) {
return first, nil
}
// itemDatatype is the datatype a column item declares, else that of the column it reads whole.
// itemDatatype is the datatype a column item declares, else that of the column it is.
func itemDatatype(t *template) DataType {
if t.datatype != DataTypeString {
return t.datatype
@@ -102,17 +102,20 @@ func itemDatatype(t *template) DataType {
return readDatatype(t)
}
// readDatatype is the datatype of the column t reads whole; a string when it reads none.
// readDatatype is the datatype of the column t is, reading it by one reference alone; a string
// when t reads none.
func readDatatype(t *template) DataType {
if t.inherits == nil {
if t.readsColumn == nil {
return DataTypeString
}
d, _ := columnDatatype(t.inherits) // checkColumns refuses that column where it sits
return d
items, _ := columnItems(t.readsColumn.column)
if len(items) == 0 {
return DataTypeString
}
return itemDatatype(items[0]) // checkColumns refuses that column where its items disagree
}
// columnItems is a column's template items, its choices unwrapped, and whether one is null
// or reads whole a column that can be.
// columnItems is a column's template items, its choices unwrapped, and whether one is null.
func columnItems(n node) (items []*template, nullable bool) {
var collect func(node)
collect = func(n node) {
@@ -123,10 +126,6 @@ func columnItems(n node) (items []*template, nullable bool) {
}
case *template:
items = append(items, n)
if n.inherits != nil {
_, inherited := columnItems(n.inherits)
nullable = nullable || inherited
}
case *null:
nullable = true
}
@@ -143,8 +142,8 @@ func disagreement(a *template, da DataType, b *template, db DataType) error {
}
switch {
case da != DataTypeString && db != DataTypeString:
return fmt.Errorf("its items declare %s and %s; a column holds one datatype", da, db)
case bare.fields == nil: // a JSON string; an object, which may carry a weight, has a fields map
return fmt.Errorf("its items hold %s and %s; a column holds one datatype", da, db)
case bare.fromString: // an object may carry a weight, which this spelling would drop
return fmt.Errorf(`item %q declares no datatype, and a column holds one; write it as {"format":%q,"datatype":%q}`, bare.format, bare.format, want)
}
return fmt.Errorf(`item %q declares no datatype beside one declaring %s; a column holds one, so give it "datatype": %q`, bare.format, want, want)