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match_annotation_expects_kwarg.go
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match_annotation_expects_kwarg.go
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package overlay
import (
"fmt"
"strconv"
"strings"
"go.starlark.net/starlark"
)
type MatchAnnotationExpectsKwarg struct {
expects *starlark.Value
missingOK *starlark.Value
thread *starlark.Thread
}
func (a *MatchAnnotationExpectsKwarg) FillInDefaults(defaults MatchChildDefaultsAnnotation) {
if a.expects == nil {
a.expects = defaults.expects.expects
}
if a.missingOK == nil {
a.missingOK = defaults.expects.missingOK
}
}
func (a MatchAnnotationExpectsKwarg) Check(num int) error {
switch {
case a.missingOK != nil && a.expects != nil:
return fmt.Errorf("Expected only one of keyword arguments ('missing_ok', 'expects') specified")
case a.missingOK != nil:
if typedResult, ok := (*a.missingOK).(starlark.Bool); ok {
if typedResult {
allowedVals := []starlark.Value{starlark.MakeInt(0), starlark.MakeInt(1)}
return a.checkValue(starlark.NewList(allowedVals), num)
}
return a.checkValue(starlark.MakeInt(1), num)
}
return fmt.Errorf("Expected keyword argument 'missing_ok' to be a boolean")
case a.expects != nil:
return a.checkValue(*a.expects, num)
default:
return a.checkValue(starlark.MakeInt(1), num)
}
}
func (a MatchAnnotationExpectsKwarg) checkValue(val interface{}, num int) error {
switch typedVal := val.(type) {
case starlark.Int:
return a.checkInt(typedVal, num)
case starlark.String:
return a.checkString(typedVal, num)
case *starlark.List:
return a.checkList(typedVal, num)
case starlark.Callable:
result, err := starlark.Call(a.thread, typedVal, starlark.Tuple{starlark.MakeInt(num)}, []starlark.Tuple{})
if err != nil {
return err
}
if typedResult, ok := result.(starlark.Bool); ok {
if !bool(typedResult) {
return fmt.Errorf("Expectation of number of matched nodes failed")
}
return nil
}
return fmt.Errorf("Expected keyword argument 'expects' to have a function that returns a boolean")
default:
return fmt.Errorf("Expected '%s' annotation keyword argument 'expects'"+
" to be either int, string or function, but was %T", AnnotationMatch, typedVal)
}
}
func (a MatchAnnotationExpectsKwarg) checkInt(typedVal starlark.Int, num int) error {
i1, ok := typedVal.Int64()
if ok {
if i1 != int64(num) {
return fmt.Errorf("Expected number of matched nodes to be %d, but was %d", i1, num)
}
return nil
}
i2, ok := typedVal.Uint64()
if ok {
if i2 != uint64(num) {
return fmt.Errorf("Expected number of matched nodes to be %d, but was %d", i2, num)
}
return nil
}
panic("Unsure how to convert starlark.Int to int")
}
func (a MatchAnnotationExpectsKwarg) checkString(typedVal starlark.String, num int) error {
typedValStr := string(typedVal)
if strings.HasSuffix(typedValStr, "+") {
typedInt, err := strconv.Atoi(strings.TrimSuffix(typedValStr, "+"))
if err != nil {
return fmt.Errorf("Expected '%s' to be in format 'i+' where i is an integer", typedValStr)
}
if num < typedInt {
return fmt.Errorf("Expected number of matched nodes to be >= %d, but was %d", typedInt, num)
}
return nil
}
return fmt.Errorf("Expected '%s' to be in format 'i+' where i is an integer", typedValStr)
}
func (a MatchAnnotationExpectsKwarg) checkList(typedVal *starlark.List, num int) error {
var lastErr error
var val starlark.Value
iter := typedVal.Iterate()
defer iter.Done()
for iter.Next(&val) {
lastErr = a.checkValue(val, num)
if lastErr == nil {
return nil
}
}
return lastErr
}