mirror of
https://gitea.com/Lydanne/buildx.git
synced 2025-11-04 18:13:42 +08:00
1ad87c6ba6
I needed "split" specifically so I can do something like:
```hcl
variable PLATFORMS {
default = "linux/amd64"
}
target foo {
platforms = split(",", "${PLATFORMS}")
# other stuff
}
```
Where the existing "csvdecode" does not work for this because it parses
the string into a list of objects instead of a list of strings.
I went ahead and just added all the available new functions.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
489 lines
13 KiB
Go
489 lines
13 KiB
Go
package convert
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import (
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"github.com/zclconf/go-cty/cty"
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)
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// conversionCollectionToList returns a conversion that will apply the given
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// conversion to all of the elements of a collection (something that supports
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// ForEachElement and LengthInt) and then returns the result as a list.
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//
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// "conv" can be nil if the elements are expected to already be of the
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// correct type and just need to be re-wrapped into a list. (For example,
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// if we're converting from a set into a list of the same element type.)
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func conversionCollectionToList(ety cty.Type, conv conversion) conversion {
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return func(val cty.Value, path cty.Path) (cty.Value, error) {
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elems := make([]cty.Value, 0, val.LengthInt())
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i := int64(0)
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elemPath := append(path.Copy(), nil)
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it := val.ElementIterator()
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for it.Next() {
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_, val := it.Element()
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var err error
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elemPath[len(elemPath)-1] = cty.IndexStep{
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Key: cty.NumberIntVal(i),
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}
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if conv != nil {
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val, err = conv(val, elemPath)
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if err != nil {
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return cty.NilVal, err
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}
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}
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elems = append(elems, val)
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i++
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}
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if len(elems) == 0 {
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if ety == cty.DynamicPseudoType {
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ety = val.Type().ElementType()
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}
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return cty.ListValEmpty(ety), nil
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}
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return cty.ListVal(elems), nil
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}
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}
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// conversionCollectionToSet returns a conversion that will apply the given
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// conversion to all of the elements of a collection (something that supports
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// ForEachElement and LengthInt) and then returns the result as a set.
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//
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// "conv" can be nil if the elements are expected to already be of the
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// correct type and just need to be re-wrapped into a set. (For example,
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// if we're converting from a list into a set of the same element type.)
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func conversionCollectionToSet(ety cty.Type, conv conversion) conversion {
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return func(val cty.Value, path cty.Path) (cty.Value, error) {
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elems := make([]cty.Value, 0, val.LengthInt())
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i := int64(0)
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elemPath := append(path.Copy(), nil)
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it := val.ElementIterator()
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for it.Next() {
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_, val := it.Element()
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var err error
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elemPath[len(elemPath)-1] = cty.IndexStep{
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Key: cty.NumberIntVal(i),
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}
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if conv != nil {
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val, err = conv(val, elemPath)
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if err != nil {
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return cty.NilVal, err
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}
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}
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elems = append(elems, val)
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i++
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}
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if len(elems) == 0 {
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// Prefer a concrete type over a dynamic type when returning an
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// empty set
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if ety == cty.DynamicPseudoType {
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ety = val.Type().ElementType()
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}
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return cty.SetValEmpty(ety), nil
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}
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return cty.SetVal(elems), nil
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}
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}
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// conversionCollectionToMap returns a conversion that will apply the given
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// conversion to all of the elements of a collection (something that supports
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// ForEachElement and LengthInt) and then returns the result as a map.
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//
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// "conv" can be nil if the elements are expected to already be of the
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// correct type and just need to be re-wrapped into a map.
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func conversionCollectionToMap(ety cty.Type, conv conversion) conversion {
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return func(val cty.Value, path cty.Path) (cty.Value, error) {
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elems := make(map[string]cty.Value, 0)
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elemPath := append(path.Copy(), nil)
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it := val.ElementIterator()
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for it.Next() {
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key, val := it.Element()
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var err error
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elemPath[len(elemPath)-1] = cty.IndexStep{
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Key: key,
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}
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keyStr, err := Convert(key, cty.String)
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if err != nil {
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// Should never happen, because keys can only be numbers or
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// strings and both can convert to string.
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return cty.DynamicVal, elemPath.NewErrorf("cannot convert key type %s to string for map", key.Type().FriendlyName())
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}
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if conv != nil {
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val, err = conv(val, elemPath)
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if err != nil {
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return cty.NilVal, err
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}
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}
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elems[keyStr.AsString()] = val
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}
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if len(elems) == 0 {
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// Prefer a concrete type over a dynamic type when returning an
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// empty map
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if ety == cty.DynamicPseudoType {
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ety = val.Type().ElementType()
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}
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return cty.MapValEmpty(ety), nil
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}
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if ety.IsCollectionType() || ety.IsObjectType() {
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var err error
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if elems, err = conversionUnifyCollectionElements(elems, path, false); err != nil {
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return cty.NilVal, err
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}
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}
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if err := conversionCheckMapElementTypes(elems, path); err != nil {
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return cty.NilVal, err
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}
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return cty.MapVal(elems), nil
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}
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}
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// conversionTupleToSet returns a conversion that will take a value of the
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// given tuple type and return a set of the given element type.
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//
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// Will panic if the given tupleType isn't actually a tuple type.
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func conversionTupleToSet(tupleType cty.Type, listEty cty.Type, unsafe bool) conversion {
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tupleEtys := tupleType.TupleElementTypes()
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if len(tupleEtys) == 0 {
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// Empty tuple short-circuit
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return func(val cty.Value, path cty.Path) (cty.Value, error) {
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return cty.SetValEmpty(listEty), nil
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}
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}
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if listEty == cty.DynamicPseudoType {
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// This is a special case where the caller wants us to find
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// a suitable single type that all elements can convert to, if
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// possible.
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listEty, _ = unify(tupleEtys, unsafe)
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if listEty == cty.NilType {
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return nil
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}
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}
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elemConvs := make([]conversion, len(tupleEtys))
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for i, tupleEty := range tupleEtys {
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if tupleEty.Equals(listEty) {
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// no conversion required
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continue
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}
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elemConvs[i] = getConversion(tupleEty, listEty, unsafe)
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if elemConvs[i] == nil {
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// If any of our element conversions are impossible, then the our
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// whole conversion is impossible.
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return nil
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}
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}
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// If we fall out here then a conversion is possible, using the
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// element conversions in elemConvs
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return func(val cty.Value, path cty.Path) (cty.Value, error) {
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elems := make([]cty.Value, 0, len(elemConvs))
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elemPath := append(path.Copy(), nil)
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i := int64(0)
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it := val.ElementIterator()
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for it.Next() {
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_, val := it.Element()
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var err error
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elemPath[len(elemPath)-1] = cty.IndexStep{
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Key: cty.NumberIntVal(i),
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}
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conv := elemConvs[i]
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if conv != nil {
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val, err = conv(val, elemPath)
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if err != nil {
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return cty.NilVal, err
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}
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}
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elems = append(elems, val)
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i++
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}
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return cty.SetVal(elems), nil
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}
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}
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// conversionTupleToList returns a conversion that will take a value of the
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// given tuple type and return a list of the given element type.
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//
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// Will panic if the given tupleType isn't actually a tuple type.
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func conversionTupleToList(tupleType cty.Type, listEty cty.Type, unsafe bool) conversion {
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tupleEtys := tupleType.TupleElementTypes()
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if len(tupleEtys) == 0 {
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// Empty tuple short-circuit
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return func(val cty.Value, path cty.Path) (cty.Value, error) {
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return cty.ListValEmpty(listEty), nil
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}
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}
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if listEty == cty.DynamicPseudoType {
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// This is a special case where the caller wants us to find
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// a suitable single type that all elements can convert to, if
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// possible.
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listEty, _ = unify(tupleEtys, unsafe)
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if listEty == cty.NilType {
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return nil
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}
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}
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elemConvs := make([]conversion, len(tupleEtys))
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for i, tupleEty := range tupleEtys {
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if tupleEty.Equals(listEty) {
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// no conversion required
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continue
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}
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elemConvs[i] = getConversion(tupleEty, listEty, unsafe)
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if elemConvs[i] == nil {
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// If any of our element conversions are impossible, then the our
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// whole conversion is impossible.
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return nil
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}
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}
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// If we fall out here then a conversion is possible, using the
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// element conversions in elemConvs
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return func(val cty.Value, path cty.Path) (cty.Value, error) {
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elems := make([]cty.Value, 0, len(elemConvs))
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elemPath := append(path.Copy(), nil)
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i := int64(0)
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it := val.ElementIterator()
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for it.Next() {
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_, val := it.Element()
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var err error
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elemPath[len(elemPath)-1] = cty.IndexStep{
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Key: cty.NumberIntVal(i),
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}
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conv := elemConvs[i]
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if conv != nil {
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val, err = conv(val, elemPath)
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if err != nil {
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return cty.NilVal, err
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}
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}
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elems = append(elems, val)
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i++
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}
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return cty.ListVal(elems), nil
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}
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}
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// conversionObjectToMap returns a conversion that will take a value of the
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// given object type and return a map of the given element type.
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//
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// Will panic if the given objectType isn't actually an object type.
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func conversionObjectToMap(objectType cty.Type, mapEty cty.Type, unsafe bool) conversion {
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objectAtys := objectType.AttributeTypes()
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if len(objectAtys) == 0 {
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// Empty object short-circuit
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return func(val cty.Value, path cty.Path) (cty.Value, error) {
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return cty.MapValEmpty(mapEty), nil
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}
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}
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if mapEty == cty.DynamicPseudoType {
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// This is a special case where the caller wants us to find
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// a suitable single type that all elements can convert to, if
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// possible.
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objectAtysList := make([]cty.Type, 0, len(objectAtys))
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for _, aty := range objectAtys {
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objectAtysList = append(objectAtysList, aty)
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}
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mapEty, _ = unify(objectAtysList, unsafe)
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if mapEty == cty.NilType {
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return nil
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}
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}
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elemConvs := make(map[string]conversion, len(objectAtys))
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for name, objectAty := range objectAtys {
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if objectAty.Equals(mapEty) {
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// no conversion required
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continue
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}
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elemConvs[name] = getConversion(objectAty, mapEty, unsafe)
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if elemConvs[name] == nil {
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// If any of our element conversions are impossible, then the our
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// whole conversion is impossible.
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return nil
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}
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}
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// If we fall out here then a conversion is possible, using the
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// element conversions in elemConvs
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return func(val cty.Value, path cty.Path) (cty.Value, error) {
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elems := make(map[string]cty.Value, len(elemConvs))
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elemPath := append(path.Copy(), nil)
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it := val.ElementIterator()
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for it.Next() {
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name, val := it.Element()
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var err error
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elemPath[len(elemPath)-1] = cty.IndexStep{
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Key: name,
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}
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conv := elemConvs[name.AsString()]
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if conv != nil {
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val, err = conv(val, elemPath)
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if err != nil {
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return cty.NilVal, err
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}
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}
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elems[name.AsString()] = val
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}
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if mapEty.IsCollectionType() || mapEty.IsObjectType() {
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var err error
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if elems, err = conversionUnifyCollectionElements(elems, path, unsafe); err != nil {
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return cty.NilVal, err
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}
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}
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if err := conversionCheckMapElementTypes(elems, path); err != nil {
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return cty.NilVal, err
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}
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return cty.MapVal(elems), nil
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}
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}
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// conversionMapToObject returns a conversion that will take a value of the
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// given map type and return an object of the given type. The object attribute
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// types must all be compatible with the map element type.
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//
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// Will panic if the given mapType and objType are not maps and objects
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// respectively.
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func conversionMapToObject(mapType cty.Type, objType cty.Type, unsafe bool) conversion {
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objectAtys := objType.AttributeTypes()
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mapEty := mapType.ElementType()
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elemConvs := make(map[string]conversion, len(objectAtys))
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for name, objectAty := range objectAtys {
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if objectAty.Equals(mapEty) {
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// no conversion required
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continue
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}
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elemConvs[name] = getConversion(mapEty, objectAty, unsafe)
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if elemConvs[name] == nil {
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// If any of our element conversions are impossible, then the our
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// whole conversion is impossible.
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return nil
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}
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}
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// If we fall out here then a conversion is possible, using the
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// element conversions in elemConvs
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return func(val cty.Value, path cty.Path) (cty.Value, error) {
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elems := make(map[string]cty.Value, len(elemConvs))
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elemPath := append(path.Copy(), nil)
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it := val.ElementIterator()
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for it.Next() {
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name, val := it.Element()
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// if there is no corresponding attribute, we skip this key
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if _, ok := objectAtys[name.AsString()]; !ok {
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continue
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}
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var err error
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elemPath[len(elemPath)-1] = cty.IndexStep{
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Key: name,
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}
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conv := elemConvs[name.AsString()]
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if conv != nil {
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val, err = conv(val, elemPath)
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if err != nil {
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return cty.NilVal, err
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}
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}
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elems[name.AsString()] = val
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}
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return cty.ObjectVal(elems), nil
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}
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}
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func conversionUnifyCollectionElements(elems map[string]cty.Value, path cty.Path, unsafe bool) (map[string]cty.Value, error) {
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elemTypes := make([]cty.Type, 0, len(elems))
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for _, elem := range elems {
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elemTypes = append(elemTypes, elem.Type())
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}
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unifiedType, _ := unify(elemTypes, unsafe)
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if unifiedType == cty.NilType {
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}
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unifiedElems := make(map[string]cty.Value)
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elemPath := append(path.Copy(), nil)
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for name, elem := range elems {
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if elem.Type().Equals(unifiedType) {
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unifiedElems[name] = elem
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continue
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}
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conv := getConversion(elem.Type(), unifiedType, unsafe)
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if conv == nil {
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}
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elemPath[len(elemPath)-1] = cty.IndexStep{
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Key: cty.StringVal(name),
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}
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val, err := conv(elem, elemPath)
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if err != nil {
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return nil, err
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}
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unifiedElems[name] = val
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}
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return unifiedElems, nil
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}
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func conversionCheckMapElementTypes(elems map[string]cty.Value, path cty.Path) error {
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elementType := cty.NilType
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elemPath := append(path.Copy(), nil)
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for name, elem := range elems {
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if elementType == cty.NilType {
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elementType = elem.Type()
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continue
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}
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if !elementType.Equals(elem.Type()) {
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elemPath[len(elemPath)-1] = cty.IndexStep{
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Key: cty.StringVal(name),
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}
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return elemPath.NewErrorf("%s is required", elementType.FriendlyName())
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}
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}
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return nil
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}
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