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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,19 @@ | ||
| package hcl | ||
|
|
||
| import ( | ||
| "github.com/tomwright/dasel/v3/parsing" | ||
| ) | ||
|
|
||
| const ( | ||
| // HCL represents the hcl2 file format. | ||
| HCL parsing.Format = "hcl" | ||
| ) | ||
|
|
||
| var _ parsing.Reader = (*hclReader)(nil) | ||
|
|
||
| //var _ parsing.Writer = (*hclWriter)(nil) | ||
|
|
||
| func init() { | ||
| parsing.RegisterReader(HCL, newHCLReader) | ||
| parsing.RegisterWriter(HCL, newHCLWriter) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,181 @@ | ||
| package hcl | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "github.com/hashicorp/hcl/v2" | ||
| "github.com/hashicorp/hcl/v2/gohcl" | ||
| "github.com/hashicorp/hcl/v2/hclsyntax" | ||
| "github.com/tomwright/dasel/v3/model" | ||
| "github.com/tomwright/dasel/v3/parsing" | ||
| "github.com/zclconf/go-cty/cty" | ||
| ) | ||
|
|
||
| func newHCLReader(options parsing.ReaderOptions) (parsing.Reader, error) { | ||
| return &hclReader{}, nil | ||
| } | ||
|
|
||
| type hclReader struct{} | ||
|
|
||
| // Read reads a value from a byte slice. | ||
| func (j *hclReader) Read(data []byte) (*model.Value, error) { | ||
| f, _ := hclsyntax.ParseConfig(data, "input", hcl.InitialPos) | ||
|
|
||
| body, ok := f.Body.(*hclsyntax.Body) | ||
| if !ok { | ||
| return nil, fmt.Errorf("failed to assert file body type") | ||
| } | ||
|
|
||
| return decodeHCLBody(body) | ||
| } | ||
|
|
||
| func decodeHCLBody(body *hclsyntax.Body) (*model.Value, error) { | ||
| res := model.NewMapValue() | ||
|
|
||
| for _, attr := range body.Attributes { | ||
| val, err := decodeHCLExpr(attr.Expr) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to decode attr %q: %w", attr.Name, err) | ||
| } | ||
|
|
||
| if err := res.SetMapKey(attr.Name, val); err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
|
|
||
| blockTypeIndexes := make(map[string]int) | ||
| blockValues := make([][]*model.Value, 0) | ||
| for _, block := range body.Blocks { | ||
| if _, ok := blockTypeIndexes[block.Type]; !ok { | ||
| blockValues = append(blockValues, make([]*model.Value, 0)) | ||
| blockTypeIndexes[block.Type] = len(blockValues) - 1 | ||
| } | ||
| res, err := decodeHCLBlock(block) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to decode block %q: %w", block.Type, err) | ||
| } | ||
| blockValues[blockTypeIndexes[block.Type]] = append(blockValues[blockTypeIndexes[block.Type]], res) | ||
| } | ||
|
|
||
| for t, index := range blockTypeIndexes { | ||
| blocks := blockValues[index] | ||
| switch len(blocks) { | ||
| case 0: | ||
| continue | ||
| case 1: | ||
| if err := res.SetMapKey(t, blocks[0]); err != nil { | ||
| return nil, err | ||
| } | ||
| default: | ||
| val := model.NewSliceValue() | ||
| for _, b := range blocks { | ||
| if err := val.Append(b); err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
| if err := res.SetMapKey(t, val); err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return res, nil | ||
| } | ||
|
|
||
| func decodeHCLBlock(block *hclsyntax.Block) (*model.Value, error) { | ||
| res, err := decodeHCLBody(block.Body) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| labels := model.NewSliceValue() | ||
| for _, l := range block.Labels { | ||
| if err := labels.Append(model.NewStringValue(l)); err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
|
|
||
| if err := res.SetMapKey("labels", labels); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| if err := res.SetMapKey("type", model.NewStringValue(block.Type)); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return res, nil | ||
| } | ||
|
|
||
| func decodeHCLExpr(expr hcl.Expression) (*model.Value, error) { | ||
| source := cty.Value{} | ||
| _ = gohcl.DecodeExpression(expr, nil, &source) | ||
|
|
||
| return decodeCtyValue(source) | ||
| } | ||
|
|
||
| func decodeCtyValue(source cty.Value) (res *model.Value, err error) { | ||
| defer func() { | ||
| r := recover() | ||
| if r != nil { | ||
| err = fmt.Errorf("failed to decode: %v", r) | ||
| return | ||
| } | ||
| }() | ||
| if source.IsNull() { | ||
| return model.NewNullValue(), nil | ||
| } | ||
|
|
||
| sourceT := source.Type() | ||
| switch { | ||
| case sourceT.IsMapType(): | ||
| return nil, fmt.Errorf("map type not implemented") | ||
| case sourceT.IsListType(): | ||
| return nil, fmt.Errorf("list type not implemented") | ||
| case sourceT.IsCollectionType(): | ||
| return nil, fmt.Errorf("collection type not implemented") | ||
| case sourceT.IsCapsuleType(): | ||
| return nil, fmt.Errorf("capsule type not implemented") | ||
| case sourceT.IsTupleType(): | ||
| res = model.NewSliceValue() | ||
| it := source.ElementIterator() | ||
| for it.Next() { | ||
| k, v := it.Element() | ||
| // We don't need the index as they should be in order. | ||
| // Just validates the key is correct. | ||
| _, _ = k.AsBigFloat().Float64() | ||
|
|
||
| val, err := decodeCtyValue(v) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to decode tuple value: %w", err) | ||
| } | ||
|
|
||
| if err := res.Append(val); err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
| return res, nil | ||
| case sourceT.IsObjectType(): | ||
| return nil, fmt.Errorf("object type not implemented") | ||
| case sourceT.IsPrimitiveType(): | ||
| switch sourceT { | ||
| case cty.String: | ||
| v := source.AsString() | ||
| return model.NewStringValue(v), nil | ||
| case cty.Bool: | ||
| v := source.True() | ||
| return model.NewBoolValue(v), nil | ||
| case cty.Number: | ||
| v := source.AsBigFloat() | ||
| f64, _ := v.Float64() | ||
| if v.IsInt() { | ||
| return model.NewIntValue(int64(f64)), nil | ||
| } | ||
| return model.NewFloatValue(f64), nil | ||
| default: | ||
| return nil, fmt.Errorf("unhandled primitive type %q", source.Type()) | ||
| } | ||
| case sourceT.IsSetType(): | ||
| return nil, fmt.Errorf("set type not implemented") | ||
| default: | ||
| return nil, fmt.Errorf("unhandled type: %s", sourceT.FriendlyName()) | ||
| } | ||
| } |
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