decoder: Implement semantic tokens for TypeDeclaration

decoder/expr_type_declaration.go

@@ -1,9 +1,6 @@
 package decoder
 
 import (
-	"context"
-
-	"github.com/hashicorp/hcl-lang/lang"
 	"github.com/hashicorp/hcl-lang/schema"
 	"github.com/hashicorp/hcl/v2"
 )
@@ -18,11 +15,6 @@ type TypeDeclaration struct {
 	// TODO: optional attribute mode
 }
 
-func (td TypeDeclaration) SemanticTokens(ctx context.Context) []lang.SemanticToken {
-	// TODO
-	return nil
-}
-
 func isSingleArgTypeName(name string) bool {
 	return name == "list" || name == "set" || name == "map"
 }

decoder/expr_type_declaration_semtok.go

@@ -0,0 +1,129 @@
+package decoder
+
+import (
+	"context"
+
+	"github.com/hashicorp/hcl-lang/lang"
+	"github.com/hashicorp/hcl/v2/hclsyntax"
+)
+
+func (td TypeDeclaration) SemanticTokens(ctx context.Context) []lang.SemanticToken {
+	switch eType := td.expr.(type) {
+	case *hclsyntax.ScopeTraversalExpr:
+		if len(eType.Traversal) != 1 {
+			return []lang.SemanticToken{}
+		}
+
+		if isPrimitiveTypeDeclaration(eType.Traversal.RootName()) {
+			return []lang.SemanticToken{
+				{
+					Type:      lang.TokenTypePrimitive,
+					Modifiers: []lang.SemanticTokenModifier{},
+					Range:     eType.Range(),
+				},
+			}
+		}
+	case *hclsyntax.FunctionCallExpr:
+		if isSingleArgTypeName(eType.Name) {
+			tokens := make([]lang.SemanticToken, 0)
+
+			tokens = append(tokens, lang.SemanticToken{
+				Type:      lang.TokenTypeCapsule,
+				Modifiers: []lang.SemanticTokenModifier{},
+				Range:     eType.NameRange,
+			})
+
+			if len(eType.Args) == 0 {
+				return tokens
+			}
+
+			if len(eType.Args) == 1 {
+				cons := TypeDeclaration{
+					expr:    eType.Args[0],
+					pathCtx: td.pathCtx,
+				}
+				tokens = append(tokens, cons.SemanticTokens(ctx)...)
+
+				return tokens
+			}
+
+			return []lang.SemanticToken{}
+		}
+
+		if eType.Name == "object" {
+			tokens := make([]lang.SemanticToken, 0)
+			tokens = append(tokens, lang.SemanticToken{
+				Type:      lang.TokenTypeCapsule,
+				Modifiers: []lang.SemanticTokenModifier{},
+				Range:     eType.NameRange,
+			})
+
+			if len(eType.Args) == 0 {
+				return tokens
+			}
+
+			if len(eType.Args) == 1 {
+				objExpr, isObject := eType.Args[0].(*hclsyntax.ObjectConsExpr)
+				if !isObject {
+					return []lang.SemanticToken{}
+				}
+
+				cons := TypeDeclaration{
+					expr:         objExpr,
+					pathCtx:      td.pathCtx,
+					insideObject: true,
+				}
+
+				tokens = append(tokens, cons.SemanticTokens(ctx)...)
+
+				return tokens
+			}
+
+			return []lang.SemanticToken{}
+		}
+
+		// multi argument type (tuple)
+		if eType.Name == "tuple" {
+			tokens := make([]lang.SemanticToken, 0)
+			tokens = append(tokens, lang.SemanticToken{
+				Type:      lang.TokenTypeCapsule,
+				Modifiers: []lang.SemanticTokenModifier{},
+				Range:     eType.NameRange,
+			})
+
+			for _, expr := range eType.Args {
+				cons := TypeDeclaration{
+					expr:    expr,
+					pathCtx: td.pathCtx,
+				}
+				tokens = append(tokens, cons.SemanticTokens(ctx)...)
+			}
+
+			return tokens
+		}
+	case *hclsyntax.ObjectConsExpr:
+		if !td.insideObject {
+			// no tokens in bare object notation w/out object()
+			return []lang.SemanticToken{}
+		}
+
+		tokens := make([]lang.SemanticToken, 0)
+
+		for _, item := range eType.Items {
+			tokens = append(tokens, lang.SemanticToken{
+				Type:      lang.TokenAttrName,
+				Modifiers: []lang.SemanticTokenModifier{},
+				Range:     item.KeyExpr.Range(),
+			})
+
+			cons := TypeDeclaration{
+				expr:    item.ValueExpr,
+				pathCtx: td.pathCtx,
+			}
+			tokens = append(tokens, cons.SemanticTokens(ctx)...)
+		}
+
+		return tokens
+	}
+	return nil
+}