Fix comma-separated fields, fix emitted comment on unexported declarations

examples/globalconfig/index.ts

@@ -0,0 +1,8 @@
+// Code generated by tygo. DO NOT EDIT.
+
+//////////
+// source: globalconfig.go
+
+export interface Config {
+  Duration: number /* int, ns */;
+}

tygo.yaml

@@ -18,6 +18,8 @@ packages:
       export type Something = string | number;
   - path: "github.com/gzuidhof/tygo/examples/simple"
     fallback_type: unknown
+    type_mappings:
+      time.Time: "string /* RFC3339 */"
   - path: "github.com/gzuidhof/tygo/examples/inheritance"
     fallback_type: unknown
     frontmatter:

tygo/fixtures_test.go

@@ -78,7 +78,6 @@ func parseMarkdownFixtures(fileContents []byte) ([]MarkdownFixture, error) {
 	}
 
 	return fixtures, nil
-
 }
 
 // Tests all markdown files in `testdata/fixtures/` directory.

tygo/generator.go

@@ -72,7 +72,7 @@ func (g *Tygo) Generate() error {
 			return nil
 		}
 
-		err = os.WriteFile(outPath, []byte(code), 0664)
+		err = os.WriteFile(outPath, []byte(code), 0o664)
 		if err != nil {
 			return nil
 		}

tygo/package_generator.go

@@ -12,7 +12,6 @@ func (g *PackageGenerator) generateFile(s *strings.Builder, file *ast.File, file
 
 	ast.Inspect(file, func(n ast.Node) bool {
 		switch x := n.(type) {
-
 		// GenDecl can be an import, type, var, or const expression
 		case *ast.GenDecl:
 			if x.Tok == token.IMPORT {

tygo/testdata/fixtures/simple.md

@@ -69,8 +69,71 @@ Empty file
 Unexported
 
 ```go
+// A comment on an unexported constant
 const myValue = 3
+
+// A comment on an unexported type
+type myType struct {
+  // A comment on an unexported field
+  field string
+}
+
+// Mixed unexported and exported 
+const (
+  unexportedValue = 7 // A comment on an unexported constant
+  ExportedValue = 42 // A comment on an exported constant
+)
+
+// Unexported group
+const (
+  unexportedValue1 = 1 // A comment on an unexported constant
+  unexportedValue2 = 2 // Another comment on an unexported constant
+)
 ```
 
 ```ts
+/**
+ * Mixed unexported and exported
+ */
+export const ExportedValue = 42; // A comment on an exported constant
+```
+
+
+Comma
+
+```go
+type A struct {
+  Foo, Bar, baz string // A comment on fields separated by a comma
+}
+
+type B struct {
+  // A comment above the fields separated by a comma
+  Foo, Bar, baz string
+}
+
+
+```
+```ts
+export interface A {
+  Foo: string; // A comment on fields separated by a comma
+  Bar: string; // A comment on fields separated by a comma
+}
+export interface B {
+  /**
+   * A comment above the fields separated by a comma
+   */
+  Foo: string;
+  /**
+   * A comment above the fields separated by a comma
+   */
+  Bar: string;
+}
+```
+
+```go
+const Pi, E = 3.14, 2.71 // A comment on constants separated by a comma
+```
+```ts
+export const Pi = 3.14; // A comment on constants separated by a comma
+export const E = 2.71; // A comment on constants separated by a comma
 ```

tygo/write.go

@@ -12,10 +12,12 @@ import (
 	"github.com/fatih/structtag"
 )
 
-var validJSNameRegexp = regexp.MustCompile(`(?m)^[\pL_][\pL\pN_]*$`)
-var backquoteEscapeRegexp = regexp.MustCompile(`([$\\])`)
-var octalPrefixRegexp = regexp.MustCompile(`^0[0-7]`)
-var unicode8Regexp = regexp.MustCompile(`\\\\|\\U[\da-fA-F]{8}`)
+var (
+	validJSNameRegexp     = regexp.MustCompile(`(?m)^[\pL_][\pL\pN_]*$`)
+	backquoteEscapeRegexp = regexp.MustCompile(`([$\\])`)
+	octalPrefixRegexp     = regexp.MustCompile(`^0[0-7]`)
+	unicode8Regexp        = regexp.MustCompile(`\\\\|\\U[\da-fA-F]{8}`)
+)
 
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Operator_precedence#table
 var jsNumberOperatorPrecedence = map[token.Token]int{
@@ -292,110 +294,115 @@ func (g *PackageGenerator) writeStructFields(s *strings.Builder, fields []*ast.F
 		required := false
 		readonly := false
 
-		var fieldName string
+		fieldNames := make([]string, 0, len(f.Names))
 		if len(f.Names) == 0 { // anonymous field
 			if name, valid := getAnonymousFieldName(f.Type); valid {
-				fieldName = name
+				fieldNames = append(fieldNames, name)
+			}
+		} else {
+			for _, name := range f.Names {
+				if len(name.Name) == 0 || 'A' > name.Name[0] || name.Name[0] > 'Z' {
+					continue
+				}
+				fieldNames = append(fieldNames, name.Name)
 			}
-		}
-		if len(f.Names) != 0 && f.Names[0] != nil && len(f.Names[0].Name) != 0 {
-			fieldName = f.Names[0].Name
-		}
-		if len(fieldName) == 0 || 'A' > fieldName[0] || fieldName[0] > 'Z' {
-			continue
 		}
 
-		var name string
-		var tstype string
-		if f.Tag != nil {
-			tags, err := structtag.Parse(f.Tag.Value[1 : len(f.Tag.Value)-1])
-			if err != nil {
-				panic(err)
-			}
+		for _, fieldName := range fieldNames {
 
-			jsonTag, err := tags.Get("json")
-			if err == nil {
-				name = jsonTag.Name
-				if name == "-" {
-					continue
+			var name string
+			var tstype string
+			if f.Tag != nil {
+				tags, err := structtag.Parse(f.Tag.Value[1 : len(f.Tag.Value)-1])
+				if err != nil {
+					panic(err)
 				}
 
-				optional = jsonTag.HasOption("omitempty") || jsonTag.HasOption("omitzero")
-			}
-			yamlTag, err := tags.Get("yaml")
-			if err == nil {
-				name = yamlTag.Name
-				if name == "-" {
-					continue
+				jsonTag, err := tags.Get("json")
+				if err == nil {
+					name = jsonTag.Name
+					if name == "-" {
+						continue
+					}
+
+					optional = jsonTag.HasOption("omitempty") || jsonTag.HasOption("omitzero")
+				}
+				yamlTag, err := tags.Get("yaml")
+				if err == nil {
+					name = yamlTag.Name
+					if name == "-" {
+						continue
+					}
+
+					optional = yamlTag.HasOption("omitempty")
 				}
 
-				optional = yamlTag.HasOption("omitempty")
+				tstypeTag, err := tags.Get("tstype")
+				if err == nil {
+					tstype = tstypeTag.Name
+					if tstype == "-" || tstypeTag.HasOption("extends") {
+						continue
+					}
+					required = tstypeTag.HasOption("required")
+					readonly = tstypeTag.HasOption("readonly")
+				}
 			}
 
-			tstypeTag, err := tags.Get("tstype")
-			if err == nil {
-				tstype = tstypeTag.Name
-				if tstype == "-" || tstypeTag.HasOption("extends") {
-					continue
+			if len(name) == 0 {
+				if g.conf.Flavor == "yaml" {
+					name = strings.ToLower(fieldName)
+				} else {
+					name = fieldName
 				}
-				required = tstypeTag.HasOption("required")
-				readonly = tstypeTag.HasOption("readonly")
 			}
-		}
 
-		if len(name) == 0 {
-			if g.conf.Flavor == "yaml" {
-				name = strings.ToLower(fieldName)
-			} else {
-				name = fieldName
+			if g.PreserveTypeComments() {
+				g.writeCommentGroupIfNotNil(s, f.Doc, depth+1)
 			}
-		}
 
-		if g.PreserveTypeComments() {
-			g.writeCommentGroupIfNotNil(s, f.Doc, depth+1)
-		}
+			g.writeIndent(s, depth+1)
+			quoted := !validJSName(name)
+			if quoted {
+				s.WriteByte('\'')
+			}
+			if readonly {
+				s.WriteString("readonly ")
+			}
+			s.WriteString(name)
+			if quoted {
+				s.WriteByte('\'')
+			}
 
-		g.writeIndent(s, depth+1)
-		quoted := !validJSName(name)
-		if quoted {
-			s.WriteByte('\'')
-		}
-		if readonly {
-			s.WriteString("readonly ")
-		}
-		s.WriteString(name)
-		if quoted {
-			s.WriteByte('\'')
-		}
+			switch t := f.Type.(type) {
+			case *ast.StarExpr:
+				optional = !required
+				f.Type = t.X
+			}
 
-		switch t := f.Type.(type) {
-		case *ast.StarExpr:
-			optional = !required
-			f.Type = t.X
-		}
+			if optional && g.conf.OptionalType == "undefined" {
+				s.WriteByte('?')
+			}
 
-		if optional && g.conf.OptionalType == "undefined" {
-			s.WriteByte('?')
-		}
+			s.WriteString(": ")
 
-		s.WriteString(": ")
+			if tstype == "" {
+				g.writeType(s, f.Type, nil, depth, false)
+				if optional && g.conf.OptionalType == "null" {
+					s.WriteString(" | null")
+				}
+			} else {
+				s.WriteString(tstype)
+			}
+			s.WriteByte(';')
 
-		if tstype == "" {
-			g.writeType(s, f.Type, nil, depth, false)
-			if optional && g.conf.OptionalType == "null" {
-				s.WriteString(" | null")
+			if f.Comment != nil && g.PreserveTypeComments() {
+				// Line comment is present, that means a comment after the field.
+				s.WriteString(" // ")
+				s.WriteString(f.Comment.Text())
+			} else {
+				s.WriteByte('\n')
 			}
-		} else {
-			s.WriteString(tstype)
-		}
-		s.WriteByte(';')
 
-		if f.Comment != nil && g.PreserveTypeComments() {
-			// Line comment is present, that means a comment after the field.
-			s.WriteString(" // ")
-			s.WriteString(f.Comment.Text())
-		} else {
-			s.WriteByte('\n')
 		}
 
 	}

tygo/write_comment.go

@@ -5,10 +5,14 @@ import (
 	"strings"
 )
 
+// PreserveDocComments returns true if doc comments should be preserved.
+// These are comments that are not associated with a type or function, but rather
+// with the package or file itself.
 func (g *PackageGenerator) PreserveDocComments() bool {
 	return g.conf.PreserveComments == "default"
 }
 
+// PreserveTypeComments returns true if type comments should be preserved.
 func (g *PackageGenerator) PreserveTypeComments() bool {
 	return g.conf.PreserveComments == "types" || g.conf.PreserveComments == "default"
 }

tygo/write_toplevel.go

@@ -45,6 +45,7 @@ func (g *PackageGenerator) emitVar(s *strings.Builder, dec *ast.GenDecl) {
 	}
 	s.WriteString(v[1:len(v)-1] + "\n")
 }
+
 func (g *PackageGenerator) writeGroupDecl(s *strings.Builder, decl *ast.GenDecl) {
 	// This checks whether the declaration is a group declaration like:
 	// const (
@@ -53,6 +54,16 @@ func (g *PackageGenerator) writeGroupDecl(s *strings.Builder, decl *ast.GenDecl)
 	// )
 	isGroupedDeclaration := len(decl.Specs) > 1
 
+	// Check if decl is exported, if not, we exit early so we don't write its comment.
+	if !isGroupedDeclaration {
+		if ts, ok := decl.Specs[0].(*ast.TypeSpec); ok && !ts.Name.IsExported() {
+			return
+		}
+		if vs, ok := decl.Specs[0].(*ast.ValueSpec); ok && !vs.Names[0].IsExported() {
+			return
+		}
+	}
+
 	if !isGroupedDeclaration && g.PreserveTypeComments() {
 		g.writeCommentGroupIfNotNil(s, decl.Doc, 0)
 	}