feat: rewrite all logic to single loop ast.Decl (wip)

internal/imports/formatter.go

@@ -9,7 +9,6 @@ import (
 	"log"
 	"os"
 	"path/filepath"
-	"sort"
 	"strings"
 	"sync"
 
@@ -126,35 +125,23 @@ func (ft *Formatter) formatFile(path string) error {
 		return fmt.Errorf("os: failed to read file: [%s] %w", path, err)
 	}
 
-	// Parse ast
+	// Get module name of path
-	pathASTFile, err := ft.wrapParseAST(path, pathBytes)
-	if err != nil {
-		return err
-	}
-
-	// Parse imports
-	importsAST, err := ft.parseImportsAndCombine(pathASTFile)
-	if err != nil {
-		return err
-	}
-
-	// Return if empty imports
-	if len(importsAST) == 0 {
-		return nil
-	}
-	ft.log("formatFile: importsAST: %+v\n", importsAST)
-
 	moduleName, err := ft.moduleName(path)
 	if err != nil {
 		return err
 	}
 	ft.log("formatFile: moduleName: %+v\n", moduleName)
 
-	groupImports, err := ft.groupImports(importsAST, moduleName)
+	// Parse ast
+	pathASTFile, err := ft.parseAST(path, pathBytes)
 	if err != nil {
 		return err
 	}
-	ft.log("formatFile: groupImports: %+v\n", groupImports)
+	ft.log("formatFile: pathASTFile: %+v\n", pathASTFile)
+
+	if err := ft.formatASTFile(pathASTFile, moduleName); err != nil {
+		return err
+	}
 
 	ft.muFormattedPaths.Lock()
 	ft.formattedPaths[path] = struct{}{}
@@ -163,7 +150,7 @@ func (ft *Formatter) formatFile(path string) error {
 	return nil
 }
 
-func (ft *Formatter) wrapParseAST(path string, pathBytes []byte) (*ast.File, error) {
+func (ft *Formatter) parseAST(path string, pathBytes []byte) (*ast.File, error) {
 	fset := token.NewFileSet()
 
 	parserMode := parser.Mode(0)
@@ -185,27 +172,28 @@ func (ft *Formatter) wrapParseAST(path string, pathBytes []byte) (*ast.File, err
 // Copy from goimports-reviser
 // If exist multi import, combine them into one
 // This func will edit pathASTFile directly to combine
-func (ft *Formatter) parseImportsAndCombine(pathASTFile *ast.File) (map[string]*ast.ImportSpec, error) {
+func (ft *Formatter) formatASTFile(
-	result := make(map[string]*ast.ImportSpec)
+	pathASTFile *ast.File,
-
+	moduleName string,
+) error {
 	// Extract imports
 	importSpecs := make([]ast.Spec, 0, len(pathASTFile.Imports))
 	for _, importSpec := range pathASTFile.Imports {
 		ft.log("parseImportsAndCombine: importSpec: %+v %+v\n", importSpec.Name.String(), importSpec.Path.Value)
 		importSpecs = append(importSpecs, importSpec)
-
-		var importNameAndPath string
-		if importSpec.Name != nil {
-			// Handle alias import
-			// xyz "github.com/abc/xyz/123"
-			importNameAndPath = importSpec.Name.String() + " " + importSpec.Path.Value
-		} else {
-			// Handle normal import
-			// "github.com/abc/xyz"
-			importNameAndPath = importSpec.Path.Value
 	}
 
-		result[importNameAndPath] = importSpec
+	groupedImportSpecs, err := ft.groupImportSpecs(importSpecs, moduleName)
+	if err != nil {
+		return err
+	}
+
+	formattedImportSpecs, err := ft.formatImportSpecs(
+		importSpecs,
+		groupedImportSpecs,
+	)
+	if err != nil {
+		return err
 	}
 
 	// Combine multi import decl
@@ -236,7 +224,7 @@ func (ft *Formatter) parseImportsAndCombine(pathASTFile *ast.File) (map[string]*
 
 		// First import decl take all
 		isExistFirstImportDecl = true
-		genDecl.Specs = importSpecs
+		genDecl.Specs = formattedImportSpecs
 		decls = append(decls, genDecl)
 	}
 	ft.log("parseImportsAndCombine: decls: %+v\n", decls)
@@ -245,44 +233,49 @@ func (ft *Formatter) parseImportsAndCombine(pathASTFile *ast.File) (map[string]*
 		pathASTFile.Decls = decls
 	}
 
-	return result, nil
+	return nil
 }
 
 // Copy from goimports-reviser
 // Group imports to std, third-party, company if exist, local
-func (ft *Formatter) groupImports(
+func (ft *Formatter) groupImportSpecs(
-	importsAST map[string]*ast.ImportSpec,
+	importSpecs []ast.Spec,
 	moduleName string,
-) (map[string][]string, error) {
+) (map[string][]*ast.ImportSpec, error) {
-	result := make(map[string][]string)
+	result := make(map[string][]*ast.ImportSpec)
-	result[stdImport] = make([]string, 0, 8)
+	result[stdImport] = make([]*ast.ImportSpec, 0, 8)
-	result[thirdPartyImport] = make([]string, 0, 8)
+	result[thirdPartyImport] = make([]*ast.ImportSpec, 0, 8)
 	if ft.companyPrefix != "" {
-		result[companyImport] = make([]string, 0, 8)
+		result[companyImport] = make([]*ast.ImportSpec, 0, 8)
+	}
+	result[localImport] = make([]*ast.ImportSpec, 0, 8)
+
+	for _, importSpec := range importSpecs {
+		importSpec, ok := importSpec.(*ast.ImportSpec)
+		if !ok {
+			continue
 		}
-	result[localImport] = make([]string, 0, 8)
 
-	for importNameAndPath, importAST := range importsAST {
 		// "github.com/abc/xyz" -> github.com/abc/xyz
-		importPath := strings.Trim(importAST.Path.Value, "\"")
+		importPath := strings.Trim(importSpec.Path.Value, "\"")
 
 		if _, ok := ft.stdPackages[importPath]; ok {
-			result[stdImport] = append(result[stdImport], importNameAndPath)
+			result[stdImport] = append(result[stdImport], importSpec)
 			continue
 		}
 
 		if strings.HasPrefix(importPath, moduleName) {
-			result[localImport] = append(result[localImport], importNameAndPath)
+			result[localImport] = append(result[localImport], importSpec)
 			continue
 		}
 
 		if ft.companyPrefix != "" &&
 			strings.HasPrefix(importPath, ft.companyPrefix) {
-			result[companyImport] = append(result[companyImport], importNameAndPath)
+			result[companyImport] = append(result[companyImport], importSpec)
 			continue
 		}
 
-		result[thirdPartyImport] = append(result[thirdPartyImport], importNameAndPath)
+		result[thirdPartyImport] = append(result[thirdPartyImport], importSpec)
 	}
 
 	ft.log("groupImports: std: %+v\n", result[stdImport])
@@ -292,13 +285,67 @@ func (ft *Formatter) groupImports(
 	}
 	ft.log("groupImports: local: %+v\n", result[localImport])
 
-	// TODO: not sure if this match gofumpt output, but at lease it is sorted
+	return result, nil
-	sort.Strings(result[stdImport])
+}
-	sort.Strings(result[thirdPartyImport])
+
-	if ft.companyPrefix != "" {
+func (ft *Formatter) formatImportSpecs(
-		sort.Strings(result[companyImport])
+	importSpecs []ast.Spec,
+	groupedImportSpecs map[string][]*ast.ImportSpec,
+) ([]ast.Spec, error) {
+	result := make([]ast.Spec, 0, len(importSpecs))
+
+	if stdImportSpecs, ok := groupedImportSpecs[stdImport]; ok && len(stdImportSpecs) != 0 {
+		for _, importSpec := range stdImportSpecs {
+			result = append(result, importSpec)
+		}
+	}
+
+	if thirdPartImportSpecs, ok := groupedImportSpecs[thirdPartyImport]; ok && len(thirdPartImportSpecs) != 0 {
+		if len(result) != 0 {
+			result = append(result, &ast.ImportSpec{
+				Path: &ast.BasicLit{
+					Value: "",
+					Kind:  token.STRING,
+				},
+			})
+		}
+
+		for _, importSpec := range thirdPartImportSpecs {
+			result = append(result, importSpec)
+		}
+	}
+
+	if ft.companyPrefix != "" {
+		if companyImportSpecs, ok := groupedImportSpecs[companyImport]; ok && len(companyImportSpecs) != 0 {
+			if len(result) != 0 {
+				result = append(result, &ast.ImportSpec{
+					Path: &ast.BasicLit{
+						Value: "",
+						Kind:  token.STRING,
+					},
+				})
+			}
+
+			for _, importSpec := range companyImportSpecs {
+				result = append(result, importSpec)
+			}
+		}
+	}
+
+	if localImportSpecs, ok := groupedImportSpecs[localImport]; ok && len(localImportSpecs) != 0 {
+		if len(result) != 0 {
+			result = append(result, &ast.ImportSpec{
+				Path: &ast.BasicLit{
+					Value: "",
+					Kind:  token.STRING,
+				},
+			})
+		}
+
+		for _, importSpec := range localImportSpecs {
+			result = append(result, importSpec)
+		}
 	}
-	sort.Strings(result[localImport])
 
 	return result, nil
 }