645 lines
18 KiB
Go
645 lines
18 KiB
Go
// Copyright 2012 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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// This file contains the model construction by parsing source files.
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import (
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"errors"
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"flag"
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"fmt"
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"go/ast"
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"go/build"
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"go/importer"
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"go/parser"
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"go/token"
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"go/types"
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"io/ioutil"
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"log"
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"path"
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"path/filepath"
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"strconv"
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"strings"
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"github.com/golang/mock/mockgen/model"
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)
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var (
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imports = flag.String("imports", "", "(source mode) Comma-separated name=path pairs of explicit imports to use.")
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auxFiles = flag.String("aux_files", "", "(source mode) Comma-separated pkg=path pairs of auxiliary Go source files.")
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)
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// sourceMode generates mocks via source file.
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func sourceMode(source string) (*model.Package, error) {
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srcDir, err := filepath.Abs(filepath.Dir(source))
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if err != nil {
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return nil, fmt.Errorf("failed getting source directory: %v", err)
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}
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packageImport, err := parsePackageImport(srcDir)
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if err != nil {
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return nil, err
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}
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fs := token.NewFileSet()
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file, err := parser.ParseFile(fs, source, nil, 0)
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if err != nil {
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return nil, fmt.Errorf("failed parsing source file %v: %v", source, err)
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}
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p := &fileParser{
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fileSet: fs,
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imports: make(map[string]importedPackage),
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importedInterfaces: make(map[string]map[string]*ast.InterfaceType),
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auxInterfaces: make(map[string]map[string]*ast.InterfaceType),
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srcDir: srcDir,
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}
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// Handle -imports.
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dotImports := make(map[string]bool)
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if *imports != "" {
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for _, kv := range strings.Split(*imports, ",") {
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eq := strings.Index(kv, "=")
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k, v := kv[:eq], kv[eq+1:]
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if k == "." {
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dotImports[v] = true
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} else {
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p.imports[k] = importedPkg{path: v}
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}
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}
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}
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// Handle -aux_files.
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if err := p.parseAuxFiles(*auxFiles); err != nil {
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return nil, err
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}
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p.addAuxInterfacesFromFile(packageImport, file) // this file
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pkg, err := p.parseFile(packageImport, file)
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if err != nil {
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return nil, err
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}
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for pkgPath := range dotImports {
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pkg.DotImports = append(pkg.DotImports, pkgPath)
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}
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return pkg, nil
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}
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type importedPackage interface {
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Path() string
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Parser() *fileParser
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}
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type importedPkg struct {
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path string
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parser *fileParser
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}
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func (i importedPkg) Path() string { return i.path }
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func (i importedPkg) Parser() *fileParser { return i.parser }
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// duplicateImport is a bit of a misnomer. Currently the parser can't
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// handle cases of multi-file packages importing different packages
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// under the same name. Often these imports would not be problematic,
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// so this type lets us defer raising an error unless the package name
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// is actually used.
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type duplicateImport struct {
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name string
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duplicates []string
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}
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func (d duplicateImport) Error() string {
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return fmt.Sprintf("%q is ambiguous because of duplicate imports: %v", d.name, d.duplicates)
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}
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func (d duplicateImport) Path() string { log.Fatal(d.Error()); return "" }
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func (d duplicateImport) Parser() *fileParser { log.Fatal(d.Error()); return nil }
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type fileParser struct {
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fileSet *token.FileSet
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imports map[string]importedPackage // package name => imported package
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importedInterfaces map[string]map[string]*ast.InterfaceType // package (or "") => name => interface
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auxFiles []*ast.File
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auxInterfaces map[string]map[string]*ast.InterfaceType // package (or "") => name => interface
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srcDir string
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}
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func (p *fileParser) errorf(pos token.Pos, format string, args ...interface{}) error {
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ps := p.fileSet.Position(pos)
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format = "%s:%d:%d: " + format
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args = append([]interface{}{ps.Filename, ps.Line, ps.Column}, args...)
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return fmt.Errorf(format, args...)
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}
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func (p *fileParser) parseAuxFiles(auxFiles string) error {
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auxFiles = strings.TrimSpace(auxFiles)
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if auxFiles == "" {
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return nil
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}
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for _, kv := range strings.Split(auxFiles, ",") {
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parts := strings.SplitN(kv, "=", 2)
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if len(parts) != 2 {
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return fmt.Errorf("bad aux file spec: %v", kv)
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}
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pkg, fpath := parts[0], parts[1]
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file, err := parser.ParseFile(p.fileSet, fpath, nil, 0)
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if err != nil {
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return err
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}
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p.auxFiles = append(p.auxFiles, file)
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p.addAuxInterfacesFromFile(pkg, file)
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}
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return nil
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}
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func (p *fileParser) addAuxInterfacesFromFile(pkg string, file *ast.File) {
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if _, ok := p.auxInterfaces[pkg]; !ok {
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p.auxInterfaces[pkg] = make(map[string]*ast.InterfaceType)
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}
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for ni := range iterInterfaces(file) {
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p.auxInterfaces[pkg][ni.name.Name] = ni.it
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}
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}
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// parseFile loads all file imports and auxiliary files import into the
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// fileParser, parses all file interfaces and returns package model.
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func (p *fileParser) parseFile(importPath string, file *ast.File) (*model.Package, error) {
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allImports, dotImports := importsOfFile(file)
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// Don't stomp imports provided by -imports. Those should take precedence.
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for pkg, pkgI := range allImports {
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if _, ok := p.imports[pkg]; !ok {
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p.imports[pkg] = pkgI
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}
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}
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// Add imports from auxiliary files, which might be needed for embedded interfaces.
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// Don't stomp any other imports.
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for _, f := range p.auxFiles {
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auxImports, _ := importsOfFile(f)
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for pkg, pkgI := range auxImports {
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if _, ok := p.imports[pkg]; !ok {
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p.imports[pkg] = pkgI
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}
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}
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}
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var is []*model.Interface
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for ni := range iterInterfaces(file) {
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i, err := p.parseInterface(ni.name.String(), importPath, ni.it)
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if err != nil {
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return nil, err
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}
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is = append(is, i)
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}
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return &model.Package{
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Name: file.Name.String(),
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PkgPath: importPath,
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Interfaces: is,
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DotImports: dotImports,
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}, nil
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}
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// parsePackage loads package specified by path, parses it and returns
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// a new fileParser with the parsed imports and interfaces.
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func (p *fileParser) parsePackage(path string) (*fileParser, error) {
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newP := &fileParser{
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fileSet: token.NewFileSet(),
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imports: make(map[string]importedPackage),
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importedInterfaces: make(map[string]map[string]*ast.InterfaceType),
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auxInterfaces: make(map[string]map[string]*ast.InterfaceType),
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srcDir: p.srcDir,
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}
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var pkgs map[string]*ast.Package
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if imp, err := build.Import(path, newP.srcDir, build.FindOnly); err != nil {
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return nil, err
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} else if pkgs, err = parser.ParseDir(newP.fileSet, imp.Dir, nil, 0); err != nil {
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return nil, err
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}
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for _, pkg := range pkgs {
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file := ast.MergePackageFiles(pkg, ast.FilterFuncDuplicates|ast.FilterUnassociatedComments|ast.FilterImportDuplicates)
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if _, ok := newP.importedInterfaces[path]; !ok {
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newP.importedInterfaces[path] = make(map[string]*ast.InterfaceType)
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}
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for ni := range iterInterfaces(file) {
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newP.importedInterfaces[path][ni.name.Name] = ni.it
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}
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imports, _ := importsOfFile(file)
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for pkgName, pkgI := range imports {
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newP.imports[pkgName] = pkgI
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}
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}
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return newP, nil
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}
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func (p *fileParser) parseInterface(name, pkg string, it *ast.InterfaceType) (*model.Interface, error) {
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iface := &model.Interface{Name: name}
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for _, field := range it.Methods.List {
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switch v := field.Type.(type) {
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case *ast.FuncType:
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if nn := len(field.Names); nn != 1 {
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return nil, fmt.Errorf("expected one name for interface %v, got %d", iface.Name, nn)
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}
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m := &model.Method{
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Name: field.Names[0].String(),
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}
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var err error
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m.In, m.Variadic, m.Out, err = p.parseFunc(pkg, v)
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if err != nil {
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return nil, err
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}
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iface.AddMethod(m)
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case *ast.Ident:
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// Embedded interface in this package.
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embeddedIfaceType := p.auxInterfaces[pkg][v.String()]
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if embeddedIfaceType == nil {
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embeddedIfaceType = p.importedInterfaces[pkg][v.String()]
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}
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var embeddedIface *model.Interface
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if embeddedIfaceType != nil {
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var err error
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embeddedIface, err = p.parseInterface(v.String(), pkg, embeddedIfaceType)
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if err != nil {
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return nil, err
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}
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} else {
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// This is built-in error interface.
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if v.String() == model.ErrorInterface.Name {
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embeddedIface = &model.ErrorInterface
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} else {
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return nil, p.errorf(v.Pos(), "unknown embedded interface %s", v.String())
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}
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}
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// Copy the methods.
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for _, m := range embeddedIface.Methods {
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iface.AddMethod(m)
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}
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case *ast.SelectorExpr:
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// Embedded interface in another package.
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filePkg, sel := v.X.(*ast.Ident).String(), v.Sel.String()
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embeddedPkg, ok := p.imports[filePkg]
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if !ok {
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return nil, p.errorf(v.X.Pos(), "unknown package %s", filePkg)
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}
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var embeddedIface *model.Interface
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var err error
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embeddedIfaceType := p.auxInterfaces[filePkg][sel]
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if embeddedIfaceType != nil {
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embeddedIface, err = p.parseInterface(sel, filePkg, embeddedIfaceType)
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if err != nil {
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return nil, err
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}
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} else {
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path := embeddedPkg.Path()
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parser := embeddedPkg.Parser()
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if parser == nil {
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ip, err := p.parsePackage(path)
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if err != nil {
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return nil, p.errorf(v.Pos(), "could not parse package %s: %v", path, err)
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}
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parser = ip
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p.imports[filePkg] = importedPkg{
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path: embeddedPkg.Path(),
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parser: parser,
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}
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}
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if embeddedIfaceType = parser.importedInterfaces[path][sel]; embeddedIfaceType == nil {
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return nil, p.errorf(v.Pos(), "unknown embedded interface %s.%s", path, sel)
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}
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embeddedIface, err = parser.parseInterface(sel, path, embeddedIfaceType)
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if err != nil {
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return nil, err
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}
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}
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// Copy the methods.
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// TODO: apply shadowing rules.
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for _, m := range embeddedIface.Methods {
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iface.AddMethod(m)
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}
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default:
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return nil, fmt.Errorf("don't know how to mock method of type %T", field.Type)
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}
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}
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return iface, nil
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}
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func (p *fileParser) parseFunc(pkg string, f *ast.FuncType) (inParam []*model.Parameter, variadic *model.Parameter, outParam []*model.Parameter, err error) {
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if f.Params != nil {
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regParams := f.Params.List
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if isVariadic(f) {
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n := len(regParams)
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varParams := regParams[n-1:]
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regParams = regParams[:n-1]
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vp, err := p.parseFieldList(pkg, varParams)
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if err != nil {
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return nil, nil, nil, p.errorf(varParams[0].Pos(), "failed parsing variadic argument: %v", err)
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}
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variadic = vp[0]
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}
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inParam, err = p.parseFieldList(pkg, regParams)
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if err != nil {
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return nil, nil, nil, p.errorf(f.Pos(), "failed parsing arguments: %v", err)
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}
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}
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if f.Results != nil {
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outParam, err = p.parseFieldList(pkg, f.Results.List)
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if err != nil {
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return nil, nil, nil, p.errorf(f.Pos(), "failed parsing returns: %v", err)
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}
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}
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return
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}
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func (p *fileParser) parseFieldList(pkg string, fields []*ast.Field) ([]*model.Parameter, error) {
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nf := 0
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for _, f := range fields {
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nn := len(f.Names)
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if nn == 0 {
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nn = 1 // anonymous parameter
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}
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nf += nn
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}
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if nf == 0 {
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return nil, nil
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}
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ps := make([]*model.Parameter, nf)
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i := 0 // destination index
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for _, f := range fields {
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t, err := p.parseType(pkg, f.Type)
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if err != nil {
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return nil, err
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}
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if len(f.Names) == 0 {
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// anonymous arg
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ps[i] = &model.Parameter{Type: t}
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i++
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continue
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}
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for _, name := range f.Names {
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ps[i] = &model.Parameter{Name: name.Name, Type: t}
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i++
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}
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}
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return ps, nil
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}
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func (p *fileParser) parseType(pkg string, typ ast.Expr) (model.Type, error) {
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switch v := typ.(type) {
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case *ast.ArrayType:
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ln := -1
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if v.Len != nil {
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var value string
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switch val := v.Len.(type) {
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case (*ast.BasicLit):
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value = val.Value
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case (*ast.Ident):
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// when the length is a const defined locally
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value = val.Obj.Decl.(*ast.ValueSpec).Values[0].(*ast.BasicLit).Value
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case (*ast.SelectorExpr):
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// when the length is a const defined in an external package
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usedPkg, err := importer.Default().Import(fmt.Sprintf("%s", val.X))
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if err != nil {
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return nil, p.errorf(v.Len.Pos(), "unknown package in array length: %v", err)
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}
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ev, err := types.Eval(token.NewFileSet(), usedPkg, token.NoPos, val.Sel.Name)
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if err != nil {
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return nil, p.errorf(v.Len.Pos(), "unknown constant in array length: %v", err)
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}
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value = ev.Value.String()
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}
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x, err := strconv.Atoi(value)
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if err != nil {
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return nil, p.errorf(v.Len.Pos(), "bad array size: %v", err)
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}
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ln = x
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}
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t, err := p.parseType(pkg, v.Elt)
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if err != nil {
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return nil, err
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}
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return &model.ArrayType{Len: ln, Type: t}, nil
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case *ast.ChanType:
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t, err := p.parseType(pkg, v.Value)
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if err != nil {
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return nil, err
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}
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var dir model.ChanDir
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if v.Dir == ast.SEND {
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dir = model.SendDir
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}
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if v.Dir == ast.RECV {
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dir = model.RecvDir
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}
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return &model.ChanType{Dir: dir, Type: t}, nil
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case *ast.Ellipsis:
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// assume we're parsing a variadic argument
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return p.parseType(pkg, v.Elt)
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case *ast.FuncType:
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in, variadic, out, err := p.parseFunc(pkg, v)
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if err != nil {
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return nil, err
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}
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return &model.FuncType{In: in, Out: out, Variadic: variadic}, nil
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case *ast.Ident:
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if v.IsExported() {
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// `pkg` may be an aliased imported pkg
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// if so, patch the import w/ the fully qualified import
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maybeImportedPkg, ok := p.imports[pkg]
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if ok {
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pkg = maybeImportedPkg.Path()
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}
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// assume type in this package
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return &model.NamedType{Package: pkg, Type: v.Name}, nil
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}
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// assume predeclared type
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return model.PredeclaredType(v.Name), nil
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case *ast.InterfaceType:
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if v.Methods != nil && len(v.Methods.List) > 0 {
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return nil, p.errorf(v.Pos(), "can't handle non-empty unnamed interface types")
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}
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return model.PredeclaredType("interface{}"), nil
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case *ast.MapType:
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key, err := p.parseType(pkg, v.Key)
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if err != nil {
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return nil, err
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}
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value, err := p.parseType(pkg, v.Value)
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if err != nil {
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return nil, err
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}
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return &model.MapType{Key: key, Value: value}, nil
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case *ast.SelectorExpr:
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pkgName := v.X.(*ast.Ident).String()
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pkg, ok := p.imports[pkgName]
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if !ok {
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return nil, p.errorf(v.Pos(), "unknown package %q", pkgName)
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}
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return &model.NamedType{Package: pkg.Path(), Type: v.Sel.String()}, nil
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case *ast.StarExpr:
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t, err := p.parseType(pkg, v.X)
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if err != nil {
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return nil, err
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}
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return &model.PointerType{Type: t}, nil
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case *ast.StructType:
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if v.Fields != nil && len(v.Fields.List) > 0 {
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return nil, p.errorf(v.Pos(), "can't handle non-empty unnamed struct types")
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}
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return model.PredeclaredType("struct{}"), nil
|
|
case *ast.ParenExpr:
|
|
return p.parseType(pkg, v.X)
|
|
}
|
|
|
|
return nil, fmt.Errorf("don't know how to parse type %T", typ)
|
|
}
|
|
|
|
// importsOfFile returns a map of package name to import path
|
|
// of the imports in file.
|
|
func importsOfFile(file *ast.File) (normalImports map[string]importedPackage, dotImports []string) {
|
|
var importPaths []string
|
|
for _, is := range file.Imports {
|
|
if is.Name != nil {
|
|
continue
|
|
}
|
|
importPath := is.Path.Value[1 : len(is.Path.Value)-1] // remove quotes
|
|
importPaths = append(importPaths, importPath)
|
|
}
|
|
packagesName := createPackageMap(importPaths)
|
|
normalImports = make(map[string]importedPackage)
|
|
dotImports = make([]string, 0)
|
|
for _, is := range file.Imports {
|
|
var pkgName string
|
|
importPath := is.Path.Value[1 : len(is.Path.Value)-1] // remove quotes
|
|
|
|
if is.Name != nil {
|
|
// Named imports are always certain.
|
|
if is.Name.Name == "_" {
|
|
continue
|
|
}
|
|
pkgName = is.Name.Name
|
|
} else {
|
|
pkg, ok := packagesName[importPath]
|
|
if !ok {
|
|
// Fallback to import path suffix. Note that this is uncertain.
|
|
_, last := path.Split(importPath)
|
|
// If the last path component has dots, the first dot-delimited
|
|
// field is used as the name.
|
|
pkgName = strings.SplitN(last, ".", 2)[0]
|
|
} else {
|
|
pkgName = pkg
|
|
}
|
|
}
|
|
|
|
if pkgName == "." {
|
|
dotImports = append(dotImports, importPath)
|
|
} else {
|
|
if pkg, ok := normalImports[pkgName]; ok {
|
|
switch p := pkg.(type) {
|
|
case duplicateImport:
|
|
normalImports[pkgName] = duplicateImport{
|
|
name: p.name,
|
|
duplicates: append([]string{importPath}, p.duplicates...),
|
|
}
|
|
case importedPkg:
|
|
normalImports[pkgName] = duplicateImport{
|
|
name: pkgName,
|
|
duplicates: []string{p.path, importPath},
|
|
}
|
|
}
|
|
} else {
|
|
normalImports[pkgName] = importedPkg{path: importPath}
|
|
}
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
type namedInterface struct {
|
|
name *ast.Ident
|
|
it *ast.InterfaceType
|
|
}
|
|
|
|
// Create an iterator over all interfaces in file.
|
|
func iterInterfaces(file *ast.File) <-chan namedInterface {
|
|
ch := make(chan namedInterface)
|
|
go func() {
|
|
for _, decl := range file.Decls {
|
|
gd, ok := decl.(*ast.GenDecl)
|
|
if !ok || gd.Tok != token.TYPE {
|
|
continue
|
|
}
|
|
for _, spec := range gd.Specs {
|
|
ts, ok := spec.(*ast.TypeSpec)
|
|
if !ok {
|
|
continue
|
|
}
|
|
it, ok := ts.Type.(*ast.InterfaceType)
|
|
if !ok {
|
|
continue
|
|
}
|
|
|
|
ch <- namedInterface{ts.Name, it}
|
|
}
|
|
}
|
|
close(ch)
|
|
}()
|
|
return ch
|
|
}
|
|
|
|
// isVariadic returns whether the function is variadic.
|
|
func isVariadic(f *ast.FuncType) bool {
|
|
nargs := len(f.Params.List)
|
|
if nargs == 0 {
|
|
return false
|
|
}
|
|
_, ok := f.Params.List[nargs-1].Type.(*ast.Ellipsis)
|
|
return ok
|
|
}
|
|
|
|
// packageNameOfDir get package import path via dir
|
|
func packageNameOfDir(srcDir string) (string, error) {
|
|
files, err := ioutil.ReadDir(srcDir)
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
|
|
var goFilePath string
|
|
for _, file := range files {
|
|
if !file.IsDir() && strings.HasSuffix(file.Name(), ".go") {
|
|
goFilePath = file.Name()
|
|
break
|
|
}
|
|
}
|
|
if goFilePath == "" {
|
|
return "", fmt.Errorf("go source file not found %s", srcDir)
|
|
}
|
|
|
|
packageImport, err := parsePackageImport(srcDir)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
return packageImport, nil
|
|
}
|
|
|
|
var errOutsideGoPath = errors.New("source directory is outside GOPATH")
|