/
prog.go
169 lines (145 loc) · 3.66 KB
/
prog.go
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// Copyright(C) 2022 github.com/fsgo All Rights Reserved.
// Author: hidu <duv123@gmail.com>
// Date: 2022/9/17
package xpasser
import (
"context"
"errors"
"fmt"
"go/ast"
"go/parser"
"go/token"
"log"
"os"
"path/filepath"
"sync"
"time"
"golang.org/x/tools/go/packages"
"github.com/fsgo/go_fmt/internal/common"
)
// Program 一个应用
type Program struct {
FSet *token.FileSet
pkgs []*packages.Package
}
func (pr *Program) Packages() []*packages.Package {
return pr.pkgs
}
// Default 默认的应用
var Default = &Program{
FSet: token.NewFileSet(),
}
// Reset 重置默认环境,用于测试
func Reset() {
Default = &Program{
FSet: token.NewFileSet(),
}
overlayMux.Lock()
overlay = nil
overlayMux.Unlock()
}
var overlayMux sync.Mutex
// Overlay see packages.Config.Overlay
var overlay map[string][]byte
// LoadOverlay 加载文件,用于测试
func LoadOverlay(fileName string, code []byte) error {
overlayMux.Lock()
defer overlayMux.Unlock()
if overlay == nil {
overlay = map[string][]byte{}
}
ap, err := filepath.Abs(fileName)
if err != nil {
return err
}
if len(code) == 0 {
bf, err := os.ReadFile(ap)
if err != nil {
return err
}
code = bf
}
overlay[ap] = code
return nil
}
func getOverlay() map[string][]byte {
overlayMux.Lock()
defer overlayMux.Unlock()
return overlay
}
// Load 加载解析应用
func Load(opt common.Options, patterns []string) error {
start := time.Now()
ctx, cancel := context.WithTimeout(context.Background(), 2*time.Minute)
defer cancel()
conf := packages.Config{
Context: ctx,
Mode: packages.NeedName | packages.NeedFiles | packages.NeedCompiledGoFiles |
packages.NeedImports | packages.NeedTypes | packages.NeedTypesSizes |
packages.NeedSyntax | packages.NeedTypesInfo,
Tests: true,
Fset: Default.FSet,
Overlay: getOverlay(),
// Logf: func(format string, args ...interface{}) {
// log.Printf(format,args...)
// },
}
if len(patterns) == 0 {
patterns = []string{"./..."}
}
if opt.Trace {
log.Println("prog.Load_start")
}
pkgs, err := packages.Load(&conf, patterns...)
if err != nil {
return err
}
Default.pkgs = pkgs
if opt.Trace {
log.Println("prog.Load_done", "pkgs", pkgs, "patterns=", patterns, "cost=", time.Since(start).String())
}
return nil
}
var errFileNotFound = errors.New("file not found in pkgs")
func (pr *Program) findPkg(filename string) (*packages.Package, *ast.File, error) {
ap, err := filepath.Abs(filename)
if err != nil {
return nil, nil, err
}
goFiles := 0
for i := 0; i < len(pr.pkgs); i++ {
p := pr.pkgs[i]
for j, n := range p.CompiledGoFiles {
goFiles++
if n == ap {
if len(p.Syntax) <= j {
return nil, nil, fmt.Errorf("%w: %s, invalid Syntax, Errors: %v", errFileNotFound, filename, p.Errors)
}
return p, p.Syntax[j], nil
}
}
}
return nil, nil, fmt.Errorf("%w: %s, len(pkgs)=%d, goFiles=%d", errFileNotFound, filename, len(pr.pkgs), goFiles)
}
// FindPackage 查找所属 package
func (pr *Program) FindPackage(filename string) (*packages.Package, error) {
p, _, err := pr.findPkg(filename)
return p, err
}
// ParserFile 解析文件
func (pr *Program) ParserFile(filename string, src any) (*ast.File, error) {
_, f, err := pr.findPkg(filename)
if len(pr.pkgs) == 0 || (err != nil && errors.Is(err, errFileNotFound)) {
mod := parser.Mode(0) | parser.ParseComments
return parser.ParseFile(pr.FSet, filename, src, mod)
}
return f, err
}
// ParserFile 解析文件
func ParserFile(filename string, src any) (*ast.File, error) {
return Default.ParserFile(filename, src)
}
// FindPackage 查找 pkg 信息
func FindPackage(filename string) (*packages.Package, error) {
return Default.FindPackage(filename)
}