gpython/stdlib/stdlib.go at main · go-python/gpython · GitHub

History

298 lines (251 loc) · 7.06 KB

Raw

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file.

// Package stdlib provides the bootstrap code to wire in all the stdlib

// (python) modules into a gpython context and VM.

package stdlib

import (

"bytes"

"os"

"path"

"path/filepath"

"strings"

"sync"

"github.com/go-python/gpython/py"

"github.com/go-python/gpython/stdlib/marshal"

"github.com/go-python/gpython/vm"

_ "github.com/go-python/gpython/stdlib/array"

_ "github.com/go-python/gpython/stdlib/binascii"

_ "github.com/go-python/gpython/stdlib/builtin"

_ "github.com/go-python/gpython/stdlib/glob"

_ "github.com/go-python/gpython/stdlib/math"

_ "github.com/go-python/gpython/stdlib/os"

_ "github.com/go-python/gpython/stdlib/string"

_ "github.com/go-python/gpython/stdlib/sys"

_ "github.com/go-python/gpython/stdlib/tempfile"

_ "github.com/go-python/gpython/stdlib/time"

)

func init() {

// Assign the base-level py.Context creation function while also preventing an import cycle.

py.NewContext = NewContext

}

// context implements interface py.Context

type context struct {

store *py.ModuleStore

opts py.ContextOpts

closeOnce sync.Once

closing bool

closed bool

running sync.WaitGroup

done chan struct{}

}

// NewContext creates a new gpython interpreter instance context.

// See interface py.Context defined in py/run.go

func NewContext(opts py.ContextOpts) py.Context {

ctx := &context{

opts: opts,

done: make(chan struct{}),

closing: false,

closed: false,

}

ctx.store = py.NewModuleStore()

py.Import(ctx, "builtins", "sys")

sys_mod := ctx.Store().MustGetModule("sys")

sys_mod.Globals["argv"] = py.NewListFromStrings(opts.SysArgs)

sys_mod.Globals["path"] = py.NewListFromStrings(opts.SysPaths)

return ctx

}

// ModuleInit digests a ModuleImpl, compiling and marshalling as needed, creating a new Module instance in this Context.

func (ctx *context) ModuleInit(impl *py.ModuleImpl) (*py.Module, error) {

err := ctx.pushBusy()

defer ctx.popBusy()

if err != nil {

return nil, err

}

if impl.Code == nil && len(impl.CodeSrc) > 0 {

impl.Code, err = py.Compile(string(impl.CodeSrc), impl.Info.FileDesc, py.ExecMode, 0, true)

if err != nil {

return nil, err

}

if impl.Code == nil && len(impl.CodeBuf) > 0 {

codeBuf := bytes.NewBuffer(impl.CodeBuf)

obj, err := marshal.ReadObject(codeBuf)

if err != nil {

return nil, err

}

impl.Code, _ = obj.(*py.Code)

if impl.Code == nil {

return nil, py.ExceptionNewf(py.AssertionError, "Embedded code did not produce a py.Code object")

}

module, err := ctx.Store().NewModule(ctx, impl)

if err != nil {

return nil, err

}

if impl.Code != nil {

_, err = ctx.RunCode(impl.Code, module.Globals, module.Globals, nil)

if err != nil {

return nil, err

}

return module, nil

}

// See interface py.Context defined in py/run.go

func (ctx *context) ResolveAndCompile(pathname string, opts py.CompileOpts) (py.CompileOut, error) {

err := ctx.pushBusy()

defer ctx.popBusy()

if err != nil {

return py.CompileOut{}, err

}

tryPaths := defaultPaths

if opts.UseSysPaths {

tryPaths = ctx.Store().MustGetModule("sys").Globals["path"].(*py.List).Items

}

out := py.CompileOut{}

err = resolveRunPath(pathname, opts, tryPaths, func(fpath string) (bool, error) {

stat, err := os.Stat(fpath)

if err == nil && stat.IsDir() {

// FIXME this is a massive simplification!

fpath = path.Join(fpath, "__init__.py")

_, err = os.Stat(fpath)

}

ext := strings.ToLower(filepath.Ext(fpath))

if ext == "" && os.IsNotExist(err) {

fpath += ".py"

ext = ".py"

_, err = os.Stat(fpath)

}

// Keep searching while we get FNFs, stop on an error

if err != nil {

if os.IsNotExist(err) {

return true, nil

}

err = py.ExceptionNewf(py.OSError, "Error accessing %q: %v", fpath, err)

return false, err

}

switch ext {

case ".py":

var pySrc []byte

pySrc, err = os.ReadFile(fpath)

if err != nil {

return false, py.ExceptionNewf(py.OSError, "Error reading %q: %v", fpath, err)

}

out.Code, err = py.Compile(string(pySrc), fpath, py.ExecMode, 0, true)

if err != nil {

return false, err

}

out.SrcPathname = fpath

case ".pyc":

file, err := os.Open(fpath)

if err != nil {

return false, py.ExceptionNewf(py.OSError, "Error opening %q: %v", fpath, err)

}

defer file.Close()

codeObj, err := marshal.ReadPyc(file)

if err != nil {

return false, py.ExceptionNewf(py.ImportError, "Failed to marshal %q: %v", fpath, err)

}

out.Code, _ = codeObj.(*py.Code)

out.PycPathname = fpath

}

out.FileDesc = fpath

return false, nil

})

if out.Code == nil && err == nil {

err = py.ExceptionNewf(py.AssertionError, "Missing code object")

}

if err != nil {

return py.CompileOut{}, err

}

return out, nil

}

func (ctx *context) pushBusy() error {

if ctx.closed {

return py.ExceptionNewf(py.RuntimeError, "Context closed")

}

ctx.running.Add(1)

return nil

}

func (ctx *context) popBusy() {

ctx.running.Done()

}

// See interface py.Context defined in py/run.go

func (ctx *context) Close() error {

ctx.closeOnce.Do(func() {

ctx.closing = true

ctx.running.Wait()

ctx.closed = true

// Give each module a chance to release resources

ctx.store.OnContextClosed()

close(ctx.done)

})

return nil

}

// See interface py.Context defined in py/run.go

func (ctx *context) Done() <-chan struct{} {

return ctx.done

}

var defaultPaths = []py.Object{

py.String("."),

}

func resolveRunPath(runPath string, opts py.CompileOpts, pathObjs []py.Object, tryPath func(pyPath string) (bool, error)) error {

runPath = strings.TrimSuffix(runPath, "/")

var (

err error

cwd string

cont = true

)

for _, pathObj := range pathObjs {

pathStr, ok := pathObj.(py.String)

if !ok {

continue

}

// If an absolute path, just try that.

// Otherwise, check from the passed current dir then check from the current working dir.

fpath := path.Join(string(pathStr), runPath)

if filepath.IsAbs(fpath) {

cont, err = tryPath(fpath)

} else {

if len(opts.CurDir) > 0 {

subPath := path.Join(opts.CurDir, fpath)

cont, err = tryPath(subPath)

}

if cont && err == nil {

if cwd == "" {

cwd, _ = os.Getwd()

}

subPath := path.Join(cwd, fpath)

cont, err = tryPath(subPath)

}

if !cont {

break

}

if err != nil {

return err

}

if cont {

return py.ExceptionNewf(py.FileNotFoundError, "Failed to resolve %q", runPath)

}

return err

}

// See interface py.Context defined in py/run.go

func (ctx *context) RunCode(code *py.Code, globals, locals py.StringDict, closure py.Tuple) (py.Object, error) {

err := ctx.pushBusy()

defer ctx.popBusy()

if err != nil {

return nil, err

}

return vm.EvalCode(ctx, code, globals, locals, nil, nil, nil, nil, closure)

}

// See interface py.Context defined in py/run.go

func (ctx *context) GetModule(moduleName string) (*py.Module, error) {

return ctx.store.GetModule(moduleName)

}

// See interface py.Context defined in py/run.go

func (ctx *context) Store() *py.ModuleStore {

return ctx.store

}

gpython/stdlib/stdlib.go at main · go-python/gpython · GitHub

Uh oh!

Expand file tree

Breadcrumbs

stdlib.go

Latest commit

History

Breadcrumbs

stdlib.go

File metadata and controls