gpython/py/util.go at main · go-python/gpython · GitHub

History

236 lines (208 loc) · 4.73 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

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

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

package py

import (

"errors"

"strconv"

"strings"

)

var (

ErrUnsupportedObjType = errors.New("unsupported obj type")

)

// GetLen is a high-level convenience function that returns the length of the given Object.

func GetLen(obj Object) (Int, error) {

getlen, ok := obj.(I__len__)

if !ok {

return 0, nil

}

lenObj, err := getlen.M__len__()

if err != nil {

return 0, err

}

return GetInt(lenObj)

}

// GetInt is a high-level convenience function that converts the given value to an int.

func GetInt(obj Object) (Int, error) {

toIdx, ok := obj.(I__index__)

if !ok {

_, err := cantConvert(obj, "int")

return 0, err

}

return toIdx.M__index__()

}

// LoadTuple attempts to convert each element of the given list and store into each destination value (based on its type).

func LoadTuple(args Tuple, vars []interface{}) error {

if len(args) > len(vars) {

return ExceptionNewf(RuntimeError, "%d args given, expected %d", len(args), len(vars))

}

if len(vars) > len(args) {

vars = vars[:len(args)]

}

for i, rval := range vars {

err := loadValue(args[i], rval)

if err == ErrUnsupportedObjType {

return ExceptionNewf(TypeError, "arg %d has unsupported object type: %s", i, args[i].Type().Name)

}

return nil

}

// LoadAttr gets the named attribute and attempts to store it into the given destination value (based on its type).

func LoadAttr(obj Object, attrName string, dst interface{}) error {

attr, err := GetAttrString(obj, attrName)

if err != nil {

return err

}

err = loadValue(attr, dst)

if err == ErrUnsupportedObjType {

return ExceptionNewf(TypeError, "attribute \"%s\" has unsupported object type: %s", attrName, attr.Type().Name)

}

return nil

}

// LoadIntsFromList extracts a list of ints contained given a py.List or py.Tuple

func LoadIntsFromList(list Object) ([]int64, error) {

N, err := GetLen(list)

if err != nil {

return nil, err

}

getter, ok := list.(I__getitem__)

if !ok {

return nil, nil

}

if N <= 0 {

return nil, nil

}

intList := make([]int64, N)

for i := Int(0); i < N; i++ {

item, err := getter.M__getitem__(i)

if err != nil {

return nil, err

}

var intVal Int

intVal, err = GetInt(item)

if err != nil {

return nil, err

}

intList[i] = int64(intVal)

}

return intList, nil

}

func loadValue(src Object, data interface{}) error {

var (

v_str string

v_float float64

v_int int64

)

haveStr := false

switch v := src.(type) {

case Bool:

if v {

v_int = 1

v_float = 1

v_str = "True"

} else {

v_str = "False"

}

haveStr = true

case Int:

v_int = int64(v)

v_float = float64(v)

case Float:

v_int = int64(v)

v_float = float64(v)

case String:

v_str = string(v)

haveStr = true

case NoneType:

// No-op

default:

return ErrUnsupportedObjType

}

switch dst := data.(type) {

case *Int:

*dst = Int(v_int)

case *bool:

*dst = v_int != 0

case *int8:

*dst = int8(v_int)

case *uint8:

*dst = uint8(v_int)

case *int16:

*dst = int16(v_int)

case *uint16:

*dst = uint16(v_int)

case *int32:

*dst = int32(v_int)

case *uint32:

*dst = uint32(v_int)

case *int:

*dst = int(v_int)

case *uint:

*dst = uint(v_int)

case *int64:

*dst = v_int

case *uint64:

*dst = uint64(v_int)

case *float32:

if haveStr {

v_float, _ = strconv.ParseFloat(v_str, 32)

}

*dst = float32(v_float)

case *float64:

if haveStr {

v_float, _ = strconv.ParseFloat(v_str, 64)

}

*dst = v_float

case *Float:

if haveStr {

v_float, _ = strconv.ParseFloat(v_str, 64)

}

*dst = Float(v_float)

case *string:

*dst = v_str

case *String:

*dst = String(v_str)

// case []uint64:

// for i := range data {

// dst[i] = order.Uint64(bs[8*i:])

// }

// case []float32:

// for i := range data {

// dst[i] = math.Float32frombits(order.Uint32(bs[4*i:]))

// }

// case []float64:

// for i := range data {

// dst[i] = math.Float64frombits(order.Uint64(bs[8*i:]))

// }

default:

return ExceptionNewf(NotImplementedError, "%s", "unsupported Go data type")

}

return nil

}

// Println prints the provided strings to gpython's stdout.

func Println(self Object, args ...string) bool {

sysModule, err := self.(*Module).Context.GetModule("sys")

if err != nil {

return false

}

stdout := sysModule.Globals["stdout"]

write, err := GetAttrString(stdout, "write")

if err != nil {

return false

}

call, ok := write.(I__call__)

if !ok {

return false

}

for _, v := range args {

if !strings.Contains(v, "\n") {

v += " "

}

_, err := call.M__call__(Tuple{String(v)}, nil)

if err != nil {

return false

}

_, err = call.M__call__(Tuple{String("\n")}, nil) // newline

return err == nil

}

gpython/py/util.go at main · go-python/gpython · GitHub

Uh oh!

Expand file tree

Breadcrumbs

util.go

Latest commit

History

Breadcrumbs

util.go

File metadata and controls