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bind.go
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bind.go
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// Copyright 2015 The go-python Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package bind
import (
"bytes"
"fmt"
"go/token"
"io"
"os"
)
// ErrorList is a list of errors
type ErrorList []error
func (list ErrorList) Error() string {
buf := new(bytes.Buffer)
for i, err := range list {
if i > 0 {
buf.WriteRune('\n')
}
io.WriteString(buf, err.Error())
}
return buf.String()
}
// GenCPython generates a (C)Python package from a Go package
func GenCPython(w io.Writer, fset *token.FileSet, pkg *Package, vm string, lang int) error {
gen := &cpyGen{
decl: &printer{buf: new(bytes.Buffer), indentEach: []byte("\t")},
impl: &printer{buf: new(bytes.Buffer), indentEach: []byte("\t")},
fset: fset,
pkg: pkg,
vm: vm,
lang: lang,
}
err := gen.gen()
if err != nil {
return err
}
_, err = io.Copy(w, gen.decl)
if err != nil {
return err
}
_, err = io.Copy(w, gen.impl)
if err != nil {
return err
}
return err
}
// GenCFFI generates a CFFI package from a Go package
// Use 4spaces indentation for Python codes, aka PEP8.
// w is an io.Writer for a wrapper python script which will be executed by a user.
//
// GenCFFI generates a wrapper python script by 2 steps.
// First, GenCFFI analyzes which interfaces should be exposed from the Go package.
// Then, GenCFFI writes a wrapper python script.
func GenCFFI(w io.Writer, fset *token.FileSet, pkg *Package, vm string, lang int) error {
gen := &cffiGen{
wrapper: &printer{buf: new(bytes.Buffer), indentEach: []byte(" ")},
fset: fset,
pkg: pkg,
vm: vm,
lang: lang,
}
err := gen.gen()
if err != nil {
return err
}
_, err = io.Copy(w, gen.wrapper)
if err != nil {
return err
}
return err
}
// GenGo generates a cgo package from a Go package
func GenGo(w io.Writer, fset *token.FileSet, pkg *Package, lang int, vm, capi string) error {
buf := new(bytes.Buffer)
gen := &goGen{
printer: &printer{buf: buf, indentEach: []byte("\t")},
fset: fset,
pkg: pkg,
vm: vm,
lang: lang,
capi: capi,
}
err := gen.gen()
if err != nil {
return err
}
_, err = io.Copy(w, gen.buf)
return err
}
const (
doDebug = true
)
func debugf(format string, args ...interface{}) (int, error) {
if doDebug {
return fmt.Fprintf(os.Stderr, format, args...)
}
return 0, nil
}