mirror of https://github.com/go-python/gopy.git
546 lines
13 KiB
Go
546 lines
13 KiB
Go
// Copyright 2015 The go-python Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package bind
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import (
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"fmt"
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"go/token"
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"path/filepath"
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"strings"
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)
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const (
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cPreamble = `/*
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C stubs for package %[1]s.
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gopy gen -lang=python %[1]s
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File is generated by gopy gen. Do not edit.
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*/
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#ifdef _POSIX_C_SOURCE
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#undef _POSIX_C_SOURCE
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#endif
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#include "Python.h"
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#include "structmember.h"
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// header exported from 'go tool cgo'
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#include "%[3]s.h"
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`
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)
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type cpyGen struct {
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decl *printer
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impl *printer
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fset *token.FileSet
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pkg *Package
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err ErrorList
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}
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func (g *cpyGen) gen() error {
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g.genPreamble()
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// first, process structs
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for _, s := range g.pkg.structs {
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g.genStruct(s)
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}
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for _, f := range g.pkg.funcs {
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g.genFunc(f)
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}
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g.impl.Printf("static PyMethodDef cpy_%s_methods[] = {\n", g.pkg.pkg.Name())
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g.impl.Indent()
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for _, f := range g.pkg.funcs {
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name := f.GoName()
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//obj := scope.Lookup(name)
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g.impl.Printf("{%[1]q, %[2]s, METH_VARARGS, %[3]q},\n",
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name, "gopy_"+f.ID(), f.Doc(),
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)
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}
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g.impl.Printf("{NULL, NULL, 0, NULL} /* Sentinel */\n")
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g.impl.Outdent()
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g.impl.Printf("};\n\n")
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g.impl.Printf("PyMODINIT_FUNC\ninit%[1]s(void)\n{\n", g.pkg.pkg.Name())
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g.impl.Indent()
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g.impl.Printf("PyObject *module = NULL;\n\n")
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for _, s := range g.pkg.structs {
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g.impl.Printf(
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"if (PyType_Ready(&_gopy_%sType) < 0) { return; }\n",
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s.ID(),
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)
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}
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g.impl.Printf("module = Py_InitModule3(%[1]q, cpy_%[1]s_methods, %[2]q);\n\n",
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g.pkg.pkg.Name(),
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g.pkg.doc.Doc,
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)
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for _, s := range g.pkg.structs {
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g.impl.Printf("Py_INCREF(&_gopy_%sType);\n", s.ID())
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g.impl.Printf("PyModule_AddObject(module, %q, (PyObject*)&_gopy_%sType);\n\n",
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s.GoName(),
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s.ID(),
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)
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}
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g.impl.Outdent()
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g.impl.Printf("}\n\n")
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if len(g.err) > 0 {
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return g.err
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}
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return nil
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}
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func (g *cpyGen) genFunc(o Func) {
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g.impl.Printf(`
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/* pythonization of: %[1]s.%[2]s */
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static PyObject*
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gopy_%[3]s(PyObject *self, PyObject *args) {
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`,
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g.pkg.pkg.Name(),
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o.GoName(),
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o.ID(),
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)
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g.impl.Indent()
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g.genFuncBody(o.ID(), o.Signature())
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g.impl.Outdent()
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g.impl.Printf("}\n\n")
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}
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func (g *cpyGen) genFuncBody(id string, sig *Signature) {
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funcArgs := []string{}
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res := sig.Results()
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args := sig.Params()
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var recv *Var
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if sig.Recv() != nil {
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recv = sig.Recv()
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recv.genRecvDecl(g.impl)
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funcArgs = append(funcArgs, recv.getFuncArg())
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}
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for _, arg := range args {
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arg.genDecl(g.impl)
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funcArgs = append(funcArgs, arg.getFuncArg())
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}
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// FIXME(sbinet) pythonize (turn errors into python exceptions)
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if len(res) > 0 {
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switch len(res) {
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case 1:
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ret := res[0]
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ret.genRetDecl(g.impl)
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default:
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g.impl.Printf("struct %[1]s_return c_gopy_ret;\n", id)
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/*
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for i := 0; i < res.Len(); i++ {
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ret := res.At(i)
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n := ret.Name()
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if n == "" {
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n = "gopy_" + strconv.Itoa(i)
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}
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g.impl.Printf("%[1]s c_%[2]s;\n", ctypeName(ret.Type()), n)
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}
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*/
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}
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}
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g.impl.Printf("\n")
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if recv != nil {
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recv.genRecvImpl(g.impl)
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}
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if len(args) > 0 {
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g.impl.Printf("if (!PyArg_ParseTuple(args, ")
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format := []string{}
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pyaddrs := []string{}
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for _, arg := range args {
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pyfmt, addr := arg.getArgParse()
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format = append(format, pyfmt)
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pyaddrs = append(pyaddrs, addr)
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}
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g.impl.Printf("%q, %s)) {\n", strings.Join(format, ""), strings.Join(pyaddrs, ", "))
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g.impl.Indent()
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g.impl.Printf("return NULL;\n")
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g.impl.Outdent()
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g.impl.Printf("}\n\n")
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}
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if len(args) > 0 {
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for _, arg := range args {
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arg.genFuncPreamble(g.impl)
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}
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g.impl.Printf("\n")
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}
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if len(res) > 0 {
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g.impl.Printf("c_gopy_ret = ")
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}
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g.impl.Printf("GoPy_%[1]s(%[2]s);\n", id, strings.Join(funcArgs, ", "))
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g.impl.Printf("\n")
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if len(res) <= 0 {
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g.impl.Printf("Py_INCREF(Py_None);\nreturn Py_None;\n")
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return
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}
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format := []string{}
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funcArgs = []string{}
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switch len(res) {
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case 1:
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ret := res[0]
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pyfmt, _ := ret.getArgParse()
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format = append(format, pyfmt)
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funcArgs = append(funcArgs, "c_gopy_ret")
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default:
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for _, ret := range res {
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pyfmt, _ := ret.getArgParse()
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format = append(format, pyfmt)
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funcArgs = append(funcArgs, ret.getFuncArg())
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}
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}
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g.impl.Printf("return Py_BuildValue(%q, %s);\n",
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strings.Join(format, ""),
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strings.Join(funcArgs, ", "),
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)
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//g.impl.Printf("return NULL;\n")
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}
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func (g *cpyGen) genStruct(cpy Struct) {
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pkgname := cpy.Package().Name()
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//fmt.Printf("obj: %#v\ntyp: %#v\n", obj, typ)
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g.decl.Printf("/* --- decls for struct %s.%v --- */\n", pkgname, cpy.GoName())
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g.decl.Printf("typedef void* GoPy_%s;\n\n", cpy.ID())
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g.decl.Printf("/* type for struct %s.%v\n", pkgname, cpy.GoName())
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g.decl.Printf(" */\ntypedef struct {\n")
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g.decl.Indent()
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g.decl.Printf("PyObject_HEAD\n")
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g.decl.Printf("GoPy_%[1]s cgopy; /* unsafe.Pointer to %[1]s */\n", cpy.ID())
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g.decl.Outdent()
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g.decl.Printf("} _gopy_%s;\n", cpy.ID())
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g.decl.Printf("\n\n")
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g.impl.Printf("/* --- impl for %s.%v */\n\n", pkgname, cpy.GoName())
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g.genStructNew(cpy)
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g.genStructDealloc(cpy)
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g.genStructInit(cpy)
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g.genStructMembers(cpy)
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g.genStructMethods(cpy)
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g.impl.Printf("static PyTypeObject _gopy_%sType = {\n", cpy.ID())
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g.impl.Indent()
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g.impl.Printf("PyObject_HEAD_INIT(NULL)\n")
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g.impl.Printf("0,\t/*ob_size*/\n")
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g.impl.Printf("\"%s.%s\",\t/*tp_name*/\n", pkgname, cpy.GoName())
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g.impl.Printf("sizeof(_gopy_%s),\t/*tp_basicsize*/\n", cpy.ID())
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g.impl.Printf("0,\t/*tp_itemsize*/\n")
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g.impl.Printf("(destructor)_gopy_%s_dealloc,\t/*tp_dealloc*/\n", cpy.ID())
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g.impl.Printf("0,\t/*tp_print*/\n")
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g.impl.Printf("0,\t/*tp_getattr*/\n")
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g.impl.Printf("0,\t/*tp_setattr*/\n")
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g.impl.Printf("0,\t/*tp_compare*/\n")
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g.impl.Printf("0,\t/*tp_repr*/\n")
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g.impl.Printf("0,\t/*tp_as_number*/\n")
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g.impl.Printf("0,\t/*tp_as_sequence*/\n")
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g.impl.Printf("0,\t/*tp_as_mapping*/\n")
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g.impl.Printf("0,\t/*tp_hash */\n")
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g.impl.Printf("0,\t/*tp_call*/\n")
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g.impl.Printf("0,\t/*tp_str*/\n")
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g.impl.Printf("0,\t/*tp_getattro*/\n")
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g.impl.Printf("0,\t/*tp_setattro*/\n")
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g.impl.Printf("0,\t/*tp_as_buffer*/\n")
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g.impl.Printf("Py_TPFLAGS_DEFAULT,\t/*tp_flags*/\n")
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g.impl.Printf("%q,\t/* tp_doc */\n", cpy.Doc())
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g.impl.Printf("0,\t/* tp_traverse */\n")
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g.impl.Printf("0,\t/* tp_clear */\n")
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g.impl.Printf("0,\t/* tp_richcompare */\n")
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g.impl.Printf("0,\t/* tp_weaklistoffset */\n")
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g.impl.Printf("0,\t/* tp_iter */\n")
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g.impl.Printf("0,\t/* tp_iternext */\n")
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g.impl.Printf("_gopy_%s_methods, /* tp_methods */\n", cpy.ID())
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g.impl.Printf("0,\t/* tp_members */\n")
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g.impl.Printf("_gopy_%s_getsets,\t/* tp_getset */\n", cpy.ID())
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g.impl.Printf("0,\t/* tp_base */\n")
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g.impl.Printf("0,\t/* tp_dict */\n")
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g.impl.Printf("0,\t/* tp_descr_get */\n")
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g.impl.Printf("0,\t/* tp_descr_set */\n")
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g.impl.Printf("0,\t/* tp_dictoffset */\n")
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g.impl.Printf("(initproc)_gopy_%s_init, /* tp_init */\n", cpy.ID())
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g.impl.Printf("0, /* tp_alloc */\n")
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g.impl.Printf("_gopy_%s_new,\t/* tp_new */\n", cpy.ID())
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g.impl.Outdent()
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g.impl.Printf("};\n\n")
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}
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func (g *cpyGen) genStructDealloc(cpy Struct) {
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pkgname := cpy.Package().Name()
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g.decl.Printf("/* tp_dealloc for %s.%v */\n", pkgname, cpy.GoName())
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g.decl.Printf("static void\n_gopy_%[1]s_dealloc(_gopy_%[1]s *self);\n",
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cpy.ID(),
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)
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g.impl.Printf("/* tp_dealloc for %s.%v */\n", pkgname, cpy.GoName())
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g.impl.Printf("static void\n_gopy_%[1]s_dealloc(_gopy_%[1]s *self) {\n",
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cpy.ID(),
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)
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g.impl.Indent()
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g.impl.Printf("self->ob_type->tp_free((PyObject*)self);\n")
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g.impl.Outdent()
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g.impl.Printf("}\n\n")
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}
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func (g *cpyGen) genStructNew(cpy Struct) {
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pkgname := cpy.Package().Name()
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g.decl.Printf("/* tp_new for %s.%v */\n", pkgname, cpy.GoName())
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g.decl.Printf(
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"static PyObject*\n_gopy_%s_new(PyTypeObject *type, PyObject *args, PyObject *kwds);\n",
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cpy.ID(),
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)
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g.impl.Printf("/* tp_new */\n")
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g.impl.Printf(
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"static PyObject*\n_gopy_%s_new(PyTypeObject *type, PyObject *args, PyObject *kwds) {\n",
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cpy.ID(),
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)
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g.impl.Indent()
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g.impl.Printf("_gopy_%s *self;\n", cpy.ID())
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g.impl.Printf("self = (_gopy_%s *)type->tp_alloc(type, 0);\n", cpy.ID())
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g.impl.Printf("self->cgopy = GoPy_%s_new();\n", cpy.ID())
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g.impl.Printf("return (PyObject*)self;\n")
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g.impl.Outdent()
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g.impl.Printf("}\n\n")
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}
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func (g *cpyGen) genStructInit(cpy Struct) {
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pkgname := cpy.Package().Name()
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g.decl.Printf("/* tp_init for %s.%v */\n", pkgname, cpy.GoName())
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g.decl.Printf(
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"static int\n_gopy_%[1]s_init(_gopy_%[1]s *self, PyObject *args, PyObject *kwds);\n",
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cpy.ID(),
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)
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g.impl.Printf("/* tp_init */\n")
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g.impl.Printf(
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"static int\n_gopy_%[1]s_init(_gopy_%[1]s *self, PyObject *args, PyObject *kwds) {\n",
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cpy.ID(),
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)
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g.impl.Indent()
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g.impl.Printf("return 0;\n")
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g.impl.Outdent()
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g.impl.Printf("}\n\n")
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}
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func (g *cpyGen) genStructMembers(cpy Struct) {
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pkgname := cpy.Package().Name()
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typ := cpy.Struct()
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g.decl.Printf("/* tp_getset for %s.%v */\n", pkgname, cpy.GoName())
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for i := 0; i < typ.NumFields(); i++ {
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f := typ.Field(i)
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if !f.Exported() {
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continue
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}
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ft := f.Type()
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g.decl.Printf("static PyObject*\n")
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g.decl.Printf(
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"_gopy_%[1]s_getter_%[2]d(_gopy_%[1]s *self, void *closure); /* %[3]s */\n",
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cpy.ID(),
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i+1,
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f.Name(),
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)
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g.impl.Printf("static PyObject*\n")
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g.impl.Printf(
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"_gopy_%[1]s_getter_%[2]d(_gopy_%[1]s *self, void *closure) /* %[3]s */ {\n",
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cpy.ID(),
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i+1,
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f.Name(),
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)
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g.impl.Indent()
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ftname := cgoTypeName(ft)
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if needWrapType(ft) {
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ftname = fmt.Sprintf("GoPy_%[1]s_field_%d", cpy.GoName(), i+1)
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g.impl.Printf(
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"%[1]s ret = GoPy_%[2]s_getter_%[3]d(self->cgopy);\n",
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ftname,
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cpy.ID(),
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i+1,
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)
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} else {
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g.impl.Printf(
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"%[1]s ret = GoPy_%[2]s_getter_%[3]d(self->cgopy);\n",
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ftname,
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cpy.ID(),
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i+1,
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)
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}
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g.impl.Printf("Py_RETURN_NONE;\n") // FIXME(sbinet)
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g.impl.Outdent()
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g.impl.Printf("}\n\n")
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g.decl.Printf("static int\n")
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g.decl.Printf(
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"_gopy_%[1]s_setter_%[2]d(_gopy_%[1]s *self, PyObject *value, void *closure);\n",
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cpy.ID(),
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i+1,
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)
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g.impl.Printf("static int\n")
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g.impl.Printf(
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"_gopy_%[1]s_setter_%[2]d(_gopy_%[1]s *self, PyObject *value, void *closure) {\n",
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cpy.ID(),
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i+1,
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)
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g.impl.Indent()
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g.impl.Printf("return 0;\n") // FIXME(sbinet)
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g.impl.Outdent()
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g.impl.Printf("}\n\n")
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}
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g.impl.Printf("/* tp_getset for %s.%v */\n", pkgname, cpy.GoName())
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g.impl.Printf("static PyGetSetDef _gopy_%s_getsets[] = {\n", cpy.ID())
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g.impl.Indent()
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for i := 0; i < typ.NumFields(); i++ {
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f := typ.Field(i)
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if !f.Exported() {
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continue
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}
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doc := "doc for " + f.Name() // FIXME(sbinet) retrieve doc for fields
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g.impl.Printf("{%q, ", f.Name())
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g.impl.Printf("(getter)_gopy_%[1]s_getter_%[2]d, ", cpy.ID(), i+1)
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g.impl.Printf("(setter)_gopy_%[1]s_setter_%[2]d, ", cpy.ID(), i+1)
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g.impl.Printf("%q, NULL},\n", doc)
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}
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g.impl.Printf("{NULL} /* Sentinel */\n")
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g.impl.Outdent()
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g.impl.Printf("};\n\n")
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/*
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static PyGetSetDef Noddy_getseters[] = {
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{"first",
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(getter)Noddy_getfirst, (setter)Noddy_setfirst,
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"first name",
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NULL},
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{"last",
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(getter)Noddy_getlast, (setter)Noddy_setlast,
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"last name",
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NULL},
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{NULL}
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};
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*/
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/*
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static PyObject *
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Noddy_getfirst(Noddy *self, void *closure)
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{
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Py_INCREF(self->first);
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return self->first;
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}
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static int
|
|
Noddy_setfirst(Noddy *self, PyObject *value, void *closure)
|
|
{
|
|
if (value == NULL) {
|
|
PyErr_SetString(PyExc_TypeError, "Cannot delete the first attribute");
|
|
return -1;
|
|
}
|
|
|
|
if (! PyString_Check(value)) {
|
|
PyErr_SetString(PyExc_TypeError,
|
|
"The first attribute value must be a string");
|
|
return -1;
|
|
}
|
|
|
|
Py_DECREF(self->first);
|
|
Py_INCREF(value);
|
|
self->first = value;
|
|
|
|
return 0;
|
|
}
|
|
*/
|
|
|
|
}
|
|
|
|
func (g *cpyGen) genStructMethods(cpy Struct) {
|
|
|
|
pkgname := cpy.Package().Name()
|
|
|
|
g.decl.Printf("/* methods for %s.%s */\n\n", pkgname, cpy.GoName())
|
|
for _, m := range cpy.meths {
|
|
g.genMethod(cpy, m)
|
|
}
|
|
|
|
g.impl.Printf("static PyMethodDef _gopy_%s_methods[] = {\n", cpy.ID())
|
|
g.impl.Indent()
|
|
for _, m := range cpy.meths {
|
|
margs := "METH_VARARGS"
|
|
if m.Return() == nil {
|
|
margs = "METH_NOARGS"
|
|
}
|
|
g.impl.Printf(
|
|
"{%[1]q, (PyCFunction)gopy_%[2]s, %[3]s, %[4]q},\n",
|
|
m.GoName(),
|
|
m.ID(),
|
|
margs,
|
|
m.Doc(),
|
|
)
|
|
/*
|
|
{"name", (PyCFunction)Noddy_name, METH_NOARGS,
|
|
"Return the name, combining the first and last name"
|
|
},
|
|
*/
|
|
}
|
|
g.impl.Printf("{NULL} /* sentinel */\n")
|
|
g.impl.Outdent()
|
|
g.impl.Printf("};\n\n")
|
|
}
|
|
|
|
func (g *cpyGen) genMethod(cpy Struct, fct Func) {
|
|
pkgname := g.pkg.pkg.Name()
|
|
g.decl.Printf("/* wrapper of %[1]s.%[2]s */\n",
|
|
pkgname,
|
|
cpy.GoName()+"."+fct.GoName(),
|
|
)
|
|
g.decl.Printf("static PyObject*\n")
|
|
g.decl.Printf("gopy_%s(PyObject *self, PyObject *args);\n", fct.ID())
|
|
|
|
g.impl.Printf("/* wrapper of %[1]s.%[2]s */\n",
|
|
pkgname,
|
|
cpy.GoName()+"."+fct.GoName(),
|
|
)
|
|
g.impl.Printf("static PyObject*\n")
|
|
g.impl.Printf("gopy_%s(PyObject *self, PyObject *args) {\n", fct.ID())
|
|
g.impl.Indent()
|
|
g.genMethodBody(cpy, fct)
|
|
g.impl.Outdent()
|
|
g.impl.Printf("}\n\n")
|
|
}
|
|
|
|
func (g *cpyGen) genMethodBody(cpy Struct, fct Func) {
|
|
g.genFuncBody(fct.ID(), fct.Signature())
|
|
}
|
|
|
|
func (g *cpyGen) genPreamble() {
|
|
n := g.pkg.pkg.Name()
|
|
g.decl.Printf(cPreamble, n, g.pkg.pkg.Path(), filepath.Base(n))
|
|
}
|