forked from limetext/lime
/
gen_python_api.go
481 lines (445 loc) · 12.5 KB
/
gen_python_api.go
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// Copyright 2013 The lime Authors.
// Use of this source code is governed by a 2-clause
// BSD-style license that can be found in the LICENSE file.
// This file generates python bindings for the backend api.
// Similar code would need to be written to generate bindings for other
// scripting languages, though much code is likely shared.
package main
import (
"fmt"
"github.com/limetext/lime/backend"
"github.com/limetext/text"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"reflect"
"regexp"
"strconv"
"strings"
"time"
)
var re = regexp.MustCompile(`\p{Lu}`)
func pyname(in string) string {
switch in {
case "RowCol":
return "_rowcol"
case "String":
return "Str"
case "Len":
return "SeqLen"
case "Get":
return "SeqGet"
}
return re.ReplaceAllStringFunc(in, func(a string) string { return "_" + strings.ToLower(a) })
}
func pyretvar(name string, ot reflect.Type) (string, error) {
return fmt.Sprintf("\npy%s, err = toPython(%s)", name, name), nil
}
func pyret(ot reflect.Type) (string, error) {
v, err := pyretvar("ret", ot)
if err != nil {
return "", err
}
return fmt.Sprintf(`
var pyret py.Object
var err error
%s
return pyret, err
`, v), nil
}
func typename(t reflect.Type) string {
switch t.Kind() {
case reflect.Slice:
return "[]" + typename(t.Elem())
case reflect.Ptr:
return "*" + typename(t.Elem())
default:
return t.String()
}
}
func pytogoconv(in, set, name string, returnsValue bool, t reflect.Type) (string, error) {
r := ""
if returnsValue {
r = "nil, "
}
ty := typename(t)
return fmt.Sprintf(`
if v3, err2 := fromPython(%s); err2 != nil {
return %serr2
} else {
if v2, ok := v3.(%s); !ok {
return %sfmt.Errorf("Expected type %s for %s, not %%s", %s.Type())
} else {
%s = v2
}
}`, in, r, ty, r, ty, name, in, set), nil
}
func generatemethod(m reflect.Method, t2 reflect.Type, callobject, name string) (ret string, err error) {
var (
args string
rv string
in = m.Type.NumIn() - 1
out = m.Type.NumOut()
call string
)
if in > 0 {
args = "tu *py.Tuple"
}
if m.Name == "Get" && in == 1 && m.Type.In(1).Kind() == reflect.Int && out == 1 {
args = "arg0 int64"
}
if m.Name == "String" {
rv = "string"
} else if m.Name == "Len" {
rv = "int64"
} else {
rv = "(py.Object, error)"
}
ret += fmt.Sprintf("\nfunc %s (%s) %s {", name, args, rv)
if m.Name == "Get" && in == 1 && m.Type.In(1).Kind() == reflect.Int && out == 1 {
ret += `var (
pyret0 py.Object
err error
)
if l := ` + callobject + `Len(); int(arg0) >= l || arg0 < 0 {
return nil, py.NewError(py.IndexError, "%d >= %d || %d < 0", arg0, l, arg0)
}
`
ret += "\nret0 := " + callobject + m.Name + "(int(arg0))"
if r, err := pyretvar("ret0", m.Type.Out(0)); err != nil {
return "", err
} else {
ret += r
ret += `
if err != nil {
// TODO: do the py objs need to be freed?
return nil, err
}
`
}
ret += "return pyret0, err\n}\n"
return ret, nil
} else if m.Name == "Len" {
return ret + "return int64(" + callobject + m.Name + "())\n}\n", nil
}
if in > 0 {
ret += "\n\tvar ("
for j := 1; j <= in; j++ {
ret += fmt.Sprintf("\n\t\targ%d %s", j, m.Type.In(j))
}
r := ""
if m.Name != "String" {
r = "nil, "
}
ret += "\n\t)"
for j := 1; j <= in; j++ {
t := m.Type.In(j)
name := fmt.Sprintf("arg%d", j)
msg := fmt.Sprintf("%s.%s() %s", t2, m.Name, name)
pygo, err := pytogoconv("v", name, msg, m.Name != "String", t)
if err != nil {
return "", err
}
if t.Kind() == reflect.Map && t.Key().Kind() == reflect.String {
ret += fmt.Sprintf(`
%s = make(%s)
if v, err := tu.GetItem(%d); err == nil {%s}`, name, t, j-1, pygo)
} else {
ret += fmt.Sprintf(`
if v, err := tu.GetItem(%d); err != nil {
return %serr
} else {%s}`, j-1, r, pygo)
}
}
}
if in > 0 {
call = callobject + m.Name + "("
for j := 1; j <= in; j++ {
if j > 1 {
call += ", "
}
call += fmt.Sprintf("arg%d", j)
}
call += ")"
} else {
call = callobject + m.Name + "()"
}
if m.Name == "String" {
ret += "\n\treturn " + call
} else if out == 1 && m.Type.Out(0).Name() == "error" {
ret += fmt.Sprintf(`
if err := %s; err != nil {
return nil, err
} else {
return toPython(nil)
}`, call)
} else if out > 0 {
ret += "\n\t"
for j := 0; j < out; j++ {
if j > 0 {
ret += ", "
}
ret += fmt.Sprintf("ret%d", j)
}
ret += " := " + call
ret += "\nvar err error"
for j := 0; j < out; j++ {
ret += fmt.Sprintf("\nvar pyret%d py.Object\n", j)
if r, err := pyretvar(fmt.Sprintf("ret%d", j), m.Type.Out(j)); err != nil {
return "", err
} else {
ret += r
ret += "\nif err != nil {"
for k := 0; k < j; k++ {
ret += fmt.Sprintf("\npyret%d.Decref()", k)
}
ret += "\nreturn nil, err\n}"
}
}
if out == 1 {
ret += "\n\treturn pyret0, err"
} else {
// TODO: does PackTuple take ownership of the objects?
ret += "\n\treturn py.PackTuple("
for j := 0; j < out; j++ {
if j > 0 {
ret += ", "
}
ret += fmt.Sprintf("pyret%d", j)
}
ret += ")"
}
} else {
ret += "\n\t" + call + "\n\treturn toPython(nil)"
}
ret += "\n}\n"
return
}
func generatemethodsEx(t reflect.Type, ignorefunc func(name string) bool, callobject string, name func(t reflect.Type, m reflect.Method) string) (methods string) {
t2 := t
if t.Kind() == reflect.Ptr {
t2 = t.Elem()
}
for i := 0; i < t.NumMethod(); i++ {
var (
m = t.Method(i)
reason string
)
if m.Name[0] != strings.ToUpper(m.Name[:1])[0] {
reason = "unexported"
goto skip
}
if ignorefunc != nil && ignorefunc(m.Name) {
reason = "in skip list"
goto skip
}
if m, err := generatemethod(m, t2, callobject, name(t2, m)); err != nil {
reason = err.Error()
goto skip
} else {
methods += m
}
continue
skip:
fmt.Printf("Skipping method %s.%s: %s\n", t2, m.Name, reason)
}
return
}
func generatemethods(t reflect.Type, ignorefunc func(name string) bool) (methods string) {
return generatemethodsEx(t, ignorefunc, "o.data.", func(t2 reflect.Type, m reflect.Method) string {
return fmt.Sprintf("\n(o *%s) Py%s", t2.Name(), pyname(m.Name))
})
}
func generateWrapper(ptr reflect.Type, canCreate bool, ignorefunc func(name string) bool) (ret string) {
t := ptr
if t.Kind() == reflect.Ptr {
t = ptr.Elem()
}
if t.Kind() != reflect.Struct {
panic(t.Kind())
}
it := t.String()
if !canCreate {
it = "*" + it
}
ret += fmt.Sprintf(`
var %sClass = py.Class{
Name: "sublime.%s",
Pointer: (*%s)(nil),
}
type %s struct {
py.BaseObject
data %s
}
`, pyname(t.Name()), t.Name(), t.Name(), t.Name(), it)
cons := ""
if canCreate {
cons = fmt.Sprintf(`
func (o *%s) PyInit(args *py.Tuple, kwds *py.Dict) error {
if args.Size() > %d {
return fmt.Errorf("Expected at most %d arguments")
}
`, t.Name(), t.NumField(), t.NumField())
ok := true
for i := 0; i < t.NumField(); i++ {
f := t.Field(i)
pygo, err := pytogoconv("v", "o.data."+f.Name, t.Name()+"."+f.Name, false, f.Type)
if err != nil {
ok = false
break
}
cons += fmt.Sprintf(`
if args.Size() > %d {
if v, err := args.GetItem(%d); err != nil {
return err
} else {%s
}
}
`, i, i, pygo)
}
if !ok {
cons = ""
} else {
cons += "\n\treturn nil\n}"
}
}
if cons == "" {
ret += fmt.Sprintf(`
func (o *%s) PyInit(args *py.Tuple, kwds *py.Dict) error {
return fmt.Errorf("Can't initialize type %s")
}`, t.Name(), t.Name())
}
ret += cons
ret += generatemethods(ptr, ignorefunc)
for i := 0; i < t.NumField(); i++ {
f := t.Field(i)
if !f.Anonymous && f.Name[0] == strings.ToUpper(f.Name[:1])[0] {
if ignorefunc != nil && ignorefunc(f.Name) {
goto skip
}
if r, err := pyret(f.Type); err != nil {
fmt.Printf("Skipping field %s.%s: %s\n", t.Name(), f.Name, err)
} else if pygo, err := pytogoconv("v", "o.data."+f.Name, t.Name()+"."+f.Name, false, f.Type); err != nil {
fmt.Printf("Skipping field %s.%s: %s\n", t.Name(), f.Name, err)
} else {
ret += fmt.Sprintf(`
func (o *%s) PyGet%s() (py.Object, error) {
ret := o.data.%s%s
}
func (o *%s) PySet%s(v py.Object) error {%s
return nil
}
`, t.Name(), pyname(f.Name), f.Name, r,
t.Name(), pyname(f.Name), pygo,
)
}
skip:
}
}
return
}
const path = "./backend/sublime"
var keep = regexp.MustCompile(`^(.+(_test|_manual)\.go|.+\.py)|(doc\.go)$`)
func cleanup() {
f, err := os.Open(path)
if err != nil {
panic(err)
}
defer f.Close()
if fi, err := f.Readdir(0); err != nil {
panic(err)
} else {
for _, f := range fi {
if !f.IsDir() && !keep.MatchString(f.Name()) {
fn := filepath.Join(path, f.Name())
fmt.Println("removing", fn)
os.Remove(fn)
}
}
}
}
func main() {
cleanup()
var sublime_methods = ""
sn := func(t reflect.Type, m reflect.Method) string {
sn := "sublime_" + m.Name
sublime_methods += fmt.Sprintf("{Name: \"%s\", Func: %s},\n", pyname(m.Name)[1:], sn)
return sn
}
data := [][]string{
{"./backend/sublime/region_generated.go", generateWrapper(reflect.TypeOf(text.Region{}), true, regexp.MustCompile("Cut").MatchString)},
{"./backend/sublime/regionset_generated.go", generateWrapper(reflect.TypeOf(&text.RegionSet{}), false, regexp.MustCompile("Less|Swap|Adjust|Has|Cut").MatchString)},
{"./backend/sublime/edit_generated.go", generateWrapper(reflect.TypeOf(&backend.Edit{}), false, regexp.MustCompile("Apply|Undo").MatchString)},
{"./backend/sublime/view_generated.go", generateWrapper(reflect.TypeOf(&backend.View{}), false, regexp.MustCompile("Buffer|Syntax|CommandHistory|Show|AddRegions|UndoStack|Transform|Reload|Save|Close|ExpandByClass|Erased|FileChanged|Inserted|Find$|^Status").MatchString)},
{"./backend/sublime/window_generated.go", generateWrapper(reflect.TypeOf(&backend.Window{}), false, regexp.MustCompile("OpenFile|SetActiveView|Close").MatchString)},
{"./backend/sublime/settings_generated.go", generateWrapper(reflect.TypeOf(&text.Settings{}), false, regexp.MustCompile("Parent|Set|Get|UnmarshalJSON|MarshalJSON").MatchString)},
{"./backend/sublime/view_buffer_generated.go", generatemethodsEx(
reflect.TypeOf(backend.GetEditor().Console().Buffer()),
regexp.MustCompile("Erase|Insert|Substr|SetFile|AddCallback|AddObserver|RemoveObserver|Data|Runes|Settings|Index|Close|Unlock|Lock").MatchString,
"o.data.Buffer().",
func(t reflect.Type, m reflect.Method) string {
mn := ""
switch m.Name {
case "Line", "LineR", "FullLine", "FullLineR", "WordR", "Word":
mn = strings.ToLower(m.Name)
case "Id":
mn = "Py_buffer_id"
default:
mn = "Py" + pyname(m.Name)
}
return "(o *View) " + mn
})},
{"./backend/sublime/commands_generated.go", generatemethodsEx(reflect.TypeOf(backend.GetEditor().CommandHandler()),
regexp.MustCompile("RunWindowCommand|RunTextCommand|RunApplicationCommand|RegisterWithDefault").MatchString,
"backend.GetEditor().CommandHandler().",
sn),
},
{"./backend/sublime/frontend_generated.go", generatemethodsEx(reflect.TypeOf(backend.GetEditor().Frontend()),
regexp.MustCompile("Show|VisibleRegion|DefaultAction").MatchString,
"backend.GetEditor().Frontend().",
sn),
},
{"./backend/sublime/sublime_api_generated.go", generatemethodsEx(reflect.TypeOf(backend.GetEditor()),
regexp.MustCompile("Info|HandleInput|CommandHandler|Frontend|Console|SetActiveWindow|Init|Watch|Observe|SetClipboardFuncs|KeyBindings").MatchString,
"backend.GetEditor().",
sn),
},
}
data[len(data)-1][1] += fmt.Sprintf(`var sublime_methods = []py.Method{
%s
}`, sublime_methods)
var year = strconv.FormatInt(int64(time.Now().Year()), 10)
for _, gen := range data {
if gen[0] == "" {
continue
}
wr := `// Copyright ` + year + ` The lime Authors.
// Use of this source code is governed by a 2-clause
// BSD-style license that can be found in the LICENSE file.
// This file was generated by tasks/build/gen_python_api.go and shouldn't be manually modified
package sublime
import (
"fmt"
"github.com/limetext/gopy/lib"
"github.com/limetext/lime/backend"
"github.com/limetext/text"
)
var (
_ = backend.View{}
_ = text.Region{}
_ = fmt.Errorf
)
` + gen[1]
if err := ioutil.WriteFile(gen[0], []byte(wr), 0644); err != nil {
panic(err)
} else {
c := exec.Command("go", "fmt", gen[0])
if o, err := c.CombinedOutput(); err != nil {
panic(fmt.Errorf("%s, %s", o, err))
} else {
fmt.Printf("%s", string(o))
}
}
}
}