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class_file.go
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/
class_file.go
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/*
Copyright 2021 The GoPlus Authors (goplus.org)
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package cl
import (
"go/constant"
"go/types"
"path/filepath"
"strings"
goast "go/ast"
"github.com/goplus/gop/ast"
"github.com/goplus/gop/parser"
"github.com/goplus/gop/token"
"github.com/goplus/gox"
)
// -----------------------------------------------------------------------------
type gmxInfo struct {
extSpx string
pkgPaths []string
}
var (
gmxTypes = map[string]gmxInfo{
".gmx": {".spx", []string{"github.com/goplus/spx", "math"}},
".spc": {"", []string{"github.com/qbox/gopla/spc", "github.com/goplus/spx", "math"}},
// TODO: dynamic register
}
)
// RegisterClassFileType registers Go+ class file types.
func RegisterClassFileType(extGmx, extSpx string, pkgPaths ...string) {
if pkgPaths == nil {
panic("RegisterClassFileType: no pkgPath specified")
}
parser.RegisterFileType(extGmx, ast.FileTypeGmx)
if extSpx != "" {
parser.RegisterFileType(extSpx, ast.FileTypeSpx)
}
if _, ok := gmxTypes[extGmx]; !ok {
gmxTypes[extGmx] = gmxInfo{extSpx, pkgPaths}
}
}
// -----------------------------------------------------------------------------
type gmxSettings struct {
gameClass string
extSpx string
game gox.Ref
sprite gox.Ref
scheds []string
schedStmts []goast.Stmt // nil or len(scheds) == 2 (delayload)
pkgImps []*gox.PkgRef
pkgPaths []string
hasScheds bool
gameIsPtr bool
}
func (p *gmxSettings) getScheds(cb *gox.CodeBuilder) []goast.Stmt {
if !p.hasScheds {
return nil
}
if p.schedStmts == nil {
p.schedStmts = make([]goast.Stmt, 2)
for i, v := range p.scheds {
fn := cb.Val(spxLookup(p.pkgImps, v)).Call(0).InternalStack().Pop().Val
p.schedStmts[i] = &goast.ExprStmt{X: fn}
}
if len(p.scheds) < 2 {
p.schedStmts[1] = p.schedStmts[0]
}
}
return p.schedStmts
}
func newGmx(pkg *gox.Package, file string) *gmxSettings {
_, name := filepath.Split(file)
ext := filepath.Ext(name)
if idx := strings.Index(name, "."); idx > 0 {
name = name[:idx]
if name == "main" {
name = "_main"
}
}
gt := gmxTypes[ext]
pkgPaths := gt.pkgPaths
p := &gmxSettings{extSpx: gt.extSpx, gameClass: name, pkgPaths: pkgPaths}
p.pkgImps = make([]*gox.PkgRef, len(pkgPaths))
for i, pkgPath := range pkgPaths {
p.pkgImps[i] = pkg.Import(pkgPath)
}
spx := p.pkgImps[0]
p.game, p.gameIsPtr = spxRef(spx, "Gop_game", "Game")
if gt.extSpx != "" {
p.sprite, _ = spxRef(spx, "Gop_sprite", "Sprite")
}
if x := getStringConst(spx, "Gop_sched"); x != "" {
p.scheds, p.hasScheds = strings.SplitN(x, ",", 2), true
}
return p
}
func spxLookup(pkgImps []*gox.PkgRef, name string) gox.Ref {
for _, pkg := range pkgImps {
if o := pkg.TryRef(name); o != nil {
return o
}
}
panic("spxLookup: symbol not found - " + name)
}
func getDefaultClass(file string) string {
_, name := filepath.Split(file)
if idx := strings.Index(name, "."); idx > 0 {
name = name[:idx]
}
return name
}
func spxRef(spx *gox.PkgRef, name, typ string) (obj gox.Ref, isPtr bool) {
if v := getStringConst(spx, name); v != "" {
typ = v
if strings.HasPrefix(typ, "*") {
typ, isPtr = typ[1:], true
}
}
obj = spx.Ref(typ)
return
}
func getStringConst(spx *gox.PkgRef, name string) string {
if o := spx.TryRef(name); o != nil {
if c, ok := o.(*types.Const); ok {
return constant.StringVal(c.Val())
}
}
return ""
}
func getFields(ctx *blockCtx, f *ast.File) (specs []ast.Spec) {
decls := f.Decls
i, n := 0, len(decls)
for i < n {
g, ok := decls[i].(*ast.GenDecl)
if !ok {
break
}
if g.Tok != token.IMPORT && g.Tok != token.CONST {
if g.Tok == token.VAR {
specs, g.Specs = g.Specs, nil
}
break
}
i++ // skip import, if any
}
return
}
func setBodyHandler(ctx *blockCtx) {
if ctx.fileType > 0 { // in a Go+ class file
if scheds := ctx.getScheds(ctx.cb); scheds != nil {
ctx.cb.SetBodyHandler(func(body *goast.BlockStmt, kind int) {
idx := 0
if len(body.List) == 0 {
idx = 1
}
gox.InsertStmtFront(body, scheds[idx])
})
}
}
}
func gmxMainFunc(p *gox.Package, ctx *pkgCtx) {
if o := p.Types.Scope().Lookup(ctx.gameClass); o != nil && hasMethod(o, "MainEntry") {
// new(Game).Main()
p.NewFunc(nil, "main", nil, nil, false).BodyStart(p).
Val(p.Builtin().Ref("new")).Val(o).Call(1).
MemberVal("Main").Call(0).EndStmt().
End()
}
}
// -----------------------------------------------------------------------------