/
parser.go
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/
parser.go
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package parser
import (
"errors"
"go/ast"
"go/token"
"os"
"path/filepath"
"strconv"
"strings"
"github.com/inkeliz/go_inkwasm/bind"
"golang.org/x/tools/go/ast/astutil"
"golang.org/x/tools/go/packages"
)
type Parser struct {
PackagesConfig *packages.Config
parsed map[string][]*bind.Function
visited map[string]bool
}
func NewParser() *Parser {
return &Parser{
PackagesConfig: &packages.Config{
Mode: packages.NeedName | packages.NeedFiles | packages.NeedImports | packages.NeedDeps | packages.NeedSyntax | packages.NeedTypes,
Env: append(os.Environ(), "GOOS=js", "GOARCH=wasm"),
Tests: true,
},
parsed: make(map[string][]*bind.Function, 128),
visited: make(map[string]bool, 128),
}
}
func (p *Parser) ParsePackages(dir string) (map[bind.Package][]*bind.Function, error) {
pkgs, err := packages.Load(p.PackagesConfig, dir)
if err != nil {
return nil, err
}
if len(pkgs) == 0 {
return nil, errors.New("no package found")
}
m := make(map[bind.Package][]*bind.Function, 128)
for _, pkg := range pkgs {
if strings.Contains(pkg.PkgPath, ".test") {
info, err := p.ParsePackage(pkg)
if err != nil {
return nil, err
}
m[bind.Package{Name: pkg.Name, Path: pkg.PkgPath, Dir: filepath.Dir(pkg.GoFiles[0])}] = info
} else {
if err := p.parsePackages(m, pkg); err != nil {
return nil, err
}
}
}
return m, nil
}
func (p *Parser) parsePackages(m map[bind.Package][]*bind.Function, pkg *packages.Package) error {
info, err := p.ParsePackage(pkg)
if err != nil {
return err
}
if len(info) > 0 {
m[bind.Package{Name: pkg.Name, Path: pkg.PkgPath, Dir: filepath.Dir(pkg.GoFiles[0])}] = info
}
for _, imp := range pkg.Imports {
if !p.visited[imp.ID] {
p.visited[imp.ID] = true
if err := p.parsePackages(m, imp); err != nil {
return err
}
}
}
return nil
}
func (p *Parser) ParsePackage(pkg *packages.Package) ([]*bind.Function, error) {
if len(pkg.GoFiles) == 0 {
return nil, nil
}
var infos []*bind.Function
for _, f := range pkg.Syntax {
b, err := p.ParseFile(pkg.PkgPath, pkg.Fset, f)
if err != nil {
return nil, err
}
infos = append(infos, b...)
}
return infos, nil
}
func (p *Parser) ParseFile(pkg string, fset *token.FileSet, file *ast.File) (b []*bind.Function, err error) {
var info *bind.Function
astutil.Apply(file, nil, func(c *astutil.Cursor) bool {
n := c.Node()
switch x := n.(type) {
case *ast.Comment:
if info != nil {
return true
}
info, err = p.parseComment(x.Text)
if err != nil {
return false
}
if info != nil {
b = append(b, info)
}
case *ast.FuncDecl:
if info == nil {
return true
}
if info.FunctionGolang, err = p.parseFunction(pkg, x); err != nil {
return false
}
if fset != nil {
info.File = fset.File(x.Pos()).Name()
info.IsTest = strings.Contains(info.File, "_test")
info.Line = fset.PositionFor(x.Pos(), true).Line
}
info = nil
case *ast.TypeSpec:
if info == nil {
return true
}
info.FunctionGolang.Name = x.Name.Name
info = nil
case *ast.StructType:
if info == nil {
return true
}
if info.FunctionGolang, err = p.parseStruct(pkg, x); err != nil {
return false
}
if fset != nil {
info.File = fset.File(x.Pos()).Name()
info.IsTest = strings.Contains(info.File, "_test")
info.Line = fset.PositionFor(x.Pos(), true).Line
}
default:
if info != nil {
// fmt.Printf("%T %v \n", x, x)
}
}
return true
})
return b, err
}
type filter func(b byte) (filter, error)
func (p *Parser) parseComment(s string) (b *bind.Function, err error) {
const prefixLen = len("//inkwasm:")
if !strings.HasPrefix(s, "//inkwasm:") || len(s) <= prefixLen {
return b, nil
}
var jsName, jsHint strings.Builder
var hint, function filter
hint = func(b byte) (filter, error) {
switch b {
case ' ', '\t':
return function, nil
default:
jsHint.WriteByte(b)
return hint, nil
}
}
function = func(b byte) (filter, error) {
jsName.WriteByte(b)
return function, nil
}
i := prefixLen
l := len(s)
for f := hint; f != nil; {
if i >= l {
break
}
if f, err = f(s[i]); err != nil {
return nil, err
}
i++
}
return &bind.Function{
FunctionJavascript: bind.FunctionJavascript{
Name: strings.TrimSpace(jsName.String()),
Hint: bind.Hint(jsHint.String()),
},
}, nil
}
func (p *Parser) parseFunction(pkg string, f *ast.FuncDecl) (bind.FunctionGolang, error) {
b := bind.FunctionGolang{
Name: f.Name.Name,
Arguments: nil,
Result: nil,
}
if err := p.parseFields(pkg, &b.Arguments, f.Type.Params); err != nil {
return b, err
}
if err := p.parseFields(pkg, &b.Result, f.Type.Results); err != nil {
return b, err
}
return b, nil
}
func (p *Parser) parseStruct(pkg string, f *ast.StructType) (bind.FunctionGolang, error) {
b := bind.FunctionGolang{
Arguments: nil,
}
if err := p.parseFields(pkg, &b.Arguments, f.Fields); err != nil {
return b, err
}
if len(b.Arguments) > 0 && (b.Arguments[0].Name != "_" || b.Arguments[0].Type != "uint64") {
return b, errors.New(`first argument of exported struct must be uint64 and named as "_"`)
}
return b, nil
}
func (p *Parser) parseFields(pkg string, out *[]bind.Argument, fields *ast.FieldList) error {
if fields == nil || len(fields.List) == 0 {
return nil
}
for _, p := range fields.List {
if len(p.Names) == 0 {
p.Names = []*ast.Ident{{Name: "_"}}
}
for _, n := range p.Names {
*out = append(*out, bind.Argument{Name: n.Name})
arg := &((*out)[len(*out)-1])
if p.Tag != nil {
i := strings.Index(p.Tag.Value, "js:")
if i > -1 || len(p.Tag.Value) > len("js:")+1 {
s := p.Tag.Value[i+len("js:")+1:]
if i = strings.Index(s, `"`); i > -1 {
arg.Tag = s[:i]
}
}
}
switch t := p.Type.(type) {
case *ast.ArrayType:
if err := parseArray(arg, t); err != nil {
return err
}
case *ast.Ident:
if t.Name == "Object" && pkg == "github.com/inkeliz/go_inkwasm/inkwasm" {
t.Name = "inkwasm." + t.Name
}
if err := parseIdent(arg, t); err != nil {
return err
}
case *ast.SelectorExpr:
if err := parseSelector(arg, t); err != nil {
return err
}
case *ast.StarExpr:
if err := parsePointer(arg, t); err != nil {
return err
}
}
}
}
return nil
}
func parseIdent(arg *bind.Argument, t *ast.Ident) error {
arg.ArgType = bind.ModeStatic
arg.Type = t.Name
return nil
}
func parsePointer(arg *bind.Argument, t *ast.StarExpr) error {
arg.ArgType = bind.ModePointer
arg.SubType = new(bind.Argument)
switch tt := t.X.(type) {
case *ast.Ident:
return parseIdent(arg.SubType, tt)
case *ast.SelectorExpr:
return parseSelector(arg.SubType, tt)
default:
return errors.New("invalid format")
}
}
func parseSelector(arg *bind.Argument, t *ast.SelectorExpr) error {
arg.ArgType = bind.ModeStatic
switch tt := t.X.(type) {
case *ast.Ident:
defer func() {
arg.Type = arg.Type + "." + t.Sel.Name
}()
return parseIdent(arg, tt)
default:
return errors.New("invalid format")
}
}
func parseArray(arg *bind.Argument, t *ast.ArrayType) error {
if t.Len == nil {
arg.ArgType = bind.ModeSlice
} else {
arg.ArgType = bind.ModeArray
l, ok := t.Len.(*ast.BasicLit)
if !ok {
return errors.New("invalid array length, the size must be explicit not based on constants")
}
arg.Len, _ = strconv.ParseUint(l.Value, 10, 64)
}
arg.SubType = new(bind.Argument)
switch tt := t.Elt.(type) {
case *ast.Ident:
return parseIdent(arg.SubType, tt)
case *ast.SelectorExpr:
return parseSelector(arg.SubType, tt)
default:
return errors.New("array/slice of pointers isn't supported")
}
}