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compiler.go
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compiler.go
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package compiler
import (
"bytes"
"encoding/binary"
"encoding/gob"
"encoding/json"
"fmt"
"go/token"
"io"
"strings"
"github.com/gopherjs/gopherjs/compiler/prelude"
"golang.org/x/tools/go/gcimporter"
"golang.org/x/tools/go/types"
)
var sizes32 = &types.StdSizes{WordSize: 4, MaxAlign: 8}
var reservedKeywords = make(map[string]bool)
var _ = ___GOPHERJS_REQUIRES_GO_VERSION_1_4___ // compile error on earlier Go versions
func init() {
for _, keyword := range []string{"abstract", "arguments", "boolean", "break", "byte", "case", "catch", "char", "class", "const", "continue", "debugger", "default", "delete", "do", "double", "else", "enum", "eval", "export", "extends", "false", "final", "finally", "float", "for", "function", "goto", "if", "implements", "import", "in", "instanceof", "int", "interface", "let", "long", "native", "new", "null", "package", "private", "protected", "public", "return", "short", "static", "super", "switch", "synchronized", "this", "throw", "throws", "transient", "true", "try", "typeof", "undefined", "var", "void", "volatile", "while", "with", "yield"} {
reservedKeywords[keyword] = true
}
}
type ErrorList []error
func (err ErrorList) Error() string {
return err[0].Error()
}
type Archive struct {
ImportPath string
Name string
Imports []string
GcData []byte
Declarations []*Decl
FileSet []byte
Minified bool
types *types.Package
}
type Decl struct {
FullName string
Vars []string
DeclCode []byte
MethodListCode []byte
TypeInitCode []byte
InitCode []byte
DceObjectFilter string
DceMethodFilter string
DceDeps []string
Blocking bool
}
type Dependency struct {
Pkg string
Type string
Method string
}
func ImportDependencies(archive *Archive, importPkg func(string) (*Archive, error)) ([]*Archive, error) {
var deps []*Archive
paths := make(map[string]bool)
var collectDependencies func(path string) error
collectDependencies = func(path string) error {
if paths[path] {
return nil
}
dep, err := importPkg(path)
if err != nil {
return err
}
for _, imp := range dep.Imports {
if err := collectDependencies(imp); err != nil {
return err
}
}
deps = append(deps, dep)
paths[dep.ImportPath] = true
return nil
}
if err := collectDependencies("runtime"); err != nil {
return nil, err
}
for _, imp := range archive.Imports {
if err := collectDependencies(imp); err != nil {
return nil, err
}
}
deps = append(deps, archive)
return deps, nil
}
func WriteProgramCode(pkgs []*Archive, w *SourceMapFilter) error {
mainPkg := pkgs[len(pkgs)-1]
minify := mainPkg.Minified
declsByObject := make(map[string][]*Decl)
var pendingDecls []*Decl
for _, pkg := range pkgs {
for _, d := range pkg.Declarations {
if d.DceObjectFilter == "" && d.DceMethodFilter == "" {
pendingDecls = append(pendingDecls, d)
continue
}
if d.DceObjectFilter != "" {
d.DceObjectFilter = pkg.ImportPath + "." + d.DceObjectFilter
declsByObject[d.DceObjectFilter] = append(declsByObject[d.DceObjectFilter], d)
}
if d.DceMethodFilter != "" {
d.DceMethodFilter = pkg.ImportPath + "." + d.DceMethodFilter
declsByObject[d.DceMethodFilter] = append(declsByObject[d.DceMethodFilter], d)
}
}
}
for len(pendingDecls) != 0 {
d := pendingDecls[len(pendingDecls)-1]
pendingDecls = pendingDecls[:len(pendingDecls)-1]
for _, dep := range d.DceDeps {
if decls, ok := declsByObject[dep]; ok {
delete(declsByObject, dep)
for _, d := range decls {
if d.DceObjectFilter == dep {
d.DceObjectFilter = ""
}
if d.DceMethodFilter == dep {
d.DceMethodFilter = ""
}
if d.DceObjectFilter == "" && d.DceMethodFilter == "" {
pendingDecls = append(pendingDecls, d)
}
}
}
}
}
if _, err := w.Write([]byte("\"use strict\";\n(function() {\n\n")); err != nil {
return err
}
if _, err := w.Write(removeWhitespace([]byte(prelude.Prelude), minify)); err != nil {
return err
}
if _, err := w.Write([]byte("\n")); err != nil {
return err
}
// write packages
for _, pkg := range pkgs {
if err := WritePkgCode(pkg, minify, w); err != nil {
return err
}
}
if _, err := w.Write([]byte("$synthesizeMethods();\n$packages[\"runtime\"].$init()();\n$go($packages[\"" + string(mainPkg.ImportPath) + "\"].$init, [], true);\n$flushConsole();\n\n}).call(this);\n")); err != nil {
return err
}
return nil
}
func WritePkgCode(pkg *Archive, minify bool, w *SourceMapFilter) error {
if w.MappingCallback != nil && pkg.FileSet != nil {
w.fileSet = token.NewFileSet()
if err := w.fileSet.Read(json.NewDecoder(bytes.NewReader(pkg.FileSet)).Decode); err != nil {
panic(err)
}
}
if _, err := w.Write(removeWhitespace([]byte(fmt.Sprintf("$packages[\"%s\"] = (function() {\n", pkg.ImportPath)), minify)); err != nil {
return err
}
vars := []string{"$pkg = {}", "$ptr = {}"}
var filteredDecls []*Decl
for _, d := range pkg.Declarations {
if d.DceObjectFilter == "" && d.DceMethodFilter == "" {
vars = append(vars, d.Vars...)
filteredDecls = append(filteredDecls, d)
}
}
if _, err := w.Write(removeWhitespace([]byte(fmt.Sprintf("\tvar %s;\n", strings.Join(vars, ", "))), minify)); err != nil {
return err
}
for _, d := range filteredDecls {
if _, err := w.Write(d.DeclCode); err != nil {
return err
}
}
for _, d := range filteredDecls {
if _, err := w.Write(d.MethodListCode); err != nil {
return err
}
}
for _, d := range filteredDecls {
if _, err := w.Write(d.TypeInitCode); err != nil {
return err
}
}
if _, err := w.Write(removeWhitespace([]byte("\t$pkg.$init = function() {\n\t\t$pkg.$init = function() {};\n\t\t/* */ var $r, $s = 0; var $init_"+pkg.Name+" = function() { while (true) { switch ($s) { case 0:\n"), minify)); err != nil {
return err
}
for _, d := range filteredDecls {
if _, err := w.Write(d.InitCode); err != nil {
return err
}
}
if _, err := w.Write(removeWhitespace([]byte("\t\t/* */ } return; } }; $init_"+pkg.Name+".$blocking = true; return $init_"+pkg.Name+";\n\t};\n\treturn $pkg;\n})();"), minify)); err != nil {
return err
}
if _, err := w.Write([]byte("\n")); err != nil { // keep this \n even when minified
return err
}
return nil
}
func ReadArchive(filename, path string, r io.Reader, packages map[string]*types.Package) (*Archive, error) {
var a Archive
if err := gob.NewDecoder(r).Decode(&a); err != nil {
return nil, err
}
var err error
a.types, err = gcimporter.ImportData(packages, filename, path, bytes.NewReader(a.GcData))
if err != nil {
return nil, err
}
packages[path] = a.types
return &a, nil
}
func WriteArchive(a *Archive, w io.Writer) error {
return gob.NewEncoder(w).Encode(a)
}
type SourceMapFilter struct {
Writer io.Writer
MappingCallback func(generatedLine, generatedColumn int, fileSet *token.FileSet, originalPos token.Pos)
line int
column int
fileSet *token.FileSet
}
func (f *SourceMapFilter) Write(p []byte) (n int, err error) {
var n2 int
for {
i := bytes.IndexByte(p, '\b')
w := p
if i != -1 {
w = p[:i]
}
n2, err = f.Writer.Write(w)
n += n2
for {
i := bytes.IndexByte(w, '\n')
if i == -1 {
f.column += len(w)
break
}
f.line++
f.column = 0
w = w[i+1:]
}
if err != nil || i == -1 {
return
}
if f.MappingCallback != nil {
f.MappingCallback(f.line+1, f.column, f.fileSet, token.Pos(binary.BigEndian.Uint32(p[i+1:i+5])))
}
p = p[i+5:]
n += 5
}
}