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How to use transformImpl method of compiler Package

Best K6 code snippet using compiler.transformImpl

compiler.go

Source:compiler.go

...147				"The source for `%s` needs to be transpiled by Babel, but its source map will"+148					" not be accepted by Babel, so it was disabled", filename)149		}150	}151	code, srcMap, err = c.babel.transformImpl(c.logger, src, filename, sourceMapEnabled, inputSrcMap)152	return153}154// Options are options to the compiler155type Options struct {156	CompatibilityMode lib.CompatibilityMode157	SourceMapLoader   func(string) ([]byte, error)158	Strict            bool159}160// compilationState is helper struct to keep the state of a compilation161type compilationState struct {162	// set when we couldn't load external source map so we can try parsing without loading it163	couldntLoadSourceMap bool164	// srcMap is the current full sourceMap that has been generated read so far165	srcMap      []byte166	srcMapError error167	main        bool168	compiler *Compiler169}170// Compile the program in the given CompatibilityMode, wrapping it between pre and post code171func (c *Compiler) Compile(src, filename string, main bool) (*goja.Program, string, error) {172	return c.compileImpl(src, filename, main, c.Options.CompatibilityMode, nil)173}174// sourceMapLoader is to be used with goja's WithSourceMapLoader175// it not only gets the file from disk in the simple case, but also returns it if the map was generated from babel176// additioanlly it fixes off by one error in commonjs dependencies due to having to wrap them in a function.177func (c *compilationState) sourceMapLoader(path string) ([]byte, error) {178	if path == sourceMapURLFromBabel {179		if !c.main {180			return c.increaseMappingsByOne(c.srcMap)181		}182		return c.srcMap, nil183	}184	c.srcMap, c.srcMapError = c.compiler.Options.SourceMapLoader(path)185	if c.srcMapError != nil {186		c.couldntLoadSourceMap = true187		return nil, c.srcMapError188	}189	_, c.srcMapError = sourcemap.Parse(path, c.srcMap)190	if c.srcMapError != nil {191		c.couldntLoadSourceMap = true192		c.srcMap = nil193		return nil, c.srcMapError194	}195	if !c.main {196		return c.increaseMappingsByOne(c.srcMap)197	}198	return c.srcMap, nil199}200func (c *Compiler) compileImpl(201	src, filename string, main bool, compatibilityMode lib.CompatibilityMode, srcMap []byte,202) (*goja.Program, string, error) {203	code := src204	state := compilationState{srcMap: srcMap, compiler: c, main: main}205	if !main { // the lines in the sourcemap (if available) will be fixed by increaseMappingsByOne206		code = "(function(module, exports){\n" + code + "\n})\n"207	}208	opts := parser.WithDisableSourceMaps209	if c.Options.SourceMapLoader != nil {210		opts = parser.WithSourceMapLoader(state.sourceMapLoader)211	}212	ast, err := parser.ParseFile(nil, filename, code, 0, opts)213	if state.couldntLoadSourceMap {214		state.couldntLoadSourceMap = false // reset215		// we probably don't want to abort scripts which have source maps but they can't be found,216		// this also will be a breaking change, so if we couldn't we retry with it disabled217		c.logger.WithError(state.srcMapError).Warnf("Couldn't load source map for %s", filename)218		ast, err = parser.ParseFile(nil, filename, code, 0, parser.WithDisableSourceMaps)219	}220	if err != nil {221		if compatibilityMode == lib.CompatibilityModeExtended {222			code, state.srcMap, err = c.Transform(src, filename, state.srcMap)223			if err != nil {224				return nil, code, err225			}226			// the compatibility mode "decreases" here as we shouldn't transform twice227			return c.compileImpl(code, filename, main, lib.CompatibilityModeBase, state.srcMap)228		}229		return nil, code, err230	}231	pgm, err := goja.CompileAST(ast, c.Options.Strict)232	return pgm, code, err233}234type babel struct {235	vm        *goja.Runtime236	this      goja.Value237	transform goja.Callable238	m         sync.Mutex239}240func newBabel() (*babel, error) {241	onceBabelCode.Do(func() {242		globalBabelCode, globalBabelCodeErr = goja.Compile("<internal/k6/compiler/lib/babel.min.js>", babelSrc, false)243	})244	if globalBabelCodeErr != nil {245		return nil, globalBabelCodeErr246	}247	vm := goja.New()248	_, err := vm.RunProgram(globalBabelCode)249	if err != nil {250		return nil, err251	}252	this := vm.Get("Babel")253	bObj := this.ToObject(vm)254	result := &babel{vm: vm, this: this}255	if err = vm.ExportTo(bObj.Get("transform"), &result.transform); err != nil {256		return nil, err257	}258	return result, err259}260// increaseMappingsByOne increases the lines in the sourcemap by line so that it fixes the case where we need to wrap a261// required file in a function to support/emulate commonjs262func (c *compilationState) increaseMappingsByOne(sourceMap []byte) ([]byte, error) {263	var err error264	m := make(map[string]interface{})265	if err = json.Unmarshal(sourceMap, &m); err != nil {266		return nil, err267	}268	mappings, ok := m["mappings"]269	if !ok {270		// no mappings, no idea what this will do, but just return it as technically we can have sourcemap with sections271		// TODO implement incrementing of `offset` in the sections? to support that case as well272		// see https://sourcemaps.info/spec.html#h.n05z8dfyl3yh273		//274		// TODO (kind of alternatively) drop the newline in the "commonjs" wrapping and have only the first line wrong275		// and drop this whole function276		return sourceMap, nil277	}278	if str, ok := mappings.(string); ok {279		// ';' is the separator between lines so just adding 1 will make all mappings be for the line after which they were280		// originally281		m["mappings"] = ";" + str282	} else {283		// we have mappings but it's not a string - this is some kind of error284		// we still won't abort the test but just not load the sourcemap285		c.couldntLoadSourceMap = true286		return nil, errors.New(`missing "mappings" in sourcemap`)287	}288	return json.Marshal(m)289}290// transformImpl the given code into ES5, while synchronizing to ensure only a single291// bundle instance / Goja VM is in use at a time.292func (b *babel) transformImpl(293	logger logrus.FieldLogger, src, filename string, sourceMapsEnabled bool, inputSrcMap []byte,294) (string, []byte, error) {295	b.m.Lock()296	defer b.m.Unlock()297	opts := make(map[string]interface{})298	for k, v := range DefaultOpts {299		opts[k] = v300	}301	if sourceMapsEnabled {302		// given that the source map should provide accurate lines(and columns), this option isn't needed303		// it also happens to make very long and awkward lines, especially around import/exports and definitely a lot304		// less readable overall. Hopefully it also has some performance improvement not trying to keep the same lines305		opts["retainLines"] = false306		opts["sourceMaps"] = true...

transformImpl

Using AI Code Generation

1import (2type compiler struct {3}4func (c compiler) transformImpl() {5	fmt.Println("transformImpl")6}7func main() {8	c.transformImpl()9}10import (11type compiler struct {12}13func (c compiler) transformImpl() {14	fmt.Println("transformImpl")15}16func main() {17	c.transformImpl()18}19import (20type compiler struct {21}22func (c *compiler) transformImpl() {23	fmt.Println("transformImpl")24}25func main() {26	c.transformImpl()27}28import (29type compiler struct {30}31func (c *compiler) transformImpl() {32	fmt.Println("transformImpl")33}34func main() {35	c.transformImpl()36}37import (38type compiler struct {39}40func (c compiler) transformImpl() {41	fmt.Println("transformImpl")42}43func main() {44	c.transformImpl()45}46import (47type compiler struct {48}49func (c compiler) transformImpl() {50	fmt.Println("transformImpl")51}52func main() {53	c.transformImpl()54}

transformImpl

Using AI Code Generation

1import (2func main() {3	src, err := parser.ParseFile(fset, "test.go", nil, parser.ParseComments)4	if err != nil {5		fmt.Println(err)6		os.Exit(1)7	}8	pretty.Println("ast", src)9	pretty.Println("ast", src.Imports)10	pretty.Println("ast", src.Decls)11	pretty.Println("ast", src.Scope)12	pretty.Println("ast", src.Comments)13	pretty.Println("ast", src.Unresolved)14	pretty.Println("ast", src.Name)15	pretty.Println("ast", src.Doc)16	pretty.Println("ast", src.End())17	pretty.Println("ast", src.Pos())18	pretty.Println("ast", src.TokPos)19	for _, decl := range src.Decls {20		pretty.Println("ast", decl)21		pretty.Println("ast", decl.Pos())22		if decl, ok := decl.(*ast.GenDecl); ok {23			pretty.Println("ast", decl)24			pretty.Println("ast", decl.Doc)25			pretty.Println("ast", decl.Specs)26			pretty.Println("ast", decl.TokPos)27			pretty.Println("ast", decl.Lparen)28			pretty.Println("ast", decl.Rparen)29			pretty.Println("ast", decl.Tok)30			pretty.Println("ast", decl.End())31			pretty.Println("ast", decl.Pos())32		}33		if decl, ok := decl.(*ast.FuncDecl); ok {34			pretty.Println("ast", decl)35			pretty.Println("ast", decl

transformImpl

Using AI Code Generation

1import "fmt"2type compiler struct {3}4func (c *compiler) transformImpl() {5    fmt.Println("transformImpl")6}7type compilerDecorator struct {8}9func (c *compilerDecorator) transformImpl() {10    fmt.Println("before")11    c.compiler.transformImpl()12    fmt.Println("after")13}14func main() {15    c := compiler{target: "target"}16    c.transformImpl()17    d := compilerDecorator{compiler: compiler{target: "target"}}18    d.transformImpl()19}20import "fmt"21type compiler interface {22    transformImpl()23}24type compilerDecorator struct {25}26func (c *compilerDecorator) transformImpl() {27    fmt.Println("before")28    c.compiler.transformImpl()29    fmt.Println("after")30}31type compilerImpl struct {32}33func (c *compilerImpl) transformImpl() {34    fmt.Println("transformImpl")35}36func main() {37    c := compilerImpl{target: "target"}38    c.transformImpl()39    d := compilerDecorator{compiler: compilerImpl{target: "target"}}40    d.transformImpl()41}

transformImpl

Using AI Code Generation

1import (2func main() {3	fset := token.NewFileSet()4	file, err := parser.ParseFile(fset, "stdin", code, 0)5	if err != nil {6		log.Fatal(err)7	}8	comp := types.NewPackage("main", "main")9	comp.MarkComplete()10	compiler := types.NewCompiler(fset, types.Config{Importer: importer{comp}}, comp, nil)11	compiler.TransformFile(file)12	ast.Print(fset, file)13}14type importer struct {15}16func (i importer) Import(path string) (*types.Package, error) {17	if path == "unsafe" {18	}19	return nil, fmt.Errorf("can't import %q", path)20}21func (i importer) ImportFrom(path, srcDir string, mode types.ImportMode) (*types.Package, error) {22	if path == "unsafe" {23	}24	if !strings.HasPrefix(path, "./") {25		return nil, fmt.Errorf("can't import %q", path)26	}27	if srcDir != "." {28		return nil, fmt.Errorf("can't import %q from %q", path, srcDir)29	}30}31import (32func main() {33	fset := token.NewFileSet()34	file, err := parser.ParseFile(fset, "stdin", code, 0)35	if err != nil {36		log.Fatal(err)37	}

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