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api_impl.go
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api_impl.go
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package api
import (
"fmt"
"strings"
"github.com/evanw/esbuild/internal/ast"
"github.com/evanw/esbuild/internal/bundler"
"github.com/evanw/esbuild/internal/fs"
"github.com/evanw/esbuild/internal/lexer"
"github.com/evanw/esbuild/internal/logging"
"github.com/evanw/esbuild/internal/parser"
"github.com/evanw/esbuild/internal/printer"
"github.com/evanw/esbuild/internal/resolver"
)
func validatePlatform(value Platform) parser.Platform {
switch value {
case PlatformBrowser:
return parser.PlatformBrowser
case PlatformNode:
return parser.PlatformNode
default:
panic("Invalid platform")
return ^parser.Platform(0)
}
}
func validateFormat(value Format) printer.Format {
switch value {
case FormatDefault:
return printer.FormatPreserve
case FormatIIFE:
return printer.FormatIIFE
case FormatCommonJS:
return printer.FormatCommonJS
case FormatESModule:
return printer.FormatESModule
default:
panic("Invalid format")
return ^printer.Format(0)
}
}
func validateSourceMap(value SourceMap) bundler.SourceMap {
switch value {
case SourceMapNone:
return bundler.SourceMapNone
case SourceMapLinked:
return bundler.SourceMapLinkedWithComment
case SourceMapInline:
return bundler.SourceMapInline
case SourceMapExternal:
return bundler.SourceMapExternalWithoutComment
default:
panic("Invalid source map")
return ^bundler.SourceMap(0)
}
}
func validateColor(value StderrColor) logging.StderrColor {
switch value {
case ColorIfTerminal:
return logging.ColorIfTerminal
case ColorNever:
return logging.ColorNever
case ColorAlways:
return logging.ColorAlways
default:
panic("Invalid color")
return ^logging.StderrColor(0)
}
}
func validateLogLevel(value LogLevel) logging.LogLevel {
switch value {
case LogLevelInfo:
return logging.LevelInfo
case LogLevelWarning:
return logging.LevelWarning
case LogLevelError:
return logging.LevelError
default:
panic("Invalid log level")
return ^logging.LogLevel(0)
}
}
func validateTarget(value Target) parser.LanguageTarget {
switch value {
case ESNext:
return parser.ESNext
case ES2015:
return parser.ES2015
case ES2016:
return parser.ES2016
case ES2017:
return parser.ES2017
case ES2018:
return parser.ES2018
case ES2019:
return parser.ES2019
case ES2020:
return parser.ES2020
default:
panic("Invalid target")
return ^parser.LanguageTarget(0)
}
}
func validateLoader(value Loader) bundler.Loader {
switch value {
case LoaderJS:
return bundler.LoaderJS
case LoaderJSX:
return bundler.LoaderJSX
case LoaderTS:
return bundler.LoaderTS
case LoaderTSX:
return bundler.LoaderTSX
case LoaderJSON:
return bundler.LoaderJSON
case LoaderText:
return bundler.LoaderText
case LoaderBase64:
return bundler.LoaderBase64
case LoaderDataURL:
return bundler.LoaderDataURL
case LoaderFile:
return bundler.LoaderFile
default:
panic("Invalid loader")
return ^bundler.Loader(0)
}
}
func validateExternals(log logging.Log, paths []string) map[string]bool {
result := make(map[string]bool)
for _, path := range paths {
if resolver.IsNonModulePath(path) {
log.AddError(nil, ast.Loc{}, fmt.Sprintf("Invalid module name: %q", path))
}
result[path] = true
}
return result
}
func validateResolveExtensions(log logging.Log, order []string) []string {
if order == nil {
return []string{".tsx", ".ts", ".jsx", ".mjs", ".cjs", ".js", ".json"}
}
for _, ext := range order {
if len(ext) < 2 || ext[0] != '.' {
log.AddError(nil, ast.Loc{}, fmt.Sprintf("Invalid file extension: %q", ext))
}
}
return order
}
func validateLoaders(log logging.Log, loaders map[string]Loader) map[string]bundler.Loader {
result := bundler.DefaultExtensionToLoaderMap()
if loaders != nil {
for ext, loader := range loaders {
if len(ext) < 2 || ext[0] != '.' || strings.ContainsRune(ext[1:], '.') {
log.AddError(nil, ast.Loc{}, fmt.Sprintf("Invalid file extension: %q", ext))
}
result[ext] = validateLoader(loader)
}
}
return result
}
func validateJSX(log logging.Log, text string, name string) []string {
if text == "" {
return nil
}
parts := strings.Split(text, ".")
for _, part := range parts {
if !lexer.IsIdentifier(part) {
log.AddError(nil, ast.Loc{}, fmt.Sprintf("Invalid JSX %s: %q", name, text))
return nil
}
}
return parts
}
func validateDefines(log logging.Log, defines map[string]string) *parser.ProcessedDefines {
if len(defines) == 0 {
return nil
}
rawDefines := make(map[string]parser.DefineFunc)
for key, value := range defines {
// The key must be a dot-separated identifier list
for _, part := range strings.Split(key, ".") {
if !lexer.IsIdentifier(part) {
log.AddError(nil, ast.Loc{}, fmt.Sprintf("Invalid define key: %q", key))
continue
}
}
// Allow substituting for an identifier
if lexer.IsIdentifier(value) {
if _, ok := lexer.Keywords()[value]; !ok {
name := value // The closure must close over a variable inside the loop
rawDefines[key] = func(findSymbol parser.FindSymbol) ast.E {
return &ast.EIdentifier{findSymbol(name)}
}
continue
}
}
// Parse the value as JSON
valueLog, done := logging.NewDeferLog()
source := logging.Source{Contents: value}
expr, ok := parser.ParseJSON(valueLog, source, parser.ParseJSONOptions{})
done()
if !ok {
log.AddError(nil, ast.Loc{}, fmt.Sprintf("Invalid define value: %q", value))
continue
}
// Only allow atoms for now
var fn parser.DefineFunc
switch e := expr.Data.(type) {
case *ast.ENull:
fn = func(parser.FindSymbol) ast.E { return &ast.ENull{} }
case *ast.EBoolean:
fn = func(parser.FindSymbol) ast.E { return &ast.EBoolean{e.Value} }
case *ast.EString:
fn = func(parser.FindSymbol) ast.E { return &ast.EString{e.Value} }
case *ast.ENumber:
fn = func(parser.FindSymbol) ast.E { return &ast.ENumber{e.Value} }
default:
log.AddError(nil, ast.Loc{}, fmt.Sprintf("Invalid define value: %q", value))
continue
}
rawDefines[key] = fn
}
// Processing defines is expensive. Process them once here so the same object
// can be shared between all parsers we create using these arguments.
processed := parser.ProcessDefines(rawDefines)
return &processed
}
func validatePath(log logging.Log, fs fs.FS, relPath string) string {
if relPath == "" {
return ""
}
absPath, ok := fs.Abs(relPath)
if !ok {
log.AddError(nil, ast.Loc{}, fmt.Sprintf("Invalid path: %s", relPath))
}
return absPath
}
func messagesOfKind(kind logging.MsgKind, msgs []logging.Msg) []Message {
var filtered []Message
for _, msg := range msgs {
if msg.Kind == kind {
var location *Location
if msg.Source != nil {
line, column, _ := logging.ComputeLineAndColumn(msg.Source.Contents[0:msg.Start])
line++
// Extract the line text
lineText := msg.Source.Contents[int(msg.Start)-column:]
endOfLine := len(lineText)
for i, c := range lineText {
if c == '\n' || c == '\r' || c == '\u2028' || c == '\u2029' {
endOfLine = i
break
}
}
lineText = lineText[:endOfLine]
location = &Location{
File: msg.Source.PrettyPath,
Line: line,
Column: column,
Length: int(msg.Length),
LineText: lineText,
}
}
filtered = append(filtered, Message{
Text: msg.Text,
Location: location,
})
}
}
return filtered
}
////////////////////////////////////////////////////////////////////////////////
// Build API
func buildImpl(options BuildOptions) BuildResult {
newLog := func() (logging.Log, func() []logging.Msg) {
if options.LogLevel == LogLevelSilent {
return logging.NewDeferLog()
}
return logging.NewStderrLog(logging.StderrOptions{
IncludeSource: true,
ErrorLimit: options.ErrorLimit,
Color: validateColor(options.Color),
LogLevel: validateLogLevel(options.LogLevel),
})
}
// Convert and validate the options
realFS := fs.RealFS()
validateLog, validateJoin := newLog()
parseOptions := parser.ParseOptions{
Target: validateTarget(options.Target),
MangleSyntax: options.MinifySyntax,
JSX: parser.JSXOptions{
Factory: validateJSX(validateLog, options.JSXFactory, "factory"),
Fragment: validateJSX(validateLog, options.JSXFragment, "fragment"),
},
Defines: validateDefines(validateLog, options.Defines),
Platform: validatePlatform(options.Platform),
IsBundling: options.Bundle,
}
bundleOptions := bundler.BundleOptions{
SourceMap: validateSourceMap(options.Sourcemap),
MangleSyntax: options.MinifySyntax,
RemoveWhitespace: options.MinifyWhitespace,
MinifyIdentifiers: options.MinifyIdentifiers,
ModuleName: options.GlobalName,
IsBundling: options.Bundle,
OutputFormat: validateFormat(options.Format),
AbsOutputFile: validatePath(validateLog, realFS, options.Outfile),
AbsOutputDir: validatePath(validateLog, realFS, options.Outdir),
AbsMetadataFile: validatePath(validateLog, realFS, options.Metafile),
ExtensionToLoader: validateLoaders(validateLog, options.Loaders),
}
resolveOptions := resolver.ResolveOptions{
Platform: validatePlatform(options.Platform),
ExtensionOrder: validateResolveExtensions(validateLog, options.ResolveExtensions),
ExternalModules: validateExternals(validateLog, options.Externals),
}
entryPaths := make([]string, len(options.EntryPoints))
for i, entryPoint := range options.EntryPoints {
entryPaths[i] = validatePath(validateLog, realFS, entryPoint)
}
if bundleOptions.AbsOutputDir == "" && len(entryPaths) > 1 {
validateLog.AddError(nil, ast.Loc{},
"Must use \"outdir\" when there are multiple input files")
} else if bundleOptions.AbsOutputFile != "" && bundleOptions.AbsOutputDir != "" {
validateLog.AddError(nil, ast.Loc{}, "Cannot use both \"outfile\" and \"outdir\"")
} else if bundleOptions.AbsOutputFile != "" {
// If the output file is specified, use it to derive the output directory
bundleOptions.AbsOutputDir = realFS.Dir(bundleOptions.AbsOutputFile)
} else if bundleOptions.AbsOutputDir == "" {
// Forbid certain features when writing to stdout
if bundleOptions.SourceMap != bundler.SourceMapNone && bundleOptions.SourceMap != bundler.SourceMapInline {
validateLog.AddError(nil, ast.Loc{}, "Cannot use an external source map without an output path")
}
if bundleOptions.AbsMetadataFile != "" {
validateLog.AddError(nil, ast.Loc{}, "Cannot use \"metafile\" without an output path")
}
for _, loader := range bundleOptions.ExtensionToLoader {
if loader == bundler.LoaderFile {
validateLog.AddError(nil, ast.Loc{}, "Cannot use the \"file\" loader without an output path")
break
}
}
}
if !bundleOptions.IsBundling {
// Disallow bundle-only options when not bundling
if bundleOptions.OutputFormat != printer.FormatPreserve {
validateLog.AddError(nil, ast.Loc{}, "Cannot use \"format\" without \"bundle\"")
}
if len(resolveOptions.ExternalModules) > 0 {
validateLog.AddError(nil, ast.Loc{}, "Cannot use \"external\" without \"bundle\"")
}
} else if bundleOptions.OutputFormat == printer.FormatPreserve {
// If the format isn't specified, set the default format using the platform
switch resolveOptions.Platform {
case parser.PlatformBrowser:
bundleOptions.OutputFormat = printer.FormatIIFE
case parser.PlatformNode:
bundleOptions.OutputFormat = printer.FormatCommonJS
}
}
// Stop now if there were errors
validateMsgs := validateJoin()
validateErrors := messagesOfKind(logging.Error, validateMsgs)
if len(validateErrors) > 0 {
return BuildResult{
Errors: validateErrors,
Warnings: messagesOfKind(logging.Warning, validateMsgs),
}
}
// Scan over the bundle
scanLog, scanJoin := newLog()
resolver := resolver.NewResolver(realFS, scanLog, resolveOptions)
bundle := bundler.ScanBundle(scanLog, realFS, resolver, entryPaths, parseOptions, bundleOptions)
// Stop now if there were errors
scanMsgs := scanJoin()
scanErrors := messagesOfKind(logging.Error, scanMsgs)
if len(scanErrors) > 0 {
return BuildResult{
Errors: scanErrors,
Warnings: append(
messagesOfKind(logging.Warning, validateMsgs),
messagesOfKind(logging.Warning, scanMsgs)...),
}
}
// Compile the bundle
compileLog, compileJoin := newLog()
results := bundle.Compile(compileLog, bundleOptions)
// Return the results
compileMsgs := compileJoin()
outputFiles := make([]OutputFile, len(results))
for i, result := range results {
outputFiles[i] = OutputFile{
Path: result.AbsPath,
Contents: result.Contents,
}
}
return BuildResult{
Errors: messagesOfKind(logging.Error, compileMsgs),
Warnings: append(append(
messagesOfKind(logging.Warning, validateMsgs),
messagesOfKind(logging.Warning, scanMsgs)...),
messagesOfKind(logging.Warning, compileMsgs)...),
OutputFiles: outputFiles,
}
}
////////////////////////////////////////////////////////////////////////////////
// Transform API
func transformImpl(input string, options TransformOptions) TransformResult {
newLog := func() (logging.Log, func() []logging.Msg) {
if options.LogLevel == LogLevelSilent {
return logging.NewDeferLog()
}
return logging.NewStderrLog(logging.StderrOptions{
IncludeSource: true,
ErrorLimit: options.ErrorLimit,
Color: validateColor(options.Color),
LogLevel: validateLogLevel(options.LogLevel),
})
}
// Convert and validate the options
validateLog, validateJoin := newLog()
parseOptions := parser.ParseOptions{
Target: validateTarget(options.Target),
MangleSyntax: options.MinifySyntax,
JSX: parser.JSXOptions{
Factory: validateJSX(validateLog, options.JSXFactory, "factory"),
Fragment: validateJSX(validateLog, options.JSXFragment, "fragment"),
},
Defines: validateDefines(validateLog, options.Defines),
}
bundleOptions := bundler.BundleOptions{
SourceMap: validateSourceMap(options.Sourcemap),
MangleSyntax: options.MinifySyntax,
RemoveWhitespace: options.MinifyWhitespace,
MinifyIdentifiers: options.MinifyIdentifiers,
AbsOutputFile: options.Sourcefile + "-out",
Stdin: &bundler.StdinInfo{
Loader: validateLoader(options.Loader),
Contents: input,
SourceFile: options.Sourcefile,
},
}
if bundleOptions.SourceMap == bundler.SourceMapLinkedWithComment {
// Linked source maps don't make sense because there's no output file name
validateLog.AddError(nil, ast.Loc{}, "Cannot transform with linked source maps")
}
if bundleOptions.SourceMap != bundler.SourceMapNone && bundleOptions.Stdin.SourceFile == "" {
validateLog.AddError(nil, ast.Loc{},
"Must use \"sourcefile\" with \"sourcemap\" to set the original file name")
}
// Stop now if there were errors
validateMsgs := validateJoin()
validateErrors := messagesOfKind(logging.Error, validateMsgs)
if len(validateErrors) > 0 {
return TransformResult{
Errors: validateErrors,
Warnings: messagesOfKind(logging.Warning, validateMsgs),
}
}
// Scan over the bundle
scanLog, scanJoin := newLog()
mockFS := fs.MockFS(map[string]string{options.Sourcefile: input})
resolver := resolver.NewResolver(mockFS, scanLog, resolver.ResolveOptions{})
bundle := bundler.ScanBundle(scanLog, mockFS, resolver, []string{options.Sourcefile}, parseOptions, bundleOptions)
// Stop now if there were errors
scanMsgs := scanJoin()
scanErrors := messagesOfKind(logging.Error, scanMsgs)
if len(scanErrors) > 0 {
return TransformResult{
Errors: scanErrors,
Warnings: append(
messagesOfKind(logging.Warning, validateMsgs),
messagesOfKind(logging.Warning, scanMsgs)...),
}
}
// Compile the bundle
compileLog, compileJoin := newLog()
results := bundle.Compile(compileLog, bundleOptions)
// Return the results
compileMsgs := compileJoin()
var js []byte
var jsSourceMap []byte
// Unpack the JavaScript file and the source map file
if len(results) == 1 {
js = results[0].Contents
} else if len(results) == 2 {
a, b := results[0], results[1]
if a.AbsPath == b.AbsPath+".map" {
jsSourceMap, js = a.Contents, b.Contents
} else if a.AbsPath+".map" == b.AbsPath {
js, jsSourceMap = a.Contents, b.Contents
}
}
return TransformResult{
Errors: messagesOfKind(logging.Error, compileMsgs),
Warnings: append(append(
messagesOfKind(logging.Warning, validateMsgs),
messagesOfKind(logging.Warning, scanMsgs)...),
messagesOfKind(logging.Warning, compileMsgs)...),
JS: js,
JSSourceMap: jsSourceMap,
}
}