331 lines
7.2 KiB
Go
331 lines
7.2 KiB
Go
package xtool
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import (
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"bufio"
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"bytes"
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//"flag"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"path/filepath"
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"strings"
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"github.com/d5/tengo/v2"
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"github.com/d5/tengo/v2/parser"
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"github.com/d5/tengo/v2/stdlib"
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)
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import "surdeus.su/core/cli/mtool"
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import "surdeus.su/core/xgo/cjson"
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const (
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sourceFileExt = ".xgo"
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replPrompt = ">> "
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)
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var (
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compileOutput string
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showHelp bool
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showVersion bool
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resolvePath bool // TODO Remove this flag at version 3
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version = "dev"
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iargs []string
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)
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var Tool = mtool.T("xgo").Func(Run)
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func Run(flags *mtool.Flags) {
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flags.BoolVar(&showHelp, "help", false, "Show help")
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flags.StringVar(&compileOutput, "o", "",
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"Compile output file")
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flags.BoolVar(&showVersion, "version", false, "Show version")
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flags.BoolVar(&resolvePath, "resolve", false,
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"Resolve relative import paths")
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iargs := flags.Parse()
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if showHelp {
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doHelp()
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os.Exit(2)
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} else if showVersion {
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fmt.Println(version)
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return
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}
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modules := stdlib.GetModuleMap(stdlib.AllModuleNames()...)
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modules.AddBuiltinModule("cjson", cjson.Module)
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if len(iargs) == 0 {
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// REPL
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RunREPL(modules, os.Stdin, os.Stdout)
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return
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}
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inputFile := iargs[0]
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inputData, err := ioutil.ReadFile(inputFile)
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if err != nil {
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_, _ = fmt.Fprintf(os.Stderr,
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"Error reading input file: %s\n", err.Error())
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os.Exit(1)
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}
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inputFile, err = filepath.Abs(inputFile)
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if err != nil {
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_, _ = fmt.Fprintf(os.Stderr, "Error file path: %s\n", err)
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os.Exit(1)
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}
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if len(inputData) > 1 && string(inputData[:2]) == "#!" {
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copy(inputData, "//")
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}
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if compileOutput != "" {
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err := CompileOnly(modules, inputData, inputFile,
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compileOutput)
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if err != nil {
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_, _ = fmt.Fprintln(os.Stderr, err.Error())
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os.Exit(1)
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}
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} else if filepath.Ext(inputFile) == sourceFileExt {
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err := CompileAndRun(modules, inputData, inputFile)
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if err != nil {
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_, _ = fmt.Fprintln(os.Stderr, err.Error())
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os.Exit(1)
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}
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} else {
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if err := RunCompiled(modules, inputData); err != nil {
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_, _ = fmt.Fprintln(os.Stderr, err.Error())
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os.Exit(1)
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}
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}
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}
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// CompileOnly compiles the source code and writes the compiled binary into
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// outputFile.
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func CompileOnly(
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modules *tengo.ModuleMap,
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data []byte,
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inputFile, outputFile string,
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) (err error) {
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bytecode, err := compileSrc(modules, data, inputFile)
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if err != nil {
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return
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}
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if outputFile == "" {
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outputFile = basename(inputFile) + ".out"
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}
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out, err := os.OpenFile(outputFile, os.O_CREATE|os.O_WRONLY, os.ModePerm)
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if err != nil {
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return
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}
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defer func() {
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if err != nil {
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_ = out.Close()
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} else {
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err = out.Close()
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}
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}()
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err = bytecode.Encode(out)
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if err != nil {
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return
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}
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fmt.Println(outputFile)
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return
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}
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// CompileAndRun compiles the source code and executes it.
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func CompileAndRun(
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modules *tengo.ModuleMap,
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data []byte,
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inputFile string,
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) (err error) {
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bytecode, err := compileSrc(modules, data, inputFile)
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if err != nil {
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return
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}
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machine := tengo.NewVM(bytecode, nil, -1)
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err = machine.Run()
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return
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}
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// RunCompiled reads the compiled binary from file and executes it.
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func RunCompiled(modules *tengo.ModuleMap, data []byte) (err error) {
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bytecode := &tengo.Bytecode{}
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err = bytecode.Decode(bytes.NewReader(data), modules)
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if err != nil {
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return
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}
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machine := tengo.NewVM(bytecode, nil, -1)
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err = machine.Run()
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return
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}
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// RunREPL starts REPL.
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func RunREPL(modules *tengo.ModuleMap, in io.Reader, out io.Writer) {
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stdin := bufio.NewScanner(in)
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fileSet := parser.NewFileSet()
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globals := make([]tengo.Object, tengo.GlobalsSize)
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symbolTable := tengo.NewSymbolTable()
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for idx, fn := range tengo.GetAllBuiltinFunctions() {
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symbolTable.DefineBuiltin(idx, fn.Name)
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}
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// embed println function
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symbol := symbolTable.Define("__repl_println__")
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globals[symbol.Index] = &tengo.UserFunction{
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Name: "println",
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Value: func(args ...tengo.Object) (ret tengo.Object, err error) {
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var printArgs []interface{}
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for _, arg := range args {
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if _, isUndefined := arg.(*tengo.Undefined); isUndefined {
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printArgs = append(printArgs, "<undefined>")
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} else {
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s, _ := tengo.ToString(arg)
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printArgs = append(printArgs, s)
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}
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}
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printArgs = append(printArgs, "\n")
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_, _ = fmt.Print(printArgs...)
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return
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},
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}
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var constants []tengo.Object
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for {
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_, _ = fmt.Fprint(out, replPrompt)
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scanned := stdin.Scan()
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if !scanned {
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return
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}
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line := stdin.Text()
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srcFile := fileSet.AddFile("repl", -1, len(line))
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p := parser.NewParser(srcFile, []byte(line), nil)
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file, err := p.ParseFile()
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if err != nil {
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_, _ = fmt.Fprintln(out, err.Error())
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continue
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}
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file = addPrints(file)
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c := tengo.NewCompiler(srcFile, symbolTable, constants, modules, nil)
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if err := c.Compile(file); err != nil {
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_, _ = fmt.Fprintln(out, err.Error())
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continue
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}
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bytecode := c.Bytecode()
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machine := tengo.NewVM(bytecode, globals, -1)
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if err := machine.Run(); err != nil {
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_, _ = fmt.Fprintln(out, err.Error())
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continue
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}
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constants = bytecode.Constants
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}
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}
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func compileSrc(
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modules *tengo.ModuleMap,
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src []byte,
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inputFile string,
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) (*tengo.Bytecode, error) {
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fileSet := parser.NewFileSet()
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srcFile := fileSet.AddFile(filepath.Base(inputFile), -1, len(src))
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p := parser.NewParser(srcFile, src, nil)
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file, err := p.ParseFile()
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if err != nil {
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return nil, err
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}
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c := tengo.NewCompiler(srcFile, nil, nil, modules, nil)
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c.EnableFileImport(true)
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if resolvePath {
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c.SetImportDir(filepath.Dir(inputFile))
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}
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if err := c.Compile(file); err != nil {
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return nil, err
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}
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bytecode := c.Bytecode()
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bytecode.RemoveDuplicates()
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return bytecode, nil
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}
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func doHelp() {
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fmt.Println("Usage:")
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fmt.Println()
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fmt.Println(" tengo [flags] {input-file}")
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fmt.Println()
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fmt.Println("Flags:")
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fmt.Println()
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fmt.Println(" -o compile output file")
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fmt.Println(" -version show version")
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fmt.Println()
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fmt.Println("Examples:")
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fmt.Println()
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fmt.Println(" tengo")
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fmt.Println()
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fmt.Println(" Start Tengo REPL")
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fmt.Println()
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fmt.Println(" tengo myapp.tengo")
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fmt.Println()
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fmt.Println(" Compile and run source file (myapp.tengo)")
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fmt.Println(" Source file must have .tengo extension")
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fmt.Println()
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fmt.Println(" tengo -o myapp myapp.tengo")
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fmt.Println()
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fmt.Println(" Compile source file (myapp.tengo) into bytecode file (myapp)")
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fmt.Println()
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fmt.Println(" tengo myapp")
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fmt.Println()
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fmt.Println(" Run bytecode file (myapp)")
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fmt.Println()
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fmt.Println()
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}
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func addPrints(file *parser.File) *parser.File {
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var stmts []parser.Stmt
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for _, s := range file.Stmts {
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switch s := s.(type) {
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case *parser.ExprStmt:
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stmts = append(stmts, &parser.ExprStmt{
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Expr: &parser.CallExpr{
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Func: &parser.Ident{Name: "__repl_println__"},
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Args: []parser.Expr{s.Expr},
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},
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})
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case *parser.AssignStmt:
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stmts = append(stmts, s)
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stmts = append(stmts, &parser.ExprStmt{
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Expr: &parser.CallExpr{
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Func: &parser.Ident{
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Name: "__repl_println__",
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},
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Args: s.LHS,
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},
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})
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default:
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stmts = append(stmts, s)
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}
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}
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return &parser.File{
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InputFile: file.InputFile,
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Stmts: stmts,
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}
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}
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func basename(s string) string {
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s = filepath.Base(s)
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n := strings.LastIndexByte(s, '.')
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if n > 0 {
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return s[:n]
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}
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return s
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}
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