173 lines
3.4 KiB
Go
173 lines
3.4 KiB
Go
/*
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Serene --- Yet an other Lisp
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Copyright (c) 2020 Sameer Rahmani <lxsameer@gnu.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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// Package core contains the high level internal function of Serene
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package core
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import (
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"bytes"
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"fmt"
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"html/template"
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"os"
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"path/filepath"
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"github.com/chzyer/readline"
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)
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type mainRunner struct {
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NS string
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Args string
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}
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func rep(rt *Runtime, line string) {
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ast, err := ReadString("serene.internal", line)
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if err != nil {
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PrintError(rt, err)
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return
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}
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// Debug data, ugly right ? :))
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if rt.IsDebugMode() {
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fmt.Printf("[DEBUG] Parsed AST: %s\n", ast.String())
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}
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result, e := Eval(rt, ast)
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if e != nil {
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PrintError(rt, e)
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return
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}
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Prn(rt, result)
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}
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/** TODO:
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Replace the readline implementation with go-prompt.
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*/
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// REPL executes a Read Eval Print Loop locally reading from stdin and
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// writing to stdout
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func REPL(flags map[string]bool) {
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cwd, err := os.Getwd()
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if err != nil {
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panic(err)
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}
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rt := MakeRuntime([]string{cwd}, flags)
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rt.CreateNS("user", "REPL", true)
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rl, err := readline.NewEx(&readline.Config{
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Prompt: "> ",
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HistoryFile: filepath.Join(os.Getenv("HOME"), ".serene.history"),
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InterruptPrompt: "^C",
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EOFPrompt: "exit",
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HistorySearchFold: true,
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})
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if err != nil {
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panic(err)
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}
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rl.HistoryEnable()
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defer rl.Close()
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fmt.Println(`
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_______ _______ ______ _______ _______ _______
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| __| ___| __ \ ___| | | ___|
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|__ | ___| < ___| | ___|
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|_______|_______|___|__|_______|__|____|_______|
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Serene's bootstrap interpreter is used to
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bootstrap the Serene's compiler.
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It comes with ABSOLUTELY NO WARRANTY;
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This is free software, and you are welcome
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to redistribute it under certain conditions;
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for details take a look at the LICENSE file.
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`)
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for {
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rl.SetPrompt(fmt.Sprintf("%s> ", rt.CurrentNS().GetName()))
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line, err := rl.Readline()
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if err != nil { // io.EOF
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break
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}
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rep(rt, line)
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}
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}
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func Run(flags map[string]bool, args []string) {
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cwd, e := os.Getwd()
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if e != nil {
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panic(e)
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}
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rt := MakeRuntime([]string{cwd}, flags)
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rt.CreateNS("serene.internal", "RUN", true)
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if len(args) == 0 {
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PrintError(rt, MakePlainError("'run' command needs at least one argument"))
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os.Exit(1)
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}
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var buf bytes.Buffer
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arguments := ""
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ns := args[0]
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if len(args) > 1 {
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for _, arg := range args[1:] {
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arguments += "\"" + arg + "\""
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}
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}
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tmpl, e := template.New("run").Parse(
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`(require '({{.NS}} n))
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(n/main {{.Args}})`,
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)
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if e != nil {
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panic(e)
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}
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e = tmpl.Execute(&buf, &mainRunner{ns, arguments})
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if e != nil {
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panic(e)
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}
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if rt.IsDebugMode() {
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fmt.Println("[DEBUG] Evaluating the following form to run the 'main' fn:")
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fmt.Println(buf.String())
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}
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ast, err := ReadString("serene.internal", buf.String())
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if err != nil {
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PrintError(rt, err)
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os.Exit(1)
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}
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_, err = Eval(rt, ast)
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if err != nil {
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PrintError(rt, err)
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return
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}
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}
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