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path: root/cmd/ethereum/repl/repl.go
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// Copyright (c) 2013-2014, Jeffrey Wilcke. All rights reserved.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
// MA 02110-1301  USA

package ethrepl

import (
    "bufio"
    "fmt"
    "io"
    "os"
    "path"

    "github.com/ethereum/go-ethereum/eth"
    "github.com/ethereum/go-ethereum/ethutil"
    "github.com/ethereum/go-ethereum/javascript"
    "github.com/ethereum/go-ethereum/logger"
)

var repllogger = logger.NewLogger("REPL")

type Repl interface {
    Start()
    Stop()
}

type JSRepl struct {
    re *javascript.JSRE

    prompt string

    history *os.File

    running bool
}

func NewJSRepl(ethereum *eth.Ethereum) *JSRepl {
    hist, err := os.OpenFile(path.Join(ethutil.Config.ExecPath, "history"), os.O_RDWR|os.O_CREATE, os.ModePerm)
    if err != nil {
        panic(err)
    }

    return &JSRepl{re: javascript.NewJSRE(ethereum), prompt: "> ", history: hist}
}

func (self *JSRepl) Start() {
    if !self.running {
        self.running = true
        repllogger.Infoln("init JS Console")
        reader := bufio.NewReader(self.history)
        for {
            line, err := reader.ReadString('\n')
            if err != nil && err == io.EOF {
                break
            } else if err != nil {
                fmt.Println("error reading history", err)
                break
            }

            addHistory(line[:len(line)-1])
        }
        self.read()
    }
}

func (self *JSRepl) Stop() {
    if self.running {
        self.running = false
        self.re.Stop()
        repllogger.Infoln("exit JS Console")
        self.history.Close()
    }
}

func (self *JSRepl) parseInput(code string) {
    defer func() {
        if r := recover(); r != nil {
            fmt.Println("[native] error", r)
        }
    }()

    value, err := self.re.Run(code)
    if err != nil {
        fmt.Println(err)
        return
    }

    self.PrintValue(value)
}