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113 lines
2.6 KiB
113 lines
2.6 KiB
/*
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This file is part of cpp-ethereum.
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cpp-ethereum 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 3 of the License, or
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(at your option) any later version.
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cpp-ethereum 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 cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file JSConsole.h
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* @author Marek Kotewicz <marek@ethdev.com>
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* @date 2015
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* Ethereum client.
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*/
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#pragma once
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#include <libdevcore/Log.h>
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#if ETH_READLINE
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#include <readline/readline.h>
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#include <readline/history.h>
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#endif
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namespace dev
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{
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namespace eth
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{
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template<typename Engine, typename Printer>
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class JSConsole
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{
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public:
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JSConsole(): m_engine(Engine()), m_printer(Printer(m_engine)) {}
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~JSConsole() {}
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void readExpression() const
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{
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std::string cmd = "";
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g_logPost = [](std::string const& a, char const*)
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{
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std::cout << "\r \r" << a << std::endl << std::flush;
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#if ETH_READLINE
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rl_forced_update_display();
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#endif
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};
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bool isEmpty = true;
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int openBrackets = 0;
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do {
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std::string rl;
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#if ETH_READLINE
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char* buff = readline(promptForIndentionLevel(openBrackets).c_str());
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if (buff)
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{
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rl = std::string(buff);
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free(buff);
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}
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#else
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std::cout << promptForIndentionLevel(openBrackets) << std::flush;
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std::getline(std::cin, rl);
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#endif
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isEmpty = rl.empty();
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//@todo this should eventually check the structure of the input, since unmatched
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// brackets in strings will fail to execute the input now.
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if (!isEmpty)
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{
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cmd += rl;
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int open = 0;
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for (char c: {'{', '[', '('})
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open += std::count(cmd.begin(), cmd.end(), c);
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int closed = 0;
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for (char c: {'}', ']', ')'})
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closed += std::count(cmd.begin(), cmd.end(), c);
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openBrackets = open - closed;
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}
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} while (openBrackets > 0);
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if (!isEmpty)
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{
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#if ETH_READLINE
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add_history(cmd.c_str());
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#endif
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auto value = m_engine.eval(cmd.c_str());
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std::string result = m_printer.prettyPrint(value).cstr();
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std::cout << result << std::endl;
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}
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}
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void eval(std::string const& _expression) { m_engine.eval(_expression.c_str()); }
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protected:
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Engine m_engine;
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Printer m_printer;
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virtual std::string promptForIndentionLevel(int _i) const
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{
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if (_i == 0)
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return "> ";
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return std::string((_i + 1) * 2, ' ');
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}
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};
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}
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}
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