dc15dc32bb
git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@1052740 13f79535-47bb-0310-9956-ffa450edef68
76 lines
2.1 KiB
C++
76 lines
2.1 KiB
C++
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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/* $Rev$ $Date$ */
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#ifndef tuscany_scheme_driver_hpp
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#define tuscany_scheme_driver_hpp
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/**
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* Script evaluator main driver loop.
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*/
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#include "string.hpp"
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#include "stream.hpp"
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#include "eval.hpp"
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namespace tuscany {
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namespace scheme {
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const string evalOutputPrompt("; ");
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const string evalInputPrompt("=> ");
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const bool promptForInput(const string& str, ostream& out) {
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out << endl << endl << str;
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return true;
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}
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const bool announceOutput(const string str, ostream& out) {
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out << endl << str;
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return true;
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}
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const bool userPrint(const value val, ostream& out) {
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if(isCompoundProcedure(val))
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writeValue(mklist<value>(compoundProcedureSymbol, procedureParameters(val), procedureBody(val), "<procedure-env>"), out);
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writeValue(val, out);
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return true;
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}
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const value evalDriverLoop(istream& in, ostream& out, Env& env) {
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promptForInput(evalInputPrompt, out);
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value input = readValue(in);
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if (isNil(input))
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return input;
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const value output = evalExpr(input, env);
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announceOutput(evalOutputPrompt, out);
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userPrint(output, out);
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return evalDriverLoop(in, out, env);
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}
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const bool evalDriverRun(istream& in, ostream& out) {
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setupDisplay(out);
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Env env = setupEnvironment();
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evalDriverLoop(in, out, env);
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return true;
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}
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}
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}
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#endif /* tuscany_scheme_driver_hpp */
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