dc15dc32bb
git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@1052740 13f79535-47bb-0310-9956-ffa450edef68
91 lines
3 KiB
C++
91 lines
3 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_modscheme_hpp
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#define tuscany_modscheme_hpp
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/**
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* Evaluation functions used by mod-eval to evaluate Scheme
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* component implementations.
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*/
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#include "string.hpp"
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#include "stream.hpp"
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#include "function.hpp"
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#include "list.hpp"
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#include "value.hpp"
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#include "monad.hpp"
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#include "../scheme/eval.hpp"
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namespace tuscany {
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namespace server {
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namespace modscheme {
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/**
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* Convert proxy lambdas to evaluator primitive procedures.
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*/
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const list<value> primitiveProcedures(const list<value>& l) {
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if (isNil(l))
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return l;
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return cons<value>(mklist<value>(scheme::primitiveSymbol, car(l)), primitiveProcedures(cdr(l)));
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}
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/**
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* Apply a Scheme component implementation function.
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*/
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struct applyImplementation {
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const value impl;
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const list<value> px;
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applyImplementation(const value& impl, const list<value>& px) : impl(impl), px(scheme::quotedParameters(primitiveProcedures(px))) {
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}
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const value operator()(const list<value>& params) const {
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const value expr = cons<value>(car(params), append(scheme::quotedParameters(cdr(params)), px));
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debug(expr, "modeval::scheme::applyImplementation::input");
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scheme::Env env = scheme::setupEnvironment();
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const value res = scheme::evalScript(expr, impl, env);
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const value val = isNil(res)? mklist<value>(value(), string("Could not evaluate expression")) : mklist<value>(res);
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debug(val, "modeval::scheme::applyImplementation::result");
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return val;
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}
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};
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/**
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* Evaluate a Scheme component implementation and convert it to an
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* applicable lambda function.
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*/
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const failable<lambda<value(const list<value>&)> > evalImplementation(const string& path, const value& impl, const list<value>& px) {
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const string fpath(path + attributeValue("script", impl));
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ifstream is(fpath);
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if (fail(is))
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return mkfailure<lambda<value(const list<value>&)> >(string("Could not read implementation: ") + fpath);
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const value script = scheme::readScript(is);
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if (isNil(script))
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return mkfailure<lambda<value(const list<value>&)> >(string("Could not read implementation: ") + fpath);
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return lambda<value(const list<value>&)>(applyImplementation(script, px));
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}
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}
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}
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}
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#endif /* tuscany_modscheme_hpp */
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