ff12404062
git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@885349 13f79535-47bb-0310-9956-ffa450edef68
104 lines
3.4 KiB
C++
104 lines
3.4 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_modscm_hpp
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#define tuscany_modscm_hpp
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/**
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* Evaluation functions used by mod-eval to evaluate implementation.scheme
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* component implementations.
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*/
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#include <string>
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#include <iostream>
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#include <fstream>
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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 "debug.hpp"
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#include "monad.hpp"
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#include "cache.hpp"
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#include "../eval/primitive.hpp"
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#include "../eval/driver.hpp"
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#include "../http/httpd.hpp"
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#include "mod-eval.hpp"
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namespace tuscany {
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namespace server {
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namespace modeval {
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namespace scm {
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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>(eval::primitiveSymbol, car(l)), primitiveProcedures(cdr(l)));
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}
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/**
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* Evaluate a script component implementation function.
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*/
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struct evalImplementation {
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const value impl;
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const list<value> px;
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evalImplementation(const value& impl, const list<value>& px) : impl(impl), px(eval::quotedParameters(primitiveProcedures(px))) {
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}
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const failable<value, std::string> operator()(const value& func, const list<value>& params) const {
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const value expr = cons<value>(func, append(eval::quotedParameters(params), px));
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debug(expr, "modeval::scm::evalImplementation::input");
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gc_pool pool;
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eval::Env globalEnv = eval::setupEnvironment(pool);
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const value val = eval::evalScript(expr, impl, globalEnv, pool);
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debug(val, "modeval::scm::evalImplementation::result");
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if (isNil(val))
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return mkfailure<value, std::string>("Could not evaluate expression");
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return val;
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}
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};
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/**
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* Read a script component implementation.
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*/
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const failable<ilambda, std::string> readLatestImplementation(const std::string path, const list<value>& px) {
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std::ifstream is(path.c_str(), std::ios_base::in);
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if (is.fail() || is.bad())
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return mkfailure<ilambda, std::string>("Could not read implementation: " + path);
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const value impl = eval::readScript(is);
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if (isNil(impl))
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return mkfailure<ilambda, std::string>("Could not read implementation: " + path);
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return ilambda(evalImplementation(impl, px));
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}
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const cached<failable<ilambda, std::string> > readImplementation(const std::string& path, const list<value>& px) {
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const lambda<failable<ilambda, std::string>(std::string, list<value>)> ri(readLatestImplementation);
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const lambda<unsigned long(std::string)> ft(latestFileTime);
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return cached<failable<ilambda, std::string> >(curry(ri, path, px), curry(ft, path));
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}
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}
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}
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}
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}
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#endif /* tuscany_modscm_hpp */
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