| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| /* $Rev$ $Date$ */ |
| |
| #ifndef tuscany_modscheme_hpp |
| #define tuscany_modscheme_hpp |
| |
| /** |
| * Evaluation functions used by mod-eval to evaluate Scheme |
| * component implementations. |
| */ |
| |
| #include "string.hpp" |
| #include "stream.hpp" |
| #include "function.hpp" |
| #include "list.hpp" |
| #include "value.hpp" |
| #include "monad.hpp" |
| #include "../scheme/eval.hpp" |
| |
| namespace tuscany { |
| namespace server { |
| namespace modscheme { |
| |
| /** |
| * Convert proxy lambdas to evaluator primitive procedures. |
| */ |
| const list<value> primitiveProcedures(const list<value>& l) { |
| if (isNull(l)) |
| return l; |
| return cons<value>(mklist<value>(scheme::primitiveSymbol, car(l)), primitiveProcedures(cdr(l))); |
| } |
| |
| /** |
| * Evaluate a Scheme component implementation and convert it to an |
| * applicable lambda function. |
| */ |
| const failable<lvvlambda > evalImplementation(const string& path, const value& impl, const list<value>& px) { |
| const string fpath(path + (string)attributeValue("script", impl)); |
| ifstream is(fpath); |
| if (fail(is)) |
| return mkfailure<lvvlambda >(string("Could not read implementation: ") + fpath); |
| const value script = scheme::readScript(is); |
| if (isNull(script)) |
| return mkfailure<lvvlambda >(string("Could not read implementation: ") + fpath); |
| const list<value> pxproc = scheme::quotedParameters(primitiveProcedures(px)); |
| |
| const lvvlambda applyImplementation = [script, pxproc](const list<value>& params) -> const value { |
| // Apply a Scheme component implementation function |
| const value expr = cons<value>(car(params), append(scheme::quotedParameters(cdr(params)), pxproc)); |
| debug(expr, "modeval::scheme::applyImplementation::input"); |
| scheme::Env env = scheme::setupEnvironment(); |
| const value res = scheme::evalScript(expr, script, env); |
| const value val = isNull(res)? mklist<value>(nilValue, string("Could not evaluate expression")) : mklist<value>(res); |
| debug(val, "modeval::scheme::applyImplementation::result"); |
| return val; |
| }; |
| return applyImplementation; |
| } |
| |
| } |
| } |
| } |
| |
| #endif /* tuscany_modscheme_hpp */ |