SLLanguage.java

/*
 * Copyright (c) 2012, 2016, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
 * freely licensable by each licensor hereunder covering either (i) the
 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
 *
 * (a) the Software, and
 *
 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
 *
 * without restriction, including without limitation the rights to copy, create
 * derivative works of, display, perform, and distribute the Software and make,
 * use, sell, offer for sale, import, export, have made, and have sold the
 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
 *
 * This license is subject to the following condition:
 *
 * The above copyright notice and either this complete permission notice or at a
 * minimum a reference to the UPL must be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package com.oracle.truffle.sl;

import java.util.Map;

import com.oracle.truffle.api.CallTarget;
import com.oracle.truffle.api.Truffle;
import com.oracle.truffle.api.TruffleLanguage;
import com.oracle.truffle.api.debug.DebuggerTags;
import com.oracle.truffle.api.frame.Frame;
import com.oracle.truffle.api.instrumentation.ProvidedTags;
import com.oracle.truffle.api.instrumentation.StandardTags;
import com.oracle.truffle.api.metadata.ScopeProvider;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.source.Source;
import com.oracle.truffle.api.source.SourceSection;
import com.oracle.truffle.sl.nodes.SLEvalRootNode;
import com.oracle.truffle.sl.nodes.SLRootNode;
import com.oracle.truffle.sl.nodes.local.SLLexicalScope;
import com.oracle.truffle.sl.parser.Parser;
import com.oracle.truffle.sl.runtime.SLBigNumber;
import com.oracle.truffle.sl.runtime.SLContext;
import com.oracle.truffle.sl.runtime.SLFunction;
import com.oracle.truffle.sl.runtime.SLNull;

@TruffleLanguage.Registration(name = "SL", version = "0.12", mimeType = SLLanguage.MIME_TYPE)
@ProvidedTags({StandardTags.CallTag.class, StandardTags.StatementTag.class, StandardTags.RootTag.class, DebuggerTags.AlwaysHalt.class})
public final class SLLanguage extends TruffleLanguage<SLContext> implements ScopeProvider<SLContext> {
    public static volatile int counter;

    public static final String MIME_TYPE = "application/x-sl";

    public SLLanguage() {
        counter++;
    }

    @Override
    protected SLContext createContext(Env env) {
        return new SLContext(this, env);
    }

    @Override
    protected CallTarget parse(ParsingRequest request) throws Exception {
        Source source = request.getSource();
        Map<String, SLRootNode> functions;
        /*
         * Parse the provided source. At this point, we do not have a SLContext yet. Registration of
         * the functions with the SLContext happens lazily in SLEvalRootNode.
         */
        if (request.getArgumentNames().isEmpty()) {
            functions = Parser.parseSL(this, source);
        } else {
            StringBuilder sb = new StringBuilder();
            sb.append("function main(");
            String sep = "";
            for (String argumentName : request.getArgumentNames()) {
                sb.append(sep);
                sb.append(argumentName);
                sep = ",";
            }
            sb.append(") { return ");
            sb.append(request.getSource().getCode());
            sb.append(";}");
            Source decoratedSource = Source.newBuilder(sb.toString()).mimeType(request.getSource().getMimeType()).name(request.getSource().getName()).build();
            functions = Parser.parseSL(this, decoratedSource);
        }

        SLRootNode main = functions.get("main");
        SLRootNode evalMain;
        if (main != null) {
            /*
             * We have a main function, so "evaluating" the parsed source means invoking that main
             * function. However, we need to lazily register functions into the SLContext first, so
             * we cannot use the original SLRootNode for the main function. Instead, we create a new
             * SLEvalRootNode that does everything we need.
             */
            evalMain = new SLEvalRootNode(this, main.getFrameDescriptor(), main.getBodyNode(), main.getSourceSection(), main.getName(), functions);
        } else {
            /*
             * Even without a main function, "evaluating" the parsed source needs to register the
             * functions into the SLContext.
             */
            evalMain = new SLEvalRootNode(this, null, null, null, "[no_main]", functions);
        }
        return Truffle.getRuntime().createCallTarget(evalMain);
    }

    @Override
    protected Object findExportedSymbol(SLContext context, String globalName, boolean onlyExplicit) {
        return context.getFunctionRegistry().lookup(globalName, false);
    }

    @Override
    protected Object getLanguageGlobal(SLContext context) {
        /*
         * The context itself is the global function registry. SL does not have global variables.
         */
        return context;
    }

    @Override
    protected boolean isVisible(SLContext context, Object value) {
        return value != SLNull.SINGLETON;
    }

    @Override
    protected boolean isObjectOfLanguage(Object object) {
        return object instanceof SLFunction;
    }

    @Override
    protected String toString(SLContext context, Object value) {
        if (value == SLNull.SINGLETON) {
            return "NULL";
        }
        if (value instanceof SLBigNumber) {
            return super.toString(context, ((SLBigNumber) value).getValue());
        }
        if (value instanceof Long) {
            return Long.toString((Long) value);
        }
        return super.toString(context, value);
    }

    @Override
    protected Object findMetaObject(SLContext context, Object value) {
        if (value instanceof Number || value instanceof SLBigNumber) {
            return "Number";
        }
        if (value instanceof Boolean) {
            return "Boolean";
        }
        if (value instanceof String) {
            return "String";
        }
        if (value == SLNull.SINGLETON) {
            return "Null";
        }
        if (value instanceof SLFunction) {
            return "Function";
        }
        return "Object";
    }

    @Override
    protected SourceSection findSourceLocation(SLContext context, Object value) {
        if (value instanceof SLFunction) {
            SLFunction f = (SLFunction) value;
            return f.getCallTarget().getRootNode().getSourceSection();
        }
        return null;
    }

    @Override
    public AbstractScope findScope(SLContext context, Node node, Frame frame) {
        return SLLexicalScope.createScope(node);
    }

}