dim.java

javascript语言的解释器源码

            }
            boolean changed;
            synchronized (breakpoints) {
                if (breakpoints[line] != value) {
                    breakpoints[line] = value;
                    changed = true;
                } else {
                    changed = false;
                }
            }
            return changed;
        }

        void removeAllBreakpoints()
        {
            synchronized (breakpoints) {
                for (int line = 0; line != breakpoints.length; ++line) {
                    breakpoints[line] = false;
                }
            }
        }
    }

    private static final int IPROXY_DEBUG = 0;
    private static final int IPROXY_LISTEN = 1;
    private static final int IPROXY_COMPILE_SCRIPT = 2;
    private static final int IPROXY_EVAL_SCRIPT = 3;
    private static final int IPROXY_STRING_IS_COMPILABLE = 4;
    private static final int IPROXY_OBJECT_TO_STRING = 5;
    private static final int IPROXY_OBJECT_PROPERTY = 6;
    private static final int IPROXY_OBJECT_IDS = 7;

    /**
     * Proxy class to implement debug interfaces without bloat of class
     * files.
     */
    private static class DimIProxy
        implements ContextAction, ContextFactory.Listener, Debugger
    {
        private Dim dim;
        private int type;

        String url;
        String text;
        Object object;
        Object id;

        boolean booleanResult;
        String stringResult;
        Object objectResult;
        Object[] objectArrayResult;

        DimIProxy(Dim dim, int type)
        {
            this.dim = dim;
            this.type = type;
        }

        // ContextAction interface

        public Object run(Context cx)
        {
            switch (type) {
              case IPROXY_COMPILE_SCRIPT:
                cx.compileString(text, url, 1, null);
                break;

              case IPROXY_EVAL_SCRIPT:
                {
                    Scriptable scope = null;
                    if (dim.scopeProvider != null) {
                        scope = dim.scopeProvider.getScope();
                    }
                    if (scope == null) {
                        scope = new ImporterTopLevel(cx);
                    }
                    cx.evaluateString(scope, text, url, 1, null);
                }
                break;

              case IPROXY_STRING_IS_COMPILABLE:
                booleanResult = cx.stringIsCompilableUnit(text);
                break;

              case IPROXY_OBJECT_TO_STRING:
                if (object == Undefined.instance) {
                    stringResult = "undefined";
                } else if (object == null) {
                    stringResult = "null";
                } else if (object instanceof NativeCall) {
                    stringResult = "[object Call]";
                } else {
                    stringResult = Context.toString(object);
                }
                break;

              case IPROXY_OBJECT_PROPERTY:
                objectResult = dim.getObjectPropertyImpl(cx, object, id);
                break;

              case IPROXY_OBJECT_IDS:
                objectArrayResult = dim.getObjectIdsImpl(cx, object);
                break;

              default:
                throw Kit.codeBug();
            }
            return null;
        }

        void withContext()
        {
            dim.contextFactory.call(this);
        }

        // ContextFactory.Listener interface

        public void contextCreated(Context cx)
        {
            if (type != IPROXY_LISTEN) Kit.codeBug();
            ContextData contextData = new ContextData();
            Debugger debugger = new DimIProxy(dim, IPROXY_DEBUG);
            cx.setDebugger(debugger, contextData);
            cx.setGeneratingDebug(true);
            cx.setOptimizationLevel(-1);
        }

        public void contextReleased(Context cx)
        {
            if (type != IPROXY_LISTEN) Kit.codeBug();
        }

        // Debugger interface

        public DebugFrame getFrame(Context cx, DebuggableScript fnOrScript)
        {
            if (type != IPROXY_DEBUG) Kit.codeBug();

            FunctionSource item = dim.getFunctionSource(fnOrScript);
            if (item == null) {
                // Can not debug if source is not available
                return null;
            }
            return new StackFrame(cx, dim, item);
        }

        public void handleCompilationDone(Context cx,
                                          DebuggableScript fnOrScript,
                                          String source)
        {
            if (type != IPROXY_DEBUG) Kit.codeBug();

            if (!fnOrScript.isTopLevel()) {
                return;
            }
            dim.registerTopScript(fnOrScript, source);
        }
    }

    void attachTo(ContextFactory factory)
    {
        this.contextFactory = factory;
        factory.addListener(new DimIProxy(this, IPROXY_LISTEN));
    }

    FunctionSource getFunctionSource(DebuggableScript fnOrScript)
    {
        FunctionSource fsource = functionSource(fnOrScript);
        if (fsource == null) {
            String url = getNormilizedUrl(fnOrScript);
            SourceInfo si = sourceInfo(url);
            if (si == null) {
                if (!fnOrScript.isGeneratedScript()) {
                    // Not eval or Function, try to load it from URL
                    String source = loadSource(url);
                    if (source != null) {
                        DebuggableScript top = fnOrScript;
                        for (;;) {
                            DebuggableScript parent = top.getParent();
                            if (parent == null) {
                                break;
                            }
                            top = parent;
                        }
                        registerTopScript(top, source);
                        fsource = functionSource(fnOrScript);
                    }
                }
            }
        }
        return fsource;
    }

    private String loadSource(String sourceUrl)
    {
        String source = null;
        int hash = sourceUrl.indexOf('#');
        if (hash >= 0) {
            sourceUrl = sourceUrl.substring(0, hash);
        }
        try {
            InputStream is;
          openStream:
            {
                if (sourceUrl.indexOf(':') < 0) {
                    // Can be a file name
                    try {
                        if (sourceUrl.startsWith("~/")) {
                            String home = System.getProperty("user.home");
                            if (home != null) {
                                String pathFromHome = sourceUrl.substring(2);
                                File f = new File(new File(home), pathFromHome);
                                if (f.exists()) {
                                    is = new FileInputStream(f);
                                    break openStream;
                                }
                            }
                        }
                        File f = new File(sourceUrl);
                        if (f.exists()) {
                            is = new FileInputStream(f);
                            break openStream;
                        }
                    } catch (SecurityException ex) { }
                    // No existing file, assume missed http://
                    if (sourceUrl.startsWith("//")) {
                        sourceUrl = "http:" + sourceUrl;
                    } else if (sourceUrl.startsWith("/")) {
                        sourceUrl = "http://127.0.0.1" + sourceUrl;
                    } else {
                        sourceUrl = "http://" + sourceUrl;
                    }
                }

                is = (new URL(sourceUrl)).openStream();
            }

            try {
                source = Kit.readReader(new InputStreamReader(is));
            } finally {
                is.close();
            }
        } catch (IOException ex) {
            System.err.println
                ("Failed to load source from "+sourceUrl+": "+ ex);
        }
        return source;
    }

    void registerTopScript(DebuggableScript topScript, String source)
    {
        if (!topScript.isTopLevel()) {
            throw new IllegalArgumentException();
        }
        String url = getNormilizedUrl(topScript);
        DebuggableScript[] functions = getAllFunctions(topScript);
        final SourceInfo sourceInfo = new SourceInfo(source, functions, url);

        synchronized (urlToSourceInfo) {
            SourceInfo old = (SourceInfo)urlToSourceInfo.get(url);
            if (old != null) {
                sourceInfo.copyBreakpointsFrom(old);
            }
            urlToSourceInfo.put(url, sourceInfo);
            for (int i = 0; i != sourceInfo.functionSourcesTop(); ++i) {
                FunctionSource fsource = sourceInfo.functionSource(i);
                String name = fsource.name();
                if (name.length() != 0) {
                    functionNames.put(name, fsource);
                }
            }
        }

        synchronized (functionToSource) {
            for (int i = 0; i != functions.length; ++i) {
                FunctionSource fsource = sourceInfo.functionSource(i);
                functionToSource.put(functions[i], fsource);
            }
        }

        callback.updateSourceText(sourceInfo);
    }

    FunctionSource functionSource(DebuggableScript fnOrScript)
    {
        return (FunctionSource)functionToSource.get(fnOrScript);
    }

    String[] functionNames()
    {
        String[] a;
        synchronized (urlToSourceInfo) {
            Enumeration e = functionNames.keys();
            a = new String[functionNames.size()];
            int i = 0;
            while (e.hasMoreElements()) {
                a[i++] = (String)e.nextElement();
            }
        }
        return a;
    }

    FunctionSource functionSourceByName(String functionName)
    {
        return (FunctionSource)functionNames.get(functionName);
    }

    SourceInfo sourceInfo(String url)
    {
        return (SourceInfo)urlToSourceInfo.get(url);
    }

    String getNormilizedUrl(DebuggableScript fnOrScript)
    {
        String url = fnOrScript.getSourceName();
        if (url == null) { url = "<stdin>"; }
        else {
            // Not to produce window for eval from different lines,
            // strip line numbers, i.e. replace all #[0-9]+\(eval\) by
            // (eval)
            // Option: similar teatment for Function?
            char evalSeparator = '#';
            StringBuffer sb = null;
            int urlLength = url.length();
            int cursor = 0;
            for (;;) {
                int searchStart = url.indexOf(evalSeparator, cursor);
                if (searchStart < 0) {
                    break;
                }
                String replace = null;
                int i = searchStart + 1;
                boolean hasDigits = false;
                while (i != urlLength) {
                    int c = url.charAt(i);
                    if (!('0' <= c && c <= '9')) {
                        break;
                    }
                    ++i;
                }
                if (i != searchStart + 1) {
                    // i points after #[0-9]+
                    if ("(eval)".regionMatches(0, url, i, 6)) {
                        cursor = i + 6;
                        replace = "(eval)";
                    }
                }
                if (replace == null) {
                    break;
                }
                if (sb == null) {
                    sb = new StringBuffer();
                    sb.append(url.substring(0, searchStart));
                }
                sb.append(replace);
            }
            if (sb != null) {
                if (cursor != urlLength) {
                    sb.append(url.substring(cursor));
                }
                url = sb.toString();
            }
        }
        return url;
    }

    private static DebuggableScript[] getAllFunctions(DebuggableScript function)
    {
        ObjArray functions = new ObjArray();
        collectFunctions_r(function, functions);
        DebuggableScript[] result = new DebuggableScript[functions.size()];
        functions.toArray(result);
        return result;
    }

    private static void collectFunctions_r(DebuggableScript function,
                                           ObjArray array)
    {
        array.add(function);