Example usage for com.google.gwt.core.ext.linker CompilationResult getStatementRanges

Introduction

In this page you can find the example usage for com.google.gwt.core.ext.linker CompilationResult getStatementRanges.

Prototype

public StatementRanges[] getStatementRanges() 

Source Link

Document

Returns the statement ranges for the JavaScript returned by #getJavaScript() .

Usage

From source file:gwt.ns.webworker.linker.WorkerCompilationLinker.java

License:Apache License

/**
 * Searches for all instances of a placeholder String in a
 * CompilationResult. If found, they are replaced as specified and a
 * new CompilationResult, with a newly generated strong name, is returned.
 * If no occurrences were found, the original CompilationResult is
 * returned.//from   w ww .java 2s .com
 * 
 * @param logger
 * @param result CompilationResult to process
 * @param placeholder String to be replaced
 * @param replacement String to insert in place of placeholder
 * 
 * @return A CompilationResult suitable for emitting
 */
public CompilationResult replacePlaceholder(TreeLogger logger, CompilationResult result, String placeholder,
        String replacement) {

    boolean needsMod = false;

    String[] js = result.getJavaScript();
    StringBuffer[] jsbuf = new StringBuffer[js.length];
    for (int i = 0; i < jsbuf.length; i++) {
        jsbuf[i] = new StringBuffer(js[i]);
    }

    // search and replace in all fragments
    for (StringBuffer fragment : jsbuf) {
        needsMod |= replaceAll(fragment, placeholder, replacement);
    }

    // by default, returning unaltered result
    CompilationResult toReturn = result;

    // code has been altered, need to create new CompilationResult
    if (needsMod) {
        logger.log(TreeLogger.SPAM,
                "Compilation permutation " + result.getPermutationId() + " being modified.");

        // new js for compilation result
        byte[][] newcode = new byte[jsbuf.length][];
        for (int i = 0; i < jsbuf.length; i++) {
            newcode[i] = Util.getBytes(jsbuf[i].toString());
        }

        // new strong name
        String strongName = Util.computeStrongName(newcode);

        // same symbolMap copied over since none altered
        // symbolMap a little more complicated
        // can only get deserialized version, need to reserialize
        // code from com.google.gwt.dev.jjs.JavaToJavaScriptCompiler
        // TODO: turns out this can get pretty bad. Workaround?
        SymbolData[] symbolMap = result.getSymbolMap();
        byte[] serializedSymbolMap;
        try {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            Util.writeObjectToStream(baos, (Object) symbolMap);
            serializedSymbolMap = baos.toByteArray();
        } catch (IOException e) {
            // should still never happen
            logger.log(TreeLogger.ERROR, "IOException while reserializing " + "SymbolMap.");
            throw new RuntimeException("Should never happen with in-memory stream", e);
        }

        StandardCompilationResult altered = new StandardCompilationResult(strongName, newcode,
                serializedSymbolMap, result.getStatementRanges(), result.getPermutationId());

        // need to copy permutation properties to new result
        for (Map<SelectionProperty, String> propertyMap : result.getPropertyMap()) {
            altered.addSelectionPermutation(propertyMap);
        }

        toReturn = altered;

        logger.log(TreeLogger.SPAM, "Compilation permuation " + toReturn.getPermutationId()
                + " altered to include path to worker script(s).");
    }

    return toReturn;
}

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