}
    return result;
  }

  /**
   * Convert this builder into a char escaper which is just a decorator around the underlying array
   * of replacement char[]s.
   *
   * @return an escaper that escapes based on the underlying array.
   */
  public Escaper toEscaper() {
    return new CharArrayDecorator(toArray());
  }

   *
   * @param replacements a map of characters to their escaped representations
   */
  public static ArrayBasedEscaperMap create(Map<Character, String> replacements) {
    return new ArrayBasedEscaperMap(createReplacementArray(replacements));
  }

  // The underlying replacement array we can share between multiple escaper
  // instances.
  private final char[][] replacementArray;

 *
 */
public class JsonUtil {

    /**
     * Defualt constructor.
     */
    protected JsonUtil() {
    }

    /**
     * Escapes a value as Json string.
     *
     * @param value input
     * @return escaped string.
     */
    public static String escape(final String value) {
        if (value == null) {
            return null;
        }

        char c;
        final int len = value.length();

 */

package com.google.common.escape;

import junit.framework.TestCase;

public class CharEscaperBuilderTest extends TestCase {

  public void testAddEscapes() {
    char[] cs = {'a', 'b', 'c'};
    CharEscaperBuilder builder = new CharEscaperBuilder().addEscapes(cs, "Z");
    Escaper escaper = builder.toEscaper();
    assertEquals("ZZZdef", escaper.escape("abcdef"));
  }

    assertUnicodeEscaping(e, "%F4%8F%BF%BF", '\uDBFF', '\uDFFF');

    // simple string tests
    assertEquals("", e.escape(""));
    assertEquals("safestring", e.escape("safestring"));
    assertEquals("embedded%00null", e.escape("embedded\0null"));
    assertEquals("max%EF%BF%BFchar", e.escape("max\uffffchar"));
  }

  /** Tests the various ways that the space character can be handled */
  public void testPlusForSpace() {

    UnicodeEscaper e = (UnicodeEscaper) urlFormParameterEscaper();
    // Verify that these are the same escaper (as documented)
    assertSame(e, urlFormParameterEscaper());
    assertBasicUrlEscaper(e);

    /*
     * Specified as safe by RFC 2396 but not by java.net.URLEncoder. These tests will start failing
     * when the escaper is made compliant with RFC 2396, but that's a good thing (just change them
     * to assertUnescaped).
     */

 */

package com.google.common.escape;

import junit.framework.TestCase;

public class CharEscaperBuilderTest extends TestCase {

  public void testAddEscapes() {
    char[] cs = {'a', 'b', 'c'};
    CharEscaperBuilder builder = new CharEscaperBuilder().addEscapes(cs, "Z");
    Escaper escaper = builder.toEscaper();
    assertEquals("ZZZdef", escaper.escape("abcdef"));
  }

    UnicodeEscaper e = (UnicodeEscaper) urlFormParameterEscaper();
    // Verify that these are the same escaper (as documented)
    assertSame(e, urlFormParameterEscaper());
    assertBasicUrlEscaper(e);

    /*
     * Specified as safe by RFC 2396 but not by java.net.URLEncoder. These tests will start failing
     * when the escaper is made compliant with RFC 2396, but that's a good thing (just change them
     * to assertUnescaped).
     */

     * is that in JavaScript, a single quote must be escaped.</p>
     *
     * <p>Example:</p>
     * <pre>
     * input string: He didn't say, "Stop!"
     * output string: He didn't say, \"Stop!\"
     * </pre>
     *
     *
     * @param str  String to escape values in, may be null
     * @return String with escaped values, <code>null</code> if null string input
     */

// MarshalText returns a canonical text representation of
// the Context.

// MarshalText sorts the context keys and writes the sorted
// key-value pairs as canonical JSON object. The sort order
// is based on the un-escaped keys. It never returns an error.
func (c Context) MarshalText() ([]byte, error) {
	if len(c) == 0 {
		return []byte{'{', '}'}, nil
	}

	// Pre-allocate a buffer - 128 bytes is an arbitrary