How to use

Parser

in

org.apache.batik.css.parser

/**
 * Parses a style declaration using the current scanner.
 */
protected void parseStyleDeclarationInternal()
  throws CSSException, IOException {
  nextIgnoreSpaces();
  try {
    parseStyleDeclaration(false);
  } catch (CSSParseException e) {
    reportError(e);
  } finally {
    scanner.close();
    scanner = null;
  }
}

/**
 * Converts the current lexical unit to a float.
 */
protected float number(boolean positive) {
  try {
    float sgn = (positive) ? 1 : -1;
    String val = scanner.getStringValue();
    nextIgnoreSpaces();
    return sgn * Float.parseFloat(val);
  } catch (NumberFormatException e) {
    throw createCSSParseException("number.format");
  }
}

/**
 * <b>SAC</b>: Implements
 * {@link org.w3c.css.sac.Parser#parsePropertyValue(InputSource)}.
 */
public LexicalUnit parsePropertyValue(InputSource source)
  throws CSSException, IOException {
  scanner = createScanner(source);
  return parsePropertyValueInternal();
}

/**
 * Reports a parsing error.
 */
protected void reportError(String key, Object[] params) {
  reportError(createCSSParseException(key, params));
}

/**
 * <b>SAC</b>: Implements {@link
 * org.w3c.css.sac.Parser#parseRule(InputSource)}.
 */
public void parseRule(InputSource source)
  throws CSSException, IOException {
  scanner = createScanner(source);
  parseRuleInternal();
}

scanner = createScanner(source);
  switch (current) {
  case LexicalUnits.CHARSET_SYMBOL:
    if (nextIgnoreSpaces() != LexicalUnits.STRING) {
      reportError("charset.string");
    } else {
      if (nextIgnoreSpaces() != LexicalUnits.SEMI_COLON) {
        reportError("semicolon");
      next();
  skipSpacesAndCDOCDC();
  for (;;) {
    if (current == LexicalUnits.IMPORT_SYMBOL) {
      nextIgnoreSpaces();
      parseImportRule();
      nextIgnoreSpaces();
    } else {
      break;
    switch (current) {
    case LexicalUnits.PAGE_SYMBOL:
      nextIgnoreSpaces();
      parsePageRule();
      break;
    case LexicalUnits.MEDIA_SYMBOL:
      nextIgnoreSpaces();
      parseMediaRule();

  plus = false;
case LexicalUnits.PLUS:
  next();
  sgn = true;
default:
      nextIgnoreSpaces();
      return CSSLexicalUnit.createInteger( iVal, prev);
                     number(plus), prev);
  case LexicalUnits.PERCENTAGE:
    return CSSLexicalUnit.createFloat(LexicalUnit.SAC_PERCENTAGE,
                     number(plus), prev);
  case LexicalUnits.PT:
    return CSSLexicalUnit.createFloat(LexicalUnit.SAC_POINT,
                     number(plus), prev);
  case LexicalUnits.PC:
    return CSSLexicalUnit.createFloat(LexicalUnit.SAC_PICA,
                     number(plus), prev);
  case LexicalUnits.PX:
    return CSSLexicalUnit.createFloat(LexicalUnit.SAC_PIXEL,
                     number(plus), prev);
  case LexicalUnits.CM:
    return CSSLexicalUnit.createFloat(LexicalUnit.SAC_CENTIMETER,
                     number(plus), prev);
  case LexicalUnits.MM:
    return CSSLexicalUnit.createFloat(LexicalUnit.SAC_MILLIMETER,
                     number(plus), prev);
  case LexicalUnits.IN:

case LexicalUnits.EOF:
  if (inSheet) {
    throw createCSSParseException("eof");
    throw createCSSParseException("eof.expected");
  nextIgnoreSpaces();
  return;
case LexicalUnits.SEMI_COLON:
  nextIgnoreSpaces();
  continue;
default:
  throw createCSSParseException("identifier");
case LexicalUnits.IDENTIFIER:
if (nextIgnoreSpaces() != LexicalUnits.COLON) {
  throw createCSSParseException("colon");
nextIgnoreSpaces();
  exp = parseExpression(false);
} catch (CSSParseException e) {
  reportError(e);
  if (current == LexicalUnits.IMPORTANT_SYMBOL) {
    important = true;
    nextIgnoreSpaces();

  result = selectorFactory.createElementSelector
    (null, scanner.getStringValue());
  next();
  break;
case LexicalUnits.ANY:
  next();
default:
  result = selectorFactory.createElementSelector(null, null);
    c = conditionFactory.createIdCondition
      (scanner.getStringValue());
    next();
    break;
  case LexicalUnits.DOT:
    if (next() != LexicalUnits.IDENTIFIER) {
      throw createCSSParseException("identifier");
    next();
    break;
  case LexicalUnits.LEFT_BRACKET:
    if (nextIgnoreSpaces() != LexicalUnits.IDENTIFIER) {
      throw createCSSParseException("identifier");
    int op = nextIgnoreSpaces();
    switch (op) {
    default:
      throw createCSSParseException("right.bracket");
    case LexicalUnits.RIGHT_BRACKET:
      next();

/**
 * Parses a ruleset.
 */
protected void parseRuleSet() {
  SelectorList sl = null;
  try {
    sl = parseSelectorList();
  } catch (CSSParseException e) {
    reportError(e);
    return;
  }
  try {
    documentHandler.startSelector(sl);
    if (current != LexicalUnits.LEFT_CURLY_BRACE) {
      reportError("left.curly.brace");
      if (current == LexicalUnits.RIGHT_CURLY_BRACE) {
        nextIgnoreSpaces();
      }
    } else {
      nextIgnoreSpaces();
      try {
        parseStyleDeclaration(true);
      } catch (CSSParseException e) {
        reportError(e);
      }
    }
  } finally {
    documentHandler.endSelector(sl);
  }
}

/**
 * Parses an import rule. Assumes the current token is '@import'.
 */
protected void parseImportRule() {
  String uri = null;
  switch (current) {
  default:
    reportError("string.or.uri");
    return;
  case LexicalUnits.STRING:
  case LexicalUnits.URI:
    uri = scanner.getStringValue();
    nextIgnoreSpaces();
  }
  CSSSACMediaList ml;
  if (current != LexicalUnits.IDENTIFIER) {
    ml = new CSSSACMediaList();
    ml.append("all");
  } else {
    ml = parseMediaList();
  }
  documentHandler.importStyle(uri, ml, null);
  if (current != LexicalUnits.SEMI_COLON) {
    reportError("semicolon");
  } else {
    next();
  }
}

LexicalUnit result = parseTerm(null);
LexicalUnit curr = result;
    curr = CSSLexicalUnit.createSimple
      (LexicalUnit.SAC_OPERATOR_COMMA, curr);
    nextIgnoreSpaces();
    break;
  case LexicalUnits.DIVIDE:
    curr = CSSLexicalUnit.createSimple
      (LexicalUnit.SAC_OPERATOR_SLASH, curr);
    nextIgnoreSpaces();
        throw createCSSParseException
          ("token", new Object[] {current});
    curr = parseTerm(curr);
  } else {
    switch (current) {
    case LexicalUnits.EOF:
      if (op) {
        throw createCSSParseException
          ("token", new Object[] {current});
      curr = parseTerm(curr);

Selector result = parseSimpleSelector();
  case LexicalUnits.COLON:
    if (pseudoElement != null) {
      throw createCSSParseException("pseudo.element.position");
       parseSimpleSelector());
    break;
  case LexicalUnits.PLUS:
    if (pseudoElement != null) {
      throw createCSSParseException("pseudo.element.position");
    nextIgnoreSpaces();
    result = selectorFactory.createDirectAdjacentSelector
      ((short)1,
       result,
       parseSimpleSelector());
    break;
  case LexicalUnits.PRECEDE:
    if (pseudoElement != null) {
      throw createCSSParseException("pseudo.element.position");
    nextIgnoreSpaces();
    result = selectorFactory.createChildSelector
      (result,
       parseSimpleSelector());

/**
 * Parses the priority using the current scanner.
 */
protected boolean parsePriorityInternal()
  throws CSSException, IOException {
  nextIgnoreSpaces();
  scanner.close();
  scanner = null;
  switch (current) {
  case LexicalUnits.EOF:
    return false;
  case LexicalUnits.IMPORT_SYMBOL:
    return true;
  default:
    reportError("token", new Object[] {current});
    return false;
  }
}

/**
 * Parses selectors using the current scanner.
 */
protected SelectorList parseSelectorsInternal()
  throws CSSException, IOException {
  nextIgnoreSpaces();
  SelectorList ret = parseSelectorList();
  scanner.close();
  scanner = null;
  return ret;
}

/**
 * Parses a rule using the current scanner.
 */
protected void parseRuleInternal() throws CSSException, IOException {
  nextIgnoreSpaces();
  parseRule();
  scanner.close();
  scanner = null;
}

/**
 * <b>SAC</b>: Implements {@link
 * org.w3c.css.sac.Parser#parseStyleDeclaration(InputSource)}.
 */
public void parseStyleDeclaration(InputSource source)
  throws CSSException, IOException {
  scanner = createScanner(source);
  parseStyleDeclarationInternal();
}

/**
 * <b>SAC</b>: Implements {@link
 * org.w3c.css.sac.Parser#parseSelectors(InputSource)}.
 */
public SelectorList parseSelectors(InputSource source)
  throws CSSException, IOException {
  scanner = createScanner(source);
  return parseSelectorsInternal();
}

/**
 * <b>SAC</b>: Implements
 * {@link org.w3c.css.sac.Parser#parsePriority(InputSource)}.
 */
public boolean parsePriority(InputSource source)
  throws CSSException, IOException {
  scanner = createScanner(source);
  return parsePriorityInternal();
}

/**
 * Parses a selector list
 */
protected SelectorList parseSelectorList() {
  CSSSelectorList result = new CSSSelectorList();
  result.append(parseSelector());
  for (;;) {
    if (current != LexicalUnits.COMMA) {
      return result;
    }
    nextIgnoreSpaces();
    result.append(parseSelector());
  }
}