sacparser.java

cssparser -- CSS 的语法解析器。采用java语言编写。可用在服务端生成页面。

/* Generated By:JavaCC: Do not edit this line. SACParser.java */
package com.steadystate.css.parser;

import java.io.*;
import java.net.*;
import java.util.*;
import org.w3c.css.sac.*;
import com.steadystate.css.parser.selectors.*;

/**
 * @author David Schweinsberg
 * @version $Release$
 */
public class SACParser implements Parser, SACParserConstants {

    private InputSource _source = null;
    private Locale _locale = null;
    private DocumentHandler _docHandler = null;
    private ErrorHandler _errHandler = null;
    private SelectorFactory _selectorFactory = new SelectorFactoryImpl();
    private ConditionFactory _conditionFactory = new ConditionFactoryImpl();
    private boolean _quiet = true;

    public SACParser() {
        this((CharStream) null);
    }

    public void setLocale(Locale locale) throws CSSException {
        _locale = locale;

        // TODO: Search for requested locale

        throw new CSSException(CSSException.SAC_NOT_SUPPORTED_ERR);
    }

    public void setDocumentHandler(DocumentHandler handler) {
        _docHandler = handler;
    }

    public void setSelectorFactory(SelectorFactory selectorFactory) {
        _selectorFactory = selectorFactory;
    }

    public void setConditionFactory(ConditionFactory conditionFactory) {
        _conditionFactory = conditionFactory;
    }

    public void setErrorHandler(ErrorHandler handler) {
        _errHandler = handler;
    }

    public void parseStyleSheet(InputSource source)
            throws CSSException, IOException {
        _source = source;
        ReInit(getCharStream(source));
        try {
            styleSheet();
        } catch (ParseException e) {
            throw new CSSException(CSSException.SAC_SYNTAX_ERR, e.getMessage(), e);
        }
    }

    public void parseStyleSheet(String uri) throws CSSException, IOException {
        parseStyleSheet(new InputSource(uri));
    }

    public void parseStyleDeclaration(InputSource source)
            throws CSSException, IOException {
        _source = source;
        ReInit(getCharStream(source));
        try {
            styleDeclaration();
        } catch (ParseException e) {
            throw new CSSException(CSSException.SAC_SYNTAX_ERR, e.getMessage(), e);
        }
    }

    public void parseRule(InputSource source) throws CSSException, IOException {
        _source = source;
        ReInit(getCharStream(source));
        try {
            styleSheetRuleSingle();
        } catch (ParseException e) {
            throw new CSSException(CSSException.SAC_SYNTAX_ERR, e.getMessage(), e);
        }
    }

    public String getParserVersion() {
        return "http://www.w3.org/TR/REC-CSS2";
    }

    public SelectorList parseSelectors(InputSource source)
            throws CSSException, IOException {
        _source = source;
        ReInit(getCharStream(source));
        SelectorList sl = null;
        try {
            sl = selectorList();
        } catch (ParseException e) {
            throw new CSSException(CSSException.SAC_SYNTAX_ERR, e.getMessage(), e);
        }
        return sl;
    }

    public LexicalUnit parsePropertyValue(InputSource source)
            throws CSSException, IOException {
        _source = source;
        ReInit(getCharStream(source));
        LexicalUnit lu = null;
        try {
            lu = expr();
        } catch (ParseException e) {
            throw new CSSException(CSSException.SAC_SYNTAX_ERR, e.getMessage(), e);
        }
        return lu;
    }

    public boolean parsePriority(InputSource source)
            throws CSSException, IOException {
        _source = source;
        ReInit(getCharStream(source));
        boolean b = false;
        try {
            b = prio();
        } catch (ParseException e) {
            throw new CSSException(CSSException.SAC_SYNTAX_ERR, e.getMessage(), e);
        }
        return b;
    }

    private CharStream getCharStream(InputSource source)
            throws CSSException, IOException {
        if (source.getCharacterStream() != null) {
                return new ASCII_CharStream(source.getCharacterStream(), 1, 1);
            } else {

            // TODO: Handle other sources
            return null;
        }
    }

    private Locator getLocator() {
        return null;
    }

//
// stylesheet
//  : [ CHARSET_SYM S* STRING S* ';' ]?
//      [S|CDO|CDC]* [ import [S|CDO|CDC]* ]*
//      [ [ ruleset | media | page | font_face ] [S|CDO|CDC]* ]*
//  ;
//
  final public void styleSheet() throws ParseException {
    try {
          _docHandler.startDocument(_source);
      styleSheetRuleList();
      jj_consume_token(0);
    } finally {
        _docHandler.endDocument(_source);
    }
  }

  final public void styleSheetRuleList() throws ParseException {
    switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
    case CHARSET_SYM:
      charsetRule();
      break;
    default:
      jj_la1[0] = jj_gen;
      ;
    }
    label_1:
    while (true) {
      switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
      case S:
      case CDO:
      case CDC:
        ;
        break;
      default:
        jj_la1[1] = jj_gen;
        break label_1;
      }
      switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
      case S:
        jj_consume_token(S);
        break;
      case CDO:
        jj_consume_token(CDO);
        break;
      case CDC:
        jj_consume_token(CDC);
        break;
      default:
        jj_la1[2] = jj_gen;
        jj_consume_token(-1);
        throw new ParseException();
      }
    }
    label_2:
    while (true) {
      switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
      case IMPORT_SYM:
        ;
        break;
      default:
        jj_la1[3] = jj_gen;
        break label_2;
      }
      importRule();
      label_3:
      while (true) {
        switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
        case S:
        case CDO:
        case CDC:
          ;
          break;
        default:
          jj_la1[4] = jj_gen;
          break label_3;
        }
        switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
        case S:
          jj_consume_token(S);
          break;
        case CDO:
          jj_consume_token(CDO);
          break;
        case CDC:
          jj_consume_token(CDC);
          break;
        default:
          jj_la1[5] = jj_gen;
          jj_consume_token(-1);
          throw new ParseException();
        }
      }
    }
    label_4:
    while (true) {
      switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
      case DOT:
      case COLON:
      case ASTERISK:
      case LSQUARE:
      case HASH:
      case PAGE_SYM:
      case MEDIA_SYM:
      case FONT_FACE_SYM:
      case ATKEYWORD:
      case IDENT:
        ;
        break;
      default:
        jj_la1[6] = jj_gen;
        break label_4;
      }
      switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
      case DOT:
      case COLON:
      case ASTERISK:
      case LSQUARE:
      case HASH:
      case IDENT:
        styleRule();
        break;
      case MEDIA_SYM:
        mediaRule();
        break;
      case PAGE_SYM:
        pageRule();
        break;
      case FONT_FACE_SYM:
        fontFaceRule();
        break;
      case ATKEYWORD:
        unknownRule();
        break;
      default:
        jj_la1[7] = jj_gen;
        jj_consume_token(-1);
        throw new ParseException();
      }
      label_5:
      while (true) {
        switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
        case S:
        case CDO:
        case CDC:
          ;
          break;
        default:
          jj_la1[8] = jj_gen;
          break label_5;
        }
        switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
        case S:
          jj_consume_token(S);
          break;
        case CDO:
          jj_consume_token(CDO);
          break;
        case CDC:
          jj_consume_token(CDC);
          break;
        default:
          jj_la1[9] = jj_gen;
          jj_consume_token(-1);
          throw new ParseException();
        }
      }
    }
  }

//
// This is used by ASTStyleSheet.insertRule to parse a single rule
//
  final public void styleSheetRuleSingle() throws ParseException {
    switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
    case CHARSET_SYM:
      charsetRule();
      break;
    case IMPORT_SYM:
      importRule();
      break;
    case DOT:
    case COLON:
    case ASTERISK:
    case LSQUARE:
    case HASH:
    case IDENT:
      styleRule();
      break;
    case MEDIA_SYM:
      mediaRule();
      break;
    case PAGE_SYM:
      pageRule();
      break;
    case FONT_FACE_SYM:
      fontFaceRule();
      break;
    case ATKEYWORD:
      unknownRule();
      break;
    default:
      jj_la1[10] = jj_gen;
      jj_consume_token(-1);
      throw new ParseException();
    }
  }

  final public void charsetRule() throws ParseException {
  Token t;
    jj_consume_token(CHARSET_SYM);
    label_6:
    while (true) {
      switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
      case S:
        ;
        break;
      default:
        jj_la1[11] = jj_gen;
        break label_6;
      }
      jj_consume_token(S);
    }
    t = jj_consume_token(STRING);
    label_7:
    while (true) {
      switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
      case S:
        ;
        break;
      default:
        jj_la1[12] = jj_gen;
        break label_7;
      }
      jj_consume_token(S);
    }
    jj_consume_token(SEMICOLON);
  }

  final public void unknownRule() throws ParseException {
    Token t;
    String s;
    t = jj_consume_token(ATKEYWORD);
        s = skip();
        _docHandler.ignorableAtRule(s);
  }

//
// import
//   : IMPORT_SYM S*
//     [STRING|URI] S* [ medium [ ',' S* medium]* ]? ';' S*
//   ;
//
  final public void importRule() throws ParseException {
    Token t;
    String s;
    SACMediaListImpl ml = new SACMediaListImpl();
    jj_consume_token(IMPORT_SYM);
    label_8:
    while (true) {
      switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
      case S:
        ;
        break;
      default:
        jj_la1[13] = jj_gen;
        break label_8;
      }
      jj_consume_token(S);
    }
    switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
    case STRING:
      t = jj_consume_token(STRING);
      break;
    case URI:
      t = jj_consume_token(URI);
      break;
    default:
      jj_la1[14] = jj_gen;
      jj_consume_token(-1);
      throw new ParseException();
    }
    label_9:
    while (true) {
      switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
      case S:
        ;
        break;
      default:
        jj_la1[15] = jj_gen;
        break label_9;
      }
      jj_consume_token(S);
    }
    switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
    case IDENT:
      mediaList(ml);
      break;
    default:
      jj_la1[16] = jj_gen;
      ;
    }
    jj_consume_token(SEMICOLON);
        _docHandler.importStyle(unescape(t.image), ml, null);
  }

//
// media
//   : MEDIA_SYM S* medium [ ',' S* medium ]* '{' S* ruleset* '}' S*
//   ;
//
  final public void mediaRule() throws ParseException {
    boolean start = false;
    SACMediaListImpl ml = new SACMediaListImpl();
    try {
      jj_consume_token(MEDIA_SYM);
      label_10:
      while (true) {
        switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
        case S:
          ;
          break;
        default:
          jj_la1[17] = jj_gen;
          break label_10;
        }
        jj_consume_token(S);
      }
      mediaList(ml);
            start = true;
            _docHandler.startMedia(ml);
      jj_consume_token(LBRACE);
      label_11:
      while (true) {
        switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
        case S:
          ;
          break;
        default:
          jj_la1[18] = jj_gen;
          break label_11;
        }
        jj_consume_token(S);
      }
      switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
      case DOT:
      case COLON:
      case ASTERISK:
      case LSQUARE:
      case HASH:
      case PAGE_SYM:
      case ATKEYWORD:
      case IDENT:
        mediaRuleList();
        break;
      default:
        jj_la1[19] = jj_gen;
        ;
      }
      jj_consume_token(RBRACE);
    } finally {