jspparser.java

来自「RESIN 3.2 最新源码」· Java 代码 · 共 2,239 行 · 第 1/4 页

      case '&':
        if (! _isXml)
          addText((char) ch);
        else {
          addText((char) parseEntity());
	}
        ch = read();
        break;

      case '$':
        ch = read();

        if (ch == '{' && ! isELIgnored())
          ch = parseJspExpression();
        else
          addText('$');
        break;

      case '#':
        ch = read();

        if (isVelocity()) {
          ch = parseVelocity(ch);
        }
	else if (ch != '{' || isELIgnored()) {
          addText('#');
	}
        else if (isDeferredSyntaxAllowedAsLiteral()) {
          addText('#');
	}
        else
	  throw error(L.l("Deferred syntax ('#{...}') not allowed as literal."));
        break;

      case '\\':
        switch (ch = read()) {
        case '$':
          if (! isELIgnored()) {
            addText('$');
            ch = read();
          }
          else
            addText('\\');
          break;
	  
        case '#':
          if (! isELIgnored()) {
            addText('#');
            ch = read();
          }
          else
            addText('\\');
          break;

        case '\\':
          addText('\\');
          break;

        default:
          addText('\\');
          break;
        }
        break;

      default:
	addText((char) ch);
	ch = read();
        break;
      }
    }
    
    addText();

    /* XXX: end document
    if (! _activeNode.getNodeName().equals("jsp:root"))
      throw error(L.l("'</{0}>' expected at end of file.  For XML, the top-level tag must have a matching closing tag.",
                      activeNode.getNodeName()));
    */
  }

  /**
   * JSTL-style expressions.  Currently understood:
   *
   * <code><pre>
   * ${a * b} - any arbitrary expression
   * </pre></code>
   */
  private int parseJspExpression()
    throws IOException, JspParseException
  {
    addText();

    Path jspPath = _jspPath;
    String filename = _filename;
    int line = _line;

    CharBuffer cb = CharBuffer.allocate();
    int ch;
    cb.append("${");
    for (ch = read(); ch >= 0 && ch != '}'; ch = read())
      cb.append((char) ch);
    cb.append("}");

    ch = read();

    String prefix = _parseState.findPrefix(JSTL_CORE_URI);

    if (prefix == null) {
      prefix = "resin-c";

      /*
      _jspBuilder.startElement(JSP_DIRECTIVE_TAGLIB);
      _jspBuilder.attribute(new QName("prefix"), prefix);
      _jspBuilder.attribute(new QName("uri"), JSTL_CORE_URI);
      _jspBuilder.endAttributes();
      _jspBuilder.endElement(JSP_DIRECTIVE_TAGLIB.getName());
      */
      _jspBuilder.addNamespace(prefix, JSTL_CORE_URI);
      
      processTaglib(prefix, JSTL_CORE_URI);
    }
    
    setLocation(jspPath, filename, line);
    _jspBuilder.startElement(JSTL_CORE_OUT);
    _jspBuilder.attribute(new QName("value"), cb.close());
    _jspBuilder.attribute(new QName("escapeXml"), "false");
    _jspBuilder.endAttributes();
    _jspBuilder.endElement(JSTL_CORE_OUT.getName());

    return ch;
  }

  private int parseVelocity(int ch)
    throws IOException, JspParseException
  {
    if (ch == '{') {
      return parseVelocityScriptlet();
    }
    else if ('a' <= ch && ch <= 'z') {
      ch = readName(ch);
      String name = _tag.toString();

      if (name.equals("if")) {
        ch = parseVelocityIf("if");
      }
      else if (name.equals("elseif")) {
        addText();
        setLocation();

        JspNode node = _jspBuilder.getCurrentNode();
        if (! "resin-c:when".equals(node.getTagName()))
          throw error(L.l("#elseif is missing a corresponding #if.  Velocity-style #if syntax needs matching #if ... #elseif ... #else ... #end.  The #if statements must also nest properly with any tags."));
              
        _jspBuilder.endElement("resin-c:when");
        ch = parseVelocityIf("elseif");
      }
      else if (name.equals("else")) {
        addText();
        setLocation();
        _jspBuilder.endElement("resin-c:when");

        setLocation(_jspPath, _filename, _lineStart);
        _lineStart = _line;
        _jspBuilder.startElement(JSTL_CORE_OTHERWISE);
        _jspBuilder.endAttributes();

        ch = skipWhitespaceToEndOfLine(ch);
      }
      else if (name.equals("foreach")) {
        ch = parseVelocityForeach("resin-c:forEach");
      }
      else if (name.equals("end")) {
        addText();

        JspNode node = _jspBuilder.getCurrentNode();
        String nodeName = null;
        if (node != null)
          nodeName = node.getTagName();

        if (nodeName.equals("resin-c:when") ||
            nodeName.equals("resin-c:otherwise")) {
          _jspBuilder.endElement(nodeName);
          _jspBuilder.endElement(JSTL_CORE_CHOOSE.getName());
        }
        else if (nodeName.equals("resin-c:forEach"))
          _jspBuilder.endElement(nodeName);
        else {
          throw error(L.l("#end is missing a corresponding #if or #foreach.  Velocity-style #if syntax needs matching #if ... #elseif ... #else ... #end. The #if statements must also nest properly with any tags."));
        }

        ch = skipWhitespaceToEndOfLine(ch);
      }
      else {
        addText('#');
        addText(name);
      }
    }
    else
      addText('#');

    return ch;
  }

  /**
   * This syntax isn't part of velocity.
   *
   * <code><pre>
   * #{ int foo = 3; }#
   * </pre></code>
   */
  private int parseVelocityScriptlet()
    throws IOException, JspParseException
  {
    addText();

    setLocation(_jspPath, _filename, _line);
    _lineStart = _line;
    _jspBuilder.startElement(JSP_SCRIPTLET);
    _jspBuilder.endAttributes();

    int ch = read();
    while (ch >= 0) {
      if (ch == '}') {
        ch = read();
        if (ch == '#')
          break;
        else
          addText('}');
      }
      else {
        addText((char) ch);
        ch = read();
      }
    }

    createText();

    _jspBuilder.endElement(JSP_SCRIPTLET.getName());
    
    ch = read();

    if (ch == '\r') {
      ch = read();
      if (ch == '\n')
        return read();
      else
        return ch;
    }
    else if (ch == '\n')
      return read();
    else
      return ch;
  }

  /**
   * parses a #foreach statement
   *
   * <pre>
   * #foreach ([Type] var in expr)
   * ...
   * #end
   * </pre>
   *
   * <pre>
   * #foreach ([Type] var in [min .. max])
   * ...
   * #end
   * </pre>
   */
  private int parseVelocityForeach(String eltName)
    throws IOException, JspParseException
  {
    int ch;
    
    for (ch = read(); XmlChar.isWhitespace(ch); ch = read()) {
    }

    if (ch != '(')
      throw error(L.l("Expected `(' after #foreach at `{0}'.  The velocity-style #foreach syntax needs parentheses: #foreach ($a in expr)",
                      badChar(ch)));

    addText();

    processTaglib("resin-c", JSTL_CORE_URI);

    setLocation(_jspPath, _filename, _lineStart);
    _lineStart = _line;
    _jspBuilder.startElement(JSTL_CORE_FOREACH);

    CharBuffer cb = CharBuffer.allocate();
    parseVelocityName(cb);

    if (cb.length() == 0) {
      throw error(L.l("Expected iteration variable for #foreach at `{0}'.  The velocity-style #foreach syntax is: #foreach ($a in expr)",
                      badChar(ch)));
    }

    String name = cb.toString();
    
    cb.clear();
    parseVelocityName(cb);
    
    if (cb.length() == 0) {
      throw error(L.l("Expected 'in' for #foreach at `{0}'.  The velocity-style #foreach syntax is: #foreach ($a in expr)",
                      badChar(ch)));
    }

    String value = cb.toString();
    if (! value.equals("in")) {
      throw error(L.l("Expected 'in' for #foreach at `{0}'.  The velocity-style #foreach syntax is: #foreach ($a in expr)",
                      badChar(ch)));
    }

    if (name.startsWith("$"))
      name = name.substring(1);

    _jspBuilder.attribute(new QName("var"), name);

    cb.clear();
    parseVelocityExpr(cb, ')');
    String expr = cb.close();

    if (expr.indexOf("..") > 0) {
      int h = 0;
      for (; Character.isWhitespace(expr.charAt(h)); h++) {
      }

      if (expr.charAt(h) != '[')
        throw error(L.l("Expected '[' for #foreach `{0}'.  The velocity-style #foreach syntax is: #foreach ([Type] $a in [min .. max])",
                        badChar(expr.charAt(h))));
      
      int t = expr.length() - 1;
      for (; Character.isWhitespace(expr.charAt(t)); t--) {
      }

      if (expr.charAt(t) != ']')
        throw error(L.l("Expected ']' for #foreach `{0}'.  The velocity-style #foreach syntax is: #foreach ($a in [min .. max])",
                        badChar(expr.charAt(t))));
      
      int p = expr.indexOf("..");
      
      String min = expr.substring(h + 1, p);
      String max = expr.substring(p + 2, t);
      
      _jspBuilder.attribute(new QName("begin"), "${" + min + "}");
      _jspBuilder.attribute(new QName("end"), "${" + max + "}");
    }
    else {
      _jspBuilder.attribute(new QName("items"), "${" + expr + "}");
    }
    _jspBuilder.endAttributes();

    return skipWhitespaceToEndOfLine(read());
  }

  /**
   * parses an #if statement
   */
  private int parseVelocityIf(String eltName)
    throws IOException, JspParseException
  {
    int ch;
    
    for (ch = read(); XmlChar.isWhitespace(ch); ch = read()) {
    }

    if (ch != '(')
      throw error(L.l("Expected `(' after #if at `{0}'.  The velocity-style #if syntax needs parentheses: #if (...)",
                      badChar(ch)));

    addText();

    processTaglib("resin-c", JSTL_CORE_URI);
    
    setLocation(_jspPath, _filename, _line);
    if (eltName.equals("if")) {
      _jspBuilder.startElement(JSTL_CORE_CHOOSE);
      _jspBuilder.endAttributes();
    }
    _jspBuilder.startElement(JSTL_CORE_WHEN);
    _lineStart = _line;

    CharBuffer cb = CharBuffer.allocate();
    parseVelocityExpr(cb, ')');
    _jspBuilder.attribute(new QName("test"), "${" + cb.close() + "}");
    _jspBuilder.endAttributes();

    return skipWhitespaceToEndOfLine(read());
  }

  private int parseVelocityName(CharBuffer cb)
    throws IOException, JspParseException
  {
    int ch;
    
    for (ch = read(); XmlChar.isWhitespace(ch); ch = read()) {
    }

    for (; Character.isJavaIdentifierPart((char) ch); ch = read())
      cb.append((char) ch);

    return ch;
  }

  private int parseVelocityMin(CharBuffer cb)
    throws IOException, JspParseException
  {
    int ch;
    
    for (ch = read(); ch >= 0; ch = read()) {
      if (ch != '$')
        cb.append((char) ch);

      if (ch == '(') {
        ch = parseVelocityExpr(cb, ')');
        cb.append((char) ch);
      }
      else if (ch == '[') {
        ch = parseVelocityExpr(cb, ']');
        cb.append((char) ch);
      }
      else if (ch == '.') {
        ch = read();
        if (ch == '.')
          return ch;
        else {
          cb.append('.');
          _peek = ch;
        }
      }
    }

    return ch;
  }

  private int parseVelocityExpr(CharBuffer cb, int end)
    throws IOException, JspParseException
  {
    int ch;

    for (ch = read(); ch >= 0 && ch != end; ch = read()) {
      if (ch != '$')
        cb.append((char) ch);

      if (ch == '(') {
        ch = parseVelocityExpr(cb, ')');
        cb.append((char) ch);
      }
      else if (ch == '[') {
        ch = parseVelocityExpr(cb, ']');
        cb.append((char) ch);
      }
    }
    
    return ch;
  }

  /**
   * Parses a &lt;![CDATA[ block.  All text in the CDATA is uninterpreted.
   */
  private void parseCdata()
    throws IOException, JspParseException
  {
    int ch;

    ch = readName(read());

    String name = _tag.toString();

    if (! name.equals("CDATA"))
      throw error(L.l("Expected <![CDATA[ at <!['{0}'.", name,
                      "XML only recognizes the <![CDATA directive."));

    if (ch != '[')
      throw error(L.l("Expected '[' at '{0}'.  The XML CDATA syntax is <![CDATA[...]]>.",
                      String.valueOf(ch)));

    String filename = _filename;
    int line = _line;
                  
    while ((ch = read()) >= 0) {
      while (ch == ']') {
        if ((ch = read()) != ']')
          addText(']');
        else if ((ch = read()) != '>')
          addText("]]");
        else
          return;
      }

      addText((char) ch);
    }

    throw error(L.l("Expected closing ]]> at end of file to match <![[CDATA at {0}.", filename + ":" + line));
  }

  /**
   * Parses an XML name for elements and attribute names.  The parsed name
   * is stored in the 'tag' class variable.
   *
   * @param ch the next character
   *
   * @return the character following the name
   */
  private int readName(int ch)
    throws IOException, JspParseException
  {
    _tag.clear();

    for (; XmlChar.isNameChar((char) ch); ch = read())
      _tag.append((char) ch);

    return ch;
  }

  private void parsePageDirective(String name, String value)
    throws IOException, JspParseException
  {
    if ("isELIgnored".equals(name)) {
      if ("true".equals(value))
        _parseState.setELIgnored(true);
    }
  }

  /**
   * Parses a special JSP syntax.
   */
  private void parseScriptlet()
    throws IOException, JspParseException
  {
    addText();

    _lineStart = _line;

    int ch = read();

    // probably should be a qname
    QName eltName = null;

    switch (ch) {
    case '=':
      eltName = JSP_EXPRESSION;
      ch = read();
      break;

    case '!':
      eltName = JSP_DECLARATION;
      ch = read();
      break;

    case '@':
      parseDirective();
      return;

    case '-':
      if ((ch = read()) == '-') {
	parseComment();
	return;
      }