parser.java

业界著名的tomcat服务器的最新6.0的源代码。

     */
    private void parsePageDirective(Node parent) throws JasperException {
        Attributes attrs = parseAttributes();
        Node.PageDirective n = new Node.PageDirective(attrs, start, parent);

        /*
         * A page directive may contain multiple 'import' attributes, each of
         * which consists of a comma-separated list of package names. Store each
         * list with the node, where it is parsed.
         */
        for (int i = 0; i < attrs.getLength(); i++) {
            if ("import".equals(attrs.getQName(i))) {
                n.addImport(attrs.getValue(i));
            }
        }
    }

    /*
     * Parses an include directive with the following syntax: IncludeDirective
     * ::= ( S Attribute)*
     */
    private void parseIncludeDirective(Node parent) throws JasperException {
        Attributes attrs = parseAttributes();

        // Included file expanded here
        Node includeNode = new Node.IncludeDirective(attrs, start, parent);
        processIncludeDirective(attrs.getValue("file"), includeNode);
    }

    /**
     * Add a list of files. This is used for implementing include-prelude and
     * include-coda of jsp-config element in web.xml
     */
    private void addInclude(Node parent, List files) throws JasperException {
        if (files != null) {
            Iterator iter = files.iterator();
            while (iter.hasNext()) {
                String file = (String) iter.next();
                AttributesImpl attrs = new AttributesImpl();
                attrs.addAttribute("", "file", "file", "CDATA", file);

                // Create a dummy Include directive node
                Node includeNode = new Node.IncludeDirective(attrs, reader
                        .mark(), parent);
                processIncludeDirective(file, includeNode);
            }
        }
    }

    /*
     * Parses a taglib directive with the following syntax: Directive ::= ( S
     * Attribute)*
     */
    private void parseTaglibDirective(Node parent) throws JasperException {

        Attributes attrs = parseAttributes();
        String uri = attrs.getValue("uri");
        String prefix = attrs.getValue("prefix");
        if (prefix != null) {
            Mark prevMark = pageInfo.getNonCustomTagPrefix(prefix);
            if (prevMark != null) {
                err.jspError(reader.mark(), "jsp.error.prefix.use_before_dcl",
                        prefix, prevMark.getFile(), ""
                                + prevMark.getLineNumber());
            }
            if (uri != null) {
                String uriPrev = pageInfo.getURI(prefix);
                if (uriPrev != null && !uriPrev.equals(uri)) {
                    err.jspError(reader.mark(), "jsp.error.prefix.refined",
                            prefix, uri, uriPrev);
                }
                if (pageInfo.getTaglib(uri) == null) {
                    TagLibraryInfoImpl impl = null;
                    if (ctxt.getOptions().isCaching()) {
                        impl = (TagLibraryInfoImpl) ctxt.getOptions()
                                .getCache().get(uri);
                    }
                    if (impl == null) {
                        String[] location = ctxt.getTldLocation(uri);
                        impl = new TagLibraryInfoImpl(ctxt, parserController, pageInfo,
                                prefix, uri, location, err);
                        if (ctxt.getOptions().isCaching()) {
                            ctxt.getOptions().getCache().put(uri, impl);
                        }
                    }
                    pageInfo.addTaglib(uri, impl);
                }
                pageInfo.addPrefixMapping(prefix, uri);
            } else {
                String tagdir = attrs.getValue("tagdir");
                if (tagdir != null) {
                    String urnTagdir = URN_JSPTAGDIR + tagdir;
                    if (pageInfo.getTaglib(urnTagdir) == null) {
                        pageInfo.addTaglib(urnTagdir,
                                new ImplicitTagLibraryInfo(ctxt,
                                        parserController, pageInfo, prefix, tagdir, err));
                    }
                    pageInfo.addPrefixMapping(prefix, urnTagdir);
                }
            }
        }

        new Node.TaglibDirective(attrs, start, parent);
    }

    /*
     * Parses a directive with the following syntax: Directive ::= S? ( 'page'
     * PageDirective | 'include' IncludeDirective | 'taglib' TagLibDirective) S?
     * '%>'
     * 
     * TagDirective ::= S? ('tag' PageDirective | 'include' IncludeDirective |
     * 'taglib' TagLibDirective) | 'attribute AttributeDirective | 'variable
     * VariableDirective S? '%>'
     */
    private void parseDirective(Node parent) throws JasperException {
        reader.skipSpaces();

        String directive = null;
        if (reader.matches("page")) {
            directive = "&lt;%@ page";
            if (isTagFile) {
                err.jspError(reader.mark(), "jsp.error.directive.istagfile",
                        directive);
            }
            parsePageDirective(parent);
        } else if (reader.matches("include")) {
            directive = "&lt;%@ include";
            parseIncludeDirective(parent);
        } else if (reader.matches("taglib")) {
            if (directivesOnly) {
                // No need to get the tagLibInfo objects. This alos suppresses
                // parsing of any tag files used in this tag file.
                return;
            }
            directive = "&lt;%@ taglib";
            parseTaglibDirective(parent);
        } else if (reader.matches("tag")) {
            directive = "&lt;%@ tag";
            if (!isTagFile) {
                err.jspError(reader.mark(), "jsp.error.directive.isnottagfile",
                        directive);
            }
            parseTagDirective(parent);
        } else if (reader.matches("attribute")) {
            directive = "&lt;%@ attribute";
            if (!isTagFile) {
                err.jspError(reader.mark(), "jsp.error.directive.isnottagfile",
                        directive);
            }
            parseAttributeDirective(parent);
        } else if (reader.matches("variable")) {
            directive = "&lt;%@ variable";
            if (!isTagFile) {
                err.jspError(reader.mark(), "jsp.error.directive.isnottagfile",
                        directive);
            }
            parseVariableDirective(parent);
        } else {
            err.jspError(reader.mark(), "jsp.error.invalid.directive");
        }

        reader.skipSpaces();
        if (!reader.matches("%>")) {
            err.jspError(start, "jsp.error.unterminated", directive);
        }
    }

    /*
     * Parses a directive with the following syntax:
     * 
     * XMLJSPDirectiveBody ::= S? ( ( 'page' PageDirectiveAttrList S? ( '/>' | (
     * '>' S? ETag ) ) | ( 'include' IncludeDirectiveAttrList S? ( '/>' | ( '>'
     * S? ETag ) ) | <TRANSLATION_ERROR>
     * 
     * XMLTagDefDirectiveBody ::= ( ( 'tag' TagDirectiveAttrList S? ( '/>' | (
     * '>' S? ETag ) ) | ( 'include' IncludeDirectiveAttrList S? ( '/>' | ( '>'
     * S? ETag ) ) | ( 'attribute' AttributeDirectiveAttrList S? ( '/>' | ( '>'
     * S? ETag ) ) | ( 'variable' VariableDirectiveAttrList S? ( '/>' | ( '>' S?
     * ETag ) ) ) | <TRANSLATION_ERROR>
     */
    private void parseXMLDirective(Node parent) throws JasperException {
        reader.skipSpaces();

        String eTag = null;
        if (reader.matches("page")) {
            eTag = "jsp:directive.page";
            if (isTagFile) {
                err.jspError(reader.mark(), "jsp.error.directive.istagfile",
                        "&lt;" + eTag);
            }
            parsePageDirective(parent);
        } else if (reader.matches("include")) {
            eTag = "jsp:directive.include";
            parseIncludeDirective(parent);
        } else if (reader.matches("tag")) {
            eTag = "jsp:directive.tag";
            if (!isTagFile) {
                err.jspError(reader.mark(), "jsp.error.directive.isnottagfile",
                        "&lt;" + eTag);
            }
            parseTagDirective(parent);
        } else if (reader.matches("attribute")) {
            eTag = "jsp:directive.attribute";
            if (!isTagFile) {
                err.jspError(reader.mark(), "jsp.error.directive.isnottagfile",
                        "&lt;" + eTag);
            }
            parseAttributeDirective(parent);
        } else if (reader.matches("variable")) {
            eTag = "jsp:directive.variable";
            if (!isTagFile) {
                err.jspError(reader.mark(), "jsp.error.directive.isnottagfile",
                        "&lt;" + eTag);
            }
            parseVariableDirective(parent);
        } else {
            err.jspError(reader.mark(), "jsp.error.invalid.directive");
        }

        reader.skipSpaces();
        if (reader.matches(">")) {
            reader.skipSpaces();
            if (!reader.matchesETag(eTag)) {
                err.jspError(start, "jsp.error.unterminated", "&lt;" + eTag);
            }
        } else if (!reader.matches("/>")) {
            err.jspError(start, "jsp.error.unterminated", "&lt;" + eTag);
        }
    }

    /*
     * Parses a tag directive with the following syntax: PageDirective ::= ( S
     * Attribute)*
     */
    private void parseTagDirective(Node parent) throws JasperException {
        Attributes attrs = parseAttributes();
        Node.TagDirective n = new Node.TagDirective(attrs, start, parent);

        /*
         * A page directive may contain multiple 'import' attributes, each of
         * which consists of a comma-separated list of package names. Store each
         * list with the node, where it is parsed.
         */
        for (int i = 0; i < attrs.getLength(); i++) {
            if ("import".equals(attrs.getQName(i))) {
                n.addImport(attrs.getValue(i));
            }
        }
    }

    /*
     * Parses a attribute directive with the following syntax:
     * AttributeDirective ::= ( S Attribute)*
     */
    private void parseAttributeDirective(Node parent) throws JasperException {
        Attributes attrs = parseAttributes();
        Node.AttributeDirective n = new Node.AttributeDirective(attrs, start,
                parent);
    }

    /*
     * Parses a variable directive with the following syntax: PageDirective ::= (
     * S Attribute)*
     */
    private void parseVariableDirective(Node parent) throws JasperException {
        Attributes attrs = parseAttributes();
        Node.VariableDirective n = new Node.VariableDirective(attrs, start,
                parent);
    }

    /*
     * JSPCommentBody ::= (Char* - (Char* '--%>')) '--%>'
     */
    private void parseComment(Node parent) throws JasperException {
        start = reader.mark();
        Mark stop = reader.skipUntil("--%>");
        if (stop == null) {
            err.jspError(start, "jsp.error.unterminated", "&lt;%--");
        }

        new Node.Comment(reader.getText(start, stop), start, parent);
    }

    /*
     * DeclarationBody ::= (Char* - (char* '%>')) '%>'
     */
    private void parseDeclaration(Node parent) throws JasperException {
        start = reader.mark();
        Mark stop = reader.skipUntil("%>");
        if (stop == null) {
            err.jspError(start, "jsp.error.unterminated", "&lt;%!");
        }

        new Node.Declaration(parseScriptText(reader.getText(start, stop)),
                start, parent);
    }

    /*
     * XMLDeclarationBody ::= ( S? '/>' ) | ( S? '>' (Char* - (char* '<'))
     * CDSect?)* ETag | <TRANSLATION_ERROR> CDSect ::= CDStart CData CDEnd
     * CDStart ::= '<![CDATA[' CData ::= (Char* - (Char* ']]>' Char*)) CDEnd
     * ::= ']]>'
     */
    private void parseXMLDeclaration(Node parent) throws JasperException {
        reader.skipSpaces();
        if (!reader.matches("/>")) {
            if (!reader.matches(">")) {
                err.jspError(start, "jsp.error.unterminated",
                        "&lt;jsp:declaration&gt;");
            }
            Mark stop;
            String text;
            while (true) {
                start = reader.mark();
                stop = reader.skipUntil("<");
                if (stop == null) {
                    err.jspError(start, "jsp.error.unterminated",
                            "&lt;jsp:declaration&gt;");
                }
                text = parseScriptText(reader.getText(start, stop));
                new Node.Declaration(text, start, parent);
                if (reader.matches("![CDATA[")) {
                    start = reader.mark();
                    stop = reader.skipUntil("]]>");
                    if (stop == null) {
                        err.jspError(start, "jsp.error.unterminated", "CDATA");
                    }
                    text = parseScriptText(reader.getText(start, stop));
                    new Node.Declaration(text, start, parent);
                } else {
                    break;
                }
            }

            if (!reader.matchesETagWithoutLessThan("jsp:declaration")) {
                err.jspError(start, "jsp.error.unterminated",
                        "&lt;jsp:declaration&gt;");
            }
        }
    }