java基础之format的使用

  private static class FormatRule {
        private Pattern mPattern;
        private String mReplaceWith;

        /**
         * Create a wiki formatting rule.
         *
         * @param pattern Search string to be compiled into a {@link Pattern}.
         * @param replaceWith String to replace any found occurances with. This
         *            string can also include back-references into the given
         *            pattern.
         * @param flags Any flags to compile the {@link Pattern} with.
         */
        public FormatRule(String pattern, String replaceWith, int flags) {
            mPattern = Pattern.compile(pattern, flags);
            mReplaceWith = replaceWith;
        }

        /**
         * Create a wiki formatting rule.
         *
         * @param pattern Search string to be compiled into a {@link Pattern}.
         * @param replaceWith String to replace any found occurances with. This
         *            string can also include back-references into the given
         *            pattern.
         */
        public FormatRule(String pattern, String replaceWith) {
            this(pattern, replaceWith, 0);
        }

        /**
         * Apply this formatting rule to the given input string, and return the
         * resulting new string.
         */
        public String apply(String input) {
            Matcher m = mPattern.matcher(input);
            return m.replaceAll(mReplaceWith);
        }

    }

    /**
     * List of internal formatting rules to apply when parsing wiki text. These
     * include indenting various bullets, apply italic and bold styles, and
     * adding internal linking.
     */
    private static final List<FormatRule> sFormatRules = new ArrayList<FormatRule>();

    static {
        // Format header blocks and wrap outside content in ordered list
        sFormatRules.add(new FormatRule("^=+(.+?)=+", "</ol><h2>$1</h2><ol>",
                Pattern.MULTILINE));

        // Indent quoted blocks, handle ordered and bullet lists
        sFormatRules.add(new FormatRule("^#+\\*?:(.+?)$", "<blockquote>$1</blockquote>",
                Pattern.MULTILINE));
        sFormatRules.add(new FormatRule("^#+:?\\*(.+?)$", "<ul><li>$1</li></ul>",
                Pattern.MULTILINE));
        sFormatRules.add(new FormatRule("^#+(.+?)$", "<li>$1</li>",
                Pattern.MULTILINE));

        // Add internal links
        sFormatRules.add(new FormatRule("\\[\\[([^:\\|\\]]+)\\]\\]",
                String.format("<a href=\"%s://%s/$1\">$1</a>", WIKI_AUTHORITY, WIKI_LOOKUP_HOST)));
        sFormatRules.add(new FormatRule("\\[\\[([^:\\|\\]]+)\\|([^\\]]+)\\]\\]",
                String.format("<a href=\"%s://%s/$1\">$2</a>", WIKI_AUTHORITY, WIKI_LOOKUP_HOST)));

        // Add bold and italic formatting
        sFormatRules.add(new FormatRule("'''(.+?)'''", "<b>$1</b>"));
        sFormatRules.add(new FormatRule("([^'])''([^'].*?[^'])''([^'])", "$1<i>$2</i>$3"));

        // Remove odd category links and convert remaining links into flat text
        sFormatRules.add(new FormatRule("(\\{+.+?\\}+|\\[\\[[^:]+:[^\\\\|\\]]+\\]\\]|" +
                "\\[http.+?\\]|\\[\\[Category:.+?\\]\\])", "", Pattern.MULTILINE | Pattern.DOTALL));
        sFormatRules.add(new FormatRule("\\[\\[([^\\|\\]]+\\|)?(.+?)\\]\\]", "$2",
                Pattern.MULTILINE));

    }