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Filename : tiddlywiki.js
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// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: http://codemirror.net/LICENSE

/***
    |''Name''|tiddlywiki.js|
    |''Description''|Enables TiddlyWikiy syntax highlighting using CodeMirror|
    |''Author''|PMario|
    |''Version''|0.1.7|
    |''Status''|''stable''|
    |''Source''|[[GitHub|https://github.com/pmario/CodeMirror2/blob/tw-syntax/mode/tiddlywiki]]|
    |''Documentation''|http://codemirror.tiddlyspace.com/|
    |''License''|[[MIT License|http://www.opensource.org/licenses/mit-license.php]]|
    |''CoreVersion''|2.5.0|
    |''Requires''|codemirror.js|
    |''Keywords''|syntax highlighting color code mirror codemirror|
    ! Info
    CoreVersion parameter is needed for TiddlyWiki only!
***/

(function(mod) {
  if (typeof exports == "object" && typeof module == "object") // CommonJS
    mod(require("../../lib/codemirror"));
  else if (typeof define == "function" && define.amd) // AMD
    define(["../../lib/codemirror"], mod);
  else // Plain browser env
    mod(CodeMirror);
})(function(CodeMirror) {
"use strict";

CodeMirror.defineMode("tiddlywiki", function () {
  // Tokenizer
  var textwords = {};

  var keywords = {
    "allTags": true, "closeAll": true, "list": true,
    "newJournal": true, "newTiddler": true,
    "permaview": true, "saveChanges": true,
    "search": true, "slider": true, "tabs": true,
    "tag": true, "tagging": true, "tags": true,
    "tiddler": true, "timeline": true,
    "today": true, "version": true, "option": true,
    "with": true, "filter": true
  };

  var isSpaceName = /[\w_\-]/i,
      reHR = /^\-\-\-\-+$/,                                 // <hr>
      reWikiCommentStart = /^\/\*\*\*$/,            // /***
      reWikiCommentStop = /^\*\*\*\/$/,             // ***/
      reBlockQuote = /^<<<$/,

      reJsCodeStart = /^\/\/\{\{\{$/,                       // //{{{ js block start
      reJsCodeStop = /^\/\/\}\}\}$/,                        // //}}} js stop
      reXmlCodeStart = /^<!--\{\{\{-->$/,           // xml block start
      reXmlCodeStop = /^<!--\}\}\}-->$/,            // xml stop

      reCodeBlockStart = /^\{\{\{$/,                        // {{{ TW text div block start
      reCodeBlockStop = /^\}\}\}$/,                 // }}} TW text stop

      reUntilCodeStop = /.*?\}\}\}/;

  function chain(stream, state, f) {
    state.tokenize = f;
    return f(stream, state);
  }

  function tokenBase(stream, state) {
    var sol = stream.sol(), ch = stream.peek();

    state.block = false;        // indicates the start of a code block.

    // check start of  blocks
    if (sol && /[<\/\*{}\-]/.test(ch)) {
      if (stream.match(reCodeBlockStart)) {
        state.block = true;
        return chain(stream, state, twTokenCode);
      }
      if (stream.match(reBlockQuote))
        return 'quote';
      if (stream.match(reWikiCommentStart) || stream.match(reWikiCommentStop))
        return 'comment';
      if (stream.match(reJsCodeStart) || stream.match(reJsCodeStop) || stream.match(reXmlCodeStart) || stream.match(reXmlCodeStop))
        return 'comment';
      if (stream.match(reHR))
        return 'hr';
    }

    stream.next();
    if (sol && /[\/\*!#;:>|]/.test(ch)) {
      if (ch == "!") { // tw header
        stream.skipToEnd();
        return "header";
      }
      if (ch == "*") { // tw list
        stream.eatWhile('*');
        return "comment";
      }
      if (ch == "#") { // tw numbered list
        stream.eatWhile('#');
        return "comment";
      }
      if (ch == ";") { // definition list, term
        stream.eatWhile(';');
        return "comment";
      }
      if (ch == ":") { // definition list, description
        stream.eatWhile(':');
        return "comment";
      }
      if (ch == ">") { // single line quote
        stream.eatWhile(">");
        return "quote";
      }
      if (ch == '|')
        return 'header';
    }

    if (ch == '{' && stream.match(/\{\{/))
      return chain(stream, state, twTokenCode);

    // rudimentary html:// file:// link matching. TW knows much more ...
    if (/[hf]/i.test(ch) &&
        /[ti]/i.test(stream.peek()) &&
        stream.match(/\b(ttps?|tp|ile):\/\/[\-A-Z0-9+&@#\/%?=~_|$!:,.;]*[A-Z0-9+&@#\/%=~_|$]/i))
      return "link";

    // just a little string indicator, don't want to have the whole string covered
    if (ch == '"')
      return 'string';

    if (ch == '~')    // _no_ CamelCase indicator should be bold
      return 'brace';

    if (/[\[\]]/.test(ch) && stream.match(ch)) // check for [[..]]
      return 'brace';

    if (ch == "@") {    // check for space link. TODO fix @@...@@ highlighting
      stream.eatWhile(isSpaceName);
      return "link";
    }

    if (/\d/.test(ch)) {        // numbers
      stream.eatWhile(/\d/);
      return "number";
    }

    if (ch == "/") { // tw invisible comment
      if (stream.eat("%")) {
        return chain(stream, state, twTokenComment);
      } else if (stream.eat("/")) { //
        return chain(stream, state, twTokenEm);
      }
    }

    if (ch == "_" && stream.eat("_")) // tw underline
        return chain(stream, state, twTokenUnderline);

    // strikethrough and mdash handling
    if (ch == "-" && stream.eat("-")) {
      // if strikethrough looks ugly, change CSS.
      if (stream.peek() != ' ')
        return chain(stream, state, twTokenStrike);
      // mdash
      if (stream.peek() == ' ')
        return 'brace';
    }

    if (ch == "'" && stream.eat("'")) // tw bold
      return chain(stream, state, twTokenStrong);

    if (ch == "<" && stream.eat("<")) // tw macro
      return chain(stream, state, twTokenMacro);

    // core macro handling
    stream.eatWhile(/[\w\$_]/);
    return textwords.propertyIsEnumerable(stream.current()) ? "keyword" : null
  }

  // tw invisible comment
  function twTokenComment(stream, state) {
    var maybeEnd = false, ch;
    while (ch = stream.next()) {
      if (ch == "/" && maybeEnd) {
        state.tokenize = tokenBase;
        break;
      }
      maybeEnd = (ch == "%");
    }
    return "comment";
  }

  // tw strong / bold
  function twTokenStrong(stream, state) {
    var maybeEnd = false,
    ch;
    while (ch = stream.next()) {
      if (ch == "'" && maybeEnd) {
        state.tokenize = tokenBase;
        break;
      }
      maybeEnd = (ch == "'");
    }
    return "strong";
  }

  // tw code
  function twTokenCode(stream, state) {
    var sb = state.block;

    if (sb && stream.current()) {
      return "comment";
    }

    if (!sb && stream.match(reUntilCodeStop)) {
      state.tokenize = tokenBase;
      return "comment";
    }

    if (sb && stream.sol() && stream.match(reCodeBlockStop)) {
      state.tokenize = tokenBase;
      return "comment";
    }

    stream.next();
    return "comment";
  }

  // tw em / italic
  function twTokenEm(stream, state) {
    var maybeEnd = false,
    ch;
    while (ch = stream.next()) {
      if (ch == "/" && maybeEnd) {
        state.tokenize = tokenBase;
        break;
      }
      maybeEnd = (ch == "/");
    }
    return "em";
  }

  // tw underlined text
  function twTokenUnderline(stream, state) {
    var maybeEnd = false,
    ch;
    while (ch = stream.next()) {
      if (ch == "_" && maybeEnd) {
        state.tokenize = tokenBase;
        break;
      }
      maybeEnd = (ch == "_");
    }
    return "underlined";
  }

  // tw strike through text looks ugly
  // change CSS if needed
  function twTokenStrike(stream, state) {
    var maybeEnd = false, ch;

    while (ch = stream.next()) {
      if (ch == "-" && maybeEnd) {
        state.tokenize = tokenBase;
        break;
      }
      maybeEnd = (ch == "-");
    }
    return "strikethrough";
  }

  // macro
  function twTokenMacro(stream, state) {
    if (stream.current() == '<<') {
      return 'macro';
    }

    var ch = stream.next();
    if (!ch) {
      state.tokenize = tokenBase;
      return null;
    }
    if (ch == ">") {
      if (stream.peek() == '>') {
        stream.next();
        state.tokenize = tokenBase;
        return "macro";
      }
    }

    stream.eatWhile(/[\w\$_]/);
    return keywords.propertyIsEnumerable(stream.current()) ? "keyword" : null
  }

  // Interface
  return {
    startState: function () {
      return {tokenize: tokenBase};
    },

    token: function (stream, state) {
      if (stream.eatSpace()) return null;
      var style = state.tokenize(stream, state);
      return style;
    }
  };
});

CodeMirror.defineMIME("text/x-tiddlywiki", "tiddlywiki");
});