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

// Author: Aliaksei Chapyzhenka

(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";

function toWordList(words) {
    var ret = [];
    words.split(' ').forEach(function(e){
      ret.push({name: e});
    });
    return ret;
  }

var coreWordList = toWordList(
'INVERT AND OR XOR\
 2* 2/ LSHIFT RSHIFT\
 0= = 0< < > U< MIN MAX\
 2DROP 2DUP 2OVER 2SWAP ?DUP DEPTH DROP DUP OVER ROT SWAP\
 >R R> R@\
 + - 1+ 1- ABS NEGATE\
 S>D * M* UM*\
 FM/MOD SM/REM UM/MOD */ */MOD / /MOD MOD\
 HERE , @ ! CELL+ CELLS C, C@ C! CHARS 2@ 2!\
 ALIGN ALIGNED +! ALLOT\
 CHAR [CHAR] [ ] BL\
 FIND EXECUTE IMMEDIATE COUNT LITERAL STATE\
 ; DOES> >BODY\
 EVALUATE\
 SOURCE >IN\
 <# # #S #> HOLD SIGN BASE >NUMBER HEX DECIMAL\
 FILL MOVE\
 . CR EMIT SPACE SPACES TYPE U. .R U.R\
 ACCEPT\
 TRUE FALSE\
 <> U> 0<> 0>\
 NIP TUCK ROLL PICK\
 2>R 2R@ 2R>\
 WITHIN UNUSED MARKER\
 I J\
 TO\
 COMPILE, [COMPILE]\
 SAVE-INPUT RESTORE-INPUT\
 PAD ERASE\
 2LITERAL DNEGATE\
 D- D+ D0< D0= D2* D2/ D< D= DMAX DMIN D>S DABS\
 M+ M*/ D. D.R 2ROT DU<\
 CATCH THROW\
 FREE RESIZE ALLOCATE\
 CS-PICK CS-ROLL\
 GET-CURRENT SET-CURRENT FORTH-WORDLIST GET-ORDER SET-ORDER\
 PREVIOUS SEARCH-WORDLIST WORDLIST FIND ALSO ONLY FORTH DEFINITIONS ORDER\
 -TRAILING /STRING SEARCH COMPARE CMOVE CMOVE> BLANK SLITERAL');

var immediateWordList = toWordList('IF ELSE THEN BEGIN WHILE REPEAT UNTIL RECURSE [IF] [ELSE] [THEN] ?DO DO LOOP +LOOP UNLOOP LEAVE EXIT AGAIN CASE OF ENDOF ENDCASE');

CodeMirror.defineMode('forth', function() {
    function searchWordList (wordList, word) {
      var i;
      for (i = wordList.length - 1; i >= 0; i--) {
        if (wordList[i].name === word.toUpperCase()) {
          return wordList[i];
        }
      }
      return undefined;
    }
  return {
    startState: function() {
      return {
        state: '',
        base: 10,
        coreWordList: coreWordList,
        immediateWordList: immediateWordList,
        wordList: []
      };
    },
    token: function (stream, stt) {
      var mat;
      if (stream.eatSpace()) {
        return null;
      }
      if (stt.state === '') { // interpretation
        if (stream.match(/^(\]|:NONAME)(\s|$)/i)) {
          stt.state = ' compilation';
          return 'builtin compilation';
        }
        mat = stream.match(/^(\:)\s+(\S+)(\s|$)+/);
        if (mat) {
          stt.wordList.push({name: mat[2].toUpperCase()});
          stt.state = ' compilation';
          return 'def' + stt.state;
        }
        mat = stream.match(/^(VARIABLE|2VARIABLE|CONSTANT|2CONSTANT|CREATE|POSTPONE|VALUE|WORD)\s+(\S+)(\s|$)+/i);
        if (mat) {
          stt.wordList.push({name: mat[2].toUpperCase()});
          return 'def' + stt.state;
        }
        mat = stream.match(/^(\'|\[\'\])\s+(\S+)(\s|$)+/);
        if (mat) {
          return 'builtin' + stt.state;
        }
        } else { // compilation
        // ; [
        if (stream.match(/^(\;|\[)(\s)/)) {
          stt.state = '';
          stream.backUp(1);
          return 'builtin compilation';
        }
        if (stream.match(/^(\;|\[)($)/)) {
          stt.state = '';
          return 'builtin compilation';
        }
        if (stream.match(/^(POSTPONE)\s+\S+(\s|$)+/)) {
          return 'builtin';
        }
      }

// dynamic wordlist
      mat = stream.match(/^(\S+)(\s+|$)/);
      if (mat) {
        if (searchWordList(stt.wordList, mat[1]) !== undefined) {
          return 'variable' + stt.state;
        }

// comments
        if (mat[1] === '\\') {
          stream.skipToEnd();
            return 'comment' + stt.state;
          }

// core words
          if (searchWordList(stt.coreWordList, mat[1]) !== undefined) {
            return 'builtin' + stt.state;
          }
          if (searchWordList(stt.immediateWordList, mat[1]) !== undefined) {
            return 'keyword' + stt.state;
          }

if (mat[1] === '(') {
            stream.eatWhile(function (s) { return s !== ')'; });
            stream.eat(')');
            return 'comment' + stt.state;
          }

// // strings
          if (mat[1] === '.(') {
            stream.eatWhile(function (s) { return s !== ')'; });
            stream.eat(')');
            return 'string' + stt.state;
          }
          if (mat[1] === 'S"' || mat[1] === '."' || mat[1] === 'C"') {
            stream.eatWhile(function (s) { return s !== '"'; });
            stream.eat('"');
            return 'string' + stt.state;
          }

// numbers
          if (mat[1] - 0xfffffffff) {
            return 'number' + stt.state;
          }
          // if (mat[1].match(/^[-+]?[0-9]+\.[0-9]*/)) {
          //     return 'number' + stt.state;
          // }

return 'atom' + stt.state;
        }
      }
    };
  });
  CodeMirror.defineMIME("text/x-forth", "forth");
});