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

/*
  This MUMPS Language script was constructed using vbscript.js as a template.
*/

(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("mumps", function() {
    function wordRegexp(words) {
      return new RegExp("^((" + words.join(")|(") + "))\\b", "i");
    }

    var singleOperators = new RegExp("^[\\+\\-\\*/&#!_?\\\\<>=\\'\\[\\]]");
    var doubleOperators = new RegExp("^(('=)|(<=)|(>=)|('>)|('<)|([[)|(]])|(^$))");
    var singleDelimiters = new RegExp("^[\\.,:]");
    var brackets = new RegExp("[()]");
    var identifiers = new RegExp("^[%A-Za-z][A-Za-z0-9]*");
    var commandKeywords = ["break","close","do","else","for","goto", "halt", "hang", "if", "job","kill","lock","merge","new","open", "quit", "read", "set", "tcommit", "trollback", "tstart", "use", "view", "write", "xecute", "b","c","d","e","f","g", "h", "i", "j","k","l","m","n","o", "q", "r", "s", "tc", "tro", "ts", "u", "v", "w", "x"];
    // The following list includes instrinsic functions _and_ special variables
    var intrinsicFuncsWords = ["\\$ascii", "\\$char", "\\$data", "\\$ecode", "\\$estack", "\\$etrap", "\\$extract", "\\$find", "\\$fnumber", "\\$get", "\\$horolog", "\\$io", "\\$increment", "\\$job", "\\$justify", "\\$length", "\\$name", "\\$next", "\\$order", "\\$piece", "\\$qlength", "\\$qsubscript", "\\$query", "\\$quit", "\\$random", "\\$reverse", "\\$select", "\\$stack", "\\$test", "\\$text", "\\$translate", "\\$view", "\\$x", "\\$y", "\\$a", "\\$c", "\\$d", "\\$e", "\\$ec", "\\$es", "\\$et", "\\$f", "\\$fn", "\\$g", "\\$h", "\\$i", "\\$j", "\\$l", "\\$n", "\\$na", "\\$o", "\\$p", "\\$q", "\\$ql", "\\$qs", "\\$r", "\\$re", "\\$s", "\\$st", "\\$t", "\\$tr", "\\$v", "\\$z"];
    var intrinsicFuncs = wordRegexp(intrinsicFuncsWords);
    var command = wordRegexp(commandKeywords);

    function tokenBase(stream, state) {
      if (stream.sol()) {
        state.label = true;
        state.commandMode = 0;
      }

      // The <space> character has meaning in MUMPS. Ignoring consecutive
      // spaces would interfere with interpreting whether the next non-space
      // character belongs to the command or argument context.

      // Examine each character and update a mode variable whose interpretation is:
      //   >0 => command    0 => argument    <0 => command post-conditional
      var ch = stream.peek();

      if (ch == " " || ch == "\t") { // Pre-process <space>
        state.label = false;
        if (state.commandMode == 0)
          state.commandMode = 1;
        else if ((state.commandMode < 0) || (state.commandMode == 2))
          state.commandMode = 0;
      } else if ((ch != ".") && (state.commandMode > 0)) {
        if (ch == ":")
          state.commandMode = -1;   // SIS - Command post-conditional
        else
          state.commandMode = 2;
      }

      // Do not color parameter list as line tag
      if ((ch === "(") || (ch === "\u0009"))
        state.label = false;

      // MUMPS comment starts with ";"
      if (ch === ";") {
        stream.skipToEnd();
        return "comment";
      }

      // Number Literals // SIS/RLM - MUMPS permits canonic number followed by concatenate operator
      if (stream.match(/^[-+]?\d+(\.\d+)?([eE][-+]?\d+)?/))
        return "number";

      // Handle Strings
      if (ch == '"') {
        if (stream.skipTo('"')) {
          stream.next();
          return "string";
        } else {
          stream.skipToEnd();
          return "error";
        }
      }

      // Handle operators and Delimiters
      if (stream.match(doubleOperators) || stream.match(singleOperators))
        return "operator";

      // Prevents leading "." in DO block from falling through to error
      if (stream.match(singleDelimiters))
        return null;

      if (brackets.test(ch)) {
        stream.next();
        return "bracket";
      }

      if (state.commandMode > 0 && stream.match(command))
        return "variable-2";

      if (stream.match(intrinsicFuncs))
        return "builtin";

      if (stream.match(identifiers))
        return "variable";

      // Detect dollar-sign when not a documented intrinsic function
      // "^" may introduce a GVN or SSVN - Color same as function
      if (ch === "$" || ch === "^") {
        stream.next();
        return "builtin";
      }

      // MUMPS Indirection
      if (ch === "@") {
        stream.next();
        return "string-2";
      }

      if (/[\w%]/.test(ch)) {
        stream.eatWhile(/[\w%]/);
        return "variable";
      }

      // Handle non-detected items
      stream.next();
      return "error";
    }

    return {
      startState: function() {
        return {
          label: false,
          commandMode: 0
        };
      },

      token: function(stream, state) {
        var style = tokenBase(stream, state);
        if (state.label) return "tag";
        return style;
      }
    };
  });

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