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

(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('shell', function() {

  var words = {};
  function define(style, dict) {
    for(var i = 0; i < dict.length; i++) {
      words[dict[i]] = style;
    }
  };

  var commonAtoms = ["true", "false"];
  var commonKeywords = ["if", "then", "do", "else", "elif", "while", "until", "for", "in", "esac", "fi",
    "fin", "fil", "done", "exit", "set", "unset", "export", "function"];
  var commonCommands = ["ab", "awk", "bash", "beep", "cat", "cc", "cd", "chown", "chmod", "chroot", "clear",
    "cp", "curl", "cut", "diff", "echo", "find", "gawk", "gcc", "get", "git", "grep", "hg", "kill", "killall",
    "ln", "ls", "make", "mkdir", "openssl", "mv", "nc", "nl", "node", "npm", "ping", "ps", "restart", "rm",
    "rmdir", "sed", "service", "sh", "shopt", "shred", "source", "sort", "sleep", "ssh", "start", "stop",
    "su", "sudo", "svn", "tee", "telnet", "top", "touch", "vi", "vim", "wall", "wc", "wget", "who", "write",
    "yes", "zsh"];

  CodeMirror.registerHelper("hintWords", "shell", commonAtoms.concat(commonKeywords, commonCommands));

  define('atom', commonAtoms);
  define('keyword', commonKeywords);
  define('builtin', commonCommands);

  function tokenBase(stream, state) {
    if (stream.eatSpace()) return null;

    var sol = stream.sol();
    var ch = stream.next();

    if (ch === '\\') {
      stream.next();
      return null;
    }
    if (ch === '\'' || ch === '"' || ch === '`') {
      state.tokens.unshift(tokenString(ch, ch === "`" ? "quote" : "string"));
      return tokenize(stream, state);
    }
    if (ch === '#') {
      if (sol && stream.eat('!')) {
        stream.skipToEnd();
        return 'meta'; // 'comment'?
      }
      stream.skipToEnd();
      return 'comment';
    }
    if (ch === '$') {
      state.tokens.unshift(tokenDollar);
      return tokenize(stream, state);
    }
    if (ch === '+' || ch === '=') {
      return 'operator';
    }
    if (ch === '-') {
      stream.eat('-');
      stream.eatWhile(/\w/);
      return 'attribute';
    }
    if (/\d/.test(ch)) {
      stream.eatWhile(/\d/);
      if(stream.eol() || !/\w/.test(stream.peek())) {
        return 'number';
      }
    }
    stream.eatWhile(/[\w-]/);
    var cur = stream.current();
    if (stream.peek() === '=' && /\w+/.test(cur)) return 'def';
    return words.hasOwnProperty(cur) ? words[cur] : null;
  }

  function tokenString(quote, style) {
    var close = quote == "(" ? ")" : quote == "{" ? "}" : quote
    return function(stream, state) {
      var next, escaped = false;
      while ((next = stream.next()) != null) {
        if (next === close && !escaped) {
          state.tokens.shift();
          break;
        } else if (next === '$' && !escaped && quote !== "'" && stream.peek() != close) {
          escaped = true;
          stream.backUp(1);
          state.tokens.unshift(tokenDollar);
          break;
        } else if (!escaped && quote !== close && next === quote) {
          state.tokens.unshift(tokenString(quote, style))
          return tokenize(stream, state)
        } else if (!escaped && /['"]/.test(next) && !/['"]/.test(quote)) {
          state.tokens.unshift(tokenStringStart(next, "string"));
          stream.backUp(1);
          break;
        }
        escaped = !escaped && next === '\\';
      }
      return style;
    };
  };

  function tokenStringStart(quote, style) {
    return function(stream, state) {
      state.tokens[0] = tokenString(quote, style)
      stream.next()
      return tokenize(stream, state)
    }
  }

  var tokenDollar = function(stream, state) {
    if (state.tokens.length > 1) stream.eat('$');
    var ch = stream.next()
    if (/['"({]/.test(ch)) {
      state.tokens[0] = tokenString(ch, ch == "(" ? "quote" : ch == "{" ? "def" : "string");
      return tokenize(stream, state);
    }
    if (!/\d/.test(ch)) stream.eatWhile(/\w/);
    state.tokens.shift();
    return 'def';
  };

  function tokenize(stream, state) {
    return (state.tokens[0] || tokenBase) (stream, state);
  };

  return {
    startState: function() {return {tokens:[]};},
    token: function(stream, state) {
      return tokenize(stream, state);
    },
    closeBrackets: "()[]{}''\"\"``",
    lineComment: '#',
    fold: "brace"
  };
});

CodeMirror.defineMIME('text/x-sh', 'shell');
// Apache uses a slightly different Media Type for Shell scripts
// http://svn.apache.org/repos/asf/httpd/httpd/trunk/docs/conf/mime.types
CodeMirror.defineMIME('application/x-sh', 'shell');

});