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

CodeMirror.defineMode("sass", function(config) {
  var cssMode = CodeMirror.mimeModes["text/css"];
  var propertyKeywords = cssMode.propertyKeywords || {},
      colorKeywords = cssMode.colorKeywords || {},
      valueKeywords = cssMode.valueKeywords || {},
      fontProperties = cssMode.fontProperties || {};

function tokenRegexp(words) {
    return new RegExp("^" + words.join("|"));
  }

var keywords = ["true", "false", "null", "auto"];
  var keywordsRegexp = new RegExp("^" + keywords.join("|"));

var operators = ["\$", "\$", "=", ">", "<", "==", ">=", "<=", "\\+", "-",
                   "\\!=", "/", "\\*", "%", "and", "or", "not", ";","\\{","\\}",":"];
  var opRegexp = tokenRegexp(operators);

var pseudoElementsRegexp = /^::?[a-zA-Z_][\w\-]*/;

var word;

function isEndLine(stream) {
    return !stream.peek() || stream.match(/\s+$/, false);
  }

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

if (ch === ")") {
      stream.next();
      state.tokenizer = tokenBase;
      return "operator";
    } else if (ch === "(") {
      stream.next();
      stream.eatSpace();

return "operator";
    } else if (ch === "'" || ch === '"') {
      state.tokenizer = buildStringTokenizer(stream.next());
      return "string";
    } else {
      state.tokenizer = buildStringTokenizer(")", false);
      return "string";
    }
  }
  function comment(indentation, multiLine) {
    return function(stream, state) {
      if (stream.sol() && stream.indentation() <= indentation) {
        state.tokenizer = tokenBase;
        return tokenBase(stream, state);
      }

if (multiLine && stream.skipTo("*/")) {
        stream.next();
        stream.next();
        state.tokenizer = tokenBase;
      } else {
        stream.skipToEnd();
      }

return "comment";
    };
  }

function buildStringTokenizer(quote, greedy) {
    if (greedy == null) { greedy = true; }

function stringTokenizer(stream, state) {
      var nextChar = stream.next();
      var peekChar = stream.peek();
      var previousChar = stream.string.charAt(stream.pos-2);

var endingString = ((nextChar !== "\\" && peekChar === quote) || (nextChar === quote && previousChar !== "\\"));

if (endingString) {
        if (nextChar !== quote && greedy) { stream.next(); }
        if (isEndLine(stream)) {
          state.cursorHalf = 0;
        }
        state.tokenizer = tokenBase;
        return "string";
      } else if (nextChar === "#" && peekChar === "{") {
        state.tokenizer = buildInterpolationTokenizer(stringTokenizer);
        stream.next();
        return "operator";
      } else {
        return "string";
      }
    }

return stringTokenizer;
  }

function dedent(state) {
    if (state.scopes.length == 1) return;

state.scopes.shift();
  }

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

// Comment
    if (stream.match("/*")) {
      state.tokenizer = comment(stream.indentation(), true);
      return state.tokenizer(stream, state);
    }
    if (stream.match("//")) {
      state.tokenizer = comment(stream.indentation(), false);
      return state.tokenizer(stream, state);
    }

// Interpolation
    if (stream.match("#{")) {
      state.tokenizer = buildInterpolationTokenizer(tokenBase);
      return "operator";
    }

// Strings
    if (ch === '"' || ch === "'") {
      stream.next();
      state.tokenizer = buildStringTokenizer(ch);
      return "string";
    }

if(!state.cursorHalf){// state.cursorHalf === 0
    // first half i.e. before : for key-value pairs
    // including selectors

if (ch === "-") {
        if (stream.match(/^-\w+-/)) {
          return "meta";
        }
      }

if (ch === ".") {
        stream.next();
        if (stream.match(/^[\w-]+/)) {
          indent(state);
          return "qualifier";
        } else if (stream.peek() === "#") {
          indent(state);
          return "tag";
        }
      }

if (ch === "#") {
        stream.next();
        // ID selectors
        if (stream.match(/^[\w-]+/)) {
          indent(state);
          return "builtin";
        }
        if (stream.peek() === "#") {
          indent(state);
          return "tag";
        }
      }

// Variables
      if (ch === "$") {
        stream.next();
        stream.eatWhile(/[\w-]/);
        return "variable-2";
      }

// Numbers
      if (stream.match(/^-?[0-9\.]+/))
        return "number";

// Units
      if (stream.match(/^(px|em|in)\b/))
        return "unit";

if (stream.match(keywordsRegexp))
        return "keyword";

if (stream.match(/^url/) && stream.peek() === "(") {
        state.tokenizer = urlTokens;
        return "atom";
      }

if (ch === "=") {
        // Match shortcut mixin definition
        if (stream.match(/^=[\w-]+/)) {
          indent(state);
          return "meta";
        }
      }

if (ch === "+") {
        // Match shortcut mixin definition
        if (stream.match(/^\+[\w-]+/)){
          return "variable-3";
        }
      }

if(ch === "@"){
        if(stream.match('@extend')){
          if(!stream.match(/\s*[\w]/))
            dedent(state);
        }
      }

// Indent Directives
      if (stream.match(/^@(else if|if|media|else|for|each|while|mixin|function)/)) {
        indent(state);
        return "def";
      }

// Other Directives
      if (ch === "@") {
        stream.next();
        stream.eatWhile(/[\w-]/);
        return "def";
      }

if (stream.eatWhile(/[\w-]/)){
        if(stream.match(/ *: *[\w-\+\$#!\("']/,false)){
          word = stream.current().toLowerCase();
          var prop = state.prevProp + "-" + word;
          if (propertyKeywords.hasOwnProperty(prop)) {
            return "property";
          } else if (propertyKeywords.hasOwnProperty(word)) {
            state.prevProp = word;
            return "property";
          } else if (fontProperties.hasOwnProperty(word)) {
            return "property";
          }
          return "tag";
        }
        else if(stream.match(/ *:/,false)){
          indent(state);
          state.cursorHalf = 1;
          state.prevProp = stream.current().toLowerCase();
          return "property";
        }
        else if(stream.match(/ *,/,false)){
          return "tag";
        }
        else{
          indent(state);
          return "tag";
        }
      }

if(ch === ":"){
        if (stream.match(pseudoElementsRegexp)){ // could be a pseudo-element
          return "variable-3";
        }
        stream.next();
        state.cursorHalf=1;
        return "operator";
      }

} // cursorHalf===0 ends here
    else{

if (ch === "#") {
        stream.next();
        // Hex numbers
        if (stream.match(/[0-9a-fA-F]{6}|[0-9a-fA-F]{3}/)){
          if (isEndLine(stream)) {
            state.cursorHalf = 0;
          }
          return "number";
        }
      }

// Numbers
      if (stream.match(/^-?[0-9\.]+/)){
        if (isEndLine(stream)) {
          state.cursorHalf = 0;
        }
        return "number";
      }

// Units
      if (stream.match(/^(px|em|in)\b/)){
        if (isEndLine(stream)) {
          state.cursorHalf = 0;
        }
        return "unit";
      }

if (stream.match(keywordsRegexp)){
        if (isEndLine(stream)) {
          state.cursorHalf = 0;
        }
        return "keyword";
      }

if (stream.match(/^url/) && stream.peek() === "(") {
        state.tokenizer = urlTokens;
        if (isEndLine(stream)) {
          state.cursorHalf = 0;
        }
        return "atom";
      }

// Variables
      if (ch === "$") {
        stream.next();
        stream.eatWhile(/[\w-]/);
        if (isEndLine(stream)) {
          state.cursorHalf = 0;
        }
        return "variable-2";
      }

// bang character for !important, !default, etc.
      if (ch === "!") {
        stream.next();
        state.cursorHalf = 0;
        return stream.match(/^[\w]+/) ? "keyword": "operator";
      }

if (stream.match(opRegexp)){
        if (isEndLine(stream)) {
          state.cursorHalf = 0;
        }
        return "operator";
      }

// attributes
      if (stream.eatWhile(/[\w-]/)) {
        if (isEndLine(stream)) {
          state.cursorHalf = 0;
        }
        word = stream.current().toLowerCase();
        if (valueKeywords.hasOwnProperty(word)) {
          return "atom";
        } else if (colorKeywords.hasOwnProperty(word)) {
          return "keyword";
        } else if (propertyKeywords.hasOwnProperty(word)) {
          state.prevProp = stream.current().toLowerCase();
          return "property";
        } else {
          return "tag";
        }
      }

//stream.eatSpace();
      if (isEndLine(stream)) {
        state.cursorHalf = 0;
        return null;
      }

} // else ends here

if (stream.match(opRegexp))
      return "operator";

// If we haven't returned by now, we move 1 character
    // and return an error
    stream.next();
    return null;
  }

function tokenLexer(stream, state) {
    if (stream.sol()) state.indentCount = 0;
    var style = state.tokenizer(stream, state);
    var current = stream.current();

if (current === "@return" || current === "}"){
      dedent(state);
    }

if (style !== null) {
      var startOfToken = stream.pos - current.length;

var withCurrentIndent = startOfToken + (config.indentUnit * state.indentCount);

var newScopes = [];

for (var i = 0; i < state.scopes.length; i++) {
        var scope = state.scopes[i];

if (scope.offset <= withCurrentIndent)
          newScopes.push(scope);
      }

state.scopes = newScopes;
    }

return style;
  }

return {
    startState: function() {
      return {
        tokenizer: tokenBase,
        scopes: [{offset: 0, type: "sass"}],
        indentCount: 0,
        cursorHalf: 0,  // cursor half tells us if cursor lies after (1)
                        // or before (0) colon (well... more or less)
        definedVars: [],
        definedMixins: []
      };
    },
    token: function(stream, state) {
      var style = tokenLexer(stream, state);

state.lastToken = { style: style, content: stream.current() };

return style;
    },

indent: function(state) {
      return state.scopes[0].offset;
    },

blockCommentStart: "/*",
    blockCommentEnd: "*/",
    lineComment: "//",
    fold: "indent"
  };
}, "css");

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

});