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// CodeMirror, copyright (c) by Marijn Haverbeke and others
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// Distributed under an MIT license: https://codemirror.net/LICENSE
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(function(mod) {
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  if (typeof exports == "object" && typeof module == "object") // CommonJS
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    mod(require("../../lib/codemirror"));
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  else if (typeof define == "function" && define.amd) // AMD
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    define(["../../lib/codemirror"], mod);
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  else // Plain browser env
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    mod(CodeMirror);
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})(function(CodeMirror) {
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"use strict";
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CodeMirror.multiplexingMode = function(outer /*, others */) {
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  // Others should be {open, close, mode [, delimStyle] [, innerStyle] [, parseDelimiters]} objects
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  var others = Array.prototype.slice.call(arguments, 1);
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  function indexOf(string, pattern, from, returnEnd) {
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    if (typeof pattern == "string") {
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      var found = string.indexOf(pattern, from);
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      return returnEnd && found > -1 ? found + pattern.length : found;
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    }
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    var m = pattern.exec(from ? string.slice(from) : string);
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    return m ? m.index + from + (returnEnd ? m[0].length : 0) : -1;
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  }
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  return {
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    startState: function() {
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      return {
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        outer: CodeMirror.startState(outer),
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        innerActive: null,
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        inner: null,
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        startingInner: false
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      };
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    },
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    copyState: function(state) {
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      return {
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        outer: CodeMirror.copyState(outer, state.outer),
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        innerActive: state.innerActive,
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        inner: state.innerActive && CodeMirror.copyState(state.innerActive.mode, state.inner),
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        startingInner: state.startingInner
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      };
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    },
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    token: function(stream, state) {
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      if (!state.innerActive) {
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        var cutOff = Infinity, oldContent = stream.string;
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        for (var i = 0; i < others.length; ++i) {
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          var other = others[i];
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          var found = indexOf(oldContent, other.open, stream.pos);
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          if (found == stream.pos) {
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            if (!other.parseDelimiters) stream.match(other.open);
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            state.startingInner = !!other.parseDelimiters
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            state.innerActive = other;
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            // Get the outer indent, making sure to handle CodeMirror.Pass
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            var outerIndent = 0;
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            if (outer.indent) {
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              var possibleOuterIndent = outer.indent(state.outer, "", "");
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              if (possibleOuterIndent !== CodeMirror.Pass) outerIndent = possibleOuterIndent;
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            }
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            state.inner = CodeMirror.startState(other.mode, outerIndent);
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            return other.delimStyle && (other.delimStyle + " " + other.delimStyle + "-open");
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          } else if (found != -1 && found < cutOff) {
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            cutOff = found;
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          }
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        }
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        if (cutOff != Infinity) stream.string = oldContent.slice(0, cutOff);
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        var outerToken = outer.token(stream, state.outer);
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        if (cutOff != Infinity) stream.string = oldContent;
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        return outerToken;
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      } else {
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        var curInner = state.innerActive, oldContent = stream.string;
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        if (!curInner.close && stream.sol()) {
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          state.innerActive = state.inner = null;
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          return this.token(stream, state);
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        }
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        var found = curInner.close && !state.startingInner ?
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            indexOf(oldContent, curInner.close, stream.pos, curInner.parseDelimiters) : -1;
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        if (found == stream.pos && !curInner.parseDelimiters) {
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          stream.match(curInner.close);
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          state.innerActive = state.inner = null;
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          return curInner.delimStyle && (curInner.delimStyle + " " + curInner.delimStyle + "-close");
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        }
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        if (found > -1) stream.string = oldContent.slice(0, found);
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        var innerToken = curInner.mode.token(stream, state.inner);
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        if (found > -1) stream.string = oldContent;
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        else if (stream.pos > stream.start) state.startingInner = false
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        if (found == stream.pos && curInner.parseDelimiters)
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          state.innerActive = state.inner = null;
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        if (curInner.innerStyle) {
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          if (innerToken) innerToken = innerToken + " " + curInner.innerStyle;
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          else innerToken = curInner.innerStyle;
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        }
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        return innerToken;
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      }
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    },
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    indent: function(state, textAfter, line) {
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      var mode = state.innerActive ? state.innerActive.mode : outer;
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      if (!mode.indent) return CodeMirror.Pass;
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      return mode.indent(state.innerActive ? state.inner : state.outer, textAfter, line);
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    },
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    blankLine: function(state) {
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      var mode = state.innerActive ? state.innerActive.mode : outer;
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      if (mode.blankLine) {
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        mode.blankLine(state.innerActive ? state.inner : state.outer);
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      }
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      if (!state.innerActive) {
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        for (var i = 0; i < others.length; ++i) {
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          var other = others[i];
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          if (other.open === "\n") {
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            state.innerActive = other;
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            state.inner = CodeMirror.startState(other.mode, mode.indent ? mode.indent(state.outer, "", "") : 0);
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          }
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        }
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      } else if (state.innerActive.close === "\n") {
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        state.innerActive = state.inner = null;
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      }
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    },
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    electricChars: outer.electricChars,
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    innerMode: function(state) {
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      return state.inner ? {state: state.inner, mode: state.innerActive.mode} : {state: state.outer, mode: outer};
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    }
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  };
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};
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});
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