(function (mod){ 
if (typeof exports == "object" && typeof module == "object") mod(require("../../lib/codemirror")); 
 else if (typeof define == "function" && define.amd) define(["../../lib/codemirror"] , mod); 
 else mod(CodeMirror); 
} 
)(function (CodeMirror){ 
"use strict"; 
CodeMirror.overlayMode = function (base, overlay, combine){ 
return { 
startState: function (){ 
return { 
base: CodeMirror.startState(base),
overlay: CodeMirror.startState(overlay),
basePos: 0,
baseCur: null ,
overlayPos: 0,
overlayCur: null ,
streamSeen: null }
; 
} 
,
copyState: function (state){ 
return { 
base: CodeMirror.copyState(base, state.base),
overlay: CodeMirror.copyState(overlay, state.overlay),
basePos: state.basePos,
baseCur: null ,
overlayPos: state.overlayPos,
overlayCur: null }
; 
} 
,
token: function (stream, state){ 
if (stream != state.streamSeen || Math.min(state.basePos, state.overlayPos) < stream.start) { 
state.streamSeen = stream; 
state.basePos = state.overlayPos = stream.start; 
} 
if (stream.start == state.basePos) { 
state.baseCur = base.token(stream, state.base); 
state.basePos = stream.pos; 
} 
if (stream.start == state.overlayPos) { 
stream.pos = stream.start; 
state.overlayCur = overlay.token(stream, state.overlay); 
state.overlayPos = stream.pos; 
} 
stream.pos = Math.min(state.basePos, state.overlayPos); 
if (state.overlayCur == null ) return state.baseCur; 
 else if (state.baseCur != null  && state.overlay.combineTokens || combine && state.overlay.combineTokens == null ) return state.baseCur + " " + state.overlayCur; 
 else return state.overlayCur; 
} 
,
indent: base.indent && function (state, textAfter){ 
return base.indent(state.base, textAfter); 
} 
,
electricChars: base.electricChars,
innerMode: function (state){ 
return { 
state: state.base,
mode: base}
; 
} 
,
blankLine: function (state){ 
if (base.blankLine) base.blankLine(state.base); 
if (overlay.blankLine) overlay.blankLine(state.overlay); 
} 
}
; 
} 
; 
} 
);