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// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: http://codemirror.net/LICENSE
// Utility function that allows modes to be combined. The mode given
// as the base argument takes care of most of the normal mode
// functionality, but a second (typically simple) mode is used, which
// can override the style of text. Both modes get to parse all of the
// text, but when both assign a non-null style to a piece of code, the
// overlay wins, unless the combine argument was true and not overridden,
// or state.overlay.combineTokens was true, in which case the styles are
// combined.
(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.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);
// state.overlay.combineTokens always takes precedence over combine,
// unless set to null
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);
}
};
};
});

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