// 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, in which case // the styles are combined. // overlayParser is the old, deprecated name CodeMirror.overlayMode = CodeMirror.overlayParser = function(base, overlay, combine) { return { startState: function() { return { base: CodeMirror.startState(base), overlay: CodeMirror.startState(overlay), basePos: 0, baseCur: null, overlayPos: 0, overlayCur: 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.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 (stream.eol()) state.basePos = state.overlayPos = 0; if (state.overlayCur == null) return state.baseCur; if (state.baseCur != null && combine) 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}; } }; };