1// Utility function that allows modes to be combined. The mode given 2// as the base argument takes care of most of the normal mode 3// functionality, but a second (typically simple) mode is used, which 4// can override the style of text. Both modes get to parse all of the 5// text, but when both assign a non-null style to a piece of code, the 6// overlay wins, unless the combine argument was true, in which case 7// the styles are combined. 8 9// overlayParser is the old, deprecated name 10CodeMirror.overlayMode = CodeMirror.overlayParser = function(base, overlay, combine) { 11 return { 12 startState: function() { 13 return { 14 base: CodeMirror.startState(base), 15 overlay: CodeMirror.startState(overlay), 16 basePos: 0, baseCur: null, 17 overlayPos: 0, overlayCur: null 18 }; 19 }, 20 copyState: function(state) { 21 return { 22 base: CodeMirror.copyState(base, state.base), 23 overlay: CodeMirror.copyState(overlay, state.overlay), 24 basePos: state.basePos, baseCur: null, 25 overlayPos: state.overlayPos, overlayCur: null 26 }; 27 }, 28 29 token: function(stream, state) { 30 if (stream.start == state.basePos) { 31 state.baseCur = base.token(stream, state.base); 32 state.basePos = stream.pos; 33 } 34 if (stream.start == state.overlayPos) { 35 stream.pos = stream.start; 36 state.overlayCur = overlay.token(stream, state.overlay); 37 state.overlayPos = stream.pos; 38 } 39 stream.pos = Math.min(state.basePos, state.overlayPos); 40 if (stream.eol()) state.basePos = state.overlayPos = 0; 41 42 if (state.overlayCur == null) return state.baseCur; 43 if (state.baseCur != null && combine) return state.baseCur + " " + state.overlayCur; 44 else return state.overlayCur; 45 }, 46 47 indent: base.indent && function(state, textAfter) { 48 return base.indent(state.base, textAfter); 49 }, 50 electricChars: base.electricChars, 51 52 innerMode: function(state) { return {state: state.base, mode: base}; }, 53 54 blankLine: function(state) { 55 if (base.blankLine) base.blankLine(state.base); 56 if (overlay.blankLine) overlay.blankLine(state.overlay); 57 } 58 }; 59}; 60