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52 lines
1.8 KiB
52 lines
1.8 KiB
5 years ago
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// Utility function that allows modes to be combined. The mode given
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// as the base argument takes care of most of the normal mode
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// functionality, but a second (typically simple) mode is used, which
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// can override the style of text. Both modes get to parse all of the
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// text, but when both assign a non-null style to a piece of code, the
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// overlay wins, unless the combine argument was true, in which case
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// the styles are combined.
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CodeMirror.overlayParser = function(base, overlay, combine) {
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return {
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startState: function() {
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return {
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base: CodeMirror.startState(base),
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overlay: CodeMirror.startState(overlay),
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basePos: 0, baseCur: null,
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overlayPos: 0, overlayCur: null
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};
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},
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copyState: function(state) {
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return {
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base: CodeMirror.copyState(base, state.base),
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overlay: CodeMirror.copyState(overlay, state.overlay),
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basePos: state.basePos, baseCur: null,
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overlayPos: state.overlayPos, overlayCur: null
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};
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},
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token: function(stream, state) {
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if (stream.start == state.basePos) {
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state.baseCur = base.token(stream, state.base);
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state.basePos = stream.pos;
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}
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if (stream.start == state.overlayPos) {
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stream.pos = stream.start;
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state.overlayCur = overlay.token(stream, state.overlay);
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state.overlayPos = stream.pos;
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}
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stream.pos = Math.min(state.basePos, state.overlayPos);
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if (stream.eol()) state.basePos = state.overlayPos = 0;
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if (state.overlayCur == null) return state.baseCur;
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if (state.baseCur != null && combine) return state.baseCur + " " + state.overlayCur;
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else return state.overlayCur;
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},
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indent: function(state, textAfter) {
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return base.indent(state.base, textAfter);
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},
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electricChars: base.electricChars
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};
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};
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