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1 // CodeMirror, copyright (c) by Marijn Haverbeke and others
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2 // Distributed under an MIT license: https://codemirror.net/5/LICENSE
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3
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4 // Utility function that allows modes to be combined. The mode given
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5 // as the base argument takes care of most of the normal mode
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6 // functionality, but a second (typically simple) mode is used, which
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7 // can override the style of text. Both modes get to parse all of the
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8 // text, but when both assign a non-null style to a piece of code, the
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9 // overlay wins, unless the combine argument was true and not overridden,
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10 // or state.overlay.combineTokens was true, in which case the styles are
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11 // combined.
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12
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13 (function(mod) {
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14 if (typeof exports == "object" && typeof module == "object") // CommonJS
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15 mod(require("../../lib/codemirror"));
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16 else if (typeof define == "function" && define.amd) // AMD
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17 define(["../../lib/codemirror"], mod);
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18 else // Plain browser env
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19 mod(CodeMirror);
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20 })(function(CodeMirror) {
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21 "use strict";
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22
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23 CodeMirror.overlayMode = function(base, overlay, combine) {
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24 return {
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25 startState: function() {
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26 return {
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27 base: CodeMirror.startState(base),
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28 overlay: CodeMirror.startState(overlay),
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29 basePos: 0, baseCur: null,
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30 overlayPos: 0, overlayCur: null,
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31 streamSeen: null
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32 };
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33 },
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34 copyState: function(state) {
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35 return {
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36 base: CodeMirror.copyState(base, state.base),
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37 overlay: CodeMirror.copyState(overlay, state.overlay),
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38 basePos: state.basePos, baseCur: null,
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39 overlayPos: state.overlayPos, overlayCur: null
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40 };
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41 },
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42
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43 token: function(stream, state) {
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44 if (stream != state.streamSeen ||
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45 Math.min(state.basePos, state.overlayPos) < stream.start) {
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46 state.streamSeen = stream;
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47 state.basePos = state.overlayPos = stream.start;
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48 }
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49
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50 if (stream.start == state.basePos) {
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51 state.baseCur = base.token(stream, state.base);
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52 state.basePos = stream.pos;
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53 }
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54 if (stream.start == state.overlayPos) {
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55 stream.pos = stream.start;
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56 state.overlayCur = overlay.token(stream, state.overlay);
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57 state.overlayPos = stream.pos;
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58 }
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59 stream.pos = Math.min(state.basePos, state.overlayPos);
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60
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61 // state.overlay.combineTokens always takes precedence over combine,
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62 // unless set to null
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63 if (state.overlayCur == null) return state.baseCur;
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64 else if (state.baseCur != null &&
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65 state.overlay.combineTokens ||
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66 combine && state.overlay.combineTokens == null)
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67 return state.baseCur + " " + state.overlayCur;
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68 else return state.overlayCur;
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69 },
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70
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71 indent: base.indent && function(state, textAfter, line) {
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72 return base.indent(state.base, textAfter, line);
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73 },
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74 electricChars: base.electricChars,
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75
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76 innerMode: function(state) { return {state: state.base, mode: base}; },
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77
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78 blankLine: function(state) {
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79 var baseToken, overlayToken;
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80 if (base.blankLine) baseToken = base.blankLine(state.base);
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81 if (overlay.blankLine) overlayToken = overlay.blankLine(state.overlay);
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82
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83 return overlayToken == null ?
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84 baseToken :
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85 (combine && baseToken != null ? baseToken + " " + overlayToken : overlayToken);
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86 }
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87 };
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88 };
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89
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90 });
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