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overlay.js (3228B)

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