third_party/WebKit/Source/devtools/front_end/cm/overlay.js

   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         lineSeen: 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.sol() || stream.string != state.lineSeen ||
  45           Math.min(state.basePos, state.overlayPos) < stream.start) {
  46         state.lineSeen = stream.string;
  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       if (base.blankLine) base.blankLine(state.base);
  80       if (overlay.blankLine) overlay.blankLine(state.overlay);
  81     }
  82   };
  83 };
  84
  85 });