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   1  // CodeMirror, copyright (c) by Marijn Haverbeke and others
   2  // Distributed under an MIT license: https://codemirror.net/5/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, line) {
  72        return base.indent(state.base, textAfter, line);
  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  });