GPQAPP

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// CodeMirror, copyright (c) by Marijn Haverbeke and others
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// Distributed under an MIT license: https://codemirror.net/LICENSE
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(function(mod) {
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  if (typeof exports == "object" && typeof module == "object") // CommonJS
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    mod(require("../../lib/codemirror"), require("./foldcode"));
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  else if (typeof define == "function" && define.amd) // AMD
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    define(["../../lib/codemirror", "./foldcode"], mod);
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  else // Plain browser env
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    mod(CodeMirror);
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})(function(CodeMirror) {
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  "use strict";
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  CodeMirror.defineOption("foldGutter", false, function(cm, val, old) {
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    if (old && old != CodeMirror.Init) {
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      cm.clearGutter(cm.state.foldGutter.options.gutter);
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      cm.state.foldGutter = null;
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      cm.off("gutterClick", onGutterClick);
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      cm.off("changes", onChange);
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      cm.off("viewportChange", onViewportChange);
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      cm.off("fold", onFold);
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      cm.off("unfold", onFold);
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      cm.off("swapDoc", onChange);
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    }
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    if (val) {
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      cm.state.foldGutter = new State(parseOptions(val));
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      updateInViewport(cm);
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      cm.on("gutterClick", onGutterClick);
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      cm.on("changes", onChange);
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      cm.on("viewportChange", onViewportChange);
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      cm.on("fold", onFold);
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      cm.on("unfold", onFold);
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      cm.on("swapDoc", onChange);
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    }
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  });
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  var Pos = CodeMirror.Pos;
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  function State(options) {
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    this.options = options;
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    this.from = this.to = 0;
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  }
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  function parseOptions(opts) {
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    if (opts === true) opts = {};
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    if (opts.gutter == null) opts.gutter = "CodeMirror-foldgutter";
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    if (opts.indicatorOpen == null) opts.indicatorOpen = "CodeMirror-foldgutter-open";
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    if (opts.indicatorFolded == null) opts.indicatorFolded = "CodeMirror-foldgutter-folded";
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    return opts;
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  }
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  function isFolded(cm, line) {
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    var marks = cm.findMarks(Pos(line, 0), Pos(line + 1, 0));
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    for (var i = 0; i < marks.length; ++i) {
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      if (marks[i].__isFold) {
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        var fromPos = marks[i].find(-1);
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        if (fromPos && fromPos.line === line)
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          return marks[i];
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      }
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    }
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  }
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  function marker(spec) {
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    if (typeof spec == "string") {
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      var elt = document.createElement("div");
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      elt.className = spec + " CodeMirror-guttermarker-subtle";
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      return elt;
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    } else {
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      return spec.cloneNode(true);
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    }
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  }
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  function updateFoldInfo(cm, from, to) {
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    var opts = cm.state.foldGutter.options, cur = from - 1;
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    var minSize = cm.foldOption(opts, "minFoldSize");
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    var func = cm.foldOption(opts, "rangeFinder");
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    // we can reuse the built-in indicator element if its className matches the new state
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    var clsFolded = typeof opts.indicatorFolded == "string" && classTest(opts.indicatorFolded);
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    var clsOpen = typeof opts.indicatorOpen == "string" && classTest(opts.indicatorOpen);
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    cm.eachLine(from, to, function(line) {
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      ++cur;
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      var mark = null;
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      var old = line.gutterMarkers;
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      if (old) old = old[opts.gutter];
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      if (isFolded(cm, cur)) {
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        if (clsFolded && old && clsFolded.test(old.className)) return;
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        mark = marker(opts.indicatorFolded);
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      } else {
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        var pos = Pos(cur, 0);
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        var range = func && func(cm, pos);
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        if (range && range.to.line - range.from.line >= minSize) {
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          if (clsOpen && old && clsOpen.test(old.className)) return;
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          mark = marker(opts.indicatorOpen);
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        }
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      }
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      if (!mark && !old) return;
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      cm.setGutterMarker(line, opts.gutter, mark);
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    });
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  }
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  // copied from CodeMirror/src/util/dom.js
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  function classTest(cls) { return new RegExp("(^|\\s)" + cls + "(?:$|\\s)\\s*") }
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  function updateInViewport(cm) {
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    var vp = cm.getViewport(), state = cm.state.foldGutter;
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    if (!state) return;
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    cm.operation(function() {
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      updateFoldInfo(cm, vp.from, vp.to);
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    });
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    state.from = vp.from; state.to = vp.to;
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  }
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  function onGutterClick(cm, line, gutter) {
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    var state = cm.state.foldGutter;
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    if (!state) return;
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    var opts = state.options;
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    if (gutter != opts.gutter) return;
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    var folded = isFolded(cm, line);
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    if (folded) folded.clear();
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    else cm.foldCode(Pos(line, 0), opts);
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  }
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  function onChange(cm) {
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    var state = cm.state.foldGutter;
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    if (!state) return;
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    var opts = state.options;
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    state.from = state.to = 0;
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    clearTimeout(state.changeUpdate);
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    state.changeUpdate = setTimeout(function() { updateInViewport(cm); }, opts.foldOnChangeTimeSpan || 600);
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  }
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  function onViewportChange(cm) {
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    var state = cm.state.foldGutter;
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    if (!state) return;
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    var opts = state.options;
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    clearTimeout(state.changeUpdate);
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    state.changeUpdate = setTimeout(function() {
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      var vp = cm.getViewport();
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      if (state.from == state.to || vp.from - state.to > 20 || state.from - vp.to > 20) {
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        updateInViewport(cm);
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      } else {
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        cm.operation(function() {
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          if (vp.from < state.from) {
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            updateFoldInfo(cm, vp.from, state.from);
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            state.from = vp.from;
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          }
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          if (vp.to > state.to) {
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            updateFoldInfo(cm, state.to, vp.to);
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            state.to = vp.to;
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          }
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        });
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      }
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    }, opts.updateViewportTimeSpan || 400);
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  }
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  function onFold(cm, from) {
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    var state = cm.state.foldGutter;
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    if (!state) return;
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    var line = from.line;
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    if (line >= state.from && line < state.to)
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      updateFoldInfo(cm, line, line + 1);
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  }
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});
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