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Name	Size	Permission
AbstractRange-impl.js	965 B	-rw-r--r--
Range-impl.js	26.28 KB	-rw-r--r--
StaticRange-impl.js	1.08 KB	-rw-r--r--
boundary-point.js	1.1 KB	-rw-r--r--

Code Editor : boundary-point.js

"use strict";

const { domSymbolTree } = require("../helpers/internal-constants");
const { nodeRoot, isFollowing, isInclusiveAncestor } = require("../helpers/node");

// Returns 0 if equal, +1 for after and -1 for before
// https://dom.spec.whatwg.org/#concept-range-bp-after
function compareBoundaryPointsPosition(bpA, bpB) {
  const { node: nodeA, offset: offsetA } = bpA;
  const { node: nodeB, offset: offsetB } = bpB;

if (nodeRoot(nodeA) !== nodeRoot(nodeB)) {
    throw new Error(`Internal Error: Boundary points should have the same root!`);
  }

if (nodeA === nodeB) {
    if (offsetA === offsetB) {
      return 0;
    } else if (offsetA < offsetB) {
      return -1;
    }

return 1;
  }

if (isFollowing(nodeA, nodeB)) {
    return compareBoundaryPointsPosition(bpB, bpA) === -1 ? 1 : -1;
  }

if (isInclusiveAncestor(nodeA, nodeB)) {
    let child = nodeB;

while (domSymbolTree.parent(child) !== nodeA) {
      child = domSymbolTree.parent(child);
    }

if (domSymbolTree.index(child) < offsetA) {
      return 1;
    }
  }

return -1;
}

module.exports = {
  compareBoundaryPointsPosition
};

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Code Editor : boundary-point.js

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