3e708f9c0b
As far as I know, this is only required for IE at this point, and we have already made changes that removed support of any version of IE.
48 lines
1.7 KiB
JavaScript
48 lines
1.7 KiB
JavaScript
"use strict";
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const anyIntersection = require("./anyIntersection");
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const fill = require("./fill");
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// Merge text part information within a styling fragment
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function assign(textPart, fragment) {
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const fragStart = fragment.start;
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const start = Math.max(fragment.start, textPart.start);
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const end = Math.min(fragment.end, textPart.end);
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return Object.assign({}, fragment, {
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start: start,
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end: end,
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text: fragment.text.slice(start - fragStart, end - fragStart),
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});
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}
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// Merge the style fragments withing the text parts, taking into account
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// boundaries and text sections that have not matched to links or channels.
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// For example, given a string "foobar" where "foo" and "bar" have been
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// identified as parts (channels, links, etc.) and "fo", "ob" and "ar" have 3
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// different styles, the first resulting part will contain fragments "fo" and
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// "o", and the second resulting part will contain "b" and "ar". "o" and "b"
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// fragments will contain duplicate styling attributes.
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function merge(textParts, styleFragments) {
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// Re-build the overall text (without control codes) from the style fragments
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const cleanText = styleFragments.reduce((acc, frag) => acc + frag.text, "");
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// Every section of the original text that has not been captured in a "part"
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// is filled with "text" parts, dummy objects with start/end but no extra
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// metadata.
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const allParts = textParts
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.concat(fill(textParts, cleanText))
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.sort((a, b) => a.start - b.start);
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// Distribute the style fragments within the text parts
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return allParts.map((textPart) => {
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textPart.fragments = styleFragments
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.filter((fragment) => anyIntersection(textPart, fragment))
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.map((fragment) => assign(textPart, fragment));
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return textPart;
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});
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}
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module.exports = merge;
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