hardlounge/client/js/libs/handlebars/ircmessageparser/merge.js
2018-05-01 14:32:13 +03:00

56 lines
1.9 KiB
JavaScript

"use strict";
const anyIntersection = require("./anyIntersection");
const fill = require("./fill");
// Merge text part information within a styling fragment
function assign(textPart, fragment) {
const fragStart = fragment.start;
const start = Math.max(fragment.start, textPart.start);
const end = Math.min(fragment.end, textPart.end);
const text = fragment.text.slice(start - fragStart, end - fragStart);
return Object.assign({}, fragment, {start, end, text});
}
function sortParts(a, b) {
return a.start - b.start || b.end - a.end;
}
// Merge the style fragments within the text parts, taking into account
// boundaries and text sections that have not matched to links or channels.
// For example, given a string "foobar" where "foo" and "bar" have been
// identified as parts (channels, links, etc.) and "fo", "ob" and "ar" have 3
// different styles, the first resulting part will contain fragments "fo" and
// "o", and the second resulting part will contain "b" and "ar". "o" and "b"
// fragments will contain duplicate styling attributes.
function merge(textParts, styleFragments, cleanText) {
// Every section of the original text that has not been captured in a "part"
// is filled with "text" parts, dummy objects with start/end but no extra
// metadata.
const allParts = textParts
.sort(sortParts) // Sort all parts identified based on their position in the original text
.concat(fill(textParts, cleanText))
.sort(sortParts) // Sort them again after filling in unstyled text
.reduce((prev, curr) => {
const intersection = prev.some((p) => anyIntersection(p, curr));
if (intersection) {
return prev;
}
return prev.concat([curr]);
}, []);
// Distribute the style fragments within the text parts
return allParts.map((textPart) => {
textPart.fragments = styleFragments
.filter((fragment) => anyIntersection(textPart, fragment))
.map((fragment) => assign(textPart, fragment));
return textPart;
});
}
module.exports = merge;