canvassed-text/src/parser/to-lines.js

'use strict';

const findAlignment = require("../tags/find-alignment");

module.exports = function componentsToLines(items) {
	let currentLineItems = [];
	let lines = [];
	let lastAlignment = null;

	function closeLine() {
		lines.push(currentLineItems);
		currentLineItems = [];
		lastAlignment = null;
	}

	items.forEach((item) => {
		if (item.type === "newline") {
			closeLine();
		} else {
			let itemAlignment = findAlignment(item);

			if (itemAlignment !== lastAlignment && currentLineItems.length > 0) {
				/* We consider an alignment tag to be a 'block-level' element, therefore if it's
				 * encountered as anything but the first element, it automatically results in a
				 * new line. */
				closeLine();
			}

			currentLineItems.push(item);
			lastAlignment = itemAlignment;
		}
	});

	closeLine();
	return lines;
};