470 lines
15 KiB
JavaScript
470 lines
15 KiB
JavaScript
import EasySAXParser from './easysax';
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import {sleep} from '../../../share/utils';
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export default class BookParser {
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constructor() {
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// defaults
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this.p = 30;// px, отступ параграфа
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this.w = 300;// px, ширина страницы
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this.wordWrap = false;// перенос по слогам
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// заглушка
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this.measureText = (text, style) => {// eslint-disable-line no-unused-vars
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return text.length*10;
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};
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}
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async parse(data, callback) {
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if (!callback)
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callback = () => {};
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callback(0);
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this.data = data;
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if (data.indexOf('<FictionBook') < 0) {
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throw new Error('Неверный формат файла');
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}
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//defaults
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let fb2 = {
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firstName: '',
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middleName: '',
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lastName: '',
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bookTitle: '',
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};
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let path = '';
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let tag = '';
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let nextPerc = 0;
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let paraIndex = -1;
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let paraOffset = 0;
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let para = []; /*array of
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{
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index: Number,
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offset: Number, //сумма всех length до этого параграфа
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length: Number, //длина text без тегов
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text: String //текст параграфа (или title или epigraph и т.д) с вложенными тегами
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}
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*/
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const newParagraph = (text, len) => {
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paraIndex++;
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let p = {
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index: paraIndex,
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offset: paraOffset,
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length: len,
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text: text
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};
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para[paraIndex] = p;
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paraOffset += p.length;
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};
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const growParagraph = (text, len) => {
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let p = para[paraIndex];
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if (p) {
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paraOffset -= p.length;
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if (p.text == ' ') {
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p.length = 0;
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p.text = '';
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}
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p.length += len;
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p.text += text;
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} else {
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p = {
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index: paraIndex,
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offset: paraOffset,
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length: len,
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text: text
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};
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}
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para[paraIndex] = p;
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paraOffset += p.length;
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};
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const parser = new EasySAXParser();
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parser.on('error', (msgError) => {// eslint-disable-line no-unused-vars
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});
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parser.on('startNode', (elemName, getAttr, isTagEnd, getStrNode) => {// eslint-disable-line no-unused-vars
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tag = elemName;
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path += '/' + elemName;
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if ((tag == 'p' || tag == 'empty-line') && path.indexOf('/FictionBook/body/section') == 0) {
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newParagraph(' ', 1);
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}
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});
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parser.on('endNode', (elemName, isTagStart, getStrNode) => {// eslint-disable-line no-unused-vars
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if (tag == elemName) {
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path = path.substr(0, path.length - tag.length - 1);
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let i = path.lastIndexOf('/');
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if (i >= 0) {
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tag = path.substr(i + 1);
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} else {
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tag = path;
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}
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}
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});
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parser.on('textNode', (text) => {
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if (text != ' ' && text.trim() == '')
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text = text.trim();
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if (text == '')
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return;
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switch (path) {
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case '/FictionBook/description/title-info/author/first-name':
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fb2.firstName = text;
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break;
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case '/FictionBook/description/title-info/author/middle-name':
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fb2.middleName = text;
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break;
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case '/FictionBook/description/title-info/author/last-name':
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fb2.lastName = text;
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break;
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case '/FictionBook/description/title-info/genre':
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fb2.genre = text;
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break;
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case '/FictionBook/description/title-info/date':
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fb2.date = text;
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break;
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case '/FictionBook/description/title-info/book-title':
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fb2.bookTitle = text;
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break;
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case '/FictionBook/description/title-info/id':
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fb2.id = text;
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break;
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}
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if (path.indexOf('/FictionBook/description/title-info/annotation') == 0) {
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if (!fb2.annotation)
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fb2.annotation = '';
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if (tag != 'annotation')
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fb2.annotation += `<${tag}>${text}</${tag}>`;
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else
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fb2.annotation += text;
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}
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if (path.indexOf('/FictionBook/body/title') == 0) {
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newParagraph(text, text.length);
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}
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if (path.indexOf('/FictionBook/body/section') == 0) {
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switch (tag) {
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case 'p':
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growParagraph(text, text.length);
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break;
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case 'section':
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case 'title':
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newParagraph(text, text.length);
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break;
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default:
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growParagraph(`<${tag}>${text}</${tag}>`, text.length);
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}
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}
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});
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parser.on('cdata', (data) => {// eslint-disable-line no-unused-vars
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});
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parser.on('comment', (text) => {// eslint-disable-line no-unused-vars
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});
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parser.on('progress', async(progress) => {
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if (progress > nextPerc) {
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await sleep(1);
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callback(progress);
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nextPerc += 10;
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}
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});
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await parser.parse(data);
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this.fb2 = fb2;
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this.para = para;
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callback(100);
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await sleep(10);
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return {fb2};
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}
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findParaIndex(bookPos) {
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let result = undefined;
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//дихотомия
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let first = 0;
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let last = this.para.length - 1;
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while (first < last) {
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let mid = first + Math.floor((last - first)/2);
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if (bookPos <= this.para[mid].offset + this.para[mid].length - 1)
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last = mid;
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else
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first = mid + 1;
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}
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if (last >= 0) {
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const ofs = this.para[last].offset;
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if (bookPos >= ofs && bookPos < ofs + this.para[last].length)
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result = last;
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}
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return result;
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}
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removeTags(s) {
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let result = '';
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const parser = new EasySAXParser();
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parser.on('textNode', (text) => {
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result += text;
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});
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parser.parse(`<p>${s}</p>`);
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return result;
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}
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splitToSlogi(word) {
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let result = [];
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const glas = new Set(['а', 'А', 'о', 'О', 'и', 'И', 'е', 'Е', 'ё', 'Ё', 'э', 'Э', 'ы', 'Ы', 'у', 'У', 'ю', 'Ю', 'я', 'Я']);
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const soglas = new Set([
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'б', 'в', 'г', 'д', 'ж', 'з', 'й', 'к', 'л', 'м', 'н', 'п', 'р', 'с', 'т', 'ф', 'х', 'ц', 'ч', 'ш', 'щ',
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'Б', 'В', 'Г', 'Д', 'Ж', 'З', 'Й', 'К', 'Л', 'М', 'Н', 'П', 'Р', 'С', 'Т', 'Ф', 'Х', 'Ч', 'Ц', 'Ш', 'Щ'
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]);
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const znak = new Set(['ь', 'Ь', 'ъ', 'Ъ', 'й', 'Й']);
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const alpha = new Set([...glas, ...soglas, ...znak]);
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let slog = '';
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let slogLen = 0;
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const len = word.length;
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word += ' ';
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for (let i = 0; i < len; i++) {
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slog += word[i];
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if (alpha.has(word[i]))
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slogLen++;
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if (slogLen > 1 && i < len - 2 && (
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//гласная, а следом не 2 согласные буквы
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(glas.has(word[i]) && !(soglas.has(word[i + 1]) &&
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soglas.has(word[i + 2])) && alpha.has(word[i + 1]) && alpha.has(word[i + 2])
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) ||
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//предыдущая не согласная буква, текущая согласная, а следом согласная и согласная|гласная буквы
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(alpha.has(word[i - 1]) && !soglas.has(word[i - 1]) &&
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soglas.has(word[i]) && soglas.has(word[i + 1]) &&
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(glas.has(word[i + 2]) || soglas.has(word[i + 2])) &&
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alpha.has(word[i + 1]) && alpha.has(word[i + 2])
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) ||
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//мягкий или твердый знак или Й
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(znak.has(word[i]) && alpha.has(word[i + 1]) && alpha.has(word[i + 2])) ||
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(word[i] == '-')
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) &&
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//нельзя оставлять окончания на ь, ъ, й
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!(znak.has(word[i + 2]) && !alpha.has(word[i + 3]))
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) {
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result.push(slog);
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slog = '';
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slogLen = 0;
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}
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}
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if (slog)
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result.push(slog);
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return result;
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}
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parsePara(paraIndex) {
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const para = this.para[paraIndex];
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if (para.parsed &&
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para.parsed.w === this.w &&
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para.parsed.p === this.p &&
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para.parsed.wordWrap === this.wordWrap &&
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para.parsed.font === this.font
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)
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return para.parsed;
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const parsed = {
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w: this.w,
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p: this.p,
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wordWrap: this.wordWrap,
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font: this.font,
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};
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const lines = []; /* array of
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{
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begin: Number,
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end: Number,
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first: Boolean,
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last: Boolean,
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parts: array of {
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style: 'bold'|'italic',
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text: String,
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}
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}*/
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const text = this.removeTags(para.text);
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const words = text.split(' ');
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let line = {begin: para.offset, parts: []};
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let prevPart = '';
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let part = '';
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let prevW = 0;
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let j = 0;
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// тут начинается самый замес, перенос и стилизация
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for (let i = 0; i < words.length; i++) {
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const word = words[i];
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part += word;
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let p = (j == 0 ? parsed.p : 0);
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let w = this.measureText(part) + p;
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if (w > parsed.w) {
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let wordTail;
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if (parsed.wordWrap) {
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let slogi = this.splitToSlogi(word);
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if (slogi.length > 1) {
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let s = prevPart + ' ';
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let pw;
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const slogiLen = slogi.length;
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for (let k = 0; k < slogiLen - 1; k++) {
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let slog = slogi[0];
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if (slog[slog.length - 1] == '-') //убрать '-' в конце слога, добавим свой
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slog = slog.substr(0, slog.length - 1);
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let ww = this.measureText(s + slog + '-') + p;
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if (ww <= parsed.w) {
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s += slog;
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} else
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break;
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pw = ww;
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slogi.shift();
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}
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if (pw) {
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prevW = pw;
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prevPart = s + '-';
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wordTail = slogi.join('');
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} else {
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wordTail = word;
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}
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} else {
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wordTail = word;
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}
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} else {
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wordTail = word;
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}
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line.parts.push({style: '', text: prevPart});
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line.end = line.begin + prevPart.length - (wordTail != word ? 2 : 0);//это как, ы ? 2 и 0
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line.width = prevW;
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line.first = (j == 0);
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line.last = false;
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lines.push(line);
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line = {begin: line.end + 1, parts: []};
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part = wordTail;
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j++;
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}
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prevW = w;
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prevPart = part;
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part += ' ';
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}
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line.parts.push({style: '', text: prevPart});
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line.end = line.begin + prevPart.length - 1;
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line.width = prevW;
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line.first = (j == 0);
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line.last = true;
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lines.push(line);
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parsed.lines = lines;
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para.parsed = parsed;
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return parsed;
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}
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findLineIndex(bookPos, lines) {
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let result = undefined;
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//дихотомия
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let first = 0;
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let last = lines.length - 1;
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while (first < last) {
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let mid = first + Math.floor((last - first)/2);
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if (bookPos <= lines[mid].end)
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last = mid;
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else
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first = mid + 1;
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}
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if (last >= 0) {
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if (bookPos >= lines[last].begin && bookPos <= lines[last].end)
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result = last;
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}
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return result;
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}
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getLines(bookPos, n) {
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const result = [];
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let paraIndex = this.findParaIndex(bookPos);
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if (paraIndex === undefined)
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return result;
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if (n > 0) {
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let parsed = this.parsePara(paraIndex);
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let i = this.findLineIndex(bookPos, parsed.lines);
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if (i === undefined)
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return result;
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while (n > 0) {
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result.push(parsed.lines[i]);
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i++;
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if (i >= parsed.lines.length) {
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paraIndex++;
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if (paraIndex < this.para.length)
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parsed = this.parsePara(paraIndex);
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else
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return result;
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i = 0;
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}
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n--;
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}
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} else if (n < 0) {
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n = -n;
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let parsed = this.parsePara(paraIndex);
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let i = this.findLineIndex(bookPos, parsed.lines);
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if (i === undefined)
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return result;
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while (n > 0) {
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result.push(parsed.lines[i]);
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i--;
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if (i < 0) {
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paraIndex--;
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if (paraIndex >= 0)
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parsed = this.parsePara(paraIndex);
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else
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return result;
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i = parsed.lines.length - 1;
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}
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n--;
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}
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}
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return result;
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}
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} |