mirror of https://github.com/status-im/codimd.git
379 lines
12 KiB
JavaScript
379 lines
12 KiB
JavaScript
// Inject line numbers for sync scroll.
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var extra = require('./extra');
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var md = extra.md;
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function addPart(tokens, idx) {
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if (tokens[idx].map && tokens[idx].level === 0) {
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var startline = tokens[idx].map[0] + 1;
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var endline = tokens[idx].map[1];
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tokens[idx].attrJoin('class', 'part');
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tokens[idx].attrJoin('data-startline', startline);
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tokens[idx].attrJoin('data-endline', endline);
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}
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}
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md.renderer.rules.blockquote_open = function (tokens, idx, options, env, self) {
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tokens[idx].attrJoin('class', 'raw');
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addPart(tokens, idx);
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return self.renderToken.apply(self, arguments);
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};
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md.renderer.rules.table_open = function (tokens, idx, options, env, self) {
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addPart(tokens, idx);
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return self.renderToken.apply(self, arguments);
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};
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md.renderer.rules.bullet_list_open = function (tokens, idx, options, env, self) {
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addPart(tokens, idx);
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return self.renderToken.apply(self, arguments);
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};
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md.renderer.rules.list_item_open = function (tokens, idx, options, env, self) {
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tokens[idx].attrJoin('class', 'raw');
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if (tokens[idx].map) {
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var startline = tokens[idx].map[0] + 1;
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var endline = tokens[idx].map[1];
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tokens[idx].attrJoin('data-startline', startline);
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tokens[idx].attrJoin('data-endline', endline);
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}
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return self.renderToken.apply(self, arguments);
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};
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md.renderer.rules.ordered_list_open = function (tokens, idx, options, env, self) {
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addPart(tokens, idx);
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return self.renderToken.apply(self, arguments);
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};
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md.renderer.rules.link_open = function (tokens, idx, options, env, self) {
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addPart(tokens, idx);
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return self.renderToken.apply(self, arguments);
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};
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md.renderer.rules.paragraph_open = function (tokens, idx, options, env, self) {
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addPart(tokens, idx);
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return self.renderToken.apply(self, arguments);
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};
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md.renderer.rules.heading_open = function (tokens, idx, options, env, self) {
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tokens[idx].attrJoin('class', 'raw');
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addPart(tokens, idx);
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return self.renderToken.apply(self, arguments);
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};
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md.renderer.rules.fence = function (tokens, idx, options, env, self) {
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var token = tokens[idx],
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info = token.info ? md.utils.unescapeAll(token.info).trim() : '',
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langName = '',
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highlighted;
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if (info) {
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langName = info.split(/\s+/g)[0];
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if (/\!$/.test(info)) token.attrJoin('class', 'wrap');
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token.attrJoin('class', options.langPrefix + langName.replace(/\=$|\=\d+$|\=\+$|\!$|\=\!/, ''));
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token.attrJoin('class', 'hljs');
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token.attrJoin('class', 'raw');
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}
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if (options.highlight) {
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highlighted = options.highlight(token.content, langName) || md.utils.escapeHtml(token.content);
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} else {
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highlighted = md.utils.escapeHtml(token.content);
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}
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if (highlighted.indexOf('<pre') === 0) {
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return highlighted + '\n';
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}
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if (tokens[idx].map && tokens[idx].level === 0) {
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var startline = tokens[idx].map[0] + 1;
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var endline = tokens[idx].map[1];
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return '<pre class="part" data-startline="' + startline + '" data-endline="' + endline + '"><code' + self.renderAttrs(token) + '>'
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+ highlighted
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+ '</code></pre>\n';
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}
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return '<pre><code' + self.renderAttrs(token) + '>'
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+ highlighted
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+ '</code></pre>\n';
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};
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md.renderer.rules.code_block = function (tokens, idx, options, env, self) {
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if (tokens[idx].map && tokens[idx].level === 0) {
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var startline = tokens[idx].map[0] + 1;
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var endline = tokens[idx].map[1];
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return '<pre class="part" data-startline="' + startline + '" data-endline="' + endline + '"><code>' + md.utils.escapeHtml(tokens[idx].content) + '</code></pre>\n';
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}
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return '<pre><code>' + md.utils.escapeHtml(tokens[idx].content) + '</code></pre>\n';
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};
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function renderContainer(tokens, idx, options, env, self) {
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tokens[idx].attrJoin('role', 'alert');
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tokens[idx].attrJoin('class', 'alert');
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tokens[idx].attrJoin('class', 'alert-' + tokens[idx].info.trim());
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addPart(tokens, idx);
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return self.renderToken.apply(self, arguments);
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}
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var markdownitContainer = require('markdown-it-container');
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md.use(markdownitContainer, 'success', { render: renderContainer });
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md.use(markdownitContainer, 'info', { render: renderContainer });
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md.use(markdownitContainer, 'warning', { render: renderContainer });
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md.use(markdownitContainer, 'danger', { render: renderContainer });
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// FIXME: expose syncscroll to window
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window.syncscroll = true;
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window.preventSyncScrollToEdit = false;
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window.preventSyncScrollToView = false;
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var editScrollThrottle = 5;
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var viewScrollThrottle = 5;
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var buildMapThrottle = 100;
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var viewScrolling = false;
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var editScrolling = false;
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var editArea = null;
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var viewArea = null;
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var markdownArea = null;
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function setupSyncAreas(edit, view, markdown) {
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editArea = edit;
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viewArea = view;
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markdownArea = markdown;
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editArea.on('scroll', _.throttle(syncScrollToView, editScrollThrottle));
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viewArea.on('scroll', _.throttle(syncScrollToEdit, viewScrollThrottle));
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}
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var scrollMap, lineHeightMap, viewTop, viewBottom;
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window.viewAjaxCallback = clearMap;
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function clearMap() {
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scrollMap = null;
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lineHeightMap = null;
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viewTop = null;
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viewBottom = null;
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}
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var buildMap = _.throttle(buildMapInner, buildMapThrottle);
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// Build offsets for each line (lines can be wrapped)
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// That's a bit dirty to process each line everytime, but ok for demo.
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// Optimizations are required only for big texts.
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function buildMapInner(callback) {
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if (!viewArea || !markdownArea) return;
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var i, offset, nonEmptyList, pos, a, b, _lineHeightMap, linesCount,
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acc, _scrollMap;
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offset = viewArea.scrollTop() - viewArea.offset().top;
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_scrollMap = [];
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nonEmptyList = [];
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_lineHeightMap = [];
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viewTop = 0;
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viewBottom = viewArea[0].scrollHeight - viewArea.height();
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acc = 0;
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var lines = editor.getValue().split('\n');
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var lineHeight = editor.defaultTextHeight();
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for (i = 0; i < lines.length; i++) {
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var str = lines[i];
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_lineHeightMap.push(acc);
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if (str.length === 0) {
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acc++;
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continue;
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}
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var h = editor.heightAtLine(i + 1) - editor.heightAtLine(i);
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acc += Math.round(h / lineHeight);
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}
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_lineHeightMap.push(acc);
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linesCount = acc;
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for (i = 0; i < linesCount; i++) {
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_scrollMap.push(-1);
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}
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nonEmptyList.push(0);
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// make the first line go top
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_scrollMap[0] = viewTop;
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var parts = markdownArea.find('.part').toArray();
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for (i = 0; i < parts.length; i++) {
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var $el = $(parts[i]),
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t = $el.attr('data-startline') - 1;
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if (t === '') {
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return;
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}
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t = _lineHeightMap[t];
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if (t !== 0 && t !== nonEmptyList[nonEmptyList.length - 1]) {
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nonEmptyList.push(t);
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}
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_scrollMap[t] = Math.round($el.offset().top + offset - 10);
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}
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nonEmptyList.push(linesCount);
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_scrollMap[linesCount] = viewArea[0].scrollHeight;
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pos = 0;
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for (i = 1; i < linesCount; i++) {
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if (_scrollMap[i] !== -1) {
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pos++;
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continue;
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}
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a = nonEmptyList[pos];
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b = nonEmptyList[pos + 1];
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_scrollMap[i] = Math.round((_scrollMap[b] * (i - a) + _scrollMap[a] * (b - i)) / (b - a));
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}
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_scrollMap[0] = 0;
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scrollMap = _scrollMap;
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lineHeightMap = _lineHeightMap;
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if (loaded && callback) callback();
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}
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// sync view scroll progress to edit
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var viewScrollingTimer = null;
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function syncScrollToEdit(event, preventAnimate) {
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if (currentMode != modeType.both || !syncscroll || !editArea) return;
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if (preventSyncScrollToEdit) {
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if (typeof preventSyncScrollToEdit === 'number') {
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preventSyncScrollToEdit--;
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} else {
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preventSyncScrollToEdit = false;
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}
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return;
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}
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if (!scrollMap || !lineHeightMap) {
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buildMap(function () {
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syncScrollToEdit(event, preventAnimate);
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});
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return;
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}
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if (editScrolling) return;
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var scrollTop = viewArea[0].scrollTop;
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var lineIndex = 0;
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for (var i = 0, l = scrollMap.length; i < l; i++) {
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if (scrollMap[i] > scrollTop) {
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break;
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} else {
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lineIndex = i;
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}
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}
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var lineNo = 0;
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var lineDiff = 0;
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for (var i = 0, l = lineHeightMap.length; i < l; i++) {
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if (lineHeightMap[i] > lineIndex) {
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break;
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} else {
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lineNo = lineHeightMap[i];
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lineDiff = lineHeightMap[i + 1] - lineNo;
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}
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}
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var posTo = 0;
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var topDiffPercent = 0;
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var posToNextDiff = 0;
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var scrollInfo = editor.getScrollInfo();
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var textHeight = editor.defaultTextHeight();
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var preLastLineHeight = scrollInfo.height - scrollInfo.clientHeight - textHeight;
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var preLastLineNo = Math.round(preLastLineHeight / textHeight);
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var preLastLinePos = scrollMap[preLastLineNo];
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if (scrollInfo.height > scrollInfo.clientHeight && scrollTop >= preLastLinePos) {
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posTo = preLastLineHeight;
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topDiffPercent = (scrollTop - preLastLinePos) / (viewBottom - preLastLinePos);
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posToNextDiff = textHeight * topDiffPercent;
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posTo += Math.ceil(posToNextDiff);
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} else {
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posTo = lineNo * textHeight;
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topDiffPercent = (scrollTop - scrollMap[lineNo]) / (scrollMap[lineNo + lineDiff] - scrollMap[lineNo]);
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posToNextDiff = textHeight * lineDiff * topDiffPercent;
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posTo += Math.ceil(posToNextDiff);
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}
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if (preventAnimate) {
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editArea.scrollTop(posTo);
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} else {
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var posDiff = Math.abs(scrollInfo.top - posTo);
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var duration = posDiff / 50;
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duration = duration >= 100 ? duration : 100;
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editArea.stop(true, true).animate({
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scrollTop: posTo
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}, duration, "linear");
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}
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viewScrolling = true;
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clearTimeout(viewScrollingTimer);
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viewScrollingTimer = setTimeout(viewScrollingTimeoutInner, duration * 1.5);
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}
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function viewScrollingTimeoutInner() {
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viewScrolling = false;
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}
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// sync edit scroll progress to view
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var editScrollingTimer = null;
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function syncScrollToView(event, preventAnimate) {
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if (currentMode != modeType.both || !syncscroll || !viewArea) return;
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if (preventSyncScrollToView) {
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if (typeof preventSyncScrollToView === 'number') {
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preventSyncScrollToView--;
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} else {
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preventSyncScrollToView = false;
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}
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return;
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}
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if (!scrollMap || !lineHeightMap) {
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buildMap(function () {
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syncScrollToView(event, preventAnimate);
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});
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return;
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}
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if (viewScrolling) return;
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var lineNo, posTo;
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var topDiffPercent, posToNextDiff;
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var scrollInfo = editor.getScrollInfo();
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var textHeight = editor.defaultTextHeight();
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lineNo = Math.floor(scrollInfo.top / textHeight);
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// if reach the last line, will start lerp to the bottom
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var diffToBottom = (scrollInfo.top + scrollInfo.clientHeight) - (scrollInfo.height - textHeight);
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if (scrollInfo.height > scrollInfo.clientHeight && diffToBottom > 0) {
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topDiffPercent = diffToBottom / textHeight;
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posTo = scrollMap[lineNo + 1];
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posToNextDiff = (viewBottom - posTo) * topDiffPercent;
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posTo += Math.floor(posToNextDiff);
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} else {
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topDiffPercent = (scrollInfo.top % textHeight) / textHeight;
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posTo = scrollMap[lineNo];
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posToNextDiff = (scrollMap[lineNo + 1] - posTo) * topDiffPercent;
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posTo += Math.floor(posToNextDiff);
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}
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if (preventAnimate) {
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viewArea.scrollTop(posTo);
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} else {
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var posDiff = Math.abs(viewArea.scrollTop() - posTo);
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var duration = posDiff / 50;
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duration = duration >= 100 ? duration : 100;
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viewArea.stop(true, true).animate({
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scrollTop: posTo
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}, duration, "linear");
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}
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editScrolling = true;
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clearTimeout(editScrollingTimer);
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editScrollingTimer = setTimeout(editScrollingTimeoutInner, duration * 1.5);
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}
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function editScrollingTimeoutInner() {
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editScrolling = false;
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}
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module.exports = {
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setupSyncAreas: setupSyncAreas,
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clearMap: clearMap,
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syncScrollToEdit: syncScrollToEdit,
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syncScrollToView: syncScrollToView
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};
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