80 lines
3.2 KiB
JavaScript
80 lines
3.2 KiB
JavaScript
// #167: with line wrapping on, a logical line can occupy several visual
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// lines; the gutter must show one number per VISUAL line. Per-line spans
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// give each logical line its own box so its height identifies the wrapped
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// row count; blank gutter rows keep numbers aligned with line starts.
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(function () {
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var body = document.getElementById('codebody');
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var gutter = document.getElementById('gutter');
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var code = document.getElementById('code');
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if (!body || !gutter || !code) return;
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var wrapOn = function () {
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return document.documentElement.hasAttribute('data-wrap');
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};
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// Wrap each logical line (split on newline; spans never contain newlines
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// because HighlightCode highlights per line) in a .codeline block. The
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// blocks must be adjacent with NO newline text between them (#194):
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// .codeline is display:block, and under pre-wrap each interleaved '\n'
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// text node renders as an extra phantom row in the code column that
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// renumber() does not count, drifting the gutter off alignment on
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// wrapped lines. Blank lines become empty blocks; .codeline:empty keeps
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// them one row tall (see app.css).
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function splitLines() {
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var html = body.innerHTML;
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var parts = html.split('\n');
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var out = [];
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for (var i = 0; i < parts.length; i++) {
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out.push('<span class="codeline">' + parts[i] + '</span>');
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}
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body.innerHTML = out.join('');
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}
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function renumber() {
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var lines = body.querySelectorAll('.codeline');
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var s = '';
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if (wrapOn() && lines.length) {
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// Each logical line block occupies rows = height / line-height when
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// wrapped; its number sits on the first row and the remaining rows get
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// blank gutter lines so numbers stay aligned with line starts.
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// The gutter has a fixed CSS width now (.code .gutter), so its row
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// count never changes the code column width: measurement is stable
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// with no measurement/layout feedback.
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var lh = parseFloat(getComputedStyle(body).lineHeight) || 1;
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gutter.textContent = '';
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var frag = document.createDocumentFragment();
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for (var i = 0; i < lines.length; i++) {
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var num = document.createElement('span');
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num.className = 'gutline';
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num.textContent = String(i + 1);
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frag.appendChild(num);
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var rows = Math.max(1, Math.round(lines[i].getBoundingClientRect().height / lh));
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for (var r = 1; r < rows; r++) {
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var blank = document.createElement('span');
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blank.className = 'gutline';
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blank.textContent = '\u00a0';
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frag.appendChild(blank);
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}
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}
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gutter.appendChild(frag);
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} else {
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for (var k = 1; k <= lines.length; k++) s += k + '\n';
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gutter.textContent = lines.length ? s.slice(0, -1) : '1';
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}
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}
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splitLines();
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renumber();
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// Re-renumber on toggle (theme.js toggles data-wrap on <html>) and on any
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// size change (paste of lots of text, window resize, zoom).
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var mo = new MutationObserver(renumber);
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mo.observe(document.documentElement, { attributes: true, attributeFilter: ['data-wrap'] });
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if (window.ResizeObserver) {
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var ro = new ResizeObserver(function () { renumber(); });
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ro.observe(body);
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} else {
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window.addEventListener('resize', renumber);
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}
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})();
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