44 lines
1.6 KiB
JavaScript
44 lines
1.6 KiB
JavaScript
// Pure queue logic for the Queued Pastes tool. Kept free of DOM and
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// clipboard APIs so it can be unit tested under Node (see queue.test.mjs).
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// Returns the range of the first line, excluding its trailing newline.
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export function firstLineRange(text) {
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const newline = text.indexOf('\n');
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return { start: 0, end: newline === -1 ? text.length : newline };
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}
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// Returns the first line of text, without its trailing newline.
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export function currentLine(text) {
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const { start, end } = firstLineRange(text);
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return text.slice(start, end);
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}
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// Returns the text with the first line (and its trailing newline) removed.
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export function advance(text) {
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const newline = text.indexOf('\n');
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return newline === -1 ? '' : text.slice(newline + 1);
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}
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// Returns the text to copy for the first line, honoring the
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// include-new-line setting.
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export function copyText(text, includeNewline) {
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const line = currentLine(text);
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return includeNewline ? line + '\n' : line;
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}
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// Returns the clipboard contents adjusted for a toggled include-new-line
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// setting, or null if the clipboard does not currently hold the given line
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// (in which case it must be left untouched).
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export function adjustCopiedLine(clipboardText, line, includeNewline) {
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const stripped = clipboardText.endsWith('\n') ? clipboardText.slice(0, -1) : clipboardText;
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if (stripped !== line) {
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return null;
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}
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return includeNewline ? line + '\n' : line;
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}
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// Removes trailing whitespace (spaces, tabs, newlines) from the end of the
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// text, so enabling the queue does not leave phantom trailing lines.
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export function trimTrailing(text) {
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return text.replace(/\s+$/, '');
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}
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