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Pad: Add new `.spliceText()` method 

Co-authored-by: Richard Hansen <rhansen@rhansen.org>
pull/5320/head
Dirk Jagdmann 2021-12-09 20:41:22 -08:00 committed by Richard Hansen
parent 30544b564e
commit 2e4c546c7f
1 changed files with 37 additions and 10 deletions
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47
src/node/db/Pad.js
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@ -251,30 +251,57 @@ Pad.prototype.getKeyRevisionNumber = function (revNum) {
return Math.floor(revNum / 100) * 100; return Math.floor(revNum / 100) * 100;
}; };
/**
* @returns {string} The pad's text.
*/
Pad.prototype.text = function () { Pad.prototype.text = function () {
return this.atext.text; return this.atext.text;
}; };
Pad.prototype.setText = async function (newText) { /**
newText = exports.cleanText(newText); * Splices text into the pad. If the result of the splice does not end with a newline, one will be
if (!newText.endsWith('\n')) newText += '\n'; * automatically appended.
*
* @param {number} start - Location in pad text to start removing and inserting characters. Must be
* a non-negative integer less than or equal to `this.text().length`.
* @param {number} ndel - Number of characters to remove starting at `start`. Must be a non-negative
* integer less than or equal to `this.text().length - start`.
* @param {string} ins - New text to insert at `start` (after the `ndel` characters are deleted).
*/
Pad.prototype.spliceText = async function (start, ndel, ins) {
if (start < 0) throw new RangeError(`start index must be non-negative (is ${start})`);
if (ndel < 0) throw new RangeError(`characters to delete must be non-negative (is ${ndel})`);
const orig = this.text(); const orig = this.text();
if (newText === orig) return; assert(orig.endsWith('\n'));
const changeset = Changeset.makeSplice(orig, 0, orig.length, newText); if (start + ndel > orig.length) throw new RangeError('start/delete past the end of the text');
ins = exports.cleanText(ins);
const willEndWithNewline =
start + ndel < orig.length || // Keeping last char (which is guaranteed to be a newline).
ins.endsWith('\n') ||
(!ins && start > 0 && orig[start - 1] === '\n');
if (!willEndWithNewline) ins += '\n';
if (ndel === 0 && ins.length === 0) return;
const changeset = Changeset.makeSplice(orig, start, ndel, ins);
await this.appendRevision(changeset); await this.appendRevision(changeset);
}; };
/**
* Replaces the pad's text with new text.
*
* @param {string} newText - The pad's new text. If this string does not end with a newline, one
* will be automatically appended.
*/
Pad.prototype.setText = async function (newText) {
await this.spliceText(0, this.text().length, newText);
};
/** /**
* Appends text to the pad. * Appends text to the pad.
* *
* @param {string} newText - Text to insert just BEFORE the pad's existing terminating newline. * @param {string} newText - Text to insert just BEFORE the pad's existing terminating newline.
*/ */
Pad.prototype.appendText = async function (newText) { Pad.prototype.appendText = async function (newText) {
newText = exports.cleanText(newText); await this.spliceText(this.text().length - 1, 0, newText);
const orig = this.text();
assert(orig.endsWith('\n'));
const changeset = Changeset.makeSplice(orig, orig.length - 1, 0, newText);
await this.appendRevision(changeset);
}; };
/** /**