scroll/src/common/document.ts

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import Row from './row.ts';
import { arrayInsert, maxAdd, minSub } from './fns.ts';
import Option, { None, Some } from './option.ts';
import { getRuntime } from './runtime.ts';
import { Position, SearchDirection } from './types.ts';
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export class Document {
#rows: Row[];
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/**
* Has the document been modified?
*/
public dirty: boolean;
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private constructor() {
this.#rows = [];
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this.dirty = false;
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}
get numRows(): number {
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return this.#rows.length;
}
public static default(): Document {
return new Document();
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}
public isEmpty(): boolean {
return this.#rows.length === 0;
}
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/**
* Open a file for editing
*/
public async open(filename: string): Promise<Document> {
const { file } = await getRuntime();
// Clear any existing rows
if (!this.isEmpty()) {
this.#rows = [];
}
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const rawFile = await file.openFile(filename);
rawFile.split(/\r?\n/)
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.forEach((row) => this.insertRow(this.numRows, row));
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this.dirty = false;
return this;
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}
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/**
* Save the current document
*/
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public async save(filename: string): Promise<void> {
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const { file } = await getRuntime();
await file.saveFile(filename, this.rowsToString());
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this.dirty = false;
}
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public find(
q: string,
at: Position,
direction: SearchDirection = SearchDirection.Forward,
): Option<Position> {
if (at.y >= this.numRows) {
return None;
}
const position = Position.from(at);
const start = (direction === SearchDirection.Forward) ? at.y : 0;
const end = (direction === SearchDirection.Forward)
? this.numRows
: maxAdd(at.y, 1, this.numRows);
for (let y = start; y < end; y++) {
if (this.row(position.y).isNone()) {
return None;
}
const maybeMatch = this.#rows[y].find(q, position.x, direction);
if (maybeMatch.isSome()) {
position.x = maybeMatch.unwrap();
return Some(position);
}
if (direction === SearchDirection.Forward) {
position.y = maxAdd(position.y, 1, this.numRows - 1);
position.x = 0;
} else {
position.y = minSub(position.y, 1, 0);
console.assert(position.y < this.numRows);
position.x = this.#rows[position.y].size - 1;
}
}
return None;
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}
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public insert(at: Position, c: string): void {
if (at.y === this.numRows) {
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this.insertRow(this.numRows, c);
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} else {
this.#rows[at.y].insertChar(at.x, c);
this.#rows[at.y].update(None);
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}
this.dirty = true;
}
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/**
* Insert a new line, splitting and/or creating a new row as needed
*/
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public insertNewline(at: Position): void {
if (at.y > this.numRows) {
return;
}
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// Just add a simple blank line
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if (at.y === this.numRows) {
this.#rows.push(Row.default());
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this.dirty = true;
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return;
}
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// Split the current row, and insert a new
// row with the leftovers
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const newRow = this.#rows[at.y].split(at.x);
newRow.update(None);
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this.#rows = arrayInsert(this.#rows, at.y + 1, newRow);
this.dirty = true;
}
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/**
* Remove a character from the document, merging
* adjacent lines if necessary
*/
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public delete(at: Position): void {
const len = this.numRows;
if (at.y >= len) {
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return;
}
const maybeRow = this.row(at.y);
if (maybeRow.isNone()) {
return;
}
const row = maybeRow.unwrap();
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const mergeNextRow = at.x === row.size && at.y + 1 < len;
const mergeIntoPrevRow = at.x === 0 && at.y > 0;
// If we are at the end of a line, and press delete,
// add the contents of the next row, and delete
// the merged row object
if (mergeNextRow) {
// At the end of a line, pressing delete will merge
// the next line into the current on
const rowToAppend = this.#rows.at(at.y + 1)!.toString();
row.append(rowToAppend);
this.deleteRow(at.y + 1);
} else if (mergeIntoPrevRow) {
// At the beginning of a line, merge the current line
// into the previous Row
const rowToAppend = row.toString();
this.#rows[at.y - 1].append(rowToAppend);
this.deleteRow(at.y);
} else {
row.delete(at.x);
}
row.update(None);
this.dirty = true;
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}
public row(i: number): Option<Row> {
if (i >= this.numRows) {
return None;
}
return Option.from(this.#rows[i]);
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}
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public insertRow(at: number = this.numRows, s: string = ''): void {
this.#rows = arrayInsert(this.#rows, at, Row.from(s));
this.#rows[at].update(None);
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this.dirty = true;
}
public highlight(searchMatch: Option<string>): void {
this.#rows.forEach((row) => {
row.update(searchMatch);
});
}
/**
* Delete the specified row
* @param at - the index of the row to delete
* @private
*/
private deleteRow(at: number): void {
this.#rows.splice(at, 1);
}
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/**
* Convert the array of row objects into one string
* @private
*/
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private rowsToString(): string {
return this.#rows.map((r) => r.toString()).join('\n');
}
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}
export default Document;