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* Text-level merge helpers.
*
* Generators that write *shared* files — the platform bootstrap that lists test
* groups, the schema registry that orders tables, the Playwright spec that holds
* one `describe` per entity — must extend what is already there rather than
* replace it, or adding an entity silently drops the one added before it.
*
* These helpers are deliberately narrow: each one recognises a single, stable
* shape that a kukum template emits, and returns `undefined` when it does not
* find that shape so the caller can fall back to a plain overwrite and warn
* instead of corrupting the file. They are pure string transforms, so they are
* cheap to unit test and carry no parser dependency.
*/
import type {PrimitiveHost} from './engine.ts';
export const escapeRegExp = (value: string): string => value.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
const unquote = (value: string): string => value.trim().replace(/^['"`]|['"`]$/g, '');
/**
* Append a string to an array literal, e.g.
*
* watch: {test: ['test.widget']} → watch: {test: ['test.widget', 'test.other']}
*
* Used to register a generated test group in the platform's
* `integration.watch.test` list. Idempotent: an existing entry is left as-is.
*/
export function appendStringEntry(
source: string,
property: string,
value: string,
): string | undefined {
const pattern = new RegExp(`(${escapeRegExp(property)}\\s*:\\s*\\[)([\\s\\S]*?)(\\])`);
const match = pattern.exec(source);
if (!match) return undefined;
const [whole, open, body, close] = match;
const entries = body
.split(',')
.map(entry => entry.trim())
.filter(Boolean);
if (entries.map(unquote).includes(value)) return source;
const next = [...entries, `'${value}'`].join(', ');
return `${source.slice(0, match.index)}${open}${next}${close}${source.slice(match.index + whole.length)}`;
}
/**
* Insert an entry into an object literal, e.g.
*
* tables: {'shop.order': 1} → tables: {'shop.order': 1, 'shop.entry': 2}
*
* Used to register a table in `meta/db/db.ts` without dropping the tables other
* entities already registered. Idempotent.
*/
export function insertMapEntry(
source: string,
property: string,
key: string,
value: string | number,
): string | undefined {
const pattern = new RegExp(`(${escapeRegExp(property)}\\s*:\\s*\\{)([\\s\\S]*?)(\\})`);
const match = pattern.exec(source);
if (!match) return undefined;
const [whole, open, body, close] = match;
const entries = body
.split(',')
.map(entry => entry.trim())
.filter(Boolean);
const keys = entries.map(entry => unquote(entry.split(':')[0] ?? ''));
if (keys.includes(key)) return source;
const rendered = typeof value === 'number' ? String(value) : `'${value}'`;
const next = [...entries, `'${key}': ${rendered}`].join(', ');
return `${source.slice(0, match.index)}${open}${next}${close}${source.slice(match.index + whole.length)}`;
}
/** True when `source` already declares a top-level YAML key. */
export function hasYamlKey(source: string, key: string): boolean {
return new RegExp(`^${escapeRegExp(key)}\\s*:`, 'm').test(source);
}
/**
* Append comma-separated values to a YAML scalar, e.g.
*
* e2eManage: e2eWidgetAdd,e2eWidgetFind
* → e2eManage: e2eWidgetAdd,e2eWidgetFind,e2eGadgetAdd,e2eGadgetFind
*
* Used to grant a newly added entity's capabilities to a role. Also matches
* indented keys. Idempotent.
*/
export function appendCommaListValue(
source: string,
key: string,
values: string[],
): string | undefined {
const pattern = new RegExp(`^(\\s*${escapeRegExp(key)}\\s*:\\s*)(\\S.*)$`, 'm');
const match = pattern.exec(source);
if (!match) return undefined;
const [whole, prefix, body] = match;
const existing = body
.split(',')
.map(value => value.trim())
.filter(Boolean);
const missing = values.filter(value => !existing.includes(value));
if (!missing.length) return source;
const next = [...existing, ...missing].join(',');
return `${source.slice(0, match.index)}${prefix}${next}${source.slice(match.index + whole.length)}`;
}
/**
* Read a shared template artifact that is not TypeScript, so it never carries
* the generated marker (YAML seeds, for example).
*/
export function readPlainSource(
host: PrimitiveHost,
root: string,
path: string,
): string | undefined {
const absolute = host.join(root, path);
if (!host.existsSync(absolute)) return undefined;
return String(host.readFileSync(absolute, {encoding: 'utf-8'}));
}
/**
* Append a top-level block to a YAML document, keeping the existing content (and
* its comments) untouched. Idempotent: a document that already declares `key` is
* returned unchanged.
*/
export function appendYamlBlock(source: string, key: string, block: string): string {
if (hasYamlKey(source, key)) return source;
return `${source.replace(/\s*$/, '')}\n${block.replace(/\s*$/, '')}\n`;
}
/** True when a Playwright spec already contains `test.describe('title'`. */
export function hasDescribeBlock(source: string, title: string): boolean {
return new RegExp(`test\\.describe\\(\\s*['"\`]${escapeRegExp(title)}['"\`]`).test(source);
}
/**
* Append a Playwright `test.describe` block to a spec, before the trailing
* newline. Idempotent: an existing block with the same title is left alone.
*/
export function appendDescribeBlock(source: string, title: string, block: string): string {
if (hasDescribeBlock(source, title)) return source;
return `${source.replace(/\s*$/, '')}\n\n${block.replace(/\s*$/, '')}\n`;
}
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