feat(bgm): add board game manifest loader

Parse yaml/json/toml and markdown code blocks into packages, expanding
$variants via typed-csv and collecting parts, surfaces, and setups by
include patterns. Ships zod validation, a vitest config, and 16 tests.
This commit is contained in:
2026-08-09 18:59:14 +08:00
parent 1cfec40c99
commit c0967ab71f
14 changed files with 1242 additions and 0 deletions
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{
"name": "@tts/bgm",
"version": "0.0.0",
"private": true,
"type": "module",
"main": "./dist/index.js",
"types": "./dist/index.d.ts",
"exports": {
".": {
"types": "./dist/index.d.ts",
"import": "./dist/index.js"
}
},
"scripts": {
"build": "tsc -p tsconfig.json",
"typecheck": "tsc -p tsconfig.json --noEmit",
"test": "vitest run",
"lint": "echo \"no lint configured\""
},
"dependencies": {
"marked": "^16.0.0",
"picomatch": "^4.0.5",
"smol-toml": "^1.4.0",
"typed-csv": "^2.0.0",
"yaml": "^2.4.2",
"zod": "^3.24.1"
},
"devDependencies": {
"@types/node": "^22.12.0",
"@types/picomatch": "^4.0.0",
"typescript": "^5.7.2",
"vitest": "^4.1.10"
}
}
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# Harbor
A tiny example game used to exercise the bgm loader.
```yaml file=harbor.yaml
role: package
id: harbor
title: Harbor
designer: Jane Doe
players: 2
language: en
```
## Tokens
```yaml file=parts/tokens.yaml
role: part
type: token
id: wood
face: ./assets/tokens.png
faceCrop: [1, 0, 5, 2]
back: ./assets/tokens.png
backCrop: [3, 0, 5, 2]
shape: ./assets/token-shape.png
size: [20, 20, 3]
fillet: 2
```
```yaml file=parts/tokens.yaml
role: part
type: token
id: grain
face: ./assets/tokens.png
faceCrop: [0, 0, 5, 2]
back: ./assets/tokens.png
backCrop: [2, 0, 5, 2]
shape: ./assets/token-shape.png
size: [20, 20, 3]
fillet: 2
```
## Board
```yaml file=parts/board.yaml
type: board
id: harbor
role: surface
size: [300, 200]
layout:
- route: /dock/:seat
candidates:
$variants: ./seats.csv
- route: /deck
x: -100
y: 0
rotation: 0
```
```csv file=parts/seats.csv
seat,x,y,rotation
string,number,number,number
0,40,0,0
1,40,20,0
```
## Setup
```yaml file=setup/main.yaml
role: setup
type: game
id: main
setup:
/dock/0: harbor:token#wood
/deck: harbor:token#grain
```
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import { describe, expect, it } from 'vitest';
import * as path from 'node:path';
import { fileURLToPath } from 'node:url';
import { loadDefs, collectPackages } from './collect.js';
const fixtureRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '__fixtures__');
describe('collectPackages', () => {
it('collects the harbor package from markdown code blocks', () => {
const defMap = loadDefs('', fixtureRoot);
const packages = collectPackages(defMap, fixtureRoot);
expect(packages).toHaveLength(1);
const harbor = packages[0]!;
expect(harbor.meta).toMatchObject({ id: 'harbor', title: 'Harbor', designer: 'Jane Doe' });
// Two tokens from two yaml blocks sharing a `file=` name.
expect([...harbor.parts.keys()].sort()).toEqual(['token#grain', 'token#wood']);
const wood = harbor.parts.get('token#wood')!;
expect(wood).toMatchObject({
type: 'token',
id: 'wood',
size: [20, 20, 3],
fillet: 2,
});
expect(wood.face).toBe('./assets/tokens.png');
expect(wood.faceCrop).toEqual([1, 0, 5, 2]);
// One surface with a $variants-expanded candidates list.
expect([...harbor.surfaces.keys()]).toEqual(['board#harbor']);
const board = harbor.surfaces.get('board#harbor')!;
expect(board.size).toEqual([300, 200]);
expect(board.layout).toHaveLength(2);
const dock = board.layout[0]!;
expect(dock.route).toBe('/dock/:seat');
expect(dock.candidates).toEqual([
{ seat: '0', x: 40, y: 0, rotation: 0 },
{ seat: '1', x: 40, y: 20, rotation: 0 },
]);
const deck = board.layout[1]!;
expect(deck.route).toBe('/deck');
expect(deck).toMatchObject({ x: -100, y: 0, rotation: 0 });
// One setup.
expect([...harbor.setups.keys()]).toEqual(['game#main']);
const setup = harbor.setups.get('game#main')!;
expect(setup.setup).toEqual({
'/dock/0': 'harbor:token#wood',
'/deck': 'harbor:token#grain',
});
});
it('throws on a duplicate type#id', () => {
const defMap = loadDefs('', fixtureRoot);
// Inject a duplicate part into the map under a new file name.
const tokensKey = [...defMap.defs.keys()].find((k) => k.endsWith('parts/tokens.yaml'))!;
const tokens = defMap.defs.get(tokensKey)!;
defMap.defs.set(tokensKey.replace('tokens.yaml', 'dup.yaml'), [tokens[0]!]);
expect(() => collectPackages(defMap, fixtureRoot)).toThrow(/Duplicate part/);
});
});
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/**
* Collect packages from a games root directory.
*
* A games root contains yaml/json/toml files and markdown files with
* definition code blocks. The loader:
*
* 1. Reads real files and extracts virtual files from markdown code blocks
* (virtual wins over real files with the same name).
* 2. Parses each def file into JSON objects.
* 3. Recognizes `role: package` objects, expands their `$variants`, follows
* their `include` patterns, and assembles the package's parts, surfaces,
* and setups.
*
* See docs/bgm-format.md for the format's concrete behavior.
*/
import picomatch from 'picomatch';
import { collectVirtualFiles } from './markdown.js';
import { parseDefText, readDefFiles } from './parse.js';
import { validatePackage, validatePart, validateSetup, validateSurface } from './schemas.js';
import { expandVariants } from './variants.js';
import {
BgmError,
type DefFile,
type ParsedDef,
type Package,
type PackageDef,
type Part,
type Role,
type Setup,
type Surface,
} from './types.js';
const ROLES = new Set<Role>(['package', 'part', 'surface', 'setup']);
/** Every definition parsed from a def file, keyed by its path-style name. */
export interface DefMap {
/** All def files (real + virtual), keyed by name. */
files: Map<string, DefFile[]>;
/** All parsed definitions, keyed by file name. */
defs: Map<string, ParsedDef[]>;
}
/**
* Load a games root into a def map.
*
* @param root the path-style name of the root, e.g. `harbor`
* @param rootDir the absolute path of the games root
*/
export function loadDefs(root: string, rootDir: string): DefMap {
const realFiles = readDefFiles(rootDir, root);
const markdownFiles = new Map<string, string>();
const others: DefFile[] = [];
for (const file of realFiles) {
if (file.kind === 'markdown') markdownFiles.set(file.name, file.text);
else others.push(file);
}
const virtualFiles = collectVirtualFiles(markdownFiles);
const files = new Map<string, DefFile[]>();
// Real files first, virtual files override (virtual wins per the format).
for (const file of others) files.set(file.name, [file]);
for (const [name, list] of virtualFiles) files.set(name, list);
const defs = new Map<string, ParsedDef[]>();
for (const [name, list] of files) {
const parsed: ParsedDef[] = [];
for (const file of list) parsed.push(...parseDefText(file));
defs.set(name, parsed);
}
return { files, defs };
}
/**
* Collect all packages from the given def map.
*
* @param rootDir the absolute path of the games root; `$variants` file paths
* resolve relative to their def file's directory within the root
*/
export function collectPackages(defMap: DefMap, rootDir: string): Package[] {
const packages = new Map<string, PackageAcc>();
const byRole = new Map<string, ParsedDef[]>();
// Group parsed defs by role.
for (const [file, defs] of defMap.defs) {
const list: ParsedDef[] = [];
for (const def of defs) {
const role = def.value['role'];
if (role !== undefined && typeof role === 'string' && ROLES.has(role as Role)) {
list.push(def);
byRole.set(file, list);
}
}
}
const accs: PackageAcc[] = [];
for (const [file, defs] of byRole) {
for (const def of defs) {
const role = def.value['role'] as Role;
if (role === 'package') {
const pkg = asPackage(def, file);
accs.push(new PackageAcc(pkg, defMap, rootDir));
}
}
}
const result: Package[] = [];
for (const acc of accs) {
acc.collect();
result.push(acc.toPackage());
}
return result;
}
/** Identity validation: `type#id` must be unique within a package. */
class PackageAcc {
readonly parts = new Map<string, Part>();
readonly surfaces = new Map<string, Surface>();
readonly setups = new Map<string, Setup>();
readonly byRole = new Map<string, string[]>();
constructor(
readonly pkg: PackageDef,
private readonly defs: DefMap,
private readonly rootDir: string,
) {}
collect() {
const include = this.pkg.include ?? ['./**/*.yaml'];
const names = this.expandIncludes(include);
for (const name of names) {
const fileDefs = this.defs.defs.get(name);
if (!fileDefs) continue;
for (const def of fileDefs) {
const role = def.value['role'];
if (typeof role !== 'string' || !ROLES.has(role as Role) || role === 'package') continue;
this.add(role as Role, def, name);
}
}
}
/** Expand `$variants` on a def object into a list of concrete objects. */
private expand(obj: Record<string, unknown>, baseName: string, source: string): Record<string, unknown>[] {
if (!('$variants' in obj)) return [obj];
const rows = expandVariants(obj['$variants'], baseName, this.defs.files, source);
const { $variants: _v, ...base } = obj;
return rows.map((row) => ({ ...base, ...row }));
}
private expandIncludes(patterns: string[]): string[] {
// Match include patterns against the parsed definitions' names, which
// cover both real files and markdown code blocks. Patterns are relative
// to the games root (e.g. `./**/*.yaml`).
const names = new Set<string>();
for (const pattern of patterns) {
const matcher = picomatch(pattern, { dot: true });
for (const name of this.defs.defs.keys()) {
if (matcher(name)) names.add(name);
}
}
return [...names];
}
private add(role: Role, def: ParsedDef, fileName: string) {
const expanded = this.expand(def.value, def.file, def.source);
for (const obj of expanded) {
switch (role) {
case 'part': {
const part = asPart(obj, fileName);
const key = `${part.type}#${part.id}`;
if (this.parts.has(key)) {
throw new BgmError(`Duplicate part "${key}"`, fileName);
}
this.parts.set(key, part);
break;
}
case 'surface': {
const surface = asSurface(obj, fileName, this.defs.files);
const key = `${surface.type}#${surface.id}`;
if (this.surfaces.has(key)) {
throw new BgmError(`Duplicate surface "${key}"`, fileName);
}
this.surfaces.set(key, surface);
break;
}
case 'setup': {
const setup = asSetup(obj, fileName);
const key = `${setup.type}#${setup.id}`;
if (this.setups.has(key)) {
throw new BgmError(`Duplicate setup "${key}"`, fileName);
}
this.setups.set(key, setup);
break;
}
}
}
}
toPackage(): Package {
return { meta: metaOf(this.pkg), parts: this.parts, surfaces: this.surfaces, setups: this.setups };
}
}
function metaOf(pkg: PackageDef) {
const { role: _role, include: _include, ...meta } = pkg;
return meta;
}
function asPackage(def: ParsedDef, source: string): PackageDef {
const obj = def.value;
try {
return validatePackage(obj) as unknown as PackageDef;
} catch (err) {
throw wrapZod(err, source);
}
}
function asPart(obj: Record<string, unknown>, source: string): Part {
try {
return validatePart(obj) as unknown as Part;
} catch (err) {
throw wrapZod(err, source);
}
}
function asSurface(
obj: Record<string, unknown>,
source: string,
defs: Map<string, DefFile[]>,
): Surface {
const value: Record<string, unknown> = { ...obj };
delete value['role'];
// Expand `candidates.$variants` on each route into a concrete array.
if (Array.isArray(value['layout'])) {
value['layout'] = value['layout'].map((route) => {
if (typeof route !== 'object' || route === null) return route;
const r = route as Record<string, unknown>;
const cand = r['candidates'];
if (cand && typeof cand === 'object' && !Array.isArray(cand) && '$variants' in cand) {
const rows = expandVariants(cand['$variants'], source, defs, source);
const { $variants: _v, ...base } = cand as Record<string, unknown>;
return { ...r, candidates: rows.map((row) => ({ ...base, ...row })) };
}
return route;
});
}
try {
return validateSurface(value) as unknown as Surface;
} catch (err) {
throw wrapZod(err, source);
}
}
function asSetup(obj: Record<string, unknown>, source: string): Setup {
const value: Record<string, unknown> = { ...obj };
delete value['role'];
try {
return validateSetup(value) as unknown as Setup;
} catch (err) {
throw wrapZod(err, source);
}
}
/** Wrap a zod error with the source location. */
function wrapZod(err: unknown, source: string): BgmError {
const message = err instanceof Error ? err.message : String(err);
return new BgmError(`Invalid definition: ${message}`, source);
}
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export * from './types.js';
export * from './schemas.js';
export * from './markdown.js';
export * from './parse.js';
export * from './variants.js';
export * from './collect.js';
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import { describe, expect, it } from 'vitest';
import { scanMarkdown } from './markdown.js';
describe('scanMarkdown', () => {
it('extracts a fenced code block with a file= name', () => {
const md = [
'# Title',
'',
'```yaml file=parts/cargo.yaml',
'role: part',
'```',
'',
'text after',
].join('\n');
const { files, fences } = scanMarkdown(md, 'harbor/harbor.md');
expect(fences).toHaveLength(1);
expect(fences[0]).toMatchObject({
info: 'yaml file=parts/cargo.yaml',
content: 'role: part',
startLine: 3,
endLine: 5,
});
expect(files).toHaveLength(1);
expect(files[0]).toMatchObject({
name: 'harbor/parts/cargo.yaml',
kind: 'yaml',
text: 'role: part',
source: 'harbor/harbor.md:3-5',
});
});
it('auto-names a block without file= from its content hash', () => {
const md = '```yaml\nrole: part\n```';
const { files } = scanMarkdown(md, 'harbor/harbor.md');
expect(files).toHaveLength(1);
expect(files[0]!.name).toMatch(/^harbor\/[0-9a-f]{8}\.yaml$/);
expect(files[0]!.kind).toBe('yaml');
});
it('ignores non-definition languages', () => {
const md = '```js\nconst x = 1;\n```';
const { files, fences } = scanMarkdown(md, 'harbor/harbor.md');
expect(files).toHaveLength(0);
expect(fences).toHaveLength(1);
});
it('ignores indented code blocks', () => {
const md = ' role: part\n';
const { files } = scanMarkdown(md, 'harbor/harbor.md');
expect(files).toHaveLength(0);
});
it('names a csv block with file= as csv', () => {
const md = '```csv file=parts/seats.csv\nseat,x\nstring,number\n0,40\n```';
const { files } = scanMarkdown(md, 'harbor/harbor.md');
expect(files[0]).toMatchObject({ name: 'harbor/parts/seats.csv', kind: 'csv' });
});
it('tracks line numbers across multiple blocks', () => {
const md = [
'```yaml file=a.yaml',
'role: part',
'```',
'',
'```yaml file=b.yaml',
'role: part',
'```',
].join('\n');
const { fences } = scanMarkdown(md, 'harbor/harbor.md');
expect(fences.map((f) => f.startLine)).toEqual([1, 5]);
});
});
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/**
* Extract virtual definition files from markdown code blocks.
*
* Each fenced code block is a virtual definition file:
* - With a `file=` segment in its info string, named relative to the
* current markdown file: a yaml block with `file=parts/cargo.yaml`.
* - Without one, auto-named `./<hash>.yaml` from its content, so every yaml
* block is discoverable by the default include pattern (all yaml in the
* same and sub folders). Identical blocks dedupe to the same hash.
*
* Markdown is tokenized with `marked`; each `code` token is a candidate
* virtual file.
*/
import * as crypto from 'node:crypto';
import { posix } from 'node:path';
import { marked } from 'marked';
import { BgmError, type DefFile } from './types.js';
/** The languages that count as definition files; others are ignored. */
const DEF_LANGS = new Set(['yaml', 'yml', 'json', 'toml']);
/** A single fenced code block. */
export interface Fence {
/** Line number (1-based) of the opening fence. */
startLine: number;
/** Line number (1-based) of the closing fence. */
endLine: number;
/** The info string content (e.g. `yaml file=parts/cargo.yaml`). */
info: string;
/** The code block's content (without the fences). */
content: string;
}
/** Result of scanning a markdown file. */
export interface MarkdownResult {
/** All fenced code blocks found, in order. */
fences: Fence[];
/** Virtual def files extracted from the definition-language blocks. */
files: DefFile[];
}
/**
* Scan `text` for fenced code blocks.
*
* @param text the markdown source
* @param sourcePath the markdown file's path-style name, for error messages
* and for resolving `file=` names relative to the markdown file
* @returns the fences and the virtual def files derived from them
*/
export function scanMarkdown(text: string, sourcePath: string): MarkdownResult {
const fences: Fence[] = [];
const files: DefFile[] = [];
const tokens = marked.lexer(text);
for (const token of tokens) {
if (token.type !== 'code' || token.codeBlockStyle === 'indented') continue;
const info = token.lang ?? '';
const startLine = lineOf(text, token.raw);
const endLine = startLine + token.raw.split(/\r?\n/).length - 1;
fences.push({ startLine, endLine, info, content: token.text });
const name = parseInfo(info);
if (name) {
files.push({
name: posix.join(posix.dirname(sourcePath), name),
text: token.text,
source: `${sourcePath}:${startLine}-${endLine}`,
kind: kindOf(name),
});
}
}
return { fences, files };
}
/**
* Parse a fence's info string for a `file=` segment and derive the virtual
* file name. Blocks without `file=` are auto-named from their content hash.
*/
function parseInfo(info: string): string | null {
const fileMatch = /file=(\S+)/.exec(info);
if (fileMatch) return fileMatch[1]!;
const lang = info.split(/\s+/)[0];
if (!lang || !DEF_LANGS.has(lang)) return null;
return `./${hash(info)}.yaml`;
}
/** Derive the def file type from its name's extension. */
function kindOf(name: string): DefFile['kind'] {
if (name.endsWith('.json')) return 'json';
if (name.endsWith('.toml')) return 'toml';
if (name.endsWith('.md') || name.endsWith('.markdown')) return 'markdown';
if (name.endsWith('.csv')) return 'csv';
return 'yaml';
}
/** A stable content hash for auto-named blocks. */
function hash(text: string): string {
return crypto.createHash('sha1').update(text).digest('hex').slice(0, 8);
}
/** The 1-based line number where `raw` starts within `text`. */
function lineOf(text: string, raw: string): number {
const idx = text.indexOf(raw);
if (idx < 0) return 1;
return text.slice(0, idx).split(/\r?\n/).length;
}
/**
* Virtual files gathered from markdown code blocks, keyed by path-style name.
* Multiple blocks may share a name (e.g. several `file=parts/tokens.yaml`
* blocks); each is kept as a separate entry. Identical blocks dedupe to the
* same hash name.
*/
export type VirtualFiles = Map<string, DefFile[]>;
/**
* Collect virtual def files from a set of markdown sources.
*
* @param markdownFiles real markdown files, keyed by their path-style name
* relative to the games root, e.g. `harbor/harbor.md`
* @returns the virtual files, keyed by name
*/
export function collectVirtualFiles(markdownFiles: Map<string, string>): VirtualFiles {
const files = new Map<string, DefFile[]>();
for (const [name, text] of markdownFiles) {
const result = scanMarkdown(text, name);
for (const file of result.files) {
const list = files.get(file.name) ?? [];
list.push(file);
files.set(file.name, list);
}
}
return files;
}
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/**
* Parse raw definition files (yaml/json/toml text) into JSON objects.
*
* A def file's document can be either a single JSON object (the root) or a
* list of objects; both are handled per docs/bgm-format.md §3. In list mode,
* each object is a separate definition.
*/
import * as fs from 'node:fs';
import * as path from 'node:path';
import { parse as parseYaml } from 'yaml';
import { parse as parseToml } from 'smol-toml';
import { BgmError, type DefFile, type ParsedDef } from './types.js';
/**
* Parse a def file's text into a list of definition objects.
*
* @returns the parsed objects; the root object (index `-1`) or the list
* items (index `0..n`)
*/
export function parseDefText(file: DefFile): ParsedDef[] {
if (file.kind === 'csv') return [];
const text = file.text.trim();
if (!text) return [];
const out: ParsedDef[] = [];
let doc: unknown;
try {
doc = parseText(file.kind, text);
} catch (err) {
const message = err instanceof Error ? err.message : String(err);
throw new BgmError(`Failed to parse ${file.kind}: ${message}`, file.source);
}
const push = (value: unknown, index: number) => {
if (value !== null && typeof value === 'object' && !Array.isArray(value)) {
out.push({ file: file.name, index, value: value as Record<string, unknown>, source: file.source });
} else if (value !== null) {
throw new BgmError(`Expected a JSON object, got ${typeof value}`, file.source);
}
};
if (Array.isArray(doc)) {
doc.forEach((item, index) => push(item, index));
} else {
push(doc, -1);
}
return out;
}
function parseText(kind: DefFile['kind'], text: string): unknown {
switch (kind) {
case 'json':
return JSON.parse(text);
case 'yaml':
return parseYaml(text);
case 'toml':
return parseToml(text);
case 'markdown':
// Markdown-only blocks contain no definitions; handled by the caller.
return null;
}
}
/**
* Parse a directory of real files (yaml/json/toml/md) into def files.
* Markdown files are also returned here as-is; code-block extraction happens
* in `collect.ts` via `scanMarkdown`.
*
* @param dir absolute directory to scan
* @param root the path-style root the file names are relative to (for
* consistent naming with virtual files), e.g. `harbor`
*/
export function readDefFiles(dir: string, root: string): DefFile[] {
const out: DefFile[] = [];
const walk = (current: string, rel: string) => {
for (const entry of fs.readdirSync(current, { withFileTypes: true })) {
const abs = path.join(current, entry.name);
const relPath = rel ? `${rel}/${entry.name}` : entry.name;
if (entry.isDirectory()) {
walk(abs, relPath);
} else if (/csv$/i.test(entry.name)) {
out.push({
name: `${root}/${relPath}`,
text: fs.readFileSync(abs, 'utf8'),
source: abs,
kind: 'csv',
});
} else if (/\.(ya?ml|json|toml|md|markdown)$/i.test(entry.name)) {
const kind = kindOf(entry.name);
out.push({
name: `${root}/${relPath}`,
text: fs.readFileSync(abs, 'utf8'),
source: abs,
kind,
});
}
}
};
walk(dir, '');
return out;
}
function kindOf(name: string): DefFile['kind'] {
if (name.endsWith('.json')) return 'json';
if (name.endsWith('.toml')) return 'toml';
if (name.endsWith('.md') || name.endsWith('.markdown')) return 'markdown';
if (name.endsWith('.csv')) return 'csv';
return 'yaml';
}
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/**
* Zod schemas for the bgm definition roles.
*
* These validate the raw definition objects (after `$variants` expansion)
* and produce the typed `Part` / `Surface` / `Setup` / `PackageDef` values.
* See docs/bgm-format.md for the format's concrete behavior.
*/
import { z } from 'zod';
import type { PackageDef, Part, Setup, Surface } from './types.js';
const crop = z.tuple([z.number(), z.number(), z.number(), z.number()]);
const size = z.tuple([z.number(), z.number(), z.number()]);
const surfaceSize = z.tuple([z.number(), z.number()]);
const stacking = z.object({
curve: z.string().optional(),
limit: z.number().optional(),
align: z.enum(['start', 'end', 'center']).optional(),
steps: z.number().optional(),
});
const route = z.object({
route: z.string(),
x: z.number().optional(),
y: z.number().optional(),
rotation: z.number().optional(),
candidates: z.array(z.record(z.string(), z.unknown())).optional(),
stacking: stacking.optional(),
});
const partSchema = z.object({
type: z.string().min(1),
id: z.string().min(1),
face: z.string().optional(),
faceCrop: crop.optional(),
back: z.string().optional(),
backCrop: crop.optional(),
shape: z.string().optional(),
size: size.optional(),
fillet: z.number().optional(),
});
const surfaceSchema = z.object({
type: z.string().min(1),
id: z.string().min(1),
size: surfaceSize.optional(),
layout: z.array(route),
});
const setupSchema = z.object({
type: z.string().min(1),
id: z.string().min(1),
setup: z.record(z.string(), z.union([z.string(), z.array(z.string())])),
});
const packageSchema = z.object({
role: z.literal('package'),
id: z.string().min(1),
title: z.string().optional(),
designer: z.string().optional(),
development: z.string().optional(),
publisher: z.string().optional(),
players: z.number().optional(),
language: z.string().optional(),
include: z.array(z.string()).optional(),
});
/** Validate a raw part definition. */
export function validatePart(value: Record<string, unknown>): Part {
return partSchema.parse(value) as unknown as Part;
}
/** Validate a raw surface definition. */
export function validateSurface(value: Record<string, unknown>): Surface {
return surfaceSchema.parse(value) as unknown as Surface;
}
/** Validate a raw setup definition. */
export function validateSetup(value: Record<string, unknown>): Setup {
return setupSchema.parse(value) as unknown as Setup;
}
/** Validate a raw package definition. */
export function validatePackage(value: Record<string, unknown>): PackageDef {
return packageSchema.parse(value) as unknown as PackageDef;
}
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/**
* Core types for the board game manifest (bgm) format.
*
* A package is the container for a game's definitions. Raw definitions are
* discovered as JSON objects from yaml/json/toml files and from markdown
* code blocks, then assembled into a `Package` (see `collect.ts` / `emit.ts`).
*
* The concrete behavior of the format is described in `docs/bgm-format.md`.
*/
/** Part value types. */
export type PartValueType = 'image' | 'crop' | 'size' | 'sprite';
/**
* A crop tuple `[col, row, cols, rows]`. Divides the image into a
* `cols` x `rows` grid and picks the cell at `[col, row]`.
*/
export type Crop = [col: number, row: number, cols: number, rows: number];
/** A size tuple `[width, height, depth]` in mm units. */
export type Size = [width: number, height: number, depth: number];
/** A surface size `[width, height]` in mm units. */
export type SurfaceSize = [width: number, height: number];
/** `type#id` identification used across roles (e.g. `harbor:token#wood`). */
export type PartRef = string;
/**
* The identification of a part. `package:type#id` is the full, package-qualified
* string placed on the board via setup and referenced by routes.
*/
export interface PartId {
package: string;
type: string;
id: string;
}
export interface PackageMeta {
/** Package id (also used as the module name, e.g. `bgm/harbor`). */
id: string;
/** Game name. */
title?: string;
designer?: string;
/** Artist / developer credit. */
development?: string;
publisher?: string;
/** Player count. */
players?: number;
/** Language code, e.g. `en`. */
language?: string;
}
/** A game component: identified by `package:type#id`, placed via setup. */
export interface Part {
type: string;
id: string;
/** Face sprite url (texture). */
face?: string;
/** Crop for `face`. */
faceCrop?: Crop;
/** Back sprite url; defaults to the face sprite. */
back?: string;
/** Crop for `back`. */
backCrop?: Crop;
/** Shape sprite url; traced for its profile to create the mesh. */
shape?: string;
/** `[width, height, depth]` in mm; the token is scaled to fit the box. */
size?: Size;
/** Fillet radius in mm; defaults to `0`. */
fillet?: number;
/** Extra fields from the source definition, kept for forwards compatibility. */
[key: string]: unknown;
}
/** A candidate for a route's `:param`, carrying its own anchor. */
export interface Candidate {
[param: string]: unknown;
x?: number;
y?: number;
rotation?: number;
}
export interface Route {
/** Express-style url path with named params, e.g. `/dock/:seat`. */
route: string;
x: number;
y: number;
rotation: number;
/** Candidates to match `:param` against; each carries its own anchor. */
candidates?: Candidate[];
/** Stacking strategy for multiple parts on the path. */
stacking?: Stacking;
}
export interface Stacking {
/** SVG path string to spread stacked parts along, relative to the anchor. */
curve?: string;
/** How many parts to display. `0` shows all, `3` the first 3, `-3` the last 3. */
limit?: number;
/** `start`, `end`, or `center` of the curve. */
align?: 'start' | 'end' | 'center';
/** Maximum parts per curve length unit; defaults to `1`. */
steps?: number;
}
/** A view over the state store, purely for visual rendering. */
export interface Surface {
type: string;
id: string;
/** Reference `[width, height]` in mm; may be scaled to fit the table. */
size?: SurfaceSize;
layout: Route[];
}
export type SetupValue = string | string[];
/** Seeds the state store: a map from path to a stack of parts. */
export interface Setup {
type: string;
id: string;
setup: Record<string, SetupValue>;
}
export type Role = 'package' | 'part' | 'surface' | 'setup';
/**
* A raw definition object as written by the author. Definitions can be the
* root of a file/block or an item in the file's list.
*/
export interface RawDef {
role?: Role;
[key: string]: unknown;
}
/** The four definition roles. */
export type RoleDef = PackageDef | PartDef | SurfaceDef | SetupDef;
export interface PackageDef extends PackageMeta {
role: 'package';
/** Git-style path patterns of the defs that make up the package. */
include?: string[];
}
export interface PartDef extends Part {
role: 'part';
}
export interface SurfaceDef extends Surface {
role: 'surface';
}
export interface SetupDef extends Setup {
role: 'setup';
}
/** A virtual definition file: a real file or a markdown code block. */
export interface DefFile {
/** Path-style name; for code blocks, relative to their markdown file. */
name: string;
/** Raw text content. */
text: string;
/** Source location for error messages (real path or `file.md:12-19`). */
source: string;
/** File type derived from the name's extension. */
kind: 'yaml' | 'json' | 'toml' | 'markdown' | 'csv';
}
/** A single parsed definition (one JSON object from a def file). */
export interface ParsedDef {
file: string;
/** Index into the file's parsed object list; `-1` for the root object. */
index: number;
/** The raw definition object. */
value: Record<string, unknown>;
/** Source location for error messages (real path or `file.md:12-19`). */
source: string;
}
/**
* A fully collected package: the parts, surfaces, and setups reachable from
* the package declaration's `include` patterns.
*/
export interface Package {
meta: PackageMeta;
/** All parts by `type#id`. */
parts: Map<string, Part>;
/** All surfaces by `type#id`. */
surfaces: Map<string, Surface>;
/** All setups by `type#id`. */
setups: Map<string, Setup>;
}
/** Errors during loading, carrying the source location when available. */
export class BgmError extends Error {
constructor(message: string, readonly location?: string) {
super(location ? `${location}: ${message}` : message);
this.name = 'BgmError';
}
}
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import { describe, expect, it } from 'vitest';
import { parseCsvData, expandVariants } from './variants.js';
import type { DefFile } from './types.js';
function defFile(name: string, text: string): DefFile {
return { name, text, source: name, kind: 'csv' };
}
describe('parseCsvData', () => {
it('parses the spec example with an empty array', () => {
const csv = [
'name,parents',
'string,string[]',
'clark,[jonathan;martha]',
'bruce,[]',
].join('\n');
const { rows, header } = parseCsvData(csv, 'test');
expect(header).toEqual(['name', 'parents']);
expect(rows).toEqual([
{ name: 'clark', parents: ['jonathan', 'martha'] },
{ name: 'bruce', parents: [] },
]);
});
it('parses a crop tuple', () => {
const csv = [
'id,faceCrop',
'string,[number;number;number;number]',
'fish,[0;0;5;2]',
'grain,[1;0;5;2]',
].join('\n');
const { rows } = parseCsvData(csv, 'test');
expect(rows).toEqual([
{ id: 'fish', faceCrop: [0, 0, 5, 2] },
{ id: 'grain', faceCrop: [1, 0, 5, 2] },
]);
});
it('throws a BgmError on a type mismatch', () => {
const csv = ['n', 'number', 'not-a-number'].join('\n');
expect(() => parseCsvData(csv, 'test')).toThrow(/Invalid CSV/);
});
it('allows a header and schema with no data rows', () => {
const { rows } = parseCsvData('a\nstring', 'test');
expect(rows).toEqual([]);
});
});
describe('expandVariants', () => {
it('parses inline CSV when the value contains a newline', () => {
const rows = expandVariants('a,b\nstring,number\nx,1', 'pkg/def.yaml', new Map(), 'src');
expect(rows).toEqual([{ a: 'x', b: 1 }]);
});
it('resolves a path against the def file directory', () => {
const defs = new Map<string, DefFile[]>([
['pkg/parts/seats.csv', [defFile('pkg/parts/seats.csv', 'seat\nnumber\n0\n1')]],
]);
const rows = expandVariants('./seats.csv', 'pkg/parts/board.yaml', defs, 'src');
expect(rows).toEqual([{ seat: 0 }, { seat: 1 }]);
});
it('throws when the referenced csv is missing', () => {
expect(() => expandVariants('./nope.csv', 'pkg/def.yaml', new Map(), 'src')).toThrow(
/CSV not found/,
);
});
it('throws when $variants is not a string', () => {
expect(() => expandVariants(42, 'pkg/def.yaml', new Map(), 'src')).toThrow(
/must be a path or inline CSV/,
);
});
});
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/**
* The `$variants` directive: parse a CSV into a typed object array and
* extend the original object with each row.
*
* Per docs/bgm-format.md §1:
* - The CSV's first row is the header, the second row is the type declaration
* (`string`, `number`, `string[]`, `[number;number;number;number]`, ...),
* the remaining rows are data.
* - Rows are validated against a schema derived from the type row.
* - A cell for an array/tuple type uses `;` as the element separator
* (`[0;0;5;2]`), because `,` is the CSV delimiter.
* - `$variants` can be a file/URL path *or* an inline CSV string: a value
* containing a newline is inline CSV, otherwise it is a path.
*
* Parsing is delegated to `typed-csv`'s `parseCsv`, which implements exactly
* this header/schema/data layout and validates each row against a schema
* derived from the type row.
*
* Paths resolve against the virtual def map — the same names `include` and
* `file=` resolve against — so a CSV can be a real file or a markdown code
* block (` ```csv file=parts/cargo.csv `).
*/
import * as path from 'node:path';
import { parseCsv } from 'typed-csv/csv-loader';
import { BgmError, type DefFile } from './types.js';
/** The parsed rows of a CSV, converted to typed values. */
export interface CsvData {
/** Column names from the header row. */
header: string[];
/** One object per data row. */
rows: Record<string, unknown>[];
}
/**
* Parse CSV text into typed row objects using `typed-csv`.
*
* @param text the CSV source (header + schema + data rows)
* @param source the source location, for error messages
*/
export function parseCsvData(text: string, source: string): CsvData {
try {
const result = parseCsv(text, { resolveReferences: false });
return { header: result.propertyConfigs.map((p) => p.name), rows: result.data };
} catch (err) {
const message = err instanceof Error ? err.message : String(err);
throw new BgmError(`Invalid CSV: ${message}`, source);
}
}
/**
* Look up a CSV in the virtual def map and parse it.
*
* @param name the CSV's path-style name (relative to the games root)
* @param defs the virtual def map
* @param source the referencing def file's source, for error messages
*/
export function parseCsvByName(
name: string,
defs: Map<string, DefFile[]>,
source: string,
): CsvData {
const list = defs.get(name);
const file = list?.[0];
if (!file) {
throw new BgmError(`CSV not found: "${name}"`, source);
}
if (file.kind !== 'csv') {
throw new BgmError(`Expected a CSV file, got "${file.kind}" for "${name}"`, source);
}
return parseCsvData(file.text, file.source);
}
/**
* Expand a `$variants` value into rows.
*
* @param value the `$variants` value: a path or inline CSV
* @param baseName the path-style name of the referencing def file; a path
* value resolves relative to its directory
* @param defs the virtual def map, for resolving the path
* @param source the def file's source location, for error messages
*/
export function expandVariants(
value: unknown,
baseName: string,
defs: Map<string, DefFile[]>,
source: string,
): Record<string, unknown>[] {
if (typeof value !== 'string') {
throw new BgmError('`$variants` must be a path or inline CSV string', source);
}
if (value.includes('\n')) {
return parseCsvData(value, source).rows;
}
const name = path.posix.join(path.posix.dirname(baseName), value);
return parseCsvByName(name, defs, source).rows;
}
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{
"extends": "../../tsconfig.base.json",
"compilerOptions": {
"outDir": "./dist",
"rootDir": "./src",
"lib": ["ES2022", "DOM"]
},
"include": ["src"]
}
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import { defineConfig } from 'vitest/config';
export default defineConfig({
test: {
include: ['src/**/*.test.ts'],
},
});