Added basic-tree

source/data/field-configuration-factories.mjs

@@ -26,3 +26,33 @@ export function required(description) {
 export function typed_required(coercion_function, description) {
 	return new Field_Configuration((value) => value !== undefined, coercion_function, null, description);
 }
+
+export function symbol_set(description_to_name_mapping, description=null) {
+
+	const symbols_by_name = Object.fromEntries(Object.keys(description_to_name_mapping).map(k => [k, Symbol(k)]));
+	const valid_symbols = new Set(Object.values(symbols_by_name));
+
+	const descriptions_by_symbol = Object.fromEntries(Object.entries(symbols_by_name).map(([n, s]) => [s, description_to_name_mapping[n]]));
+
+	const result = new Field_Configuration(
+		(v) => valid_symbols.has(v),
+		(v) => typeof v === 'string' ? symbols_by_name[v] : v,	// TODO: Assert that we could look up the symbol
+		null,
+		description,
+	);
+
+	// HACK: We are just tacking these on here but the proper method would be to create a proper subclass for the symbol set field type which is planned.
+	result.symbols = symbols_by_name;
+	result.symbol_descriptions = descriptions_by_symbol;
+
+	return result;
+
+}
+
+export function cardinal_value(default_value=null, description=null) {
+	return new Field_Configuration((v) => Number.isInteger(v) && v >= 1, parseInt, () => default_value, description);
+}
+
+export function natural_value(default_value=null, description=null) {
+	return new Field_Configuration((v) => Number.isInteger(v) && v >= 0, parseInt, () => default_value, description);
+}