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173 lines
7.4 KiB
Plaintext
173 lines
7.4 KiB
Plaintext
import { Check } from '../check/index.mjs';
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import { Clone } from '../clone/index.mjs';
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import { Deref, Pushref } from '../deref/index.mjs';
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import { Kind } from '../../type/symbols/index.mjs';
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// ------------------------------------------------------------------
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// ValueGuard
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// ------------------------------------------------------------------
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import { IsArray, IsDate, IsFunction, IsObject, IsUndefined, HasPropertyKey } from '../guard/index.mjs';
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// ------------------------------------------------------------------
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// TypeGuard
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// ------------------------------------------------------------------
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import { IsKind } from '../../type/guard/kind.mjs';
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// ------------------------------------------------------------------
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// ValueOrDefault
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// ------------------------------------------------------------------
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function ValueOrDefault(schema, value) {
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const defaultValue = HasPropertyKey(schema, 'default') ? schema.default : undefined;
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const clone = IsFunction(defaultValue) ? defaultValue() : Clone(defaultValue);
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return IsUndefined(value) ? clone : IsObject(value) && IsObject(clone) ? Object.assign(clone, value) : value;
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}
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// ------------------------------------------------------------------
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// HasDefaultProperty
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// ------------------------------------------------------------------
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function HasDefaultProperty(schema) {
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return IsKind(schema) && 'default' in schema;
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}
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// ------------------------------------------------------------------
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// Types
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// ------------------------------------------------------------------
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function FromArray(schema, references, value) {
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// if the value is an array, we attempt to initialize it's elements
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if (IsArray(value)) {
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for (let i = 0; i < value.length; i++) {
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value[i] = Visit(schema.items, references, value[i]);
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}
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return value;
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}
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// ... otherwise use default initialization
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const defaulted = ValueOrDefault(schema, value);
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if (!IsArray(defaulted))
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return defaulted;
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for (let i = 0; i < defaulted.length; i++) {
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defaulted[i] = Visit(schema.items, references, defaulted[i]);
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}
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return defaulted;
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}
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function FromDate(schema, references, value) {
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// special case intercept for dates
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return IsDate(value) ? value : ValueOrDefault(schema, value);
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}
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function FromImport(schema, references, value) {
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const definitions = globalThis.Object.values(schema.$defs);
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const target = schema.$defs[schema.$ref];
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return Visit(target, [...references, ...definitions], value);
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}
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function FromIntersect(schema, references, value) {
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const defaulted = ValueOrDefault(schema, value);
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return schema.allOf.reduce((acc, schema) => {
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const next = Visit(schema, references, defaulted);
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return IsObject(next) ? { ...acc, ...next } : next;
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}, {});
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}
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function FromObject(schema, references, value) {
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const defaulted = ValueOrDefault(schema, value);
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// return defaulted
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if (!IsObject(defaulted))
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return defaulted;
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const knownPropertyKeys = Object.getOwnPropertyNames(schema.properties);
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// properties
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for (const key of knownPropertyKeys) {
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// note: we need to traverse into the object and test if the return value
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// yielded a non undefined result. Here we interpret an undefined result as
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// a non assignable property and continue.
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const propertyValue = Visit(schema.properties[key], references, defaulted[key]);
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if (IsUndefined(propertyValue))
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continue;
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defaulted[key] = Visit(schema.properties[key], references, defaulted[key]);
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}
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// return if not additional properties
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if (!HasDefaultProperty(schema.additionalProperties))
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return defaulted;
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// additional properties
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for (const key of Object.getOwnPropertyNames(defaulted)) {
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if (knownPropertyKeys.includes(key))
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continue;
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defaulted[key] = Visit(schema.additionalProperties, references, defaulted[key]);
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}
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return defaulted;
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}
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function FromRecord(schema, references, value) {
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const defaulted = ValueOrDefault(schema, value);
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if (!IsObject(defaulted))
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return defaulted;
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const additionalPropertiesSchema = schema.additionalProperties;
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const [propertyKeyPattern, propertySchema] = Object.entries(schema.patternProperties)[0];
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const knownPropertyKey = new RegExp(propertyKeyPattern);
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// properties
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for (const key of Object.getOwnPropertyNames(defaulted)) {
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if (!(knownPropertyKey.test(key) && HasDefaultProperty(propertySchema)))
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continue;
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defaulted[key] = Visit(propertySchema, references, defaulted[key]);
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}
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// return if not additional properties
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if (!HasDefaultProperty(additionalPropertiesSchema))
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return defaulted;
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// additional properties
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for (const key of Object.getOwnPropertyNames(defaulted)) {
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if (knownPropertyKey.test(key))
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continue;
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defaulted[key] = Visit(additionalPropertiesSchema, references, defaulted[key]);
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}
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return defaulted;
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}
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function FromRef(schema, references, value) {
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return Visit(Deref(schema, references), references, ValueOrDefault(schema, value));
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}
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function FromThis(schema, references, value) {
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return Visit(Deref(schema, references), references, value);
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}
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function FromTuple(schema, references, value) {
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const defaulted = ValueOrDefault(schema, value);
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if (!IsArray(defaulted) || IsUndefined(schema.items))
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return defaulted;
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const [items, max] = [schema.items, Math.max(schema.items.length, defaulted.length)];
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for (let i = 0; i < max; i++) {
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if (i < items.length)
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defaulted[i] = Visit(items[i], references, defaulted[i]);
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}
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return defaulted;
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}
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function FromUnion(schema, references, value) {
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const defaulted = ValueOrDefault(schema, value);
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for (const inner of schema.anyOf) {
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const result = Visit(inner, references, Clone(defaulted));
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if (Check(inner, references, result)) {
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return result;
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}
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}
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return defaulted;
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}
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function Visit(schema, references, value) {
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const references_ = Pushref(schema, references);
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const schema_ = schema;
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switch (schema_[Kind]) {
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case 'Array':
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return FromArray(schema_, references_, value);
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case 'Date':
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return FromDate(schema_, references_, value);
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case 'Import':
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return FromImport(schema_, references_, value);
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case 'Intersect':
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return FromIntersect(schema_, references_, value);
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case 'Object':
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return FromObject(schema_, references_, value);
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case 'Record':
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return FromRecord(schema_, references_, value);
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case 'Ref':
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return FromRef(schema_, references_, value);
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case 'This':
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return FromThis(schema_, references_, value);
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case 'Tuple':
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return FromTuple(schema_, references_, value);
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case 'Union':
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return FromUnion(schema_, references_, value);
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default:
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return ValueOrDefault(schema_, value);
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}
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}
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/** `[Mutable]` Generates missing properties on a value using default schema annotations if available. This function does not check the value and returns an unknown type. You should Check the result before use. Default is a mutable operation. To avoid mutation, Clone the value first. */
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export function Default(...args) {
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return args.length === 3 ? Visit(args[0], args[1], args[2]) : Visit(args[0], [], args[1]);
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}
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