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30x 30x 30x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 3x 3x 1x 1x 1x 1x 1x 1x 1x 1x 2x 2x 2x 2x 2x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 3x 3x 1x 1x 1x 1x 1x 1x 1x 1x 1x 2x 2x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 2x 2x 2x 1x 1x 1x 1x 1x 1x 1x 1x 4x 3x 3x 1x 4x 1x 1x 1x 1x 1x 1x | /**
* @fileoverview State Validation for Coherent.js
* Provides JSON Schema validation and custom validators for state management
* @module @coherentjs/core/state/state-validation
*/
/**
* @typedef {Object} ValidationOptions
* @property {Object} [schema] - JSON Schema for validation
* @property {Object<string, Function>} [validators] - Custom validator functions
* @property {boolean} [strict=false] - Strict mode (throw on validation errors)
* @property {boolean} [coerce=false] - Coerce types to match schema
* @property {Function} [onError] - Validation error callback
* @property {boolean} [validateOnSet=true] - Validate on state updates
* @property {boolean} [validateOnGet=false] - Validate on state reads
* @property {Array<string>} [required] - Required fields
* @property {boolean} [allowUnknown=true] - Allow unknown properties
*/
/**
* @typedef {Object} ValidationResult
* @property {boolean} valid - Whether validation passed
* @property {Array<ValidationError>} errors - Array of validation errors
* @property {*} value - Validated/coerced value
*/
/**
* @typedef {Object} ValidationError
* @property {string} path - Property path that failed validation
* @property {string} message - Error message
* @property {string} type - Error type
* @property {*} value - The invalid value
* @property {*} expected - Expected value/type
*/
/**
* Simple JSON Schema validator
*/
class SchemaValidator {
constructor(schema, options = {}) {
this.schema = schema;
this.options = {
coerce: false,
allowUnknown: true,
...options
};
}
/**
* Validate value against schema
* @param {*} value - Value to validate
* @param {Object} schema - Schema to validate against
* @param {string} path - Current path in object
* @returns {ValidationResult} Validation result
*/
validate(value, schema = this.schema, path = '') {
const errors = [];
let coercedValue = value;
// Type validation
if (schema.type) {
const typeResult = this.validateType(value, schema.type, path);
if (!typeResult.valid) {
errors.push(...typeResult.errors);
if (!this.options.coerce) {
return { valid: false, errors, value };
}
}
coercedValue = typeResult.value;
}
// Enum validation
if (schema.enum) {
const enumResult = this.validateEnum(coercedValue, schema.enum, path);
if (!enumResult.valid) {
errors.push(...enumResult.errors);
}
}
// String validations
if (schema.type === 'string') {
const stringResult = this.validateString(coercedValue, schema, path);
if (!stringResult.valid) {
errors.push(...stringResult.errors);
}
}
// Number validations
if (schema.type === 'number' || schema.type === 'integer') {
const numberResult = this.validateNumber(coercedValue, schema, path);
if (!numberResult.valid) {
errors.push(...numberResult.errors);
}
}
// Array validations
if (schema.type === 'array') {
const arrayResult = this.validateArray(coercedValue, schema, path);
if (!arrayResult.valid) {
errors.push(...arrayResult.errors);
}
coercedValue = arrayResult.value;
}
// Object validations
if (schema.type === 'object') {
const objectResult = this.validateObject(coercedValue, schema, path);
if (!objectResult.valid) {
errors.push(...objectResult.errors);
}
coercedValue = objectResult.value;
}
// Custom validation function
if (schema.validate && typeof schema.validate === 'function') {
const customResult = schema.validate(coercedValue);
if (customResult !== true) {
errors.push({
path,
message: typeof customResult === 'string' ? customResult : 'Custom validation failed',
type: 'custom',
value: coercedValue
});
}
}
return {
valid: errors.length === 0,
errors,
value: coercedValue
};
}
validateType(value, type, path) {
const actualType = Array.isArray(value) ? 'array' : typeof value;
const errors = [];
let coercedValue = value;
// Support array of types
const types = Array.isArray(type) ? type : [type];
const isValid = types.some(t => {
if (t === 'array') return Array.isArray(value);
if (t === 'null') return value === null;
if (t === 'integer') return typeof value === 'number' && Number.isInteger(value);
return typeof value === t;
});
if (!isValid) {
if (this.options.coerce) {
// Try to coerce
const primaryType = types[0];
try {
if (primaryType === 'string') {
coercedValue = String(value);
} else if (primaryType === 'number') {
coercedValue = Number(value);
if (isNaN(coercedValue)) {
errors.push({
path,
message: `Cannot coerce "${value}" to number`,
type: 'type',
value,
expected: primaryType
});
}
} else if (primaryType === 'boolean') {
coercedValue = Boolean(value);
} else if (primaryType === 'integer') {
coercedValue = parseInt(value, 10);
if (isNaN(coercedValue)) {
errors.push({
path,
message: `Cannot coerce "${value}" to integer`,
type: 'type',
value,
expected: primaryType
});
}
}
} catch {
errors.push({
path,
message: `Cannot coerce value to ${primaryType}`,
type: 'type',
value,
expected: primaryType
});
}
} else {
errors.push({
path,
message: `Expected type ${types.join(' or ')}, got ${actualType}`,
type: 'type',
value,
expected: type
});
}
}
return {
valid: errors.length === 0,
errors,
value: coercedValue
};
}
validateEnum(value, enumValues, path) {
const errors = [];
if (!enumValues.includes(value)) {
errors.push({
path,
message: `Value must be one of: ${enumValues.join(', ')}`,
type: 'enum',
value,
expected: enumValues
});
}
return { valid: errors.length === 0, errors };
}
validateString(value, schema, path) {
const errors = [];
if (schema.minLength !== undefined && value.length < schema.minLength) {
errors.push({
path,
message: `String length must be >= ${schema.minLength}`,
type: 'minLength',
value
});
}
if (schema.maxLength !== undefined && value.length > schema.maxLength) {
errors.push({
path,
message: `String length must be <= ${schema.maxLength}`,
type: 'maxLength',
value
});
}
if (schema.pattern) {
const regex = new RegExp(schema.pattern);
if (!regex.test(value)) {
errors.push({
path,
message: `String does not match pattern: ${schema.pattern}`,
type: 'pattern',
value
});
}
}
if (schema.format) {
const formatResult = this.validateFormat(value, schema.format, path);
if (!formatResult.valid) {
errors.push(...formatResult.errors);
}
}
return { valid: errors.length === 0, errors };
}
validateFormat(value, format, path) {
const errors = [];
const formats = {
email: /^[^\s@]+@[^\s@]+\.[^\s@]+$/,
url: /^https?:\/\/.+/,
uuid: /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i,
date: /^\d{4}-\d{2}-\d{2}$/,
'date-time': /^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}/
};
if (formats[format] && !formats[format].test(value)) {
errors.push({
path,
message: `String does not match format: ${format}`,
type: 'format',
value,
expected: format
});
}
return { valid: errors.length === 0, errors };
}
validateNumber(value, schema, path) {
const errors = [];
if (schema.minimum !== undefined && value < schema.minimum) {
errors.push({
path,
message: `Number must be >= ${schema.minimum}`,
type: 'minimum',
value
});
}
if (schema.maximum !== undefined && value > schema.maximum) {
errors.push({
path,
message: `Number must be <= ${schema.maximum}`,
type: 'maximum',
value
});
}
if (schema.exclusiveMinimum !== undefined && value <= schema.exclusiveMinimum) {
errors.push({
path,
message: `Number must be > ${schema.exclusiveMinimum}`,
type: 'exclusiveMinimum',
value
});
}
if (schema.exclusiveMaximum !== undefined && value >= schema.exclusiveMaximum) {
errors.push({
path,
message: `Number must be < ${schema.exclusiveMaximum}`,
type: 'exclusiveMaximum',
value
});
}
if (schema.multipleOf !== undefined && value % schema.multipleOf !== 0) {
errors.push({
path,
message: `Number must be multiple of ${schema.multipleOf}`,
type: 'multipleOf',
value
});
}
return { valid: errors.length === 0, errors };
}
validateArray(value, schema, path) {
const errors = [];
const coercedValue = [...value];
if (schema.minItems !== undefined && value.length < schema.minItems) {
errors.push({
path,
message: `Array must have at least ${schema.minItems} items`,
type: 'minItems',
value
});
}
if (schema.maxItems !== undefined && value.length > schema.maxItems) {
errors.push({
path,
message: `Array must have at most ${schema.maxItems} items`,
type: 'maxItems',
value
});
}
if (schema.uniqueItems) {
const seen = new Set();
const duplicates = [];
value.forEach((item, index) => {
const key = JSON.stringify(item);
if (seen.has(key)) {
duplicates.push(index);
}
seen.add(key);
});
if (duplicates.length > 0) {
errors.push({
path,
message: 'Array items must be unique',
type: 'uniqueItems',
value
});
}
}
// Validate items
if (schema.items) {
value.forEach((item, index) => {
const itemPath = `${path}[${index}]`;
const itemResult = this.validate(item, schema.items, itemPath);
if (!itemResult.valid) {
errors.push(...itemResult.errors);
}
if (this.options.coerce) {
coercedValue[index] = itemResult.value;
}
});
}
return {
valid: errors.length === 0,
errors,
value: coercedValue
};
}
validateObject(value, schema, path) {
const errors = [];
const coercedValue = { ...value };
// Required properties
if (schema.required) {
schema.required.forEach(prop => {
if (!(prop in value)) {
errors.push({
path: path ? `${path}.${prop}` : prop,
message: `Required property "${prop}" is missing`,
type: 'required',
value: undefined
});
}
});
}
// Validate properties
if (schema.properties) {
Object.entries(schema.properties).forEach(([prop, propSchema]) => {
if (prop in value) {
const propPath = path ? `${path}.${prop}` : prop;
const propResult = this.validate(value[prop], propSchema, propPath);
if (!propResult.valid) {
errors.push(...propResult.errors);
}
if (this.options.coerce) {
coercedValue[prop] = propResult.value;
}
}
});
}
// Additional properties
if (schema.additionalProperties === false && !this.options.allowUnknown) {
const allowedProps = new Set(Object.keys(schema.properties || {}));
Object.keys(value).forEach(prop => {
if (!allowedProps.has(prop)) {
errors.push({
path: path ? `${path}.${prop}` : prop,
message: `Unknown property "${prop}"`,
type: 'additionalProperties',
value: value[prop]
});
}
});
}
// Min/max properties
const propCount = Object.keys(value).length;
if (schema.minProperties !== undefined && propCount < schema.minProperties) {
errors.push({
path,
message: `Object must have at least ${schema.minProperties} properties`,
type: 'minProperties',
value
});
}
if (schema.maxProperties !== undefined && propCount > schema.maxProperties) {
errors.push({
path,
message: `Object must have at most ${schema.maxProperties} properties`,
type: 'maxProperties',
value
});
}
return {
valid: errors.length === 0,
errors,
value: coercedValue
};
}
}
/**
* Create validated state manager
* @param {Object} initialState - Initial state
* @param {ValidationOptions} options - Validation options
* @returns {Object} Validated state manager
*/
export function createValidatedState(initialState = {}, options = {}) {
const opts = {
schema: null,
validators: {},
strict: false,
coerce: false,
onError: null,
validateOnSet: true,
validateOnGet: false,
required: [],
allowUnknown: true,
...options
};
const schemaValidator = opts.schema ? new SchemaValidator(opts.schema, {
coerce: opts.coerce,
allowUnknown: opts.allowUnknown
}) : null;
let state = { ...initialState };
const listeners = new Set();
const validationErrors = new Map();
/**
* Validate state
* @param {Object} value - State to validate
* @param {string} key - State key (for partial validation)
* @returns {ValidationResult} Validation result
*/
function validateState(value, key = null) {
const errors = [];
let validatedValue = value;
// JSON Schema validation
if (schemaValidator) {
const schema = key && opts.schema.properties
? opts.schema.properties[key]
: opts.schema;
const result = schemaValidator.validate(value, schema, key || '');
if (!result.valid) {
errors.push(...result.errors);
}
validatedValue = result.value;
}
// Custom validators
if (key && opts.validators[key]) {
const validator = opts.validators[key];
const result = validator(value);
if (result !== true) {
errors.push({
path: key,
message: typeof result === 'string' ? result : 'Validation failed',
type: 'custom',
value
});
}
} else if (!key) {
// Run custom validators for all fields when validating full state
Object.entries(opts.validators).forEach(([fieldKey, validator]) => {
if (fieldKey in value) {
const result = validator(value[fieldKey]);
if (result !== true) {
errors.push({
path: fieldKey,
message: typeof result === 'string' ? result : 'Validation failed',
type: 'custom',
value: value[fieldKey]
});
}
}
});
}
// Required fields
if (opts.required.length > 0 && !key) {
opts.required.forEach(field => {
if (!(field in value)) {
errors.push({
path: field,
message: `Required field "${field}" is missing`,
type: 'required',
value: undefined
});
}
});
}
return {
valid: errors.length === 0,
errors,
value: validatedValue
};
}
/**
* Get state
* @param {string} key - State key
* @returns {*} State value
*/
function getState(key) {
const value = key ? state[key] : { ...state };
if (opts.validateOnGet) {
const result = validateState(value, key);
if (!result.valid) {
validationErrors.set(key || '__root__', result.errors);
if (opts.onError) {
opts.onError(result.errors);
}
}
}
return value;
}
/**
* Set state
* @param {Object|Function} updates - State updates
* @throws {Error} If validation fails in strict mode
*/
function setState(updates) {
const oldState = { ...state };
if (typeof updates === 'function') {
updates = updates(oldState);
}
// Create the new full state for validation
const newState = { ...state, ...updates };
// Validate before setting
if (opts.validateOnSet) {
const result = validateState(newState);
if (!result.valid) {
validationErrors.set('__root__', result.errors);
if (opts.onError) {
opts.onError(result.errors);
}
if (opts.strict) {
const error = new Error('Validation failed');
error.validationErrors = result.errors;
throw error;
}
// Don't update state if validation fails in non-strict mode
return;
}
// Use coerced value if coercion is enabled
if (opts.coerce) {
const updatedKeys = Object.keys(updates);
const newUpdates = {};
updatedKeys.forEach(key => {
if (result.value[key] !== state[key]) {
newUpdates[key] = result.value[key];
}
});
updates = newUpdates;
}
// Clear errors on successful validation
validationErrors.clear();
}
state = { ...state, ...updates };
// Notify listeners
listeners.forEach(listener => {
try {
listener(state, oldState);
} catch (error) {
console.error('Listener error:', error);
}
});
}
/**
* Subscribe to state changes
* @param {Function} listener - Change listener
* @returns {Function} Unsubscribe function
*/
function subscribe(listener) {
listeners.add(listener);
return () => listeners.delete(listener);
}
/**
* Get validation errors
* @param {string} key - State key
* @returns {Array<ValidationError>} Validation errors
*/
function getErrors(key = '__root__') {
return validationErrors.get(key) || [];
}
/**
* Check if state is valid
* @returns {boolean} Whether state is valid
*/
function isValid() {
const result = validateState(state);
if (!result.valid) {
validationErrors.set('__root__', result.errors);
}
return result.valid;
}
/**
* Validate specific field
* @param {string} key - Field key
* @param {*} value - Field value
* @returns {ValidationResult} Validation result
*/
function validateField(key, value) {
return validateState(value, key);
}
return {
getState,
setState,
subscribe,
getErrors,
isValid,
validateField,
validate: () => validateState(state)
};
}
/**
* Common validators
*/
export const validators = {
/**
* Email validator
* @param {string} value - Email to validate
* @returns {boolean|string} True if valid, error message otherwise
*/
email: (value) => {
if (typeof value !== 'string') return 'Email must be a string';
if (!/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(value)) return 'Invalid email format';
return true;
},
/**
* URL validator
* @param {string} value - URL to validate
* @returns {boolean|string} True if valid, error message otherwise
*/
url: (value) => {
if (typeof value !== 'string') return 'URL must be a string';
try {
new URL(value);
return true;
} catch {
return 'Invalid URL format';
}
},
/**
* Range validator
* @param {number} min - Minimum value
* @param {number} max - Maximum value
* @returns {Function} Validator function
*/
range: (min, max) => (value) => {
if (typeof value !== 'number') return 'Value must be a number';
if (value < min || value > max) return `Value must be between ${min} and ${max}`;
return true;
},
/**
* Length validator
* @param {number} min - Minimum length
* @param {number} max - Maximum length
* @returns {Function} Validator function
*/
length: (min, max) => (value) => {
if (typeof value !== 'string') return 'Value must be a string';
if (value.length < min || value.length > max) {
return `Length must be between ${min} and ${max}`;
}
return true;
},
/**
* Pattern validator
* @param {RegExp|string} pattern - Pattern to match
* @returns {Function} Validator function
*/
pattern: (pattern) => (value) => {
if (typeof value !== 'string') return 'Value must be a string';
const regex = typeof pattern === 'string' ? new RegExp(pattern) : pattern;
if (!regex.test(value)) return `Value does not match pattern: ${pattern}`;
return true;
},
/**
* Required validator
* @param {*} value - Value to validate
* @returns {boolean|string} True if valid, error message otherwise
*/
required: (value) => {
if (value === undefined || value === null || value === '') {
return 'Value is required';
}
return true;
}
};
export default {
createValidatedState,
validators,
SchemaValidator
};
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