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export default class FormValidator {
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static rules = {
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required: (value) => {
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if (!value || (typeof value === 'string' && value.trim() === '')) {
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return 'This field is required';
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}
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return null;
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},
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email: (value) => {
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const regex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
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return regex.test(value) ? null : 'Invalid email address';
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},
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minLength: (min) => (value) => {
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return (value?.length || 0) >= min ? null : `Minimum ${min} characters required`;
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},
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maxLength: (max) => (value) => {
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return (value?.length || 0) <= max ? null : `Maximum ${max} characters allowed`;
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},
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pattern: (regex, message = 'Invalid format') => (value) => {
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return regex.test(value) ? null : message;
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},
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custom: (fn) => (value) => {
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try {
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const error = fn(value);
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return error || null;
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} catch (err) {
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return 'Validation error';
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}
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}
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};
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static validate(formData, schema) {
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const errors = {};
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for (const [field, rules] of Object.entries(schema)) {
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const value = formData[field];
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for (const rule of rules) {
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let error = null;
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if (typeof rule === 'function') {
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error = rule(value);
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}
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if (error) {
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errors[field] = error;
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break;
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}
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}
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}
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return {
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isValid: Object.keys(errors).length === 0,
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errors
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};
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}
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static createSchema() {
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return {};
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}
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}
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