MCP ASCII Charts

import { ChartData, McpToolParams } from '../types/index.js'; import { isValidColor, getColorList } from './colors.js'; export class ValidationError extends Error { constructor(message: string) { super(message); this.name = 'ValidationError'; } } export function validateChartData(params: McpToolParams): ChartData { if (!params.data || !Array.isArray(params.data)) { throw new ValidationError('Data must be an array of numbers'); } if (params.data.length === 0) { throw new ValidationError('Data array cannot be empty'); } if (!params.data.every(value => typeof value === 'number' && !isNaN(value))) { throw new ValidationError('All data values must be valid numbers'); } if (params.labels && !Array.isArray(params.labels)) { throw new ValidationError('Labels must be an array of strings'); } if (params.labels && params.labels.length !== params.data.length) { throw new ValidationError('Labels array must have the same length as data array'); } if (params.width && (typeof params.width !== 'number' || params.width < 10 || params.width > 200)) { throw new ValidationError('Width must be a number between 10 and 200'); } if (params.height && (typeof params.height !== 'number' || params.height < 5 || params.height > 50)) { throw new ValidationError('Height must be a number between 5 and 50'); } if (params.color && typeof params.color !== 'string') { throw new ValidationError('Color must be a string'); } if (params.color && !isValidColor(params.color)) { throw new ValidationError(`Invalid color. Available colors: ${getColorList().join(', ')}`); } if (params.title && typeof params.title !== 'string') { throw new ValidationError('Title must be a string'); } return { data: params.data, labels: params.labels, title: params.title, width: params.width || 60, height: params.height || 15, color: params.color || 'white' }; } export function validateNumericRange(value: number, min: number, max: number, name: string): void { if (value < min || value > max) { throw new ValidationError(`${name} must be between ${min} and ${max}`); } }