var List = require('../utils/list'); var hasOwnProperty = Object.prototype.hasOwnProperty; function isValidNumber(value) { // Number.isInteger(value) && value >= 0 return ( typeof value === 'number' && isFinite(value) && Math.floor(value) === value && value >= 0 ); } function isValidLocation(loc) { return ( Boolean(loc) && isValidNumber(loc.offset) && isValidNumber(loc.line) && isValidNumber(loc.column) ); } function createNodeStructureChecker(type, fields) { return function checkNode(node, warn) { if (!node || node.constructor !== Object) { return warn(node, 'Type of node should be an Object'); } for (var key in node) { var valid = true; if (hasOwnProperty.call(node, key) === false) { continue; } if (key === 'type') { if (node.type !== type) { warn(node, 'Wrong node type `' + node.type + '`, expected `' + type + '`'); } } else if (key === 'loc') { if (node.loc === null) { continue; } else if (node.loc && node.loc.constructor === Object) { if (typeof node.loc.source !== 'string') { key += '.source'; } else if (!isValidLocation(node.loc.start)) { key += '.start'; } else if (!isValidLocation(node.loc.end)) { key += '.end'; } else { continue; } } valid = false; } else if (fields.hasOwnProperty(key)) { for (var i = 0, valid = false; !valid && i < fields[key].length; i++) { var fieldType = fields[key][i]; switch (fieldType) { case String: valid = typeof node[key] === 'string'; break; case Boolean: valid = typeof node[key] === 'boolean'; break; case null: valid = node[key] === null; break; default: if (typeof fieldType === 'string') { valid = node[key] && node[key].type === fieldType; } else if (Array.isArray(fieldType)) { valid = node[key] instanceof List; } } } } else { warn(node, 'Unknown field `' + key + '` for ' + type + ' node type'); } if (!valid) { warn(node, 'Bad value for `' + type + '.' + key + '`'); } } for (var key in fields) { if (hasOwnProperty.call(fields, key) && hasOwnProperty.call(node, key) === false) { warn(node, 'Field `' + type + '.' + key + '` is missed'); } } }; } function processStructure(name, nodeType) { var structure = nodeType.structure; var fields = { type: String, loc: true }; var docs = { type: '"' + name + '"' }; for (var key in structure) { if (hasOwnProperty.call(structure, key) === false) { continue; } var docsTypes = []; var fieldTypes = fields[key] = Array.isArray(structure[key]) ? structure[key].slice() : [structure[key]]; for (var i = 0; i < fieldTypes.length; i++) { var fieldType = fieldTypes[i]; if (fieldType === String || fieldType === Boolean) { docsTypes.push(fieldType.name); } else if (fieldType === null) { docsTypes.push('null'); } else if (typeof fieldType === 'string') { docsTypes.push('<' + fieldType + '>'); } else if (Array.isArray(fieldType)) { docsTypes.push('List'); // TODO: use type enum } else { throw new Error('Wrong value `' + fieldType + '` in `' + name + '.' + key + '` structure definition'); } } docs[key] = docsTypes.join(' | '); } return { docs: docs, check: createNodeStructureChecker(name, fields) }; } module.exports = { getStructureFromConfig: function(config) { var structure = {}; if (config.node) { for (var name in config.node) { if (hasOwnProperty.call(config.node, name)) { var nodeType = config.node[name]; if (nodeType.structure) { structure[name] = processStructure(name, nodeType); } else { throw new Error('Missed `structure` field in `' + name + '` node type definition'); } } } } return structure; } };