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const { convertArrayToKnownTypedList, isString, isKey, isZid, wrapInZ6, wrapInZ9, wrapInKeyReference, wrapInQuote } = require( './utils.js' );
const { dataDir, readYaml } = require( './fileUtils.js' );
const errorTypes = require( './error.js' );
class ErrorFormatter {
/**
* Read and parse the yaml file with the error type descriptors
*
* @return {Array}
*/
static get errorDescriptors() {
if ( !this._errorDescriptors ) {
const descriptorPath = dataDir( 'errors', 'error_types.yaml' );
this._errorDescriptors = readYaml( descriptorPath ).patterns.keywords;
}
return this._errorDescriptors;
}
/**
* Root function to transform an array of Ajv error objects to a root Z5
* object with all the nested errors identified by the builtin
* ZErrorTypes (Z50).
*
* @param {Array} errors
* @return {Object}
*/
static createRootZError( errors ) {
const Z5s = [];
// descriptors found for parser errors
const descriptors = [];
for ( const error of errors ) {
const descriptor = this.matchDescriptor( error );
// Ajv returns duplicates, so we need to check for them and ignore
const isDuplicate = descriptors.find(
( d ) => d.path === error.instancePath && d.descriptor === descriptor
);
if ( descriptor && !isDuplicate ) {
descriptors.push( { path: error.instancePath, descriptor } );
Z5s.push( [
error,
this.createZErrorInstance( descriptor.errorType, error )
] );
}
}
const errorTree = this.buildErrorTree( Z5s );
Iif ( errorTree.children.length === 0 && errorTree.errors.length === 0 ) {
return null;
} else {
return this.getZObjectFromErrorTree( errorTree );
}
}
/**
* Builds a tree of errors from a list of Z5s. Each node indicates where the
* errors ocurred in the data object. Each Z5 is associated with one of the
* nodes. Z5s can be associated to nodes that are not leaves. The function
* returns the root object of the tree.
*
* @param {Array} Z5s
* @return {Object}
*/
static buildErrorTree( Z5s ) {
const root = {
key: 'root',
children: {},
errors: []
};
for ( const [ parserError, Z5 ] of Z5s ) {
// only ZnKn are considered as part of the path
const path = parserError.instancePath.match( /\bZ\d+K\d+\b/g );
// no path means it's a root error
if ( !path || path.length === 0 ) {
root.errors.push( Z5 );
} else {
// find the leaf node based on the path creating intermediary nodes if required
const leaf = path.reduce( ( node, key ) => {
if ( !node.children[ key ] ) {
node.children[ key ] = {
key,
children: {},
errors: []
};
}
return node.children[ key ];
}, root );
leaf.errors.push( Z5 );
}
}
return root;
}
/**
* Transforms a tree of errors in a single Z5 object. Z5s are aggregated
* into multiple errors/Z509 and non-leaf nodes wrap those errors in not
* wellformed/Z526.
*
* @param {Object} root
* @return {Object}
*/
static getZObjectFromErrorTree( root ) {
const children = Object.values( root.children );
const childrenErrors = [];
for ( const child of children ) {
childrenErrors.push( this.getZObjectFromErrorTree( child ) );
}
childrenErrors.push( ...root.errors );
const aggregatedZ5 = childrenErrors.length === 1 ?
childrenErrors[ 0 ] :
this.createZErrorList( childrenErrors );
return root.key === 'root' ?
this.createValidationZError( aggregatedZ5 ) :
this.createZKeyError( root.key, aggregatedZ5 );
}
/**
* Create a ZError (Z5) of the type "Key not wellformed" (Z526)
*
* @param {string} key
* @param {Object} Z5
* @return {Object}
*/
static createZKeyError( key, Z5 ) {
return this.createZErrorInstance(
errorTypes.error.not_wellformed_value,
{
key: key,
value: Z5
}
);
}
/**
* Create a ZError (Z5) of the type "Not wellformed" (Z502)
*
* @param {Object} Z5
* @return {Object}
*/
static createValidationZError( Z5 ) {
return this.createZErrorInstance(
errorTypes.error.not_wellformed,
{
subtype: Z5.Z5K1,
value: Z5
}
);
}
/**
* Create a ZError (Z5) of the type "Multiple errors" (Z509)
*
* @param {*} array
* @return {Object|null}
*/
static createZErrorList( array ) {
return this.createZErrorInstance(
errorTypes.error.list_of_errors,
{
list: convertArrayToKnownTypedList( array, 'Z5' )
}
);
}
/**
* Wrap an error message in a Z5/Error of type Z507/'Error in evaluation'.
* Typically, the message will come from a caught error (an ordinary error,
* not a ZError).
*
* @param {string} message
* @param {Object} call the Z7/'Function call' being evaluated when the error arose,
* quoted as Z99
* @return {Object} a Z5/Error object
*/
static wrapMessageInEvaluationError( message, call ) {
const wrappedError = this.createZErrorInstance(
errorTypes.error.unknown_error,
{
errorInformation: message
}
);
return this.createZErrorInstance(
errorTypes.error.error_in_evaluation,
{
functionCall: call,
propagatedError: wrappedError
}
);
}
/**
* Matches an Ajv parser error to one of the error descriptors in
* Wikifunctions. When no descriptor is found for an error, the
* function returns null.
*
* @param {Object} err
* @return {Object|null}
*/
static matchDescriptor( err ) {
const candidates = this.errorDescriptors[ err.keyword ];
if ( candidates ) {
return candidates.find( ( descriptor ) => {
switch ( err.keyword ) {
case 'required':
return !descriptor.keywordArgs.missing ||
descriptor.keywordArgs.missing === err.params.missingProperty;
case 'additionalProperties':
return true;
case 'type':
case 'pattern':
default:
return this.matchTypeDescriptor( descriptor, err );
}
} );
}
return null;
}
/**
* Evaluates whether a error descriptor matches the given Ajv parser error of
* the "type" kind.
*
* @param {Object} descriptor
* @param {Object} err
* @return {boolean}
*/
static matchTypeDescriptor( descriptor, err ) {
// if dataPointer is specified but not found in the actual data path
if ( descriptor.dataPointer.length > 0 &&
!err.instancePath.endsWith( descriptor.dataPointer[ 0 ] ) ) {
return false;
}
if ( descriptor.keywordArgs.used ) {
const dataType = typeof err.data;
let expandedType;
if ( Array.isArray( err.data ) ) {
expandedType = 'array';
} else if ( err.data === null ) {
expandedType = 'null';
} else {
expandedType = dataType;
}
return descriptor.keywordArgs.used.includes( expandedType );
}
return descriptor.keywordArgs.expected === err.params.type;
}
/**
* Creates an instance of a typed error given its errorType and an array
* with the values of its keys.
*
* @param {string} errorType
* @param {Object} errorKeys
* @return {Object}
*/
static createTypedError( errorType, errorKeys ) {
const typedError = {
Z1K1: {
Z1K1: wrapInZ9( 'Z7' ),
Z7K1: wrapInZ9( 'Z885' ),
Z885K1: wrapInZ9( errorType )
}
};
for ( let index = 0; index < errorKeys.length; index++ ) {
if ( errorKeys[ index ] ) {
typedError[ `${ errorType }K${ index + 1 }` ] = errorKeys[ index ];
}
}
return typedError;
}
/**
* Create a ZError (Z5) of a given ZErrorType
*
* N.B. Before adding an errorType in the switch statement, check whether that errorType is used
* in error_types.yaml, and whether your addition will affect the result of createRootZError.
*
* @param {string} errorType
* @param {Object} err
* @return {Object}
* @throws Will throw an error if the error type is not valid
*/
static createZErrorInstance( errorType, err = {} ) {
const errorKeys = [];
if ( !isString( errorType ) || !isZid( errorType ) ) {
throw new Error( `Invalid error type: ${ errorType }` );
}
switch ( errorType ) {
case errorTypes.error.unknown_error:
errorKeys.push( err.errorInformation );
break;
case errorTypes.error.not_wellformed:
errorKeys.push( err.subtype );
errorKeys.push( err.value );
break;
case errorTypes.error.error_in_evaluation:
errorKeys.push( wrapInQuote( err.functionCall ) );
errorKeys.push( err.propagatedError );
break;
case errorTypes.error.list_of_errors:
errorKeys.push( err.list );
break;
case errorTypes.error.key_not_found:
errorKeys.push( wrapInKeyReference( err.params.missingProperty ) );
errorKeys.push( wrapInQuote( err.data ) );
break;
case errorTypes.error.resolved_object_without_z2k2:
errorKeys.push( wrapInQuote( err.data ) );
break;
case errorTypes.error.zobject_must_not_be_number_or_boolean_or_null:
errorKeys.push( wrapInQuote( err.data ) );
break;
case errorTypes.error.missing_type:
errorKeys.push( wrapInQuote( err.data ) );
break;
case errorTypes.error.z1k1_must_not_be_string_or_array:
errorKeys.push( wrapInQuote( err.data ) );
break;
case errorTypes.error.invalid_key:
errorKeys.push( wrapInZ6( err.params.additionalProperty ) );
break;
case errorTypes.error.not_wellformed_value:
errorKeys.push( wrapInKeyReference( err.key ) );
errorKeys.push( err.value );
break;
case errorTypes.error.unable_to_canonicalize:
errorKeys.push( wrapInQuote( err.zobject ) );
errorKeys.push( err.propagatedError );
break;
case errorTypes.error.z6_without_z6k1:
errorKeys.push( wrapInQuote( err.data ) );
break;
case errorTypes.error.z6k1_must_be_string:
errorKeys.push( wrapInQuote( err.data ) );
break;
case errorTypes.error.z9_without_z9k1:
errorKeys.push( wrapInQuote( err.data ) );
break;
case errorTypes.error.z9k1_must_be_string:
errorKeys.push( wrapInQuote( err.data ) );
break;
case errorTypes.error.invalid_zreference:
errorKeys.push( wrapInZ6( err.data ) );
break;
case errorTypes.error.disallowed_root_object:
errorKeys.push( wrapInQuote( err.data ) );
break;
default:
// Unknown error
Object.keys( err ).forEach( ( key ) => {
if ( isKey( key ) ) {
errorKeys.push( err[ key ] );
}
} );
break;
}
// Create a typed error instance with errorType->error
const typedError = this.createTypedError( errorType, errorKeys );
// Create error Z5
return {
Z1K1: wrapInZ9( 'Z5' ),
Z5K1: wrapInZ9( errorType ),
Z5K2: typedError
};
}
}
module.exports = ErrorFormatter;
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