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const { isGenericListType, makeWrappedResultEnvelope, responseEnvelopeContainsError, traverseZList } = require( './utils.js' );
const { ZEnvelopeWrapper, ZWrapper } = require( './ZWrapper.js' );
const { convertItemArrayToZList } = require( '../function-schemata/javascript/src/utils.js' );
const { error, makeErrorInNormalForm } = require( '../function-schemata/javascript/src/error.js' );
const { validatesAsReference } = require( '../function-schemata/javascript/src/schema.js' );
/**
* Error class for throwing a Z22/'Evaluation response' (envelope) that
* contains an error (in Z22K2/metadata).
*/
class ZResponseError extends Error {
constructor( message, envelope ) {
super( message );
this.name = 'ZResponseError';
this.envelope = envelope;
}
}
class EvaluatorError extends Error { }
class Implementation {
constructor( Z14, ZID ) {
this.invariants_ = null;
this.lazyVariables_ = new Set();
this.lazyReturn_ = false;
this.doValidate_ = true;
this.Z14_ = Z14;
// Persistent ID for the implementation; null if there is none
this.ZID_ = ZID;
Object.defineProperty( this, 'invariants', {
get: function () {
return this.invariants_;
},
set: function ( invariants ) {
this.invariants_ = invariants;
}
} );
Object.defineProperty( this, 'doValidate', {
get: function () {
return this.doValidate_;
},
set: function ( doValidate ) {
this.doValidate_ = doValidate;
}
} );
}
hasLazyVariable( variableName ) {
return this.lazyVariables_.has( variableName );
}
returnsLazy() {
return this.lazyReturn_;
}
getZID() {
return this.ZID_;
}
getZ14() {
return this.Z14_;
}
async execute( zobject, argumentList ) {
const executionResult = await this.executeInternal( zobject, argumentList );
try {
if ( !( executionResult instanceof ZEnvelopeWrapper ) ) {
// TODO (T365194): This extra call to ZWrapper.create is just
// to "verify" (-ish) that the Z22K2/Metadata is in normal form
// and doesn't contain anything weird. If it does contain
// something weird, ZWrapper.create() throws an error here.
// We should either strengthen the evaluator's post-conditions
// to obviate this or do a proper validation check here.
ZWrapper.create(
executionResult.Z22K2, this.getZ14().scope_, this.getZ14().parent_ );
}
const result = ZWrapper.create(
executionResult, this.getZ14().scope_, this.getZ14().parent_ );
return result;
} catch ( err ) {
return makeWrappedResultEnvelope(
null,
makeErrorInNormalForm(
error.invalid_format,
[ JSON.stringify( executionResult ) ] ) );
}
}
/**
* Creates and returns a function implementation for the given Z14,
* as an instance of one of the subclasses Composition, Evaluated,
* or BuiltIn. If an error occurs, an instance of subclass
* ImplementationError is returned.
*
* invariants and doValidate are used locally in this method. Otherwise, they
* can be set and retrieved via their accessors (e.g. invariants).
*
* @param {Object} Z14 the implementation
* @param {Object} Z14Envelope
* @param {string} ZID
* @return {Implementation}
* @throws {ZResponseError} If the call to resolve() returns an error
*/
static async create( Z14, Z14Envelope, ZID ) {
Iif ( typeof Z14 === 'undefined' ) {
return null;
}
Iif ( responseEnvelopeContainsError( Z14Envelope ) ) {
throw new ZResponseError( 'Error returned from call to resolve', Z14Envelope );
}
if ( Z14.Z14K4 !== undefined ) {
const BuiltInZID = Z14.Z14K4.Z6K1;
const { getFunction, getLazyVariables, getLazyReturn } = require( './builtins.js' );
const builtin = getFunction( BuiltInZID );
const lazyVariables = getLazyVariables( BuiltInZID );
const lazyReturn = getLazyReturn( BuiltInZID );
// eslint-disable-next-line no-use-before-define
return new BuiltIn( Z14, BuiltInZID, builtin, lazyVariables, lazyReturn );
}
if ( Z14.Z14K2 !== undefined ) {
// eslint-disable-next-line no-use-before-define
return new Composition( Z14, ZID );
}
if ( Z14.Z14K3 !== undefined ) {
// eslint-disable-next-line no-use-before-define
return new Evaluated( Z14, ZID );
}
throw new ZResponseError( 'Implementation did not specify Z14K[234]', Z14Envelope );
}
}
class BuiltIn extends Implementation {
constructor( Z14, ZID, functor, lazyVariables, lazyReturn ) {
super( Z14, ZID );
for ( const variable of lazyVariables ) {
this.lazyVariables_.add( variable );
}
this.lazyReturn_ = lazyReturn;
this.functor_ = functor;
}
/**
* Calls this implementation's functor with the provided arguments.
*
* @param {Object} zobject
* @param {Array} argumentList
* @return {Object} the result of calling this.functor_ with provided arguments
*/
executeInternal( zobject, argumentList ) {
const keys = [];
const nameToArgument = new Map();
for ( const argumentDict of argumentList ) {
keys.push( argumentDict.name );
nameToArgument.set( argumentDict.name, argumentDict.argument );
}
keys.sort();
const callArgs = [];
for ( const key of keys ) {
callArgs.push( nameToArgument.get( key ) );
}
callArgs.push( this.invariants_ );
return this.functor_( ...callArgs );
}
}
/**
* Used for resolving code in an implementation
*
* @param {Object} codeObject an unresolved ZObject
* @param {Object} implementation the implementation object of the ZObject to resolve
* @return {Object} resolved ZObject
*/
async function resolveCodeObject( codeObject, implementation ) {
// Code string.
const envelope = await codeObject.resolveEphemeral(
[ 'Z16K1', 'Z61K1' ],
implementation.invariants,
/* ignoreList= */ null,
/* resolveInternals= */ false,
implementation.doValidate );
Iif ( responseEnvelopeContainsError( envelope ) ) {
return envelope;
}
// Programming language string.
return await codeObject.resolveEphemeral(
[ 'Z16K2' ],
implementation.invariants,
/* ignoreList= */ null,
/* resolveInternals= */ false,
implementation.doValidate );
}
/**
* Used for resolving objects in a List Type during implementation
*
* @param {Object} codeConverterList the List object
* @param {string} converterKey e.g. 'Z64K1'
* @param {Object} implementation the implementation object of the ZObject to resolve
* @return {Promise<Array[Object]>} the result of resolving objects and keys in the list,
* caching them for future calls, and finally running callback on the List elements
*/
async function resolveCodeConverterList( codeConverterList, converterKey, implementation ) {
return await traverseZList(
codeConverterList,
async ( tail ) => {
await tail.resolveEphemeral(
[ 'K1', converterKey ],
implementation.invariants,
/* ignoreList= */ null,
/* resolveInternals= */ false,
implementation.doValidate );
// TODO (T360243): Error early here if resolution failed.
await resolveCodeObject(
tail.getNameEphemeral( 'K1' ).getNameEphemeral( converterKey ),
implementation );
} );
}
/**
* Resolves any remaining unresolved elements in List type,
* returning null or the Object containing error if any arise
*
* @param {Object} sourceZWrapper ZObject, an instance of ZWrapper
* @param {Object} destinationObject
* @param {string} destinationObjectKey
* @param {string} codeConverterListKey
* @param {string} converterKey
* @param {Object} implementation the implementation object of the ZObject to resolve
* @return {Object|null} null or ZObject with an error
*/
async function maybeResolveListElementType(
sourceZWrapper, destinationObject, destinationObjectKey,
codeConverterListKey, converterKey, implementation ) {
const typeKey = sourceZWrapper.asJSON();
if ( !isGenericListType( typeKey ) ) {
return null;
}
const elementTypeEnvelope = await sourceZWrapper.Z4K2.K1.Z3K1.resolve(
implementation.invariants, /* ignoreList= */ null, /* resolveInternals= */ true,
implementation.doValidate );
Iif ( responseEnvelopeContainsError( elementTypeEnvelope ) ) {
return elementTypeEnvelope;
}
const elementType = elementTypeEnvelope.Z22K1;
// destinationObject[ destinationObjectKey ].Z4K2.K1.Z3K1 = elementType.asJSONEphemeral();
const codeConverterList = elementType[ codeConverterListKey ];
if ( codeConverterList === undefined ) {
// Type does not have type converters; return.
return null;
}
await resolveCodeConverterList( codeConverterList, converterKey, implementation );
destinationObject[ destinationObjectKey ].Z4K2.K1.Z3K1[
codeConverterListKey
] = codeConverterList.asJSONEphemeral();
return null;
}
class Evaluated extends Implementation {
constructor( Z14, ZID ) {
super( Z14, ZID );
}
/**
* Calls this implementation's functor with the provided arguments.
*
* @param {Object} zobject
* @param {Array} argumentList
* @return {Object} the result of calling this.functor_ with provided arguments
*/
async executeInternal( zobject, argumentList ) {
// Arguments should already be fully resolved, but any other attributes
// of the Z7 which are Z9s/Z18s must be resolved before dispatching
// to the function evaluator.
const Z7 = {};
Z7.Z1K1 = zobject.Z1K1.asJSON();
await ( zobject.resolveEphemeral(
[ 'Z7K1', 'Z8K2' ], this.invariants, /* ignoreList= */ null,
/* resolveInternals= */ true, this.doValidate ) );
const Z7K1Envelope = await ( zobject.Z7K1.resolve(
this.invariants, /* ignoreList= */ null,
/* resolveInternals= */ true, this.doValidate ) );
const Z7K1 = Z7K1Envelope.Z22K1;
Z7.Z7K1 = Z7K1.asJSONEphemeral();
// TODO: Eliminate this back-and-forth ZWrapper conversion if possible.
const Z8K4 = ZWrapper.create(
convertItemArrayToZList( [ this.getZ14().asJSONEphemeral() ] ),
this.getZ14().scope_,
this.getZ14().parent_ );
const implementation = this;
Z7.Z7K1.Z8K4 = Z8K4.asJSONEphemeral();
// Return type may be a function call and must be resolved to allow for binary encoding.
const returnTypeEnvelope = await ( Z7K1.Z8K2.resolve(
this.invariants, /* ignoreList= */ null,
/* resolveInternals= */ true, this.doValidate ) );
Iif ( responseEnvelopeContainsError( returnTypeEnvelope ) ) {
return returnTypeEnvelope;
}
Z7.Z7K1.Z8K2 = returnTypeEnvelope.Z22K1.asJSONEphemeral();
for ( const argumentDict of argumentList ) {
Z7[ argumentDict.name ] = argumentDict.argument.asJSON();
}
// Get the implementation, which may need to be dereferenced.
let firstImplementation = this.Z14_;
// Code implementation.
await ( firstImplementation.resolveEphemeral(
[ 'Z14K3' ], implementation.invariants,
/* ignoreList= */ null,
/* resolveInternals= */ false, implementation.doValidate ) );
const codeObjectEnvelope = await resolveCodeObject(
firstImplementation.Z14K3, implementation );
Iif ( responseEnvelopeContainsError( codeObjectEnvelope ) ) {
return codeObjectEnvelope;
}
Z7.Z7K1.Z8K4.K1 = firstImplementation.asJSONEphemeral();
firstImplementation = Z7.Z7K1.Z8K4.K1;
const codeObject = firstImplementation.Z14K3;
const codingLanguageObject = codeObject.Z16K1;
const referenceObj = codingLanguageObject.Z9K1;
const referencedExplicitObj =
this.invariants.mappedProgrammingLangObj( codingLanguageObject );
const programmingLanguage =
validatesAsReference( codingLanguageObject ).isValid() ?
referenceObj : referencedExplicitObj;
const evaluator = this.invariants.evaluatorFor( programmingLanguage );
if ( evaluator === null ) {
throw new EvaluatorError( `No evaluator is available for ${ programmingLanguage }` );
}
// Do type conversion of inputs, if necessary.
for ( const argumentDict of argumentList ) {
const argumentType = argumentDict.argument.Z1K1;
if ( argumentType instanceof ZWrapper ) {
const typeResult = await argumentDict.argument.Z1K1.resolve(
implementation.invariants_
);
Iif ( responseEnvelopeContainsError( typeResult ) ) {
return typeResult;
}
const theType = typeResult.Z22K1;
const toCodeConverterList = theType.getNameEphemeral( 'Z4K7' );
if ( toCodeConverterList !== undefined ) {
await resolveCodeConverterList( toCodeConverterList, 'Z46K3', implementation );
}
Z7[ argumentDict.name ].Z1K1 = theType.asJSONEphemeral();
const listResolutionEnvelope = await maybeResolveListElementType(
argumentDict.argument.Z1K1, Z7[ argumentDict.name ], 'Z1K1',
'Z4K7', 'Z46K3', this );
Iif (
listResolutionEnvelope !== null &&
responseEnvelopeContainsError( listResolutionEnvelope ) ) {
return listResolutionEnvelope;
}
}
}
const returnType = Z7K1.getNameEphemeral( 'Z8K2' );
Eif ( returnType instanceof ZWrapper ) {
const typeResult = await returnType.resolve(
implementation.invariants
);
Iif ( responseEnvelopeContainsError( typeResult ) ) {
return typeResult;
}
const theType = typeResult.Z22K1;
const fromCodeConverterList = theType.getNameEphemeral( 'Z4K8' );
if ( fromCodeConverterList !== undefined ) {
await resolveCodeConverterList( fromCodeConverterList, 'Z64K3', implementation );
}
Z7.Z7K1.Z8K2 = theType.asJSONEphemeral();
const listResolutionEnvelope = await maybeResolveListElementType(
zobject.Z7K1.Z8K2, Z7.Z7K1, 'Z8K2', 'Z4K8', 'Z64K3', this );
Iif (
listResolutionEnvelope !== null &&
responseEnvelopeContainsError( listResolutionEnvelope ) ) {
return listResolutionEnvelope;
}
}
let fetchedResult;
try {
fetchedResult = await evaluator.evaluate( Z7 );
} catch ( e ) {
throw new EvaluatorError( e.message );
}
if ( fetchedResult.ok ) {
// Assume the evaluator is returning Z22s.
const resultEnvelope = await fetchedResult.json();
return resultEnvelope;
}
const statusCode = fetchedResult.status;
const errorText = await fetchedResult.text();
throw new EvaluatorError( `Function evaluation failed with status ${ statusCode }: ${ errorText }` );
}
}
class Composition extends Implementation {
constructor( Z14, ZID ) {
super( Z14, ZID );
this.composition_ = Z14.Z14K2.asJSON();
}
/**
* Creates a ZObject, i.e. a ZWrapper instance, and resolves it.
*
* @return {Promise<ZWrapper>} A result envelope zobject representing the result.
*/
async executeInternal() {
return await ZWrapper.create(
this.composition_, this.getZ14().scope_, this.getZ14().parent_
).resolve(
this.invariants_, /* ignoreList= */ null, /* resolveInternals= */ true,
/* doValidate= */ this.doValidate_ );
}
}
module.exports = {
BuiltIn,
Composition,
Evaluated,
EvaluatorError,
Implementation,
ZResponseError
};
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