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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 | 1x 19x 1x 18x 1x 17x 17x 1x 15x 15x 19x 19x 2x 2x 2x 17x 17x 19x 19x 19x 19x 19x 19x 16x 16x 40x 19x 19x 19x | import { EvaluatorError } from '@metamask/kernel-errors';
import { mergeDisjointRecords } from '@metamask/kernel-utils';
import type { Logger } from '@metamask/logger';
import { extractCapabilities } from '@ocap/kernel-agents/capabilities/capability';
import type { CapabilityRecord } from '@ocap/kernel-agents/types';
import { ifDefined } from '@ocap/kernel-agents/utils';
import { makeCompartment } from './compartment.ts';
import { processEvaluationError } from './evaluator-error.ts';
import {
CommentMessage,
EvaluationMessage,
ImportMessage,
ResultMessage,
} from './messages.ts';
import type { ReplTranscript, StatementMessage } from './messages.ts';
import { prepareEvaluation } from './prepare-evaluation.ts';
import { ERROR, RETURN } from './symbols.ts';
import type { EvaluatorState } from './types.ts';
const validateStatement = (
statement: StatementMessage,
): { earlyResult?: ResultMessage | null } => {
if (statement instanceof CommentMessage) {
// Comments are not evaluated.
return { earlyResult: null };
}
if (statement instanceof ImportMessage) {
// Imports are not implemented yet.
return {
earlyResult: new ResultMessage({
[ERROR]: new SyntaxError('Additional imports are not allowed.'),
}),
};
}
Iif (!(statement instanceof EvaluationMessage)) {
// This should never happen.
throw new Error(
[
'Internal: Unknown statement',
`statement: ${statement.messageBody.node.text}`,
`type: ${statement.messageBody.node.toString()}`,
].join('\n'),
);
}
// Otherwise, proceed with the evaluation.
return {};
};
export const makeEvaluator = ({
capabilities = {},
logger,
// For testing purposes.
initState = () => ({ consts: {}, lets: {} }),
}: {
capabilities?: CapabilityRecord;
logger?: Logger;
initState?: () => EvaluatorState;
}) => {
const state: EvaluatorState = initState();
return async (
history: ReplTranscript,
statement: StatementMessage,
): Promise<ResultMessage | null> => {
// Validate the statement.
const validation = validateStatement(statement);
if ('earlyResult' in validation) {
const { earlyResult } = validation;
history.push(statement, ...(earlyResult ? [earlyResult] : []));
return earlyResult;
}
// Prepare the evaluation.
const { code, endowments, result, commit } = prepareEvaluation(
state,
statement.messageBody.node,
ifDefined({ logger }),
);
logger?.info('capabilities:', capabilities);
logger?.info('endowments:', endowments);
logger?.info('evaluating:', code);
// Prepare the compartment.
const compartmentEndowments = mergeDisjointRecords(
endowments,
extractCapabilities(capabilities),
);
const compartment = makeCompartment(compartmentEndowments);
try {
await compartment.evaluate(code);
} catch (cause) {
const asError = (error: unknown): Error =>
error instanceof Error ? error : new Error(String(error));
// Errors that evade $catch are always an EvaluationError
throw new EvaluatorError(
'REPL evaluation failed',
code,
// If the error is already an EvaluatorError, we rethrow with the code,
cause instanceof EvaluatorError
? (cause.cause as Error)
: // Otherwise, wrap the error as EvaluatorError
asError(cause),
);
}
// Handle errors caught by $catch (user code errors)
processEvaluationError(result, code);
// Update the state and return the result
const stepResult = [ERROR, RETURN, 'value'].some((key) =>
Object.hasOwn(result, key),
)
? new ResultMessage(result)
: null;
history.push(statement, ...(stepResult ? [stepResult] : []));
commit();
return stepResult;
};
};
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