add naive record construction support

src/interpreter/denotable.ts

@@ -22,9 +22,14 @@ export type DenotableType =
   | 'real'
   | 'bool'
   | 'string'
+  | 'record'
   | 'bytearray'
-  | 'function'
-  | 'reference';
+  | 'function';
+
+export type DenotableRecord = {
+  length: number;
+  record: Array<Denotable>;
+};
 
 export type DenotableValue =
   | null
@@ -32,6 +37,7 @@ export type DenotableValue =
   | string
   | Uint8Array
   | DenotableFunction
+  | DenotableRecord
   | Identifier;
 
 export type Denotable = {

src/interpreter/interpreter.ts

@@ -2,13 +2,17 @@ import {
   type ContinuationExpression,
   type PrimitiveOperationExpression,
   type ApplicationExpression,
+  type RecordExpression,
   type Program,
   type Value,
+  type RecordExpressionTuple,
+  type SelectExpression,
 } from '@/parser';
-import { Environment, type Denotable } from '.';
+import { Environment, type Denotable, type DenotableRecord } from '.';
 import {
   BadArgumentError,
   InvalidStateError,
+  InvalidType,
   NotImplementedError,
   type TracingLogger,
 } from '@/utils';
@@ -112,6 +116,89 @@ const evaluatePrimitiveOperation = (
   );
 };
 
+export const evaluateRecordTuple = (
+  tuple: RecordExpressionTuple,
+  env: Environment,
+  logger: TracingLogger,
+): Denotable => {
+  const { value, accessPath } = tuple;
+  const record = evaluateValue(value, env, logger.createChild('evaluateValue'));
+  if (record.type === 'record') {
+    // TODO: Implement nested records at accessPath
+    logger.debug(JSON.stringify(accessPath, null, 2));
+    throw new NotImplementedError('Nested records are not yet supported');
+  }
+
+  return record;
+};
+
+export const evaluateRecordExpression = (
+  { record }: RecordExpression,
+  env: Environment,
+  logger: TracingLogger,
+): Denotable => {
+  const {
+    records,
+    address: { name: address },
+    body,
+  } = record;
+
+  const childEnv = env.createChild();
+  const recordTuple = records.map(record =>
+    evaluateRecordTuple(
+      record,
+      childEnv,
+      logger.createChild('evaluateRecordTuple'),
+    ),
+  );
+  const length = recordTuple.length;
+
+  childEnv.set(address, {
+    type: 'record',
+    value: { length, record: recordTuple },
+  });
+
+  return evaluteContinuationExpression(
+    body,
+    childEnv,
+    logger.createChild('evaluteContinuationExpression'),
+  );
+};
+
+export const evaluateSelectExpression = (
+  { select }: SelectExpression,
+  env: Environment,
+  logger: TracingLogger,
+): Denotable => {
+  const {
+    index: { int: index },
+    record,
+    bind,
+    continuation,
+  } = select;
+  const childEnv = env.createChild();
+
+  const recordValue = evaluateValue(
+    record,
+    env,
+    logger.createChild('evaluateValue'),
+  );
+  if (recordValue.type !== 'record') {
+    throw new InvalidType('Expected record type');
+  }
+
+  const { value } = recordValue as { value: DenotableRecord };
+
+  const selected = value.record[index];
+  childEnv.set(bind.name, selected);
+
+  return evaluteContinuationExpression(
+    continuation,
+    childEnv,
+    logger.createChild('evaluteContinuationExpression'),
+  );
+};
+
 const evaluteContinuationExpression = (
   expr: ContinuationExpression,
   env: Environment,
@@ -136,10 +223,20 @@ const evaluteContinuationExpression = (
   }
 
   if ('record' in expr) {
-    throw new NotImplementedError('Continuation records are not supported yet');
+    logger.debug('Evaluating record');
+    return evaluateRecordExpression(
+      expr,
+      env,
+      logger.createChild('evaluateRecordExpression'),
+    );
   }
   if ('select' in expr) {
-    throw new NotImplementedError('Continuation select is not supported yet');
+    logger.debug('Evaluating select');
+    return evaluateSelectExpression(
+      expr,
+      env,
+      logger.createChild('evaluateSelectExpression'),
+    );
   }
   if ('offset' in expr) {
     throw new NotImplementedError('Continuation offset is not supported yet');

src/parser/grammar.pegjs

@@ -17,11 +17,11 @@ SelectExpression
     _?
     LPAREN
     _?
-    record:Integer
+    index:Integer
     _?
     COMMA
     _?
-    val:Value
+    record:VarStatement
     _?
     COMMA
     _?
@@ -31,7 +31,7 @@ SelectExpression
     _?
     continuation:ContinuationExpression
     _?
-    RPAREN { return { select: { record, val, bind, continuation } }; }
+    RPAREN { return { select: { index, record, bind, continuation } }; }
 
 OffsetExpression
   = OFFSET
@@ -86,9 +86,17 @@ SwitchExpression
     RPAREN { return { switch: { switchIndex, continuations } }; }
 
 ApplicationExpression
-  = APP _? LPAREN _? fn:(LabelStatement / VarStatement) _? COMMA _? args:ValueList _? RPAREN {
-      return { application: { fn, args } };
-    }
+  = APP
+    _?
+    LPAREN
+    _?
+    fn:(LabelStatement / VarStatement)
+    _?
+    COMMA
+    _?
+    args:ValueList
+    _?
+    RPAREN { return { application: { fn, args } }; }
 
 FixBinding
   = LPAREN
@@ -169,16 +177,29 @@ PrimitiveOperationExpression
       };
     }
 
-RecordExpressionTuple
-  = LPAREN
+AccessPath
+  = OffsetPath
+  / SelectPath
+
+OffsetPath = OFFP _ offset:Integer { return { offset: offset.int }; }
+
+SelectPath
+  = SELP
     _?
-    value:Value
+    LPAREN
+    _?
+    index:Integer
     _?
     COMMA
     _?
-    offset:OffsetStatement
+    accessPath:AccessPath
     _?
-    RPAREN { return { value, offset }; }
+    RPAREN { return { select: { index, accessPath } }; }
+
+RecordExpressionTuple
+  = LPAREN _? value:Value _? COMMA _? accessPath:AccessPath _? RPAREN {
+      return { value, accessPath };
+    }
 
 RecordExpressionTupleList
   = LBRACKET
@@ -238,14 +259,6 @@ BoolStatement = BOOL _ bool:Integer { return { bool: bool.int }; }
 
 StringStatement = STRING _ string:QuotedString { return string; }
 
-AccessStatement
-  = OffsetStatement
-  / SelectStatement
-
-OffsetStatement = OFFP _ offset:Integer { return offset; }
-
-SelectStatement = SELP _ offset:Integer { return offset; }
-
 Identifier
   = name:([A-Za-z] (LETTER / DIGIT / SAFE_SYMBOL)*) {
       return { name: name[0] + name[1].join('') };
@@ -291,7 +304,8 @@ ComparisonOperation
   / "||"
   / "&&"
 
-Integer = digits:("-"? [0-9]+) !"." { return { int: parseInt(digits.join(''), 10) }; }
+Integer
+  = digits:("-"? [0-9]+) !"." { return { int: parseInt(digits.join(''), 10) }; }
 
 QuotedString
   = "'" content:[^']* "'" { return content.join(''); }
@@ -299,9 +313,11 @@ QuotedString
 
 Real
   = value:("-"? [0-9]+ ("." [0-9]+)?) {
-      return { real: parseFloat(
+      return {
+        real: parseFloat(
           value.map(x => (Array.isArray(x) ? x.join('') : x)).join(''),
-      ) };
+        ),
+      };
     }
 
 Literal

test/programs/record.cps

@@ -1,6 +1,6 @@
 RECORD([(INT 1, OFFp 0), (INT 2, OFFp 0)], record,
-  SELECT(0, VAR one, record,
-    SELECT(1, VAR two, record,
+  SELECT(0, VAR record, one,
+    SELECT(1, VAR record, two,
       PRIMOP(+, [VAR one, VAR two], [result], [])
     )
   )