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DEFINITION MODULE Parser;
FROM Common IMPORT Identifier, PIdentifier, ShortString;
FROM Lexer IMPORT PLexer;
TYPE
Parser = RECORD
lexer: PLexer
END;
PParser = POINTER TO Parser;
AstLiteralKind = (
astLiteralKindInteger,
astLiteralKindString,
astLiteralKindNull,
astLiteralKindBoolean
);
AstLiteral = RECORD
CASE kind: AstLiteralKind OF
astLiteralKindInteger: integer: INTEGER |
astLiteralKindString: string: ShortString |
astLiteralKindNull: |
astLiteralKindBoolean: boolean: BOOLEAN
END
END;
PAstLiteral = POINTER TO AstLiteral;
AstUnaryOperator = (
astUnaryOperatorReference,
astUnaryOperatorNot,
astUnaryOperatorMinus
);
AstBinaryOperator = (
astBinaryOperatorSum,
astBinaryOperatorSubtraction,
astBinaryOperatorMultiplication,
astBinaryOperatorDivision,
astBinaryOperatorRemainder,
astBinaryOperatorEquals,
astBinaryOperatorNotEquals,
astBinaryOperatorLess,
astBinaryOperatorGreater,
astBinaryOperatorLessEqual,
astBinaryOperatorGreaterEqual,
astBinaryOperatorDisjunction,
astBinaryOperatorConjunction,
astBinaryOperatorExclusiveDisjunction,
astBinaryOperatorShiftLeft,
astBinaryOperatorShiftRight
);
AstExpressionKind = (
astExpressionKindLiteral,
astExpressionKindIdentifier,
astExpressionKindArrayAccess,
astExpressionKindDereference,
astExpressionKindFieldAccess,
astExpressionKindUnary,
astExpressionKindBinary,
astExpressionKindCall
);
AstExpression = RECORD
CASE kind: AstExpressionKind OF
astExpressionKindLiteral: literal: PAstLiteral |
astExpressionKindIdentifier: identifier: Identifier |
astExpressionKindDereference: reference: PAstExpression |
astExpressionKindArrayAccess:
array: PAstExpression;
index: PAstExpression |
astExpressionKindFieldAccess:
aggregate: PAstExpression;
field: Identifier |
astExpressionKindUnary:
unary_operator: AstUnaryOperator;
unary_operand: PAstExpression |
astExpressionKindBinary:
binary_operator: AstBinaryOperator;
lhs: PAstExpression;
rhs: PAstExpression |
astExpressionKindCall:
callable: PAstExpression;
argument_count: CARDINAL;
arguments: PPAstExpression
END
END;
PAstExpression = POINTER TO AstExpression;
PPAstExpression = POINTER TO PAstExpression;
AstStatementKind = (
astStatementKindIf,
astStatementKindWhile,
astStatementKindAssignment,
astStatementKindReturn,
astStatementKindCall
);
AstStatement = RECORD
CASE kind: AstStatementKind OF
astStatementKindIf:
if_condition: PAstExpression;
if_branch: AstCompoundStatement |
astStatementKindWhile:
while_condition: PAstExpression;
while_body: AstCompoundStatement |
astStatementKindAssignment:
assignee: PAstExpression;
assignment: PAstExpression |
astStatementKindReturn: returned: PAstExpression |
astStatementKindCall: call: PAstExpression
END
END;
PAstStatement = POINTER TO AstStatement;
PPAstStatement = POINTER TO PAstStatement;
AstCompoundStatement = RECORD
count: CARDINAL;
statements: PPAstStatement
END;
AstImportStatement = RECORD
package: Identifier;
symbols: PIdentifier
END;
PAstImportStatement = POINTER TO AstImportStatement;
PPAstImportStatement = POINTER TO PAstImportStatement;
AstConstantDeclaration = RECORD
constant_name: Identifier;
constant_value: INTEGER
END;
PAstConstantDeclaration = POINTER TO AstConstantDeclaration;
PPAstConstantDeclaration = POINTER TO PAstConstantDeclaration;
AstFieldDeclaration = RECORD
field_name: Identifier;
field_type: PAstTypeExpression
END;
PAstFieldDeclaration = POINTER TO AstFieldDeclaration;
AstTypeExpressionKind = (
astTypeExpressionKindNamed,
astTypeExpressionKindRecord,
astTypeExpressionKindEnumeration,
astTypeExpressionKindArray,
astTypeExpressionKindPointer,
astTypeExpressionKindProcedure
);
AstTypeExpression = RECORD
CASE kind: AstTypeExpressionKind OF
astTypeExpressionKindNamed: name: Identifier |
astTypeExpressionKindEnumeration: cases: PIdentifier |
astTypeExpressionKindPointer: target: PAstTypeExpression |
astTypeExpressionKindRecord: fields: PAstFieldDeclaration |
astTypeExpressionKindArray:
base: PAstTypeExpression;
length: CARDINAL |
astTypeExpressionKindProcedure: parameters: PPAstTypeExpression
END
END;
PAstTypeExpression = POINTER TO AstTypeExpression;
PPAstTypeExpression = POINTER TO PAstTypeExpression;
AstTypedDeclaration = RECORD
identifier: Identifier;
type_expression: PAstTypeExpression
END;
PAstTypedDeclaration = POINTER TO AstTypedDeclaration;
PPAstTypedDeclaration = POINTER TO PAstTypedDeclaration;
AstVariableDeclaration = RECORD
variable_name: Identifier;
variable_type: PAstTypeExpression
END;
PAstVariableDeclaration = POINTER TO AstVariableDeclaration;
PPAstVariableDeclaration = POINTER TO PAstVariableDeclaration;
AstProcedureDeclaration = RECORD
name: Identifier;
parameter_count: CARDINAL;
parameters: PAstTypedDeclaration;
return_type: PAstTypeExpression;
constants: PPAstConstantDeclaration;
variables: PPAstVariableDeclaration;
statements: AstCompoundStatement
END;
PAstProcedureDeclaration = POINTER TO AstProcedureDeclaration;
PPAstProcedureDeclaration = POINTER TO PAstProcedureDeclaration;
AstModule = RECORD
main: BOOLEAN;
imports: PPAstImportStatement;
constants: PPAstConstantDeclaration;
types: PPAstTypedDeclaration;
variables: PPAstVariableDeclaration;
procedures: PPAstProcedureDeclaration;
statements: AstCompoundStatement
END;
PAstModule = POINTER TO AstModule;
PROCEDURE parse(lexer: PLexer): PAstModule;
END Parser.
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