Spec #38.2: Implement 1D array declaration (DIM)

[treytomes]

Description

Parse and allocate 1-dimensional numeric arrays using DIM statement.

DIM explicitly declares an array with specified upper bound. Lower bound determined by OPTION BASE (default 0).

ECMA-55 References

• ECMA55-ARR-003: DIM statement syntax
• ECMA55-ARR-004: Array bounds based on BASE
• ECMA55-VAR-011: Array naming conventions

Acceptance Criteria

• Parse DIM A(n) for single-letter arrays
• Parse DIM A1(n) for letter+digit arrays
• With BASE 0: DIM A(10) creates 11 elements (indices 0-10)
• With BASE 1: DIM A(10) creates 10 elements (indices 1-10)
• Reject negative upper bounds
• Reject DIM A(0) when BASE is 1
• Reject duplicate DIM statements for same array
• Array names follow variable naming rules
• All tests pass
• Test coverage ≥ 80%

Parent Issue

Part of #38 - Implement DIM and OPTION BASE for array support

Estimated Effort

3-4 hours

Dependencies

Depends on Spec #38.1 (OPTION BASE)