[sql-hkr]

Closes #40

What changed

• Lexer: Added do keyword to Lexer.TOKEN_SPEC.
• AST: Added DoWhileStmt(body: Block, condition: ASTNode) node.
• Parser: Added parsing of do <block | stmt> while (<condition>); in Parser.parse_stmt.
• CodeGenerator:
  • Implemented code generation for DoWhileStmt with loop start (dowhile_start_*), condition (dowhile_cond_*), and end (dowhile_end_*) labels.
  • Pushed condition label to loop_continue_stack so continue correctly routes to condition evaluation.
  • Pushed end label to loop_end_stack so break cleanly exits the loop.
  • Evaluated condition with CPI R16, 0 and looped back with BRNE <start>.

How tested

• Added unit tests in tests/test_compiler.py:
  • test_compiler_do_while_basic: verify repeated execution while condition holds true.
  • test_compiler_do_while_false_condition_executes_once: verify body executes exactly once when initial condition is false.
  • test_compiler_do_while_break_and_continue: verify break exits the loop and continue jumps to condition evaluation.
  • test_compiler_do_while_single_statement: verify brace-less single statement do ... while (...);.
  • test_compiler_do_while_ast_and_lexer: verify tokenization and AST parsing into DoWhileStmt.
• uv run pytest: 307 passed (all tests passed).
• uv run ruff check src/tiny8/compiler.py tests/test_compiler.py: passed.
• uv run ruff format --check src/tiny8/compiler.py tests/test_compiler.py: passed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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