def if_stmt():
def process(parsed):
(((((_, cond), _), true_stmt), else_parsed), _) = parsed
if else_parsed:
(_, else_stmt) = else_parsed
else:
else_stmt = None
return ast.IfStmtAST(cond, true_stmt, else_stmt)
return (parse_keyword('if') + b_expr() + parse_keyword('then') +
cb.Lazy(stmt_list) +
cb.Option(parse_keyword('else') + cb.Lazy(stmt_list)) +
parse_keyword('end') ^ process)
def while_stmt():
def process(parsed):
((((_, cond), _), body), _) = parsed
return ast.WhileStmtAST(cond, body)
return (parse_keyword('while') + b_expr() + parse_keyword('do') +
cb.Lazy(stmt_list) + parse_keyword('end') ^ process)
def a_expr_group():
return (parse_keyword('(') + cb.Lazy(a_expr) + parse_keyword(')')
^ process_group)
def b_expr_not():
return (parse_keyword('not') + cb.Lazy(b_expr_term) ^
(lambda parsed: ast.NotExprAST(parsed[1])))