Function CheckConditional

src/bin/pgbench/pgbench.c:5102–5146

* Partial evaluation of conditionals before recording and running the script. */

 * Partial evaluation of conditionals before recording and running the script.
 */
static void
CheckConditional(ParsedScript ps)
{
	/* statically check conditional structure */
	ConditionalStack cs = conditional_stack_create();
	int			i;

	for (i = 0; ps.commands[i] != NULL; i++)
	{
		Command    *cmd = ps.commands[i];

		if (cmd->type == META_COMMAND)
		{
			switch (cmd->meta)
			{
				case META_IF:
					conditional_stack_push(cs, IFSTATE_FALSE);
					break;
				case META_ELIF:
					if (conditional_stack_empty(cs))
						ConditionError(ps.desc, i + 1, "\\elif without matching \\if");
					if (conditional_stack_peek(cs) == IFSTATE_ELSE_FALSE)
						ConditionError(ps.desc, i + 1, "\\elif after \\else");
					break;
				case META_ELSE:
					if (conditional_stack_empty(cs))
						ConditionError(ps.desc, i + 1, "\\else without matching \\if");
					if (conditional_stack_peek(cs) == IFSTATE_ELSE_FALSE)
						ConditionError(ps.desc, i + 1, "\\else after \\else");
					conditional_stack_poke(cs, IFSTATE_ELSE_FALSE);
					break;
				case META_ENDIF:
					if (!conditional_stack_pop(cs))
						ConditionError(ps.desc, i + 1, "\\endif without matching \\if");
					break;
				default:
					/* ignore anything else... */
					break;
			}
		}
	}
	if (!conditional_stack_empty(cs))
		ConditionError(ps.desc, i + 1, "\\if without matching \\endif");
	conditional_stack_destroy(cs);
}

/*
 * Parse a script (either the contents of a file, or a built-in script)