CommandNode *parser_buildtree(List tokens, Diagnostic *diag)
{
ParserContext ctx = {NULL, NULL, NULL, NULL};
ParserState state = ST_COMMAND;
/* Open top-level subshell */
state = parser_process_token(&ctx, state, "(");
while (tokens != NULL && state != ST_ERROR)
{
state = parser_process_token(&ctx, state, list_head_str(tokens));
tokens = tokens->next;
}
/* Close top-level subshell */
if (state != ST_ERROR)
state = parser_process_token(&ctx, state, ")");
/* Check result status */
if (state != ST_ERROR && state != ST_REDIRECT_FILENAME &&
ctx.expr_stack == NULL &&
ctx.current_expr != NULL && ctx.current_expr->next==NULL)
{
/* success */
list_free(ctx.current_expr);
fix_arguments_order(ctx.current_command);
diag->error = 0;
return ctx.current_command;
}
else
{
/* failure */
List stack;
/* free all CommandNode entities */
free_command_list(ctx.current_expr);
stack = ctx.expr_stack;
while (stack != NULL)
{
free_command_list(list_head_list(stack));
stack = list_pop(stack);
}
diag->error = 1;
diag->error_message = "Syntax error";
return NULL;
}
}
static void fini(void *udata)
{
free_command_list();
}
