# -*- coding: utf-8 -*-

from vsg.token import block_statement as token
from vsg.vhdlFile import utils
from vsg.vhdlFile.classify import (
    block_declarative_part,
    block_header,
    block_statement_part,
)


def detect(iToken, lObjects):
    """
    block_statement ::=
    block_label :
        block [ ( *guard*_condition ) ] [ is ]
            block_header
            block_declarative_part
        begin
            block_statement_part
        end block [ block_label ] ;
    """

    if utils.are_next_consecutive_tokens([None, ":", "block"], iToken, lObjects):
        return classify(iToken, lObjects)
    return iToken


def classify(iToken, lObjects):
    iCurrent = utils.tokenize_label(iToken, lObjects, token.block_label, token.label_colon)
    iCurrent = utils.assign_next_token_required("block", token.block_keyword, iCurrent, lObjects)

    if utils.is_next_token("(", iCurrent, lObjects):
        iCurrent = utils.assign_next_token_required("(", token.guard_open_parenthesis, iCurrent, lObjects)
        iCurrent = utils.assign_next_token_if_not(")", token.guard_condition, iCurrent, lObjects)
        iCurrent = utils.assign_next_token_required(")", token.guard_close_parenthesis, iCurrent, lObjects)

    iCurrent = utils.assign_next_token_if("is", token.is_keyword, iCurrent, lObjects)

    iCurrent = block_header.detect(iCurrent, lObjects)

    iCurrent = block_declarative_part.detect(iCurrent, lObjects)

    iCurrent = utils.assign_next_token_required("begin", token.begin_keyword, iCurrent, lObjects)

    iCurrent = block_statement_part.detect(iCurrent, lObjects)

    iCurrent = utils.assign_next_token_required("end", token.end_keyword, iCurrent, lObjects)
    iCurrent = utils.assign_next_token_required("block", token.end_block_keyword, iCurrent, lObjects)
    iCurrent = utils.assign_next_token_if_not(";", token.end_block_label, iCurrent, lObjects)
    iCurrent = utils.assign_next_token_required(";", token.semicolon, iCurrent, lObjects)

    return iCurrent
