"""
line_len - checker for vxnorm

This file does not expose an explicite VxChecker object declaration to avoid
dependencies handling, you just need to provide:
    ======================= ===============================================
    parse_file()            Parse the source file
    ======================= ===============================================
"""

#---
# Public
#---

def parse_file(checker, mfile, _):
    """ parse the mapped file

    The file is mapped using mmap() and seeked through offset 0 to avoid too
    many I/O operations with classical file primitive.

    @args
    > checker (VxChecker) - current checker instance for this file
    > mfile        (mmap) - mmap instance of the file, seeked at 0
    > pathname      (str) - file pathname

    @return
    > Nothing
    """
    counter = 0
    checker.select_rule('linelen')
    for line in mfile.getlines():
        counter += 1
        if len(line) <= 80 or line[0] == '#':
            continue
        checker.notify(f"{counter}", f"too long line ({len(line)}/80)")