Function CheckForNonStandardConstructs

tools/cpplint.py:3720–3943

r"""Logs an error if we see certain non-ANSI constructs ignored by gcc-2. Complain about several constructs which gcc-2 accepts, but which are not standard C++. Warning about these in lint is one way to ease the transition to new compilers. - put storage class first (e.g. "static c

(filename, clean_lines, linenum, nesting_state, error)

def CheckForNonStandardConstructs(filename, clean_lines, linenum, nesting_state, error):
    r"""Logs an error if we see certain non-ANSI constructs ignored by gcc-2.

    Complain about several constructs which gcc-2 accepts, but which are
    not standard C++.  Warning about these in lint is one way to ease the
    transition to new compilers.
    - put storage class first (e.g. "static const" instead of "const static").
    - "%lld" instead of %qd" in printf-type functions.
    - "%1$d" is non-standard in printf-type functions.
    - "\%" is an undefined character escape sequence.
    - text after #endif is not allowed.
    - invalid inner-style forward declaration.
    - >? and <? operators, and their >?= and <?= cousins.

    Additionally, check for constructor/destructor style violations and reference
    members, as it is very convenient to do so while checking for
    gcc-2 compliance.

    Args:
      filename: The name of the current file.
      clean_lines: A CleansedLines instance containing the file.
      linenum: The number of the line to check.
      nesting_state: A NestingState instance which maintains information about
                     the current stack of nested blocks being parsed.
      error: A callable to which errors are reported, which takes 4 arguments:
             filename, line number, error level, and message
    """

    # Remove comments from the line, but leave in strings for now.
    line = clean_lines.lines[linenum]

    if re.search(r'printf\s*\(.*".*%[-+ ]?\d*q', line):
        error(
            filename,
            linenum,
            "runtime/printf_format",
            3,
            "%q in format strings is deprecated.  Use %ll instead.",
        )

    if re.search(r'printf\s*\(.*".*%\d+\$', line):
        error(
            filename,
            linenum,
            "runtime/printf_format",
            2,
            "%N$ formats are unconventional.  Try rewriting to avoid them.",
        )

    # Remove escaped backslashes before looking for undefined escapes.
    line = line.replace("\\\\", "")

    if re.search(r'("|\').*\\(%|\[|\(|{)&#x27;, line):
        error(
            filename,
            linenum,
            "build/printf_format",
            3,