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"""
Module containing Fortran2008 Open_Stmt rule R904
"""
from fparser.two.Fortran2003 import Open_Stmt as Open_Stmt_2003
from fparser.two.utils import CALLBase
[docs]
class Open_Stmt(Open_Stmt_2003): # R904
"""
Fortran2008 Rule R904.
open-stmt is OPEN ( connect-spec-list )
"""
[docs]
use_names = ["Connect_Spec_List"]
@staticmethod
[docs]
def match(string):
"""
Attempts to match the supplied string as an Open_Stmt.
:param str string: the string to attempt to match.
:returns: a new Open_Stmt object if the match is successful, None otherwise.
:rtype: Optional[:py:class:`fparser.two.Fortran2008.Open_Stmt]
"""
# Avoid circular dependencies by importing here.
# pylint: disable=import-outside-toplevel
from fparser.two.Fortran2008 import Connect_Spec_List
obj = CALLBase.match("OPEN", Connect_Spec_List, string, require_rhs=True)
if not obj:
return None
# Apply constraints now that we have the full Connect_Spec_List.
have_unit = False
have_newunit = False
connect_specs = []
spec_list = obj[1].children
for spec in spec_list:
if spec.children[0] in connect_specs:
# C903 - no specifier can appear more than once.
return None
connect_specs.append(spec.children[0])
if spec.children[0] == "UNIT":
have_unit = True
elif spec.children[0] == "NEWUNIT":
have_newunit = True
if have_unit and have_newunit:
# C906 - cannot have both UNIT and NEWUNIT
return None
if not (have_unit or have_newunit):
# C904 - a file unit number must be specified.
return None
return obj