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"""
Module containing Fortran2008 Loop_Control rule R818
"""
from fparser.two.Fortran2003 import Loop_Control as Loop_Control_2003, Forall_Header
[docs]
class Loop_Control(Loop_Control_2003): # R818
"""Fortran 2008 rule R818
loop-control is [ , ] do-variable = scalar-int-expr , scalar-int-expr
[ , scalar-int-expr ]
or [ , ] WHILE ( scalar-logical-expr )
or [ , ] CONCURRENT forall-header
Extends the Fortran2003 rule R830 with the additional CONCURRENT clause.
The F2003 Loop_Control class would be better and more extensible
if it called 2 classes, one for each of the above
expressions. This would then affect the implementation of this
class. Something like the suggestion below. However, this would
result in a different fparser tree, see issue #416.
F2003 - While_Loop_Cntl: scalar-logical-expression, delim
F2003 - Counter_Loop_Cntl: var, lower, upper, [step], delim
F2008 - Concurrent_Loop_Cntl: conc_expr, delim
F2018 - Concurrent_Loop_Cntl: conc_expr, local_x, delim
"""
# This class' match method makes use of the Fortran2003 match
# method so 'use_names' should include any classes used within
# there as well as any used here.
[docs]
use_names = Loop_Control_2003.use_names[:]
use_names.append("Forall_Header")
@staticmethod
[docs]
def match(string):
"""Attempts to match the supplied text with this rule.
:param str string: Fortran code to check for a match.
:returns: None if there is no match, a tuple with the first \
entry providing the result of matching the 'WHILE' part of \
the rule if there is a match, the second entry providing \
the result of matching the 'COUNTER' part of the rule if \
there is a match, the third entry indicating whether \
there is an optional preceding ',' and the fourth entry \
providing the result of matching the 'CONCURRENT' part of \
the rule if there is a match.
:rtype: Optional[Tuple[ \
Optional[ \
:py:class:`fparser.two.Fortran2003.Scalar_Logical_Expr`], \
Optional[Tuple[ \
:py:class:`fparser.two.Fortran2003.Do_Variable`, List[str]]], \
Optional[str], \
Optional[:py:class:`fparser.two.Fortran2003.Forall_Header`]]]
"""
# Fortran2003 matches all but CONCURRENT so try this first
result = Loop_Control_2003.match(string)
if result:
return result + (None,)
# Try to match with CONCURRENT
line = string.lstrip()
optional_delim = None
if line.startswith(","):
line = line[1:].lstrip()
optional_delim = ","
if line[:10].upper() != "CONCURRENT":
return None
return (None, None, optional_delim, Forall_Header(line[10:].lstrip().rstrip()))
[docs]
def tostr(self):
"""
:returns: the Fortran representation of this object.
:rtype: str
"""
if self.items[0] or self.items[1]:
# Use the F2003 tostr() implementation
return Loop_Control_2003.tostr(self)
# Return loop control construct containing "CONCURRENT" clause
loopctrl = f"CONCURRENT {self.items[3]}"
# Add optional delimiter to loop control construct if present
if self.items[2]:
loopctrl = f"{self.items[2]} {loopctrl}"
return loopctrl