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__all__ = ['Statement','BeginStatement','EndStatement']
import re
import sys
from readfortran import Line
class Statement:
"""
Statement instance has attributes:
parent - Parent BeginStatement or FortranParser instance
item - Line instance containing the statement line
isvalid - boolean, when False, the Statement instance will be ignored
"""
modes = ['free90','fix90','fix77','pyf']
def __init__(self, parent, item):
self.parent = parent
self.reader = parent.reader
self.item = item
# when a statement instance is constructed by error, set isvalid to False
self.isvalid = True
# when a statement should be ignored, set ignore to True
self.ignore = False
self.process_item()
def get_indent_tab(self,colon=None,deindent=False):
if self.reader.isfix:
tab = ' '*6
else:
tab = ''
p = self.parent
while isinstance(p, Statement):
tab += ' '
p = p.parent
if deindent:
tab = tab[:-2]
if self.item is None:
return tab
s = self.item.label
if colon is None:
if self.reader.isfix:
colon = ''
else:
colon = ':'
if s:
c = ''
if self.reader.isfix:
c = ' '
tab = tab[len(c+s)+len(colon):]
if not tab: tab = ' '
tab = c + s + colon + tab
return tab
def show_message(self, message):
print >> sys.stderr, message
sys.stderr.flush()
return
class BeginStatement(Statement):
""" <blocktype> <name>
BeginStatement instances have additional attributes:
name
blocktype
Block instance has attributes:
content - list of Line or Statement instances
name - name of the block, unnamed blocks are named
with the line label
parent - Block or FortranParser instance
item - Line instance containing the block start statement
get_item, put_item - methods to retrive/submit Line instaces
from/to Fortran reader.
isvalid - boolean, when False, the Block instance will be ignored.
stmt_cls, end_stmt_cls
"""
def __init__(self, parent, item=None):
self.content = []
self.get_item = parent.get_item # get line function
self.put_item = parent.put_item # put line function
if not hasattr(self, 'blocktype'):
self.blocktype = self.__class__.__name__.lower()
if not hasattr(self, 'name'):
# process_item may change this
self.name = '__'+self.blocktype.upper()+'__'
Statement.__init__(self, parent, item)
return
def tostr(self):
return self.blocktype.upper() + ' '+ self.name
def __str__(self):
l=[self.get_indent_tab(colon=':') + self.tostr()]
for c in self.content:
l.append(str(c))
return '\n'.join(l)
def process_item(self):
""" Process the line
"""
item = self.item
if item is None: return
self.fill()
return
def fill(self, end_flag = False):
"""
Fills blocks content until the end of block statement.
"""
mode = self.reader.mode
classes = self.get_classes()
self.classes = [cls for cls in classes if mode in cls.modes]
self.pyf_classes = [cls for cls in classes if 'pyf' in cls.modes]
item = self.get_item()
while item is not None:
if isinstance(item, Line):
if self.process_subitem(item):
end_flag = True
break
item = self.get_item()
if not end_flag:
message = self.item.reader.format_message(\
'WARNING',
'failed to find the end of block for %s'\
% (self.__class__.__name__),
self.item.span[0],self.item.span[1])
self.show_message(message)
return
def process_subitem(self, item):
"""
Check is item is blocks start statement, if it is, read the block.
Return True to stop adding items to given block.
"""
line = item.get_line()
# First check for the end of block
cls = self.end_stmt_cls
if cls.match(line):
stmt = cls(self, item)
if stmt.isvalid:
self.content.append(stmt)
return True
if item.is_f2py_directive:
classes = self.pyf_classes
else:
classes = self.classes
# Look for statement match
for cls in classes:
if cls.match(line):
stmt = cls(self, item)
if stmt.isvalid:
if not stmt.ignore:
self.content.append(stmt)
return False
# item may be cloned that changes the items line:
line = item.get_line()
# Check if f77 code contains inline comments or other f90
# constructs that got undetected by get_source_info.
if item.reader.isfix77:
i = line.find('!')
if i != -1:
message = item.reader.format_message(\
'WARNING',
'no parse pattern found for "%s" in %r block'\
' maybe due to inline comment.'\
' Trying to remove the comment.'\
% (item.get_line(),self.__class__.__name__),
item.span[0], item.span[1])
# .. but at the expense of loosing the comment.
self.show_message(message)
newitem = item.copy(line[:i].rstrip())
return self.process_subitem(newitem)
# try fix90 statement classes
f77_classes = self.classes
classes = []
for cls in self.get_classes():
if 'fix90' in cls.modes and cls not in f77_classes:
classes.append(cls)
if classes:
message = item.reader.format_message(\
'WARNING',
'no parse pattern found for "%s" in %r block'\
' maybe due to strict f77 mode.'\
' Trying f90 fix mode patterns..'\
% (item.get_line(),self.__class__.__name__),
item.span[0], item.span[1])
self.show_message(message)
item.reader.set_mode(False, False)
self.classes = classes
r = BeginStatement.process_subitem(self, item)
if r is None:
# restore f77 fix mode
self.classes = f77_classes
item.reader.set_mode(False, True)
else:
message = item.reader.format_message(\
'INFORMATION',
'The f90 fix mode resolved the parse pattern issue.'\
' Setting reader to f90 fix mode.',
item.span[0], item.span[1])
self.show_message(message)
# set f90 fix mode
self.classes = f77_classes + classes
self.reader.set_mode(False, False)
return r
self.handle_unknown_item(item)
return
def handle_unknown_item(self, item):
message = item.reader.format_message(\
'WARNING',
'no parse pattern found for "%s" in %r block.'\
% (item.get_line(),self.__class__.__name__),
item.span[0], item.span[1])
self.show_message(message)
self.content.append(item)
#sys.exit()
return
class EndStatement(Statement):
"""
END [<blocktype> [<name>]]
EndStatement instances have additional attributes:
name
blocktype
"""
def __init__(self, parent, item):
if not hasattr(self, 'blocktype'):
self.blocktype = self.__class__.__name__.lower()[3:]
Statement.__init__(self, parent, item)
def process_item(self):
item = self.item
line = item.get_line().replace(' ','')[3:]
blocktype = self.blocktype
if line.startswith(blocktype):
line = line[len(blocktype):].strip()
else:
if line:
# not the end of expected block
line = ''
self.isvalid = False
if line:
if not line==self.parent.name:
message = item.reader.format_message(\
'WARNING',
'expected the end of %r block but got end of %r, skipping.'\
% (self.parent.name, line),
item.span[0],item.span[1])
self.show_message(message)
self.isvalid = False
self.name = self.parent.name
def __str__(self):
return self.get_indent_tab()[:-2] + 'END %s %s'\
% (self.blocktype.upper(),self.name or '')
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