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Commit 1fc8788d authored by eckhart's avatar eckhart
Browse files

- further cleanups

parent faa86362
Hide whitespace changes
Inline Side-by-side
DHParser/parser.py
View file @ 1fc8788d
......@@ -661,10 +661,10 @@ class Grammar:
grammar class!
Attention: If there exists more than one reference to the same
parser, only the first one will be chosen for python versions
parser, only the first one will be chosen for python versions
greater or equal 3.6. For python version <= 3.5 an arbitrarily
selected reference will be chosen. See PEP 520
(www.python.org/dev/peps/pep-0520/) for an explanation of why.
(www.python.org/dev/peps/pep-0520/) for an explanation of why.
"""
if cls.parser_initialization__ != "done":
cdict = cls.__dict__
......@@ -677,7 +677,7 @@ class Grammar:
cls.parser_initialization__ = "done"
def __init__(self, root: Parser=None) -> None:
def __init__(self, root: Parser = None) -> None:
# if not hasattr(self.__class__, 'parser_initialization__'):
# self.__class__.parser_initialization__ = "pending"
# if not hasattr(self.__class__, 'wspL__'):
......@@ -891,7 +891,7 @@ class Grammar:
def log_parsing_history__(self, log_file_name: str = '') -> None:
"""
Writes a log of the parsing history of the most recently parsed
document.
document.
"""
def prepare_line(record):
excerpt = self.document__.text.__getitem__(record.extent)[:25].replace('\n', '\\n')
......@@ -936,8 +936,8 @@ def dsl_error_msg(parser: Parser, error_str: str) -> str:
that this is not necessarily the parser that caused the
error but only where the error became apparent.
error_str (str): A short string describing the error.
Returns:
str: An error message including the call stack if history
Returns:
str: An error message including the call stack if history
tacking has been turned in the grammar object.
"""
msg = ["DSL parser specification error:", error_str, 'Caught by parser "%s".' % str(parser)]
......@@ -983,7 +983,7 @@ def nil_preprocessor(text: str) -> str:
class PreprocessorToken(Parser):
"""
Parses tokens that have been inserted by a preprocessor.
Preprocessors can generate Tokens with the ``make_token``-function.
These tokens start and end with magic characters that can only be
matched by the PreprocessorToken Parser. Such tokens can be used to
......@@ -1023,8 +1023,9 @@ class PreprocessorToken(Parser):
class RegExp(Parser):
"""Regular expression parser.
r"""
Regular expression parser.
The RegExp-parser parses text that matches a regular expression.
RegExp can also be considered as the "atomic parser", because all
other parsers delegate part of the parsing job to other parsers,
......@@ -1068,13 +1069,13 @@ class Whitespace(RegExp):
class RE(Parser):
"""
r"""
Regular Expressions with optional leading or trailing whitespace.
The RE-parser parses pieces of text that match a given regular
expression. Other than the ``RegExp``-Parser it can also skip
"implicit whitespace" before or after the matched text.
The whitespace is in turn defined by a regular expression. It should
be made sure that this expression also matches the empty string,
e.g. use r'\s*' or r'[\t ]+', but not r'\s+'. If the respective
......@@ -1096,17 +1097,18 @@ class RE(Parser):
EBNF-Notation: `/ ... /~` or `~/ ... /` or `~/ ... /~`
EBNF-Example: `word = /\w+/~`
"""
def __init__(self, regexp, wL=None, wR=None, name=''):
"""Constructor for class RE.
Args:
regexp (str or regex object): The regular expression to be
used for parsing.
wL (str or regexp): Left whitespace regular expression,
used for parsing.
wL (str or regexp): Left whitespace regular expression,
i.e. either ``None``, the empty string or a regular
expression (e.g. "\s*") that defines whitespace. An
expression (e.g. "\s*") that defines whitespace. An
empty string means no whitespace will be skipped,
``None`` means that the default whitespace will be
``None`` means that the default whitespace will be
used.
wR (str or regexp): Right whitespace regular expression.
See above.
......@@ -1248,7 +1250,7 @@ class NaryOperator(Parser):
class Option(UnaryOperator):
"""
r"""
Parser `Optional` always matches, even if its child-parser
did not match.
......@@ -1328,7 +1330,7 @@ class ZeroOrMore(Option):
class OneOrMore(UnaryOperator):
"""
r"""
`OneOrMore` applies a parser repeatedly as long as this parser
matches. Other than `ZeroOrMore` which always matches, at least
one match is required by `OneOrMore`.
......@@ -1372,7 +1374,7 @@ class OneOrMore(UnaryOperator):
class Series(NaryOperator):
"""
r"""
Matches if each of a series of parsers matches exactly in the order of
the series.
......@@ -1394,7 +1396,8 @@ class Series(NaryOperator):
L = len(self.parsers)
assert 1 <= L < Series.NOPE, ('Length %i of series exceeds maximum length of %i'
% (L, Series.NOPE))
if mandatory < 0: mandatory += L
if mandatory < 0:
mandatory += L
assert 0 <= mandatory < L or mandatory == Series.NOPE
self.mandatory = mandatory
......
DHParser/syntaxtree.py
View file @ 1fc8788d
......@@ -80,7 +80,7 @@ class ParserBase:
def repr(self) -> str:
"""Returns the parser's name if it has a name and the parser's
`ptype` otherwise. Note that for named parsers this is not the
same as `repr(parsers)` which always returns the comined name
same as `repr(parsers)` which always returns the comined name
and ptype, e.g. 'term:OneOrMore'."""
return self.name if self.name else repr(self)
......@@ -88,7 +88,7 @@ class ParserBase:
"""Resets any parser variables. (Should be overridden.)"""
pass
def grammar(self):
def grammar(self) -> Optional['Grammar']:
"""Returns the Grammar object to which the parser belongs. If not
yet connected to any Grammar object, None is returned."""
return None
......@@ -341,7 +341,9 @@ class Node(collections.abc.Sized):
@property
def pos(self) -> int:
assert self._pos >= 0, "position value not initialized!"
"""Returns the position of the Node's content in the source text."""
if self._pos < 0:
raise AssertionError("position value not initialized!")
return self._pos
@pos.setter
......@@ -359,10 +361,24 @@ class Node(collections.abc.Sized):
@property
def errors(self) -> List[Error]:
"""
Returns the errors that occured at this Node,
not including any errors from child nodes.
"""
return self._errors.copy()
def add_error(self, message: str, level: int = Error.ERROR, code: Hashable = 0) -> 'Node':
def add_error(self,
message: str,
level: int = Error.ERROR,
code: Hashable = cast(Hashable, 0)) -> 'Node':
"""
Adds an error to this Node.
Parameters:
message(str): A string with the error message.abs
level(int): The error level (error or warning)
code(Hashable): An error code to identify the kind of error
"""
self._errors.append(Error(message, level, code))
self.error_flag = max(self.error_flag, self._errors[-1].level)
return self
......@@ -382,7 +398,7 @@ class Node(collections.abc.Sized):
else:
return []
def _collect_errors(self, lbreaks: List[int]=[], clear_errors=False) -> List[Error]:
def _collect_errors(self, lbreaks: List[int] = [], clear_errors=False) -> List[Error]:
if self.error_flag:
errors = self.errors
if lbreaks:
......@@ -400,7 +416,7 @@ class Node(collections.abc.Sized):
return []
def _tree_repr(self, tab, openF, closeF, dataF=identity, density=0) -> str:
def _tree_repr(self, tab, open_fn, close_fn, data_fn=identity, density=0) -> str:
"""
Generates a tree representation of this node and its children
in string from.
......@@ -422,31 +438,31 @@ class Node(collections.abc.Sized):
A string that contains a (serialized) tree representation
of the node and its children.
"""
head = openF(self)
tail = closeF(self)
head = open_fn(self)
tail = close_fn(self)
if not self.result:
return head.rstrip() + tail.lstrip()
D = None if density & 2 else ''
tail = tail.lstrip(None if density & 2 else '')
if self.children:
content = []
for child in self.children:
subtree = child._tree_repr(tab, openF, closeF, dataF, density).split('\n')
subtree = child._tree_repr(tab, open_fn, close_fn, data_fn, density).split('\n')
content.append('\n'.join((tab + s) for s in subtree))
return head + '\n'.join(content) + tail.lstrip(D)
return head + '\n'.join(content) + tail
res = cast(str, self.result) # safe, because if there are no children, result is a string
if density & 1 and res.find('\n') < 0: # and head[0] == "<":
# except for XML, add a gap between opening statement and content
gap = ' ' if head.rstrip()[-1] != '>' else ''
return head.rstrip() + gap + dataF(self.result) + tail.lstrip()
return head.rstrip() + gap + data_fn(self.result) + tail.lstrip()
else:
return head + '\n'.join([tab + dataF(s) for s in res.split('\n')]) + tail.lstrip(D)
return head + '\n'.join([tab + data_fn(s) for s in res.split('\n')]) + tail
def as_sxpr(self, src: str=None, compact: bool=False) -> str:
def as_sxpr(self, src: str = None, compact: bool = False) -> str:
"""
Returns content as S-expression, i.e. in lisp-like form.
......@@ -459,27 +475,33 @@ class Node(collections.abc.Sized):
tree structure.
"""
lB, rB, D = ('', '', 1) if compact else ('(', '\n)', 0)
left_bracket, right_bracket, density = ('', '', 1) if compact else ('(', '\n)', 0)
def opening(node) -> str:
s = lB + node.tag_name
"""Returns the opening string for the representation of `node`."""
txt = left_bracket + node.tag_name
# s += " '(pos %i)" % node.pos
if src:
s += " '(pos %i " % node.pos # + " %i %i)" % line_col(src, node.pos)
txt += " '(pos %i " % node.pos # + " %i %i)" % line_col(src, node.pos)
if node.errors:
s += " '(err '(%s))" % ' '.join(str(err).replace('"', r'\"')
for err in node.errors)
return s + '\n'
txt += " '(err '(%s))" % ' '.join(str(err).replace('"', r'\"')
for err in node.errors)
return txt + '\n'
def pretty(s):
return '"%s"' % s if s.find('"') < 0 \
else "'%s'" % s if s.find("'") < 0 \
else '"%s"' % s.replace('"', r'\"')
def closing(node) -> str:
"""Returns the closing string for the representation of `node`."""
return right_bracket
return self._tree_repr(' ', opening, lambda node: rB, pretty, density=D)
def pretty(strg):
"""Encloses `strg` with the right kind of quotation marks."""
return '"%s"' % strg if strg.find('"') < 0 \
else "'%s'" % strg if strg.find("'") < 0 \
else '"%s"' % strg.replace('"', r'\"')
return self._tree_repr(' ', opening, closing, pretty, density=density)
def as_xml(self, src: str=None) -> str:
def as_xml(self, src: str = None) -> str:
"""
Returns content as XML-tree.
......@@ -490,23 +512,27 @@ class Node(collections.abc.Sized):
"""
def opening(node) -> str:
s = '<' + node.tag_name
"""Returns the opening string for the representation of `node`."""
txt = '<' + node.tag_name
# s += ' pos="%i"' % node.pos
if src:
s += ' line="%i" col="%i"' % line_col(src, node.pos)
txt += ' line="%i" col="%i"' % line_col(src, node.pos)
if node.errors:
s += ' err="%s"' % ''.join(str(err).replace('"', r'\"') for err in node.errors)
return s + ">\n"
txt += ' err="%s"' % ''.join(str(err).replace('"', r'\"') for err in node.errors)
return txt + ">\n"
def closing(node):
"""Returns the closing string for the representation of `node`."""
return '\n</' + node.tag_name + '>'
return self._tree_repr(' ', opening, closing, density=1)
def structure(self) -> str:
"""Return structure (and content) as S-expression on a single line
without any line breaks."""
"""
Return structure (and content) as S-expression on a single line
without any line breaks.
"""
return flatten_sxpr(self.as_sxpr())
......@@ -522,33 +548,39 @@ class Node(collections.abc.Sized):
def find(self, match_function: Callable) -> Iterator['Node']:
"""Finds nodes in the tree that match a specific criterion.
"""
Finds nodes in the tree that match a specific criterion.
``find`` is a generator that yields all nodes for which the
given ``match_function`` evaluates to True. The tree is
given ``match_function`` evaluates to True. The tree is
traversed pre-order.
Args:
match_function (function): A function that takes as Node
object as argument and returns True or False
Yields:
Node: all nodes of the tree for which
Node: all nodes of the tree for which
``match_function(node)`` returns True
"""
if match_function(self):
yield self
else:
for child in self.children:
for nd in child.find(match_function):
yield nd
for node in child.find(match_function):
yield node
def tree_size(self) -> int:
"""Recursively counts the number of nodes in the tree including the root node."""
"""
Recursively counts the number of nodes in the tree including the root node.
"""
return sum(child.tree_size() for child in self.children) + 1
def log(self, log_file_name):
"""
Writes ab S-expressions of the tree with root `self` to a file.
"""
if is_logging():
path = os.path.join(log_dir(), log_file_name)
if os.path.exists(path):
......@@ -567,9 +599,13 @@ def mock_syntax_tree(sxpr):
"""
def next_block(s):
"""Generator that yields all characters until the next closing bracket
that does not match an opening bracket matched earlier within the same
package."""
s = s.strip()
while s[0] != ')':
if s[0] != '(': raise ValueError('"(" expected, not ' + s[:10])
if s[0] != '(':
raise ValueError('"(" expected, not ' + s[:10])
# assert s[0] == '(', s
level = 1
k = 1
......@@ -583,28 +619,29 @@ def mock_syntax_tree(sxpr):
s = s[k:].strip()
sxpr = sxpr.strip()
if sxpr[0] != '(': raise ValueError('"(" expected, not ' + sxpr[:10])
if sxpr[0] != '(':
raise ValueError('"(" expected, not ' + sxpr[:10])
# assert sxpr[0] == '(', sxpr
sxpr = sxpr[1:].strip()
m = re.match('[\w:]+', sxpr)
name, class_name = (sxpr[:m.end()].split(':') + [''])[:2]
sxpr = sxpr[m.end():].strip()
match = re.match(r'[\w:]+', sxpr)
name, class_name = (sxpr[:match.end()].split(':') + [''])[:2]
sxpr = sxpr[match.end():].strip()
if sxpr[0] == '(':
result = tuple(mock_syntax_tree(block) for block in next_block(sxpr))
else:
lines = []
while sxpr and sxpr[0] != ')':
for qm in ['"""', "'''", '"', "'"]:
m = re.match(qm + r'.*?' + qm, sxpr, re.DOTALL)
if m:
i = len(qm)
lines.append(sxpr[i:m.end() - i])
sxpr = sxpr[m.end():].strip()
for qtmark in ['"""', "'''", '"', "'"]:
match = re.match(qtmark + r'.*?' + qtmark, sxpr, re.DOTALL)
if match:
i = len(qtmark)
lines.append(sxpr[i:match.end() - i])
sxpr = sxpr[match.end():].strip()
break
else:
m = re.match(r'(?:(?!\)).)*', sxpr, re.DOTALL)
lines.append(sxpr[:m.end()])
sxpr = sxpr[m.end():]
match = re.match(r'(?:(?!\)).)*', sxpr, re.DOTALL)
lines.append(sxpr[:match.end()])
sxpr = sxpr[match.end():]
result = "\n".join(lines)
return Node(MockParser(name, ':' + class_name), result)
......
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