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Add simple_parser dependency. Extend/test new funcparser

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This commit is contained in:
Griatch 2021-03-17 11:45:29 +01:00
parent 377a25f9e8
commit f445f34356
3 changed files with 319 additions and 223 deletions
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evennia/utils/funcparser.py
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@ -56,14 +56,18 @@ class ParsedFunc:
args: list = dataclasses.field(default_factory=list)
kwargs: dict = dataclasses.field(default_factory=dict)
# state storage
fullstr: str = ""
infuncstr: str = ""
single_quoted: bool = False
double_quoted: bool = False
current_kwarg: str = ""
def get(self):
return self.funcname[len(self.prefix):], self.args, self.kwargs
return self.funcname, self.args, self.kwargs
def __str__(self):
argstr = ", ".join(str(arg) for arg in self.args)
kwargstr = ", " + ", ".join(
f"{key}={val}" for key, val in self.kwargs.items()) if self.kwargs else ""
return f"{self.prefix}{self.funcname}({argstr}{kwargstr})"
return self.fullstr + self.infuncstr
class ParsingError(RuntimeError):
@ -84,7 +88,7 @@ class FuncParser:
start_char=_START_CHAR,
escape_char=_ESCAPE_CHAR,
max_nesting=_MAX_NESTING,
**kwargs):
**default_kwargs):
"""
Initialize the parser.
@ -104,15 +108,19 @@ class FuncParser:
them not count as a function. Default is `\\`.
max_nesting (int, optional): How many levels of nested function calls
are allowed, to avoid exploitation.
**kwargs: If given - these kwargs will always be passed to _every_
callable parsed and executed by this parser instance.
**default_kwargs: These kwargs will be passed into all callables. These
kwargs can be overridden both by kwargs passed direcetly to `.parse` _and_
by kwargs given directly in the string `$funcname` call. They are
suitable for global defaults that is intended to be changed by the
user. To _guarantee_ a call always gets a particular kwarg, pass it
into `.parse` as `**reserved_kwargs` instead.
"""
if isinstance(safe_callables, dict):
callables = {**safe_callables}
else:
# load all modules/paths in sequence. Later-added will override earlier
# same-named callables (allows for overriding evennia defaults)
# load all modules/paths in sequence. Later-added will override
# earlier same-named callables (allows for overriding evennia defaults)
callables = {}
for safe_callable in make_iter(safe_callables):
# callables_from_module handles both paths and module instances
@ -121,7 +129,7 @@ class FuncParser:
self.callables = callables
self.escape_char = escape_char
self.start_char = start_char
self.default_kwargs = kwargs
self.default_kwargs = default_kwargs
def validate_callables(self, callables):
"""
@ -145,7 +153,7 @@ class FuncParser:
assert mapping.varargs, f"Parse-func callable '{funcname}' does not support *args."
assert mapping.varkw, f"Parse-func callable '{funcname}' does not support **kwargs."
def execute(self, parsedfunc, raise_errors=False):
def execute(self, parsedfunc, raise_errors=False, **reserved_kwargs):
"""
Execute a parsed function
@ -154,15 +162,28 @@ class FuncParser:
of the function.
raise_errors (bool, optional): Raise errors. Otherwise return the
string with the function unparsed.
**reserved_kwargs: These kwargs are _guaranteed_ to always be passed into
the callable on every call. It will override any default kwargs
_and_ also a same-named kwarg given manually in the $funcname
call. This is often used by Evennia to pass required data into
the callable, for example the current Session for inlinefuncs.
Returns:
any: The result of the execution. If this is a nested function, it
can be anything, otherwise it will be converted to a string later.
Always a string on un-raised error (the unparsed function string).
Raises:
ParsingError, any: A `ParsingError` if the function could not be found, otherwise
error from function definition. Only raised if `raise_errors` is `True`
ParsingError, any: A `ParsingError` if the function could not be
found, otherwise error from function definition. Only raised if
`raise_errors` is `True`
Notes:
The kwargs passed into the callable will be a mixture of the
`default_kwargs` passed into `FuncParser.__init__`, kwargs given
directly in the `$funcdef` string, and the `reserved_kwargs` this
function gets from `.parse()`. For colliding keys, funcdef-defined
kwargs will override default kwargs while reserved kwargs will always
override the other two.
"""
funcname, args, kwargs = parsedfunc.get()
@ -175,6 +196,9 @@ class FuncParser:
f"(available: {available})")
return str(parsedfunc)
# build kwargs in the proper priority order
kwargs = {**self.default_kwargs, **kwargs, **reserved_kwargs}
try:
return str(func(*args, **kwargs))
except Exception:
@ -183,7 +207,7 @@ class FuncParser:
raise
return str(parsedfunc)
def parse(self, string, raise_errors=False, **kwargs):
def parse(self, string, raise_errors=False, **reserved_kwargs):
"""
Use parser to parse a string that may or may not have `$funcname(*args, **kwargs)`
- style tokens in it. Only the callables used to initiate the parser
@ -191,12 +215,16 @@ class FuncParser:
Args:
string (str): The string to parse.
raise_errors (bool, optional): By default, a failing parse just means not parsing the
string but leaving it as-is. If this is `True`, errors (like not closing brackets)
will lead to an ParsingError.
**kwargs: If given, these are extra options to pass as `**kwargs` into each
parsed callable. These will override any same-named kwargs given earlier
to `FuncParser.__init__`.
raise_errors (bool, optional): By default, a failing parse just
means not parsing the string but leaving it as-is. If this is
`True`, errors (like not closing brackets) will lead to an
ParsingError.
**reserved_kwargs: If given, these are guaranteed to _always_ pass
as part of each parsed callable's **kwargs. These override
same-named default options given in `__init__` as well as any
same-named kwarg given in the string function. This is because
it is often used by Evennia to pass necessary kwargs into each
callable (like the current Session object for inlinefuncs).
Returns:
str: The parsed string, or the same string on error (if `raise_errors` is `False`)
@ -205,224 +233,176 @@ class FuncParser:
ParsingError: If a problem is encountered and `raise_errors` is True.
"""
callables = self.callables
# prepare kwargs to pass into callables
callable_kwargs = {**self.default_kwargs}
callable_kwargs.update(kwargs)
start_char = self.start_char
escape_char = self.escape_char
# replace e.g. $$ with \$ so we only need to handle one escape method
string = string.replace(start_char + start_char, escape_char + start_char)
# parsing state
callstack = []
single_quoted = False
double_quoted = False
open_lparens = 0
escaped = False
current_kwarg = None
current_kwarg = ""
curr_func = None
fullstr = ''
workstr = ''
#from evennia import set_trace;set_trace()
fullstr = '' # final string
infuncstr = '' # string parts inside the current level of $funcdef (including $)
for char in string:
if escaped:
# always store escaped characters verbatim
workstr += char
if curr_func:
infuncstr += char
else:
fullstr += char
escaped = False
continue
if char == escape_char:
# don't store the escape-char itself
escaped = True
continue
if char == "'":
# a single quote - flip status
single_quoted = not single_quoted
continue
if char == '"':
# a double quote = flip status
double_quoted = not double_quoted
continue
if not (double_quoted or single_quoted):
# not in a string escape
if char == start_char:
# start a new function
if curr_func:
# nested func
if len(callstack) >= _MAX_NESTING:
# stack full - ignore this function
if raise_errors:
raise ParsingError("Only allows for parsing nesting function defs "
f"to a max depth of {_MAX_NESTING}.")
workstr += char
continue
else:
# store what we have and stack it
if current_kwarg:
curr_func.kwargs[current_kwarg] = workstr
current_kwarg = None
else:
curr_func.args.append(workstr)
workstr = ''
callstack.append(curr_func)
else:
# entering a funcdef, flush workstr
fullstr += workstr
workstr = char
# start a new func
curr_func = ParsedFunc(prefix=char)
continue
if char == start_char:
# start a new function definition (not escaped as $$)
if curr_func:
# currently parsing a func
if char == '(':
# end of a funcdef
curr_func.funcname = workstr
workstr = ''
# we are starting a nested funcdef
if len(callstack) > _MAX_NESTING:
# stack full - ignore this function
if raise_errors:
raise ParsingError("Only allows for parsing nesting function defs "
f"to a max depth of {_MAX_NESTING}.")
infuncstr += char
continue
if char == '=':
# beginning of a keyword argument
current_kwarg = workstr
curr_func.kwargs[current_kwarg] = None
workstr = ''
continue
if char in (',', ')'):
# end current arg/kwarg one way or another
if current_kwarg:
curr_func.kwargs[current_kwarg] = workstr
current_kwarg = None
else:
curr_func.args.append(workstr)
workstr = ''
else:
# store state for the current func and stack it
curr_func.current_kwarg = current_kwarg
curr_func.infuncstr = infuncstr
curr_func.open_lparens = open_lparens
curr_func.single_quoted = single_quoted
curr_func.double_quoted = double_quoted
current_kwarg = ""
infuncstr = ""
open_lparens = 0
single_quoted = False
double_quoted = False
callstack.append(curr_func)
if char == ')':
# closing the function list - this means we have a
# ready function def to run.
# start a new func
curr_func = ParsedFunc(prefix=char, fullstr=char)
continue
workstr += self.execute(curr_func, raise_errors=raise_errors)
if not curr_func:
# a normal piece of string
fullstr += char
continue
curr_func = None
if callstack:
# get a new func from stack, if any
curr_func = callstack.pop(0)
else:
fullstr += workstr
workstr = ''
continue
# in a function def (can be nested)
workstr += char
if char == "'": # note that this is the same as "\'"
# a single quote - flip status
single_quoted = not single_quoted
infuncstr += char
continue
fullstr += workstr
if char == '"': # note that this is the same as '\"'
# a double quote = flip status
double_quoted = not double_quoted
infuncstr += char
continue
if double_quoted or single_quoted:
# inside a string escape
infuncstr += char
continue
# special characters detected inside function def
if char == '(':
if not curr_func.funcname:
# end of a funcdef name
curr_func.funcname = infuncstr
curr_func.fullstr += infuncstr + char
infuncstr = ''
else:
# just a random left-parenthesis
infuncstr += char
# track the open left-parenthesis
open_lparens += 1
continue
if char == '=':
# beginning of a keyword argument
current_kwarg = infuncstr.strip()
curr_func.kwargs[current_kwarg] = ""
curr_func.fullstr += infuncstr + char
infuncstr = ''
continue
if char in (',', ')'):
# commas and right-parens may indicate arguments ending
if open_lparens > 1:
# inside an unclosed, nested ( - this is neither
# closing the function-def nor indicating a new arg
# at the funcdef level
infuncstr += char
open_lparens -= 1 if char == ')' else 0
continue
# end current arg/kwarg one way or another
if current_kwarg:
curr_func.kwargs[current_kwarg] = infuncstr.strip()
current_kwarg = ""
elif infuncstr.strip():
curr_func.args.append(infuncstr.strip())
# we need to store the full string so we can print it 'raw' in
# case this funcdef turns out to e.g. lack an ending paranthesis
curr_func.fullstr += infuncstr + char
infuncstr = ''
if char == ')':
# closing the function list - this means we have a
# ready function-def to run.
open_lparens = 0
infuncstr = self.execute(
curr_func, raise_errors=raise_errors, **reserved_kwargs)
curr_func = None
if callstack:
# unnest the higher-level funcdef from stack
# and continue where we were
curr_func = callstack.pop()
current_kwarg = curr_func.current_kwarg
infuncstr = curr_func.infuncstr + infuncstr
curr_func.infuncstr = ''
open_lparens = curr_func.open_lparens
single_quoted = curr_func.single_quoted
double_quoted = curr_func.double_quoted
else:
# back to the top-level string
curr_func = None
fullstr += infuncstr
infuncstr = ''
continue
# no special char
infuncstr += char
if curr_func:
# if there is a still open funcdef or defs remaining in callstack,
# these are malformed (no closing bracket) and we should get their
# strings as-is.
callstack.append(curr_func)
for _ in range(len(callstack)):
infuncstr = str(callstack.pop()) + infuncstr
# add the last bit to the finished string and return
fullstr += infuncstr
return fullstr
#def parse_arguments(s, **kwargs):
# """
# This method takes a string and parses it as if it were an argument list to a function.
# It supports both positional and named arguments.
#
# Values are automatically converted to int or float if possible.
# Values surrounded by single or double quotes are treated as strings.
# Any other value is wrapped in a "FunctionArgument" class for later processing.
#
# Args:
# s (str): The string to convert.
#
# Returns:
# (list, dict): A tuple containing a list of arguments (list) and named arguments (dict).
# """
# global _ARG_ESCAPE_SIGN
#
# args_list = []
# args_dict = {}
#
# # State (general)
# inside = (False, None) # Are we inside a quoted string? What is the quoted character?
# skip = False # Skip the current parameter?
# escape = False # Was the escape key used?
# is_string = False # Have we been inside a quoted string?
# temp = "" # Buffer
# key = None # Key (for named parameter)
#
# def _parse_value(temp):
# ret = temp.strip()
# if not is_string:
# try:
# ret = int(ret)
# except ValueError:
# try:
# ret = float(ret)
# except ValueError:
# if ret != "":
# return FunctionArgument(ret)
#
# return ret
#
# def _add_value(skip, key, args_list, args_dict, temp):
# if not skip:
# # Record value based on whether named parameters mode is set or not.
# if key is not None:
# args_dict[key] = _parse_value(temp)
# key = None
# else:
# args_list.append(_parse_value(temp))
#
# for c in s:
# if c == _ARG_ESCAPE_SIGN:
# # Escape sign used.
# if escape:
# # Already escaping: print escape sign itself.
# temp += _ARG_ESCAPE_SIGN
# escape = False
# else:
# # Enter escape mode.
# escape = True
# elif escape:
# # Escape mode: print whatever comes after the symbol.
# escape = False
# temp += c
# elif inside[0] is True:
# # Inside single quotes or double quotes
# # Wait for the end symbol, allow everything else through, allow escape sign for typing quotes in strings
# if c == inside[1]:
# # Leaving single/double quoted area
# inside = (False, None)
# else:
# temp += c
# elif c == "\"" or c == "'":
# # Entering single/double quoted area
# inside = (True, c)
# is_string = True
# continue
# elif c == "=":
# if is_string:
# # Invalid syntax because we don't allow named parameters to be quoted.
# return None
# elif key is None:
# # Named parameters mode and equals sign encountered. Record key and continue with value.
# key = temp.strip()
# temp = ""
# elif c == ",":
# # Comma encountered outside of quoted area.
#
# _add_value(skip, key, args_list, args_dict, temp)
#
# # Reset
# temp = ""
# skip = False
# is_string = False
# key = None
# else:
# # Any other character: add to buffer.
# temp += c
#
# if inside[0] is True:
# # Invalid syntax because we are inside a quoted area.
# return None
# else:
# _add_value(skip, key, args_list, args_dict, temp)
#
# return args_list, args_dict