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 gcode-157

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utils.py

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from __future__ import absolute_import, division, unicode_literals

from types import ModuleType

from six import text_type

from .constants import invisibleChars

class MethodDispatcher(dict):

"""Dict with 2 special properties:

On initiation, keys that are lists, sets or tuples are converted to

multiple keys so accessing any one of the items in the original

list-like object returns the matching value

md = MethodDispatcher({("foo", "bar"):"baz"})

md["foo"] == "baz"

A default value which can be set through the default attribute.

"""

def __init__(self, items=()):

# Using _dictEntries instead of directly assigning to self is about

# twice as fast. Please do careful performance testing before changing

# anything here.

_dictEntries = []

for name, value in items:

if type(name) in (list, tuple, frozenset, set):

for item in name:

_dictEntries.append((item, value))

else:

_dictEntries.append((name, value))

dict.__init__(self, _dictEntries)

self.default = None

def __getitem__(self, key):

return dict.get(self, key, self.default)

# Some utility functions to dal with weirdness around UCS2 vs UCS4

# python builds

def isSurrogatePair(data):

return (len(data) == 2 and

ord(data[0]) >= 0xD800 and ord(data[0]) <= 0xDBFF and

ord(data[1]) >= 0xDC00 and ord(data[1]) <= 0xDFFF)

def surrogatePairToCodepoint(data):

char_val = (0x10000 + (ord(data[0]) - 0xD800) * 0x400 +

(ord(data[1]) - 0xDC00))

return char_val

# Module Factory Factory (no, this isn't Java, I know)

# Here to stop this being duplicated all over the place.

def moduleFactoryFactory(factory):

moduleCache = {}

def moduleFactory(baseModule, *args, **kwargs):

if isinstance(ModuleType.__name__, type("")):

name = "_%s_factory" % baseModule.__name__

else:

name = b"_%s_factory" % baseModule.__name__

if name in moduleCache:

return moduleCache[name]

else:

mod = ModuleType(name)

objs = factory(baseModule, *args, **kwargs)

mod.__dict__.update(objs)

moduleCache[name] = mod

return mod

return moduleFactory

def escapeInvisible(text, useNamedEntities=False):

"""Escape invisible characters other than Tab, LF, CR, and ASCII space

"""

assert type(text) == text_type

# This algorithm is O(MN) for M len(text) and N num escapable

# But it doesn't modify the text when N is zero (common case) and

# N is expected to be small (usually 1 or 2) in most other cases.

escapable = set()

for c in text:

if ord(c) in invisibleChars:

escapable.add(c)

if useNamedEntities:

# for c in escapable:

# name = codepoint2name.get(ord(c))

# escape = "&%s;" % name if name else "&#x%X;" % ord(c)

# text = text.replace(c, escape)

raise NotImplementedError("This doesn't work on Python 3")

else:

for c in escapable:

text = text.replace(c, "&#x%X;" % ord(c))

return text