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from __future__ import (absolute_import, division,
print_function, unicode_literals)
from future.builtins import *
import os
import re
class Block(object):
_highest_id = 0
def __init__(self, selector, shape, parts_or_spec, is_blocking=False,
help_text="", defaults=[]):
self.shape = str(shape)
"""A string determining the kind of values the block reports.
* ``"command"`` -- Doesn't report a value. (puzzle-piece)
* ``"reporter"`` -- Reports a number. (round ends)
* ``"predicate"`` -- Reports a boolean. (pointy ends)
"""
if selector.startswith("_"):
raise ValueError("names starting with an underscore are reserved")
self.selector = str(selector)
"""Used by the block language to identify the block."""
if isinstance(parts_or_spec, list):
self.parts = [p if isinstance(p, Input) else str(p) for p in parts]
else:
self.parts = parse_spec(parts_or_spec)
for input_, value in zip(self.inputs, defaults):
input_.default = value
self.is_blocking = bool(is_blocking)
"""True if the block language should wait for the block to return."""
self.help_text = str(help_text)
"""Text explaining the block to a Scratch user."""
self.translations = {}
@property
def inputs(self):
return [p for p in self.parts if isinstance(p, Input)]
@property
def defaults(self):
return [x.default for x in self.inputs]
@property
def spec(self):
return generate_spec(self.parts)
def __repr__(self):
return "<Block({spec})>".format(spec=repr(generate_spec(self.parts)))
def __call__(self, func):
func._block = self
Block._highest_id += 1
func._block_id = Block._highest_id
return func
class Input(object):
"""The specification for an argument to a :class:`Block`."""
DEFAULTS = {
"number": 0,
"number-menu": 0,
"readonly-menu": None, # Set in _set_menu_defaults()
"string": "",
"boolean": False,
}
def __init__(self, shape, menu=None):
self.shape = str(shape)
"""A string identifying the kind of values the input accepts.
* ``'number'`` -- number input (round ends)
* ``'string'`` -- string input (square ends)
* ``'boolean'`` -- boolean input (pointy ends)
* ``'readonly-menu'`` -- menu input
* ``'number-menu'`` -- editable number input with menu
* ``'color'`` -- color input with picker
"""
if 'menu' in shape:
assert menu, "Menu is required"
else:
assert not menu, "Menu not allowed"
self.menu = str(menu) if menu else None
"""For menu inputs: the options the drop-down menu contains.
The options come from an earlier :attr:`Extension.menu` call::
ext.add_menu("menuName", ["one", "two", "three", ...])
"""
self.default = Input.DEFAULTS.get(self.shape)
def __repr__(self):
r = "Input({}".format(repr(self.menu))
if self.menu:
r += ", menu={}".format(repr(self.menu))
return r + ")"
def __eq__(self, other):
return (isinstance(other, Input) and self.shape == other.shape
and self.menu == other.menu)
def _set_menu_defaults(self, menus):
if self.default is None:
self.default = ""
if self.shape == "readonly-menu":
try:
options = menus[self.menu]
except KeyError:
raise ValueError(
"menu not found: {}".format(repr(self.menu))
)
self.default = options[0]
INPUT_SPECS = {
"n": "number",
"s": "string",
"b": "boolean",
"m": "readonly-menu",
"d": "number-menu",
"c": "color",
}
def parse_spec(spec):
def generate_parts(spec):
for part in re.split(r"(%[^ ](?:\.[A-z]+)?)", spec):
match = re.match(r"^%([^ ])(?:\.([A-z]+))?$", part)
if match:
shape = INPUT_SPECS.get(match.group(1))
if not shape:
raise ValueError("Unknown input shape %s" % part)
part = Input(shape, match.group(2))
else:
part = str(part)
yield part
spec = str(spec)
parts = list(generate_parts(spec))
inputs = [p for p in parts if isinstance(p, Input)]
return parts
def generate_spec(block_parts):
"""A string identifying the labels and inputs to the block.
Words starting with "%" produce input slots. Supported input types are:
* ``%n`` -- number input (round ends)
* ``%s`` -- string input (square ends)
* ``%b`` -- boolean input (pointy ends)
* ``%m.menuName`` -- menu input
* ``%d.menuName`` -- editable number input with menu
The last two input slots produce a drop-down menu. The options come
from an earlier :attr:`Extension.menu` call::
ext.add_menu("menuName", ["one", "two", "three", ...])
"""
def stringify_part(part):
if isinstance(part, Input):
for s, shape in INPUT_SPECS.items():
if shape == part.shape:
break
else:
assert False
r = "%" + s
if part.menu:
r += "." + part.menu
return r
return part
spec = "".join(map(stringify_part, block_parts))
return spec
def load_po_files(this_file, relative_folder=None, **language_file_paths):
translations = {}
base = ""
if this_file is not None:
base = os.path.abspath(os.path.dirname(this_file))
if relative_folder:
base = os.path.join(base, relative_folder)
for lang, path in language_file_paths.items():
path = os.path.join(base, path)
with open(path) as f:
translations[lang] = Language.from_po_file(f)
return translations
class Language(object):
def __init__(self, strings):
self._strings = strings
def __getitem__(self, key):
"""Return translation if possible, else untranslated string."""
return self._strings.get(key, key)
get = __getitem__
@classmethod
def from_po_file(cls, path):
return
raise NotImplementedError()
def get_menus(self, menus):
translated_menus = {}
for key, options in menus.items():
translated_menus[key] = list(map(self.get, options))
return translated_menus
class Descriptor(object):
def __init__(self, name, port, blocks, menus=None, translations=None):
self.name = str(name)
"""Human-readable name of the hardware."""
self.port = int(port)
"""Port the extension runs on."""
self.blocks = list(blocks)
"""The list of blocks displayed in the interface."""
menus = menus or {}
menus = dict((str(k), list(map(str, v))) for k, v in menus.items())
self.menus = menus
"""Options for custom drop-down menus."""
translations = translations or {}
if "en" in translations:
raise ValueError("english must be default")
translations["en"] = Language({})
self.translations = translations
"""Translations for block specs and menu options."""
# Set default menu options
for block in self.blocks:
for input_ in block.inputs:
input_._set_menu_defaults(self.menus)
def __repr__(self):
return "<Descriptor(%r, %i)>" % (self.name, self.port)
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