def parse(self, str):
"""Parse equation object string representation."""
str = str.rstrip("\r\n")
l = str.split(';')
if len(l) != 5:
_logger.error(_('Equation.parse() string invalid (%s)'), str)
return False
if l[2].startswith("<svg>"):
l[2] = SVGImage(data=base64.b64decode(l[2][5:]))
# Should figure out how to use MathLib directly in a non-hacky way
else:
try:
l[2] = Decimal(l[2])
except Exception, inst:
pass
def parse(self, str):
"""Parse equation object string representation."""
str = str.rstrip("\r\n")
k = str.split(';')
if len(k) != 5:
_logger.error(_('Equation.parse() string invalid (%s)'), str)
return False
if k[2].startswith("<svg>"):
k[2] = SVGImage(data=base64.b64decode(k[2][5:]))
# Should figure out how to use MathLib directly in a non-hacky way
else:
try:
k[2] = Decimal(k[2])
except Exception:
pass
self.set(k[0], k[1], k[2], XoColor(color_string=k[3]), k[4])
def process(self):
"""Parse the equation entered and show the result."""
s = _s(self.text_entry.get_text())
label = self.label_entry.get_text()
_logger.debug('process(): parsing %r, label: %r', s, label)
try:
tree = self.parser.parse(s)
res = self.parser.evaluate(tree)
except ParserError as e:
res = e
self.showing_error = True
if isinstance(res, str) and res.find('</svg>') > -1:
res = SVGImage(data=res)
_logger.debug('Result: %r', res)
# Check whether assigning this label would cause recursion
if not isinstance(res, ParserError) and len(label) > 0:
lastpos = self.parser.get_var_used_ofs(label)
if lastpos is not None:
res = RuntimeError(
_('Can not assign label: will cause recursion'),
lastpos)
# If parsing went ok, see if we have to replace the previous answer
# to get a (more) exact result
if self.ans_inserted and not isinstance(res, ParserError) \
and not isinstance(res, SVGImage):
ansvar = self.format_insert_ans()
pos = s.find(ansvar)
if len(ansvar) > 6 and pos != -1:
s2 = s.replace(ansvar, 'LastEqn')
_logger.debug(
'process(): replacing previous answer %r: %r', ansvar, s2)
tree = self.parser.parse(s2)
res = self.parser.evaluate(tree)
if isinstance(res, ParserError):
eqn = Equation(label, _n(s), res, self.color,
self.get_owner_id(), ml=self.ml)
self.set_error_equation(eqn)
else:
eqn = Equation(label, _n(s), _n(str(res)), self.color,
self.get_owner_id(), ml=self.ml)
self.add_equation(eqn, drawlasteq=True, tree=tree)
self.send_message("add_eq", value=str(eqn))
self.parser.set_var('Ans', eqn.result)
# Setting LastEqn to the parse tree would certainly be faster,
# however, it introduces recursion problems
self.parser.set_var('LastEqn', eqn.result)
self.showing_error = False
self.ans_inserted = False
self.text_entry.set_text('')
self.label_entry.set_text('')
return res is not None
def size_for_node(self, node, client):
'''Given a docutils image node, returns the size the image should have
in the PDF document, and what 'kind' of size that is.
That involves lots of guesswork'''
uri = os.path.join(client.basedir, str(node.get("uri")))
srcinfo = client, uri
# Extract all the information from the URI
imgname, extension, options = self.split_uri(uri)
if not os.path.isfile(imgname):
imgname = missing
scale = float(node.get('scale', 100)) / 100
size_known = False
# Figuring out the size to display of an image is ... annoying.
# If the user provides a size with a unit, it's simple, adjustUnits
# will return it in points and we're done.
# However, often the unit wil be "%" (specially if it's meant for
# HTML originally. In which case, we will use a percentage of
# the containing frame.
# Find the image size in pixels:
kind = 'direct'
xdpi, ydpi = client.styles.def_dpi, client.styles.def_dpi
extension = imgname.split('.')[-1].lower()
if extension in ['svg', 'svgz'] and SVGImage.available():
iw, ih = SVGImage(imgname, srcinfo=srcinfo).wrap(0, 0)
# These are in pt, so convert to px
iw = iw * xdpi / 72
ih = ih * ydpi / 72
elif extension in [
"ai", "ccx", "cdr", "cgm", "cmx", "sk1", "sk", "xml", "wmf",
"fig"
] and VectorImage.available():
iw, ih = VectorImage(imgname, srcinfo=srcinfo).wrap(0, 0)
# These are in pt, so convert to px
iw = iw * xdpi / 72
ih = ih * ydpi / 72
elif extension == 'pdf':
if VectorPdf is not None:
box = VectorPdf.load_xobj(srcinfo).BBox
else:
pdf = LazyImports.pdfinfo
if pdf is None:
log.warning(
'PDF images are not supported without pyPdf or pdfrw [%s]',
nodeid(node))
return 0, 0, 'direct'
reader = pdf.PdfFileReader(open(imgname, 'rb'))
box = [float(x) for x in reader.getPage(0)['/MediaBox']]
x1, y1, x2, y2 = box
# These are in pt, so convert to px
iw = float((x2 - x1) * xdpi / 72)
ih = float((y2 - y1) * ydpi / 72)
size_known = True # Assume size from original PDF is OK
else:
keeptrying = True
if LazyImports.PILImage:
try:
img = LazyImports.PILImage.open(imgname)
img.load()
iw, ih = img.size
xdpi, ydpi = img.info.get('dpi', (xdpi, ydpi))
keeptrying = False
except IOError: # PIL throws this when it's a broken/unknown image
pass
if keeptrying and LazyImports.PMImage:
img = LazyImports.PMImage(imgname)
iw = img.size().width()
ih = img.size().height()
density = img.density()
# The density is in pixelspercentimeter (!?)
xdpi = density.width() * 2.54
ydpi = density.height() * 2.54
keeptrying = False
if keeptrying:
log.error(
"The image (%s, %s) is broken or in an unknown format",
imgname, nodeid(node))
raise ValueError
# Try to get the print resolution from the image itself via PIL.
# If it fails, assume a DPI of 300, which is pretty much made up,
# and then a 100% size would be iw*inch/300, so we pass
# that as the second parameter to adjustUnits
#
# Some say the default DPI should be 72. That would mean
# the largest printable image in A4 paper would be something
# like 480x640. That would be awful.
#
w = node.get('width')
h = node.get('height')
if h is None and w is None: # Nothing specified
# Guess from iw, ih
log.warning(
"Using image %s without specifying size."
"Calculating based on image size at %ddpi [%s]", imgname, xdpi,
nodeid(node))
w = iw * inch / xdpi
h = ih * inch / ydpi
elif w is not None:
# Node specifies only w
# In this particular case, we want the default unit
# to be pixels so we work like rst2html
if w[-1] == '%':
kind = 'percentage_of_container'
w = int(w[:-1])
else:
# This uses default DPI setting because we
# are not using the image's "natural size"
# this is what LaTeX does, according to the
# docutils mailing list discussion
w = client.styles.adjustUnits(w,
client.styles.tw,
default_unit='px')
if h is None:
# h is set from w with right aspect ratio
h = w * ih / iw
else:
h = client.styles.adjustUnits(h,
ih * inch / ydpi,
default_unit='px')
elif h is not None and w is None:
if h[-1] != '%':
h = client.styles.adjustUnits(h,
ih * inch / ydpi,
default_unit='px')
# w is set from h with right aspect ratio
w = h * iw / ih
else:
log.error('Setting height as a percentage does **not** work. '\
'ignoring height parameter [%s]', nodeid(node))
# Set both from image data
w = iw * inch / xdpi
h = ih * inch / ydpi
# Apply scale factor
w = w * scale
h = h * scale
# And now we have this probably completely bogus size!
log.info("Image %s size calculated: %fcm by %fcm [%s]", imgname,
w / cm, h / cm, nodeid(node))
return w, h, kind
def process(self):
"""Parse the equation entered and show the result"""
s = unicode(self.text_entry.get_text())
label = unicode(self.label_entry.get_text())
_logger.debug('process(): parsing %r, label: %r', s, label)
try:
tree = self.parser.parse(s)
res = self.parser.evaluate(tree)
except ParserError, e:
res = e
self.showing_error = True
if isinstance(res, str) and res.find('</svg>') > -1:
res = SVGImage(data=res)
_logger.debug('Result: %r', res)
# Check whether assigning this label would cause recursion
if not isinstance(res, ParserError) and len(label) > 0:
lastpos = self.parser.get_var_used_ofs(label)
if lastpos is not None:
res = RuntimeError(
_('Can not assign label: will cause recursion'), lastpos)
# If parsing went ok, see if we have to replace the previous answer
# to get a (more) exact result
if self.ans_inserted and not isinstance(res, ParserError) \
and not isinstance(res, SVGImage):
ansvar = self.format_insert_ans()
class Calculate(ShareableActivity):
TYPE_FUNCTION = 1
TYPE_OP_PRE = 2
TYPE_OP_POST = 3
TYPE_TEXT = 4
SELECT_NONE = 0
SELECT_SELECT = 1
SELECT_TAB = 2
KEYMAP = {
'Return': lambda o: o.process(),
'period': '.',
'equal': '=',
'plus': '+',
'minus': '-',
'asterisk': '*',
'multiply': '×',
'divide': '÷',
'slash': '/',
'BackSpace': lambda o: o.remove_character(-1),
'Delete': lambda o: o.remove_character(1),
'parenleft': '(',
'parenright': ')',
'exclam': '!',
'ampersand': '&',
'bar': '|',
'asciicircum': '^',
'less': '<',
'greater': '>',
'percent': '%',
'comma': ',',
'underscore': '_',
'Left': lambda o: o.move_left(),
'Right': lambda o: o.move_right(),
'Up': lambda o: o.get_older(),
'Down': lambda o: o.get_newer(),
'colon': lambda o: o.label_entered(),
'Home': lambda o: o.text_entry.set_position(0),
'End':
lambda o: o.text_entry.set_position(len(o.text_entry.get_text())),
'Tab': lambda o: o.tab_complete(),
}
CTRL_KEYMAP = {
'c': lambda o: o.text_copy(),
'v': lambda o: o.text_paste(),
'x': lambda o: o.text_cut(),
'q': lambda o: o.close(),
'a': lambda o: o.text_select_all(),
}
SHIFT_KEYMAP = {
'Left': lambda o: o.expand_selection(-1),
'Right': lambda o: o.expand_selection(1),
'Home': lambda o: o.expand_selection(-1000),
'End': lambda o: o.expand_selection(1000),
}
IDENTIFIER_CHARS = \
u"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_ "
def __init__(self, handle):
ShareableActivity.__init__(self, handle)
self.old_eqs = []
self.ml = MathLib()
self.parser = AstParser(self.ml)
# These will result in 'Ans <operator character>' being inserted
self._chars_ans_diadic = [
op[0] for op in self.parser.get_diadic_operators()
]
try:
self._chars_ans_diadic.remove('-')
except:
pass
self.KEYMAP['multiply'] = self.ml.mul_sym
self.KEYMAP['divide'] = self.ml.div_sym
self.KEYMAP['equal'] = self.ml.equ_sym
self.clipboard = gtk.Clipboard()
self.select_reason = self.SELECT_SELECT
self.buffer = u""
self.showing_version = 0
self.showing_error = False
self.ans_inserted = False
self.show_vars = False
self.connect("key_press_event", self.keypress_cb)
self.connect("destroy", self.cleanup_cb)
self.color = sugar.profile.get_color()
self.layout = CalcLayout(self)
self.label_entry = self.layout.label_entry
self.text_entry = self.layout.text_entry
self.last_eq_sig = None
self.last_eqn_textview = None
self.reset()
self.layout.show_it()
self.connect('joined', self._joined_cb)
self.parser.log_debug_info()
def ignore_key_cb(self, widget, event):
return True
def cleanup_cb(self, arg):
_logger.debug('Cleaning up...')
def equation_pressed_cb(self, eqn):
"""Callback for when an equation box is clicked"""
if isinstance(eqn.result, SVGImage):
return True
if len(eqn.label) > 0:
text = eqn.label
else:
# don't insert plain text
if type(eqn.result) in (types.StringType, types.UnicodeType):
text = ''
else:
text = self.parser.ml.format_number(eqn.result)
self.button_pressed(self.TYPE_TEXT, text)
return True
def set_last_equation(self, eqn):
"""Set the 'last equation' TextView"""
if self.last_eq_sig is not None:
self.layout.last_eq.disconnect(self.last_eq_sig)
self.last_eq_sig = None
if not isinstance(eqn.result, ParserError):
self.last_eq_sig = self.layout.last_eq.connect(
'button-press-event',
lambda a1, a2, e: self.equation_pressed_cb(e), eqn)
self.layout.last_eq.set_buffer(eqn.create_lasteq_textbuf())
def set_error_equation(self, eqn):
"""Set equation with error markers. Since set_last_equation implements
this we can just forward the call."""
self.set_last_equation(eqn)
def clear_equations(self):
"""Clear the list of old equations."""
self.old_eqs = []
self.showing_version = 0
def add_equation(self, eq, prepend=False, drawlasteq=False, tree=None):
"""
Insert equation in the history list and set variable if assignment.
Input:
eq: the equation object
prepend: if True, prepend to list, else append
drawlasteq: if True, draw in 'last equation' textbox and queue the
buffer to be added to the history next time an equation is added.
tree: the parsed tree, this will be used to set the label variable
so that the equation can be used symbolicaly.
"""
if eq.equation is not None and len(eq.equation) > 0:
if prepend:
self.old_eqs.insert(0, eq)
else:
self.old_eqs.append(eq)
self.showing_version = len(self.old_eqs)
if self.last_eqn_textview is not None and drawlasteq:
# Prepending here should be the opposite: prepend -> eqn on top.
# We always own this equation
self.layout.add_equation(self.last_eqn_textview,
True,
prepend=not prepend)
self.last_eqn_textview = None
own = (eq.owner == self.get_owner_id())
w = eq.create_history_object()
w.connect('button-press-event',
lambda w, e: self.equation_pressed_cb(eq))
if drawlasteq:
self.set_last_equation(eq)
# SVG images can't be plotted in last equation window
if isinstance(eq.result, SVGImage):
self.layout.add_equation(w, own, prepend=not prepend)
else:
self.last_eqn_textview = w
else:
self.layout.add_equation(w, own, prepend=not prepend)
if eq.label is not None and len(eq.label) > 0:
w = self.create_var_textview(eq.label, eq.result)
if w is not None:
self.layout.add_variable(eq.label, w)
if tree is None:
tree = self.parser.parse(eq.equation)
self.parser.set_var(eq.label, tree)
# FIXME: to be implemented
def process_async(self, eqn):
"""Parse and process an equation asynchronously."""
def process(self):
"""Parse the equation entered and show the result"""
s = unicode(self.text_entry.get_text())
label = unicode(self.label_entry.get_text())
_logger.debug('process(): parsing %r, label: %r', s, label)
try:
tree = self.parser.parse(s)
res = self.parser.evaluate(tree)
except ParserError, e:
res = e
self.showing_error = True
if isinstance(res, str) and res.find('</svg>') > -1:
res = SVGImage(data=res)
_logger.debug('Result: %r', res)
# Check whether assigning this label would cause recursion
if not isinstance(res, ParserError) and len(label) > 0:
lastpos = self.parser.get_var_used_ofs(label)
if lastpos is not None:
res = RuntimeError(
_('Can not assign label: will cause recursion'), lastpos)
# If parsing went ok, see if we have to replace the previous answer
# to get a (more) exact result
if self.ans_inserted and not isinstance(res, ParserError) \
and not isinstance(res, SVGImage):
ansvar = self.format_insert_ans()
pos = s.find(ansvar)
if len(ansvar) > 6 and pos != -1:
s2 = s.replace(ansvar, 'LastEqn')
_logger.debug('process(): replacing previous answer %r: %r',
ansvar, s2)
tree = self.parser.parse(s2)
res = self.parser.evaluate(tree)
eqn = Equation(label,
s,
res,
self.color,
self.get_owner_id(),
ml=self.ml)
if isinstance(res, ParserError):
self.set_error_equation(eqn)
else:
self.add_equation(eqn, drawlasteq=True, tree=tree)
self.send_message("add_eq", value=str(eqn))
self.parser.set_var('Ans', eqn.result)
# Setting LastEqn to the parse tree would certainly be faster,
# however, it introduces recursion problems
self.parser.set_var('LastEqn', eqn.result)
self.showing_error = False
self.ans_inserted = False
self.text_entry.set_text(u'')
self.label_entry.set_text(u'')
return res is not None