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# calculate.py, sugar calculator, by:
# Reinier Heeres <reinier@heeres.eu>
# Miguel Alvarez <miguel@laptop.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
# Change log:
# 2007-07-03: rwh, first version
import types
import os
from gettext import gettext as _
import string
import logging
_logger = logging.getLogger('Calculate')
import gobject
import pygtk
pygtk.require('2.0')
import gtk
import pango
from sugar.activity import activity
import sugar.profile
from sugar.graphics.canvasicon import CanvasIcon
from sugar.graphics.xocolor import XoColor
try:
from sugar.graphics import font
except:
#Nothing
pass
from sharedstate.sharedstate import SharingHelper
from layout import CalcLayout
from mathlib import MathLib
from eqnparser import EqnParser
class Equation:
def __init__(self, label, eqn, res, col):
self.label = label
self.equation = eqn
self.result = res
self.color = col
class Calculate(activity.Activity):
TYPE_FUNCTION = 1
TYPE_OP_PRE = 2
TYPE_OP_POST = 3
TYPE_TEXT = 4
FONT_SMALL = "sans 10"
FONT_SMALL_NARROW = "sans italic 10"
FONT_BIG = "sans bold 16"
FONT_BIG_NARROW = "sans italic 16"
FONT_BIGGER = "sans bold 22"
def __init__(self, handle):
activity.Activity.__init__(self, handle)
self.set_title("Calculate")
self.connect("key_press_event", self.keypress_cb)
self.connect("destroy", self.cleanup_cb)
self.color = sugar.profile.get_color()
## self.icon = CanvasIcon(
## icon_name = 'theme:stock-buddy',
## xo_color = XoColor(self.color))
self.layout = CalcLayout(self)
self.label_entry = self.layout.label_entry
self.text_entry = self.layout.text_entry
self.history = self.layout.history
self.last_eq = self.layout.last_eq.get_buffer()
self.ml = MathLib()
self.parser = EqnParser(self.ml)
_logger.debug("Parser: %s",self.parser)
self.buffer = ""
self.showing_version = 0
self.old_changed = False # This variable should be thrown out somehow
self.show_vars = False
self.helper = SharingHelper(self)
self.helper.create_shared_object('old_eqs',
{'changed': lambda x: self.refresh_bar(),
'type': 'python'},
iv = [])
self.helper.create_shared_object('vars',
{'changed': lambda x: self.refresh_bar(),
'type': 'python'},
iv = [])
# self.old_eqs = [] # List of Equation objects
self.reset()
def ignore_key_cb(self, widget, event):
return True
def cleanup_cb(self, arg):
_logger.debug('Cleaning up...')
def equation_pressed_cb(self, n):
"""Callback for when an equation box is clicked"""
if len(self.helper['old_eqs']) <= n:
return True
if len(self.helper['old_eqs'][n].label) > 0:
text = self.helper['old_eqs'][n].label
else:
text = self.helper['old_eqs'][n].equation
self.button_pressed(self.TYPE_TEXT, text)
return True
def format_last_eq_buf(self, buf, res, offset):
eq_start = buf.get_start_iter()
eq_middle = buf.get_iter_at_line(1)
eq_end = buf.get_end_iter()
buf.apply_tag(buf.create_tag(font=self.FONT_BIG_NARROW),
eq_start, eq_middle)
buf.apply_tag(buf.create_tag(font=self.FONT_BIGGER,
justification=gtk.JUSTIFY_RIGHT), eq_middle, eq_end)
if res is None:
eq_start.forward_chars(offset)
end = self.last_eq.get_start_iter()
end.forward_chars(offset+1)
self.last_eq.apply_tag(self.last_eq.create_tag(foreground='#FF0000'),
eq_start, end)
self.last_eq.apply_tag(self.last_eq.create_tag(foreground='#FF0000'),
eq_middle, eq_end)
def set_last_equation(self, eqn):
text = ""
if len(eqn.label) > 0:
text += eqn.label + ': ' + eqn.equation
offset = len(eqn.label) + 2
else:
text += eqn.equation
offset = 0
if eqn.result is not None:
text += '\n= ' + self.ml.format_number(eqn.result)
self.text_entry.set_text('')
self.parser.set_var('Ans', self.ml.format_number(eqn.result))
if len(eqn.label) > 0:
self.label_entry.set_text('')
self.parser.set_var(eqn.label, eqn.equation)
else:
pos = self.parser.get_error_offset()
if pos == len(text) - 1:
text += '_'
offset += pos
text += '\nError at %d' % pos
self.last_eq.set_text(text)
self.format_last_eq_buf(self.last_eq, eqn.result, offset)
def process(self):
s = self.text_entry.get_text()
label = self.label_entry.get_text()
_logger.debug('process(): parsing \'%s\', label: \'%s\'', s, label)
res = self.parser.parse(s)
eqn = Equation(label, s, res, self.color)
self.set_last_equation(eqn)
if res is not None:
#self.helper['old_eqs'].insert(0, eqn)
tmp = self.helper['old_eqs'][:]
tmp.insert(0,eqn)
self.helper['old_eqs'] = tmp
self.old_changed = True
self.refresh_bar()
return res is not None
def refresh_bar(self):
_logger.debug('Refreshing right bar...')
if self.layout.varbut.selected == 0:
self.refresh_history()
else:
self.refresh_vars()
def format_var_buf(self, buf):
iter_start = buf.get_start_iter()
iter_end = buf.get_end_iter()
buf.apply_tag(buf.create_tag(font=self.FONT_SMALL_NARROW),
iter_start, iter_end)
buf.apply_tag(buf.create_tag(foreground=self.color.get_fill_color()),
iter_start, iter_end)
def refresh_vars(self):
list = []
for name, value in self.parser.get_vars():
if name == "Ans":
continue
w = gtk.TextView()
b = w.get_buffer()
b.set_text(name + ":\t" + value)
self.format_var_buf(b)
list.append(w)
self.layout.show_history(list)
self.old_changed = True
def format_history_buf(self, buf):
iter_start = buf.get_start_iter()
iter_colon = buf.get_start_iter()
iter_end = buf.get_end_iter()
iter_middle = buf.get_iter_at_line(1)
try:
pos = buf.get_text(iter_start, iter_end).index(':')
iter_colon.forward_chars(pos)
except:
buf.apply_tag(buf.create_tag(font=self.FONT_SMALL),
iter_start, iter_middle)
else:
buf.apply_tag(buf.create_tag(font=self.FONT_SMALL_NARROW),
iter_start, iter_colon)
buf.apply_tag(buf.create_tag(font=self.FONT_SMALL),
iter_colon, iter_middle)
buf.apply_tag(buf.create_tag(font=self.FONT_BIG,
justification=gtk.JUSTIFY_RIGHT), iter_middle, iter_end)
buf.apply_tag(buf.create_tag(foreground=self.color.get_fill_color()),
iter_start, iter_end)
def refresh_history(self):
if not self.old_changed:
return
list = []
if len(self.helper['old_eqs']) > 1:
i = 1
for e in self.helper['old_eqs'][1:]:
text = ""
if len(e.label) > 0:
text += str(e.label) + ": "
r = self.ml.format_number(e.result)
text += str(e.equation) + "\n=" + r
w = gtk.TextView()
w.connect('button-press-event', lambda w, e, j: self.equation_pressed_cb(j), i)
b = w.get_buffer()
## b.modify_bg(gtk.STATE_ACTIVE | gtk.STATE_NORMAL,
## gtk.gdk.color_parse(self.color.get_fill_color()))
b.set_text(text)
self.format_history_buf(b)
list.append(w)
i += 1
self.layout.show_history(list)
self.old_changed = False
def clear(self):
_logger.debug('Clearing...')
self.text_entry.set_text('')
self.text_entry.grab_focus()
return True
def reset(self):
_logger.debug('Resetting...')
self.clear()
return True
##########################################
# User interaction functions
##########################################
def remove_character(self, dir):
pos = self.text_entry.get_position()
print 'Position: %d, dir: %d, len: %d' % (pos, dir, len(self.text_entry.get_text()))
if pos + dir <= len(self.text_entry.get_text()) and pos + dir >= 0:
if dir < 0:
self.text_entry.delete_text(pos+dir, pos)
else:
self.text_entry.delete_text(pos, pos+dir)
def move_left(self):
pos = self.text_entry.get_position()
if pos > 0:
self.text_entry.set_position(pos - 1)
def move_right(self):
pos = self.text_entry.get_position()
if pos < len(self.text_entry.get_text()):
self.text_entry.set_position(pos + 1)
def label_entered(self):
if len(self.label_entry.get_text()) > 0:
return
pos = self.text_entry.get_position()
str = self.text_entry.get_text()
self.label_entry.set_text(str[:pos])
self.text_entry.set_text(str[pos:])
def keypress_cb(self, widget, event):
if self.label_entry.is_focus():
return
key = gtk.gdk.keyval_name(event.keyval)
_logger.debug('Key: %s (%r)', key, event.keyval)
allowed_chars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ "
if key in allowed_chars:
self.add_text(key)
keymap = {
'Return': lambda: self.process(),
'period': '.',
'equal': '=',
'plus': '+',
'minus': '-',
'asterisk': '*',
'slash': '/',
'BackSpace': lambda: self.remove_character(-1),
'Delete': lambda: self.remove_character(1),
'parenleft': '(',
'parenright': ')',
'exclam': '!',
'ampersand': '&',
'bar': '|',
'asciicircum': '^',
'less': '<',
'greater': '>',
'Left': lambda: self.move_left(),
'Right': lambda: self.move_right(),
'Up': lambda: self.get_older(),
'Down':lambda: self.get_newer(),
'colon': lambda: self.label_entered(),
'Home': lambda: self.text_entry.set_position(0),
'End': lambda: self.text_entry.set_position(len(self.text_entry.get_text()))
}
if keymap.has_key(key):
f = keymap[key]
if type(f) is types.StringType:
self.add_text(f)
else:
return f()
return True
def get_older(self):
self.showing_version = min(len(sel.helper['old_eqs']), self.showiing_version + 1)
if self.showing_version == 1:
self.buffer = self.text_entry.get_text()
self.text_entry.set_text(self.helper['old_eqs'][self.showing_version - 1].equation)
def get_newer(self):
self.showing_version = max(0, self.showing_version - 1)
if self.showing_version == 0:
self.text_entry.set_text(self.buffer)
return
self.text_entry.set_text(self.helper['old_eqs'][self.showing_version - 1].equation)
def add_text(self, c):
pos = self.text_entry.get_position()
tlen = len(self.text_entry.get_text())
if tlen == 0 and c in self.parser.get_diadic_operators():
c = 'Ans' + c
self.text_entry.insert_text(c, pos)
self.text_entry.grab_focus()
self.text_entry.set_position(pos + len(c))
# This function should be split up properly
def button_pressed(self, type, str):
sel = self.text_entry.get_selection_bounds()
pos = self.text_entry.get_position()
self.text_entry.grab_focus()
if len(sel) == 2:
(start, end) = sel
text = self.text_entry.get_text()
elif len(sel) != 0:
_logger.error('button_pressed(): len(sel) != 0 or 2')
return False
if type == self.TYPE_FUNCTION:
if sel is ():
self.text_entry.insert_text(str + '()', pos)
self.text_entry.set_position(pos + len(str) + 1)
else:
self.text_entry.set_text(text[:start] + str + '(' + text[start:end] + ')' + text[end:])
self.text_entry.set_position(end + len(str) + 2)
elif type == self.TYPE_OP_PRE:
if len(sel) is 2:
pos = start
elif pos == 0:
str = 'Ans' + str
self.text_entry.insert_text(str, pos)
self.text_entry.set_position(pos + len(str))
elif type == self.TYPE_OP_POST:
if len(sel) is 2:
pos = end
self.text_entry.insert_text(str, pos)
self.text_entry.set_position(pos + len(str))
elif type == self.TYPE_TEXT:
if len(sel) is 2:
self.text_entry.set_text(text[:start] + str + text[end:])
self.text_entry.set_position(pos + start - end + len(str))
else:
self.text_entry.insert_text(str, pos)
self.text_entry.set_position(pos + len(str))
else:
_logger.error('Calculate.button_pressed(): invalid type')
def main():
win = gtk.Window(gtk.WINDOW_TOPLEVEL)
t = Calc(win)
gtk.main()
return 0
if __name__ == "__main__":
main()
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