def store_line(linebuf):
""" Store the given line buffer. """
if state.basic_state.protected:
raise error.RunError(error.IFC)
# get the new line number
linebuf.seek(1)
scanline = util.parse_line_number(linebuf)
# check if linebuf is an empty line after the line number
empty = (util.skip_white_read(linebuf) in tk.end_line)
pos, afterpos, deleteable, beyond = find_pos_line_dict(scanline, scanline)
if empty and not deleteable:
raise error.RunError(error.UNDEFINED_LINE_NUMBER)
# read the remainder of the program into a buffer to be pasted back after the write
state.basic_state.bytecode.seek(afterpos)
rest = state.basic_state.bytecode.read()
# insert
state.basic_state.bytecode.seek(pos)
# write the line buffer to the program buffer
length = 0
if not empty:
# set offsets
linebuf.seek(3) # pass \x00\xC0\xDE
length = len(linebuf.getvalue())
state.basic_state.bytecode.write( '\0' + str(vartypes.integer_to_bytes(vartypes.int_to_integer_unsigned(program_memory_start + pos + length))) + linebuf.read())
# write back the remainder of the program
truncate_program(rest)
# update all next offsets by shifting them by the length of the added line
update_line_dict(pos, afterpos, length, deleteable, beyond)
if not empty:
state.basic_state.line_numbers[scanline] = pos
# clear all program stacks
flow.init_program()
state.basic_state.last_stored = scanline
def erase_program():
""" Erase the program from memory. """
state.basic_state.bytecode.truncate(0)
state.basic_state.bytecode.write('\0\0\0')
state.basic_state.protected = False
state.basic_state.line_numbers = {65536: 0}
state.basic_state.current_statement = 0
state.basic_state.last_stored = None
# reset stacks
flow.init_program()
def erase_program():
""" Erase the program from memory. """
state.basic_state.bytecode.truncate(0)
state.basic_state.bytecode.write('\0\0\0')
state.basic_state.protected = False
state.basic_state.line_numbers = { 65536: 0 }
state.basic_state.current_statement = 0
state.basic_state.last_stored = None
# reset stacks
flow.init_program()
def delete(fromline, toline):
""" Delete range of lines from stored program. """
fromline = fromline if fromline is not None else min(state.basic_state.line_numbers)
toline = toline if toline is not None else 65535
startpos, afterpos, deleteable, beyond = find_pos_line_dict(fromline, toline)
if not deleteable:
# no lines selected
raise error.RunError(error.IFC)
# do the delete
state.basic_state.bytecode.seek(afterpos)
rest = state.basic_state.bytecode.read()
state.basic_state.bytecode.seek(startpos)
truncate_program(rest)
# update line number dict
update_line_dict(startpos, afterpos, 0, deleteable, beyond)
# clear all program stacks
flow.init_program()
def delete(fromline, toline):
""" Delete range of lines from stored program. """
fromline = fromline if fromline is not None else min(
state.basic_state.line_numbers)
toline = toline if toline is not None else 65535
startpos, afterpos, deleteable, beyond = find_pos_line_dict(
fromline, toline)
if not deleteable:
# no lines selected
raise error.RunError(error.IFC)
# do the delete
state.basic_state.bytecode.seek(afterpos)
rest = state.basic_state.bytecode.read()
state.basic_state.bytecode.seek(startpos)
truncate_program(rest)
# update line number dict
update_line_dict(startpos, afterpos, 0, deleteable, beyond)
# clear all program stacks
flow.init_program()
def store_line(linebuf):
""" Store the given line buffer. """
if state.basic_state.protected:
raise error.RunError(error.IFC)
# get the new line number
linebuf.seek(1)
scanline = util.parse_line_number(linebuf)
# check if linebuf is an empty line after the line number
empty = (util.skip_white_read(linebuf) in tk.end_line)
pos, afterpos, deleteable, beyond = find_pos_line_dict(scanline, scanline)
if empty and not deleteable:
raise error.RunError(error.UNDEFINED_LINE_NUMBER)
# read the remainder of the program into a buffer to be pasted back after the write
state.basic_state.bytecode.seek(afterpos)
rest = state.basic_state.bytecode.read()
# insert
state.basic_state.bytecode.seek(pos)
# write the line buffer to the program buffer
length = 0
if not empty:
# set offsets
linebuf.seek(3) # pass \x00\xC0\xDE
length = len(linebuf.getvalue())
state.basic_state.bytecode.write(
'\0' +
str(vartypes.value_to_uint(program_memory_start + pos + length)) +
linebuf.read())
# write back the remainder of the program
truncate_program(rest)
# update all next offsets by shifting them by the length of the added line
update_line_dict(pos, afterpos, length, deleteable, beyond)
if not empty:
state.basic_state.line_numbers[scanline] = pos
# clear all program stacks
flow.init_program()
state.basic_state.last_stored = scanline
