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synced 2026-03-10 04:44:18 +00:00
Separate the responsibilities of terminal, display and emulator
This commit is contained in:
Andrew Kay
@@ -83,15 +83,15 @@ class Controller:
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# Initialize the terminal.
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self.terminal = Terminal(self.interface, terminal_id, extended_id)
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(rows, columns) = self.terminal.dimensions
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(rows, columns) = self.terminal.display.dimensions
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keymap_name = self.terminal.keyboard.keymap.name
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self.logger.info(f'Rows = {rows}, Columns = {columns}, Keymap = {keymap_name}')
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self.terminal.clear_screen()
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self.terminal.display.clear_screen()
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# Show the attached indicator on the status line.
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self.terminal.status_line.write_string(0, 'S')
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self.terminal.display.status_line.write_string(0, 'S')
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# Start the process.
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self.host_process = self._start_host_process()
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@@ -165,7 +165,7 @@ class Controller:
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else:
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indicators[0] = 0x00
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self.terminal.status_line.write(35, indicators)
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self.terminal.display.status_line.write(35, indicators)
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if not key:
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return
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@@ -180,7 +180,7 @@ class Controller:
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environment['LC_ALL'] = 'C'
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process = PtyProcess.spawn(self.host_command, env=environment,
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dimensions=self.terminal.dimensions)
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dimensions=self.terminal.display.dimensions)
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return process
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136
oec/display.py
136
oec/display.py
@@ -3,6 +3,10 @@ oec.display
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~~~~~~~~~~~
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"""
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from collections import namedtuple
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import logging
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from coax import write_data
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_ASCII_CHAR_MAP = {
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'>': 0x08,
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'<': 0x09,
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@@ -147,10 +151,138 @@ def encode_string(string, errors='replace'):
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return bytes([encode_ascii_character(character) for character
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in string.encode('ascii', errors)])
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# TODO: remove default columns
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# Does not include the status line row.
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Dimensions = namedtuple('Dimensions', ['rows', 'columns'])
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class Display:
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def __init__(self, interface, dimensions):
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self.logger = logging.getLogger(__name__)
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self.interface = interface
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self.dimensions = dimensions
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(rows, columns) = self.dimensions
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self.buffer = bytearray(rows * columns)
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self.dirty = [False for index in range(rows * columns)]
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self.address_counter = None
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self.status_line = StatusLine(self.interface, columns)
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def load_address_counter(self, address=None, index=None, row=None, column=None):
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"""Load the address counter."""
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if address is None:
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address = self.calculate_address(index=index, row=row, column=column)
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self.interface.offload_load_address_counter(address)
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self.address_counter = address
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def clear_screen(self):
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"""Clear the screen - including the status line."""
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(rows, columns) = self.dimensions
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self.interface.offload_write(b'\x00', address=0, repeat=((rows+1)*columns)-1)
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# TODO: Update the buffer and dirty indicators to reflect the cleared screen.
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self.load_address_counter(index=0)
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def write_buffer(self, byte, index=None, row=None, column=None):
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if index is None:
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if row is not None and column is not None:
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index = self._get_index(row, column)
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else:
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raise ValueError('Either index or row and column is required')
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if self.buffer[index] == byte:
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return False
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self.buffer[index] = byte
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self.dirty[index] = True
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return True
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def flush(self):
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for (start_index, end_index) in self._get_dirty_ranges():
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self._flush_range(start_index, end_index)
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def calculate_address(self, index=None, row=None, column=None):
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if index is not None:
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return self.dimensions.columns + index
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if row is not None and column is not None:
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return self.dimensions.columns + self._get_index(row, column)
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raise ValueError('Either index or row and column is required')
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def _get_index(self, row, column):
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return (row * self.dimensions.columns) + column
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def _get_dirty_ranges(self):
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ranges = []
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start_index = 0
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while start_index < len(self.dirty):
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if self.dirty[start_index]:
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break
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start_index += 1
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end_index = len(self.dirty) - 1
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while end_index >= 0:
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if self.dirty[end_index]:
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break
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end_index -= 1
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if start_index < len(self.dirty) and end_index >= 0:
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ranges.append((start_index, end_index))
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return ranges
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def _flush_range(self, start_index, end_index):
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if self.logger.isEnabledFor(logging.DEBUG):
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self.logger.debug(f'Flushing changes for range {start_index}-{end_index}')
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data = self.buffer[start_index:end_index+1]
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address = self.calculate_address(start_index)
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# TODO: Consider using offload for all writing - set address to None if it is the
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# same as the current address counter to avoid the additional load command.
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if address != self.address_counter:
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try:
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self.interface.offload_write(data, address=address)
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except Exception as error:
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self.logger.error(f'Offload write error: {error}', exc_info=error)
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self.address_counter = address + len(data)
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else:
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try:
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write_data(self.interface, data)
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except Exception as error:
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self.logger.error(f'WRITE_DATA error: {error}', exc_info=error)
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self.address_counter += len(data)
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# Force the address counter to be updated...
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(rows, columns) = self.dimensions
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if self.address_counter >= self.calculate_address((rows * columns) - 1):
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self.address_counter = None
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for index in range(start_index, end_index+1):
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self.dirty[index] = False
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return self.address_counter
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# TODO: add validation of column and data length for write() - must be inside status line
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class StatusLine:
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def __init__(self, interface, columns=80):
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def __init__(self, interface, columns):
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self.interface = interface
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self.columns = columns
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109
oec/emulator.py
109
oec/emulator.py
@@ -5,7 +5,6 @@ oec.emulator
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import logging
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import pyte
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from coax import write_data
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from .display import encode_ascii_character
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from .keyboard import Key, get_ascii_character_for_key
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@@ -75,30 +74,23 @@ class VT100Emulator:
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self.terminal = terminal
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self.host = host
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self.rows = self.terminal.dimensions.rows
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self.columns = self.terminal.dimensions.columns
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# Initialize the VT100 screen.
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(rows, columns) = self.terminal.display.dimensions
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self.vt100_screen = pyte.Screen(self.columns, self.rows)
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self.vt100_screen = pyte.Screen(columns, rows)
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self.vt100_screen.write_process_input = lambda data: host.write(data.encode())
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self.vt100_stream = pyte.ByteStream(self.vt100_screen)
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# TODO: Consider moving the following three attributes to the Terminal class
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# and moving the associated methods.
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self.buffer = bytearray(self.rows * self.columns)
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self.dirty = [False for index in range(self.rows * self.columns)]
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self.address_counter = self._calculate_address(0)
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# Clear the screen.
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self.terminal.clear_screen()
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self.terminal.display.clear_screen()
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# Update the status line.
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self.terminal.status_line.write_string(45, 'VT100')
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self.terminal.display.status_line.write_string(45, 'VT100')
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# Load the address counter.
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self.terminal.interface.offload_load_address_counter(self.address_counter)
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self.terminal.display.load_address_counter(index=0)
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def handle_key(self, key, keyboard_modifiers, scan_code):
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"""Handle a terminal keystroke."""
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@@ -150,107 +142,38 @@ class VT100Emulator:
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return None
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def _get_index(self, row, column):
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return (row * self.columns) + column
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def _calculate_address(self, cursor_index):
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return self.columns + cursor_index
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def _apply(self, screen):
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for row in screen.dirty:
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row_buffer = screen.buffer[row]
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for column in range(self.columns):
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for column in range(self.terminal.display.dimensions.columns):
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character = row_buffer[column]
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# TODO: Investigate multi-byte or zero-byte cases further.
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# TODO: Add additional mapping for special cases such as '^'...
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byte = encode_ascii_character(ord(character.data)) if len(character.data) == 1 else 0x00
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index = self._get_index(row, column)
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if self.buffer[index] != byte:
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self.buffer[index] = byte
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self.dirty[index] = True
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self.terminal.display.write_buffer(byte, row=row, column=column)
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def _flush(self):
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for (start_index, end_index) in self._get_dirty_ranges():
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self._flush_range(start_index, end_index)
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display = self.terminal.display
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display.flush()
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# Syncronize the cursor.
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cursor = self.vt100_screen.cursor
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address = self._calculate_address(self._get_index(cursor.y, cursor.x))
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address = display.calculate_address(row=cursor.y, column=cursor.x)
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# TODO: Investigate different approaches to reducing the need to syncronize the cursor
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# or make it more reliable.
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if address != self.address_counter:
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if address != display.address_counter:
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if self.logger.isEnabledFor(logging.DEBUG):
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self.logger.debug((f'Setting address counter: Address = {address}, '
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f'Address Counter = {self.address_counter}'))
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f'Address Counter = {display.address_counter}'))
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self.terminal.interface.offload_load_address_counter(address)
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self.address_counter = address
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display.load_address_counter(address)
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else:
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if self.logger.isEnabledFor(logging.DEBUG):
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self.logger.debug((f'Skipping address counter: Address Counter = '
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f'{self.address_counter}'))
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def _get_dirty_ranges(self):
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ranges = []
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start_index = 0
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while start_index < len(self.dirty):
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if self.dirty[start_index]:
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break
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start_index += 1
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end_index = len(self.dirty) - 1
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while end_index >= 0:
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if self.dirty[end_index]:
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break
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end_index -= 1
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if start_index < len(self.dirty) and end_index >= 0:
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ranges.append((start_index, end_index))
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return ranges
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def _flush_range(self, start_index, end_index):
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if self.logger.isEnabledFor(logging.DEBUG):
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self.logger.debug(f'Flushing changes for range {start_index}-{end_index}')
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data = self.buffer[start_index:end_index+1]
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address = self._calculate_address(start_index)
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# TODO: Consider using offload for all writing - set address to None if it is the
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# same as the current address counter to avoid the additional load command.
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if address != self.address_counter:
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try:
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self.terminal.interface.offload_write(data, address=address)
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except Exception as error:
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self.logger.error(f'Offload write error: {error}', exc_info=error)
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self.address_counter = address + len(data)
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else:
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try:
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write_data(self.terminal.interface, data)
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except Exception as error:
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self.logger.error(f'WRITE_DATA error: {error}', exc_info=error)
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self.address_counter += len(data)
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# Force the address counter to be updated...
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if self.address_counter >= self._calculate_address((self.rows * self.columns) - 1):
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self.address_counter = None
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for index in range(start_index, end_index+1):
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self.dirty[index] = False
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return self.address_counter
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f'{display.address_counter}'))
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@@ -3,16 +3,11 @@ oec.terminal
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~~~~~~~~~~~~
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"""
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from collections import namedtuple
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from .display import StatusLine
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from .display import Dimensions, Display
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from .keyboard import Keyboard
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from .keymap_3278_2 import KEYMAP as KEYMAP_3278_2
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from .keymap_3483 import KEYMAP as KEYMAP_3483
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# Does not include the status line row.
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Dimensions = namedtuple('Dimensions', ['rows', 'columns'])
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MODEL_DIMENSIONS = {
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2: Dimensions(24, 80),
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3: Dimensions(32, 80),
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@@ -27,14 +22,14 @@ def get_dimensions(terminal_id, extended_id):
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return MODEL_DIMENSIONS[terminal_id.model]
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def get_keyboard(terminal_id, extended_id):
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"""Get keyboard configured with terminal keymap."""
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def get_keymap(terminal_id, extended_id):
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"""Get terminal keymap."""
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keymap = KEYMAP_3278_2
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if extended_id == 'c1348300':
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keymap = KEYMAP_3483
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return Keyboard(keymap)
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return keymap
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class Terminal:
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"""Terminal information, devices and helpers."""
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@@ -44,15 +39,8 @@ class Terminal:
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self.terminal_id = terminal_id
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self.extended_id = extended_id
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self.dimensions = get_dimensions(self.terminal_id, self.extended_id)
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self.keyboard = get_keyboard(self.terminal_id, self.extended_id)
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dimensions = get_dimensions(self.terminal_id, self.extended_id)
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keymap = get_keymap(self.terminal_id, self.extended_id)
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self.status_line = StatusLine(self.interface, self.dimensions.columns)
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def clear_screen(self):
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"""Clear the screen - including the status line."""
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(rows, columns) = self.dimensions
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self.interface.offload_write(b'\x00', address=0, repeat=((rows+1)*columns)-1)
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self.interface.offload_load_address_counter(columns)
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self.display = Display(interface, dimensions)
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self.keyboard = Keyboard(keymap)
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