| 1 | # -*- test-case-name: twisted.conch.test.test_helper -*- |
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| 2 | # Copyright (c) Twisted Matrix Laboratories. |
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| 3 | # See LICENSE for details. |
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| 4 | |
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| 5 | """ |
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| 6 | Partial in-memory terminal emulator |
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| 7 | |
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| 8 | @author: Jp Calderone |
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| 9 | """ |
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| 10 | |
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| 11 | import re, string |
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| 12 | |
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| 13 | from zope.interface import implements |
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| 14 | |
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| 15 | from twisted.internet import defer, protocol, reactor |
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| 16 | from twisted.python import log |
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| 17 | |
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| 18 | from twisted.conch.insults import insults |
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| 19 | |
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| 20 | FOREGROUND = 30 |
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| 21 | BACKGROUND = 40 |
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| 22 | BLACK, RED, GREEN, YELLOW, BLUE, MAGENTA, CYAN, WHITE, N_COLORS = range(9) |
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| 23 | |
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| 24 | class CharacterAttribute: |
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| 25 | """Represents the attributes of a single character. |
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| 26 | |
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| 27 | Character set, intensity, underlinedness, blinkitude, video |
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| 28 | reversal, as well as foreground and background colors made up a |
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| 29 | character's attributes. |
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| 30 | """ |
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| 31 | def __init__(self, charset=insults.G0, |
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| 32 | bold=False, underline=False, |
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| 33 | blink=False, reverseVideo=False, |
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| 34 | foreground=WHITE, background=BLACK, |
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| 35 | |
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| 36 | _subtracting=False): |
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| 37 | self.charset = charset |
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| 38 | self.bold = bold |
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| 39 | self.underline = underline |
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| 40 | self.blink = blink |
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| 41 | self.reverseVideo = reverseVideo |
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| 42 | self.foreground = foreground |
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| 43 | self.background = background |
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| 44 | |
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| 45 | self._subtracting = _subtracting |
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| 46 | |
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| 47 | def __eq__(self, other): |
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| 48 | return vars(self) == vars(other) |
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| 49 | |
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| 50 | def __ne__(self, other): |
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| 51 | return not self.__eq__(other) |
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| 52 | |
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| 53 | def copy(self): |
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| 54 | c = self.__class__() |
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| 55 | c.__dict__.update(vars(self)) |
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| 56 | return c |
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| 57 | |
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| 58 | def wantOne(self, **kw): |
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| 59 | k, v = kw.popitem() |
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| 60 | if getattr(self, k) != v: |
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| 61 | attr = self.copy() |
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| 62 | attr._subtracting = not v |
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| 63 | setattr(attr, k, v) |
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| 64 | return attr |
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| 65 | else: |
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| 66 | return self.copy() |
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| 67 | |
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| 68 | def toVT102(self): |
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| 69 | # Spit out a vt102 control sequence that will set up |
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| 70 | # all the attributes set here. Except charset. |
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| 71 | attrs = [] |
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| 72 | if self._subtracting: |
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| 73 | attrs.append(0) |
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| 74 | if self.bold: |
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| 75 | attrs.append(insults.BOLD) |
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| 76 | if self.underline: |
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| 77 | attrs.append(insults.UNDERLINE) |
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| 78 | if self.blink: |
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| 79 | attrs.append(insults.BLINK) |
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| 80 | if self.reverseVideo: |
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| 81 | attrs.append(insults.REVERSE_VIDEO) |
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| 82 | if self.foreground != WHITE: |
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| 83 | attrs.append(FOREGROUND + self.foreground) |
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| 84 | if self.background != BLACK: |
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| 85 | attrs.append(BACKGROUND + self.background) |
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| 86 | if attrs: |
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| 87 | return '\x1b[' + ';'.join(map(str, attrs)) + 'm' |
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| 88 | return '' |
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| 89 | |
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| 90 | # XXX - need to support scroll regions and scroll history |
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| 91 | class TerminalBuffer(protocol.Protocol): |
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| 92 | """ |
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| 93 | An in-memory terminal emulator. |
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| 94 | """ |
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| 95 | implements(insults.ITerminalTransport) |
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| 96 | |
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| 97 | for keyID in ('UP_ARROW', 'DOWN_ARROW', 'RIGHT_ARROW', 'LEFT_ARROW', |
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| 98 | 'HOME', 'INSERT', 'DELETE', 'END', 'PGUP', 'PGDN', |
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| 99 | 'F1', 'F2', 'F3', 'F4', 'F5', 'F6', 'F7', 'F8', 'F9', |
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| 100 | 'F10', 'F11', 'F12'): |
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| 101 | exec '%s = object()' % (keyID,) |
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| 102 | |
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| 103 | TAB = '\t' |
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| 104 | BACKSPACE = '\x7f' |
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| 105 | |
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| 106 | width = 80 |
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| 107 | height = 24 |
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| 108 | |
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| 109 | fill = ' ' |
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| 110 | void = object() |
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| 111 | |
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| 112 | def getCharacter(self, x, y): |
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| 113 | return self.lines[y][x] |
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| 114 | |
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| 115 | def connectionMade(self): |
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| 116 | self.reset() |
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| 117 | |
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| 118 | def write(self, bytes): |
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| 119 | """ |
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| 120 | Add the given printable bytes to the terminal. |
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| 121 | |
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| 122 | Line feeds in C{bytes} will be replaced with carriage return / line |
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| 123 | feed pairs. |
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| 124 | """ |
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| 125 | for b in bytes.replace('\n', '\r\n'): |
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| 126 | self.insertAtCursor(b) |
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| 127 | |
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| 128 | def _currentCharacterAttributes(self): |
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| 129 | return CharacterAttribute(self.activeCharset, **self.graphicRendition) |
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| 130 | |
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| 131 | def insertAtCursor(self, b): |
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| 132 | """ |
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| 133 | Add one byte to the terminal at the cursor and make consequent state |
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| 134 | updates. |
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| 135 | |
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| 136 | If b is a carriage return, move the cursor to the beginning of the |
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| 137 | current row. |
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| 138 | |
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| 139 | If b is a line feed, move the cursor to the next row or scroll down if |
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| 140 | the cursor is already in the last row. |
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| 141 | |
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| 142 | Otherwise, if b is printable, put it at the cursor position (inserting |
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| 143 | or overwriting as dictated by the current mode) and move the cursor. |
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| 144 | """ |
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| 145 | if b == '\r': |
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| 146 | self.x = 0 |
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| 147 | elif b == '\n': |
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| 148 | self._scrollDown() |
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| 149 | elif b in string.printable: |
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| 150 | if self.x >= self.width: |
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| 151 | self.nextLine() |
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| 152 | ch = (b, self._currentCharacterAttributes()) |
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| 153 | if self.modes.get(insults.modes.IRM): |
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| 154 | self.lines[self.y][self.x:self.x] = [ch] |
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| 155 | self.lines[self.y].pop() |
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| 156 | else: |
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| 157 | self.lines[self.y][self.x] = ch |
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| 158 | self.x += 1 |
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| 159 | |
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| 160 | def _emptyLine(self, width): |
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| 161 | return [(self.void, self._currentCharacterAttributes()) for i in xrange(width)] |
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| 162 | |
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| 163 | def _scrollDown(self): |
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| 164 | self.y += 1 |
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| 165 | if self.y >= self.height: |
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| 166 | self.y -= 1 |
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| 167 | del self.lines[0] |
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| 168 | self.lines.append(self._emptyLine(self.width)) |
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| 169 | |
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| 170 | def _scrollUp(self): |
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| 171 | self.y -= 1 |
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| 172 | if self.y < 0: |
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| 173 | self.y = 0 |
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| 174 | del self.lines[-1] |
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| 175 | self.lines.insert(0, self._emptyLine(self.width)) |
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| 176 | |
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| 177 | def cursorUp(self, n=1): |
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| 178 | self.y = max(0, self.y - n) |
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| 179 | |
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| 180 | def cursorDown(self, n=1): |
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| 181 | self.y = min(self.height - 1, self.y + n) |
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| 182 | |
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| 183 | def cursorBackward(self, n=1): |
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| 184 | self.x = max(0, self.x - n) |
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| 185 | |
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| 186 | def cursorForward(self, n=1): |
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| 187 | self.x = min(self.width, self.x + n) |
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| 188 | |
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| 189 | def cursorPosition(self, column, line): |
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| 190 | self.x = column |
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| 191 | self.y = line |
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| 192 | |
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| 193 | def cursorHome(self): |
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| 194 | self.x = self.home.x |
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| 195 | self.y = self.home.y |
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| 196 | |
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| 197 | def index(self): |
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| 198 | self._scrollDown() |
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| 199 | |
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| 200 | def reverseIndex(self): |
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| 201 | self._scrollUp() |
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| 202 | |
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| 203 | def nextLine(self): |
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| 204 | """ |
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| 205 | Update the cursor position attributes and scroll down if appropriate. |
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| 206 | """ |
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| 207 | self.x = 0 |
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| 208 | self._scrollDown() |
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| 209 | |
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| 210 | def saveCursor(self): |
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| 211 | self._savedCursor = (self.x, self.y) |
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| 212 | |
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| 213 | def restoreCursor(self): |
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| 214 | self.x, self.y = self._savedCursor |
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| 215 | del self._savedCursor |
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| 216 | |
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| 217 | def setModes(self, modes): |
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| 218 | for m in modes: |
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| 219 | self.modes[m] = True |
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| 220 | |
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| 221 | def resetModes(self, modes): |
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| 222 | for m in modes: |
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| 223 | try: |
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| 224 | del self.modes[m] |
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| 225 | except KeyError: |
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| 226 | pass |
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| 227 | |
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| 228 | |
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| 229 | def setPrivateModes(self, modes): |
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| 230 | """ |
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| 231 | Enable the given modes. |
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| 232 | |
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| 233 | Track which modes have been enabled so that the implementations of |
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| 234 | other L{insults.ITerminalTransport} methods can be properly implemented |
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| 235 | to respect these settings. |
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| 236 | |
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| 237 | @see: L{resetPrivateModes} |
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| 238 | @see: L{insults.ITerminalTransport.setPrivateModes} |
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| 239 | """ |
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| 240 | for m in modes: |
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| 241 | self.privateModes[m] = True |
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| 242 | |
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| 243 | |
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| 244 | def resetPrivateModes(self, modes): |
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| 245 | """ |
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| 246 | Disable the given modes. |
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| 247 | |
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| 248 | @see: L{setPrivateModes} |
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| 249 | @see: L{insults.ITerminalTransport.resetPrivateModes} |
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| 250 | """ |
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| 251 | for m in modes: |
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| 252 | try: |
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| 253 | del self.privateModes[m] |
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| 254 | except KeyError: |
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| 255 | pass |
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| 256 | |
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| 257 | |
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| 258 | def applicationKeypadMode(self): |
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| 259 | self.keypadMode = 'app' |
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| 260 | |
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| 261 | def numericKeypadMode(self): |
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| 262 | self.keypadMode = 'num' |
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| 263 | |
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| 264 | def selectCharacterSet(self, charSet, which): |
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| 265 | self.charsets[which] = charSet |
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| 266 | |
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| 267 | def shiftIn(self): |
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| 268 | self.activeCharset = insults.G0 |
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| 269 | |
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| 270 | def shiftOut(self): |
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| 271 | self.activeCharset = insults.G1 |
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| 272 | |
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| 273 | def singleShift2(self): |
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| 274 | oldActiveCharset = self.activeCharset |
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| 275 | self.activeCharset = insults.G2 |
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| 276 | f = self.insertAtCursor |
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| 277 | def insertAtCursor(b): |
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| 278 | f(b) |
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| 279 | del self.insertAtCursor |
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| 280 | self.activeCharset = oldActiveCharset |
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| 281 | self.insertAtCursor = insertAtCursor |
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| 282 | |
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| 283 | def singleShift3(self): |
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| 284 | oldActiveCharset = self.activeCharset |
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| 285 | self.activeCharset = insults.G3 |
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| 286 | f = self.insertAtCursor |
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| 287 | def insertAtCursor(b): |
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| 288 | f(b) |
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| 289 | del self.insertAtCursor |
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| 290 | self.activeCharset = oldActiveCharset |
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| 291 | self.insertAtCursor = insertAtCursor |
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| 292 | |
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| 293 | def selectGraphicRendition(self, *attributes): |
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| 294 | for a in attributes: |
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| 295 | if a == insults.NORMAL: |
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| 296 | self.graphicRendition = { |
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| 297 | 'bold': False, |
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| 298 | 'underline': False, |
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| 299 | 'blink': False, |
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| 300 | 'reverseVideo': False, |
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| 301 | 'foreground': WHITE, |
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| 302 | 'background': BLACK} |
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| 303 | elif a == insults.BOLD: |
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| 304 | self.graphicRendition['bold'] = True |
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| 305 | elif a == insults.UNDERLINE: |
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| 306 | self.graphicRendition['underline'] = True |
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| 307 | elif a == insults.BLINK: |
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| 308 | self.graphicRendition['blink'] = True |
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| 309 | elif a == insults.REVERSE_VIDEO: |
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| 310 | self.graphicRendition['reverseVideo'] = True |
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| 311 | else: |
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| 312 | try: |
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| 313 | v = int(a) |
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| 314 | except ValueError: |
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| 315 | log.msg("Unknown graphic rendition attribute: " + repr(a)) |
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| 316 | else: |
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| 317 | if FOREGROUND <= v <= FOREGROUND + N_COLORS: |
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| 318 | self.graphicRendition['foreground'] = v - FOREGROUND |
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| 319 | elif BACKGROUND <= v <= BACKGROUND + N_COLORS: |
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| 320 | self.graphicRendition['background'] = v - BACKGROUND |
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| 321 | else: |
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| 322 | log.msg("Unknown graphic rendition attribute: " + repr(a)) |
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| 323 | |
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| 324 | def eraseLine(self): |
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| 325 | self.lines[self.y] = self._emptyLine(self.width) |
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| 326 | |
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| 327 | def eraseToLineEnd(self): |
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| 328 | width = self.width - self.x |
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| 329 | self.lines[self.y][self.x:] = self._emptyLine(width) |
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| 330 | |
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| 331 | def eraseToLineBeginning(self): |
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| 332 | self.lines[self.y][:self.x + 1] = self._emptyLine(self.x + 1) |
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| 333 | |
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| 334 | def eraseDisplay(self): |
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| 335 | self.lines = [self._emptyLine(self.width) for i in xrange(self.height)] |
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| 336 | |
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| 337 | def eraseToDisplayEnd(self): |
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| 338 | self.eraseToLineEnd() |
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| 339 | height = self.height - self.y - 1 |
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| 340 | self.lines[self.y + 1:] = [self._emptyLine(self.width) for i in range(height)] |
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| 341 | |
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| 342 | def eraseToDisplayBeginning(self): |
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| 343 | self.eraseToLineBeginning() |
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| 344 | self.lines[:self.y] = [self._emptyLine(self.width) for i in range(self.y)] |
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| 345 | |
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| 346 | def deleteCharacter(self, n=1): |
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| 347 | del self.lines[self.y][self.x:self.x+n] |
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| 348 | self.lines[self.y].extend(self._emptyLine(min(self.width - self.x, n))) |
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| 349 | |
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| 350 | def insertLine(self, n=1): |
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| 351 | self.lines[self.y:self.y] = [self._emptyLine(self.width) for i in range(n)] |
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| 352 | del self.lines[self.height:] |
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| 353 | |
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| 354 | def deleteLine(self, n=1): |
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| 355 | del self.lines[self.y:self.y+n] |
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| 356 | self.lines.extend([self._emptyLine(self.width) for i in range(n)]) |
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| 357 | |
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| 358 | def reportCursorPosition(self): |
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| 359 | return (self.x, self.y) |
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| 360 | |
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| 361 | def reset(self): |
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| 362 | self.home = insults.Vector(0, 0) |
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| 363 | self.x = self.y = 0 |
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| 364 | self.modes = {} |
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| 365 | self.privateModes = {} |
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| 366 | self.setPrivateModes([insults.privateModes.AUTO_WRAP, |
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| 367 | insults.privateModes.CURSOR_MODE]) |
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| 368 | self.numericKeypad = 'app' |
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| 369 | self.activeCharset = insults.G0 |
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| 370 | self.graphicRendition = { |
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| 371 | 'bold': False, |
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| 372 | 'underline': False, |
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| 373 | 'blink': False, |
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| 374 | 'reverseVideo': False, |
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| 375 | 'foreground': WHITE, |
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| 376 | 'background': BLACK} |
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| 377 | self.charsets = { |
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| 378 | insults.G0: insults.CS_US, |
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| 379 | insults.G1: insults.CS_US, |
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| 380 | insults.G2: insults.CS_ALTERNATE, |
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| 381 | insults.G3: insults.CS_ALTERNATE_SPECIAL} |
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| 382 | self.eraseDisplay() |
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| 383 | |
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| 384 | def unhandledControlSequence(self, buf): |
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| 385 | print 'Could not handle', repr(buf) |
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| 386 | |
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| 387 | def __str__(self): |
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| 388 | lines = [] |
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| 389 | for L in self.lines: |
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| 390 | buf = [] |
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| 391 | length = 0 |
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| 392 | for (ch, attr) in L: |
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| 393 | if ch is not self.void: |
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| 394 | buf.append(ch) |
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| 395 | length = len(buf) |
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| 396 | else: |
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| 397 | buf.append(self.fill) |
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| 398 | lines.append(''.join(buf[:length])) |
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| 399 | return '\n'.join(lines) |
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| 400 | |
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| 401 | class ExpectationTimeout(Exception): |
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| 402 | pass |
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| 403 | |
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| 404 | class ExpectableBuffer(TerminalBuffer): |
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| 405 | _mark = 0 |
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| 406 | |
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| 407 | def connectionMade(self): |
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| 408 | TerminalBuffer.connectionMade(self) |
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| 409 | self._expecting = [] |
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| 410 | |
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| 411 | def write(self, bytes): |
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| 412 | TerminalBuffer.write(self, bytes) |
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| 413 | self._checkExpected() |
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| 414 | |
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| 415 | def cursorHome(self): |
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| 416 | TerminalBuffer.cursorHome(self) |
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| 417 | self._mark = 0 |
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| 418 | |
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| 419 | def _timeoutExpected(self, d): |
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| 420 | d.errback(ExpectationTimeout()) |
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| 421 | self._checkExpected() |
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| 422 | |
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| 423 | def _checkExpected(self): |
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| 424 | s = str(self)[self._mark:] |
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| 425 | while self._expecting: |
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| 426 | expr, timer, deferred = self._expecting[0] |
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| 427 | if timer and not timer.active(): |
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| 428 | del self._expecting[0] |
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| 429 | continue |
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| 430 | for match in expr.finditer(s): |
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| 431 | if timer: |
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| 432 | timer.cancel() |
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| 433 | del self._expecting[0] |
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| 434 | self._mark += match.end() |
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| 435 | s = s[match.end():] |
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| 436 | deferred.callback(match) |
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| 437 | break |
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| 438 | else: |
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| 439 | return |
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| 440 | |
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| 441 | def expect(self, expression, timeout=None, scheduler=reactor): |
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| 442 | d = defer.Deferred() |
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| 443 | timer = None |
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| 444 | if timeout: |
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| 445 | timer = scheduler.callLater(timeout, self._timeoutExpected, d) |
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| 446 | self._expecting.append((re.compile(expression), timer, d)) |
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| 447 | self._checkExpected() |
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| 448 | return d |
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| 449 | |
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| 450 | __all__ = ['CharacterAttribute', 'TerminalBuffer', 'ExpectableBuffer'] |
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