its * * So the generic regexp is like /^\d\d?(;\d)?[~^$]$/ * * * 2. `\x1b[1;5H` should be parsed as { code: '[H', modifier: 5 } * * This particular example is featuring Ctrl+Home in xterm. * * - `1;5` part is optional, e.g. it could be `\x1b[H` * - `1;` part is optional, e.g. it could be `\x1b[5H` * * So the generic regexp is like /^((\d;)?\d)?[A-Za-z]$/ * */ const cmdStart = s.length - 1; // Skip one or two leading digits if (ch >= '0' && ch <= '9') { s += (ch = yield); if (ch >= '0' && ch <= '9') { s += (ch = yield); } } // skip modifier if (ch === ';') { s += (ch = yield); if (ch >= '0' && ch <= '9') { s += yield; } } /* * We buffered enough data, now trying to extract code * and modifier from it */ const cmd = StringPrototypeSlice(s, cmdStart); let match; if ((match = StringPrototypeMatch(cmd, /^(\d\d?)(;(\d))?([~^$])$/))) { code += match[1] + match[4]; modifier = (match[3] || 1) - 1; } else if ( (match = StringPrototypeMatch(cmd, /^((\d;)?(\d))?([A-Za-z])$/)) ) { code += match[4]; modifier = (match[3] || 1) - 1; } else { code += cmd; } } // Parse the key modifier key.ctrl = !!(modifier & 4); key.meta = !!(modifier & 10); key.shift = !!(modifier & 1); key.code = code; // Parse the key itself switch (code) { /* xterm/gnome ESC [ letter (with modifier) */ case '[P': key.name = 'f1'; break; case '[Q': key.name = 'f2'; break; case '[R': key.name = 'f3'; break; case '[S': key.name = 'f4'; break; /* xterm/gnome ESC O letter (without modifier) */ case 'OP': key.name = 'f1'; break; case 'OQ': key.name = 'f2'; break; case 'OR': key.name = 'f3'; break; case 'OS': key.name = 'f4'; break; /* xterm/rxvt ESC [ number ~ */ case '[11~': key.name = 'f1'; break; case '[12~': key.name = 'f2'; break; case '[13~': key.name = 'f3'; break; case '[14~': key.name = 'f4'; break; /* from Cygwin and used in libuv */ case '[[A': key.name = 'f1'; break; case '[[B': key.name = 'f2'; break; case '[[C': key.name = 'f3'; break; case '[[D': key.name = 'f4'; break; case '[[E': key.name = 'f5'; break; /* common */ case '[15~': key.name = 'f5'; break; case '[17~': key.name = 'f6'; break; case '[18~': key.name = 'f7'; break; case '[19~': key.name = 'f8'; break; case '[20~': key.name = 'f9'; break; case '[21~': key.name = 'f10'; break; case '[23~': key.name = 'f11'; break; case '[24~': key.name = 'f12'; break; /* xterm ESC [ letter */ case '[A': key.name = 'up'; break; case '[B': key.name = 'down'; break; case '[C': key.name = 'right'; break; case '[D': key.name = 'left'; break; case '[E': key.name = 'clear'; break; case '[F': key.name = 'end'; break; case '[H': key.name = 'home'; break; /* xterm/gnome ESC O letter */ case 'OA': key.name = 'up'; break; case 'OB': key.name = 'down'; break; case 'OC': key.name = 'right'; break; case 'OD': key.name = 'left'; break; case 'OE': key.name = 'clear'; break; case 'OF': key.name = 'end'; break; case 'OH': key.name = 'home'; break; /* xterm/rxvt ESC [ number ~ */ case '[1~': key.name = 'home'; break; case '[2~': key.name = 'insert'; break; case '[3~': key.name = 'delete'; break; case '[4~': key.name = 'end'; break; case '[5~': key.name = 'pageup'; break; case '[6~': key.name = 'pagedown'; break; /* putty */ case '[[5~': key.name = 'pageup'; break; case '[[6~': key.name = 'pagedown'; break; /* rxvt */ case '[7~': key.name = 'home'; break; case '[8~': key.name = 'end'; break; /* rxvt keys with modifiers */ case '[a': key.name = 'up'; key.shift = true; break; case '[b': key.name = 'down'; key.shift = true; break; case '[c': key.name = 'right'; key.shift = true; break; case '[d': key.name = 'left'; key.shift = true; break; case '[e': key.name = 'clear'; key.shift = true; break; case '[2$': key.name = 'insert'; key.shift = true; break; case '[3$': key.name = 'delete'; key.shift = true; break; case '[5$': key.name = 'pageup'; key.shift = true; break; case '[6$': key.name = 'pagedown'; key.shift = true; break; case '[7$': key.name = 'home'; key.shift = true; break; case '[8$': key.name = 'end'; key.shift = true; break; case 'Oa': key.name = 'up'; key.ctrl = true; break; case 'Ob': key.name = 'down'; key.ctrl = true; break; case 'Oc': key.name = 'right'; key.ctrl = true; break; case 'Od': key.name = 'left'; key.ctrl = true; break; case 'Oe': key.name = 'clear'; key.ctrl = true; break; case '[2^': key.name = 'insert'; key.ctrl = true; break; case '[3^': key.name = 'delete'; key.ctrl = true; break; case '[5^': key.name = 'pageup'; key.ctrl = true; break; case '[6^': key.name = 'pagedown'; key.ctrl = true; break; case '[7^': key.name = 'home'; key.ctrl = true; break; case '[8^': key.name = 'end'; key.ctrl = true; break; /* misc. */ case '[Z': key.name = 'tab'; key.shift = true; break; default: key.name = 'undefined'; break; } } else if (ch === '\r') { // carriage return key.name = 'return'; key.meta = escaped; } else if (ch === '\n') { // Enter, should have been called linefeed key.name = 'enter'; key.meta = escaped; } else if (ch === '\t') { // tab key.name = 'tab'; key.meta = escaped; } else if (ch === '\b' || ch === '\x7f') { // backspace or ctrl+h key.name = 'backspace'; key.meta = escaped; } else if (ch === kEscape) { // escape key key.name = 'escape'; key.meta = escaped; } else if (ch === ' ') { key.name = 'space'; key.meta = escaped; } else if (!escaped && ch <= '\x1a') { // ctrl+letter key.name = StringFromCharCode( StringPrototypeCharCodeAt(ch) + StringPrototypeCharCodeAt('a') - 1 ); key.ctrl = true; } else if (RegExpPrototypeTest(/^[0-9A-Za-z]$/, ch)) { // Letter, number, shift+letter key.name = StringPrototypeToLowerCase(ch); key.shift = RegExpPrototypeTest(/^[A-Z]$/, ch); key.meta = escaped; } else if (escaped) { // Escape sequence timeout key.name = ch.length ? undefined : 'escape'; key.meta = true; } key.sequence = s; if (s.length !== 0 && (key.name !== undefined || escaped)) { /* Named character or sequence */ stream.emit('keypress', escaped ? undefined : s, key); } else if (charLengthAt(s, 0) === s.length) { /* Single unnamed character, e.g. "." */ stream.emit('keypress', s, key); } /* Unrecognized or broken escape sequence, don't emit anything */ } } // This runs in O(n log n). function commonPrefix(strings) { if (strings.length === 1) { return strings[0]; } const sorted = ArrayPrototypeSort(ArrayPrototypeSlice(strings)); const min = sorted[0]; const max = sorted[sorted.length - 1]; for (let i = 0; i < min.length; i++) { if (min[i] !== max[i]) { return StringPrototypeSlice(min, 0, i); } } return min; } module.exports = { charLengthAt, charLengthLeft, commonPrefix, emitKeys, kSubstringSearch, CSI };