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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 | 73x 73x 73x 73x 73x 73x 73x 73x 73x 73x 73x 73x 73x 73x 73x 73x 73x 73x 73x 73x 73x 73x 73x 73x 73x 73x | // screen_capture.js — Free functions for screen capture/restore on a grid
// Grid format: grid[r][c] = { ch, color, attr }
import {
CLR_BLACK, CLR_GRAY, CLR_ORANGE, CLR_BRIGHT_GREEN, CLR_YELLOW,
CLR_BRIGHT_BLUE, CLR_BRIGHT_MAGENTA, CLR_BRIGHT_CYAN, CLR_WHITE,
DEC_TO_UNICODE,
} from './terminal.js';
// Return rows-line string array matching C TTY screen format.
export function getScreenLines(grid, rows, cols) {
const result = [];
for (let r = 0; r < rows; r++) {
let line = '';
for (let c = 0; c < cols; c++) {
line += grid[r][c].ch;
}
// Right-trim spaces (C session screens are right-trimmed)
line = line.replace(/ +$/, '');
result.push(line);
}
return result;
}
// Return rows-line ANSI string array including SGR color/attribute changes.
export function getScreenAnsiLines(grid, rows, cols) {
const fgCode = (color) => {
switch (color) {
case 0: return 90; // CLR_BLACK → bright black / dark gray (matches C tty)
case 1: return 31; // red
case 2: return 32; // green
case 3: return 33; // brown
case 4: return 34; // blue
case 5: return 35; // magenta
case 6: return 36; // cyan
case 7: return 37; // gray
case 8: return 90; // no-color/dark gray
case 9: return 91; // orange / bright red in tty SGR
case 10: return 92; // bright green
case 11: return 93; // yellow
case 12: return 94; // bright blue
case 13: return 95; // bright magenta
case 14: return 96; // bright cyan
case 15: return 97; // white
default: return 37;
}
};
const bgCode = (color) => {
switch (color) {
case 0: return 40; case 1: return 41;
case 2: return 42; case 3: return 43;
case 4: return 44; case 5: return 45;
case 6: return 46; case 7: return 47;
case 8: return 100; case 9: return 101;
case 10: return 102; case 11: return 103;
case 12: return 104; case 13: return 105;
case 14: return 106; case 15: return 107;
default: return 40;
}
};
const styleKey = (fg, bg, attr) => `${fg}|${bg}|${attr}`;
const out = [];
for (let r = 0; r < rows; r++) {
// Trim trailing plain (non-styled) spaces
let end = cols - 1;
while (end >= 0 && grid[r][end].ch === ' ' && !grid[r][end].attr) end--;
if (end < 0) {
out.push('');
continue;
}
let line = '';
let curKey = '';
for (let c = 0; c <= end; c++) {
const cell = grid[r][c];
const ch = cell.ch || ' ';
const fg = Number.isInteger(cell.color) ? cell.color : 7;
const a = Number.isInteger(cell.attr) ? cell.attr : 0;
const inverse = (a & 1) !== 0;
const bold = (a & 2) !== 0;
const underline = (a & 4) !== 0;
const styleFg = fg;
const styleBg = 0;
const key = styleKey(styleFg, styleBg, a);
if (key !== curKey) {
const sgr = [0, fgCode(styleFg), bgCode(styleBg)];
if (bold) sgr.push(1);
if (underline) sgr.push(4);
if (inverse) sgr.push(7);
line += `\x1b[${sgr.join(';')}m`;
curKey = key;
}
line += ch;
}
line += '\x1b[0m';
out.push(line);
}
return out;
}
// Overwrite the grid from captured plain-text session lines.
export function setScreenLines(grid, rows, cols, lines) {
const src = Array.isArray(lines) ? lines : [];
for (let r = 0; r < rows; r++) {
const line = (r < src.length ? src[r] : '') || '';
for (let c = 0; c < cols; c++) {
grid[r][c] = { ch: c < line.length ? line[c] : ' ', color: CLR_GRAY, attr: 0 };
}
}
}
// Overwrite grid from ANSI-colored session lines.
export function setScreenAnsiLines(grid, rows, cols, lines) {
// Clear first
for (let r = 0; r < rows; r++) {
for (let c = 0; c < cols; c++) {
grid[r][c] = { ch: ' ', color: CLR_GRAY, attr: 0 };
}
}
const src = Array.isArray(lines) ? lines : [];
for (let r = 0; r < rows && r < src.length; r++) {
const line = String(src[r] || '');
let i = 0;
let col = 0;
let fg = CLR_GRAY;
let attr = 0; // bit1=inverse, bit2=bold, bit4=underline
const applySgr = (codes) => {
const list = codes.length ? codes : [0];
for (const code of list) {
if (code === 0) {
fg = CLR_GRAY;
attr = 0;
} else if (code === 1) attr |= 2;
else if (code === 4) attr |= 4;
else if (code === 7) attr |= 1;
else if (code === 22) attr &= ~2;
else if (code === 24) attr &= ~4;
else if (code === 27) attr &= ~1;
else if (code >= 30 && code <= 37) fg = code - 30;
else if (code >= 90 && code <= 97) {
// ANSI bright palette in tty capture maps to NetHack's
// color table, not a simple +8 offset:
// 90=black, 91=orange, 92=bright green, 93=yellow,
// 94=bright blue, 95=bright magenta, 96=bright cyan, 97=white.
switch (code) {
case 90: fg = CLR_BLACK; break;
case 91: fg = CLR_ORANGE; break;
case 92: fg = CLR_BRIGHT_GREEN; break;
case 93: fg = CLR_YELLOW; break;
case 94: fg = CLR_BRIGHT_BLUE; break;
case 95: fg = CLR_BRIGHT_MAGENTA; break;
case 96: fg = CLR_BRIGHT_CYAN; break;
case 97: fg = CLR_WHITE; break;
}
}
else if (code === 39) fg = CLR_GRAY;
}
};
let decGraphics = false;
while (i < line.length && col < cols) {
const ch = line[i];
if (ch === '\x0e') { decGraphics = true; i++; continue; }
if (ch === '\x0f') { decGraphics = false; i++; continue; }
if (ch === '\x1b' && line[i + 1] === '[') {
let j = i + 2;
while (j < line.length && !/[A-Za-z]/.test(line[j])) j++;
if (j < line.length) {
const cmd = line[j];
const body = line.slice(i + 2, j);
if (cmd === 'm') {
const codes = body.length === 0
? [0]
: body.split(';')
.map((s) => Number.parseInt(s || '0', 10))
.filter((n) => Number.isFinite(n));
applySgr(codes);
} else if (cmd === 'C') {
const n = Math.max(1, Number.parseInt(body || '1', 10) || 1);
col = Math.min(cols, col + n);
}
i = j + 1;
continue;
}
}
if (ch !== '\r' && ch !== '\n') {
const decoded = decGraphics ? (DEC_TO_UNICODE[ch] || ch) : ch;
grid[r][col] = { ch: decoded, color: fg, attr };
col++;
}
i++;
}
}
}
// Return rows-line attribute array matching session format.
// Each line is cols chars where each char is an attribute code:
// '0' = normal, '1' = inverse, '2' = bold, '4' = underline
export function getAttrLines(grid, rows, cols) {
const result = [];
for (let r = 0; r < rows; r++) {
let attrLine = '';
for (let c = 0; c < cols; c++) {
attrLine += String(grid[r][c].attr);
}
attrLine = attrLine.padEnd(cols, '0');
result.push(attrLine);
}
return result;
}
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