diff options
Diffstat (limited to 'ansi.js')
| -rw-r--r-- | ansi.js | 257 |
1 files changed, 0 insertions, 257 deletions
diff --git a/ansi.js b/ansi.js deleted file mode 100644 index 1f9a392..0000000 --- a/ansi.js +++ /dev/null @@ -1,257 +0,0 @@ -const ESC = '\x1b' - -const isDigit = char => '0123456789'.indexOf(char) >= 0 - -const ansi = { - ESC, - - // Attributes - A_RESET: 0, - A_BRIGHT: 1, - A_DIM: 2, - A_INVERT: 7, - C_BLACK: 30, - C_RED: 31, - C_GREEN: 32, - C_YELLOW: 33, - C_BLUE: 34, - C_MAGENTA: 35, - C_CYAN: 36, - C_WHITE: 37, - C_RESET: 39, - - clearScreen() { - // Clears the screen, removing any characters displayed, and resets the - // cursor position. - - return `${ESC}[2J` - }, - - moveCursorRaw(line, col) { - // Moves the cursor to the given line and column on the screen. - // Returns the pure ANSI code, with no modification to line or col. - - return `${ESC}[${line};${col}H` - }, - - moveCursor(line, col) { - // Moves the cursor to the given line and column on the screen. - // Note that since in JavaScript indexes start at 0, but in ANSI codes - // the top left of the screen is (1, 1), this function adjusts the - // arguments to act as if the top left of the screen is (0, 0). - - return `${ESC}[${line + 1};${col + 1}H` - }, - - hideCursor() { - // Makes the cursor invisible. - - return `${ESC}[?25l` - }, - - showCursor() { - // Makes the cursor visible. - - return `${ESC}[?25h` - }, - - resetAttributes() { - // Resets all attributes, including text decorations, foreground and - // background color. - - return `${ESC}[0m` - }, - - setAttributes(attrs) { - // Set some raw attributes. See the attributes section of the ansi.js - // source code for attributes that can be used with this; A_RESET resets - // all attributes. - - return `${ESC}[${attrs.join(';')}m` - }, - - setForeground(color) { - // Sets the foreground color to print text with. See C_(COLOR) for colors - // that can be used with this; C_RESET resets the foreground. - // - // If null or undefined is passed, this function will return a blank - // string (no ANSI escape codes). - - if (typeof color === 'undefined' || color === null) { - return '' - } - - return ansi.setAttributes([color]) - }, - - invert() { - // Inverts the foreground and background colors. - - return `${ESC}[7m` - }, - - - - interpret(text, scrRows, scrCols) { - // Interprets the given ansi code, more or less. - - const blank = { - attributes: [], - char: ' ' - } - - const chars = new Array(scrRows * scrCols).fill(blank) - - let cursorRow = 1 - let cursorCol = 1 - const attributes = [] - const getCursorIndex = () => (cursorRow - 1) * scrCols + (cursorCol - 1) - - for (let charI = 0; charI < text.length; charI++) { - if (text[charI] === ESC) { - charI++ - - if (text[charI] !== '[') { - throw new Error('ESC not followed by [') - } - - charI++ - - const args = [] - let val = '' - while (isDigit(text[charI])) { - val += text[charI] - charI++ - - if (text[charI] === ';') { - charI++ - args.push(val) - val = '' - continue - } - } - args.push(val) - - // CUP - Cursor Position (moveCursor) - if (text[charI] === 'H') { - cursorRow = args[0] - cursorCol = args[1] - } - - // ED - Erase Display (clearScreen) - if (text[charI] === 'J') { - // ESC[2J - erase whole display - if (args[0] === '2') { - chars.fill(blank) - charI += 3 - cursorCol = 1 - cursorRow = 1 - } - - // ESC[1J - erase to beginning - else if (args[0] === '1') { - for (let i = 0; i < getCursorIndex(); i++) { - chars[i] = blank - } - } - - // ESC[0J - erase to end - else if (args.length === 0 || args[0] === '0') { - for (let i = getCursorIndex(); i < chars.length; i++) { - chars[i] = blank - } - } - } - - // SGR - Select Graphic Rendition - if (text[charI] === 'm') { - for (let arg of args) { - if (arg === '0') { - attributes.splice(0, attributes.length) - } else { - attributes.push(arg) - } - } - } - - continue - } - - // debug - /* - if (text[charI] === '.') { - console.log( - `#1-char "${text[charI]}" at ` + - `(${cursorRow},${cursorCol}):${getCursorIndex()} ` + - ` attr:[${attributes.join(';')}]` - ) - } - */ - - chars[getCursorIndex()] = { - char: text[charI], - attributes: attributes.slice() - } - - cursorCol++ - - if (cursorCol > scrCols) { - cursorCol = 1 - cursorRow++ - } - } - - // Character concatenation ----------- - - // Move to the top left of the screen initially. - const result = [ ansi.moveCursorRaw(1, 1) ] - - let lastChar = { - char: '', - attributes: [] - } - - //let n = 1 // debug - - for (let char of chars) { - const newAttributes = ( - char.attributes.filter(attr => !(lastChar.attributes.includes(attr))) - ) - - const removedAttributes = ( - lastChar.attributes.filter(attr => !(char.attributes.includes(attr))) - ) - - // The only way to practically remove any character attribute is to - // reset all of its attributes and then re-add its existing attributes. - // If we do that, there's no need to add new attributes. - if (removedAttributes.length) { - // console.log( - // `removed some attributes "${char.char}"`, removedAttributes - // ) - result.push(ansi.resetAttributes()) - result.push(`${ESC}[${char.attributes.join(';')}m`) - } else if (newAttributes.length) { - result.push(`${ESC}[${newAttributes.join(';')}m`) - } - - // debug - /* - if (char.char !== ' ') { - console.log( - `#2-char ${char.char}; ${chars.indexOf(char) - n} inbetween` - ) - n = chars.indexOf(char) - } - */ - - result.push(char.char) - - lastChar = char - } - - return result.join('') - } -} - -module.exports = ansi |