scroll/demo/colors.ts

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/**
* This is a test file and a terminal color table program
*/
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import Ansi, { AnsiColor, Ground } from '../src/common/ansi.ts';
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// ----------------------------------------------------------------------------
// Display table of the 256 type color console escape codes
// ----------------------------------------------------------------------------
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const addColor = (fore: string, back: string): string => {
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let output = '';
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output += fore;
output += back;
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return output;
};
const padNum = (num: number): string =>
String(num).padStart(3, ' ').padEnd(5, ' ');
const colorBlock = (
start: number,
end: number,
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block: (i: number) => [string, string],
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): string => {
let output = '';
for (let i = start; i < end; i++) {
const [fg, bg] = block(i);
output += addColor(fg, bg);
output += padNum(i);
output += Ansi.ResetFormatting;
}
return output;
};
function print16colorTable(): void {
const drawRow = (start: number): string => {
let end = start + 8;
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let blocks = [
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colorBlock(
start,
end,
(i: number) => [Ansi.textFormat(i), Ansi.color.background.Black],
),
colorBlock(
start,
end,
(i: number) => [Ansi.textFormat(i), Ansi.color.background.BrightWhite],
),
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];
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start += 10;
end += 10;
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blocks.push(
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colorBlock(
start,
end,
(i: number) => [Ansi.color.Black, Ansi.textFormat(i)],
),
);
blocks.push(
colorBlock(
start,
end,
(i: number) => [Ansi.color.BrightWhite, Ansi.textFormat(i)],
),
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);
return blocks.join(' '.repeat(5));
};
let colorTable = [
drawRow(30),
drawRow(90),
].join('\n');
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colorTable += '\n';
console.log(colorTable);
}
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function print256colorTable(): void {
let colorTable = '';
// deno-fmt-ignore
const breaks = [
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7, 15,
21, 27, 33, 39, 45, 51,
57, 63, 69, 75, 81, 87,
93, 99, 105, 111, 117, 123,
129, 135, 141, 147, 153, 159,
165, 171, 177, 183, 189, 195,
201, 207, 213, 219, 225, 231,
237, 243, 249, 255,
];
const doubleBreaks = [15, 51, 87, 123, 159, 195, 231, 255];
breaks.forEach((line, n) => {
const start = (n > 0) ? breaks[n - 1] + 1 : 0;
const end = line + 1;
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const blocks = [
colorBlock(
start,
end,
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(
i: number,
) => [Ansi.color256(i, Ground.Fore), Ansi.color.background.Black],
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),
colorBlock(
start,
end,
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(
i: number,
) => [Ansi.color256(i, Ground.Fore), Ansi.color.background.BrightWhite],
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),
colorBlock(
start,
end,
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(i: number) => [Ansi.color.Black, Ansi.color256(i, Ground.Back)],
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),
colorBlock(
start,
end,
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(i: number) => [Ansi.color.BrightWhite, Ansi.color256(i, Ground.Back)],
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),
];
colorTable += blocks.join(' '.repeat(5));
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colorTable += '\n';
if (doubleBreaks.includes(line)) {
colorTable += '\n';
}
});
console.log(colorTable);
}
print16colorTable();
print256colorTable();
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/**
* Test code for highlighting
*/
const decimal: number[] = [0, 117];
const bigDecimal = 123456789123456789n;
const octal: number[] = [0o15, 0o1];
const bigOctal = 0o777777777777n;
const hexadecimal: number[] = [0x1123, 0x00111];
const bigHex = 0x123456789ABCDEFn;
const binary: number[] = [0b11, 0b0011];
const bigBinary = 0b11101001010101010101n;