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author | Dimitri Staessens <dimitri@ouroboros.rocks> | 2019-10-06 21:37:45 +0200 |
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committer | Dimitri Staessens <dimitri@ouroboros.rocks> | 2019-10-06 21:37:45 +0200 |
commit | 3c51c3be85bb0d1bdb87ea0d6632f1c256912f27 (patch) | |
tree | c7ccc8279b12c4f7bdbbb4270d617e48f51722e4 /node_modules/wrap-ansi/index.js | |
parent | 412c104bebc507bea9c94fd53b5bdc4b64cbfe31 (diff) | |
download | website-3c51c3be85bb0d1bdb87ea0d6632f1c256912f27.tar.gz website-3c51c3be85bb0d1bdb87ea0d6632f1c256912f27.zip |
build: Add some required modules for node
Diffstat (limited to 'node_modules/wrap-ansi/index.js')
-rwxr-xr-x | node_modules/wrap-ansi/index.js | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/node_modules/wrap-ansi/index.js b/node_modules/wrap-ansi/index.js new file mode 100755 index 0000000..ff62543 --- /dev/null +++ b/node_modules/wrap-ansi/index.js @@ -0,0 +1,168 @@ +'use strict'; +var stringWidth = require('string-width'); +var stripAnsi = require('strip-ansi'); + +var ESCAPES = [ + '\u001b', + '\u009b' +]; + +var END_CODE = 39; + +var ESCAPE_CODES = { + 0: 0, + 1: 22, + 2: 22, + 3: 23, + 4: 24, + 7: 27, + 8: 28, + 9: 29, + 30: 39, + 31: 39, + 32: 39, + 33: 39, + 34: 39, + 35: 39, + 36: 39, + 37: 39, + 90: 39, + 40: 49, + 41: 49, + 42: 49, + 43: 49, + 44: 49, + 45: 49, + 46: 49, + 47: 49 +}; + +function wrapAnsi(code) { + return ESCAPES[0] + '[' + code + 'm'; +} + +// calculate the length of words split on ' ', ignoring +// the extra characters added by ansi escape codes. +function wordLengths(str) { + return str.split(' ').map(function (s) { + return stringWidth(s); + }); +} + +// wrap a long word across multiple rows. +// ansi escape codes do not count towards length. +function wrapWord(rows, word, cols) { + var insideEscape = false; + var visible = stripAnsi(rows[rows.length - 1]).length; + + for (var i = 0; i < word.length; i++) { + var x = word[i]; + + rows[rows.length - 1] += x; + + if (ESCAPES.indexOf(x) !== -1) { + insideEscape = true; + } else if (insideEscape && x === 'm') { + insideEscape = false; + continue; + } + + if (insideEscape) { + continue; + } + + visible++; + + if (visible >= cols && i < word.length - 1) { + rows.push(''); + visible = 0; + } + } + + // it's possible that the last row we copy over is only + // ansi escape characters, handle this edge-case. + if (!visible && rows[rows.length - 1].length > 0 && rows.length > 1) { + rows[rows.length - 2] += rows.pop(); + } +} + +// the wrap-ansi module can be invoked +// in either 'hard' or 'soft' wrap mode. +// +// 'hard' will never allow a string to take up more +// than cols characters. +// +// 'soft' allows long words to expand past the column length. +function exec(str, cols, opts) { + var options = opts || {}; + + var pre = ''; + var ret = ''; + var escapeCode; + + var lengths = wordLengths(str); + var words = str.split(' '); + var rows = ['']; + + for (var i = 0, word; (word = words[i]) !== undefined; i++) { + var rowLength = stringWidth(rows[rows.length - 1]); + + if (rowLength) { + rows[rows.length - 1] += ' '; + rowLength++; + } + + // in 'hard' wrap mode, the length of a line is + // never allowed to extend past 'cols'. + if (lengths[i] > cols && options.hard) { + if (rowLength) { + rows.push(''); + } + wrapWord(rows, word, cols); + continue; + } + + if (rowLength + lengths[i] > cols && rowLength > 0) { + if (options.wordWrap === false && rowLength < cols) { + wrapWord(rows, word, cols); + continue; + } + + rows.push(''); + } + + rows[rows.length - 1] += word; + } + + pre = rows.map(function (r) { + return r.trim(); + }).join('\n'); + + for (var j = 0; j < pre.length; j++) { + var y = pre[j]; + + ret += y; + + if (ESCAPES.indexOf(y) !== -1) { + var code = parseFloat(/[0-9][^m]*/.exec(pre.slice(j, j + 4))); + escapeCode = code === END_CODE ? null : code; + } + + if (escapeCode && ESCAPE_CODES[escapeCode]) { + if (pre[j + 1] === '\n') { + ret += wrapAnsi(ESCAPE_CODES[escapeCode]); + } else if (y === '\n') { + ret += wrapAnsi(escapeCode); + } + } + } + + return ret; +} + +// for each line break, invoke the method separately. +module.exports = function (str, cols, opts) { + return String(str).split('\n').map(function (substr) { + return exec(substr, cols, opts); + }).join('\n'); +}; |