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'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');
};
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