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/**
* @author Titus Wormer
* @copyright 2015 Titus Wormer
* @license MIT
* @module remark:parse:util:remove-indentation
* @fileoverview Remove indentation.
*/
'use strict';
/* Dependencies. */
var trim = require('trim');
var repeat = require('repeat-string');
var getIndent = require('./get-indentation');
/* Expose. */
module.exports = indentation;
/* Characters. */
var C_SPACE = ' ';
var C_NEWLINE = '\n';
var C_TAB = '\t';
/**
* Remove the minimum indent from every line in `value`.
* Supports both tab, spaced, and mixed indentation (as
* well as possible).
*
* @example
* removeIndentation(' foo'); // 'foo'
* removeIndentation(' foo', 2); // ' foo'
* removeIndentation('\tfoo', 2); // ' foo'
* removeIndentation(' foo\n bar'); // ' foo\n bar'
*
* @param {string} value - Value to trim.
* @param {number?} [maximum] - Maximum indentation
* to remove.
* @return {string} - Unindented `value`.
*/
function indentation(value, maximum) {
var values = value.split(C_NEWLINE);
var position = values.length + 1;
var minIndent = Infinity;
var matrix = [];
var index;
var indentation;
var stops;
var padding;
values.unshift(repeat(C_SPACE, maximum) + '!');
while (position--) {
indentation = getIndent(values[position]);
matrix[position] = indentation.stops;
if (trim(values[position]).length === 0) {
continue;
}
if (indentation.indent) {
if (indentation.indent > 0 && indentation.indent < minIndent) {
minIndent = indentation.indent;
}
} else {
minIndent = Infinity;
break;
}
}
if (minIndent !== Infinity) {
position = values.length;
while (position--) {
stops = matrix[position];
index = minIndent;
while (index && !(index in stops)) {
index--;
}
if (
trim(values[position]).length !== 0 &&
minIndent &&
index !== minIndent
) {
padding = C_TAB;
} else {
padding = '';
}
values[position] = padding + values[position].slice(
index in stops ? stops[index] + 1 : 0
);
}
}
values.shift();
return values.join(C_NEWLINE);
}
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