60 lines
1.5 KiB
JavaScript
60 lines
1.5 KiB
JavaScript
/**
|
|
* An ES6 string tag that fixes indentation. Also removes leading newlines
|
|
* and trailing spaces and tabs, but keeps trailing newlines.
|
|
*
|
|
* Example usage:
|
|
* const str = dedent`
|
|
* {
|
|
* test
|
|
* }
|
|
* `;
|
|
* str === "{\n test\n}\n";
|
|
*/
|
|
export default function dedent(strings) {
|
|
var str = '';
|
|
|
|
for (var i = 0; i < strings.length; ++i) {
|
|
str += strings[i];
|
|
|
|
if (i < (arguments.length <= 1 ? 0 : arguments.length - 1)) {
|
|
str += i + 1 < 1 || arguments.length <= i + 1 ? undefined : arguments[i + 1]; // interpolation
|
|
}
|
|
}
|
|
|
|
var trimmedStr = str.replace(/^\n*/m, '') // remove leading newline
|
|
.replace(/[ \t]*$/, ''); // remove trailing spaces and tabs
|
|
// fixes indentation by removing leading spaces and tabs from each line
|
|
|
|
var indent = '';
|
|
var _iteratorNormalCompletion = true;
|
|
var _didIteratorError = false;
|
|
var _iteratorError = undefined;
|
|
|
|
try {
|
|
for (var _iterator = trimmedStr[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
|
|
var char = _step.value;
|
|
|
|
if (char !== ' ' && char !== '\t') {
|
|
break;
|
|
}
|
|
|
|
indent += char;
|
|
}
|
|
} catch (err) {
|
|
_didIteratorError = true;
|
|
_iteratorError = err;
|
|
} finally {
|
|
try {
|
|
if (!_iteratorNormalCompletion && _iterator.return != null) {
|
|
_iterator.return();
|
|
}
|
|
} finally {
|
|
if (_didIteratorError) {
|
|
throw _iteratorError;
|
|
}
|
|
}
|
|
}
|
|
|
|
return trimmedStr.replace(RegExp('^' + indent, 'mg'), ''); // remove indent
|
|
}
|