mirror of
https://github.com/idanoo/GoScrobble.git
synced 2024-11-25 09:55:15 +00:00
34 lines
981 B
JavaScript
34 lines
981 B
JavaScript
|
// Can unquote attribute detection
|
||
|
|
// Adopted implementation of Mathias Bynens
|
||
|
|
// https://github.com/mathiasbynens/mothereff.in/blob/master/unquoted-attributes/eff.js
|
||
|
|
var escapesRx = /\\([0-9A-Fa-f]{1,6})(\r\n|[ \t\n\f\r])?|\\./g;
|
||
|
|
var blockUnquoteRx = /^(-?\d|--)|[\u0000-\u002c\u002e\u002f\u003A-\u0040\u005B-\u005E\u0060\u007B-\u009f]/;
|
||
|
|
|
||
|
|
function canUnquote(value) {
|
||
|
|
if (value === '' || value === '-') {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Escapes are valid, so replace them with a valid non-empty string
|
||
|
|
value = value.replace(escapesRx, 'a');
|
||
|
|
|
||
|
|
return !blockUnquoteRx.test(value);
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = function(node) {
|
||
|
|
var attrValue = node.value;
|
||
|
|
|
||
|
|
if (!attrValue || attrValue.type !== 'String') {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
var unquotedValue = attrValue.value.replace(/^(.)(.*)\1$/, '$2');
|
||
|
|
if (canUnquote(unquotedValue)) {
|
||
|
|
node.value = {
|
||
|
|
type: 'Identifier',
|
||
|
|
loc: attrValue.loc,
|
||
|
|
name: unquotedValue
|
||
|
|
};
|
||
|
|
}
|
||
|
|
};
|