aaac7fed
 liuqimichale
add
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// 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})[ \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',
info: attrValue.info,
name: unquotedValue
};
}
};
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