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Closed
wants to merge 2 commits into from
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Improve bundle size #3

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f2a6ad4
smaller size
Feb 9, 2017
e2efaaf
fix linting
Feb 9, 2017
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50 changes: 17 additions & 33 deletions index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -3,61 +3,45 @@
/* Expose. */
module.exports = parse;

/* Characters */
var dot = '.'.charCodeAt(0);
var hash = '#'.charCodeAt(0);

/* Parse a simple CSS selector into a HAST node. */
function parse(selector) {
var id = null;
var index = 0;
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is there any value? is it so important? it add bytes.

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Using charCodeAt is faster than charCode or bracket notation.
And this is code that could be run a lot, so it could matter a little.

var className = [];
var value = selector || '';
var name = 'div';
var node;
var type = null;
var index = -1;
var code;
var length = value.length;
var subvalue;

var type;
var lastIndex;

node = {
var node = {
type: 'element',
tagName: null,
tagName: 'div',
properties: {},
children: []
};

type = null;
selector = selector || '';

while (++index <= length) {
code = value.charCodeAt(index);
while (index <= selector.length) {
var ch = selector[index++];

if (!code || code === dot || code === hash) {
subvalue = value.slice(lastIndex, index);
if (!ch || ch === '.' || ch === '#') {
var subvalue = selector.slice(lastIndex, index - 1);

if (subvalue) {
if (type === dot) {
if (type === '.') {
className.push(subvalue);
} else if (type === hash) {
id = subvalue;
} else if (type === '#') {
node.properties.id = subvalue;
} else {
name = subvalue;
node.tagName = subvalue;
}
}

lastIndex = index + 1;
type = code;
lastIndex = index;
type = ch;
}
}

node.tagName = name;

if (id) {
node.properties.id = id;
}

if (className.length !== 0) {
if (className.length) { // eslint-disable-line unicorn/explicit-length-check
node.properties.className = className;
}

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