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feat: juice ignore comments
1 parent a0ed51e commit ce49f21

3 files changed

Lines changed: 396 additions & 8 deletions

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‎README.md‎

Lines changed: 82 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -225,6 +225,88 @@ The `data-embed` attribute will be removed from the output HTML, but no inlining
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</style>
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```
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### Ignoring CSS with comments
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You can use special CSS comments to prevent Juice from inlining entire CSS files, rules, or even just declarations.
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#### Ignore entire file
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Add a `/* juice ignore */` comment on the first line in your CSS:
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```html
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<style>
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/* juice ignore */
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body { color: red; }
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.test { color: blue; }
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</style>
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<body>
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<div class="test">Hello World</div>
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</body>
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```
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The entire CSS will be ignored (as in, not inlined).
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With `removeStyleTags: true`, the whole `<style>` tag will be preserved.
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#### Ignore next rule
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Add `/* juice ignore next */` before any CSS rule to skip inlining that rule:
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```css
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body { color: black; }
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/* juice ignore next */
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h1 {
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color: blue;
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}
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p { color: green; }
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```
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The `h1` rule will not be inlined, but will be preserved when `removeStyleTags: true`. The `body` and `p` rules will be inlined normally.
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#### Ignore next declaration
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Add `/* juice ignore next */` inside a CSS rule to skip inlining the next declaration:
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```css
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.test {
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color: red;
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/* juice ignore next */
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font-weight: bold;
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font-size: 14px;
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}
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```
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The `color` and `font-size` will be inlined, but `font-weight` will not. The rule with the ignored declaration will be preserved in a `<style>` tag when `removeStyleTags: true`.
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#### Ignore blocks of code
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Use start/end comment pairs to ignore multiple rules:
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```css
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h1 {
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color: black;
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}
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/* juice start ignore */
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h2 {
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color: pink;
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}
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h3 {
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color: lightcoral;
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}
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/* juice end ignore */
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h4 {
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color: green;
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}
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```
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The `h2` and `h3` rules will not be inlined but will be preserved in a `<style>` tag when `removeStyleTags: true`. The `h1` and `h4` rules will be inlined normally.
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### CLI Options
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To use Juice from CLI, run `juice [options] input.html output.html`

‎lib/utils.js‎

Lines changed: 164 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -60,14 +60,81 @@ exports.parseCSS = function(css) {
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var parsed = mensch.parse(css, {position: true, comments: true});
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var rules = typeof parsed.stylesheet != 'undefined' && parsed.stylesheet.rules ? parsed.stylesheet.rules : [];
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var ret = [];
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var ignoring = false;
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var ignoreEntireFile = false;
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// Check if the first rule is a comment that ignores the entire file
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if (rules.length > 0 && rules[0].type === 'comment' && rules[0].text) {
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var firstComment = rules[0].text.trim();
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if (firstComment === 'juice ignore') {
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ignoreEntireFile = true;
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}
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}
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if (ignoreEntireFile) {
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return ret;
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}
6377

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for (var i = 0, l = rules.length; i < l; i++) {
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// Handle comments for ignore directives
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if (rules[i].type === 'comment') {
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if (!rules[i].text) {
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continue;
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}
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var comment = rules[i].text.trim();
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if (comment === 'juice start ignore') {
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ignoring = true;
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} else if (comment === 'juice end ignore') {
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ignoring = false;
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} else if (comment === 'juice ignore next') {
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// Skip the next rule
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i++;
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}
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continue;
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}
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// Skip rules if we're in an ignore block
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if (ignoring) {
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continue;
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}
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if (rules[i].type == 'rule') {
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var rule = rules[i];
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var selectors = rule.selectors;
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69-
for (var ii = 0, ll = selectors.length; ii < ll; ii++) {
70-
ret.push([selectors[ii], rule.declarations]);
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// Check if this rule has 'juice ignore next' in its declarations
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// If so, we need to skip specific declarations that follow the comment
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var filteredDeclarations = [];
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if (rule.declarations) {
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var skipNext = false;
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for (var d = 0; d < rule.declarations.length; d++) {
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var decl = rule.declarations[d];
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if (decl.type === 'comment' && decl.text) {
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var declComment = decl.text.trim();
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if (declComment === 'juice ignore next') {
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skipNext = true;
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continue;
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}
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}
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if (skipNext && decl.type === 'property') {
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skipNext = false;
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continue;
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}
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if (decl.type === 'property') {
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filteredDeclarations.push(decl);
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}
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}
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}
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// Only add rule if it has declarations after filtering
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if (filteredDeclarations.length > 0) {
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for (var ii = 0, ll = selectors.length; ii < ll; ii++) {
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ret.push([selectors[ii], filteredDeclarations]);
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}
71138
}
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}
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}
@@ -88,20 +155,109 @@ exports.getPreservedText = function(css, options, ignoredPseudos) {
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var rules = typeof parsed.stylesheet != 'undefined' && parsed.stylesheet.rules ? parsed.stylesheet.rules : [];
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var preserved = [];
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var lastStart = null;
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var ignoring = false;
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var ignoreBlock = [];
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var ignoreEntireFile = false;
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var ignoredRuleIndices = new Set();
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// Check if the first rule is a comment that ignores the entire file
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if (rules.length > 0 && rules[0].type === 'comment' && rules[0].text) {
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var firstComment = rules[0].text.trim();
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if (firstComment === 'juice ignore') {
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ignoreEntireFile = true;
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}
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}
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// If ignoring entire file, preserve everything
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if (ignoreEntireFile) {
173+
return '\n' + css + '\n';
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}
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// First pass: identify rules to ignore/preserve (forward iteration for "ignore next")
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for (var i = 0; i < rules.length; i++) {
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if (rules[i].type === 'comment' && rules[i].text) {
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var comment = rules[i].text.trim();
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if (comment === 'juice ignore next' && i + 1 < rules.length) {
181+
ignoredRuleIndices.add(i + 1);
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}
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}
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// Also check for declarations with "juice ignore next"
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if (rules[i].type === 'rule' && rules[i].declarations) {
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for (var d = 0; d < rules[i].declarations.length; d++) {
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if (rules[i].declarations[d].type === 'comment' && rules[i].declarations[d].text) {
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var declComment = rules[i].declarations[d].text.trim();
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if (declComment === 'juice ignore next') {
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ignoredRuleIndices.add(i);
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break;
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}
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}
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}
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}
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}
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// Second pass: process rules (backward iteration for proper order)
92200
for (var i = rules.length - 1; i >= 0; i--) {
93-
if ((options.fontFaces && rules[i].type === 'font-face') ||
94-
(options.mediaQueries && rules[i].type === 'media') ||
95-
(options.keyFrames && rules[i].type === 'keyframes') ||
96-
(options.pseudos && rules[i].selectors && this.matchesPseudo(rules[i].selectors[0], ignoredPseudos))) {
201+
var rule = rules[i];
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// Handle juice ignore comments
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if (rule.type === 'comment') {
205+
if (!rule.text) {
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continue;
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}
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var comment = rule.text.trim();
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if (comment === 'juice end ignore') {
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ignoring = true;
212+
ignoreBlock.push(rule);
213+
} else if (comment === 'juice start ignore') {
214+
ignoring = false;
215+
ignoreBlock.push(rule);
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// Stringify the entire ignore block
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if (ignoreBlock.length > 0) {
218+
preserved.unshift(
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mensch.stringify(
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{ stylesheet: { rules: ignoreBlock.reverse() } },
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{ comments: true, indentation: ' ' }
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)
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);
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ignoreBlock = [];
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}
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}
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// Skip "juice ignore next" comments themselves
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continue;
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}
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// If we're in an ignore block, collect the rules
232+
if (ignoring) {
233+
ignoreBlock.push(rule);
234+
continue;
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}
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// Check if this rule was marked to be ignored
238+
if (ignoredRuleIndices.has(i)) {
239+
preserved.unshift(
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mensch.stringify(
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{ stylesheet: { rules: [rule] } },
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{ comments: true, indentation: ' ' }
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)
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);
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continue;
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}
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// Original preserve logic
249+
if ((options.fontFaces && rule.type === 'font-face') ||
250+
(options.mediaQueries && rule.type === 'media') ||
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(options.keyFrames && rule.type === 'keyframes') ||
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(options.pseudos && rule.selectors && this.matchesPseudo(rule.selectors[0], ignoredPseudos))) {
97253
preserved.unshift(
98254
mensch.stringify(
99-
{ stylesheet: { rules: [ rules[i] ] }},
255+
{ stylesheet: { rules: [rule] } },
100256
{ comments: false, indentation: ' ' }
101257
)
102258
);
103259
}
104-
lastStart = rules[i].position.start;
260+
lastStart = rule.position.start;
105261
}
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107263
if (preserved.length === 0) {

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