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/** @import { ValidatedCompileOptions, Css } from '#compiler' */
/** @import { ComponentAnalysis } from '../../types.js' */
import MagicString from 'magic-string';
import { walk } from 'zimmerframe';
import { is_keyframes_node, regex_css_name_boundary, remove_css_prefix } from '../../css.js';
import { merge_with_preprocessor_map } from '../../../utils/mapped_code.js';
/**
* @typedef {{
* code: MagicString;
* dev: boolean;
* hash: string;
* selector: string;
* keyframes: string[];
* specificity: {
* bumped: boolean
* }
* }} State
*/
/**
*
* @param {string} source
* @param {ComponentAnalysis} analysis
* @param {ValidatedCompileOptions} options
*/
export function render_stylesheet(source, analysis, options) {
const code = new MagicString(source);
/** @type {State} */
const state = {
code,
dev: options.dev,
hash: analysis.css.hash,
selector: `.${analysis.css.hash}`,
keyframes: analysis.css.keyframes,
specificity: {
bumped: false
}
};
const ast = /** @type {Css.StyleSheet} */ (analysis.css.ast);
walk(/** @type {Css.Node} */ (ast), state, visitors);
code.remove(0, ast.content.start);
code.remove(/** @type {number} */ (ast.content.end), source.length);
const css = {
code: code.toString(),
map: code.generateMap({
// include source content; makes it easier/more robust looking up the source map code
includeContent: true,
// generateMap takes care of calculating source relative to file
source: options.filename,
file: options.cssOutputFilename || options.filename
})
};
merge_with_preprocessor_map(css, options, css.map.sources[0]);
if (options.dev && options.css === 'injected' && css.code) {
css.code += `\n/*# sourceMappingURL=${css.map.toUrl()} */`;
}
return css;
}
/** @type {Visitors<Css.Node, State>} */
const visitors = {
_: (node, context) => {
context.state.code.addSourcemapLocation(node.start);
context.state.code.addSourcemapLocation(node.end);
context.next();
},
Atrule(node, { state, next }) {
if (is_keyframes_node(node)) {
let start = node.start + node.name.length + 1;
while (state.code.original[start] === ' ') start += 1;
let end = start;
while (state.code.original[end] !== '{' && state.code.original[end] !== ' ') end += 1;
if (node.prelude.startsWith('-global-')) {
state.code.remove(start, start + 8);
} else {
state.code.prependRight(start, `${state.hash}-`);
}
return; // don't transform anything within
}
next();
},
Declaration(node, { state, next }) {
const property = node.property && remove_css_prefix(node.property.toLowerCase());
if (property === 'animation' || property === 'animation-name') {
let index = node.start + node.property.length + 1;
let name = '';
while (index < state.code.original.length) {
const character = state.code.original[index];
if (regex_css_name_boundary.test(character)) {
if (state.keyframes.includes(name)) {
state.code.prependRight(index - name.length, `${state.hash}-`);
}
if (character === ';' || character === '}') {
break;
}
name = '';
} else {
name += character;
}
index++;
}
}
},
Rule(node, { state, next, visit }) {
// keep empty rules in dev, because it's convenient to
// see them in devtools
if (!state.dev && is_empty(node)) {
state.code.prependRight(node.start, '/* (empty) ');
state.code.appendLeft(node.end, '*/');
escape_comment_close(node, state.code);
return;
}
if (!is_used(node)) {
state.code.prependRight(node.start, '/* (unused) ');
state.code.appendLeft(node.end, '*/');
escape_comment_close(node, state.code);
return;
}
if (node.metadata.is_global_block) {
const selector = node.prelude.children[0];
if (selector.children.length === 1) {
// `:global {...}`
state.code.prependRight(node.start, '/* ');
state.code.appendLeft(node.block.start + 1, '*/');
state.code.prependRight(node.block.end - 1, '/*');
state.code.appendLeft(node.block.end, '*/');
// don't recurse into selector or body
return;
}
// don't recurse into body
visit(node.prelude);
return;
}
next();
},
SelectorList(node, { state, next, path }) {
let pruning = false;
let last = node.children[0].start;
for (let i = 0; i < node.children.length; i += 1) {
const selector = node.children[i];
if (selector.metadata.used === pruning) {
if (pruning) {
let i = selector.start;
while (state.code.original[i] !== ',') i--;
state.code.overwrite(i, i + 1, '*/');
} else {
if (i === 0) {
state.code.prependRight(selector.start, '/* (unused) ');
} else {
state.code.overwrite(last, selector.start, ' /* (unused) ');
}
}
pruning = !pruning;
}
last = selector.end;
}
if (pruning) {
state.code.appendLeft(last, '*/');
}
// if we're in a `:is(...)` or whatever, keep existing specificity bump state
let specificity = state.specificity;
// if this selector list belongs to a rule, require a specificity bump for the
// first scoped selector but only if we're at the top level
let parent = path.at(-1);
if (parent?.type === 'Rule') {
specificity = { bumped: false };
/** @type {Css.Rule | null} */
let rule = parent.metadata.parent_rule;
while (rule) {
if (rule.metadata.has_local_selectors) {
specificity = { bumped: true };
break;
}
rule = rule.metadata.parent_rule;
}
}
next({ ...state, specificity });
},
ComplexSelector(node, context) {
const before_bumped = context.state.specificity.bumped;
/** @param {Css.SimpleSelector} selector */
function remove_global_pseudo_class(selector) {
context.state.code
.remove(selector.start, selector.start + ':global('.length)
.remove(selector.end - 1, selector.end);
}
for (const relative_selector of node.children) {
if (relative_selector.metadata.is_global) {
remove_global_pseudo_class(relative_selector.selectors[0]);
continue;
}
if (relative_selector.metadata.scoped) {
if (relative_selector.selectors.length === 1) {
// skip standalone :is/:where/& selectors
const selector = relative_selector.selectors[0];
if (
selector.type === 'PseudoClassSelector' &&
(selector.name === 'is' || selector.name === 'where')
) {
continue;
}
}
// for any :global() at the middle of compound selector
for (const selector of relative_selector.selectors) {
if (selector.type === 'PseudoClassSelector' && selector.name === 'global') {
remove_global_pseudo_class(selector);
}
}
if (relative_selector.selectors.some((s) => s.type === 'NestingSelector')) {
continue;
}
// for the first occurrence, we use a classname selector, so that every
// encapsulated selector gets a +0-1-0 specificity bump. thereafter,
// we use a `:where` selector, which does not affect specificity
let modifier = context.state.selector;
if (context.state.specificity.bumped) modifier = `:where(${modifier})`;
context.state.specificity.bumped = true;
let i = relative_selector.selectors.length;
while (i--) {
const selector = relative_selector.selectors[i];
if (
selector.type === 'PseudoElementSelector' ||
selector.type === 'PseudoClassSelector'
) {
if (selector.name !== 'root' && selector.name !== 'host') {
if (i === 0) context.state.code.prependRight(selector.start, modifier);
}
continue;
}
if (selector.type === 'TypeSelector' && selector.name === '*') {
context.state.code.update(selector.start, selector.end, modifier);
} else {
context.state.code.appendLeft(selector.end, modifier);
}
break;
}
}
}
context.next();
context.state.specificity.bumped = before_bumped;
},
PseudoClassSelector(node, context) {
if (node.name === 'is' || node.name === 'where') {
context.next();
}
}
};
/** @param {Css.Rule} rule */
function is_empty(rule) {
if (rule.metadata.is_global_block) {
return rule.block.children.length === 0;
}
for (const child of rule.block.children) {
if (child.type === 'Declaration') {
return false;
}
if (child.type === 'Rule') {
if (is_used(child) && !is_empty(child)) return false;
}
if (child.type === 'Atrule') {
return false; // TODO
}
}
return true;
}
/** @param {Css.Rule} rule */
function is_used(rule) {
for (const selector of rule.prelude.children) {
if (selector.metadata.used) return true;
}
for (const child of rule.block.children) {
if (child.type === 'Rule' && is_used(child)) return true;
if (child.type === 'Atrule') {
return true; // TODO
}
}
return false;
}
/**
*
* @param {Css.Rule} node
* @param {MagicString} code
*/
function escape_comment_close(node, code) {
let escaped = false;
let in_comment = false;
for (let i = node.start; i < node.end; i++) {
if (escaped) {
escaped = false;
} else {
const char = code.original[i];
if (in_comment) {
if (char === '*' && code.original[i + 1] === '/') {
code.prependRight(++i, '\\');
in_comment = false;
}
} else if (char === '\\') {
escaped = true;
} else if (char === '/' && code.original[++i] === '*') {
in_comment = true;
}
}
}
}
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