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* Shared CSS extraction helpers for the theme-regression audit.
*
* Everything here operates on a flattened PostCSS root (after `@import` +
* nesting resolution), so selectors are fully expanded and decls are grouped
* exactly as they would render. Kept dependency-light and side-effect-free
* so it can run in either Node or the browser.
*/
import postcss, { type Root, type AcceptedPlugin } from 'postcss';
import postcssAtImport from 'postcss-import';
import postcssNested from 'postcss-nested';
import postcssRemoveComments from 'postcss-discard-comments';
import type { DeclModel, MotionSignals, Specificity, ThemeAssignmentsBlock } from './types.js';
/** PostCSS plugin chain that flattens a CSS file to a single-level AST (with `@import` resolution). */
export const flattenPlugins: AcceptedPlugin[] = [
postcssAtImport({ cache: false }),
postcssRemoveComments(),
postcssNested(),
];
/**
* Plugin chain that flattens in-memory CSS strings without touching the
* filesystem — used by {@link loadModelsFromStrings} in `models.ts` and by
* any browser-side audit path.
*/
export const stringFlattenPlugins: AcceptedPlugin[] = [postcssRemoveComments(), postcssNested()];
/** Matches every `--slds-c-*` token reference in a declaration value. */
export const HOOK_TOKEN_RE = /--slds-c-[a-z0-9-]+/gi;
/** Matches a custom property whose name is a component hook. */
export const HOOK_PROP_RE = /^--slds-c-[a-z0-9-]+$/i;
/** Matches any `--slds-*` token reference (component, shared, global, raw). */
export const ANY_TOKEN_RE = /--slds-[a-z]-[a-z0-9-]+/gi;
/**
* Run the filesystem-aware flatten pipeline on raw CSS text.
*
* @param css Raw CSS source.
* @param fromPath Absolute path used for `@import` resolution.
*/
export async function flattenCss(css: string, fromPath: string): Promise<Root> {
const result = await postcss(flattenPlugins).process(css, { from: fromPath });
return result.root;
}
/**
* Flatten a raw CSS string without resolving `@import`s. Suitable for
* already-flattened input (e.g. theme build output, browser fixtures).
*/
export async function flattenCssString(css: string): Promise<Root> {
const result = await postcss(stringFlattenPlugins).process(css, {
from: undefined,
});
return result.root;
}
/** Collapse runs of whitespace in a selector to single spaces and trim. */
export function normalizeSelector(sel: string): string {
return String(sel).replace(/\s+/g, ' ').trim();
}
/**
* Split a comma-separated selector list into trimmed members, respecting
* parentheses so things like `:is(a, b)` stay intact.
*/
export function splitSelectorList(selector: string): string[] {
const out: string[] = [];
let depth = 0;
let start = 0;
for (let i = 0; i < selector.length; i++) {
const c = selector[i];
if (c === '(' || c === '[') depth += 1;
else if (c === ')' || c === ']') depth -= 1;
else if (c === ',' && depth === 0) {
out.push(selector.slice(start, i).trim());
start = i + 1;
}
}
out.push(selector.slice(start).trim());
return out.filter(Boolean);
}
/**
* Normalized, sortable key for a selector list — lets us match the "same"
* rule on both sides even when the author re-ordered commas.
*/
export function selectorKey(selector: string): string {
const members = splitSelectorList(normalizeSelector(selector));
return [...members].sort().join(', ');
}
/**
* Compute CSS specificity for a single selector ([ids, classes, types]).
*
* Handles what shows up in SLDS2 component CSS: ids (`#`), classes (`.`),
* attributes (`[...]`), pseudo-classes (`:hover`), pseudo-elements
* (`::before`), type selectors, combinators, and the universal selector.
*
* `:is(...)` / `:where(...)` / `:not(...)` arguments are walked so the
* highest-specificity child contributes (`:where()` contributes zero).
*/
export function computeSpecificity(selector: string): Specificity {
let ids = 0;
let classes = 0;
let types = 0;
const s = String(selector).trim();
let i = 0;
const len = s.length;
const skipParens = (): string => {
let depth = 1;
const start = i;
i += 1;
while (i < len && depth > 0) {
Iif (s[i] === '(') depth += 1;
else if (s[i] === ')') depth -= 1;
i += 1;
}
return s.slice(start + 1, i - 1);
};
const walk = (sub: string, addFn: (a: number, b: number, c: number) => void): void => {
const [a, b, c] = computeSpecificity(sub);
addFn(a, b, c);
};
while (i < len) {
const c = s[i];
if (c === '#') {
i += 1;
while (i < len && /[\w-]/.test(s[i])) i += 1;
ids += 1;
} else if (c === '.') {
i += 1;
while (i < len && /[\w-]/.test(s[i])) i += 1;
classes += 1;
} else if (c === '[') {
while (i < len && s[i] !== ']') i += 1;
Eif (i < len) i += 1;
classes += 1;
} else if (c === ':') {
const isPseudoElement = s[i + 1] === ':';
if (isPseudoElement) i += 2;
else i += 1;
const nameStart = i;
while (i < len && /[\w-]/.test(s[i])) i += 1;
const name = s.slice(nameStart, i).toLowerCase();
if (i < len && s[i] === '(') {
const inner = skipParens();
if (name === 'where') {
// :where() contributes zero.
} else if (name === 'is' || name === 'not' || name === 'has') {
let best: Specificity = [0, 0, 0];
for (const arg of splitSelectorList(inner)) {
const [a, b, c2] = computeSpecificity(arg);
Eif (
a > best[0] ||
(a === best[0] && b > best[1]) ||
(a === best[0] && b === best[1] && c2 > best[2])
) {
best = [a, b, c2];
}
}
ids += best[0];
classes += best[1];
types += best[2];
} else E{
if (isPseudoElement) types += 1;
else classes += 1;
walk(inner, (a, b, c2) => {
ids += a;
classes += b;
types += c2;
});
}
} else {
if (isPseudoElement) types += 1;
else classes += 1;
}
} else if (/[a-zA-Z-]/.test(c)) {
const nameStart = i;
while (i < len && /[\w-]/.test(s[i])) i += 1;
const name = s.slice(nameStart, i);
Eif (name !== '*') types += 1;
} else {
i += 1;
}
}
return [ids, classes, types];
}
/** Compare two specificity triples. `< 0`, `0`, `> 0` mirror `Array.sort`. */
export function compareSpecificity(a: Specificity, b: Specificity): number {
if (a[0] !== b[0]) return a[0] - b[0];
if (a[1] !== b[1]) return a[1] - b[1];
return a[2] - b[2];
}
/** Highest-specificity member of a comma-separated selector list. */
export function maxSpecificity(selector: string): Specificity {
const members = splitSelectorList(normalizeSelector(selector));
let best: Specificity = [0, 0, 0];
for (const m of members) {
const s = computeSpecificity(m);
Eif (compareSpecificity(s, best) > 0) best = s;
}
return best;
}
/**
* Recursively peel `var(--x, …)` until a non-`var()` token remains.
* Returns `null` when the outer value isn't a `var()` expression or the
* chain bottoms out with no terminal.
*
* var(--a, var(--b, transparent)) -> 'transparent'
* var(--a, var(--b)) -> null
* var(--a, 0) -> '0'
* #fff -> null (not a var chain)
*/
export function terminalFallback(rawValue: string | null | undefined): string | null {
let raw = String(rawValue ?? '').trim();
while (raw.startsWith('var(')) {
let depth = 0;
let lastCommaAtDepth1 = -1;
for (let i = 0; i < raw.length; i++) {
const c = raw[i];
if (c === '(') depth += 1;
else if (c === ')') depth -= 1;
else if (c === ',' && depth === 1) lastCommaAtDepth1 = i;
}
if (lastCommaAtDepth1 === -1) return null;
let tail = raw.slice(lastCommaAtDepth1 + 1).trim();
Eif (tail.endsWith(')')) tail = tail.slice(0, -1).trim();
if (!tail.startsWith('var(')) return tail || null;
raw = tail;
}
return null;
}
/**
* Ordered list of `var()` token refs in a declaration value, outermost
* first. Returns every `--slds-*` token, not just component hooks.
*/
export function extractVarChain(rawValue: string | null | undefined): string[] {
const chain: string[] = [];
let raw = String(rawValue ?? '').trim();
while (raw.startsWith('var(')) {
const m = raw.match(/^var\(\s*(--[a-z0-9-]+)/i);
Iif (!m) break;
chain.push(m[1]);
let depth = 0;
let firstCommaAtDepth1 = -1;
for (let i = 0; i < raw.length; i++) {
const c = raw[i];
if (c === '(') depth += 1;
else if (c === ')') depth -= 1;
else if (c === ',' && depth === 1) {
firstCommaAtDepth1 = i;
break;
}
}
if (firstCommaAtDepth1 === -1) break;
let tail = raw.slice(firstCommaAtDepth1 + 1).trim();
Eif (tail.endsWith(')')) tail = tail.slice(0, -1).trim();
raw = tail;
}
return chain;
}
/** Collect all component hooks referenced in a declaration value. */
export function extractHooksFromValue(value: string | null | undefined): Set<string> {
const hooks = new Set<string>();
const matches = String(value ?? '').match(HOOK_TOKEN_RE);
if (matches) for (const m of matches) hooks.add(m);
return hooks;
}
/**
* Walk a flattened PostCSS root and produce a declaration model keyed by
* normalized selector. Comma-separated selector lists are kept verbatim so
* customer-visible selector shape is preserved in reporting.
*/
export function extractDeclModel(rootNode: Root): Map<string, DeclModel[]> {
const bySelector = new Map<string, DeclModel[]>();
rootNode.walkRules((rule) => {
const rawSelector = normalizeSelector(rule.selector);
let bucket = bySelector.get(rawSelector);
if (!bucket) {
bucket = [];
bySelector.set(rawSelector, bucket);
}
rule.walkDecls((decl) => {
const rawValue = String(decl.value ?? '').trim();
bucket!.push({
prop: decl.prop,
rawValue,
hooksRead: [...extractHooksFromValue(rawValue)],
terminalFallback: terminalFallback(rawValue),
varChain: extractVarChain(rawValue),
line: decl.source?.start?.line ?? null,
source: decl.source?.input?.from ?? null,
});
});
});
return bySelector;
}
/**
* Walk a flattened theme-file root and produce
* `{selector: {hookProp: HookAssignment}}`. Only declarations whose prop
* matches `HOOK_PROP_RE` are captured. Later assignments win within the
* same selector, matching CSS cascade within a single file. Each
* assignment carries the `value` plus its source `path` + `line`.
*/
export function extractHookAssignments(rootNode: Root): ThemeAssignmentsBlock['assignmentsBySelector'] {
const selectors: ThemeAssignmentsBlock['assignmentsBySelector'] = {};
rootNode.walkRules((rule) => {
const hooks: Record<string, ThemeAssignmentsBlock['assignmentsBySelector'][string][string]> = {};
rule.walkDecls((decl) => {
if (!HOOK_PROP_RE.test(decl.prop)) return;
hooks[decl.prop] = {
value: String(decl.value ?? '').trim(),
source: decl.source?.input?.from ?? null,
line: decl.source?.start?.line ?? null,
};
});
if (Object.keys(hooks).length === 0) return;
const selector = normalizeSelector(rule.selector);
const existing = selectors[selector];
selectors[selector] = existing ? { ...existing, ...hooks } : hooks;
});
return selectors;
}
/**
* Collect every at-rule of interest — currently
* `@media (prefers-reduced-motion: reduce)` blocks and `[kx-*]` rules — so
* the diff engine can spot motion/kinetics blocks that vanished.
*/
export function extractMotionSignals(rootNode: Root): MotionSignals {
const signals: MotionSignals = {
reducedMotionBlocks: 0,
kxRules: 0,
};
rootNode.walkAtRules((atRule) => {
if (atRule.name !== 'media') return;
if (/prefers-reduced-motion/i.test(atRule.params)) signals.reducedMotionBlocks += 1;
});
rootNode.walkRules((rule) => {
if (/\[kx-/i.test(rule.selector)) signals.kxRules += 1;
});
return signals;
}
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