giles
96132d9cfe
Document the design for native s-expression style primitives (css :flex :gap-4 ...) to replace Tailwind CSS strings with first-class SX expressions. Covers style dictionary, resolver, delivery/caching (localStorage like components), server-side session tracking, and migration tooling. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
381 lines
20 KiB
Markdown
381 lines
20 KiB
Markdown
# On-Demand CSS System — Replace Tailwind with Server-Driven Style Delivery
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## Context
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The app recently moved from Tailwind CDN to a pre-built tw.css (92KB, Tailwind v4), but v4 broke styles since the classes target v3. Currently reverted to CDN for dev. Rather than fixing the v3/v4 mismatch, we replace Tailwind entirely with an on-demand CSS system: the server knows exactly which classes each response uses (because it renders sx→HTML), so it sends only the CSS rules needed — zero unused CSS, zero build step, zero Tailwind dependency.
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This mirrors the existing `SX-Components` dedup protocol: client tells server what it has, server sends only what's new.
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## Phase 1: Minimal Viable System
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### Step 1: CSS Registry — `shared/sx/css_registry.py` (new file)
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Parse `tw.css` at startup into a dict mapping HTML class names → CSS rule text.
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- **`load_css_registry(path)`** — parse tw.css once at startup, populate module-level `_REGISTRY: dict[str, str]` and `_PREAMBLE: str` (the `@property` / `@layer` declarations that define `--tw-*` vars)
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- **`_css_selector_to_class(selector)`** — unescape CSS selectors (`.sm\:hidden` → `sm:hidden`, `.h-\[60vh\]` → `h-[60vh]`)
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- **`lookup_rules(classes: set[str]) -> str`** — return concatenated CSS for a set of class names, preserving source order from tw.css
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- **`get_preamble() -> str`** — return the preamble (sent once per page load)
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The parser uses brace-depth tracking to split minified CSS into individual rules, extracts selectors, unescapes to get HTML class names. Rules inside `@media` blocks are stored with their wrapping `@media`.
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### Step 2: Class Collection During Render — `shared/sx/html.py`
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Add a `contextvars.ContextVar[set[str] | None]` for collecting classes. In `_render_element()` (line ~460-469), when processing a `class` attribute, split the value and add to the collector if active.
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```python
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# ~3 lines added in _render_element after the attr loop
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if attr_name == "class" and attr_val:
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collector = _css_class_collector.get(None)
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if collector is not None:
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collector.update(str(attr_val).split())
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```
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### Step 3: Sx Source Scanner — `shared/sx/css_registry.py`
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For sx pages where the body is rendered *client-side* (sx source sent as text, not pre-rendered HTML), we can't use the render-time collector. Instead, scan sx source text for `:class "..."` patterns:
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```python
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def scan_classes_from_sx(source: str) -> set[str]:
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"""Extract class names from :class "..." in sx source text."""
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```
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This runs on both component definitions and page sx source at response time.
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### Step 4: Wire Into Responses — `shared/sx/helpers.py`
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**`sx_page()` (full page loads, line 416):**
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1. Scan `component_defs` + `page_sx` for classes via `scan_classes_from_sx()`
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2. Look up rules + preamble from registry
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3. Replace `<script src="https://cdn.tailwindcss.com...">` in `_SX_PAGE_TEMPLATE` with `<style id="sx-css">{preamble}\n{rules}</style>`
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4. Add `<meta name="sx-css-classes" content="{comma-separated classes}">` so client knows what it has
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**`sx_response()` (fragment swaps, line 325):**
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1. Read `SX-Css` header from request (client's known classes)
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2. Scan the sx source for classes
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3. Compute new classes = found - known
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4. If new rules exist, prepend `<style data-sx-css>{rules}</style>` to response body
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5. Set `SX-Css-Add` response header with the new class names (so client can track without parsing CSS)
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### Step 5: Client-Side Tracking — `shared/static/scripts/sx.js`
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**Boot (page load):**
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- Read `<meta name="sx-css-classes">` → populate `_sxCssKnown` dict
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**Request header (in `_doFetch`, line ~1516):**
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- After sending `SX-Components`, also send `SX-Css: flex,p-2,sm:hidden,...`
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**Response handling (line ~1641 for text/sx, ~1698 for HTML):**
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- Strip `<style data-sx-css>` blocks from response, inject into `<style id="sx-css">` in `<head>`
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- Read `SX-Css-Add` response header, merge class names into `_sxCssKnown`
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### Step 6: Jinja Path Fallback — `shared/browser/templates/_types/root/_head.html`
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For non-sx pages still using Jinja templates, serve all CSS rules (full registry dump) in `<style id="sx-css">`. Add a Jinja global `sx_css_all()` in `shared/sx/jinja_bridge.py` that returns preamble + all rules. This is the same 92KB but self-hosted with no Tailwind dependency. These pages can be optimized later.
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### Step 7: Startup — `shared/sx/jinja_bridge.py`
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Call `load_css_registry()` in `setup_sx_bridge()` after loading components.
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## Files to Modify
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| File | Change |
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|------|--------|
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| `shared/sx/css_registry.py` | **NEW** — registry, parser, scanner, lookup |
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| `shared/sx/html.py` | Add contextvar + 3 lines in `_render_element` |
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| `shared/sx/helpers.py` | Modify `_SX_PAGE_TEMPLATE`, `sx_page()`, `sx_response()` |
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| `shared/sx/jinja_bridge.py` | Call `load_css_registry()` at startup, add `sx_css_all()` Jinja global |
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| `shared/static/scripts/sx.js` | `_sxCssKnown` tracking, `SX-Css` header, response CSS injection |
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| `shared/browser/templates/_types/root/_head.html` | Replace Tailwind CDN with `{{ sx_css_all() }}` |
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## Key Design Decisions
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- **Source of truth:** tw.css (already compiled, known to be correct for current classes)
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- **Dedup model:** Mirrors `SX-Components` — client declares what it has, server sends the diff
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- **Header size:** ~599 class names × ~10 chars ≈ 6KB header — within limits, can optimize later with hashing
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- **CSS ordering:** Registry preserves tw.css source order (later rules win for equal specificity)
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- **Preamble:** `--tw-*` custom property defaults (~2KB) always included on first page load
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## Verification
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1. Start blog service: `./dev.sh blog`
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2. Load `https://blog.rose-ash.com/index/` — verify styles match current CDN appearance
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3. View page source — should have `<style id="sx-css">` instead of Tailwind CDN script
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4. Navigate via sx swap (click a post) — check DevTools Network tab for `SX-Css` request header and `SX-Css-Add` response header
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5. Inspect `<style id="sx-css">` — should grow as new pages introduce new classes
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6. Check non-sx pages still render correctly (full CSS dump fallback)
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## Phase 2: S-Expression Styles — Native SX Style Primitives
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### Context
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SX eliminated the HTML/JS divide — code is data is DOM. But one foreign language remains: CSS. Components are full of `:class "flex gap-4 items-center p-2 bg-sky-100 rounded"` — opaque strings from a separate language (Tailwind) that requires a separate build step (Tailwind v3 CLI), a separate parser (css_registry.py parsing tw.css), and a separate delivery mechanism (hash-based dedup).
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**Goal:** Make styles first-class SX expressions. `(css :flex :gap-4 :items-center :p-2 :bg-sky-100 :rounded)` replaces `"flex gap-4 items-center p-2 bg-sky-100 rounded"`. Same mental model as Tailwind — atomic utility keywords — but native to the language. No build step. No external CSS framework. Code = data = DOM = styles.
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### Surface Syntax
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```lisp
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;; Before (Tailwind class strings)
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(div :class "flex gap-4 items-center p-2 bg-sky-100 rounded" ...)
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;; After (SX style expressions)
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(div :style (css :flex :gap-4 :items-center :p-2 :bg-sky-100 :rounded) ...)
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;; Responsive + pseudo-classes (variant:atom, parsed as single keyword)
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(div :style (css :flex :gap-2 :sm:gap-4 :sm:flex-row :hover:bg-sky-200) ...)
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;; Named styles
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(defstyle card-base (css :rounded-xl :bg-white :shadow :hover:shadow-md :transition))
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(div :style card-base ...)
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;; Composition
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(div :style (merge-styles card-base (css :p-4 :border :border-stone-200)) ...)
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;; Conditional
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(div :style (if active (css :bg-sky-500 :text-white) (css :bg-stone-100)) ...)
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;; Both :class and :style coexist during migration
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(div :class "prose" :style (css :p-4 :max-w-3xl) ...)
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```
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**Why `(css :flex :gap-4)` not `(flex :gap 4)` or `(style :display :flex :gap "1rem")`?**
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- Keywords mirror Tailwind class names 1:1 — migration is mechanical search-replace
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- Single `css` primitive, no namespace pollution (hundreds of functions like `flex`, `p`, `bg`)
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- Parser already handles `:hover:bg-sky-200` as one keyword (regex `:[a-zA-Z_][a-zA-Z0-9_>:-]*`)
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### Architecture
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#### Three layers
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1. **Style Dictionary** (`style_dict.py`) — maps keyword atoms to CSS declarations. Pure data. Replaces tw.css.
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2. **Style Resolver** (`style_resolver.py`) — `(css :flex :gap-4)` → `StyleValue(class_name="sx-a3f2c1", declarations="display:flex;gap:1rem")`. Memoized.
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3. **Style Registry** — generated CSS rules registered into the existing `css_registry.py` delivery system. Same hash-based dedup, same `<style data-sx-css>`, same `SX-Css` header.
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#### Output: generated classes (not inline styles)
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Inline `style="..."` can't express `:hover`, `:focus`, `@media` breakpoints, or combinators. Generated classes preserve all Tailwind functionality. The `css` primitive produces a `StyleValue` with a content-addressed class name. The renderer emits `class="sx-a3f2c1"` and registers the CSS rule for on-demand delivery.
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### Style Delivery & Caching
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#### Current system (CSS classes)
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1. **Full page load**: Server scans rendered SX for class names → `lookup_rules()` gets CSS for those classes → embeds in `<style id="sx-css">` + stores hash in `<meta name="sx-css-classes">`
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2. **Subsequent SX requests**: Client sends `SX-Css: {8-char-hash}` header → server resolves hash to known class set → computes delta (new classes only) → sends `<style data-sx-css>{new rules}</style>` inline in response + `SX-Css-Hash` response header with updated cumulative hash
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3. **Client accumulates**: `sx.js` extracts `<style data-sx-css>` blocks, appends rules to `<style id="sx-css">`, updates its `_sxCssHash`
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#### Current system (components)
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- Components cached in **localStorage** by content hash
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- Server checks `sx-comp-hash` cookie → if client has current hash, omits component source from response body
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- Client loads from localStorage on cache hit, downloads on miss
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#### New system (SX styles) — same pattern as components
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**Key insight**: The style dictionary (`STYLE_ATOMS`) is a fixed dataset, like component definitions. It changes only on deployment, not per-request. Cache it in localStorage like components, not per-request like CSS class deltas.
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**Server side:**
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- At startup, hash the full style dictionary → `sx-style-dict-hash`
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- Check `sx-style-hash` cookie on each request
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- If client has current hash: omit dictionary from response
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- If client is stale/missing: include `<script type="text/sx-styles" data-hash="{hash}">{serialized dict}</script>` in full-page response
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- Generated CSS rules (from `(css ...)` evaluation) are tracked the same way current CSS classes are — server sends only new rules client doesn't have
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**Client side (`sx.js`):**
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- On full page load: check `<script type="text/sx-styles" data-hash="{hash}">`
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- If hash matches localStorage `sx-styles-hash`: load from localStorage (skip download)
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- If hash differs or no cache: parse inline dict, store in localStorage, set cookie
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- Style dictionary lives in memory as a JS object for `css` primitive lookups
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- Generated CSS rules injected into `<style id="sx-css">` (same as current system)
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**Per-request style delivery** (for SX responses after initial page):
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- `(css ...)` produces `StyleValue` on server → renderer emits `class="sx-a3f2c1"`
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- Server registers generated rule in `_REGISTRY` → `lookup_rules()` picks it up
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- Existing `SX-Css` hash mechanism sends only new CSS rules to client
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- No change needed to the delta delivery pipeline — generated class names flow through `lookup_rules()` exactly like Tailwind class names do today
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**Server-side session tracking** (optimization):
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- Server maintains `dict[client_id, set[str]]` mapping client IDs to known style rule hashes
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- Client ID = session cookie or device ID (already exists in rose-ash auth system)
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- On each response, server records which style rules were sent to this client
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- On subsequent requests, server checks its record before computing delta
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- Falls back to hash-based negotiation if server-side record is missing (restart, eviction)
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- This avoids the round-trip cost of the client needing to tell the server what it knows — the server already knows
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**Data transfer optimization:**
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- Style dictionary: ~15-20KB serialized, sent once, cached in localStorage indefinitely (until hash changes on deploy)
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- Per-request: only delta CSS rules (typically 0-500 bytes for navigation to a new page type)
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- Preamble (resets, FontAwesome, basics.css): sent once on full page load, same as today
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- Total initial download actually decreases: style dict (~20KB) < tw.css sent as rules (~40KB+ for pages using many classes)
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### Implementation Phases
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#### Phase 2.0: Style Dictionary
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**New file: `shared/sx/style_dict.py`**
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Pure data mapping ~500 keyword atoms (the ones actually used across the codebase) to CSS declarations:
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```python
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STYLE_ATOMS: dict[str, str] = {
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"flex": "display:flex",
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"hidden": "display:none",
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"block": "display:block",
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"flex-col": "flex-direction:column",
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"flex-row": "flex-direction:row",
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"items-center": "align-items:center",
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"justify-between": "justify-content:space-between",
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"gap-1": "gap:0.25rem",
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"gap-2": "gap:0.5rem",
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"gap-4": "gap:1rem",
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"p-2": "padding:0.5rem",
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"px-4": "padding-left:1rem;padding-right:1rem",
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"bg-sky-100": "background-color:rgb(224 242 254)",
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"rounded": "border-radius:0.25rem",
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"rounded-xl": "border-radius:0.75rem",
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"text-sm": "font-size:0.875rem;line-height:1.25rem",
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"font-semibold": "font-weight:600",
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"shadow": "box-shadow:0 1px 3px 0 rgb(0 0 0/0.1),0 1px 2px -1px rgb(0 0 0/0.1)",
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"transition": "transition-property:color,background-color,border-color,text-decoration-color,fill,stroke,opacity,box-shadow,transform,filter,backdrop-filter;transition-timing-function:cubic-bezier(0.4,0,0.2,1);transition-duration:150ms",
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# ... ~500 entries total
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}
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PSEUDO_VARIANTS: dict[str, str] = {
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"hover": ":hover", "focus": ":focus", "active": ":active",
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"disabled": ":disabled", "first": ":first-child", "last": ":last-child",
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"group-hover": ":is(.group:hover) &",
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}
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RESPONSIVE_BREAKPOINTS: dict[str, str] = {
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"sm": "(min-width:640px)", "md": "(min-width:768px)",
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"lg": "(min-width:1024px)", "xl": "(min-width:1280px)",
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}
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```
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Generated by: scanning all `:class "..."` across 64 .sx files to find used atoms, then extracting their CSS from the existing tw.css via `css_registry.py`'s parsed `_REGISTRY`.
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#### Phase 2.1: StyleValue type + `css` primitive + resolver
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**Modify: `shared/sx/types.py`** — add StyleValue:
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```python
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@dataclass(frozen=True)
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class StyleValue:
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class_name: str # "sx-a3f2c1"
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declarations: str # "display:flex;gap:1rem"
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media_rules: tuple = () # ((query, decls), ...)
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pseudo_rules: tuple = () # ((selector, decls), ...)
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```
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**New file: `shared/sx/style_resolver.py`** — memoized resolver:
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- Takes tuple of atom strings (e.g., `("flex", "gap-4", "hover:bg-sky-200", "sm:flex-row")`)
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- Splits variant prefixes (`hover:bg-sky-200` → variant=`hover`, atom=`bg-sky-200`)
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- Looks up declarations in STYLE_ATOMS
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- Groups into base / pseudo / media
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- Hashes declarations → deterministic class name `sx-{hash[:6]}`
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- Returns `StyleValue`
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- Dict cache keyed on input tuple
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**Modify: `shared/sx/primitives.py`** — add `css` and `merge-styles`:
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```python
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@register_primitive("css")
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def prim_css(*args):
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from .style_resolver import resolve_style
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return resolve_style(tuple(str(a) for a in args if a))
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@register_primitive("merge-styles")
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def prim_merge_styles(*styles):
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from .style_resolver import merge_styles
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return merge_styles([s for s in styles if isinstance(s, StyleValue)])
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```
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#### Phase 2.2: Server-side rendering + delivery integration
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**Modify: `shared/sx/html.py`** — in `_render_element()` (line ~482):
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- When `:style` evaluates to a `StyleValue`: emit its `class_name` as a CSS class (appended to any existing `:class`), register the rule with `register_generated_rule()`, don't emit `:style` attribute
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- When `:style` is a string: existing behavior (inline style attribute)
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**Modify: `shared/sx/async_eval.py`** — same change in `_arender_element()` (line ~641)
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**Modify: `shared/sx/css_registry.py`** — add `register_generated_rule(style_val)`:
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- Builds CSS rule: `.sx-a3f2c1{display:flex;gap:1rem}`
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- Plus pseudo rules: `.sx-a3f2c1:hover{background-color:...}`
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- Plus media rules: `@media(min-width:640px){.sx-a3f2c1{flex-direction:row}}`
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- Inserts into `_REGISTRY` so existing `lookup_rules()` works transparently
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- Generated rules flow through the same `SX-Css` hash delta mechanism — no new delivery protocol needed
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**Modify: `shared/sx/helpers.py`** — style dictionary delivery:
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- In `sx_page_shell()` (full page): include style dictionary as `<script type="text/sx-styles" data-hash="{hash}">` with localStorage caching (same pattern as component caching)
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- Check `sx-style-hash` cookie: if client has current hash, omit dictionary source
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- In `sx_response()` (SX fragment responses): no change — generated CSS rules already flow through `<style data-sx-css>`
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**Modify: `shared/infrastructure/factory.py`** — add `sx-style-hash` to allowed headers in CORS config
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#### Phase 2.3: Client-side (sx.js)
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**Modify: `shared/static/scripts/sx.js`**:
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- Add `StyleValue` type (`{_style: true, className, declarations, pseudoRules, mediaRules}`)
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- Add `css` primitive to PRIMITIVES
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- Add resolver logic (split variants, lookup from in-memory dict, hash, memoize)
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- In `renderElement()`: when `:style` value is StyleValue, add className to element and inject CSS rule into `<style id="sx-css">` (same target as server-sent rules)
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- Add `merge-styles` primitive
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- Add `defstyle` to SPECIAL_FORMS
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- Add style dictionary localStorage caching (same pattern as components):
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- On init: check `<script type="text/sx-styles" data-hash="{hash}">`
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- Cache hit (hash matches localStorage): load dict from localStorage, skip inline parse
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- Cache miss: parse inline dict, store in localStorage, set `sx-style-hash` cookie
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- Dict lives in `_styleAtoms` var for `css` primitive to look up at render time
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**No separate `sx-styles.js`** — the style dictionary is delivered inline in the full-page shell (like components) and cached in localStorage. No extra HTTP request.
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#### Phase 2.4: `defstyle` special form
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**Modify: `shared/sx/evaluator.py`** — add `defstyle`:
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```lisp
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(defstyle card-base (css :rounded-xl :bg-white :shadow))
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```
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Evaluates the body → StyleValue, binds to name in env. Essentially `define` but semantically distinct for tooling.
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**Mirror in `shared/sx/async_eval.py`** and `sx.js`.
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#### Phase 2.5: Migration tooling + gradual conversion
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**New: `shared/sx/tools/class_to_css.py`** — converter script:
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- `:class "flex gap-4 p-2"` → `:style (css :flex :gap-4 :p-2)`
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- `(str "base " conditional)` → leave as `:class` or split into static `:style` + dynamic `:class`
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- `(if cond "classes-a" "classes-b")` → `(if cond (css :classes-a) (css :classes-b))`
|
||
|
||
**Dynamic class construction** (2-3 occurrences in `layout.sx`):
|
||
- `(str "bg-" c "-" shade)` — keep as `:class` or add `(css-dynamic ...)` runtime lookup
|
||
|
||
#### Phase 2.6: Remove Tailwind
|
||
|
||
- Delete `tailwind.config.js`, remove tw.css build step
|
||
- Remove tw.css parsing from `load_css_registry()`
|
||
- Keep extra CSS (basics.css, cards.css, blog-content.css, FontAwesome)
|
||
- `css_registry.py` becomes pure runtime registry for generated + extra CSS
|
||
|
||
### Phase 2 Files
|
||
|
||
| File | Change |
|
||
|------|--------|
|
||
| `shared/sx/style_dict.py` | **New** — keyword → CSS declaration mapping (~500 atoms) |
|
||
| `shared/sx/style_resolver.py` | **New** — resolve (css ...) → StyleValue, memoized |
|
||
| `shared/sx/types.py` | Add `StyleValue` dataclass |
|
||
| `shared/sx/primitives.py` | Add `css`, `merge-styles` primitives |
|
||
| `shared/sx/html.py` | Handle StyleValue in `:style` attribute rendering |
|
||
| `shared/sx/async_eval.py` | Same StyleValue handling in async render path |
|
||
| `shared/sx/css_registry.py` | Add `register_generated_rule()` |
|
||
| `shared/sx/helpers.py` | Style dict delivery in page shell, cookie check, localStorage caching protocol |
|
||
| `shared/sx/evaluator.py` | Add `defstyle` special form |
|
||
| `shared/infrastructure/factory.py` | Add `sx-style-hash` cookie/header to CORS |
|
||
| `shared/static/scripts/sx.js` | StyleValue, css/merge-styles, defstyle, dict caching, style injection |
|
||
| `shared/sx/tools/class_to_css.py` | **New** — migration converter |
|
||
|
||
### Phase 2 Verification
|
||
|
||
- **Phase 2.1**: Unit test — `(css :flex :gap-4 :p-2)` returns correct StyleValue
|
||
- **Phase 2.2**: Render test — `(div :style (css :flex :gap-4))` → `<div class="sx-a3f2c1">` + CSS rule registered
|
||
- **Phase 2.3**: Browser test — client renders `:style (css ...)` with injected `<style>` rules
|
||
- **Phase 2.5**: Convert one .sx file, diff HTML output to verify identical rendering
|
||
- **Throughout**: existing `:class "..."` continues to work unchanged
|