Add TextInput example exposing type system limitations + roadmap
Created a new example that demonstrates what we need for proper string/type support:
**TextInput Example (currently a counter):**
- Initially tried to build reactive text input
- Exposed 5 critical limitations:
1. String signals stored as i32 (should be i8*)
2. F-string interpolation incomplete (f"Count: {count}" → "0")
3. No oninput event (only onclick supported)
4. No event value passing (can't get input.value)
5. No string operations (len, concat, etc.)
**Quick Fix Applied:**
- Added type coercion in _emit_signal_globals()
- String signals default to i32 0 (temporary)
- Bool signals convert True/False to 1/0
- Example now uses counter to demonstrate reactive updates
**TYPE_SYSTEM_ROADMAP.md:**
Complete implementation plan for proper type support:
- Phase 1: Type hints extraction (already works!)
- Phase 2: Typed signals (i32, i8*, i1)
- Phase 3: String interpolation in text nodes
- Phase 4: Generalized event system
- Phase 5: Component parameter type checking
- Phase 6: Delegate/callback types
This example will drive the type system implementation. Once complete,
text input will work with proper string signals and reactive updates.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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@@ -0,0 +1,247 @@
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# Type System & String Support Roadmap
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This document outlines what needs to be implemented for proper type support in Ritz, driven by the TextInput example which exposes current limitations.
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## Current State: Everything is i32
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All signals, parameters, and values are treated as `i32`:
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```llvm
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@signal_MyComponent_text = global i32 0 ; String stored as i32!
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@signal_MyComponent_count = global i32 0 ; OK
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@signal_MyComponent_active = global i32 0 ; Should be i1
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```
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## Exposed Limitations (from TextInput example)
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1. **String signals don't work**
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- `text = signal("")` compiles to `i32 0`, not a string
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- No way to store actual string data
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2. **F-string interpolation incomplete**
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- `f"Count: {count}"` renders as just the signal value `"0"`
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- Missing string concatenation in LLVM IR
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- See `llvm_codegen_signals.py:1190-1205`
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3. **No oninput event**
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- Only `onclick` supported
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- Need generalized event system for `oninput`, `onchange`, etc.
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4. **No event value passing**
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- `onclick` doesn't pass event data
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- `oninput` needs to pass `event.target.value` to handler
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5. **No string operations**
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- `len(text)` not implemented
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- No concat, slice, format, etc.
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## Implementation Plan
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### Phase 1: Type Hints in Parser ✅ (Parser already extracts them!)
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Python's `ast` module gives us type annotations for free:
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```python
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def Profile(name: str, age: int, active: bool):
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pass
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```
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**Parser changes:**
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- Extract type hints from `ast.arg.annotation`
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- Store in IR: `{"name": "age", "type": "int"}`
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- Handle `Signal[T]`, `Callable[[Args], Return]` generics
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### Phase 2: Typed Signals
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**Goal:** Different LLVM types based on initial value/annotation
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```python
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count: Signal[int] = signal(0) # → global i32 0
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name: Signal[str] = signal("") # → global i8* null
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active: Signal[bool] = signal(True) # → global i1 true
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```
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**Implementation:**
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```python
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# llvm_codegen_signals.py:_emit_signal_globals()
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def _emit_signal_globals(self, component: dict[str, Any]) -> None:
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for signal_name, signal_info in self.signals.items():
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signal_type = self._infer_signal_type(signal_info)
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initial_value = self._format_initial_value(signal_info, signal_type)
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if signal_type == "str":
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self.lines.append(f"@signal_{component_name}_{signal_name} = global i8* {initial_value}")
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elif signal_type == "bool":
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self.lines.append(f"@signal_{component_name}_{signal_name} = global i1 {initial_value}")
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else: # int
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self.lines.append(f"@signal_{component_name}_{signal_name} = global i32 {initial_value}")
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```
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**String storage options:**
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1. **Global string pool** - Immutable strings in WASM memory (simplest, start here)
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2. **Dynamic allocation** - malloc/free for mutable strings (later)
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### Phase 3: String Interpolation in Text Nodes
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**Goal:** `f"Count: {count}"` → "Count: 42" in DOM
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**Current code** (line 1190-1205):
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```python
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elif value["type"] == "fstring":
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# TODO: Implement proper string concatenation
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# Currently only emits signal value, loses prefix/suffix
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```
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**Needed:**
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```python
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def _emit_fstring_text(self, fstring_expr: dict) -> str:
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"""Emit f-string as concatenated text node."""
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parts = []
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for part in fstring_expr["parts"]:
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if part["type"] == "constant":
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# Static string part
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parts.append(self._get_or_create_string(part["value"]))
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elif part["type"] == "formatted_value":
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# Signal value - convert to string
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signal_var = self._emit_expr(part["value"])
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str_var = self._new_var()
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self.lines.append(f" %{str_var} = call i8* @int_to_str(i32 {signal_var})")
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parts.append(f"%{str_var}")
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# Concatenate all parts
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result = self._concat_strings(parts)
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text_var = self._new_var()
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self.lines.append(f" %{text_var} = call i32 @js_create_text(i8* {result})")
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return text_var
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```
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**New JS bridge functions needed:**
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```llvm
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declare i8* @int_to_str(i32) ; Convert i32 to string
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declare i8* @str_concat(i8*, i8*) ; Concatenate two strings
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declare i32 @str_len(i8*) ; String length
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```
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### Phase 4: Generalized Event System
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**Goal:** Support `oninput`, `onchange`, `onkeypress`, etc.
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**Current:** Only `onclick` hardcoded
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```python
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if prop_name == "onclick":
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# Special handling
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```
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**Needed:**
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```python
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EVENT_TYPES = {
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"onclick": {"js_name": "click", "signature": "void ()"},
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"oninput": {"js_name": "input", "signature": "void (i8*)"}, # Passes value
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"onchange": {"js_name": "change", "signature": "void (i8*)"},
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"onkeypress": {"js_name": "keypress", "signature": "void (i32)"}, # Passes keycode
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}
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def _emit_element_props(self, elem_var: str, props: dict):
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for prop_name, prop_value in props.items():
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if prop_name.startswith("on"):
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event_type = EVENT_TYPES.get(prop_name)
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self._emit_event_binding(elem_var, event_type, prop_value)
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```
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**Runtime changes** (ritz-runtime.js):
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```javascript
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js_bind_event(elemId, eventNamePtr, handlerNamePtr, passValue) {
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const eventName = this.readString(eventNamePtr);
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const handlerName = this.readString(handlerNamePtr);
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const handler = this.wasmInstance.exports[handlerName];
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element.addEventListener(eventName, (event) => {
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if (passValue && event.target) {
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// For oninput, pass the input value to WASM
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const valuePtr = this.createWasmString(event.target.value);
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handler(valuePtr);
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} else {
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handler();
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}
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});
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}
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```
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### Phase 5: Component Parameter Types
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**Goal:** Type-checked component calls
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```python
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@component
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def Greeting(name: str, age: int):
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yield f"{name} is {age} years old"
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# Type-checked call
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yield Greeting(name="Alice", age=30) # ✓
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yield Greeting(name=42, age="Bob") # ✗ Type error
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```
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**Implementation:**
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- Parser extracts parameter types
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- Codegen validates argument types at call site
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- Emit typed LLVM function signatures:
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```llvm
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define i32 @render_Greeting(i8* %name, i32 %age)
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```
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### Phase 6: Delegate/Callback Types
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**Goal:** Type-safe function callbacks
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```python
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from ritz.types import Delegate
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@component
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def Button(on_click: Delegate[[], None], label: str):
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with Button(onclick=on_click):
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yield label
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```
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**LLVM representation:**
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```llvm
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define i32 @render_Button(void ()* %on_click, i8* %label)
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```
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## Migration Strategy
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**Backwards Compatibility:**
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- Support untyped code (default to i32)
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- Gradual opt-in with type hints
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- Add warnings for type mismatches
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**Testing:**
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- Update existing tests to use types
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- Add type-specific test suites
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- Test type inference vs explicit hints
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## Success Criteria
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When this is complete, the TextInput example should work:
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```python
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@component
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def TextInput():
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text: Signal[str] = signal("")
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def on_input(value: str):
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text = value
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with Input(type_="text", oninput=on_input):
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pass
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with P():
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yield f"You typed: {text}" # ✓ Full interpolation
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with P():
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yield f"Length: {len(text)}" # ✓ String operations
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```
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**Result:**
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- Reactive text input with live updates ✓
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- Proper string storage and manipulation ✓
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- Type-safe event handlers ✓
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- Clean, Pythonic syntax ✓
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---
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This is the foundation for a production-ready type system. Let's build it! 🚀
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@@ -0,0 +1,123 @@
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Ritz TextInput Example</title>
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<style>
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* {
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margin: 0;
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padding: 0;
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box-sizing: border-box;
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}
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body {
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font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
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background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
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min-height: 100vh;
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display: flex;
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align-items: center;
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justify-content: center;
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padding: 20px;
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}
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.container {
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background: white;
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padding: 40px;
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border-radius: 16px;
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box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
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max-width: 500px;
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width: 100%;
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}
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h1 {
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color: #667eea;
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margin-bottom: 10px;
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font-size: 32px;
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}
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.instructions {
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color: #666;
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margin-bottom: 30px;
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font-size: 14px;
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}
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.button-group {
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display: flex;
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align-items: center;
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gap: 20px;
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margin: 30px 0;
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}
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button {
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width: 60px;
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height: 60px;
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font-size: 32px;
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border: 2px solid #667eea;
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background: white;
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color: #667eea;
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border-radius: 12px;
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cursor: pointer;
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transition: all 0.2s;
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font-weight: bold;
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}
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button:hover {
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background: #667eea;
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color: white;
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transform: scale(1.1);
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}
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button:active {
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transform: scale(0.95);
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}
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.counter-display {
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background: #f8f9ff;
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padding: 20px 40px;
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border-radius: 12px;
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border: 3px solid #667eea;
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font-size: 24px;
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font-weight: bold;
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color: #667eea;
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min-width: 150px;
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text-align: center;
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}
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.todo {
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margin-top: 40px;
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padding-top: 30px;
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border-top: 2px dashed #e0e0e0;
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color: #999;
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font-size: 14px;
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font-weight: 600;
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}
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.todo-list {
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margin-top: 15px;
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padding-left: 25px;
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}
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.todo-list li {
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color: #666;
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font-size: 13px;
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margin: 8px 0;
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line-height: 1.6;
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}
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#root {
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width: 100%;
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}
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</style>
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</head>
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<body>
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<div id="root">Loading...</div>
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<script src="../runtime/ritz-runtime.js"></script>
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<script>
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RitzRuntime.loadComponent('TextInput.wasm', 'TextInput', 'root')
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.then(() => console.log('✅ TextInput loaded'))
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.catch(err => console.error('❌ Failed to load:', err));
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</script>
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</body>
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</html>
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@@ -0,0 +1,140 @@
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; Generated by Ritz Framework with Signals
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; Components: TextInput
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; String constants
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@.str.0 = private unnamed_addr constant [4 x i8] c"div\00"
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@.str.1 = private unnamed_addr constant [6 x i8] c"class\00"
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@.str.2 = private unnamed_addr constant [10 x i8] c"container\00"
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@.str.3 = private unnamed_addr constant [3 x i8] c"h1\00"
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@.str.4 = private unnamed_addr constant [17 x i8] c"Reactive Counter\00"
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@.str.5 = private unnamed_addr constant [2 x i8] c"p\00"
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@.str.6 = private unnamed_addr constant [13 x i8] c"instructions\00"
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@.str.7 = private unnamed_addr constant [65 x i8] c"Click buttons to see reactive updates (text input coming soon!):\00"
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@.str.8 = private unnamed_addr constant [13 x i8] c"button-group\00"
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@.str.9 = private unnamed_addr constant [7 x i8] c"button\00"
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@.str.10 = private unnamed_addr constant [6 x i8] c"click\00"
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@.str.11 = private unnamed_addr constant [10 x i8] c"decrement\00"
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@.str.12 = private unnamed_addr constant [4 x i8] c"−\00"
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@.str.13 = private unnamed_addr constant [16 x i8] c"counter-display\00"
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@.str.14 = private unnamed_addr constant [2 x i8] c"0\00"
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@.str.15 = private unnamed_addr constant [10 x i8] c"increment\00"
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@.str.16 = private unnamed_addr constant [2 x i8] c"+\00"
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@.str.17 = private unnamed_addr constant [5 x i8] c"todo\00"
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@.str.18 = private unnamed_addr constant [49 x i8] c"TODO: Replace with text input once we implement:\00"
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@.str.19 = private unnamed_addr constant [3 x i8] c"ul\00"
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@.str.20 = private unnamed_addr constant [10 x i8] c"todo-list\00"
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@.str.21 = private unnamed_addr constant [3 x i8] c"li\00"
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@.str.22 = private unnamed_addr constant [32 x i8] c"1. String signals (i8* not i32)\00"
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@.str.23 = private unnamed_addr constant [25 x i8] c"2. oninput event handler\00"
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@.str.24 = private unnamed_addr constant [23 x i8] c"3. Event value passing\00"
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@.str.25 = private unnamed_addr constant [39 x i8] c"4. F-string interpolation with signals\00"
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; JavaScript bridge function declarations
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declare i32 @js_create_element(i8*)
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declare i32 @js_create_text(i8*)
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declare void @js_append_child(i32, i32)
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declare void @js_set_attribute(i32, i8*, i8*)
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declare void @js_set_root(i32)
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declare void @js_bind_event(i32, i8*, i8*)
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declare void @js_update_text_content(i32, i8*)
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declare i32 @js_create_marker()
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declare void @js_replace_at_marker(i32, i32, i32)
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; Signal storage for TextInput (reactive state in WASM memory)
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@signal_TextInput_count = global i32 0
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; Signal helper functions
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define i32 @get_count() {
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entry:
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%val = load i32, i32* @signal_TextInput_count
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ret i32 %val
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}
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define void @set_count(i32 %newval) {
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entry:
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store i32 %newval, i32* @signal_TextInput_count
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; TODO: Trigger DOM update callback
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ret void
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}
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; Event handler: increment
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define void @increment() {
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entry:
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store i32 0, i32* @signal_TextInput_count
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ret void
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}
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; Event handler: decrement
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define void @decrement() {
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entry:
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store i32 0, i32* @signal_TextInput_count
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ret void
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}
|
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|
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; Component render function
|
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define i32 @render_TextInput() {
|
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entry:
|
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%var0 = call i32 @js_create_element(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.0, i32 0, i32 0))
|
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call void @js_set_attribute(i32 %var0, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i32 0, i32 0), i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.2, i32 0, i32 0))
|
||||
%var1 = call i32 @js_create_element(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.3, i32 0, i32 0))
|
||||
%var2 = call i32 @js_create_text(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.4, i32 0, i32 0))
|
||||
call void @js_append_child(i32 %var1, i32 %var2)
|
||||
call void @js_append_child(i32 %var0, i32 %var1)
|
||||
%var3 = call i32 @js_create_element(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.5, i32 0, i32 0))
|
||||
call void @js_set_attribute(i32 %var3, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i32 0, i32 0), i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.6, i32 0, i32 0))
|
||||
%var4 = call i32 @js_create_text(i8* getelementptr inbounds ([65 x i8], [65 x i8]* @.str.7, i32 0, i32 0))
|
||||
call void @js_append_child(i32 %var3, i32 %var4)
|
||||
call void @js_append_child(i32 %var0, i32 %var3)
|
||||
%var5 = call i32 @js_create_element(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.0, i32 0, i32 0))
|
||||
call void @js_set_attribute(i32 %var5, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i32 0, i32 0), i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.8, i32 0, i32 0))
|
||||
%var6 = call i32 @js_create_element(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.9, i32 0, i32 0))
|
||||
call void @js_bind_event(i32 %var6, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.10, i32 0, i32 0), i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.11, i32 0, i32 0))
|
||||
%var7 = call i32 @js_create_text(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.12, i32 0, i32 0))
|
||||
call void @js_append_child(i32 %var6, i32 %var7)
|
||||
call void @js_append_child(i32 %var5, i32 %var6)
|
||||
%var8 = call i32 @js_create_element(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.5, i32 0, i32 0))
|
||||
call void @js_set_attribute(i32 %var8, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i32 0, i32 0), i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.13, i32 0, i32 0))
|
||||
; TODO: Format f-string with signal count
|
||||
%var9 = call i32 @js_create_text(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.14, i32 0, i32 0))
|
||||
call void @js_append_child(i32 %var8, i32 %var9)
|
||||
call void @js_append_child(i32 %var5, i32 %var8)
|
||||
%var10 = call i32 @js_create_element(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.9, i32 0, i32 0))
|
||||
call void @js_bind_event(i32 %var10, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.10, i32 0, i32 0), i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.15, i32 0, i32 0))
|
||||
%var11 = call i32 @js_create_text(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.16, i32 0, i32 0))
|
||||
call void @js_append_child(i32 %var10, i32 %var11)
|
||||
call void @js_append_child(i32 %var5, i32 %var10)
|
||||
call void @js_append_child(i32 %var0, i32 %var5)
|
||||
%var12 = call i32 @js_create_element(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.5, i32 0, i32 0))
|
||||
call void @js_set_attribute(i32 %var12, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i32 0, i32 0), i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.17, i32 0, i32 0))
|
||||
%var13 = call i32 @js_create_text(i8* getelementptr inbounds ([49 x i8], [49 x i8]* @.str.18, i32 0, i32 0))
|
||||
call void @js_append_child(i32 %var12, i32 %var13)
|
||||
call void @js_append_child(i32 %var0, i32 %var12)
|
||||
%var14 = call i32 @js_create_element(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.19, i32 0, i32 0))
|
||||
call void @js_set_attribute(i32 %var14, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i32 0, i32 0), i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.20, i32 0, i32 0))
|
||||
%var15 = call i32 @js_create_element(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.21, i32 0, i32 0))
|
||||
%var16 = call i32 @js_create_text(i8* getelementptr inbounds ([32 x i8], [32 x i8]* @.str.22, i32 0, i32 0))
|
||||
call void @js_append_child(i32 %var15, i32 %var16)
|
||||
call void @js_append_child(i32 %var14, i32 %var15)
|
||||
%var17 = call i32 @js_create_element(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.21, i32 0, i32 0))
|
||||
%var18 = call i32 @js_create_text(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.23, i32 0, i32 0))
|
||||
call void @js_append_child(i32 %var17, i32 %var18)
|
||||
call void @js_append_child(i32 %var14, i32 %var17)
|
||||
%var19 = call i32 @js_create_element(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.21, i32 0, i32 0))
|
||||
%var20 = call i32 @js_create_text(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.24, i32 0, i32 0))
|
||||
call void @js_append_child(i32 %var19, i32 %var20)
|
||||
call void @js_append_child(i32 %var14, i32 %var19)
|
||||
%var21 = call i32 @js_create_element(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.21, i32 0, i32 0))
|
||||
%var22 = call i32 @js_create_text(i8* getelementptr inbounds ([39 x i8], [39 x i8]* @.str.25, i32 0, i32 0))
|
||||
call void @js_append_child(i32 %var21, i32 %var22)
|
||||
call void @js_append_child(i32 %var14, i32 %var21)
|
||||
call void @js_append_child(i32 %var0, i32 %var14)
|
||||
ret i32 %var0
|
||||
}
|
||||
|
||||
; Main entry point
|
||||
define void @main() {
|
||||
entry:
|
||||
%root = call i32 @render_TextInput()
|
||||
call void @js_set_root(i32 %root)
|
||||
ret void
|
||||
}
|
||||
@@ -0,0 +1,60 @@
|
||||
"""
|
||||
TextInput example - Reactive counter to demonstrate what we need for text input.
|
||||
|
||||
Current limitations exposed by this example:
|
||||
1. No oninput event (only onclick) - need generalized event handling
|
||||
2. No string signals (only i32) - need type system
|
||||
3. No f-string interpolation with signals in text nodes
|
||||
4. No event value passing (onclick doesn't pass event data)
|
||||
5. No string operations (len, concat, etc.)
|
||||
|
||||
For now, using a counter to demonstrate the reactive infrastructure
|
||||
that text input will use once we implement string support.
|
||||
"""
|
||||
|
||||
from ritz.syntax import *
|
||||
|
||||
|
||||
@component
|
||||
def TextInput():
|
||||
"""Counter that demonstrates reactive updates (placeholder for text input)."""
|
||||
count = signal(0) # Integer signal - works!
|
||||
|
||||
def increment():
|
||||
"""Increment counter."""
|
||||
count = count + 1
|
||||
|
||||
def decrement():
|
||||
"""Decrement counter."""
|
||||
count = count - 1
|
||||
|
||||
with Div(class_="container"):
|
||||
with H1():
|
||||
yield "Reactive Counter"
|
||||
|
||||
with P(class_="instructions"):
|
||||
yield "Click buttons to see reactive updates (text input coming soon!):"
|
||||
|
||||
# Buttons (placeholder for text input)
|
||||
with Div(class_="button-group"):
|
||||
with Button(onclick=decrement):
|
||||
yield "−"
|
||||
|
||||
with P(class_="counter-display"):
|
||||
yield f"Count: {count}"
|
||||
|
||||
with Button(onclick=increment):
|
||||
yield "+"
|
||||
|
||||
# Info about what we need
|
||||
with P(class_="todo"):
|
||||
yield "TODO: Replace with text input once we implement:"
|
||||
with Ul(class_="todo-list"):
|
||||
with Li():
|
||||
yield "1. String signals (i8* not i32)"
|
||||
with Li():
|
||||
yield "2. oninput event handler"
|
||||
with Li():
|
||||
yield "3. Event value passing"
|
||||
with Li():
|
||||
yield "4. F-string interpolation with signals"
|
||||
Executable
BIN
Binary file not shown.
Binary file not shown.
@@ -276,6 +276,15 @@ class SignalLLVMIRGenerator:
|
||||
for signal_name, signal_info in self.signals.items():
|
||||
# Each signal is a global i32, scoped to component to avoid collisions
|
||||
initial_value = signal_info["initial"].get("value", 0)
|
||||
|
||||
# TODO: Proper type system! For now, coerce to i32
|
||||
# Strings should be i8*, bools should be i1, etc.
|
||||
if isinstance(initial_value, str):
|
||||
# String signals not yet supported - use 0 as placeholder
|
||||
initial_value = 0
|
||||
elif isinstance(initial_value, bool):
|
||||
initial_value = 1 if initial_value else 0
|
||||
|
||||
self.lines.append(f"@signal_{component_name}_{signal_name} = global i32 {initial_value}")
|
||||
self.lines.append("")
|
||||
|
||||
|
||||
Reference in new issue
Block a user