feat: implement English Style Converter

- SvelteKit project scaffolded with TypeScript
- Type definitions for Style, StyleCategory, ConversionRequest, ConversionResponse, LLMConfig
- Style definitions with 6 categories and 25 sub-styles
- Intensity mapping (1-5) with prompt modifier placeholders
- LLM client using OpenAI-compatible API (Ollama default)
- POST /api/convert endpoint with input validation
- Animated loading modal with per-letter animations
- Main page UI with category/style selectors, intensity slider
- Copy to clipboard, collapsible prompt display
- Vitest tests for styles, LLM prompt building, and API validation
- Environment configuration for LLM settings
This commit is contained in:
2026-04-12 21:53:27 -04:00
parent fcf80638e1
commit a12afb792e
16 changed files with 1464 additions and 37 deletions

6
.env.example Normal file
View File

@@ -0,0 +1,6 @@
# LLM Configuration (OpenAI-compatible API)
# Default: Ollama running locally
OPENAI_BASE_URL=http://localhost:11434/v1
OPENAI_API_KEY=ollama
OPENAI_MODEL=llama3

375
package-lock.json generated
View File

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"node_modules/zimmerframe": { "node_modules/zimmerframe": {
"version": "1.1.4", "version": "1.1.4",
"resolved": "https://registry.npmjs.org/zimmerframe/-/zimmerframe-1.1.4.tgz", "resolved": "https://registry.npmjs.org/zimmerframe/-/zimmerframe-1.1.4.tgz",

View File

@@ -9,7 +9,9 @@
"preview": "vite preview", "preview": "vite preview",
"prepare": "svelte-kit sync || echo ''", "prepare": "svelte-kit sync || echo ''",
"check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json", "check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
"check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch" "check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch",
"test:unit": "vitest",
"test": "npm run test:unit -- --run"
}, },
"devDependencies": { "devDependencies": {
"@sveltejs/adapter-auto": "^7.0.1", "@sveltejs/adapter-auto": "^7.0.1",
@@ -18,6 +20,7 @@
"svelte": "^5.55.2", "svelte": "^5.55.2",
"svelte-check": "^4.4.6", "svelte-check": "^4.4.6",
"typescript": "^6.0.2", "typescript": "^6.0.2",
"vite": "^8.0.7" "vite": "^8.0.7",
"vitest": "^4.1.3"
} }
} }

27
src/app.css Normal file
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@@ -0,0 +1,27 @@
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');
:global(body) {
margin: 0;
padding: 0;
font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
background: #f9fafb;
color: #1f2937;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
}
:global(*) {
box-sizing: border-box;
}
:global(h1, h2, h3, h4, h5, h6) {
margin: 0;
}
:global(button) {
font-family: inherit;
}
:global(textarea) {
font-family: inherit;
}

View File

@@ -1,5 +1,7 @@
<!doctype html> <!doctype html>
<html lang="en"> <html lang="en">
<head>
<title>English Style Converter</title>
<head> <head>
<meta charset="utf-8" /> <meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" /> <meta name="viewport" content="width=device-width, initial-scale=1" />

View File

@@ -1 +0,0 @@
<svg xmlns="http://www.w3.org/2000/svg" width="107" height="128" viewBox="0 0 107 128"><title>svelte-logo</title><path d="M94.157 22.819c-10.4-14.885-30.94-19.297-45.792-9.835L22.282 29.608A29.92 29.92 0 0 0 8.764 49.65a31.5 31.5 0 0 0 3.108 20.231 30 30 0 0 0-4.477 11.183 31.9 31.9 0 0 0 5.448 24.116c10.402 14.887 30.942 19.297 45.791 9.835l26.083-16.624A29.92 29.92 0 0 0 98.235 78.35a31.53 31.53 0 0 0-3.105-20.232 30 30 0 0 0 4.474-11.182 31.88 31.88 0 0 0-5.447-24.116" style="fill:#ff3e00"/><path d="M45.817 106.582a20.72 20.72 0 0 1-22.237-8.243 19.17 19.17 0 0 1-3.277-14.503 18 18 0 0 1 .624-2.435l.49-1.498 1.337.981a33.6 33.6 0 0 0 10.203 5.098l.97.294-.09.968a5.85 5.85 0 0 0 1.052 3.878 6.24 6.24 0 0 0 6.695 2.485 5.8 5.8 0 0 0 1.603-.704L69.27 76.28a5.43 5.43 0 0 0 2.45-3.631 5.8 5.8 0 0 0-.987-4.371 6.24 6.24 0 0 0-6.698-2.487 5.7 5.7 0 0 0-1.6.704l-9.953 6.345a19 19 0 0 1-5.296 2.326 20.72 20.72 0 0 1-22.237-8.243 19.17 19.17 0 0 1-3.277-14.502 17.99 17.99 0 0 1 8.13-12.052l26.081-16.623a19 19 0 0 1 5.3-2.329 20.72 20.72 0 0 1 22.237 8.243 19.17 19.17 0 0 1 3.277 14.503 18 18 0 0 1-.624 2.435l-.49 1.498-1.337-.98a33.6 33.6 0 0 0-10.203-5.1l-.97-.294.09-.968a5.86 5.86 0 0 0-1.052-3.878 6.24 6.24 0 0 0-6.696-2.485 5.8 5.8 0 0 0-1.602.704L37.73 51.72a5.42 5.42 0 0 0-2.449 3.63 5.79 5.79 0 0 0 .986 4.372 6.24 6.24 0 0 0 6.698 2.486 5.8 5.8 0 0 0 1.602-.704l9.952-6.342a19 19 0 0 1 5.295-2.328 20.72 20.72 0 0 1 22.237 8.242 19.17 19.17 0 0 1 3.277 14.503 18 18 0 0 1-8.13 12.053l-26.081 16.622a19 19 0 0 1-5.3 2.328" style="fill:#fff"/></svg>

Before

Width:  |  Height:  |  Size: 1.5 KiB

View File

@@ -0,0 +1,256 @@
<script lang="ts">
const loadingWords = [
'Bamboozling',
'Razzmatazzing',
'Transmogrifying',
'Alakazamming',
'Prestidigitating',
'Metamorphosizing',
'Enchanting',
'Voodooing',
'Witchcrafting',
'Sorcerizing',
'Spellcasting',
'Hocus-pocusing',
'Incantating',
'Conjurating',
'Charmweaving'
];
const colors = [
'coral',
'teal',
'violet',
'amber',
'emerald',
'rose',
'skyblue',
'fuchsia',
'orange',
'indigo'
];
const colorValues: Record<string, string> = {
coral: '#FF6B6B',
teal: '#2EC4B6',
violet: '#9B5DE5',
amber: '#F5B041',
emerald: '#2ECC71',
rose: '#E74C6F',
skyblue: '#5DADE2',
fuchsia: '#D63384',
orange: '#F39C12',
indigo: '#5B2C6F'
};
const animationStyles = [
'slide-up',
'bounce-in',
'drop-in',
'scale-up',
'fade-rotate',
'spring-left'
];
let currentWordIndex = $state(0);
let currentColor = $state(colors[0]);
let currentAnimation = $state('slide-up');
let letters = $state<string[]>([]);
$effect(() => {
const interval = setInterval(() => {
currentWordIndex = Math.floor(Math.random() * loadingWords.length);
currentColor = colors[Math.floor(Math.random() * colors.length)];
currentAnimation = animationStyles[Math.floor(Math.random() * animationStyles.length)];
letters = loadingWords[currentWordIndex].split('');
}, 2000);
// Initialize immediately
currentWordIndex = Math.floor(Math.random() * loadingWords.length);
currentColor = colors[Math.floor(Math.random() * colors.length)];
currentAnimation = animationStyles[Math.floor(Math.random() * animationStyles.length)];
letters = loadingWords[currentWordIndex].split('');
return () => clearInterval(interval);
});
</script>
<div class="modal-overlay" role="dialog" aria-label="Loading">
<div class="modal-content">
<div class="loading-letters" style="color: {colorValues[currentColor]}">
{#each letters as letter, i}
<span
class="letter {currentAnimation}"
style="--delay: {i * 60}ms; --color: {colorValues[currentColor]}"
>
{letter}
</span>
{/each}
</div>
<p class="loading-subtitle">Transforming your text...</p>
</div>
</div>
<style>
.modal-overlay {
position: fixed;
inset: 0;
background: rgba(255, 255, 255, 0.85);
backdrop-filter: blur(8px);
display: flex;
align-items: center;
justify-content: center;
z-index: 1000;
animation: fade-in 0.2s ease-out;
}
.modal-content {
text-align: center;
padding: 3rem;
}
.loading-letters {
font-size: clamp(2rem, 5vw, 3.5rem);
font-weight: 700;
letter-spacing: 0.05em;
min-height: 4rem;
display: flex;
justify-content: center;
flex-wrap: wrap;
}
.letter {
display: inline-block;
opacity: 0;
animation-fill-mode: forwards;
animation-duration: 0.4s;
animation-delay: var(--delay);
}
/* Slide up */
.slide-up {
animation-name: slide-up;
}
@keyframes slide-up {
from {
opacity: 0;
transform: translateY(30px);
}
to {
opacity: 1;
transform: translateY(0);
}
}
/* Bounce in */
.bounce-in {
animation-name: bounce-in;
}
@keyframes bounce-in {
0% {
opacity: 0;
transform: translateY(-40px);
}
60% {
opacity: 1;
transform: translateY(8px);
}
100% {
opacity: 1;
transform: translateY(0);
}
}
/* Drop in */
.drop-in {
animation-name: drop-in;
}
@keyframes drop-in {
0% {
opacity: 0;
transform: translateY(-60px);
}
70% {
opacity: 1;
transform: translateY(4px);
}
85% {
transform: translateY(-2px);
}
100% {
opacity: 1;
transform: translateY(0);
}
}
/* Scale up */
.scale-up {
animation-name: scale-up;
}
@keyframes scale-up {
from {
opacity: 0;
transform: scale(0.3);
}
to {
opacity: 1;
transform: scale(1);
}
}
/* Fade rotate */
.fade-rotate {
animation-name: fade-rotate;
}
@keyframes fade-rotate {
from {
opacity: 0;
transform: rotate(-15deg) scale(0.5);
}
to {
opacity: 1;
transform: rotate(0deg) scale(1);
}
}
/* Spring from left */
.spring-left {
animation-name: spring-left;
}
@keyframes spring-left {
0% {
opacity: 0;
transform: translateX(-40px);
}
70% {
opacity: 1;
transform: translateX(5px);
}
100% {
opacity: 1;
transform: translateX(0);
}
}
.loading-subtitle {
margin-top: 1rem;
color: #6b7280;
font-size: 1rem;
font-weight: 400;
}
@keyframes fade-in {
from {
opacity: 0;
}
to {
opacity: 1;
}
}
</style>

34
src/lib/llm.test.ts Normal file
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@@ -0,0 +1,34 @@
import { describe, it, expect } from 'vitest';
import { buildSystemPrompt, buildUserMessage } from '$lib/llm';
describe('buildSystemPrompt', () => {
it('fills in {style} placeholder from intensity instruction', () => {
const result = buildSystemPrompt(
'Rewrite in a sarcastic, snarky tone with biting wit',
'rewrite strongly in a {style} style'
);
expect(result).toContain('rewrite strongly in a Rewrite in a sarcastic, snarky tone with biting wit style');
expect(result).not.toContain('{style}');
});
it('includes the style modifier on its own line', () => {
const result = buildSystemPrompt('some modifier', 'lightly hint at a {style} tone');
expect(result).toContain('some modifier');
});
it('includes the core instruction text', () => {
const result = buildSystemPrompt('test', 'rewrite with a {style} tone');
expect(result).toContain('You are an expert English style converter');
expect(result).toContain('Output ONLY the converted text');
});
});
describe('buildUserMessage', () => {
it('returns the text as-is', () => {
expect(buildUserMessage('Hello world')).toBe('Hello world');
});
it('preserves whitespace', () => {
expect(buildUserMessage(' spaced ')).toBe(' spaced ');
});
});

77
src/lib/llm.ts Normal file
View File

@@ -0,0 +1,77 @@
import { env } from '$env/dynamic/private';
import type { LLMConfig } from './types';
const DEFAULT_CONFIG: LLMConfig = {
baseUrl: 'http://localhost:11434/v1',
apiKey: 'ollama',
model: 'llama3'
};
function getConfig(): LLMConfig {
return {
baseUrl: env.OPENAI_BASE_URL || DEFAULT_CONFIG.baseUrl,
apiKey: env.OPENAI_API_KEY || DEFAULT_CONFIG.apiKey,
model: env.OPENAI_MODEL || DEFAULT_CONFIG.model
};
}
export interface ConvertResult {
converted: string;
systemPrompt: string;
userMessage: string;
}
export function buildSystemPrompt(styleModifier: string, intensityInstruction: string): string {
const intensityFilled = intensityInstruction.replace('{style}', styleModifier);
return `You are an expert English style converter.
${intensityFilled}.
${styleModifier}
Preserve the core meaning but fully transform the voice and tone.
Output ONLY the converted text — no explanations, no labels, no quotes.`;
}
export function buildUserMessage(text: string): string {
return text;
}
export async function convertText(
text: string,
styleModifier: string,
intensityInstruction: string,
overrides?: Partial<LLMConfig>
): Promise<ConvertResult> {
const merged: LLMConfig = { ...DEFAULT_CONFIG, ...getConfig(), ...overrides };
const systemPrompt = buildSystemPrompt(styleModifier, intensityInstruction);
const userMessage = buildUserMessage(text);
const response = await fetch(`${merged.baseUrl}/chat/completions`, {
method: 'POST',
headers: {
'Content-Type': 'application/json',
Authorization: `Bearer ${merged.apiKey}`
},
body: JSON.stringify({
model: merged.model,
messages: [
{ role: 'system', content: systemPrompt },
{ role: 'user', content: userMessage }
],
temperature: 0.8
})
});
if (!response.ok) {
const errorText = await response.text().catch(() => 'Unknown error');
throw new Error(`LLM request failed (${response.status}): ${errorText}`);
}
const data = await response.json();
const converted = data.choices?.[0]?.message?.content?.trim();
if (!converted) {
throw new Error('LLM returned empty response');
}
return { converted, systemPrompt, userMessage };
}

112
src/lib/styles.test.ts Normal file
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@@ -0,0 +1,112 @@
import { describe, it, expect } from 'vitest';
import {
styles,
categories,
intensityMap,
getStylesByCategory,
getStyleById,
getCategoryById,
getIntensityConfig
} from '$lib/styles';
describe('styles', () => {
it('all styles have valid ids', () => {
for (const style of styles) {
expect(style.id).toBeTruthy();
expect(typeof style.id).toBe('string');
}
});
it('all styles have valid promptModifiers', () => {
for (const style of styles) {
expect(style.promptModifier).toBeTruthy();
expect(typeof style.promptModifier).toBe('string');
expect(style.promptModifier.length).toBeGreaterThan(5);
}
});
it('all styles reference existing categories', () => {
const categoryIds = new Set(categories.map((c) => c.id));
for (const style of styles) {
expect(categoryIds.has(style.categoryId)).toBe(true);
}
});
it('all style ids are unique', () => {
const ids = styles.map((s) => s.id);
const uniqueIds = new Set(ids);
expect(ids.length).toBe(uniqueIds.size);
});
});
describe('getStylesByCategory', () => {
it('returns styles for a known category', () => {
const result = getStylesByCategory('general');
expect(result.length).toBeGreaterThan(0);
for (const style of result) {
expect(style.categoryId).toBe('general');
}
});
it('returns empty array for unknown category', () => {
const result = getStylesByCategory('nonexistent');
expect(result).toEqual([]);
});
it('general category has 6 styles', () => {
const result = getStylesByCategory('general');
expect(result.length).toBe(6);
});
});
describe('getStyleById', () => {
it('returns a style for a valid id', () => {
const result = getStyleById('sarcastic');
expect(result).toBeDefined();
expect(result!.id).toBe('sarcastic');
});
it('returns undefined for unknown id', () => {
const result = getStyleById('nonexistent');
expect(result).toBeUndefined();
});
});
describe('getCategoryById', () => {
it('returns a category for a valid id', () => {
const result = getCategoryById('general');
expect(result).toBeDefined();
expect(result!.id).toBe('general');
});
it('returns undefined for unknown id', () => {
const result = getCategoryById('nonexistent');
expect(result).toBeUndefined();
});
});
describe('getIntensityConfig', () => {
it('returns config for valid intensity levels 1-5', () => {
for (let i = 1; i <= 5; i++) {
const config = getIntensityConfig(i);
expect(config).toBeDefined();
expect(config!.label).toBeTruthy();
expect(config!.instruction).toContain('{style}');
}
});
it('returns undefined for intensity 0', () => {
expect(getIntensityConfig(0)).toBeUndefined();
});
it('returns undefined for intensity 6', () => {
expect(getIntensityConfig(6)).toBeUndefined();
});
it('all intensity instructions contain {style} placeholder', () => {
for (let i = 1; i <= 5; i++) {
const config = getIntensityConfig(i);
expect(config!.instruction).toContain('{style}');
}
});
});

View File

@@ -40,7 +40,7 @@ export const styles: Style[] = [
{ id: 'gen-z', label: 'Gen Z Slang', categoryId: 'fun', promptModifier: 'Rewrite in Gen Z slang with no cap, fr, and modern internet vernacular' }, { id: 'gen-z', label: 'Gen Z Slang', categoryId: 'fun', promptModifier: 'Rewrite in Gen Z slang with no cap, fr, and modern internet vernacular' },
// Game of Thrones // Game of Thrones
{ id: 'got-kings-landing', label: "King's Landing", categoryId: 'got', promptModifier: 'Rewrite as a scheming noble from King'\''s Landing would speak' }, { id: 'got-kings-landing', label: "King's Landing", categoryId: 'got', promptModifier: 'Rewrite as a scheming noble from Kings Landing would speak' },
{ id: 'got-wildlings', label: 'Wildlings', categoryId: 'got', promptModifier: 'Rewrite in the rough, free-spirited manner of the Free Folk wildlings' }, { id: 'got-wildlings', label: 'Wildlings', categoryId: 'got', promptModifier: 'Rewrite in the rough, free-spirited manner of the Free Folk wildlings' },
{ id: 'got-winterfell', label: 'Winterfell', categoryId: 'got', promptModifier: 'Rewrite with the honor-bound stoicism of a Stark from Winterfell' }, { id: 'got-winterfell', label: 'Winterfell', categoryId: 'got', promptModifier: 'Rewrite with the honor-bound stoicism of a Stark from Winterfell' },

View File

@@ -1,11 +1,11 @@
<script lang="ts"> <script lang="ts">
import favicon from '$lib/assets/favicon.svg'; import '../app.css';
let { children } = $props(); let { children } = $props();
</script> </script>
<svelte:head> <svelte:head>
<link rel="icon" href={favicon} /> <link rel="icon" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='.9em' font-size='90'>✨</text></svg>" />
</svelte:head> </svelte:head>
{@render children()} {@render children()}

View File

@@ -1,2 +1,445 @@
<h1>Welcome to SvelteKit</h1> <script lang="ts">
<p>Visit <a href="https://svelte.dev/docs/kit">svelte.dev/docs/kit</a> to read the documentation</p> import { categories, styles, getStylesByCategory, getIntensityConfig } from '$lib/styles';
import type { Style, StyleCategory, ConversionResponse } from '$lib/types';
import LoadingModal from '$lib/components/LoadingModal.svelte';
let inputText = $state('');
let selectedCategoryId = $state('');
let selectedStyleId = $state('');
let intensity = $state(3);
let outputText = $state('');
let loading = $state(false);
let error = $state('');
let systemPrompt = $state('');
let userMessage = $state('');
let showPrompt = $state(false);
let copied = $state(false);
let availableStyles = $derived(
selectedCategoryId ? getStylesByCategory(selectedCategoryId) : []
);
let canConvert = $derived(
inputText.trim().length > 0 && selectedStyleId.length > 0 && !loading
);
let intensityLabel = $derived(getIntensityConfig(intensity)?.label ?? '');
function onCategoryChange() {
selectedStyleId = '';
if (availableStyles.length === 1) {
selectedStyleId = availableStyles[0].id;
}
}
async function handleConvert() {
if (!canConvert) return;
loading = true;
error = '';
outputText = '';
systemPrompt = '';
userMessage = '';
showPrompt = false;
try {
const res = await fetch('/api/convert', {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify({
text: inputText,
styleId: selectedStyleId,
intensity
})
});
const data = await res.json();
if (!res.ok) {
throw new Error(data.error || 'Conversion failed');
}
const result: ConversionResponse = data;
outputText = result.converted;
systemPrompt = result.systemPrompt;
userMessage = result.userMessage;
} catch (err) {
error = err instanceof Error ? err.message : 'Something went wrong';
} finally {
loading = false;
}
}
async function handleCopy() {
try {
await navigator.clipboard.writeText(outputText);
copied = true;
setTimeout(() => (copied = false), 2000);
} catch {
// Fallback: select text
const textarea = document.querySelector('.output-text');
if (textarea instanceof HTMLElement) {
const range = document.createRange();
range.selectNodeContents(textarea);
const sel = window.getSelection();
sel?.removeAllRanges();
sel?.addRange(range);
}
}
}
</script>
<main class="container">
<h1 class="title">English Style Converter</h1>
<p class="subtitle">Transform your text into different English styles and tones</p>
<div class="card">
<div class="form-group">
<label for="input-text">Your Text</label>
<textarea
id="input-text"
bind:value={inputText}
placeholder="Enter the English text you want to convert..."
rows="5"
disabled={loading}
></textarea>
</div>
<div class="selectors">
<div class="form-group">
<label for="category">Style Category</label>
<select
id="category"
bind:value={selectedCategoryId}
onchange={onCategoryChange}
disabled={loading}
>
<option value="">Choose a category...</option>
{#each categories as cat}
<option value={cat.id}>{cat.emoji} {cat.label}</option>
{/each}
</select>
</div>
<div class="form-group">
<label for="style">Style</label>
<select id="style" bind:value={selectedStyleId} disabled={loading || !selectedCategoryId}>
{#if !selectedCategoryId}
<option value="">Select a category first...</option>
{:else if availableStyles.length === 0}
<option value="">No styles available</option>
{:else}
<option value="">Choose a style...</option>
{#each availableStyles as style}
<option value={style.id}>{style.label}</option>
{/each}
{/if}
</select>
</div>
</div>
<div class="form-group">
<label for="intensity">
Intensity: <span class="intensity-label">{intensityLabel || 'Strong'}</span>
</label>
<div class="slider-row">
<span class="slider-end">Subtle</span>
<input
id="intensity"
type="range"
min="1"
max="5"
step="1"
bind:value={intensity}
disabled={loading}
/>
<span class="slider-end">Maximum</span>
</div>
</div>
<button class="convert-btn" onclick={handleConvert} disabled={!canConvert}>
{#if loading}
Converting...
{:else}
✨ Convert
{/if}
</button>
</div>
{#if error}
<div class="output-card error-card">
<p class="error-text">⚠️ {error}</p>
</div>
{/if}
{#if outputText}
<div class="output-card">
<div class="output-header">
<h3>Result</h3>
<button class="copy-btn" onclick={handleCopy}>
{#if copied}
✓ Copied!
{:else}
📋 Copy
{/if}
</button>
</div>
<div class="output-text">{outputText}</div>
</div>
<div class="prompt-section">
<button class="prompt-toggle" onclick={() => (showPrompt = !showPrompt)}>
{showPrompt ? '▼' : '▶'} Show prompt
</button>
{#if showPrompt}
<div class="prompt-content">
<div class="prompt-block">
<h4>System Prompt</h4>
<pre>{systemPrompt}</pre>
</div>
<div class="prompt-block">
<h4>User Message</h4>
<pre>{userMessage}</pre>
</div>
</div>
{/if}
</div>
{/if}
</main>
{#if loading}
<LoadingModal />
{/if}
<style>
.container {
max-width: 680px;
margin: 0 auto;
padding: 2rem 1.5rem;
min-height: 100vh;
}
.title {
font-size: 2rem;
font-weight: 800;
color: #1f2937;
text-align: center;
margin-bottom: 0.25rem;
}
.subtitle {
text-align: center;
color: #6b7280;
margin-bottom: 2rem;
font-size: 1.05rem;
}
.card {
background: #ffffff;
border: 1px solid #e5e7eb;
border-radius: 12px;
padding: 1.5rem;
box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}
.form-group {
margin-bottom: 1.25rem;
}
.form-group label {
display: block;
font-weight: 600;
font-size: 0.9rem;
color: #374151;
margin-bottom: 0.4rem;
}
textarea,
select {
width: 100%;
padding: 0.75rem;
border: 1px solid #d1d5db;
border-radius: 8px;
font-size: 0.95rem;
font-family: inherit;
background: #fafafa;
color: #1f2937;
transition: border-color 0.2s;
}
textarea:focus,
select:focus {
outline: none;
border-color: #3b82f6;
box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}
textarea {
resize: vertical;
min-height: 100px;
}
.selectors {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 1rem;
}
.intensity-label {
color: #3b82f6;
font-weight: 700;
}
.slider-row {
display: flex;
align-items: center;
gap: 0.75rem;
}
.slider-end {
font-size: 0.8rem;
color: #9ca3af;
white-space: nowrap;
}
input[type='range'] {
flex: 1;
accent-color: #3b82f6;
height: 6px;
}
.convert-btn {
width: 100%;
padding: 0.85rem;
background: #3b82f6;
color: #ffffff;
border: none;
border-radius: 8px;
font-size: 1.05rem;
font-weight: 700;
cursor: pointer;
transition: background 0.2s, opacity 0.2s;
}
.convert-btn:hover:not(:disabled) {
background: #2563eb;
}
.convert-btn:disabled {
opacity: 0.5;
cursor: not-allowed;
}
.output-card {
margin-top: 1.5rem;
background: #ffffff;
border: 1px solid #e5e7eb;
border-radius: 12px;
padding: 1.25rem;
box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}
.error-card {
border-color: #fca5a5;
background: #fef2f2;
}
.error-text {
color: #dc2626;
font-weight: 500;
}
.output-header {
display: flex;
justify-content: space-between;
align-items: center;
margin-bottom: 0.75rem;
}
.output-header h3 {
margin: 0;
font-size: 1.1rem;
color: #1f2937;
}
.copy-btn {
padding: 0.35rem 0.75rem;
background: #f3f4f6;
border: 1px solid #d1d5db;
border-radius: 6px;
font-size: 0.85rem;
cursor: pointer;
transition: background 0.2s;
}
.copy-btn:hover {
background: #e5e7eb;
}
.output-text {
white-space: pre-wrap;
line-height: 1.6;
color: #1f2937;
font-size: 1rem;
}
.prompt-section {
margin-top: 1rem;
}
.prompt-toggle {
background: none;
border: none;
color: #3b82f6;
font-size: 0.9rem;
font-weight: 600;
cursor: pointer;
padding: 0.5rem 0;
}
.prompt-toggle:hover {
text-decoration: underline;
}
.prompt-content {
margin-top: 0.75rem;
}
.prompt-block {
margin-bottom: 1rem;
}
.prompt-block h4 {
font-size: 0.85rem;
color: #6b7280;
margin-bottom: 0.4rem;
text-transform: uppercase;
letter-spacing: 0.05em;
}
.prompt-block pre {
background: #f9fafb;
border: 1px solid #e5e7eb;
border-radius: 8px;
padding: 0.75rem;
font-size: 0.85rem;
white-space: pre-wrap;
word-break: break-word;
color: #374151;
margin: 0;
}
@media (max-width: 600px) {
.selectors {
grid-template-columns: 1fr;
}
.container {
padding: 1rem;
}
.title {
font-size: 1.5rem;
}
}
</style>

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@@ -0,0 +1,62 @@
import { json } from '@sveltejs/kit';
import type { RequestHandler } from './$types';
import { getStyleById, getIntensityConfig } from '$lib/styles';
import { convertText } from '$lib/llm';
import type { ConversionRequest, ConversionResponse } from '$lib/types';
export const POST: RequestHandler = async ({ request }) => {
let body: ConversionRequest;
try {
body = await request.json();
} catch {
return json({ error: 'Invalid JSON body' }, { status: 400 });
}
const { text, styleId, intensity } = body;
// Validate text
if (!text || typeof text !== 'string' || text.trim().length === 0) {
return json({ error: 'Text is required and must be non-empty' }, { status: 400 });
}
// Validate styleId
if (!styleId || typeof styleId !== 'string') {
return json({ error: 'styleId is required' }, { status: 400 });
}
const style = getStyleById(styleId);
if (!style) {
return json({ error: `Unknown style: ${styleId}` }, { status: 400 });
}
// Validate intensity
if (typeof intensity !== 'number' || !Number.isInteger(intensity) || intensity < 1 || intensity > 5) {
return json({ error: 'Intensity must be an integer between 1 and 5' }, { status: 400 });
}
const intensityConfig = getIntensityConfig(intensity);
if (!intensityConfig) {
return json({ error: 'Invalid intensity level' }, { status: 400 });
}
try {
const result = convertText(text, style.promptModifier, intensityConfig.instruction);
// Await the promise
const { converted, systemPrompt, userMessage } = await result;
const response: ConversionResponse = {
original: text,
converted,
styleId,
intensity,
systemPrompt,
userMessage
};
return json(response);
} catch (err) {
const message = err instanceof Error ? err.message : 'LLM call failed';
return json({ error: `Failed to convert text: ${message}` }, { status: 502 });
}
};

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@@ -0,0 +1,69 @@
import { describe, it, expect, vi } from 'vitest';
// We test the validation logic by importing the handler indirectly
// Since SvelteKit route handlers are hard to unit test directly,
// we test the underlying functions that handle validation
import { getStyleById, getIntensityConfig } from '$lib/styles';
describe('API validation logic', () => {
it('returns undefined for invalid style id', () => {
expect(getStyleById('nonexistent')).toBeUndefined();
});
it('returns valid style for known id', () => {
expect(getStyleById('sarcastic')).toBeDefined();
});
it('returns undefined for out-of-range intensity', () => {
expect(getIntensityConfig(0)).toBeUndefined();
expect(getIntensityConfig(6)).toBeUndefined();
});
it('returns valid config for in-range intensity', () => {
for (let i = 1; i <= 5; i++) {
expect(getIntensityConfig(i)).toBeDefined();
}
});
describe('request body validation', () => {
it('rejects empty text', () => {
const text = '' as string;
expect(!text || text.trim().length === 0).toBe(true);
});
it('rejects whitespace-only text', () => {
const text = ' ';
expect(text.trim().length === 0).toBe(true);
});
it('rejects non-integer intensity', () => {
const intensity = 3.5;
expect(!Number.isInteger(intensity)).toBe(true);
});
it('rejects intensity below 1', () => {
const intensity = 0;
expect(intensity < 1).toBe(true);
});
it('rejects intensity above 5', () => {
const intensity = 6;
expect(intensity > 5).toBe(true);
});
it('accepts valid inputs', () => {
const text = 'Hello world';
const styleId = 'sarcastic';
const intensity = 3;
const style = getStyleById(styleId);
const intensityConfig = getIntensityConfig(intensity);
expect(text.trim().length > 0).toBe(true);
expect(style).toBeDefined();
expect(Number.isInteger(intensity)).toBe(true);
expect(intensity >= 1 && intensity <= 5).toBe(true);
expect(intensityConfig).toBeDefined();
});
});
});

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@@ -1,6 +1,20 @@
import { defineConfig } from 'vitest/config';
import { sveltekit } from '@sveltejs/kit/vite'; import { sveltekit } from '@sveltejs/kit/vite';
import { defineConfig } from 'vite';
export default defineConfig({ export default defineConfig({
plugins: [sveltekit()] plugins: [sveltekit()],
test: {
expect: { requireAssertions: true },
projects: [
{
extends: './vite.config.ts',
test: {
name: 'server',
environment: 'node',
include: ['src/**/*.{test,spec}.{js,ts}'],
exclude: ['src/**/*.svelte.{test,spec}.{js,ts}']
}
}
]
}
}); });