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<script lang="ts">
import { onMount } from 'svelte';
import JSZip from 'jszip';
let fileInput: HTMLInputElement | null = null;
const handleFileUpload = async () => {
if (!fileInput || !fileInput.files || fileInput.files.length === 0) return;
const file = fileInput.files[0];
const reader = new FileReader();
reader.onload = async (event) => {
const zip = await JSZip.loadAsync((event.target as FileReader).result as ArrayBuffer);
const newZip = new JSZip();
for (const relativePath in zip.files) {
const zipEntry = zip.files[relativePath];
if (zipEntry.dir) {
newZip.folder(relativePath);
} else if (relativePath.endsWith('.xhtml') || relativePath.endsWith('.html')) {
newZip.file(relativePath, applyBionicReadingToHTML(await zipEntry.async('text')));
} else {
newZip.file(relativePath, await zipEntry.async('arraybuffer'));
}
}
downloadEPUB(
await newZip.generateAsync({ type: 'blob' }),
`${file.name.split('.epub')[0]}_hayai.epub`
);
};
reader.readAsArrayBuffer(file);
};
const applyBionicReadingToHTML = (content: string) => {
const contentParser = new DOMParser().parseFromString(content, 'text/html');
for (const paragraph of contentParser.getElementsByTagName('p'))
paragraph.innerHTML = applyBionicReadingToString(paragraph.textContent ?? '');
return contentParser.documentElement.outerHTML;
};
const applyBionicReadingToString = (text: string) =>
text
.split(/\s+/)
.map((word) => {
if (/^\W+$/.test(word) || word.length <= 2) return word;
let boldLength;
if (word.length <= 4) {
boldLength = 2;
} else if (word.length <= 7) {
boldLength = 3;
} else if (word.length <= 10) {
boldLength = 4;
} else {
boldLength = Math.ceil(word.length * 0.5);
}
return `<strong>${word.slice(0, boldLength)}</strong>${word.slice(boldLength)}`;
})
.join(' ');
const downloadEPUB = (blob: Blob | MediaSource, fileName: string) => {
const link = document.createElement('a');
link.href = URL.createObjectURL(blob);
link.download = fileName;
link.click();
URL.revokeObjectURL(link.href);
};
onMount(() => (fileInput = document.getElementById('epub-file') as HTMLInputElement));
</script>
<div class="card">
{@html applyBionicReadingToString('Upload an EPUB, receive a "bionic" EPUB.')}
<br />
<small>
{@html applyBionicReadingToString(
"Bionic reading is a method of displaying text that aims to enhance readability and reading speed by guiding the reader's eyes using artificial fixation points."
)}
</small>
<p />
<input type="file" id="epub-file" accept=".epub" on:change={handleFileUpload} />
</div>
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