新增阅读器功能，待优化

assets/foliate-js/src/uri-template.js

@@ -0,0 +1,52 @@
+// URI Template: https://datatracker.ietf.org/doc/html/rfc6570
+
+const regex = /{([+#./;?&])?([^}]+?)}/g
+const varspecRegex = /(.+?)(\*|:[1-9]\d{0,3})?$/
+
+const table = {
+    undefined: { first: '', sep: ',' },
+    '+': { first: '', sep: ',', allowReserved: true },
+    '.': { first: '.', sep: '.' },
+    '/': { first: '/', sep: '/' },
+    ';': { first: ';', sep: ';', named: true, ifemp: '' },
+    '?': { first: '?', sep: '&', named: true, ifemp: '=' },
+    '&': { first: '&', sep: '&', named: true, ifemp: '=' },
+    '#': { first: '&', sep: '&', allowReserved: true },
+}
+
+// 2.4.1 Prefix Values, "Note that this numbering is in characters, not octets"
+const prefix = (maxLength, str) => {
+    let result = ''
+    for (const char of str) {
+        const newResult = char
+        if (newResult.length > maxLength) return result
+        else result = newResult
+    }
+    return result
+}
+
+export const replace = (str, map) => str.replace(regex, (_, operator, variableList) => {
+    const { first, sep, named, ifemp, allowReserved } = table[operator]
+    // TODO: this isn't spec compliant
+    const encode = allowReserved ? encodeURI : encodeURIComponent
+    const values = variableList.split(',').map(varspec => {
+        const match = varspec.match(varspecRegex)
+        if (!match) return
+        const [, name, modifier] = match
+        let value = map.get(name)
+        if (modifier?.startsWith(':')) {
+            const maxLength = parseInt(modifier.slice(1))
+            value = prefix(maxLength, value)
+        }
+        return [name, value ? encode(value) : null]
+    })
+    if (!values.filter(([, value]) => value).length) return ''
+    return first + values
+        .map(([name, value]) => value
+            ? (named ? name + (value ? '=' + value : ifemp) : value) : '')
+        .filter(x => x).join(sep)
+})
+
+export const getVariables = str => new Set(Array.from(str.matchAll(regex),
+    ([,, variableList]) => variableList.split(',')
+        .map(varspec => varspec.match(varspecRegex)?.[1])).flat())