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ref: regexReplace template values

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relikd
2025-11-04 16:49:31 +01:00
parent 802daebe56
commit 5250f48d38
1 changed files with 17 additions and 15 deletions
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30
src/PreviewGenerator.swift
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@@ -38,30 +38,32 @@ struct PreviewGenerator {
/// prepare html, replace values
func generate(template html: String, css: String) -> String {
let templateValues = data.merging(["CSS": css]) { (_, new) in new }
return html.regexReplace("__([^ _]{1,40}?)__") { templateValues[$0] }
}
}
// this is less efficient
// for (key, value) in templateValues {
// html = html.replacingOccurrences(of: "__\(key)__", with: value)
// }
extension String {
/// Replace regex-pattern with custom replacement.
/// @param pattern must include a regex group. (e.g. "a(b)c")
func regexReplace(_ pattern: String, with fn: (_ match: String) -> String?) -> String {
var rv = ""
var prevLoc = html.startIndex
let regex = try! NSRegularExpression(pattern: "__[^ _]{1,40}?__")
regex.enumerateMatches(in: html, range: NSRange(location: 0, length: html.count), using: { match, flags, stop in
let start = html.index(html.startIndex, offsetBy: match!.range.lowerBound)
let key = String(html[html.index(start, offsetBy: 2) ..< html.index(start, offsetBy: match!.range.length - 2)])
var prevLoc = self.startIndex
let regex = try! NSRegularExpression(pattern: pattern)
regex.enumerateMatches(in: self, range: NSRange(location: 0, length: self.count), using: { match, flags, stop in
let start = self.index(self.startIndex, offsetBy: match!.range.lowerBound)
// append unrelated text up to this key
rv.append(contentsOf: html[prevLoc ..< start])
prevLoc = html.index(start, offsetBy: match!.range.length)
rv.append(contentsOf: self[prevLoc ..< start])
prevLoc = self.index(start, offsetBy: match!.range.length)
// append key if exists (else remove template-key)
if let value = templateValues[key] {
let key = String(self[Range(match!.range(at: 1), in: self)!])
if let value = fn(key) {
rv.append(value)
} else {
// os_log(.debug, log: log, "unknown template key: %{public}@", key)
}
})
// append remaining text
rv.append(contentsOf: html[prevLoc ..< html.endIndex])
rv.append(contentsOf: self[prevLoc ..< self.endIndex])
return rv
}
}