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package com.pitchedapps.frost.parsers
import org.jsoup.nodes.Document
/**
* Created by Allan Wang on 2017-10-06.
*
* Interface for a given parser
* Use cases should be attached as delegates to objects that implement this interface
*
* In all cases, parsing will be done from a JSoup document
* Variants accepting strings are also permitted, and they will be converted to documents accordingly
* The return type must be nonnull if no parsing errors occurred, as null signifies a parse error
* If null really must be allowed, use Optionals
*/
interface FrostParser<T> {
/**
* Extracts data from the JSoup document
* In some cases, the document can be created directly from a connection
* In other times, it needs to be created from scripts, which otherwise
* won't be parsed
*/
fun parse(doc: Document): T?
/**
* Parse a String input
*/
fun parse(text: String?): T?
/**
* Take in doc and emit debug output
*/
fun debug(doc: Document): String
/**
* Attempts to parse input and emit a debugger
*/
fun debug(text: String?): String
}
internal abstract class FrostParserBase<T> : FrostParser<T> {
override final fun parse(text: String?): T? {
text ?: return null
val doc = textToDoc(text) ?: return null
return parse(doc)
}
protected abstract fun textToDoc(text: String): Document?
override fun debug(text: String?): String {
val result = mutableListOf<String>()
result.add("Testing parser for ${this::class.java.simpleName}")
if (text == null) {
result.add("Null text input")
return result.joinToString("\n")
}
val doc = textToDoc(text)
if (doc == null) {
result.add("Null document from text")
return result.joinToString("\n")
}
return debug(doc, result)
}
override final fun debug(doc: Document): String {
val result = mutableListOf<String>()
result.add("Testing parser for ${this::class.java.simpleName}")
return debug(doc, result)
}
private fun debug(doc: Document, result: MutableList<String>): String {
val output = parse(doc)
if (output == null) {
result.add("Output is null")
return result.joinToString("\n")
} else {
result.add("Output is not null")
}
debugImpl(output, result)
return result.joinToString("\n")
}
protected abstract fun debugImpl(data: T, result: MutableList<String>)
}
object FrostRegex {
val epoch = Regex(":([0-9]+)")
val notifId = Regex("notif_id\":([0-9]+)")
val messageNotifId = Regex("thread_fbid_([0-9]+)")
val profilePicture = Regex("url\\(\"(.*?)\"\\)")
}
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