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/*
* Copyright 2018 Allan Wang
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package ca.allanwang.kau.xml
import android.content.Context
import android.content.res.XmlResourceParser
import android.text.Html
import android.text.Spanned
import androidx.annotation.XmlRes
import ca.allanwang.kau.utils.use
import org.jetbrains.anko.doAsync
import org.jetbrains.anko.uiThread
import org.xmlpull.v1.XmlPullParser
/**
* Created by Allan Wang on 2017-07-30.
*/
/**
* Parse an xml asynchronously with two tags, <question>Text</question> and <answer>Text</answer>,
* and invoke the [callback] on the ui thread
*/
@Suppress("DEPRECATION")
fun Context.kauParseFaq(
@XmlRes xmlRes: Int,
/**
* If \n is used, it will automatically be converted to </br>
*/
parseNewLine: Boolean = true,
callback: (items: List<FaqItem>) -> Unit
) {
doAsync {
val items = mutableListOf<FaqItem>()
resources.getXml(xmlRes).use { parser: XmlResourceParser ->
var eventType = parser.eventType
var question: Spanned? = null
var flag = -1 //-1, 0, 1 -> invalid, question, answer
while (eventType != XmlPullParser.END_DOCUMENT) {
if (eventType == XmlPullParser.START_TAG) {
flag = when (parser.name) {
"question" -> 0
"answer" -> 1
else -> -1
}
} else if (eventType == XmlPullParser.TEXT) {
when (flag) {
0 -> {
question = Html.fromHtml(parser.text.replace("\n", if (parseNewLine) "<br/>" else ""))
flag = -1
}
1 -> {
items.add(
FaqItem(
items.size + 1,
question
?: throw IllegalArgumentException("KAU FAQ answer found without a question"),
Html.fromHtml(parser.text.replace("\n", if (parseNewLine) "<br/>" else ""))
)
)
question = null
flag = -1
}
}
}
eventType = parser.next()
}
}
uiThread { callback(items) }
}
}
data class FaqItem(val number: Int, val question: Spanned, val answer: Spanned)
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