123 lines
3.5 KiB
Kotlin
123 lines
3.5 KiB
Kotlin
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package jp.juggler.subwaytooter.mfm
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import jp.juggler.util.firstNonNull
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import java.util.*
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import java.util.regex.Pattern
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class NodeParseEnv(
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val useFunction: Boolean,
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private val parentNode: Node,
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val text: String,
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start: Int,
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val end: Int,
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) {
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private val childNodes = parentNode.childNodes
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private val allowInside: HashSet<NodeType> =
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mapAllowInside[parentNode.type] ?: hashSetOf()
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// 直前のノードの終了位置
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internal var lastEnd = start
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// 注目中の位置
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internal var pos: Int = 0
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// 直前のノードの終了位置から次のノードの開始位置の手前までをresultに追加する
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private fun closeText(endText: Int) {
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val length = endText - lastEnd
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if (length <= 0) return
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val textInside = text.substring(lastEnd, endText)
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childNodes.add(Node(NodeType.TEXT, arrayOf(textInside), null))
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}
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fun remainMatcher(pattern: Pattern) =
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MatcherCache.matcher(pattern, text, pos, end)
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fun parseInside() {
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if (allowInside.isEmpty()) return
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var i = lastEnd //スキャン中の位置
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while (i < end) {
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// 注目位置の文字に関連するパーサー
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val lastParsers = nodeParserMap[text[i].code]
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if (lastParsers == null) {
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++i
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continue
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}
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// パーサー用のパラメータを用意する
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// 部分文字列のコストは高くないと信じたい
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pos = i
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val detected = lastParsers.firstNonNull {
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val d = this.it()
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if (d == null) {
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null
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} else {
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val n = d.node
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if (!allowInside.contains(d.node.type)) {
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MisskeyMarkdownDecoder.log.w(
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"not allowed : ${parentNode.type} => ${n.type} ${
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text.substring(
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d.start,
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d.end
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)
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}"
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)
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null
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} else {
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d
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}
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}
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}
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if (detected == null) {
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++i
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continue
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}
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closeText(detected.start)
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childNodes.add(detected.node)
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i = detected.end
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lastEnd = i
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NodeParseEnv(
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useFunction,
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detected.node,
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detected.textInside,
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detected.startInside,
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detected.endInside
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).parseInside()
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}
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closeText(end)
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}
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fun makeDetected(
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type: NodeType,
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args: Array<String>,
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start: Int,
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end: Int,
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textInside: String,
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startInside: Int,
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lengthInside: Int,
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): NodeDetected {
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val node = Node(type, args, parentNode)
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if (MisskeyMarkdownDecoder.DEBUG) MisskeyMarkdownDecoder.log.d(
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"NodeDetected: ${node.type} inside=${
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textInside.substring(startInside, startInside + lengthInside)
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}"
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)
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return NodeDetected(
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node,
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start,
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end,
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textInside,
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startInside,
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lengthInside
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)
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}
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}
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