Upstream AndroidX KlibDumpParser

compiler/util-klib-abi/src/org/jetbrains/kotlin/library/abi/parser/Cursor.kt

@@ -0,0 +1,90 @@
+/*
+ * Copyright 2024 The Android Open Source Project
+ *
+ * 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 org.jetbrains.kotlin.library.abi.parser
+
+internal class Cursor
+private constructor(private val lines: List<String>, rowIndex: Int = 0, columnIndex: Int = 0) {
+    constructor(text: String) : this(text.split("\n"))
+
+    var rowIndex: Int = rowIndex
+        private set
+
+    var columnIndex: Int = columnIndex
+        private set
+
+    val currentLine: String
+        get() = lines[rowIndex].slice(columnIndex until lines[rowIndex].length)
+
+    val offset = lines.subList(0, rowIndex).sumOf { it.length } + columnIndex
+
+    /** Check if we have passed the last line in [lines] and there is nothing left to parse */
+    fun isFinished() = rowIndex >= lines.size
+
+    fun nextLine() {
+        rowIndex++
+        columnIndex = 0
+        if (!isFinished()) {
+            skipInlineWhitespace()
+        }
+    }
+
+    fun parseSymbol(
+        pattern: Regex,
+        peek: Boolean = false,
+        skipInlineWhitespace: Boolean = true,
+    ): String? {
+        val match = pattern.find(currentLine)
+        return match?.value?.also {
+            if (!peek) {
+                val offset = it.length + currentLine.indexOf(it)
+                setColumn(columnIndex + offset)
+                if (skipInlineWhitespace) {
+                    skipInlineWhitespace()
+                }
+            }
+        }
+    }
+
+    fun parseValidIdentifier(peek: Boolean = false): String? =
+        parseSymbol(validIdentifierRegex, peek)
+
+    fun parseWord(peek: Boolean = false): String? = parseSymbol(wordRegex, peek)
+
+    fun copy() = Cursor(lines, rowIndex, columnIndex)
+
+    private fun setColumn(index: Int) {
+        columnIndex = index
+    }
+
+    internal fun skipInlineWhitespace() {
+        while (currentLine.firstOrNull()?.isWhitespace() == true) {
+            setColumn(columnIndex + 1)
+        }
+    }
+}
+
+// Match any '=' not followed by '...' because they're valid characters, but we don't want to
+// parse part of the parameter default symbol (=...) by accident. Otherwise match all non-illegal
+// characters
+private val validIdentifierRegex =
+    Regex(
+        """
+    ^((=(?!\s?\.\.\.)|[^.;\[\]/<>:\\(){}?=,&])+)
+    """
+            .trimIndent()
+    )
+private val wordRegex = Regex("[a-zA-Z]+")