#364 | Add utility for encoding path string

Author: PatilShreyas

core/src/main/kotlin/com/tschuchort/compiletesting/EncodingUtils.kt

@@ -0,0 +1,79 @@
+package com.tschuchort.compiletesting
+
+import java.io.ByteArrayOutputStream
+import java.nio.charset.StandardCharsets
+
+/**
+ * Encode the given URI [path] with UTF_8 encoding
+ */
+fun encodePath(path: String): String {
+    if (path.isBlank()) {
+        return path
+    }
+    val bytes = path.encodeToByteArray()
+    var alreadyEncoded = true
+    for (b in bytes) {
+        if (!isValidEncodedChar(b.toInt())) {
+            alreadyEncoded = false
+            break
+        }
+    }
+    if (alreadyEncoded) {
+        return path
+    }
+
+    val baos = ByteArrayOutputStream(bytes.size)
+    for (b in bytes) {
+        val byte = b.toInt()
+        if (isValidEncodedChar(byte)) {
+            baos.write(byte)
+        } else {
+            baos.write('%'.code)
+            val hex1 = Character.forDigit(/* digit = */ b.toInt() shr 4 and 0xF, /* radix = */ 16).uppercaseChar()
+            val hex2 = Character.forDigit(/* digit = */ b.toInt() and 0xF, /* radix = */ 16).uppercaseChar()
+            baos.write(hex1.code)
+            baos.write(hex2.code)
+        }
+    }
+    return baos.toString(StandardCharsets.UTF_8.toString())
+}
+
+/**
+ * Checks whether input char [c] is valid and already an encoded character or not.
+ */
+fun isValidEncodedChar(c: Int): Boolean {
+    return isPchar(c) || '/'.code == c
+}
+
+/**
+ * Indicates whether the given character is in the {@code pchar} set.
+ * @see <a href="https://www.ietf.org/rfc/rfc3986.txt">RFC 3986, appendix A</a>
+ */
+fun isPchar(c: Int): Boolean {
+    return (isUnreserved(c) || isSubDelimiter(c) || ':'.code == c || '@'.code == c)
+}
+
+/**
+ * Indicates whether the given character is in the `sub-delims` set.
+ * @see <a href="https://www.ietf.org/rfc/rfc3986.txt">RFC 3986, appendix A</a>
+ */
+fun isSubDelimiter(c: Int): Boolean {
+    return '!'.code == c || '$'.code == c || '&'.code == c || '\''.code == c || '('.code == c || ')'.code == c || '*'.code == c || '+'.code == c || ','.code == c || ';'.code == c || '='.code == c
+}
+
+/**
+ * Indicates whether the given character is in the `unreserved` set.
+ * @see <a href="https://www.ietf.org/rfc/rfc3986.txt">RFC 3986, appendix A</a>
+ */
+fun isUnreserved(c: Int): Boolean {
+    return isAlpha(c) || Character.isDigit(c) || '-'.code == c || '.'.code == c || '_'.code == c || '~'.code == c
+}
+
+/**
+ * Indicates whether the given character is in the `ALPHA` set.
+ * @see <a href="https://www.ietf.org/rfc/rfc3986.txt">RFC 3986, appendix A</a>
+ */
+fun isAlpha(c: Int): Boolean {
+    return c >= 'a'.code && c <= 'z'.code || c >= 'A'.code && c <= 'Z'.code
+}
+