[scripting] Fix script resolver options parsing

#KT-49400 Fixed

libraries/scripting/dependencies/src/kotlin/script/experimental/dependencies/impl/SimpleExternalDependenciesResolverOptionsParser.kt

@@ -8,9 +8,23 @@ package kotlin.script.experimental.dependencies.impl
 import kotlin.script.experimental.api.*
 import kotlin.script.experimental.dependencies.ExternalDependenciesResolver
 
-private val nameRegex = Regex("^[^\\S\\r\\n]*([a-zA-Z][a-zA-Z0-9-_]*)\\b")
+private val nameRegex = Regex("^[^\\S\\r\\n]*([a-zA-Z][a-zA-Z0-9-_]*)[^\\S\\r\\n]?")
-private val valueRegex = Regex("^[^\\S\\r\\n]*([a-zA-Z0-9-_,]+)\\b")
+private val valueRegex = Regex("^[^\\S\\r\\n]*((([a-zA-Z0-9-_,/$.:])|(\\\\[\\\\ nt]))+)[^\\S\\r\\n]?")
 private val equalsRegex = Regex("^[^\\S\\r\\n]*=")
+private val escapeRegex = Regex("\\\\(.)")
+
+private fun String.unescape(): String {
+    return replace(escapeRegex) { match ->
+        when (val c = match.groups[1]!!.value.single()) {
+            '\\' -> "\\"
+            ' ' -> " "
+            'n' -> "\n"
+            't' -> "\t"
+            // Impossible situation: all possible values are mentioned in the regex
+            else -> error("Unknown escaped symbol: $c")
+        }
+    }
+}
 
 /**
  * Simple lightweight options parser for external dependency resolvers.
@@ -42,7 +56,7 @@ object SimpleExternalDependenciesResolverOptionsParser {
             }
 
         fun takeName(): Token.Name? = take(nameRegex)?.let { Token.Name(it.groups[1]!!.value) }
-        fun takeValue(): Token.Value? = take(valueRegex)?.let { Token.Value(it.groups[1]!!.value) }
+        fun takeValue(): Token.Value? = take(valueRegex)?.let { Token.Value(it.groups[1]!!.value.unescape()) }
         fun takeEquals(): Token.Equals? = take(equalsRegex)?.let { Token.Equals }
 
         fun hasFinished(): Boolean = remaining.isBlank()

libraries/scripting/dependencies/test/kotlin/script/experimental/test/ResolverOptionsTest.kt

@@ -65,6 +65,22 @@ class ResolverOptionsTest : TestCase() {
         assertEquals(options.flag("option3"), true)
     }
 
+    fun testParserAcceptsSpecialSymbols() {
+        val parser = SimpleExternalDependenciesResolverOptionsParser
+        val options = parser("option1=/User/path/file.kt option2=C:\\\\User\\\\file.pem option3=\$MY_ENV").valueOrThrow()
+        assertEquals(options.value("option1"), "/User/path/file.kt")
+        assertEquals(options.value("option2"), "C:\\User\\file.pem")
+        assertEquals(options.value("option3"), "\$MY_ENV")
+    }
+
+    fun testParserAcceptsValuesWithSpaces() {
+        val parser = SimpleExternalDependenciesResolverOptionsParser
+        val options = parser("option1= spaced\\ \\ value\\  option2=\\ x option3=line1\\nline2").valueOrThrow()
+        assertEquals(options.value("option1"), "spaced  value ")
+        assertEquals(options.value("option2"), " x")
+        assertEquals(options.value("option3"), "line1\nline2")
+    }
+
     fun testParserReturnsMixOfValuesAndFlags() {
         val parser = SimpleExternalDependenciesResolverOptionsParser
         val options = parser("option1 = hello option2 option3=world option4 option5 = false").valueOrThrow()