Merge pull request #600 from viperproject/meilers_noglobalstate

Removing global state

src/main/scala/viper/silver/ast/Position.scala

@@ -89,10 +89,10 @@ class IdentifierPosition(val file: Path, val start: HasLineColumn, val end: Opti
     file :: start :: end :: id :: Nil
 }
 
-object LineCol {
-  def apply(index: Int): (Int, Int) = {
+class LineCol(fp: FastParser) {
+  def getPos(index: Int): (Int, Int) = {
     // val Array(line, col) = ctx.input.prettyIndex(index).split(":").map(_.toInt)
-    val line_offset = FastParser._line_offset
+    val line_offset = fp._line_offset
     val result = java.util.Arrays.binarySearch(line_offset, index)
     if (result >= 0) {
       // Exact match

src/main/scala/viper/silver/ast/utility/Consistency.scala

@@ -8,7 +8,7 @@ package viper.silver.ast.utility
 
 import viper.silver.ast._
 import viper.silver.ast.utility.rewriter.Traverse
-import viper.silver.parser.FastParser
+import viper.silver.parser.{FastParser, FastParserCompanion}
 import viper.silver.verifier.ConsistencyError
 import viper.silver.{FastMessage, FastMessaging}
 
@@ -29,7 +29,7 @@ object Consistency {
     recordIfNot(suspect, !property, message)
 
   /** Names that are not allowed for use in programs. */
-  def reservedNames: Seq[String] = FastParser.keywords.toSeq
+  def reservedNames: Set[String] = FastParserCompanion.basicKeywords
 
   /** Returns true iff the string `name` is a valid identifier. */
   val identFirstLetter = "[a-zA-Z$_]"

src/main/scala/viper/silver/cfg/CfgTest.scala

@@ -36,7 +36,7 @@ object CfgTest {
   }
 
   private def parse[_: P](input: String, file: Path): Option[PProgram] = {
-    val result = FastParser.parse(input, file)
+    val result = new FastParser().parse(input, file)
     result match {
       case Parsed.Success(program@PProgram(_, _, _, _, _, _, _,_, errors), _) =>
         if (errors.isEmpty || errors.forall(_.isInstanceOf[ParseWarning])) Some(program)

src/main/scala/viper/silver/frontend/SilFrontend.scala

@@ -89,11 +89,12 @@ trait SilFrontend extends DefaultFrontend {
   /** For testing of plugin import feature */
   def defaultPluginCount: Int = defaultPlugins.size
 
+  protected val fp = new FastParser()
 
   protected var _plugins: SilverPluginManager = SilverPluginManager(defaultPlugins match {
     case Seq() => None
     case s => Some(s.mkString(":"))
-  })(reporter, logger, _config)
+  })(reporter, logger, _config, fp)
 
   def plugins: SilverPluginManager = _plugins
 
@@ -187,7 +188,7 @@ trait SilFrontend extends DefaultFrontend {
         val list = _config.plugin.toOption ++ defaultPlugins
         if (list.isEmpty) { None } else { Some(list.mkString(":")) }
       }
-      _plugins = SilverPluginManager(plugins)(reporter, logger, _config)
+      _plugins = SilverPluginManager(plugins)(reporter, logger, _config, fp)
     }
   }
 
@@ -233,7 +234,7 @@ trait SilFrontend extends DefaultFrontend {
     val file = _inputFile.get
     _plugins.beforeParse(input, isImported = false) match {
       case Some(inputPlugin) =>
-        val result = FastParser.parse(inputPlugin, file, Some(_plugins))
+        val result = fp.parse(inputPlugin, file, Some(_plugins))
           result match {
             case Parsed.Success(e@ PProgram(_, _, _, _, _, _, _, _, err_list), _) =>
               if (err_list.isEmpty || err_list.forall(p => p.isInstanceOf[ParseWarning])) {
@@ -243,7 +244,7 @@ trait SilFrontend extends DefaultFrontend {
               else Fail(err_list)
             case fail @ Parsed.Failure(_, index, extra) =>
               val msg = fail.trace().longAggregateMsg
-              val (line, col) = LineCol(index)
+              val (line, col) = fp.lineCol.getPos(index)
               Fail(List(ParseError(s"Expected $msg", SourcePosition(file, line, col))))
             //? val pos = extra.input.prettyIndex(index).split(":").map(_.toInt)
               //? Fail(List(ParseError(s"Expected $msg", SourcePosition(file, pos(0), pos(1)))))