refactor: rewrite some code for java 8 compatibility

src/main/java/me/topchetoeu/jscript/common/Reading.java

@@ -5,6 +5,9 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.UncheckedIOException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
 
 public class Reading {
     private static final BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
@@ -13,12 +16,66 @@ public class Reading {
         return reader.readLine();
     }
 
-    public static String streamToString(InputStream in) {
+    public static byte[] streamToBytes(InputStream in) {
         try {
-            return new String(in.readAllBytes());
+            List<byte[]> bufs = null;
+            byte[] result = null;
+            int total = 0;
+            int n;
+
+            do {
+                var buf = new byte[8192];
+                int nread = 0;
+
+                // read to EOF which may read more or less than buffer size
+                while ((n = in.read(buf, nread, buf.length - nread)) > 0) {
+                    nread += n;
+                }
+
+                if (nread > 0) {
+                    if (Integer.MAX_VALUE - 8 - total < nread) throw new OutOfMemoryError("Required array size too large");
+                    if (nread < buf.length) buf = Arrays.copyOfRange(buf, 0, nread);
+                    total += nread;
+
+                    if (result == null) result = buf;
+                    else {
+                        if (bufs == null) {
+                            bufs = new ArrayList<>();
+                            bufs.add(result);
+                        }
+
+                        bufs.add(buf);
+                    }
+                }
+                // if the last call to read returned -1 or the number of bytes
+                // requested have been read then break
+            } while (n >= 0);
+
+            if (bufs == null) {
+                if (result == null) return new byte[0];
+                return result.length == total ? result : Arrays.copyOf(result, total);
+            }
+
+            result = new byte[total];
+
+            int offset = 0;
+            int remaining = total;
+
+            for (byte[] b : bufs) {
+                int count = Math.min(b.length, remaining);
+                System.arraycopy(b, 0, result, offset, count);
+                offset += count;
+                remaining -= count;
+            }
+
+            return result;
         }
         catch (IOException e) { throw new UncheckedIOException(e); }
     }
+    public static String streamToString(InputStream in) {
+        return new String(streamToBytes(in));
+    }
+    
     public static InputStream resourceToStream(String name) {
         return Reading.class.getResourceAsStream("/" + name);
     }

src/main/java/me/topchetoeu/jscript/common/environment/Environment.java

@@ -35,7 +35,7 @@ public class Environment {
         }
 
         if (!forceClone) {
-            if (parent == null && child == null) return Set.of();
+            if (parent == null && child == null) return new HashSet<>();
             if (parent == null && child != null) return child;
             if (parent != null && child == null) return parent;
         }

src/main/java/me/topchetoeu/jscript/common/json/JSON.java

@@ -1,7 +1,7 @@
 package me.topchetoeu.jscript.common.json;
 
 import java.math.BigDecimal;
-import java.util.Map;
+import java.util.HashMap;
 import java.util.stream.Collectors;
 
 import me.topchetoeu.jscript.common.parsing.Filename;
@@ -49,7 +49,7 @@ public class JSON {
 
         var values = new JSONMap();
 
-        if (src.is(i + n, "}")) return ParseRes.res(new JSONMap(Map.of()), n + 1);
+        if (src.is(i + n, "}")) return ParseRes.res(new JSONMap(new HashMap<>()), n + 1);
         while (true) {
             var name = parseString(src, i + n);
             if (!name.isSuccess()) return name.chainError(src.loc(i + n), "Expected an index");

src/main/java/me/topchetoeu/jscript/common/json/JSONList.java

@@ -1,14 +1,14 @@
 package me.topchetoeu.jscript.common.json;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collection;
-import java.util.List;
 import java.util.Map;
 
 public class JSONList extends ArrayList<JSONElement> {
     public JSONList() {}
     public JSONList(JSONElement ...els) {
-        super(List.of(els));
+        super(Arrays.asList(els));
     }
     public JSONList(Collection<JSONElement> els) {
         super(els);

src/main/java/me/topchetoeu/jscript/common/mapping/FunctionMap.java

@@ -1,6 +1,7 @@
 package me.topchetoeu.jscript.common.mapping;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -111,9 +112,9 @@ public class FunctionMap {
         return res;
     }
     public List<Location> breakpoints(Location start, Location end) {
-        if (!Objects.equals(start.filename(), end.filename())) return List.of();
+        if (!Objects.equals(start.filename(), end.filename())) return Arrays.asList();
         NavigableSet<Location> set = bpLocs.get(start.filename());
-        if (set == null) return List.of();
+        if (set == null) return Arrays.asList();
 
         if (start != null) set = set.tailSet(start, true);
         if (end != null) set = set.headSet(end, true);
@@ -153,7 +154,7 @@ public class FunctionMap {
     // }
 
     public FunctionMap clone() {
-        var res = new FunctionMap(Map.of(), Map.of(), localNames, captureNames);
+        var res = new FunctionMap(new HashMap<>(), new HashMap<>(), localNames, captureNames);
         res.pcToLoc.putAll(this.pcToLoc);
         res.bps.putAll(bps);
         res.bpLocs.putAll(bpLocs);

src/main/java/me/topchetoeu/jscript/common/parsing/Filename.java

@@ -1,7 +1,6 @@
 package me.topchetoeu.jscript.common.parsing;
 
 import java.io.File;
-import java.nio.file.Path;
 
 public class Filename {
     public final String protocol;
@@ -48,9 +47,12 @@ public class Filename {
         if (i >= 0) return new Filename(val.substring(0, i).trim(), val.substring(i + 3).trim());
         else return new Filename("file", val.trim());
     }
-    public static Path normalize(String path) {
-        return Path.of(Path.of("/" + path.trim().replace("\\", "/")).normalize().toString().substring(1));
-    }
+    // public static Path normalize(String path) {
+    //     // File file = new File("/" + path.trim().replace("\\", "/"));
+    //     // String normalizedPath = new File("/" + path.trim().replace("\\", "/")).getAbsolutePath().replaceFirst("^/", "").replace("\\", "/");
+    //     // return normalizedPath;
+    //     return Path.of(Path.of("/" + path.trim().replace("\\", "/")).normalize().toString().substring(1));
+    // }
     public static Filename fromFile(File file) {
         return new Filename("file", file.getAbsolutePath());
     }

src/main/java/me/topchetoeu/jscript/compilation/CompoundNode.java

@@ -1,6 +1,7 @@
 package me.topchetoeu.jscript.compilation;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 
 import me.topchetoeu.jscript.common.Instruction;
@@ -91,10 +92,10 @@ public class CompoundNode extends Node {
 
         if (prev instanceof CompoundNode comp) {
             var children = new ArrayList<Node>();
-            children.addAll(List.of(comp.statements));
+            children.addAll(Arrays.asList(comp.statements));
             children.add(curr.result);
 
-            return ParseRes.res(new CompoundNode(loc, comp.hasScope, children.toArray(Node[]::new)), n);
+            return ParseRes.res(new CompoundNode(loc, comp.hasScope, children.toArray(new Node[0])), n);
         }
         else return ParseRes.res(new CompoundNode(loc, false, prev, curr.result), n);
     }
@@ -126,6 +127,6 @@ public class CompoundNode extends Node {
             statements.add(res.result);
         }
 
-        return ParseRes.res(new CompoundNode(loc, true, statements.toArray(Node[]::new)).setEnd(src.loc(i + n - 1)), n);
+        return ParseRes.res(new CompoundNode(loc, true, statements.toArray(new Node[0])).setEnd(src.loc(i + n - 1)), n);
     }
 }

src/main/java/me/topchetoeu/jscript/compilation/FunctionArrowNode.java

@@ -1,6 +1,6 @@
 package me.topchetoeu.jscript.compilation;
 
-import java.util.List;
+import java.util.Arrays;
 
 import me.topchetoeu.jscript.common.Instruction;
 import me.topchetoeu.jscript.common.Instruction.BreakpointType;
@@ -48,7 +48,7 @@ public class FunctionArrowNode extends FunctionNode {
             n += singleParam.n;
             n += Parsing.skipEmpty(src, i + n);
 
-            params = new Parameters(List.of(singleParam.result));
+            params = new Parameters(Arrays.asList(singleParam.result));
         }
 
         if (!src.is(i + n, "=>")) return ParseRes.failed();

src/main/java/me/topchetoeu/jscript/compilation/JavaScript.java

@@ -1,7 +1,8 @@
 package me.topchetoeu.jscript.compilation;
 
 import java.util.ArrayList;
-import java.util.List;
+import java.util.Arrays;
+import java.util.HashSet;
 import java.util.Set;
 
 import me.topchetoeu.jscript.common.environment.Environment;
@@ -57,13 +58,13 @@ public final class JavaScript {
         }
     }
 
-    static final Set<String> reserved = Set.of(
+    static final Set<String> reserved = new HashSet<>(Arrays.asList(
         "true", "false", "void", "null", "this", "if", "else", "try", "catch",
         "finally", "for", "do", "while", "switch", "case", "default", "new",
         "function", "var", "return", "throw", "typeof", "delete", "break",
         "continue", "debugger", "implements", "interface", "package", "private",
         "protected", "public", "static", "arguments"
-    );
+    ));
 
     public static ParseRes<? extends Node> parseParens(Source src, int i) {
         int n = 0;
@@ -252,7 +253,7 @@ public final class JavaScript {
             list.add(res.result);
         }
 
-        return list.toArray(Node[]::new);
+        return list.toArray(new Node[0]);
     }
 
     public static boolean checkVarName(String name) {
@@ -260,7 +261,7 @@ public final class JavaScript {
     }
 
     public static CompileResult compile(Environment env, Node ...statements) {
-        var func = new FunctionValueNode(null, null, new Parameters(List.of()), new CompoundNode(null, true, statements), null);
+        var func = new FunctionValueNode(null, null, new Parameters(Arrays.asList()), new CompoundNode(null, true, statements), null);
         var res = func.compileBody(env, new FunctionScope(true), true, null, null);
         res.buildTask.run();
         return res;

src/main/java/me/topchetoeu/jscript/compilation/NodeChildren.java

@@ -87,7 +87,7 @@ public final class NodeChildren implements Iterable<Node> {
         }
 
         public final NodeChildren build() {
-            return new NodeChildren(slots.toArray(Slot[]::new));
+            return new NodeChildren(slots.toArray(new Slot[0]));
         }
     }
 }

src/main/java/me/topchetoeu/jscript/compilation/control/SwitchNode.java

@@ -189,8 +189,8 @@ public class SwitchNode extends Node {
 
         return ParseRes.res(new SwitchNode(
             loc, label.result, val.result, defaultI,
-            cases.toArray(SwitchCase[]::new),
-            statements.toArray(Node[]::new)
+            cases.toArray(new SwitchCase[0]),
+            statements.toArray(new Node[0])
         ), n);
     }
 }

src/main/java/me/topchetoeu/jscript/compilation/values/ArrayNode.java

@@ -76,6 +76,6 @@ public class ArrayNode extends Node {
             }
         }
 
-        return ParseRes.res(new ArrayNode(loc, values.toArray(Node[]::new)), n);
+        return ParseRes.res(new ArrayNode(loc, values.toArray(new Node[0])), n);
     }
 }

src/main/java/me/topchetoeu/jscript/compilation/values/ObjectNode.java

@@ -1,5 +1,6 @@
 package me.topchetoeu.jscript.compilation.values;
 
+import java.util.Arrays;
 import java.util.LinkedList;
 import java.util.List;
 
@@ -51,7 +52,7 @@ public class ObjectNode extends Node implements AssignTargetLike {
         }
 
         public PropertyMemberNode(Location loc, Location end, Node key, Pattern argument, CompoundNode body) {
-            super(loc, end, argument == null ? new Parameters(List.of()) : new Parameters(List.of(argument)), body);
+            super(loc, end, argument == null ? new Parameters(Arrays.asList()) : new Parameters(Arrays.asList(argument)), body);
             this.key = key;
             this.argument = argument;
         }

src/main/java/me/topchetoeu/jscript/compilation/values/operations/CallNode.java

@@ -159,7 +159,7 @@ public class CallNode extends Node {
             else return ParseRes.error(src.loc(i + n), "Expected an expression or a closing paren");
         }
 
-        return ParseRes.res(new CallNode(loc, false, prev, args.toArray(Node[]::new)), n);
+        return ParseRes.res(new CallNode(loc, false, prev, args.toArray(new Node[0])), n);
     }
     public static ParseRes<CallNode> parseNew(Source src, int i) {
         var n = Parsing.skipEmpty(src, i);

src/main/java/me/topchetoeu/jscript/compilation/values/operations/OperationNode.java

@@ -1,8 +1,8 @@
 package me.topchetoeu.jscript.compilation.values.operations;
 
+import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
-import java.util.Set;
 import java.util.stream.Collectors;
 
 import me.topchetoeu.jscript.common.Instruction;
@@ -120,7 +120,7 @@ public class OperationNode extends Node {
         this.args = args;
     }
 
-    private static final Map<String, OperatorFactory> factories = Set.of(
+    private static final Map<String, OperatorFactory> factories = Arrays.asList(
         new NormalOperatorFactory("*", 13, Operation.MULTIPLY),
         new NormalOperatorFactory("/", 12, Operation.DIVIDE),
         new NormalOperatorFactory("%", 12, Operation.MODULO),

src/main/java/me/topchetoeu/jscript/runtime/debug/DebugContext.java

@@ -1,6 +1,7 @@
 package me.topchetoeu.jscript.runtime.debug;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.HashMap;
 import java.util.List;
 import java.util.WeakHashMap;
@@ -71,7 +72,7 @@ public class DebugContext {
         return getMapOrEmpty(((CodeFunction)func).body);
     }
     public List<Frame> getStackFrames() {
-        if (debugger == null) return List.of();
+        if (debugger == null) return Arrays.asList();
         return this.debugger.getStackFrame();
     }
 

src/main/java/me/topchetoeu/jscript/runtime/debug/DebugHandler.java

@@ -1,5 +1,6 @@
 package me.topchetoeu.jscript.runtime.debug;
 
+import java.util.Arrays;
 import java.util.List;
 
 import me.topchetoeu.jscript.common.FunctionBody;
@@ -73,7 +74,7 @@ public interface DebugHandler {
             }
             @Override public void onSourceLoad(Filename filename, String source) { }
             @Override public void onFunctionLoad(FunctionBody body, FunctionMap map) { }
-            @Override public List<Frame> getStackFrame() { return List.of(); }
+            @Override public List<Frame> getStackFrame() { return Arrays.asList(); }
         };
     }
 }

src/main/java/me/topchetoeu/jscript/runtime/values/primitives/PrimitiveValue.java

@@ -1,5 +1,6 @@
 package me.topchetoeu.jscript.runtime.values.primitives;
 
+import java.util.HashSet;
 import java.util.Set;
 
 import me.topchetoeu.jscript.common.environment.Environment;
@@ -17,8 +18,8 @@ public abstract class PrimitiveValue extends Value {
     @Override public final boolean setPrototype(Environment env, ObjectValue val) { return false; }
 
     @Override public Member getOwnMember(Environment env, KeyCache key) { return null; }
-    @Override public Set<String> getOwnMembers(Environment env, boolean onlyEnumerable) { return Set.of(); }
-    @Override public Set<SymbolValue> getOwnSymbolMembers(Environment env, boolean onlyEnumerable) { return Set.of(); }
+    @Override public Set<String> getOwnMembers(Environment env, boolean onlyEnumerable) { return new HashSet<>(); }
+    @Override public Set<SymbolValue> getOwnSymbolMembers(Environment env, boolean onlyEnumerable) { return new HashSet<>(); }
 
     @Override public State getState() { return State.FROZEN; }