commit bce3396cf5af9474add171ac548717efb101b621
Author: Parker TenBroeck <51721964+ParkerTenBroeck@users.noreply.github.com>
Date: Thu Apr 3 00:22:50 2025 -0400
first
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..e80d5dc
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,31 @@
+### IntelliJ IDEA ###
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
+
+*.iml
diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 0000000..26d3352
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000..454992c
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,6 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
new file mode 100644
index 0000000..0033e36
--- /dev/null
+++ b/.idea/modules.xml
@@ -0,0 +1,8 @@
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..94a25f7
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/src/Main.java b/src/Main.java
new file mode 100644
index 0000000..d5238c9
--- /dev/null
+++ b/src/Main.java
@@ -0,0 +1,5 @@
+public class Main {
+ public static void main(String[] args) {
+ System.out.println("Hello, World!");
+ }
+}
\ No newline at end of file
diff --git a/src/generator/Fun.java b/src/generator/Fun.java
new file mode 100644
index 0000000..c3f3829
--- /dev/null
+++ b/src/generator/Fun.java
@@ -0,0 +1,468 @@
+package generator;
+
+
+import java.io.IOException;
+import java.io.PrintStream;
+import java.lang.classfile.*;
+import java.lang.classfile.attribute.StackMapFrameInfo;
+import java.lang.classfile.instruction.*;
+import java.lang.constant.ClassDesc;
+import java.lang.constant.ConstantDescs;
+import java.lang.constant.MethodTypeDesc;
+import java.lang.reflect.AccessFlag;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Objects;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import static java.lang.classfile.attribute.StackMapFrameInfo.SimpleVerificationTypeInfo.TOP;
+
+public class Fun {
+ public static void main(String... args) throws Exception {
+// var loader = new GeneratorClassLoader(Fun.class.getClassLoader());
+// loader.loadClass(Fun.class.getName()).getMethod("run").invoke(null);
+ var thread = new Thread(() -> {
+ Fun.run();
+ });
+ thread.setContextClassLoader(new GeneratorClassLoader(Fun.class.getClassLoader()));
+ thread.start();
+ }
+
+ public static void run() {
+ {
+ var gen = Test.test(new double[]{1,2,3,45,6,4,3,3,452,452,45,345,45});
+ while (gen.next() instanceof Gen.Yield(var val)) {
+ System.out.println(val);
+ }
+ }
+
+ var gen = Test.parse("f7(x,y,z,w, u,v, othersIg) = v-(x*y+y+ln(z)^2*sin(z*pi/2))/(w*u)+sqrt(othersIg*120e-1)");
+ var res = gen.next();
+ while (true) {
+ System.out.println(res);
+ if (res instanceof Gen.Ret || res == null) break;
+ res = gen.next();
+ }
+ }
+
+ public static class GeneratorClassLoader extends ClassLoader {
+ private final static MethodTypeDesc MTD_void_String = MethodTypeDesc.of(ConstantDescs.CD_void, ConstantDescs.CD_String);
+ private final static ClassDesc CD_System = ClassDesc.ofDescriptor(System.class.descriptorString());
+ private final static ClassDesc CD_PrintStream = ClassDesc.ofDescriptor(PrintStream.class.descriptorString());
+
+ private final static ClassDesc CD_Gen = ClassDesc.ofDescriptor(Gen.class.descriptorString());
+ private final static ClassDesc CD_Res = ClassDesc.ofDescriptor(Gen.Res.class.descriptorString());
+ private final static ClassDesc CD_Yield = ClassDesc.ofDescriptor(Gen.Yield.class.descriptorString());
+ private final static ClassDesc CD_Ret = ClassDesc.ofDescriptor(Gen.Ret.class.descriptorString());
+ private final static MethodTypeDesc MTD_Res = MethodTypeDesc.of(CD_Res);
+ private final static MethodTypeDesc MTD_Gen_Obj = MethodTypeDesc.of(CD_Gen, ConstantDescs.CD_Object);
+
+ private final HashMap customClazzDefMap = new HashMap<>();
+ private final HashMap> customClazzMap = new HashMap<>();
+
+ public GeneratorClassLoader(ClassLoader parent) {
+ super(parent);
+ }
+
+ @Override
+ public Class loadClass(String name) throws ClassNotFoundException {
+ if (customClazzDefMap.get(name) instanceof byte[] bytes)
+ customClazzMap.put(name, defineClass(name, bytes, 0, bytes.length));
+ if (customClazzMap.get(name) instanceof Class clazz)
+ return clazz;
+ if (name.startsWith("java"))
+ return super.loadClass(name);
+
+ var p = "/" + name.replace('.', '/') + ".class";
+ try (var stream = Fun.class.getResourceAsStream(p)) {
+ var bytes = Objects.requireNonNull(stream).readAllBytes();
+ bytes = searchForGenerators(bytes);
+ Files.write(Path.of("cs/" + name + ".class"), bytes);
+ customClazzDefMap.put(name, bytes);
+ customClazzMap.put(name, defineClass(name, bytes, 0, bytes.length));
+ return customClazzMap.get(name);
+ } catch (IOException e) {
+ throw new ClassNotFoundException(name, e);
+ }
+ }
+
+ public byte[] searchForGenerators(byte[] in) {
+ var clm = ClassFile.of().parse(in);
+ return ClassFile.of().build(clm.thisClass().asSymbol(), cb -> {
+ for (var ce : clm) {
+ var isGen = clm.thisClass().asSymbol().descriptorString().equals(Gen.class.descriptorString());
+ if (ce instanceof MethodModel mem && !isGen) {
+ var methodRetGen = mem.methodTypeSymbol().returnType().descriptorString().equals(Gen.class.descriptorString());
+ if (methodRetGen) {
+ cb.withMethod(mem.methodName().stringValue(), mem.methodTypeSymbol(), mem.flags().flagsMask(), mb -> {
+ for (var me : mem) {
+ if (me instanceof CodeModel com) {
+ mb.withCode(cob -> rebuildGeneratorMethod(clm, mem, com, cob));
+ } else mb.with(me);
+ }
+ });
+ } else
+ cb.with(mem);
+
+
+ } else cb.with(ce);
+ }
+ });
+ }
+
+ private ClassDesc generateGeneratorFromGenMethod(ClassModel clm, MethodModel mem, CodeModel com, CodeBuilder scob) {
+ var cd = ClassDesc.of("Gen" + customClazzDefMap.size());
+
+ var bytes = ClassFile.of(ClassFile.StackMapsOption.STACK_MAPS_WHEN_REQUIRED).build(cd, clb -> {
+
+ clb.withInterfaces(List.of(clb.constantPool().classEntry(CD_Gen)));
+
+ scob.new_(cd).dup();
+ var mts = mem.methodTypeSymbol();
+ mts = mts.changeReturnType(ConstantDescs.CD_void);
+ if (!mem.flags().has(AccessFlag.STATIC)) {
+ mts = mts.insertParameterTypes(0, clm.thisClass().asSymbol());
+ }
+
+ int offset = 0;
+ var mts_params = mts.parameterArray();
+ for (var param : mts_params) {
+ clb.withField("param_" + offset, param, ClassFile.ACC_PRIVATE);
+ var tk = TypeKind.fromDescriptor(param.descriptorString());
+ scob.loadLocal(tk, offset);
+ offset += tk.slotSize();
+ }
+ var count = offset;
+ scob.invokespecial(cd, ConstantDescs.INIT_NAME, mts).areturn();
+
+
+ clb.withMethod(ConstantDescs.INIT_NAME, mts, ClassFile.ACC_PUBLIC,
+ mb -> mb.withCode(cob -> {
+ cob.aload(0).invokespecial(ConstantDescs.CD_Object, ConstantDescs.INIT_NAME, ConstantDescs.MTD_void);
+ int offset2 = 0;
+ for (var param : mts_params) {
+ var tk = TypeKind.fromDescriptor(param.descriptorString());
+ cob.aload(0).loadLocal(tk, offset2 + 1).putfield(cd, "param_" + offset2, param);
+ offset2 += tk.slotSize();
+ }
+ cob.return_();
+ })
+ );
+ clb.withMethod("next", MTD_Res, ClassFile.ACC_PUBLIC, mb -> {
+ mb.withCode(cob -> cob.trying(
+ tcob -> {
+ generateStateMachine(mts_params, cd, clb, com, tcob, count);
+ },
+ ctb -> ctb.catchingAll(
+ blc -> blc.aload(0).loadConstant(-1).putfield(cd, "___state___", TypeKind.INT.upperBound()).athrow()
+ )
+ ).aconst_null().areturn()
+ );
+ });
+ }
+ );
+ try {
+ Files.write(Path.of("cs/" + cd.displayName() + ".class"), bytes);
+ } catch (IOException e) {
+ throw new RuntimeException(e);
+ }
+ customClazzDefMap.put(cd.displayName(), bytes);
+ return cd;
+ }
+
+ private static class LocalTracker{
+
+ record LocalStore(String name, ClassDesc cd){}
+
+ HashMap parameter_map = new HashMap<>();
+
+ HashMap localVarTypes = new HashMap<>();
+ HashMap localVarDetailedType = new HashMap<>();
+ HashMap stackMapFrames = new HashMap<>();
+ StackMapFrameInfo currentFrame;
+ ArrayList localStore = new ArrayList<>();
+
+
+ private LocalTracker(ClassDesc[] mts_params, ClassDesc cd, ClassBuilder clb, CodeModel com, CodeBuilder cob, int count){
+ int offset = 0;
+ for (var param : mts_params) {
+ parameter_map.put(offset, param);
+ offset += TypeKind.from(param).slotSize();
+ }
+
+ for(var attr : com.findAttributes(Attributes.stackMapTable())){
+ var entries = new ArrayList();
+ for(var smfi : attr.entries()){
+ var locals = new ArrayList<>(smfi.locals());
+ for(int i = 0; i < mts_params.length; i ++) locals.removeFirst();
+ locals.addFirst(StackMapFrameInfo.ObjectVerificationTypeInfo.of(cd));
+ entries.add(StackMapFrameInfo.of(smfi.target(), locals, smfi.stack()));
+ stackMapFrames.put(smfi.target(), entries.getLast());
+ }
+ }
+ }
+
+
+ //Tries its best to reuse old saved locals field slots, only reuses if types exactly match
+ public void savingLocals(ClassDesc cd, CodeBuilder cob, Runnable run) {
+ record Saved(int slot, String name, ClassDesc cd){};
+ var saved = new ArrayList();
+ var lls = new ArrayList<>(localStore);
+ foreach((slot, tk, desc) -> {
+ String name = null;
+ for(int i = 0; i < lls.size(); i ++)
+ if(lls.get(i).cd.equals(desc)){
+ name = lls.get(i).name;
+ lls.remove(i);
+ break;
+ }
+ if(name==null){
+ name = "local_" + localStore.size();
+ localStore.add(new LocalStore(name, desc));
+ }
+ saved.add(new Saved(slot, name, desc));
+ cob.aload(0).loadLocal(tk, slot).putfield(cd, name, desc);
+ });
+ run.run();
+
+ for(var save : saved){
+ cob.aload(0).getfield(cd, save.name, save.cd).storeLocal(TypeKind.from(save.cd), save.slot);
+ }
+ }
+
+ public void createLocalStoreFields(ClassBuilder clb){
+ for (var local : localStore) {
+ clb.withField(local.name, local.cd, ClassFile.ACC_PRIVATE);
+ }
+ }
+
+ public void encounterLabel(Label l){
+ var tmp = stackMapFrames.get(l);
+ if(tmp!=null){
+ localVarTypes.clear();
+ localVarDetailedType.clear();
+ currentFrame=tmp;
+ }
+ }
+
+ public ClassDesc paramType(int slot){
+ return parameter_map.get(slot);
+ }
+
+ public void addDetailedLocal(int slot, ClassDesc desc) {
+ localVarDetailedType.put(slot, desc);
+ }
+
+ public void addLocal(int slot, TypeKind typeKind) {
+ var prev = localVarTypes.put(slot, typeKind);
+ }
+
+ interface LocalConsumer{
+ void consume(int slot, TypeKind tk, ClassDesc desc);
+ }
+
+ void foreach(LocalConsumer consumer){
+ var slot = 0;
+ if(currentFrame!=null)
+ for(var kind : currentFrame.locals()){
+ switch(kind){
+ case StackMapFrameInfo.ObjectVerificationTypeInfo o -> {
+ if(slot!=0)
+ consumer.consume(slot, o.className().typeKind(), o.classSymbol());
+ slot += 1;
+ }
+ case StackMapFrameInfo.SimpleVerificationTypeInfo ti -> {
+ if(kind==TOP) {
+ slot += 1;
+ if(localVarTypes.get(slot-1) instanceof TypeKind tk){
+ ClassDesc cd = tk.upperBound();
+ if(localVarDetailedType.get(slot-1) instanceof ClassDesc cld)
+ cd = cld;
+ consumer.consume(slot-1, tk, cd);
+ }
+ continue;
+ }
+ var type = switch(ti){
+ case INTEGER -> TypeKind.INT;
+ case FLOAT -> TypeKind.FLOAT;
+ case DOUBLE -> TypeKind.DOUBLE;
+ case LONG -> TypeKind.LONG;
+ case NULL -> TypeKind.REFERENCE;
+ default ->
+ throw new IllegalStateException();
+ };
+ consumer.consume(slot, type, type.upperBound());
+ slot += 1;
+ }
+ case StackMapFrameInfo.UninitializedVerificationTypeInfo _ ->
+ throw new IllegalStateException();
+ }
+ }
+ for(var entry : localVarTypes.entrySet()){
+ if(entry.getKey()();
+ var invalidState = cob.newLabel();
+ stateSwitchCases.add(SwitchCase.of(0, cob.newLabel()));
+ int switchCase = 1;
+ for (CodeElement coe : com){
+ if(coe instanceof InvokeInstruction is && is.opcode().equals(Opcode.INVOKESTATIC) && is.owner().asSymbol().equals(CD_Gen) && (is.name().equalsString("yield"))){
+ stateSwitchCases.add(SwitchCase.of(switchCase, cob.newLabel()));
+ switchCase++;
+ }
+ }
+ cob.aload(0).getfield(cd, "___state___", TypeKind.INT.upperBound()).lookupswitch(invalidState, stateSwitchCases);
+ var start = cob.startLabel();
+ var end = cob.newLabel();
+ cob.localVariable(0, "this", cd, start, end);
+
+ var localTracker = new LocalTracker(mts_params, cd,clb,com,cob,count);
+
+ switchCase = 1;
+ cob.labelBinding(stateSwitchCases.removeFirst().target());
+ final boolean[] ignore_next_return = {false};
+ final boolean[] ignore_next_pop = {false};
+ for (CodeElement coe : com) {
+ switch(coe){
+ case Instruction ins when ins.opcode() == Opcode.POP && ignore_next_pop[0] -> {
+ ignore_next_pop[0] = false;
+ continue;
+ }
+ case ReturnInstruction _ when ignore_next_return[0] -> {
+ ignore_next_return[0] = false;
+ continue;
+ }
+ case Instruction _ when ignore_next_return[0] || ignore_next_pop[0] ->
+ throw new RuntimeException();
+
+ case Label l -> {
+ localTracker.encounterLabel(l);
+ }
+
+ default -> {}
+ }
+ switch (coe) {
+ case InvokeInstruction is when is.opcode().equals(Opcode.INVOKESTATIC) && is.owner().asSymbol().equals(CD_Gen) && (is.name().equalsString("yield") || is.name().equalsString("ret")) -> {
+ if (MethodTypeDesc.ofDescriptor(is.method().type().stringValue()).parameterArray().length == 0) {
+ cob.aconst_null();
+ }
+
+ if (is.name().equalsString("ret")) {
+ cob.aload(0).loadConstant(-1).putfield(cd, "___state___", TypeKind.INT.upperBound())
+ .new_(CD_Ret)
+ .dup_x1()
+ .swap()
+ .invokespecial(CD_Ret, ConstantDescs.INIT_NAME, MethodTypeDesc.of(ConstantDescs.CD_void, ConstantDescs.CD_Object))
+ .areturn();
+ ignore_next_return[0] = true;
+ } else {
+ int finalSwitchCase = switchCase;
+ switchCase++;
+ localTracker.savingLocals(cd, cob, () -> {
+ cob.aload(0).loadConstant(finalSwitchCase).putfield(cd, "___state___", TypeKind.INT.upperBound())
+ .new_(CD_Yield)
+ .dup_x1()
+ .swap()
+ .invokespecial(CD_Yield, ConstantDescs.INIT_NAME, MethodTypeDesc.of(ConstantDescs.CD_void, ConstantDescs.CD_Object))
+ .areturn();
+ cob.labelBinding(stateSwitchCases.removeFirst().target());
+ });
+
+ ignore_next_pop[0] = true;
+ }
+ }
+ case BranchInstruction b -> cob.with(b);
+ case LocalVariable lv when lv.slot() < count -> {}
+ case LocalVariable lv -> {
+ cob.localVariable(lv.slot() - count + 1, lv.name(), lv.type(), lv.startScope(), lv.endScope());
+ //this might be useful to add?
+// localTracker.addDetailedLocal(lv.slot() - count + 1, lv.typeSymbol());
+ }
+
+ case IncrementInstruction ii when ii.slot() < count -> throw new RuntimeException();
+ case IncrementInstruction ii -> cob.iinc(ii.slot() - count + 1, ii.constant());
+
+ case LoadInstruction li when li.slot() < count ->
+ cob.aload(0).getfield(cd, "param_" + li.slot(), localTracker.paramType(li.slot()));
+ case LoadInstruction li ->
+ cob.loadLocal(li.typeKind(), li.slot() - count + 1);
+
+ case StoreInstruction ls when ls.slot() < count && ls.typeKind().slotSize()==2 ->
+ cob.aload(0).dup_x2().pop().putfield(cd, "param_" + ls.slot(), localTracker.paramType(ls.slot()));
+ case StoreInstruction ls when ls.slot() < count ->
+ cob.aload(0).swap().putfield(cd, "param_" + ls.slot(), localTracker.paramType(ls.slot()));
+
+ case StoreInstruction ls -> {
+ localTracker.addLocal(ls.slot() - count + 1, ls.typeKind());
+ cob.storeLocal(ls.typeKind(), ls.slot() - count + 1);
+ }
+ case ConstantInstruction ci -> {
+ cob.loadConstant(ci.constantValue());
+ }
+
+ default -> cob.with(coe);
+ }
+ }
+ cob.labelBinding(invalidState);
+ cob.new_(ClassDesc.ofDescriptor(IllegalStateException.class.descriptorString())).dup()
+ .invokespecial(ClassDesc.ofDescriptor(IllegalStateException.class.descriptorString()), ConstantDescs.INIT_NAME, ConstantDescs.MTD_void)
+ .athrow();
+ cob.labelBinding(end);
+
+ localTracker.createLocalStoreFields(clb);
+ }
+
+ private void rebuildGeneratorMethod(ClassModel clm, MethodModel mem, CodeModel com, CodeBuilder cob) {
+ generateGeneratorFromGenMethod(clm, mem, com, cob);
+ }
+ }
+
+// public static Gen meow() {
+// for (int i = 0; i < 2; i++) {
+// System.out.println(i + "asldkjasd");
+// }
+// return null;
+// }
+
+// public Gen gen(double l, int v) {
+// Gen.yield("Yield");
+// return Gen.ret("Ret");
+// }
+//
+// public Gen gen2() {
+// Gen.yield("Yield");
+// return Gen.ret("Ret");
+// }
+
+
+ public static class Mixer implements Gen {
+ public void test() {
+ for (int i = 0; i < 10; i++) {
+ System.out.println(i + "th iteration");
+ }
+
+ while (this.next() instanceof Yield(var yield)) {
+
+ }
+ }
+
+ @Override
+ public Res next() {
+ return new Yield<>("12");
+ }
+ }
+}
diff --git a/src/generator/Gen.java b/src/generator/Gen.java
new file mode 100644
index 0000000..c4ef367
--- /dev/null
+++ b/src/generator/Gen.java
@@ -0,0 +1,28 @@
+package generator;
+
+public interface Gen {
+ Res next();
+
+ static Gen yield(Y y) {
+ throw new RuntimeException();
+ }
+ static Gen yield() {
+ throw new RuntimeException();
+ }
+ static Gen ret(R r) {throw new RuntimeException();}
+ static Gen ret() {
+ throw new RuntimeException();
+ }
+
+ default R await(){
+ while(true){
+ var res = next();
+ if(res instanceof Ret(R r))return r;
+ Gen.yield();
+ }
+ }
+
+ sealed interface Res{}
+ record Yield(Y v) implements Res{}
+ record Ret(R v) implements Res{}
+}
diff --git a/src/generator/Test.java b/src/generator/Test.java
new file mode 100644
index 0000000..6ca95be
--- /dev/null
+++ b/src/generator/Test.java
@@ -0,0 +1,140 @@
+package generator;
+
+import fastexpr.stages.Lexer;
+
+public class Test {
+// public static Gen gen() {
+// Gen.yield("1");
+// Gen.yield("2");
+// Gen.yield("3");
+// Gen.yield("4");
+// return Gen.ret();
+// }
+
+// public static Gentest(T val){
+// Gen.yield(val);
+// return Gen.ret();
+// }
+
+ public static Gentest(double[] nyas){
+ for(var d : nyas){
+ Gen.yield(d);
+ }
+ return Gen.ret();
+ }
+
+ public sealed interface Token{}
+ public enum Punc implements Token {
+ LPar,
+ RPar,
+ Add,
+ Sub,
+ Div,
+ Mul,
+ Equals,
+ Carrot,
+ Comma
+ }
+
+ public record Ident(String ident) implements Token {}
+ public record Numeric(double val) implements Token {}
+
+ public static Gen parse(String input) {
+ int start;
+ int pos = 0;
+ while(true){
+ if (input.length() <= pos)
+ return Gen.ret();
+ start = pos;
+ char curr = input.charAt(pos++);
+
+ switch (curr){
+ case '(' -> Gen.yield(Lexer.Punc.LPar);
+ case ')' -> Gen.yield(Lexer.Punc.RPar);
+ case '+' -> Gen.yield(Lexer.Punc.Add);
+ case '-' -> Gen.yield(Lexer.Punc.Sub);
+ case '/' -> Gen.yield(Lexer.Punc.Div);
+ case '*' -> Gen.yield(Lexer.Punc.Mul);
+ case ',' -> Gen.yield(Lexer.Punc.Comma);
+ case '^' -> Gen.yield(Lexer.Punc.Carrot);
+ case '=' -> Gen.yield(Lexer.Punc.Equals);
+ case char c when Character.isWhitespace(c) -> {}
+ case char c when Character.isAlphabetic(c) -> {
+ while((Character.isLetter(curr) || Character.isLetterOrDigit(curr))){
+ if(pos>=input.length())break;
+ curr = input.charAt(pos++);
+ }
+ Gen.yield(new Lexer.Ident(input.substring(start, pos-1)));
+ }
+ case char c when '0' <= c && c <= '9' -> {
+ boolean exp = false;
+ while(('0' <= curr && curr <= '9') || curr == '_' || curr == '.'){
+ if(pos>=input.length())break;
+ curr = input.charAt(pos++);
+ if(curr=='e'||curr=='E'){
+ if(exp) throw new RuntimeException("Exponent Already included");
+ exp = true;
+ if(pos+2>=input.length())
+ throw new RuntimeException("Expected another character after exponent");
+ curr = input.charAt(++pos); pos++;
+ }
+ }
+
+ Gen.yield(new Lexer.Numeric(Double.parseDouble(input.substring(start, pos-1).replace("_", ""))));
+ }
+ default -> throw new RuntimeException("Invalid char " + curr);
+ }
+ }
+ }
+
+// public static Gen parse(String str){
+// for(var gen = parse(str); gen.next() instanceof Gen.Yield(var item);){
+//
+// }
+// return Gen.ret();
+// }
+
+// public static Gen parse(String str){
+// {
+// String meow = "10";
+// meow += "11";
+// Gen.yield(meow);
+// Gen.yield(meow);
+// Gen.yield(meow);
+// Gen.yield(meow);
+// }
+// for(var split : str.split(" ")){
+// Gen.yield(split);
+// }
+// {
+// var str2 = str;
+// while(str2.length()>10){
+// var len = str2.length();
+// Gen.yield(len+" length");
+// str2 = str2.substring(1);
+// }
+// }
+//
+// while(str.length()>10){
+// var len = str.length();
+// Gen.yield(len+" length");
+// str = str.substring(1);
+// }
+// return Gen.ret();
+// }
+
+// public static Gen gen(int times, double mul) {
+// mul -= 0.5;
+// for (int i = 0; i < times; i ++) {
+// Gen.yield("iteration number: " + i*mul);
+// }
+// return Gen.ret();
+// }
+// public static Gen gen(int times, double mul) {
+// mul -= 0.5;
+// for (int i = 0; i < times; i++) {
+// Gen.yield("iteration number: " + i*mul);
+// }
+// return Gen.ret();
+// }
+}