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import std.stdio;
import std.string;
import std.conv;
import parser;
import dbg;
enum ObjType {
FUNCTION,
SCRIPT,
}
abstract class Obj {
ObjType type;
}
class Function : Obj {
Chunk chunk;
int arity;
string name;
ObjType type;
this(ObjType type, string name = "") {
this.type = type;
this.chunk = new Chunk();
this.arity = 0;
this.name = name;
}
override string toString() {
if (type == ObjType.SCRIPT) {
return "<neb>";
} else {
return format("<fn %s>", name);
}
}
}
enum SeqType {
LIST,
STRING,
}
abstract class Seq {
SeqType type;
abstract Value first();
abstract Seq rest();
abstract int length();
abstract bool isIn(Value val);
}
class String : Seq {
string str;
this(Value value) {
this.str = value.as.str;
this.type = SeqType.STRING;
}
this(string str) {
this.str = str;
this.type = SeqType.STRING;
}
override Value first() {
return makeStringValue(to!string(this.str[0]));
}
override Seq rest() {
return new String(this.str[1..$]);
}
override int length() {
return to!int(str.length);
}
Seq concat(Seq seq) {
if (seq.type != SeqType.STRING) {
// how do i throw an error here?
writeln("must concat strings to strings!");
return this;
}
String strSeq = cast(String)seq;
return new String(this.str ~ strSeq.str);
}
override bool isIn(Value val) {
if (val.type != ValueType.SEQ) {
// how do i throw an error here?
writeln("a non-string can't be 'in?' a string (this should be a compile error)");
return false;
}
Seq seq = val.as.seq;
if (seq.type != SeqType.STRING) {
// how do i throw an error here?
writeln("a non-string can't be 'in?' a string (this should be a compile error)");
return false;
}
String strVal = cast(String)seq;
return (indexOf(this.str, strVal.str) != -1);
}
override string toString() {
return format("\"%s\"", this.str);
}
}
class List : Seq {
Value[] inner;
this(int length) {
this.inner = new Value[length];
this.type = SeqType.LIST;
}
void addItemAtIndex(Value item, int idx) {
this.inner[idx] = item;
}
override Value first() {
return this.inner[0]; // this fails on NIL
}
override Seq rest() {
if (this.inner.length == 0) {
return new List(0);
}
List ret = new List(to!int(this.inner.length) - 1);
for (int i = 1; i < this.inner.length; i++) {
ret.addItemAtIndex(this.inner[i], i - 1);
}
return ret;
}
override int length() {
return to!int(this.inner.length);
}
Seq append(Value val) {
int length = to!int(this.inner.length);
List ret = new List(length + 1);
for (int i = 0; i < length; i++) {
ret.addItemAtIndex(this.inner[i], i);
}
ret.addItemAtIndex(val, length);
return ret;
}
override bool isIn(Value val) {
foreach(Value mine ; this.inner) {
if (areValuesEqual(mine, val)) {
return true;
}
}
return false;
}
override string toString() {
if (this.inner.length == 0) {
return "nil";
} else {
return format("list ('%s' + %d)", printableValue(this.inner[0]), this.inner.length - 1);
}
}
}
enum OpCode {
// MATH
OP_ADD,
OP_DIVIDE,
OP_INCREMENT,
OP_MULTIPLY,
OP_NEGATE,
OP_SUBTRACT,
OP_ZERO,
// BOOLEAN
OP_EQUAL,
OP_GREATER,
OP_LESS,
OP_NOT,
// LISTS
OP_LIST,
OP_LIST_N,
// SEQUENCES
OP_CONCAT, // No?
OP_APPEND,
OP_FIRST, // No?
OP_LENGTH,
OP_MEMBER,
OP_REST,
// DEFINITIONS/VARIABLES
OP_CONSTANT,
OP_DEF_GLOBAL,
OP_DEF_LOCAL,
OP_GET_GLOBAL,
OP_GET_LOCAL,
OP_SET_GLOBAL,
OP_SET_LOCAL,
// JUMPS
OP_JUMP,
OP_JUMP_IF_FALSE,
OP_JUMP_IF_TRUE,
OP_JUMP_TO,
// STACK THINGS
OP_DUPLICATE,
OP_DUPLICATE_2,
OP_POP,
OP_POPB,
OP_POP_SCOPE,
OP_ROTATE_N,
// RANDOM
OP_NIL,
// FUNCTIONS
OP_CALL,
OP_RETURN,
// TYPES
OP_IS_NIL,
OP_TYPE_CHECK_BOOLEAN,
OP_TYPE_CHECK_LIST,
OP_TYPE_CHECK_NUMBER,
OP_TYPE_CHECK_SEQ,
OP_TYPE_CHECK_STRING,
}
class Chunk {
int count = 0;
ubyte[] code;
int[] lines;
Value[] constants;
int writeOp(ubyte opCode, int line) {
this.code ~= opCode;
this.lines ~= line;
this.count++;
assert(this.code.length == count);
assert(this.lines.length == count);
return count;
}
int addConstant(Value value) {
this.constants ~= value;
return to!int(this.constants.length - 1);
}
}
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