string iterator into new file

Author: ColinEberhardt

assembly/parser/parser.ts

@@ -1,4 +1,5 @@
 import { isDigit, Char } from "../char";
+import { StringIterator } from "./string-iterator";
 import {
   AST,
   RangeRepetitionNode,
@@ -58,46 +59,7 @@ class Range {
   to: i32 = -1;
 }
 
-class StringIterator {
-  current: u32;
-  cursor: u32 = 0;
-
-  constructor(private sourceString: string) {
-    this.current = this.sourceString.charCodeAt(0);
-  }
-
-  lookahead(distance: u32): u32 {
-    return this.sourceString.charCodeAt(this.cursor + distance);
-  }
-
-  next(): bool {
-    this.cursor++;
-    if (this.cursor >= u32(this.sourceString.length)) {
-      return false;
-    }
-    this.current = this.sourceString.charCodeAt(this.cursor);
-    return true;
-  }
-
-  currentAsString(): string {
-    return String.fromCharCode(this.current);
-  }
-
-  more(): bool {
-    return this.cursor < u32(this.sourceString.length);
-  }
-
-  copy(): StringIterator {
-    const iterator = new StringIterator(this.sourceString);
-    iterator.cursor = this.cursor;
-    iterator.current = this.current;
-    return iterator;
-  }
-}
-
 export class Parser {
-  // currentToken: string = "";
-  // cursor: u32 = 0;
   iterator: StringIterator;
 
   private constructor(input: string) {