From e8366e0230cd47fc533b24fe8c21454f76524294 Mon Sep 17 00:00:00 2001
From: Mikkel Kongsted <mtkongsted@gmail.com>
Date: Fri, 1 Nov 2024 12:21:40 +0100
Subject: [PATCH] some lexer stuff

---
 .vscode/settings.json |  3 +++
 README.md             |  2 +-
 deno.jsonc            |  5 +++++
 src/Lexer.ts          | 40 ++++++++++++++++++++++++++++++++++++++++
 src/Token.ts          | 14 ++++++++++++++
 5 files changed, 63 insertions(+), 1 deletion(-)
 create mode 100644 .vscode/settings.json
 create mode 100644 deno.jsonc
 create mode 100644 src/Lexer.ts
 create mode 100644 src/Token.ts

diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..f7f606b
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,3 @@
+{
+    "deno.enable": true
+}
diff --git a/README.md b/README.md
index ff95c79..f9f9a1b 100644
--- a/README.md
+++ b/README.md
@@ -1 +1 @@
-# Slige
\ No newline at end of file
+# Slige
diff --git a/deno.jsonc b/deno.jsonc
new file mode 100644
index 0000000..3fecf5f
--- /dev/null
+++ b/deno.jsonc
@@ -0,0 +1,5 @@
+{
+    "fmt": {
+        "indentWidth": 4
+    }
+}
diff --git a/src/Lexer.ts b/src/Lexer.ts
new file mode 100644
index 0000000..e69e070
--- /dev/null
+++ b/src/Lexer.ts
@@ -0,0 +1,40 @@
+import { Pos, Token } from "./Token.ts";
+
+class Lexer {
+    private index = 0;
+    private line = 1;
+    private col = 1;
+
+
+    public constructor (private text: string) {}
+
+    public next(): Token | null { return null }
+    
+    private done(): boolean { return this.index >= this.text.length; }
+    private current(): string { return this.text[this.index]; }
+
+    private step() {
+        if (this.done())
+            return;
+        if (this.current() === "\n") {
+            this.line += 1;
+            this.col = 1;
+        } else {
+            this.col += 1;
+        }
+        this.index += 1;
+    }
+
+    private pos(): Pos {
+        return {
+            index: this.index,
+            line: this.line,
+            col: this.col
+        }
+    }
+
+    private token(type: string, pos: Pos): Token {
+        const length = this.index - pos.index;
+        return { type, pos, length };
+    }
+}
diff --git a/src/Token.ts b/src/Token.ts
new file mode 100644
index 0000000..6cbc56e
--- /dev/null
+++ b/src/Token.ts
@@ -0,0 +1,14 @@
+export type Token = {
+    type: string;
+    pos: Pos;
+    length: number;
+    identValue?: string;
+    intValue?: number;
+    stringValue?: string;
+};
+
+export type Pos = {
+    index: number;
+    line: number;
+    col: number;
+};