Update fn to function (#13)

Author: mohitk05

README.md

@@ -1,13 +1,13 @@
 # The Gom Programming Language
 
-**Gom** is a statically typed, multi-paradigm programming language based on a subset of the ECMAScript (and Rust) syntax but providing type-safety and concise syntax. It can be interpreted or compiled to C code or LLVM IR. It takes inspiration from AssemblyScript and makes it more approachable to learn compiler construction.
+**Gom** is a statically typed, compiled programming language based on a subset of TypeScript's syntax. Imagine writing TypeScript, but instead of compiling to JavaScript, it compiles to LLVM IR which can then be compiled directly to machine code.
 
 Here’s a typical hello world program in Gom:
 
 ```ts
 import io;
 
-fn main() {
+function main() {
 	io.log("Hello, world!");
 }
 ```
@@ -19,29 +19,31 @@ Simple arithmetic and function declaration looks like this:
 ```ts
 import io;
 
-fn add(a: int, b: int): int {
+function add(a: int, b: int): int {
 	return a + b;
 }
 
-fn main() {
+function main() {
 	io.log("Sum:", add(1, 2)); // Prints "Sum: 3"
 }
 ```
 
-Defining complex data structures is possible via the `struct` notation (like `struct` in C/Rust/Go). `let` is the variable declaration keyword, it infers type from the expression on the right hand side of `=`.
+Defining complex data structures is possible via the `type` keyword. `let` is the variable declaration keyword, it infers type from the expression on the right hand side of `=`.
 
 ```ts
 import io;
 
+// List
 type Numbers = [int];
 
+// Struct
 type Temperature = {
 	high: int,
 	low: int,
 	avg: int
 };
 
-fn main() {
+function main() {
 	let a = 1; // type inferred as int
 	io.log("a: ", a);
 
@@ -60,7 +62,7 @@ fn main() {
 }
 ```
 
-Apart from the built-in types, custom types can be created using the `type` keyword.
+Other types can be defined using the `type` keyword.
 
 ```ts
 type Count = int;

examples/hello_world.gom

@@ -1,5 +1,5 @@
 import io;
 
-fn main() {
+function main() {
     io.log("Hello, World!");
 }

examples/list.gom

@@ -8,7 +8,7 @@ type Status = {
 type StatusList = [Status];
 type Pairs = [{ int, int }];
 
-fn main() {
+function main() {
   let numbers = Numbers { 1, 2, 3, 4, 5 };
 
   let i = 0;

examples/loop.gom

@@ -1,6 +1,6 @@
 import io;
 
-fn main() {
+function main() {
     let i = 0;
     for (i = 0; i < 10; i = i + 1) {
         io.log("i: ", i);

examples/methods.gom

@@ -0,0 +1,16 @@
+import io;
+
+type Status = {
+  code: int,
+  success: bool,
+
+  function print() {
+    io.log("Status { code: ", code, ", success: ", success, " }");
+  }
+};
+
+function main() {
+  let status = Status { code: 200, success: true };
+  io.log("Printing status:");
+  status.print();
+}

examples/readme.gom

@@ -8,7 +8,7 @@ type Temperature = {
 	avg: int
 };
 
-fn main() {
+function main() {
 	let a = 1; // type inferred as int
 	io.log("a: ", a);
 

examples/recursion.gom

@@ -1,13 +1,13 @@
 import io;
 
-fn power_n(x: int, n: int): int {
+function power_n(x: int, n: int): int {
     if (n == 0) {
         return 1;
     }
     return x * power_n(x, n - 1);
 }
 
-fn main() {
+function main() {
     io.log("Hello, World!");
     io.log("2^3 = ", power_n(2, 3));
 }

examples/test_2.gom

@@ -13,19 +13,19 @@ type Line = {
 
 let GLOBAL = 1;
 
-fn square(x: int): int {
+function square(x: int): int {
     return x * x;
 }
 
-fn add(a: int, b: int): int {
+function add(a: int, b: int): int {
     return a + b;
 }
 
-fn distance(p1: Point, p2: Point): int {
+function distance(p1: Point, p2: Point): int {
     return square(p1.x - p2.x) + square(p1.y - p2.y);
 }
 
-fn main() {
+function main() {
     let p1 = Point { x: 1, y: 2 }, p2 = Point { x: 3, y: 4 };
     let d = distance(p1, p2);
     io.log("Distance between p1 and p2: ", d);

examples/test_3.gom

@@ -4,15 +4,15 @@ import io;
 type HttpResponse = { int, bool };
 
 
-fn process_http(url: str): HttpResponse {
+function process_http(url: str): HttpResponse {
   if(url == "http://www.example.com") {
     return { 200, true };
   }
 
   return { 401, false };
 }
 
-fn process_http_retry(url: str, retries: int): HttpResponse {
+function process_http_retry(url: str, retries: int): HttpResponse {
   let i = 0;
   for(i = retries; i > 0; i = i - 1) {
     io.log("Round: ", retries - i + 1);
@@ -25,7 +25,7 @@ fn process_http_retry(url: str, retries: int): HttpResponse {
   return { 500, false };
 }
 
-fn main() {
+function main() {
   let resp = process_http_retry("http://www.example.com", 10);
   io.log("Status: ", resp.0, " Success: ", resp.1);
 }

gom.ebnf

@@ -6,10 +6,10 @@ typeOrFunctionDefinition = typeDefinition | functionDefinition;
 
 typeDefinition = "type" , identifier , "=" , gomType , ";";
 
-functionDefinition = "fn" , identifier , "(" , argumentItem* , ")" , functionReturnType? ,
+functionDefinition = "function" , identifier , "(" , argumentItem* , ")" , functionReturnType? ,
 	"{" , statement+ , "}";
 
-mainFunction = "fn" , "main" , "(" , argumentItem* , ")" , functionReturnType? , 
+mainFunction = "function" , "main" , "(" , argumentItem* , ")" , functionReturnType? , 
 	"{" , statement+ , "}";
 
 statement = ifStatement