From be280d44f3d6070506c442be78b16e8c5edb2900 Mon Sep 17 00:00:00 2001
From: Luna <git@l4.pm>
Date: Mon, 8 Jul 2019 00:09:34 -0300
Subject: [PATCH] basic parser

---
 src/lang.zig | 46 ++++++++++++++++++++++++++++++++++++++++------
 src/main.zig |  2 +-
 2 files changed, 41 insertions(+), 7 deletions(-)

diff --git a/src/lang.zig b/src/lang.zig
index bc22627..b76e337 100644
--- a/src/lang.zig
+++ b/src/lang.zig
@@ -5,18 +5,36 @@ pub const CommandType = enum {
     Load,
     Amp,
     Quicksave,
+
+    // TODO proper errs
+    Error,
 };
 
 pub const Command = struct {
     command: CommandType,
-    args: []const u8,
+    args: ArgList,
 
     pub fn print(self: *const Command) void {
-        std.debug.warn("cmd:{} args:{}\n", self.command, self.args);
+        std.debug.warn("cmd:{}\n", self.command);
     }
 };
 
-pub const CommandList = std.ArrayList(Command);
+pub const CommandList = std.ArrayList(*Command);
+pub const ArgList = std.ArrayList([]const u8);
+
+pub fn commandToCmdType(command: []const u8) CommandType {
+    if (std.mem.eql(u8, command, "noop")) {
+        return .Noop;
+    } else if (std.mem.eql(u8, command, "load")) {
+        return .Load;
+    } else if (std.mem.eql(u8, command, "amp")) {
+        return .Amp;
+    } else if (std.mem.eql(u8, command, "quicksave")) {
+        return .Quicksave;
+    } else {
+        return .Error;
+    }
+}
 
 pub const Lang = struct {
     allocator: *std.mem.Allocator,
@@ -25,7 +43,7 @@ pub const Lang = struct {
         return Lang{ .allocator = allocator };
     }
 
-    pub fn parse(self: *Lang, data: []const u8) CommandList {
+    pub fn parse(self: *Lang, data: []const u8) !CommandList {
         var splitted_it = std.mem.separate(data, ";");
         var cmds = CommandList.init(self.allocator);
 
@@ -34,10 +52,26 @@ pub const Lang = struct {
 
             if (stmt.len == 0) continue;
 
-            // TODO parse stmt
-            std.debug.warn("full cmd: '{}'\n", stmt);
+            // TODO better tokenizer instead of just tokenize(" ");
+            var tok_it = std.mem.tokenize(stmt, " ");
+
+            // TODO send errors
+            var command = tok_it.next().?;
+            var ctype = commandToCmdType(command);
+            var args = ArgList.init(self.allocator);
+
+            while (tok_it.next()) |arg| {
+                try args.append(arg);
+            }
+
+            // construct final Command based on command
+            var cmd_ptr = try self.allocator.create(Command);
+            cmd_ptr.* = Command{ .command = ctype, .args = args };
+            try cmds.append(cmd_ptr);
         }
 
         return cmds;
     }
 };
+
+// TODO tests
diff --git a/src/main.zig b/src/main.zig
index 262e475..f75c1ef 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -323,7 +323,7 @@ pub fn main() !void {
     var data = try allocator.alloc(u8, total_bytes);
     _ = try file.read(data);
 
-    var cmds = lang.parse(data);
+    var cmds = try lang.parse(data);
     var it = cmds.iterator();
     while (it.next()) |cmd| {
         cmd.print();