116 lines
3.2 KiB
Zig
116 lines
3.2 KiB
Zig
const std = @import("std");
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pub const ParseError = error{
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NoCommandGiven,
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UnknownCommand,
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ArgRequired,
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};
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pub const CommandType = enum {
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Noop,
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Load,
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Amp,
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RFlanger,
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Quicksave,
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};
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pub const Command = struct {
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command: CommandType,
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args: ArgList,
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pub fn print(self: *const Command) void {
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std.debug.warn("cmd:{}\n", self.command);
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}
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pub fn argAt(self: *const Command, idx: usize) ![]const u8 {
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const args = self.args.toSliceConst();
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if (idx > (args.len - 1)) {
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std.debug.warn("Expected argument at index {}\n", idx);
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return ParseError.ArgRequired;
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}
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return args[idx];
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}
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pub fn usizeArgAt(self: *const Command, idx: usize) !usize {
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var arg = try self.argAt(idx);
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return try std.fmt.parseInt(usize, arg, 10);
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}
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pub fn intArgAt(self: *const Command, idx: usize) !i32 {
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var arg = try self.argAt(idx);
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return try std.fmt.parseInt(i32, arg, 10);
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}
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pub fn floatArgAt(self: *const Command, idx: usize) !f32 {
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var arg = try self.argAt(idx);
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return try std.fmt.parseFloat(f32, arg);
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}
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};
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pub const CommandList = std.ArrayList(*Command);
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pub const ArgList = std.ArrayList([]const u8);
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pub fn commandToCmdType(command: []const u8) ParseError!CommandType {
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// TODO make a hashmap for those
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if (std.mem.eql(u8, command, "noop")) {
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return CommandType.Noop;
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} else if (std.mem.eql(u8, command, "load")) {
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return CommandType.Load;
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} else if (std.mem.eql(u8, command, "amp")) {
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return CommandType.Amp;
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} else if (std.mem.eql(u8, command, "rflanger")) {
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return CommandType.RFlanger;
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} else if (std.mem.eql(u8, command, "quicksave")) {
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return CommandType.Quicksave;
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} else {
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std.debug.warn("Unknown command: '{}'\n", command);
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return ParseError.UnknownCommand;
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}
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}
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pub const Lang = struct {
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allocator: *std.mem.Allocator,
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pub fn init(allocator: *std.mem.Allocator) Lang {
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return Lang{ .allocator = allocator };
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}
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pub fn parse(self: *Lang, data: []const u8) !CommandList {
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var splitted_it = std.mem.separate(data, ";");
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var cmds = CommandList.init(self.allocator);
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while (splitted_it.next()) |stmt_orig| {
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var stmt = std.mem.trimRight(u8, stmt_orig, "\n");
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stmt = std.mem.trimLeft(u8, stmt, "\n");
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if (stmt.len == 0) continue;
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if (stmt[0] == '#') continue;
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// TODO better tokenizer instead of just tokenize(" ");
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var tok_it = std.mem.tokenize(stmt, " ");
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var cmd_opt = tok_it.next();
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if (cmd_opt == null) return ParseError.NoCommandGiven;
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var command = cmd_opt.?;
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var ctype = try commandToCmdType(command);
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var args = ArgList.init(self.allocator);
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while (tok_it.next()) |arg| {
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try args.append(arg);
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}
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// construct final Command based on command
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var cmd_ptr = try self.allocator.create(Command);
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cmd_ptr.* = Command{ .command = ctype, .args = args };
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try cmds.append(cmd_ptr);
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}
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return cmds;
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}
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};
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// TODO tests
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