Revision of fpc.zig

yumaikas revidoval tento gist 15 hours ago. Přejít na revizi

1 file changed, 85 insertions

fpc.zig(vytvořil soubor)

		@@ -0,0 +1,85 @@
1	+	const std = @import("std");
2	+
3	+	pub fn main() !void {
4	+	var gpa = std.heap.GeneralPurposeAllocator(.{}).init;
5	+	defer _ = gpa.deinit();
6	+	const alloc = gpa.allocator();
7	+
8	+	// Using this for cross-platform suitability
9	+	const argv = try std.process.argsAlloc(alloc);
10	+	defer std.process.argsFree(alloc, argv);
11	+
12	+	try stkEval(alloc, argv[1..]);
13	+	}
14	+
15	+	const eql = std.mem.eql;
16	+	const parseFloat = std.fmt.parseFloat;
17	+
18	+	const StkEvalError = error{
19	+	StackUnderflow,
20	+	UnrecognizedOperation,
21	+	};
22	+
23	+	fn Stack(comptime T: type) type {
24	+	return struct {
25	+	const Self = @This();
26	+
27	+	storage: std.ArrayList(T),
28	+	alloc: std.mem.Allocator,
29	+	pub fn init(alloc: std.mem.Allocator) !Self {
30	+	const list = try std.ArrayList(T).initCapacity(alloc, 8);
31	+	return Self{
32	+	.storage = list,
33	+	.alloc = alloc,
34	+	};
35	+	}
36	+	pub fn items(self: Self) []T {
37	+	return self.storage.items;
38	+	}
39	+	pub fn deinit(self: *Self) void {
40	+	self.storage.deinit(self.alloc);
41	+	}
42	+	pub fn pop(self: *Self) StkEvalError!T {
43	+	return self.storage.pop() orelse StkEvalError.StackUnderflow;
44	+	}
45	+	pub fn push(self: *Self, item: T) !void {
46	+	try self.storage.append(self.alloc, item);
47	+	}
48	+	};
49	+	}
50	+
51	+
52	+	pub fn stkEval(alloc: std.mem.Allocator, tokens: [][:0]u8) !void {
53	+	var dataStack = try Stack(f64).init(alloc);
54	+	defer dataStack.deinit();
55	+
56	+	for (tokens) \|token\| {
57	+	if (parseFloat(f64, token) catch null) \|num\| {
58	+	try dataStack.push(num);
59	+	} else if (eql(u8, token, "+")) {
60	+	const a = try dataStack.pop();
61	+	const b = try dataStack.pop();
62	+	try dataStack.push(a+b);
63	+	} else if (eql(u8, token, "-")) {
64	+	const a = try dataStack.pop();
65	+	const b = try dataStack.pop();
66	+	try dataStack.push(b-a);
67	+	} else if (eql(u8, token, "x")) {
68	+	const a = try dataStack.pop();
69	+	const b = try dataStack.pop();
70	+	try dataStack.push(a*b);
71	+	} else if (eql(u8, token, "div")) {
72	+	const a = try dataStack.pop();
73	+	const b = try dataStack.pop();
74	+	try dataStack.push(b/a);
75	+	} else {
76	+	std.debug.print("UNHANDLED {s}\n", .{token});
77	+	return StkEvalError.UnrecognizedOperation;
78	+	}
79	+	}
80	+
81	+	for (dataStack.items()) \|item\| {
82	+	std.debug.print("{} ", .{item});
83	+	}
84	+	std.debug.print("\n", .{});
85	+	}

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