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const builtin = @import("builtin");
const std = @import("std");
const expect = std.testing.expect;
const expectEqual = std.testing.expectEqual;
test "if statements" {
shouldBeEqual(1, 1);
firstEqlThird(2, 1, 2);
}
fn shouldBeEqual(a: i32, b: i32) void {
if (a != b) {
unreachable;
} else {
return;
}
}
fn firstEqlThird(a: i32, b: i32, c: i32) void {
if (a == b) {
unreachable;
} else if (b == c) {
unreachable;
} else if (a == c) {
return;
} else {
unreachable;
}
}
test "else if expression" {
try expect(elseIfExpressionF(1) == 1);
}
fn elseIfExpressionF(c: u8) u8 {
if (c == 0) {
return 0;
} else if (c == 1) {
return 1;
} else {
return @as(u8, 2);
}
}
// #2297
var global_with_val: anyerror!u32 = 0;
var global_with_err: anyerror!u32 = error.SomeError;
test "unwrap mutable global var" {
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
if (global_with_val) |v| {
try expect(v == 0);
} else |_| {
unreachable;
}
if (global_with_err) |_| {
unreachable;
} else |e| {
try expect(e == error.SomeError);
}
}
test "labeled break inside comptime if inside runtime if" {
var answer: i32 = 0;
var c = true;
_ = &c;
if (c) {
answer = if (true) blk: {
break :blk @as(i32, 42);
};
}
try expect(answer == 42);
}
test "const result loc, runtime if cond, else unreachable" {
const Num = enum { One, Two };
var t = true;
_ = &t;
const x = if (t) Num.Two else unreachable;
try expect(x == .Two);
}
test "if copies its payload" {
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
const S = struct {
fn doTheTest() !void {
var tmp: ?i32 = 10;
if (tmp) |value| {
// Modify the original variable
tmp = null;
try expect(value == 10);
} else unreachable;
}
};
try S.doTheTest();
try comptime S.doTheTest();
}
test "if prongs cast to expected type instead of peer type resolution" {
const S = struct {
fn doTheTest(f: bool) !void {
var x: i32 = 0;
x = if (f) 1 else 2;
try expect(x == 2);
var b = true;
_ = &b;
const y: i32 = if (b) 1 else 2;
try expect(y == 1);
}
};
try S.doTheTest(false);
try comptime S.doTheTest(false);
}
test "if peer expressions inferred optional type" {
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
var self: []const u8 = "abcdef";
var index: usize = 0;
_ = .{ &self, &index };
const left_index = (index << 1) + 1;
const right_index = left_index + 1;
const left = if (left_index < self.len) self[left_index] else null;
const right = if (right_index < self.len) self[right_index] else null;
try expect(left_index < self.len);
try expect(right_index < self.len);
try expect(left.? == 98);
try expect(right.? == 99);
}
test "if-else expression with runtime condition result location is inferred optional" {
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
const A = struct { b: u64, c: u64 };
var d: bool = true;
_ = &d;
const e = if (d) A{ .b = 15, .c = 30 } else null;
try expect(e != null);
}
test "result location with inferred type ends up being pointer to comptime_int" {
var a: ?u32 = 1234;
var b: u32 = 2000;
_ = .{ &a, &b };
const c = if (a) |d| blk: {
if (d < b) break :blk @as(u32, 1);
break :blk 0;
} else @as(u32, 0);
try expect(c == 1);
}
test "if-@as-if chain" {
var fast = true;
var very_fast = false;
_ = .{ &fast, &very_fast };
const num_frames = if (fast)
@as(u32, if (very_fast) 16 else 4)
else
1;
try expect(num_frames == 4);
}
fn returnTrue() bool {
return true;
}
test "if value shouldn't be load-elided if used later (structs)" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
const Foo = struct { x: i32 };
var a = Foo{ .x = 1 };
var b = Foo{ .x = 1 };
const c = if (@call(.never_inline, returnTrue, .{})) a else b;
// The second variable is superfluous with the current
// state of codegen optimizations, but in future
// "if (smthg) a else a" may be optimized simply into "a".
a.x = 2;
b.x = 3;
try std.testing.expectEqual(c.x, 1);
}
test "if value shouldn't be load-elided if used later (optionals)" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
var a: ?i32 = 1;
var b: ?i32 = 1;
const c = if (@call(.never_inline, returnTrue, .{})) a else b;
a = 2;
b = 3;
try std.testing.expectEqual(c, 1);
}
test "variable type inferred from if expression" {
var a = if (true) {
return;
} else true;
_ = &a;
return error.TestFailed;
}
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