1 files changed, 93 insertions, 0 deletions
diff --git a/_tests/switchtable.zig b/_tests/switchtable.zig
new file mode 100644
index 0000000..722ecdd
--- /dev/null
+++ b/_tests/switchtable.zig
@@ -0,0 +1,93 @@
+const std = @import("std");
+
+const Reader = std.io.AnyReader;
+
+pub fn main() !u8 {
+    return f();
+}
+
+fn f() !u8 {
+    const file = try std.fs.cwd().openFile("string", .{});
+    defer file.close();
+
+    var br = std.io.bufferedReader(file.reader());
+    const r = br.reader().any();
+
+    var n: u8 = 0;
+    for (0..1_000_000) |i| {
+        _ = i;
+        while (r.readByte() catch null) |c| {
+            n +%= try f1(r, c);
+        }
+        br.start = 0;
+        br.end = 0;
+        try file.seekTo(0);
+    }
+    return n;
+}
+
+fn f1(r: Reader, c1: u8) !u8 {
+    if (c1 != '\\') return c1;
+    const c = try r.readByte();
+    if (c == 'u') return unknown1();
+    return switch (c) {
+        '\\', '"' => c,
+        '0' => 0,
+        'a' => 7,
+        'b' => 8,
+        't' => 9,
+        'n' => 10,
+        'v' => 11,
+        'f' => 12,
+        'r' => 13,
+        'e' => 27,
+        'x' => unknown2(),
+        else => unknown3(),
+    };
+}
+
+fn f2(r: Reader, c1: u8) !u8 {
+    if (c1 != '\\') return c1;
+    const c = try r.readByte();
+    if (c == 'u') return unknown1();
+    if (c == 'x') return unknown2();
+    if (c == '\\' or c == '"') return c;
+    const itable = .{ '0', 'a', 'b', 't', 'n', 'v', 'f', 'r', 'e' };
+    const ctable: []const u8 = &.{ 0, 7, 8, 9, 10, 11, 12, 13, 27 };
+    const i = std.mem.indexOfScalar(u8, &itable, c) orelse return unknown3();
+    return ctable[i];
+}
+
+fn f3(r: Reader, c1: u8) !u8 {
+    if (c1 != '\\') return c1;
+    const c = try r.readByte();
+    if (c == 'u') return unknown1();
+    if (c == 'x') return unknown2();
+    if (c == '\\' or c == '"') return c;
+    if (c == '0') return 0;
+    const table = comptime t: {
+        var table: [26]u8 = .{0} ** 26;
+        table['a' - 'a'] = 7;
+        table['b' - 'a'] = 8;
+        table['t' - 'a'] = 9;
+        table['n' - 'a'] = 10;
+        table['v' - 'a'] = 11;
+        table['f' - 'a'] = 12;
+        table['r' - 'a'] = 13;
+        table['e' - 'a'] = 27;
+        break :t table;
+    };
+    if (c < 'a') return unknown3();
+    const result = table[c - 'a'];
+    return if (result != 0) result else unknown3();
+}
+
+fn unknown1() u8 {
+    return 0;
+}
+fn unknown2() u8 {
+    return 0;
+}
+fn unknown3() u8 {
+    return 0;
+}