Add support for Zig

Adds syntax support for source code for the Zig programming
language. https://ziglang.org/

tests/syntax-tests/highlighted/Zig/example.zig

@@ -0,0 +1,107 @@
+//! this is a top level doc, starts with "//!"
+
+const std = @import("std");
+
+pub fn main() anyerror!void {
+    const stdout = std.io.getStdOut().writer();
+    try stdout.print("Hello, {}!\n", .{"world"});
+}
+
+const expect = std.testing.expect;
+
+test "comments" {
+    // comments start with "//" until newline
+    // foo bar baz
+    const x = true; // another comment
+    expect(x);
+}
+
+/// a doc comment starts with "///"
+/// multiple lines are merged together
+const Timestamp = struct {
+    /// number of seconds since epoch
+    seconds: i64,
+
+    /// number of nanoseconds past the second
+    nano: u32,
+
+    const Self = @This();
+
+    pub fn unixEpoch() Self {
+        return Self{
+            .seconds = 0,
+            .nanos = 0,
+        };
+    }
+};
+
+const my_val = switch (std.Target.current.os.tag) {
+    .linux => "Linux",
+    else => "not Linux",
+};
+
+const Book = enum {
+    paperback,
+    hardcover,
+    ebook,
+    pdf,
+};
+
+const TokenType = union(enum) {
+    int: isize,
+    float: f64,
+    string: []const u8,
+};
+
+const array_lit: [4]u8 = .{ 11, 22, 33, 44 };
+const sentinal_lit = [_:0]u8{ 1, 2, 3, 4 };
+
+test "address of syntax" {
+    // Get the address of a variable:
+    const x: i32 = 1234;
+    const x_ptr = &x;
+
+    // Dereference a pointer:
+    expect(x_ptr.* == 1234);
+
+    // When you get the address of a const variable, you get a const pointer to a single item.
+    expect(@TypeOf(x_ptr) == *const i32);
+
+    // If you want to mutate the value, you'd need an address of a mutable variable:
+    var y: i32 = 5678;
+    const y_ptr = &y;
+    expect(@TypeOf(y_ptr) == *i32);
+    y_ptr.* += 1;
+    expect(y_ptr.* == 5679);
+}
+
+// integer literals
+const decimal_int = 98222;
+const hex_int = 0xff;
+const another_hex_int = 0xFF;
+const octal_int = 0o755;
+const binary_int = 0b11110000;
+
+// underscores may be placed between two digits as a visual separator
+const one_billion = 1_000_000_000;
+const binary_mask = 0b1_1111_1111;
+const permissions = 0o7_5_5;
+const big_address = 0xFF80_0000_0000_0000;
+
+// float literals
+const floating_point = 123.0E+77;
+const another_float = 123.0;
+const yet_another = 123.0e+77;
+
+const hex_floating_point = 0x103.70p-5;
+const another_hex_float = 0x103.70;
+const yet_another_hex_float = 0x103.70P-5;
+
+// underscores may be placed between two digits as a visual separator
+const lightspeed = 299_792_458.000_000;
+const nanosecond = 0.000_000_001;
+const more_hex = 0x1234_5678.9ABC_CDEFp-10;
+
+fn max(comptime T: type, a: T, b: T) T {
+    return if (a > b) a else b;
+}

tests/syntax-tests/source/Zig/example.zig

@@ -0,0 +1,107 @@
+//! this is a top level doc, starts with "//!"
+
+const std = @import("std");
+
+pub fn main() anyerror!void {
+    const stdout = std.io.getStdOut().writer();
+    try stdout.print("Hello, {}!\n", .{"world"});
+}
+
+const expect = std.testing.expect;
+
+test "comments" {
+    // comments start with "//" until newline
+    // foo bar baz
+    const x = true; // another comment
+    expect(x);
+}
+
+/// a doc comment starts with "///"
+/// multiple lines are merged together
+const Timestamp = struct {
+    /// number of seconds since epoch
+    seconds: i64,
+
+    /// number of nanoseconds past the second
+    nano: u32,
+
+    const Self = @This();
+
+    pub fn unixEpoch() Self {
+        return Self{
+            .seconds = 0,
+            .nanos = 0,
+        };
+    }
+};
+
+const my_val = switch (std.Target.current.os.tag) {
+    .linux => "Linux",
+    else => "not Linux",
+};
+
+const Book = enum {
+    paperback,
+    hardcover,
+    ebook,
+    pdf,
+};
+
+const TokenType = union(enum) {
+    int: isize,
+    float: f64,
+    string: []const u8,
+};
+
+const array_lit: [4]u8 = .{ 11, 22, 33, 44 };
+const sentinal_lit = [_:0]u8{ 1, 2, 3, 4 };
+
+test "address of syntax" {
+    // Get the address of a variable:
+    const x: i32 = 1234;
+    const x_ptr = &x;
+
+    // Dereference a pointer:
+    expect(x_ptr.* == 1234);
+
+    // When you get the address of a const variable, you get a const pointer to a single item.
+    expect(@TypeOf(x_ptr) == *const i32);
+
+    // If you want to mutate the value, you'd need an address of a mutable variable:
+    var y: i32 = 5678;
+    const y_ptr = &y;
+    expect(@TypeOf(y_ptr) == *i32);
+    y_ptr.* += 1;
+    expect(y_ptr.* == 5679);
+}
+
+// integer literals
+const decimal_int = 98222;
+const hex_int = 0xff;
+const another_hex_int = 0xFF;
+const octal_int = 0o755;
+const binary_int = 0b11110000;
+
+// underscores may be placed between two digits as a visual separator
+const one_billion = 1_000_000_000;
+const binary_mask = 0b1_1111_1111;
+const permissions = 0o7_5_5;
+const big_address = 0xFF80_0000_0000_0000;
+
+// float literals
+const floating_point = 123.0E+77;
+const another_float = 123.0;
+const yet_another = 123.0e+77;
+
+const hex_floating_point = 0x103.70p-5;
+const another_hex_float = 0x103.70;
+const yet_another_hex_float = 0x103.70P-5;
+
+// underscores may be placed between two digits as a visual separator
+const lightspeed = 299_792_458.000_000;
+const nanosecond = 0.000_000_001;
+const more_hex = 0x1234_5678.9ABC_CDEFp-10;
+
+fn max(comptime T: type, a: T, b: T) T {
+    return if (a > b) a else b;
+}