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add allocation free versions of lower/upper string

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Co-authored-by: LemonBoy <thatlemon@gmail.com>
Co-authored-by: Andrew Kelley <andrew@ziglang.org>
This commit is contained in:
xackus 2021-03-27 19:32:36 +01:00 committed by Andrew Kelley
parent ccfa168284
commit 143688e266
1 changed files with 36 additions and 10 deletions
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46
lib/std/ascii.zig
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@ -288,36 +288,62 @@ test "ascii character classes" {
try testing.expect(isSpace(' '));
}
/// Writes a lower case copy of `ascii_string` to `output`.
/// Asserts `output.len >= ascii_string.len`.
pub fn lowerString(output: []u8, ascii_string: []const u8) []u8 {
std.debug.assert(output.len >= ascii_string.len);
for (ascii_string) |c, i| {
output[i] = toLower(c);
}
return output[0..ascii_string.len];
}
test "lowerString" {
var buf: [1024]u8 = undefined;
const result = lowerString(&buf, "aBcDeFgHiJkLmNOPqrst0234+💩!");
try std.testing.expectEqualStrings("abcdefghijklmnopqrst0234+💩!", result);
}
/// Allocates a lower case copy of `ascii_string`.
/// Caller owns returned string and must free with `allocator`.
pub fn allocLowerString(allocator: *std.mem.Allocator, ascii_string: []const u8) ![]u8 {
const result = try allocator.alloc(u8, ascii_string.len);
for (result) |*c, i| {
c.* = toLower(ascii_string[i]);
}
return result;
return lowerString(result, ascii_string);
}
test "allocLowerString" {
const result = try allocLowerString(std.testing.allocator, "aBcDeFgHiJkLmNOPqrst0234+💩!");
defer std.testing.allocator.free(result);
try std.testing.expect(std.mem.eql(u8, "abcdefghijklmnopqrst0234+💩!", result));
try std.testing.expectEqualStrings("abcdefghijklmnopqrst0234+💩!", result);
}
/// Writes an upper case copy of `ascii_string` to `output`.
/// Asserts `output.len >= ascii_string.len`.
pub fn upperString(output: []u8, ascii_string: []const u8) []u8 {
std.debug.assert(output.len >= ascii_string.len);
for (ascii_string) |c, i| {
output[i] = toUpper(c);
}
return output[0..ascii_string.len];
}
test "upperString" {
var buf: [1024]u8 = undefined;
const result = upperString(&buf, "aBcDeFgHiJkLmNOPqrst0234+💩!");
try std.testing.expectEqualStrings("ABCDEFGHIJKLMNOPQRST0234+💩!", result);
}
/// Allocates an upper case copy of `ascii_string`.
/// Caller owns returned string and must free with `allocator`.
pub fn allocUpperString(allocator: *std.mem.Allocator, ascii_string: []const u8) ![]u8 {
const result = try allocator.alloc(u8, ascii_string.len);
for (result) |*c, i| {
c.* = toUpper(ascii_string[i]);
}
return result;
return upperString(result, ascii_string);
}
test "allocUpperString" {
const result = try allocUpperString(std.testing.allocator, "aBcDeFgHiJkLmNOPqrst0234+💩!");
defer std.testing.allocator.free(result);
try std.testing.expect(std.mem.eql(u8, "ABCDEFGHIJKLMNOPQRST0234+💩!", result));
try std.testing.expectEqualStrings("ABCDEFGHIJKLMNOPQRST0234+💩!", result);
}
/// Compares strings `a` and `b` case insensitively and returns whether they are equal.