48 lines
1.7 KiB
Zig
48 lines
1.7 KiB
Zig
const std = @import("std");
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const expectEqualStrings = std.testing.expectEqualStrings;
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pub fn snakeToCamel(allocator: std.mem.Allocator, name: []const u8) ![]u8 {
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var utf8_name = (std.unicode.Utf8View.init(name) catch unreachable).iterator();
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var target_inx: usize = 0;
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var previous_ascii: u8 = 0;
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var rc = try allocator.alloc(u8, name.len);
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while (utf8_name.nextCodepoint()) |cp| {
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if (cp > 0xff) return error.UnicodeNotSupported;
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const ascii_char = @as(u8, @truncate(cp));
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if (ascii_char != '_') {
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if (previous_ascii == '_' and ascii_char >= 'a' and ascii_char <= 'z') {
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const uppercase_char = ascii_char - ('a' - 'A');
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rc[target_inx] = uppercase_char;
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} else {
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rc[target_inx] = ascii_char;
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}
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target_inx = target_inx + 1;
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}
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previous_ascii = ascii_char;
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}
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// Do we care if the allocator refuses resize?
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_ = allocator.resize(rc, target_inx);
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return rc[0..target_inx];
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}
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pub fn snakeToPascal(allocator: std.mem.Allocator, name: []const u8) ![]u8 {
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const rc = try snakeToCamel(allocator, name);
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if (rc[0] >= 'a' and rc[0] <= 'z') {
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const uppercase_char = rc[0] - ('a' - 'A');
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rc[0] = uppercase_char;
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}
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return rc;
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}
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test "converts from snake to camelCase" {
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const allocator = std.testing.allocator;
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const camel = try snakeToCamel(allocator, "access_key_id");
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defer allocator.free(camel);
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try expectEqualStrings("accessKeyId", camel);
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}
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test "single word" {
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const allocator = std.testing.allocator;
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const camel = try snakeToCamel(allocator, "word");
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defer allocator.free(camel);
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try expectEqualStrings("word", camel);
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}
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