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Non-functional, but apparently complete small str initialization for Zig RocStr

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This commit is contained in:
Chad Stearns 2020-11-15 03:48:36 -05:00
parent d93e63bbd0
commit 4ac5d5ffd5
1 changed files with 41 additions and 4 deletions
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45
compiler/builtins/bitcode/src/str.zig
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@ -4,17 +4,53 @@ const testing = std.testing;
const expectEqual = testing.expectEqual;
const expect = testing.expect;
const RocStr = struct {
str_bytes_ptrs: [*]u8,
str_len: usize,
pub fn init(bytes: [*]u8, len: usize) RocStr {
pub fn get_small_str_ptr(self: *RocStr) *u8 {
const small_str_ptr = @ptrCast(*u8, self);
return small_str_ptr;
}
pub fn empty() RocStr {
return RocStr {
.str_bytes_ptrs = bytes,
.str_len = len
.str_len = 0,
.str_bytes_ptrs = undefined
};
}
pub fn init(bytes: [*]u8, len: usize) RocStr {
const rocStrSize = @sizeOf(RocStr);
if (len < rocStrSize) {
var empty_roc_str = RocStr.empty();
const target_ptr = @ptrToInt(empty_roc_str.get_small_str_ptr());
var index : u8 = 0;
while (index < len) {
var offset_ptr = @intToPtr(*usize, target_ptr + index);
offset_ptr.* = bytes[index];
index += 1;
}
const final_byte_ptr = @intToPtr(*usize, target_ptr + index);
final_byte_ptr.* = rocStrSize ^ 0b10000000;
empty_roc_str.str_len = target_ptr;
return empty_roc_str;
} else {
return RocStr {
.str_bytes_ptrs = bytes,
.str_len = len
};
}
}
pub fn eq(self: *RocStr, other: RocStr) bool {
if (self.str_len != other.str_len) {
return false;
@ -111,7 +147,8 @@ pub fn strSplitInPlace(
}
if (matches_delimiter) {
array[ret_array_index] = RocStr.init(str_bytes_ptrs + sliceStart_index, str_index - sliceStart_index);
const segment_len : usize = str_index - sliceStart_index;
array[ret_array_index] = RocStr.init(str_bytes_ptrs + sliceStart_index, segment_len);
sliceStart_index = str_index + delimiter_len;
ret_array_index += 1;
str_index += delimiter_len;