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const List = @import("list.zig").List;
const mem = @import("mem.zig");
const Allocator = mem.Allocator;
const debug = @import("debug.zig");
const assert = debug.assert;
const strlen = len;
pub fn len(ptr: &const u8) -> usize {
var count: usize = 0;
while (ptr[count] != 0; count += 1) {}
return count;
}
pub fn cmp(a: &const u8, b: &const u8) -> i8 {
var index: usize = 0;
while (a[index] == b[index] && a[index] != 0; index += 1) {}
if (a[index] > b[index]) {
return 1;
} else if (a[index] < b[index]) {
return -1;
} else {
return 0;
};
}
pub fn toSliceConst(str: &const u8) -> []const u8 {
return str[0...strlen(str)];
}
pub fn toSlice(str: &u8) -> []u8 {
return str[0...strlen(str)];
}
/// A buffer that allocates memory and maintains a null byte at the end.
pub const CBuf = struct {
list: List(u8),
/// Must deinitialize with deinit.
pub fn initEmpty(allocator: &Allocator) -> %CBuf {
var self = CBuf {
.list = List(u8).init(allocator),
};
%return self.resize(0);
return self;
}
/// Must deinitialize with deinit.
pub fn initFromMem(allocator: &Allocator, m: []const u8) -> %CBuf {
var self = CBuf {
.list = List(u8).init(allocator),
};
%return self.resize(m.len);
mem.copy(u8, self.list.items, m);
return self;
}
/// Must deinitialize with deinit.
pub fn initFromCStr(allocator: &Allocator, s: &const u8) -> %CBuf {
return CBuf.initFromMem(allocator, s[0...strlen(s)]);
}
/// Must deinitialize with deinit.
pub fn initFromCBuf(cbuf: &const CBuf) -> %CBuf {
return CBuf.initFromMem(cbuf.list.allocator, cbuf.list.items[0...cbuf.len()]);
}
/// Must deinitialize with deinit.
pub fn initFromSlice(other: &const CBuf, start: usize, end: usize) -> %CBuf {
return CBuf.initFromMem(other.list.allocator, other.list.items[start...end]);
}
pub fn deinit(self: &CBuf) {
self.list.deinit();
}
pub fn resize(self: &CBuf, new_len: usize) -> %void {
%return self.list.resize(new_len + 1);
self.list.items[self.len()] = 0;
}
pub fn len(self: &const CBuf) -> usize {
return self.list.len - 1;
}
pub fn appendMem(self: &CBuf, m: []const u8) -> %void {
const old_len = self.len();
%return self.resize(old_len + m.len);
mem.copy(u8, self.list.items[old_len...], m);
}
pub fn appendCStr(self: &CBuf, s: &const u8) -> %void {
self.appendMem(s[0...strlen(s)])
}
pub fn appendChar(self: &CBuf, c: u8) -> %void {
%return self.resize(self.len() + 1);
self.list.items[self.len() - 1] = c;
}
pub fn eqlMem(self: &const CBuf, m: []const u8) -> bool {
if (self.len() != m.len) return false;
return mem.cmp(u8, self.list.items[0...m.len], m) == mem.Cmp.Equal;
}
pub fn eqlCStr(self: &const CBuf, s: &const u8) -> bool {
self.eqlMem(s[0...strlen(s)])
}
pub fn eqlCBuf(self: &const CBuf, other: &const CBuf) -> bool {
self.eqlMem(other.list.items[0...other.len()])
}
pub fn startsWithMem(self: &const CBuf, m: []const u8) -> bool {
if (self.len() < m.len) return false;
return mem.cmp(u8, self.list.items[0...m.len], m) == mem.Cmp.Equal;
}
pub fn startsWithCBuf(self: &const CBuf, other: &const CBuf) -> bool {
self.startsWithMem(other.list.items[0...other.len()])
}
pub fn startsWithCStr(self: &const CBuf, s: &const u8) -> bool {
self.startsWithMem(s[0...strlen(s)])
}
};
fn testSimpleCBuf() {
@setFnTest(this);
var buf = %%CBuf.initEmpty(&debug.global_allocator);
assert(buf.len() == 0);
%%buf.appendCStr(c"hello");
%%buf.appendChar(' ');
%%buf.appendMem("world");
assert(buf.eqlCStr(c"hello world"));
assert(buf.eqlMem("hello world"));
var buf2 = %%CBuf.initFromCBuf(&buf);
assert(buf.eqlCBuf(&buf2));
assert(buf.startsWithMem("hell"));
assert(buf.startsWithCStr(c"hell"));
%%buf2.resize(4);
assert(buf.startsWithCBuf(&buf2));
}
// TODO do this without globals
fn testCompileTimeStrCmp() {
@setFnTest(this);
assert(test_compile_time_str_cmp_result);
}
const test_compile_time_str_cmp_result = (cmp(c"aoeu", c"aoez") == -1);
fn testCompileTimeStrLen() {
@setFnTest(this);
assert(test_comptime_str_len_result);
}
const test_comptime_str_len_result = (len(c"123456789") == 9);
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