118 lines
3.4 KiB
Zig
118 lines
3.4 KiB
Zig
const debug = @import("debug.zig");
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const mem = @import("mem.zig");
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const Allocator = mem.Allocator;
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const assert = debug.assert;
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const ArrayList = @import("array_list.zig").ArrayList;
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/// A buffer that allocates memory and maintains a null byte at the end.
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pub const Buffer = struct {
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list: ArrayList(u8),
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/// Must deinitialize with deinit.
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pub fn init(allocator: &Allocator, m: []const u8) -> %Buffer {
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var self = %return initSize(allocator, m.len);
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mem.copy(u8, self.list.items, m);
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return self;
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}
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/// Must deinitialize with deinit.
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pub fn initSize(allocator: &Allocator, size: usize) -> %Buffer {
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var self = initNull(allocator);
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%return self.resize(size);
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return self;
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}
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/// Must deinitialize with deinit.
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/// None of the other operations are valid until you do one of these:
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/// * ::replaceContents
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/// * ::replaceContentsBuffer
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/// * ::resize
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pub fn initNull(allocator: &Allocator) -> Buffer {
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Buffer {
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.list = ArrayList(u8).init(allocator),
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}
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}
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/// Must deinitialize with deinit.
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pub fn initFromBuffer(buffer: &const Buffer) -> %Buffer {
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return Buffer.init(buffer.list.allocator, buffer.toSliceConst());
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}
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pub fn deinit(self: &Buffer) {
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self.list.deinit();
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}
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pub fn toSlice(self: &Buffer) -> []u8 {
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return self.list.toSlice()[0..self.len()];
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}
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pub fn toSliceConst(self: &const Buffer) -> []const u8 {
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return self.list.toSliceConst()[0..self.len()];
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}
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pub fn resize(self: &Buffer, new_len: usize) -> %void {
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%return self.list.resize(new_len + 1);
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self.list.items[self.len()] = 0;
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}
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pub fn isNull(self: &const Buffer) -> bool {
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return self.list.len == 0;
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}
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pub fn len(self: &const Buffer) -> usize {
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return self.list.len - 1;
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}
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pub fn append(self: &Buffer, m: []const u8) -> %void {
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const old_len = self.len();
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%return self.resize(old_len + m.len);
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mem.copy(u8, self.list.toSlice()[old_len..], m);
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}
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pub fn appendByte(self: &Buffer, byte: u8) -> %void {
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%return self.resize(self.len() + 1);
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self.list.items[self.len() - 1] = byte;
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}
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pub fn eql(self: &const Buffer, m: []const u8) -> bool {
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mem.eql(u8, self.toSliceConst(), m)
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}
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pub fn startsWith(self: &const Buffer, m: []const u8) -> bool {
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if (self.len() < m.len) return false;
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return mem.eql(u8, self.list.items[0..m.len], m);
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}
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pub fn endsWith(self: &const Buffer, m: []const u8) -> bool {
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const l = self.len();
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if (l < m.len) return false;
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const start = l - m.len;
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return mem.eql(u8, self.list.items[start..], m);
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}
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pub fn replaceContents(self: &const Buffer, m: []const u8) -> %void {
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%return self.resize(m.len);
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mem.copy(u8, self.list.toSlice(), m);
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}
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};
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test "simple Buffer" {
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const cstr = @import("cstr.zig");
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var buf = %%Buffer.init(&debug.global_allocator, "");
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assert(buf.len() == 0);
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%%buf.append("hello");
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%%buf.appendByte(' ');
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%%buf.append("world");
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assert(buf.eql("hello world"));
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assert(mem.eql(u8, cstr.toSliceConst(buf.toSliceConst().ptr), buf.toSliceConst()));
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var buf2 = %%Buffer.initFromBuffer(&buf);
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assert(buf.eql(buf2.toSliceConst()));
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assert(buf.startsWith("hell"));
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%%buf2.resize(4);
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assert(buf.startsWith(buf2.toSliceConst()));
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}
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