mirror of
https://github.com/oven-sh/bun
synced 2026-02-10 02:48:50 +00:00
33 lines
895 B
Zig
33 lines
895 B
Zig
usingnamespace @import("string_types.zig");
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const Allocator = @import("std").mem.Allocator;
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const assert = @import("std").debug.assert;
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const copy = @import("std").mem.copy;
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const StringBuilder = @This();
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len: usize = 0,
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cap: usize = 0,
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ptr: ?[*]u8 = null,
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pub fn count(this: *StringBuilder, slice: string) void {
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this.cap += slice.len;
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}
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pub fn allocate(this: *StringBuilder, allocator: *Allocator) !void {
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var slice = try allocator.alloc(u8, this.cap);
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this.ptr = slice.ptr;
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this.len = 0;
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}
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pub fn append(this: *StringBuilder, slice: string) string {
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assert(this.len <= this.cap); // didn't count everything
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assert(this.ptr != null); // must call allocate first
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copy(u8, this.ptr.?[this.len..this.cap], slice);
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const result = this.ptr.?[this.len..this.cap][0..slice.len];
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this.len += slice.len;
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assert(this.len <= this.cap);
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return result;
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}
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