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Richard Smithandjosh11b
4ddba4ab1e
* Use generics in more places. * Use `ref` in more places. * Use `for` in more places. * Use a little bit of C++ interop. * Use an adapter for the `char`-or-EOF result of reading a char instead of pure `i32`, and use char literals where possible. --------- Co-authored-by: josh11b <15258583+josh11b@users.noreply.github.com>
48 lines
1.3 KiB
Plaintext
48 lines
1.3 KiB
Plaintext
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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// https://adventofcode.com/2024/day/3
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library "day3_common";
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import library "io_utils";
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// Reads "mul(a,b)", and returns (true, a, b).
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// On error, stops before the first invalid character and returns (false, 0, 0).
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// TODO: -> Optional((i32, i32))
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fn ReadMul() -> (bool, i32, i32) {
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var a: i32;
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var b: i32;
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if (ConsumeChar('m') and ConsumeChar('u') and ConsumeChar('l') and
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ConsumeChar('(') and ReadInt(ref a) and ConsumeChar(',') and
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ReadInt(ref b) and ConsumeChar(')')) {
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return (true, a, b);
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}
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return (false, 0, 0);
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}
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// Reads "do()" or "don't()", and returns (true, was_do).
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// On error, stops before the first invalid character and returns (false, false).
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fn ReadDoOrDont() -> (bool, bool) {
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// "do"
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if (not ConsumeChar('d') or not ConsumeChar('o')) {
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return (false, false);
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}
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var do: bool = true;
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// "n't"
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if (ConsumeChar('n')) {
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if (not ConsumeChar('\'') or not ConsumeChar('t')) {
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return (false, false);
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}
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do = false;
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}
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// "()"
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if (not ConsumeChar('(') or not ConsumeChar(')')) {
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return (false, false);
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}
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return (true, do);
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}
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