From: Brendan Hansen Date: Fri, 18 Dec 2020 14:25:49 +0000 (-0600) Subject: added day 18 X-Git-Url: https://git.brendanfh.com/?a=commitdiff_plain;h=bfb018bcb8338e48b5195c4189063b57f09dfde0;p=onyx-aoc-2020.git added day 18 --- diff --git a/day18.onyx b/day18.onyx new file mode 100644 index 0000000..1010a8f --- /dev/null +++ b/day18.onyx @@ -0,0 +1,78 @@ +#include_file "core/std/wasi" + +use package core +use package core.string.reader as reader + +parse_factor :: proc (file: ^reader.StringReader) -> u64 { + reader.skip_whitespace(file); + + switch *file.data { + // Now may be a good time to add a range based case statement... + case #char "0", #char "1", #char "2", #char "3", #char "4", #char "5", #char "6", #char "7", #char "8", #char "9" { + return reader.read_u64(file); + } + + case #char "(" { + reader.skip_bytes(file, 1); + + value := parse_expression_mul(file); + + reader.skip_whitespace(file); + reader.skip_bytes(file, 1); + + return value; + } + } + + return 0; +} + +parse_expression_add :: proc (file: ^reader.StringReader) -> u64 { + reader.skip_whitespace(file); + + left := parse_factor(file); + + reader.skip_whitespace(file); + while *file.data == #char "+" { + op := reader.read_byte(file); + right := parse_factor(file); + + left += right; + + reader.skip_whitespace(file); + } + + return left; +} + +parse_expression_mul :: proc (file: ^reader.StringReader) -> u64 { + reader.skip_whitespace(file); + + left := parse_expression_add(file); + + reader.skip_whitespace(file); + while *file.data == #char "*" { + op := reader.read_byte(file); + right := parse_expression_add(file); + + left *= right; + + reader.skip_whitespace(file); + } + + return left; +} + +main :: proc (args: [] cstr) { + contents := file.get_contents("input/day18.txt"); + defer string.free(contents); + + file := reader.make(contents); + + total: u64 = 0; + while !reader.empty(^file) { + total += parse_expression_mul(^file); + } + + printf("Total: %l\n", total); +} \ No newline at 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