From 29398e1848b0615afda30fb1da4ec8d81eccc1c5 Mon Sep 17 00:00:00 2001 From: Louis Pilfold Date: Sun, 8 Aug 2021 22:14:56 +0100 Subject: Bit string slice --- src/gleam_stdlib.js | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) (limited to 'src/gleam_stdlib.js') diff --git a/src/gleam_stdlib.js b/src/gleam_stdlib.js index b63a4ea..51de04a 100644 --- a/src/gleam_stdlib.js +++ b/src/gleam_stdlib.js @@ -213,8 +213,11 @@ export function log(term) { } export function stringify(data) { - let replacer = (_key, value) => - typeof value === "bigint" ? value.toString() + "n" : value; + let replacer = (_key, value) => { + if (typeof value === "bigint") return value.toString() + "n"; + if (typeof value === "undefined") return null; + return value; + }; try { return JSON.stringify(data, replacer); } catch (_error) { @@ -263,3 +266,10 @@ export function truncate(float) { export function power(base, exponent) { return Math.pow(base, exponent); } + +export function bit_string_slice(bits, position, length) { + let start = Math.min(position, position + length); + let end = Math.max(position, position + length); + if (start < 0 || end > bits.byteLength) return gleam_error(Nil); + return gleam_ok(new Uint8Array(bits.buffer, start, Math.abs(length))); +} -- cgit v1.2.3