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Speed up JSON string parsing

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We now use Lua patterns to find runs of characters. This makes string
parsing 3-4x faster. Ish - I've not run any exact benchmarks.

Closes #1408
This commit is contained in:
Jonathan Coates 2023-05-04 19:46:40 +01:00
parent 232c051526
commit 0e48ac1dfe
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GPG Key ID: B9E431FF07C98D06
2 changed files with 12 additions and 4 deletions
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14
projects/core/src/main/resources/data/computercraft/lua/rom/apis/textutils.lua
View File

@ -533,12 +533,18 @@ do
local function parse_string(str, pos, terminate)
local buf, n = {}, 1
-- We attempt to match all non-special characters at once using Lua patterns, as this
-- provides a significant speed boost. This is all characters >= " " except \ and the
-- terminator (' or ").
local char_pat = "^[ !#-[%]^-\255]+"
if terminate == "'" then char_pat = "^[ -&(-[%]^-\255]+" end
while true do
local c = sub(str, pos, pos)
if c == "" then error_at(pos, "Unexpected end of input, expected '\"'.") end
if c == terminate then break end
if c == '\\' then
if c == "\\" then
-- Handle the various escapes
c = sub(str, pos + 1, pos + 1)
if c == "" then error_at(pos, "Unexpected end of input, expected escape sequence.") end
@ -552,8 +558,10 @@ do
if not unesc then error_at(pos + 1, "Unknown escape character %q.", c) end
buf[n], n, pos = unesc, n + 1, pos + 2
end
elseif c >= '\x20' then
buf[n], n, pos = c, n + 1, pos + 1
elseif c >= " " then
local _, finish = find(str, char_pat, pos)
buf[n], n = sub(str, pos, finish), n + 1
pos = finish + 1
else
error_at(pos + 1, "Unescaped whitespace %q.", c)
end

2
projects/fabric/src/main/resources/fabric.mod.json
View File

@ -47,7 +47,7 @@
],
"depends": {
"fabricloader": ">=0.14.17",
"fabric-api": ">=0.78.0",
"fabric-api": ">=0.80.0",
"minecraft": ">=1.19.4 <1.20"
},
"accessWidener": "computercraft.accesswidener"