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Code Issues Releases Wiki Activity

Add option to allow repetition in JSON serialiser

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Closes #1588
This commit is contained in:
Jonathan Coates
2023-11-08 21:29:43 +00:00
parent 7b240cbf7e
commit 1d365f5a0b
2 changed files with 61 additions and 15 deletions
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52
projects/core/src/main/resources/data/computercraft/lua/rom/apis/textutils.lua
View File

@@ -448,20 +448,25 @@ do
end
end
local function serializeJSONImpl(t, tTracking, options)
local function serializeJSONImpl(t, tracking, options)
local sType = type(t)
if t == empty_json_array then return "[]"
elseif t == json_null then return "null"
elseif sType == "table" then
if tTracking[t] ~= nil then
error("Cannot serialize table with recursive entries", 0)
if tracking[t] ~= nil then
if tracking[t] == false then
error("Cannot serialize table with repeated entries", 0)
else
error("Cannot serialize table with recursive entries", 0)
end
end
tTracking[t] = true
tracking[t] = true
local result
if next(t) == nil then
-- Empty tables are simple
return "{}"
result = "{}"
else
-- Other tables take more work
local sObjectResult = "{"
@@ -469,14 +474,14 @@ local function serializeJSONImpl(t, tTracking, options)
local nObjectSize = 0
local nArraySize = 0
local largestArrayIndex = 0
local bNBTStyle = options and options.nbt_style
local bNBTStyle = options.nbt_style
for k, v in pairs(t) do
if type(k) == "string" then
local sEntry
if bNBTStyle then
sEntry = tostring(k) .. ":" .. serializeJSONImpl(v, tTracking, options)
sEntry = tostring(k) .. ":" .. serializeJSONImpl(v, tracking, options)
else
sEntry = serializeJSONString(k, options) .. ":" .. serializeJSONImpl(v, tTracking, options)
sEntry = serializeJSONString(k, options) .. ":" .. serializeJSONImpl(v, tracking, options)
end
if nObjectSize == 0 then
sObjectResult = sObjectResult .. sEntry
@@ -493,7 +498,7 @@ local function serializeJSONImpl(t, tTracking, options)
if t[k] == nil then --if the array is nil at index k the value is "null" as to keep the unused indexes in between used ones.
sEntry = "null"
else -- if the array index does not point to a nil we serialise it's content.
sEntry = serializeJSONImpl(t[k], tTracking, options)
sEntry = serializeJSONImpl(t[k], tracking, options)
end
if nArraySize == 0 then
sArrayResult = sArrayResult .. sEntry
@@ -505,12 +510,19 @@ local function serializeJSONImpl(t, tTracking, options)
sObjectResult = sObjectResult .. "}"
sArrayResult = sArrayResult .. "]"
if nObjectSize > 0 or nArraySize == 0 then
return sObjectResult
result = sObjectResult
else
return sArrayResult
result = sArrayResult
end
end
if options.allow_repetitions then
tracking[t] = nil
else
tracking[t] = false
end
return result
elseif sType == "string" then
return serializeJSONString(t, options)
@@ -844,10 +856,16 @@ This is largely intended for interacting with various functions from the
@param[1] t The value to serialise. Like [`textutils.serialise`], this should not
contain recursive tables or functions.
@tparam[1,opt] { nbt_style? = boolean, unicode_strings? = boolean } options Options for serialisation.
- `nbt_style`: Whether to produce NBT-style JSON (non-quoted keys) instead of standard JSON.
- `unicode_strings`: Whether to treat strings as containing UTF-8 characters instead of
using the default 8-bit character set.
@tparam[1,opt] {
nbt_style? = boolean,
unicode_strings? = boolean,
allow_repetitions? = boolean
} options Options for serialisation.
- `nbt_style`: Whether to produce NBT-style JSON (non-quoted keys) instead of standard JSON.
- `unicode_strings`: Whether to treat strings as containing UTF-8 characters instead of
using the default 8-bit character set.
- `allow_repetitions`: Relax the check for recursive tables, allowing them to appear multiple
times (as long as tables do not appear inside themselves).
@param[2] t The value to serialise. Like [`textutils.serialise`], this should not
contain recursive tables or functions.
@@ -868,6 +886,7 @@ functions and tables which appear multiple times.
@since 1.7
@changed 1.106.0 Added `options` overload and `unicode_strings` option.
@changed 1.109.0 Added `allow_repetitions` option.
@see textutils.json_null Use to serialise a JSON `null` value.
@see textutils.empty_json_array Use to serialise a JSON empty array.
@@ -880,6 +899,9 @@ function serializeJSON(t, options)
elseif type(options) == "table" then
field(options, "nbt_style", "boolean", "nil")
field(options, "unicode_strings", "boolean", "nil")
field(options, "allow_repetitions", "boolean", "nil")
else
options = {}
end
local tTracking = {}

24
projects/core/src/test/resources/test-rom/spec/apis/textutils_spec.lua
View File

@@ -187,6 +187,30 @@ describe("The textutils library", function()
expect(textutils.serializeJSON("\u{1f62f}", { unicode_strings = true })):eq([["\uD83D\uDE2F"]])
expect(textutils.serializeJSON("\\\"\u{00ff}\n\"", { unicode_strings = true })):eq('"\\\\\\"\\u00FF\\n\\""')
end)
it("fails on recursive/repeated tables", function()
local rep = {}
expect.error(textutils.serialiseJSON, { rep, rep }):eq("Cannot serialize table with repeated entries")
local rep2 = { 1 }
expect.error(textutils.serialiseJSON, { rep2, rep2 }):eq("Cannot serialize table with repeated entries")
local recurse = {}
recurse[1] = recurse
expect.error(textutils.serialiseJSON, recurse):eq("Cannot serialize table with recursive entries")
end)
it("can allow repeated tables", function()
local rep = {}
expect(textutils.serialiseJSON({ rep, rep }, { allow_repetitions = true })):eq("[{},{}]")
local rep2 = { 1 }
expect(textutils.serialiseJSON({ rep2, rep2 }, { allow_repetitions = true })):eq("[[1],[1]]")
local recurse = {}
recurse[1] = recurse
expect.error(textutils.serialiseJSON, recurse, { allow_repetitions = true }):eq("Cannot serialize table with recursive entries")
end)
end)
describe("textutils.unserializeJSON", function()