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Bubberstation/code/datums/greyscale/json_reader.dm
Emmett Gaines 8eed0b2a1c Additional GAGS configuration json verification (#59524)
This standardizes how values are read from the json for greyscale layers so that error handling can check for some additional things:
No extra keys in the json that are unknown
No missing keys that a layer needs to work
Values are the expected type for that key

A variety of error messages have been added for various ways the json can be malformed and should hopefully provide good feedback for anyone working with greyscale configurations.
2021-06-13 15:23:13 -03:00

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/// Takes a json list and extracts a single value.
/// Subtypes represent different conversions of that value.
/datum/json_reader
/// Takes a value read directly from json and verifies/converts as needed to a result
/datum/json_reader/proc/ReadJson(value)
return
/datum/json_reader/text/ReadJson(value)
if(!istext(value))
CRASH("Text value expected but got '[value]'")
return value
/datum/json_reader/number/ReadJson(value)
var/newvalue = text2num(value)
if(!isnum(newvalue))
CRASH("Number expected but got [newvalue]")
return newvalue
/datum/json_reader/number_color_list/ReadJson(list/value)
if(!istype(value))
CRASH("Expected a list but got [value]")
var/list/new_values = list()
for(var/number_string in value)
var/new_value = text2num(number_string)
if(!isnum(new_value))
if(!istext(number_string) || number_string[1] != "#")
stack_trace("Expected list to only contain numbers or colors but got '[number_string]'")
continue
new_value = number_string
new_values += new_value
return new_values
/datum/json_reader/blend_mode
var/static/list/blend_modes = list(
"add" = ICON_ADD,
"subtract" = ICON_SUBTRACT,
"multiply" = ICON_MULTIPLY,
"or" = ICON_OR,
"overlay" = ICON_OVERLAY,
"underlay" = ICON_UNDERLAY,
)
/datum/json_reader/blend_mode/ReadJson(value)
var/new_value = blend_modes[lowertext(value)]
if(isnull(new_value))
CRASH("Blend mode expected but got '[value]'")
return new_value
/datum/json_reader/greyscale_config/ReadJson(value)
var/newvalue = SSgreyscale.configurations[value]
if(!newvalue)
CRASH("Greyscale configuration type expected but got '[value]'")
return newvalue