.weaschem: initial, UNTESTED, parsing implementation
....it's not hooked up at all yet. WEA will not even load the file yet, and we don't have tests either ....tests might be a bit of a problem given we use minetest.parse_json directly.
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local weac = worldeditadditions_core
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local Vector3 = weac.Vector3
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--- Library for parsing .weaschem WorldEditAdditions Schematic files.
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--
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-- Most of these functions return 3 values rather than the usual 2. This might seem overcomplicated, but it enables a higher level of validation in automated testing. These 3 return values take the following form:
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--
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-- 1. bool: A success/failure bool. `true` means success, and `false`, means failure.
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-- 2. string: The error code. "SUCCESS" if #1 (the bool) is `true`. Otherwise set to a code to indicate exactly which error ocurred.
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-- 3. any|string: EITHER the expected return value, OR a string with a human-readable error message if `bool=false`.
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-- @namespace worldeditadditions_core.parse.file.weaschem
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local weaschem = {}
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--- Validates and converts a raw table into a Vector3 instance.
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-- @param source_obj table The table to convert.
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-- @returns bool,string,Vector3|string A success bool, then an error code, then finally EITHER the resulting Vector3 instance (if bool=true) OR an error message as a string.
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function weaschem.parse_vector3(source_obj)
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if type(source_obj) ~= "table" then return false, "VECTOR3_INVALID_TYPE", "Vector3: Expected a table, but got a value of type '"..type(source_obj).."'." end
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if source_obj.x == nil then return false, "VECTOR3_NO_X", "Vector3: No value for the x coordinate was found." end
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if source_obj.y == nil then return false, "VECTOR3_NO_Y", "Vector3: No value for the y coordinate was found." end
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if source_obj.z == nil then return false, "VECTOR3_NO_Z", "Vector3: No value for the z coordinate was found." end
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if type(source_obj.x) ~= "number" then return false, "VECTOR3_INVALID_X", "Vector3: The type of the x coordinate was expected to be number, but found '"..type(source_obj.x).."'." end
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if type(source_obj.y) ~= "number" then return false, "VECTOR3_INVALID_Y", "Vector3: The type of the y coordinate was expected to be number, but found '"..type(source_obj.y).."'." end
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if type(source_obj.z) ~= "number" then return false, "VECTOR3_INVALID_Z", "Vector3: The type of the z coordinate was expected to be number, but found '"..type(source_obj.z).."'." end
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local result = Vector3.clone(source_obj)
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return true, "SUCCESS", result
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end
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function weaschem.parse_header(source)
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local raw_obj = minetest.parse_json(source)
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if raw_obj == nil then return false, "HEADER_INVALID", "The header is invalid JSON." end
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local header = {}
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if raw_obj["name"] == nil then return false, "HEADER_NO_NAME", "No name property found in header."
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else
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header["name"] = raw_obj["name"]
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if type(header["name"]) ~= "string" then
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return false, "HEADER_NAME_INVALID",
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"Invalid name in header: expected string, but found value of type '"..type(raw_obj["name"])"'."
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end
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end
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if raw_obj["description"] ~= nil then
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header["description"] = raw_obj["description"]
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if type(header["description"]) ~= "string" then
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return false, "HEADER_DESCRIPTION_INVALID",
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"Invalid description in header: expected string, but found value of type '" .. type(raw_obj["description"]) "'."
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end
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end
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if raw_obj["offset"] == nil then
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return false, "HEADER_NO_OFFSET", "No offset property found in header."
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else
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local success, code, result = weaschem.parse_vector3(raw_obj["offset"])
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if not success then return success, code, result end
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header["offset"] = result
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end
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if raw_obj["size"] == nil then return false, "HEADER_NO_SIZE", "No size property found in header."
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else
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local success, code, result = weaschem.parse_vector3(raw_obj["size"])
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if not success then return success, code, result end
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header["size"] = result
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end
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if raw_obj["type"] == nil then
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return false, "HEADER_NO_TYPE", "No type property found in header."
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else
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header["type"] = raw_obj["type"]
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if type(header["type"]) ~= "string" then
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return false, "HEADER_TYPE_INVALID",
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"Invalid type in header: expected string, but found value of type '" .. type(raw_obj["type"]) "'."
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end
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if header["type"] ~= "full" and header["type"] ~= "delta" then
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return false, "HEADER_TYPE_INVALID",
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"The value of the header field type was expected to be 'full' or 'delta', but was found to be '" ..
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tostring(header["type"]) .. "'."
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end
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end
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if raw_obj["generator"] == nil then
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return false, "HEADER_NO_GENERATOR", "No generator property found in header."
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else
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header["generator"] = raw_obj["generator"]
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if type(header["generator"]) ~= "string" then
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return false, "HEADER_GENERATOR_INVALID",
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"Invalid generator in header: expected string, but found value of generator '" .. type(raw_obj["generator"]) "'."
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end
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end
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return true, "SUCCESS", header
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end
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function weaschem.parse_id_map(source)
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local raw_obj = minetest.parse_json(source)
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if raw_obj == nil then return false, "ID_MAP_INVALID", "The node id map is invalid JSON." end
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local result = {}
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for id_str, node_name in pairs(raw_obj) do
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local id = tonumber(id_str)
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if id == nil then return false, "ID_MAP_INVALID_ID", "A node id in the node id map is not parsable as a number." end
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if string.find(node_name, ":") == nil then return false, "ID_MAP_RELATIVE_NODE_NAME", "A node name does not contain a colon, suggesting it is a relative node id. Relative node ids are not supported." end
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if result[id] ~= nil then return false, "ID_MAP_DUPLICATE", "Multiple node ids in the node id map parse to the same number." end
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result[id] = node_name
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end
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return true, "SUCCESS", result
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end
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function weaschem.parse_data_table(source)
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local data_table = {}
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local values = weac.split(source, ",", true)
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local i = 0
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for _, next_val in pairs(values) do
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if next_val:find("x") ~= nil then
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local multi_count, multi_node_id = string.match(next_val, "(%d+)x(%d+)")
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multi_count = tonumber(multi_count)
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if type(multi_count) ~= "number" then
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return false, "DATA_TABLE_INVALID_COUNT", "Encountered count value in data table at position '"..tostring(i).."'."
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end
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multi_node_id = tonumber(multi_node_id)
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if type(multi_node_id) ~= "number" then
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return false, "DATA_TABLE_INVALID_NODE_ID", "Encountered node id value in data table at position '"..tostring(i).."'."
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end
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for _ = 1,multi_count do
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data_table[i] = multi_node_id
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i = i + 1
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end
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else
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local node_id = tonumber(next_val)
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if type(multi_count) ~= "number" then
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return false, "DATA_TABLE_INVALID_NODE_ID",
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"Encountered node id value in data table at position '" .. tostring(i) .. "'."
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end
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data_table[i] = node_id
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i = i + 1
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end
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end
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return true, "SUCCESS", data_table
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end
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--- Parses the WorldEditAdditions schematic file from the given handle.
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-- This requires a file handle, as significant optimisations can be made in the case of invalid files.
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-- @param handle File A Lua file handle to read from.
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-- @param delta_which string If the schematic file is of type delta (i.e. as opposed to full), then this indicates which state is desired. Useful to significantly optimise both CPU and memory usage by avoiding parsing more than necessary if only one state is desired. Possible values: both (default; read both the previous and current states), prev (read only the previous state), current (read only the current state).
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-- @returns TODO DOCUMENT THIS.
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function weaschem.parse(handle, delta_which)
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if delta_which == nil then delta_which = "both" end
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if delta_which ~= "both" and delta_which ~= "prev" and delta_which ~= "current" then
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return false, "INVALID_DELTA_WHICH", "Invalid delta_which argument. Possible values: both [default], prev, current."
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end
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local temp, temp2 = handle:read(8, 1)
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if temp ~= "WEASCHEM" then
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return false, "INVALID_MAGIC_BYTES", "The magic bytes 'WEASCHEM' were not found, so the input is an invalid .weaschem schematic."
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end
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if temp2 ~= " " then
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return false, "INVALID_MAGIC_SPACE", "Invalid character after magic bytes (expected a single U+20 space)"
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end
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local version = handle:read("*n")
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if version ~= 1 then
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return false, "INVALID_VERSION", "Invalid schematic version. Expected 1, but found '"..tostring(version).."'."
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end
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temp = handle:read(1)
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if temp ~= "\n" then
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return false, "UNEXPECTED_TOKEN", "Invalid character present after schematic version number (expected a new line character U+0A)"
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end
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temp = handle:read("*l")
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local success, code, header = weaschem.parse_header(temp)
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if not success then return success, code, header end
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temp = handle:read("*l")
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if temp == nil then return false, "NO_ID_MAP", "Unable to read the id map from the file." end
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local id_map
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success, code, id_map = weaschem.parse_id_map(temp)
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if not success then return success, code, id_map end
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local data_tables = {}
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if header["type"] == "full" then
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temp = handle:read("*l")
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if temp == nil then return false, "NO_DATA_TABLE", "Unable to read the data table full:data from the file." end
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success, code, temp2 = weaschem.parse_data_table(temp)
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if not success then return success, code, temp2 end
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data_tables["data"] = temp2
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temp = handle:read("*l")
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if temp == nil then return false, "NO_DATA_TABLE", "Unable to read the data table full:param2 from the file." end
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success, code, temp2 = weaschem.parse_data_table(temp)
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if not success then return success, code, temp2 end
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data_tables["param2"] = temp2
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else
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temp = handle:read("*l")
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if temp == nil then return false, "NO_DATA_TABLE", "Unable to read the data table delta:data_previous from the file." end
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-- delta_which="current" is the only state in which we would NOT want to parse the previous state. Regardless, we still need to read the line in though even if we immediately discard it otherwise we'll be out of sync.
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if delta_which ~= "current" then
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success, code, temp2 = weaschem.parse_data_table(temp)
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if not success then return success, code, temp2 end
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data_tables["data_prev"] = temp2
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end
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temp = handle:read("*l")
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if temp == nil then return false, "NO_DATA_TABLE", "Unable to read the data table delta:param2_previous from the file." end
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if delta_which ~= "current" then
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success, code, temp2 = weaschem.parse_data_table(temp)
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if not success then return success, code, temp2 end
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data_tables["param2_prev"] = temp2
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end
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temp = handle:read("*l")
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if temp == nil then return false, "NO_DATA_TABLE", "Unable to read the data table delta:data_current from the file." end
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if delta_which ~= "prev" then
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success, code, temp2 = weaschem.parse_data_table(temp)
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if not success then return success, code, temp2 end
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data_tables["data_current"] = temp2
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end
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temp = handle:read("*l")
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if temp == nil then return false, "NO_DATA_TABLE", "Unable to read the data table delta:param2_current from the file." end
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if delta_which ~= "prev" then
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success, code, temp2 = weaschem.parse_data_table(temp)
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if not success then return success, code, temp2 end
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data_tables["param2_current"] = temp2
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end
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end
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local result = {
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header = header,
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id_map = id_map,
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data_tables = data_tables
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}
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return true, "SUCCESS", result
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end
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return weaschem
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