NPC: Add execution context.

This commit is contained in:
Hector Franqui 2018-01-09 18:43:33 -05:00
parent 2dc2400b38
commit 221cfa3105

63
npc.lua
View File

@ -476,6 +476,8 @@ function npc.initialize(entity, pos, is_lua_entity, npc_stats, occupation_name)
-- relative to the last position
target_pos = {}
},
-- Execution context - map of user-declared variables when executing scripts
execution_context = {}
}
-- This flag is checked on every step. If it is true, the rest of
@ -886,6 +888,67 @@ function npc.unlock_actions(self)
npc.log("DEBUG_ACTION", "Unlocked NPC "..dump(self.npc_id).." actions")
end
--------------------------------------------
-- Execution context management functions --
--------------------------------------------
-- These functions manage the execution context, where variables are
-- stored, whether internal (loops) or user-created.
npc.execution_context = {}
-- This function adds a value to the execution context.
-- Readonly defaults to false. Returns false if failed due to
-- key-name conflict, or returns true if successful
function npc.execution_context.add(self, key, value, readonly)
-- Check if variable exists
if self.actions.execution_context[key] ~= nil then
npc.log("ERROR", "Attempt to create new variable with name "..key.." failed"..
"due to variable already existing: "..dump(self.actions.execution_context[key]))
return false
end
self.actions.execution_context[key] = {value = value, readonly = readonly}
return true
end
-- Returns the value of a given key. If not found returns nil.
function npc.execution_context.get(self, key)
local result = self.actions.execution_context[key]
if result == nil then
return nil
else
return result.value
end
end
-- This function updates a value in the execution context.
-- Returns false if the value is read-only or if key isn't found.
-- Returns true if able to update value
function npc.execution_context.set(self, key, new_value)
local var = self.actions.execution_context[key]
if var == nil then
return false
else
if var.readonly == true then
npc.log("ERROR", "Attempt to set value of readonly variable: "..key)
return false
end
var.value = new_value
end
return true
end
-- This function removes a variable from the execution context.
-- If the key doesn't exist, returns nil, otherwise, returns
-- the value removed.
function npc.execution_context.remove(self, key)
local result = self.actions.execution_context[key]
if result == nil then
return nil
else
self.actions.execution_context[key] = nil
return result
end
end
---------------------------------------------------------------------------------------
-- Schedule functionality
---------------------------------------------------------------------------------------