458 lines
17 KiB
Lua
458 lines
17 KiB
Lua
-- This file contains what is necessary to execute/evaluate a precondition.
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--
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-- You can add your own custom functions the file:
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-- in custom_functions_you_can_override.lua
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-- this is called directly in yl_speak_up.get_fs_talkdialog
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-- it returns a list of options whose preconditions are fulfilled
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-- allow_recursion may be false - we need to avoid infinite loops
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yl_speak_up.calculate_displayable_options = function(pname, d_options, in_edit_mode, allow_recursion)
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-- Let's go through all the options and see if we need to display them to the user
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local retval = {}
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local player = minetest.get_player_by_name(pname)
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if d_options == nil then
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return {}
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end
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-- sort the entries by o_sort so that preconditions referencing options earlier in the
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-- list can work without causing loops or the like
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local sorted_list = yl_speak_up.get_sorted_options(d_options, "o_sort")
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for i, o_k in ipairs(sorted_list) do
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if(not(in_edit_mode)) then
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local o_v = d_options[ o_k ]
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-- Can we display this option?
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retval[o_k] = yl_speak_up.eval_all_preconditions(player, o_v.o_prerequisites, o_k, retval)
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-- do we need to take care of an automatic autoanswer?
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if(retval[o_k] and retval[o_k] == true and o_v.o_autoanswer and o_v.o_autoanswer == 1
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and allow_recursion) then
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-- abort here - because we already know which option needs to be selected next
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retval["autoanswer"] = o_k
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return retval
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end
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-- if in edit mode: no need to evaluate preconditions
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else
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retval[o_k ] = true
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end
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end
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return retval
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end
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-- called by calculate_displayable_options(..);
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-- returns false if a single precondition is false
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-- Important: If something cannot be determined (i.e. the node is nil),
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-- *both* the condition and its inverse condition may be
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-- true (or false).
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yl_speak_up.eval_all_preconditions = function(player, prereq, o_id, other_options_true_or_false)
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local pname = player:get_player_name()
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local n_id = yl_speak_up.speak_to[pname].n_id
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if(not(prereq)) then
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yl_speak_up.debug_msg(player, n_id, o_id, "No preconditions given.")
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-- no prerequirements? then they are automaticly fulfilled
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return true
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end
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yl_speak_up.debug_msg(player, n_id, o_id, "Checking preconditions..")
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-- we need to be fast and efficient here - and the properties stay fixed for the NPC
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-- during this call, so we can cache them
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local properties = yl_speak_up.get_npc_properties(pname)
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for k, p in pairs(prereq) do
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yl_speak_up.debug_msg(player, n_id, o_id, "..checking "..
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tostring(p.p_id)..": "..yl_speak_up.show_precondition(p, pname))
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if(not(yl_speak_up.eval_precondition(player, n_id, p, other_options_true_or_false, properties))) then
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yl_speak_up.debug_msg(player, n_id, o_id, tostring(p.p_id)..
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" -> is false. Aborting.")
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-- no need to look any further - once we hit a false, it'll stay false
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return false
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end
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end
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-- all preconditions are true
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yl_speak_up.debug_msg(player, n_id, o_id, "OK. All preconditions true.")
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return true
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end
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-- helper function for yl_speak_up.eval_precondition
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-- (needed by "state", "property" and "evaluate")
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-- Parameters:
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-- p.p_operator the operator (>, <, ==, is_set, ...) from values_operator
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-- p.p_var_cmp_value the value against which we compare
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-- var_val the current value - that one which we want to check
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yl_speak_up.eval_precondition_with_operator = function(p, var_val)
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if(p.p_operator == "not") then
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return not(var_val)
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elseif(p.p_operator == "is_set") then
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return var_val ~= nil
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elseif(p.p_operator == "is_unset") then
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return var_val == nil
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-- for security reasons: do this manually instead of just evaluating a term
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elseif(p.p_operator == "==") then
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if(p.p_var_cmp_value == nil or var_val == nil) then
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return false
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end
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-- best do these comparisons in string form to make sure both are of same type
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return tostring(var_val) == tostring(p.p_var_cmp_value)
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elseif(p.p_operator == "~=") then
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return tostring(var_val) ~= tostring(p.p_var_cmp_value)
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elseif(p.p_operator == ">=") then
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if(p.p_var_cmp_value == nil or var_val == nil) then
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return false
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end
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-- compare numeric if possible
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if(tonumber(var_val) and tonumber(p.p_var_cmp_value)) then
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return tonumber(var_val) >= tonumber(p.p_var_cmp_value)
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-- fallback: compare as strings
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else
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return tostring(var_val) >= tostring(p.p_var_cmp_value)
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end
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elseif(p.p_operator == ">") then
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if(p.p_var_cmp_value == nil or var_val == nil) then
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return false
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end
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if(tonumber(var_val) and tonumber(p.p_var_cmp_value)) then
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return tonumber(var_val) > tonumber(p.p_var_cmp_value)
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else
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return tostring(var_val) > tostring(p.p_var_cmp_value)
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end
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elseif(p.p_operator == "<=") then
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if(p.p_var_cmp_value == nil or var_val == nil) then
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return false
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end
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if(tonumber(var_val) and tonumber(p.p_var_cmp_value)) then
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return tonumber(var_val) <= tonumber(p.p_var_cmp_value)
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else
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return tostring(var_val) <= tostring(p.p_var_cmp_value)
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end
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elseif(p.p_operator == "<") then
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if(p.p_var_cmp_value == nil or var_val == nil) then
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return false
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end
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if(tonumber(var_val) and tonumber(p.p_var_cmp_value)) then
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return tonumber(var_val) < tonumber(p.p_var_cmp_value)
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else
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return tostring(var_val) < tostring(p.p_var_cmp_value)
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end
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elseif(p.p_operator == "more_than_x_seconds_ago") then
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if(p.p_var_cmp_value == nil or var_val == nil) then
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return false
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end
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if(not(tonumber(var_val)) or not(tonumber(p.p_var_cmp_value))) then
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return true
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end
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return (tonumber(var_val) + tonumber(p.p_var_cmp_value)) <
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math.floor(minetest.get_us_time()/1000000)
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elseif(p.p_operator == "less_than_x_seconds_ago") then
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if(p.p_var_cmp_value == nil or var_val == nil) then
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return false
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end
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if(not(tonumber(var_val)) or not(tonumber(p.p_var_cmp_value))) then
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return false
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end
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return (tonumber(var_val) + tonumber(p.p_var_cmp_value)) >
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minetest.get_us_time()/1000000
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-- this is currently equivalent to >= but may change in the future
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-- TODO: quest steps may be strings in the future
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elseif(p.p_operator == "quest_step_done") then
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-- if the variable is not set at all, then the quest step definitely
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-- has not been reached yet
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if((p.p_var_cmp_value == nil) or (var_val == nil)) then
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return false
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end
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-- compare numeric if possible
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if(tonumber(var_val) and tonumber(p.p_var_cmp_value)) then
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return tonumber(var_val) >= tonumber(p.p_var_cmp_value)
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-- fallback: compare as strings
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else
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return tostring(var_val) >= tostring(p.p_var_cmp_value)
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end
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-- this is currently equivalent to < but may change in the future
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-- TODO: quest steps may be strings in the future
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elseif(p.p_operator == "quest_step_not_done") then
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-- if the variable is not set at all, then the quest step definitely
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-- has not been reached yet
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if((p.p_var_cmp_value == nil) or (var_val == nil)) then
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return true
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end
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if(tonumber(var_val) and tonumber(p.p_var_cmp_value)) then
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return tonumber(var_val) < tonumber(p.p_var_cmp_value)
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else
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return tostring(var_val) < tostring(p.p_var_cmp_value)
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end
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end
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-- unsupported operator
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return false
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end
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-- checks if precondition p is true for the player and npc n_id
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yl_speak_up.eval_precondition = function(player, n_id, p, other_options_true_or_false, properties)
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if(not(p.p_type) or p.p_type == "") then
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-- empty prerequirement: automaticly true (fallback)
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return true
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elseif(p.p_type == "item") then
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-- a precondition set by using the staff;
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-- aequivalent to p.p_type == "player_inv" and p.p_itemstack == "inv_contains"
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return player:get_inventory():contains_item("main", p.p_value)
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elseif(p.p_type == "quest") then
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-- a precondition set by using the staff; intended as future quest interface?
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return false
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elseif(p.p_type == "auto") then
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-- a precondition set by using the staff; kept for compatibility
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return true
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elseif(p.p_type == "true") then
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-- mostly useful for generic dialogs
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return true
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elseif(p.p_type == "false") then
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-- mostly useful for temporally disabling options
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return false
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elseif(p.p_type == "function") then
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if(not(yl_speak_up.npc_has_priv(n_id, "precon_exec_lua", p.p_is_generic))) then
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return false
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end
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-- a precondition set by using the staff;
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-- extremly powerful (executes any lua code)
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return yl_speak_up.eval_and_execute_function(player, p, "p_")
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elseif(p.p_type == "state") then
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local var_val = false
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if(not(p.p_variable) or p.p_variable == "") then
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-- broken precondition
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return false
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-- internal custom server functions for preconditions
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elseif(table.indexof(yl_speak_up.custom_server_functions.precondition_descriptions,
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p.p_variable) > -1) then
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-- evaluate it
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var_val = yl_speak_up.custom_server_functions.precondition_eval(
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player, p.p_variable, p)
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if(p.p_operator == "true_for_param") then
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return var_val
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elseif(p.p_operator == "false_for_param") then
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return not(var_val)
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end
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else
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local pname = player:get_player_name()
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local owner = yl_speak_up.npc_owner[ n_id ]
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-- get the value of the variable
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-- the owner is alrady encoded in the variable name
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var_val = yl_speak_up.get_quest_variable_value(pname, p.p_variable)
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end
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-- actually evaulate it
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return yl_speak_up.eval_precondition_with_operator(p, var_val)
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elseif(p.p_type == "property") then
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-- fallback in case this function is called alone, without properties
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if(not(properties)) then
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local pname = player:get_player_name()
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properties = yl_speak_up.get_npc_properties(pname)
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end
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return yl_speak_up.eval_precondition_with_operator(p, properties[p.p_value])
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elseif(p.p_type == "evaluate") then
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if(not(player) or not(p.p_value)) then
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return false
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end
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local custom_data = yl_speak_up.custom_functions_p_[p.p_value]
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if(not(custom_data) or not(custom_data.code)) then
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return false
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end
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local fun = custom_data.code
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-- actually call the function
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local ret = fun(player, n_id, p)
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-- compare the result with wat is expected
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return yl_speak_up.eval_precondition_with_operator(p, ret)
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elseif(p.p_type == "block") then
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if(not(p.p_pos) or type(p.p_pos) ~= "table"
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or not(p.p_pos.x) or not(p.p_pos.y) or not(p.p_pos.z)) then
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return false
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elseif(p.p_value == "node_is_like") then
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local node = minetest.get_node_or_nil(p.p_pos)
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return (node and node.name and node.name == p.p_node and node.param2 == p.p_param2)
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elseif(p.p_value == "node_is_air") then
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local node = minetest.get_node_or_nil(p.p_pos)
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return (node and node.name and node.name == "air")
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elseif(p.p_value == "node_is_diffrent_from") then
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local node = minetest.get_node_or_nil(p.p_pos)
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return (node and node.name and (node.name ~= p.p_node or node.param2 ~= p.p_param2))
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end
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-- fallback - unsupported option
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return false
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elseif(p.p_type == "trade") then
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local pname = player:get_player_name()
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local dialog = yl_speak_up.speak_to[pname].dialog
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local n_id = yl_speak_up.speak_to[pname].n_id
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local d_id = yl_speak_up.speak_to[pname].d_id
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local o_id = yl_speak_up.speak_to[pname].o_id
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-- if there is no trade, then this condition is true
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if(not(dialog) or not(dialog.trades) or not(d_id) or not(o_id)) then
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return true
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end
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local trade = dialog.trades[ tostring(d_id).." "..tostring(o_id) ]
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-- something is wrong with the trade
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if(not(trade)
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or not(trade.pay) or not(trade.pay[1]) or not(trade.buy) or not(trade.buy[1])) then
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return false
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end
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if( p.p_value == "npc_can_sell") then
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local npc_inv = minetest.get_inventory({type="detached",
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name="yl_speak_up_npc_"..tostring(n_id)})
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return npc_inv:contains_item("npc_main", trade.buy[1])
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elseif(p.p_value == "npc_is_out_of_stock") then
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local npc_inv = minetest.get_inventory({type="detached",
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name="yl_speak_up_npc_"..tostring(n_id)})
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return not(npc_inv:contains_item("npc_main", trade.buy[1]))
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elseif(p.p_value == "player_can_buy") then
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local player_inv = player:get_inventory()
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return player_inv:contains_item("main", trade.pay[1])
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elseif(p.p_value == "player_has_not_enough") then
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local player_inv = player:get_inventory()
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return not(player_inv:contains_item("main", trade.pay[1]))
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end
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return false
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elseif(p.p_type == "player_inv" or p.p_type == "npc_inv" or p.p_type == "block_inv") then
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local inv = nil
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local inv_name = "main"
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-- determine the right inventory
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if(p.p_type == "player_inv") then
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inv = player:get_inventory()
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elseif(p.p_type == "npc_inv") then
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inv = minetest.get_inventory({type="detached",
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name="yl_speak_up_npc_"..tostring(n_id)})
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inv_name = "npc_main"
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elseif(p.p_type == "block_inv") then
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if(not(p.p_pos) or type(p.p_pos) ~= "table"
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or not(p.p_pos.x) or not(p.p_pos.y) or not(p.p_pos.z)) then
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return false
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end
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local meta = minetest.get_meta(p.p_pos)
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if(not(meta)) then
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return false
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end
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inv = meta:get_inventory()
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if(not(inv)) then
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return false
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end
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inv_name = p.p_inv_list_name
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end
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if( p.p_itemstack and p.p_value == "inv_contains") then
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return inv:contains_item(inv_name, p.p_itemstack)
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elseif(p.p_itemstack and p.p_value == "inv_does_not_contain") then
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return not(inv:contains_item(inv_name, p.p_itemstack))
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elseif(p.p_itemstack and p.p_value == "has_room_for") then
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return inv:room_for_item(inv_name, p.p_itemstack)
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elseif(p.p_value == "inv_is_empty") then
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return inv:is_empty(inv_name)
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end
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return false
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elseif(p.p_type == "player_offered_item") then
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local pname = player:get_player_name()
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local inv = minetest.get_inventory({type="detached", name="yl_speak_up_player_"..pname})
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local stack_got = inv:get_stack("npc_wants",1)
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if(stack_got:is_empty()) then
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return false -- empty stack
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end
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local stack_wanted = ItemStack(p.p_value)
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-- check group
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if(p.p_item_group and p.p_item_group ~= "") then
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local g = minetest.get_item_group(stack_got:get_name(), p.p_item_group)
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if(not(g) or g == 0) then
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return false -- wrong group
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end
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-- or: check item name
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elseif(stack_got:get_name() ~= stack_wanted:get_name()) then
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return false -- wrong item
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end
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-- independent of that: check stack size
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if(p.p_match_stack_size and p.p_match_stack_size ~= "") then
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local c_got = stack_got:get_count()
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local c_wanted = stack_wanted:get_count()
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if( p.p_match_stack_size == "exactly" and c_got ~= c_wanted) then
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return false -- not exactly the same amount as the wanted one
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elseif(p.p_match_stack_size == "less" and c_got >= c_wanted) then
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return false -- didn't get less than the given number
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elseif(p.p_match_stack_size == "more" and c_got <= c_wanted) then
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return false -- didn't get more than the given number
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elseif(p.p_match_stack_size == "another" and c_got == c_wanted) then
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return false -- got the same than the given number
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end
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end
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-- check quest_id
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if(p.p_item_quest_id and p.p_item_quest_id ~= "") then
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local meta = stack_got:get_meta()
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-- we don't check here if the item was given by the right NPC;
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-- only the quest id has to fit
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if(meta:get_string("yl_speak_up:quest_id") ~= p.p_item_quest_id) then
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return false -- wrong quest_id
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end
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-- was this quest item given to another player?
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if(meta:get_string("yl_speak_up:quest_item_for") ~= pname) then
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return false -- wrong player
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end
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end
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-- all ok
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return true
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elseif(p.p_type == "other") then
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-- are the preconditions of another option fulfilled?
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return (p.p_value
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and other_options_true_or_false
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and other_options_true_or_false[ p.p_value ] ~= nil
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and tostring(other_options_true_or_false[ p.p_value ]) == tostring(p.p_fulfilled))
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end
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-- fallback - unknown type
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return false
|
|
end
|
|
|
|
|
|
-- helper function for yl_speak_up.eval_trade_list_preconditions
|
|
yl_speak_up.eval_precondition_npc_inv = function(p, inv, inv_name)
|
|
if(p.p_type ~= "npc_inv") then
|
|
return false
|
|
end
|
|
-- determine the right inventory
|
|
if( p.p_itemstack and p.p_value == "inv_contains") then
|
|
return inv:contains_item(inv_name, p.p_itemstack)
|
|
elseif(p.p_itemstack and p.p_value == "inv_does_not_contain") then
|
|
return not(inv:contains_item(inv_name, p.p_itemstack))
|
|
elseif(p.p_itemstack and p.p_value == "has_room_for") then
|
|
return inv:room_for_item(inv_name, p.p_itemstack)
|
|
elseif(p.p_value == "inv_is_empty") then
|
|
return inv:is_empty(inv_name)
|
|
end
|
|
return false
|
|
end
|
|
|
|
|
|
-- cheaper version of eval_all_preconditions for the trade_list (d_trade);
|
|
-- returns the ID of the first option where the precondition match or nil;
|
|
-- *only* preconditions of the type "npc_inv" are evaluated!
|
|
yl_speak_up.eval_trade_list_preconditions = function(player)
|
|
local pname = player:get_player_name()
|
|
local dialog = yl_speak_up.speak_to[pname].dialog
|
|
local n_id = yl_speak_up.speak_to[pname].n_id
|
|
if(not(dialog) or not(dialog.n_dialogs) or not(dialog.n_dialogs["d_trade"])
|
|
or not(dialog.n_dialogs["d_trade"].d_options)) then
|
|
return
|
|
end
|
|
local options = dialog.n_dialogs["d_trade"].d_options
|
|
local sorted_o_list = yl_speak_up.get_sorted_options(options, "o_sort")
|
|
|
|
local inv = minetest.get_inventory({type="detached", name="yl_speak_up_npc_"..tostring(n_id)})
|
|
local inv_name = "npc_main"
|
|
-- search through all options
|
|
for i, s_o_id in ipairs(sorted_o_list) do
|
|
local prereq = options[s_o_id].o_prerequisites
|
|
local all_ok = true
|
|
for k, p in pairs(prereq) do
|
|
if(not(yl_speak_up.eval_precondition_npc_inv(p, inv, inv_name))) then
|
|
all_ok = false
|
|
break
|
|
end
|
|
end
|
|
if(all_ok) then
|
|
return s_o_id
|
|
end
|
|
end
|
|
end
|