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c1079fc20c
The client checks Missions.prereqMissionID in LWOMissionComponent::getMissionState (0x00cd7400): text without any of !&^;,|(): is one mission ID (met when 0 or ever completed); anything else goes through its expression reader (sub_00a32980), left to right with no precedence, & , ; and, | or, ^ xor, ! ~ not, ( ) groups, and/or skipping the rest once the result is known. Each operand (sub_00c90a80): "id" is met once the mission was ever completed; "id:state" when the client's state mask of that mission equals state. DLU read the text right to left ignoring groups, so "(509|229)&(812|813|814|815)" (mission 781) was met by 509 alone; a plain ID needed the mission's state to be 8, so a repeatable being repeated blocked the missions after it (1870 after 1869); and id:state compared the mission's own state. GetClientMissionState moves to MissionPrerequisites so operands can ask for the mask. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
61 lines
2.8 KiB
C++
61 lines
2.8 KiB
C++
#pragma once
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#include <cstdint>
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#include <functional>
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#include <string>
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#include <string_view>
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#include <unordered_map>
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#include "Mission.h"
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/**
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* Utility class for checking whether or not a mission can be accepted using its prerequisites
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*/
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class MissionPrerequisites final
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{
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public:
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/**
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* Checks whether or not the mission identified by the specified ID can be accepted based on the mission inventory passed.
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* Also performs checks for daily missions (e.g. if the time out is valid).
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* @param missionId the mission ID to check prerequisites for
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* @param missions the mission inventory to check the prerequisites against
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* @return whether or not the mission identified by the specified ID can be accepted
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*/
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static bool CanAccept(uint32_t missionId, const std::unordered_map<uint32_t, Mission*>& missions);
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/**
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* Checks the prerequisites (Missions.prereqMissionID) of a mission, as the client
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* (LWOMissionComponent::getMissionState 0x00cd7400): an expression is evaluated by EvaluateExpression with
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* IsOperandMet for each operand; text without any of !&^;,|(): is one mission ID, met when 0 or once ever completed.
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* @param missionId the mission ID to check prerequisites for
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* @param missions the mission inventory to check the prerequisites against
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* @return whether or not the prerequisites of the mission identified by the specified ID are met
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*/
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static bool CheckPrerequisites(uint32_t missionId, const std::unordered_map<uint32_t, Mission*>& missions);
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/**
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* The client's state bit mask for a mission (LWOMissionComponent::getMissionState 0x00cd7400): 8 once ever
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* completed; in progress, its state (with 8 if completed before); else 1 when never completed (or repeatable) and
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* the prerequisites are met; 0 for no mission.
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*/
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static int32_t GetClientMissionState(uint32_t missionId, const std::unordered_map<uint32_t, Mission*>& missions);
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/**
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* One operand of a prerequisite expression (sub_00c90a80): "id" is met once the mission was ever completed;
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* "id:state" when the client's state mask of that mission is state (a mission naming itself counts as state 0).
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*/
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static bool IsOperandMet(std::string_view operand, uint32_t missionId, const std::unordered_map<uint32_t, Mission*>& missions);
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/**
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* The client's boolean expression evaluator (sub_00a32980): read left to right, no precedence; & , ; and, | or,
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* ^ xor, ! ~ negate the next operand, ( ) group. And/or skip their right side once the result is known; an operand
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* or group with no operator before it (other than the first) is ignored.
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*/
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static bool EvaluateExpression(std::string_view expression, const std::function<bool(std::string_view)>& isMet);
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private:
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/**
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* Cache of the prerequisite text of each mission
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*/
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static std::unordered_map<uint32_t, std::string> expressions;
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};
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