union: support enum, scalar, and predefined/reused/custom-name struct for union fields

[Kybxd]

• close union(protogen): reuse same field type for different fields #81

Union Definition

Name	Alias	Type	Field1	Field2	#Note
Fruit	Fruit	enum<.FruitType>			Bound to predefined enum
Point	Point	int32			Bound to scalar
Item	Item	.Item			Bound to global predefined struct
Player	Player		ID uint32	Name string	Bound to local defined struct
Friend	Friend	Player			Bound to local predefined in the same level
Monster	Monster	CustomMonster	Health uint32	Attack int32	Bound to local defined struct with custom type name
Boss	Boss	CustomMonster			Bound to local predefined struct in the same level

Generate Proto

message UnionTypedTarget {
  option (tableau.union) = {name:"UnionTypedTarget"};

  Type type = 9999 [(tableau.field) = {name:"Type"}];
  oneof value {
    option (tableau.oneof) = {field:"Field"};

    protoconf.FruitType fruit = 1; // Bound to enum value: TYPE_FRUIT.
    int32 point = 2; // Bound to enum value: TYPE_POINT.
    protoconf.Item item = 3; // Bound to enum value: TYPE_ITEM.
    Player player = 4; // Bound to enum value: TYPE_PLAYER.
    Player friend = 5; // Bound to enum value: TYPE_FRIEND.
    CustomMonster monster = 6; // Bound to enum value: TYPE_MONSTER.
    CustomMonster boss = 7; // Bound to enum value: TYPE_BOSS.
  }

  enum Type {
    TYPE_INVALID = 0;
    TYPE_FRUIT = 1 [(tableau.evalue).name = "Fruit"]; // Fruit
    TYPE_POINT = 2 [(tableau.evalue).name = "Point"]; // Point
    TYPE_ITEM = 3 [(tableau.evalue).name = "Item"]; // Item
    TYPE_PLAYER = 4 [(tableau.evalue).name = "Player"]; // Player
    TYPE_FRIEND = 5 [(tableau.evalue).name = "Friend"]; // Friend
    TYPE_MONSTER = 6 [(tableau.evalue).name = "Monster"]; // Monster
    TYPE_BOSS = 7 [(tableau.evalue).name = "Boss"]; // Boss
  }

  message Player {
    uint32 id = 1 [(tableau.field) = {name:"ID"}];
    string name = 2 [(tableau.field) = {name:"Name"}];
  }
  message CustomMonster {
    int32 health = 1 [(tableau.field) = {name:"Health"}];
    int32 attack = 2 [(tableau.field) = {name:"Attack"}];
  }
}

Usage

Type	Field1	Field2
[.UnionTypedTarget]enum<.UnionTypedTarget.Type>	union	union
Target type	Target field1	Target field2
Fruit	Orange
Point	10
Item	1001	10
Player	1	Tom
Friend	2	Jerry
Monster	2000	100
Boss	20000	200

Generate Conf

{
    "unionTypedTargetList": [
        {
            "type": "TYPE_FRUIT",
            "fruit": "FRUIT_TYPE_ORANGE"
        },
        {
            "type": "TYPE_POINT",
            "point": 10
        },
        {
            "type": "TYPE_ITEM",
            "item": {
                "id": 1001,
                "num": 10
            }
        },
        {
            "type": "TYPE_PLAYER",
            "player": {
                "id": 1,
                "name": "Tom"
            }
        },
        {
            "type": "TYPE_FRIEND",
            "friend": {
                "id": 2,
                "name": "Jerry"
            }
        },
        {
            "type": "TYPE_MONSTER",
            "monster": {
                "health": 2000,
                "attack": 100
            }
        },
        {
            "type": "TYPE_BOSS",
            "boss": {
                "health": 20000,
                "attack": 200
            }
        }
    ]
}

[codecov]

Codecov Report

❌ Patch coverage is 76.08696% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.27%. Comparing base (c89e1f0) to head (9bad475).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/excel/excel.go	65.62%	7 Missing and 4 partials ⚠️
internal/confgen/table_parser.go	76.47%	5 Missing and 3 partials ⚠️
internal/protogen/sheet_mode.go	57.14%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #301   +/-   ##
=======================================
  Coverage   71.27%   71.27%           
=======================================
  Files          84       84           
  Lines       10371    10392   +21     
=======================================
+ Hits         7392     7407   +15     
- Misses       2409     2413    +4     
- Partials      570      572    +2     

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