DataNode
An object used internally by the Milo engine to represent a value of some type. Arrays of DataNodes are called DataArrays. In a DTB file, the type is explicitly stored, but in DTA files, it is guessed based on the syntax and keywords.
Structure
| Name | Type | Size | Function |
|---|---|---|---|
| mValue | Varies | 4 bytes | The value of the DataNode. |
| mType | DataType | 4 bytes | The type of the DataNode. |
Types
Each Milo game supports a different set of types for a DataNode. The amount of types gradually increased as Milo's scripting engine became more capable over the years. NOTE: in code, kDataInteger and kDataUnhandled are swapped. This is presumably to allow the engine to check whether or not a node is typed with a simple "is nonzero" check.
Rock Band 3
| Type Name | Value | Description |
|---|---|---|
| kDataInteger | 0x0 | An integer value. |
| kDataFloat | 0x1 | A 32-bit floating point value. |
| kDataVar | 0x2 | A generic variable. Prefixed by $ in DTA.
|
| kDataFunc | 0x3 | A DataFunc declaration. |
| kDataObject | 0x4 | A pointer to some sort of object. |
| kDataSymbol | 0x5 | A pointer to a Symbol. |
| kDataUnhandled | 0x6 | No value. |
| kDataIfdef | 0x7 | A conditional checking for the existence of a global macro (such as _SHIP). |
| kDataElse | 0x8 | The 'else' conditional. |
| kDataEndif | 0x9 | The 'endif' conditional. |
| kDataArray | 0x10 | A pointer to a DataArray. Denoted by () in DTA.
|
| kDataCommand | 0x11 | Executable statements/DataFunc calls. Denoted by {} in DTA.
|
| kDataString | 0x12 | A string value. Usually delimited by single or double quotes in DTA. |
| kDataProperty | 0x13 | A pointer to the property of an object. Denoted by [] in DTA.
|
| kDataGlob | 0x14 | A length of binary data. Effectively unused. |
| kDataDefine | 0x20 | A Macro definition. |
| kDataInclude | 0x21 | A marker indicating that another DTA/DTB should be included in the current file. |
| kDataMerge | 0x22 | A marker indicating that another DTA/DTB should be merged into the current file. Merging is done by bringing in array elements that are not already defined. |
| kDataIfndef | 0x23 | A conditional checking for the non-existence of a global macro (such as _SHIP). |
| kDataAutorun | 0x24 | Automatically executes a kDataCommand upon loading. |
| kDataUndef | 0x25 | Undefines a defined macro. |