Unigine.UlonNode Class
This class is used to represent a ULON node.
Each ULON node has a type, a name, and a value. It can also have child ULON nodes and a parent node, thus forming a hierarchy.
A node is declared as follows:
Source code
NodeType node_name = node_valueULON nodes can be of the following types:
- Boolean
Node node = true - Integer number
Node node = 1234 - Floating-point number
Node node = 3.1459 - String
- Quoted string with standard escape characters:
Node node = "word word" - Bare word, beginning with a lower case letter, containing only letters, digits, and underscores "_":
Node node = word1_word2 - Heredoc string enclosed in #{ ... #} (used for code fragments):
Node node = #{C++ C# USC HLSL GLSL USSL#}
- Quoted string with standard escape characters:
- Array containing a finite number of integer, float, and string elements
Node node = [100, 0.2, str str "str str str", #{vec4 asd = vec4_zero;#}] This array has the following 6 elements:- 100
- 0.2
- str
- str
- str str str
- vec4 asd = vec4_zero;
Conditions#
For each node a condition can be specified, if the condition fails the ULON node with all its children is ignored. Thus you can dynamically build the hierarchy of ULON nodes with a great degree of flexibility.
Notice
Conditions are specified after the node's name, starting with the
if keyword, the condition itself is enclosed in brackets [ ... ].
Conditions are not parsed and executed automatically, processing of conditions is the responsibility of the user of the ULON format (e.g. in case of materials UnigineScript and UUSL are used).
Condition of the parent node is added to the condition of the child: (parent_conditon) && (child_conditon)
Example:
Source code
The resulting conditions for each node are as follows:
Node parent if[var == 10 || var == 5]
{
Node child_0 if[var == 3]
Node child_1 if[var == 4]
{
Node child_2 if[var != 11]
Node child_3 if[var != 25]
}
}- parent condition: (var1 == 10 || var1 == 5)
- child_0 condition: (var1 == 10 || var1 == 5) && (var2 == 3)
- child_1 condition: (var1 == 10 || var1 == 5) && (var2 == 4)
- child_2 condition: (var1 == 10 || var1 == 5) && (var2 == 4) && (var3 != 11)
- child_3 condition: (var1 == 10 || var1 == 5) && (var2 == 4) && (var3 != 25)
UlonNode Class
Properties
string Type#
The ULON node type.
string Name#
The ULON node name.
string Condition#
The ULON node condition.
UlonValue Value#
The ULON node value.
Members
UlonNode ( ) #
Constructor. Creates a ULON node.bool Load ( string path ) #
Loads ULON-data from the specified file and sets the current ULON node to be the root of the parsed hierarchy.Arguments
- string path - Path to the file containing ULON description.
Return value
true if ULON-data from the specified file is read successfully; otherwise, false.bool Parse ( string str ) #
Parses a given string into the ULON node.Arguments
- string str - String to parse.
Return value
true if the string was parsed successfully; otherwise, false.UlonNode[] GetChildren ( ) #
Returns the list of all children of the ULON node.Return value
List of all ULON node's children.UlonArg[] GetArgs ( ) #
Returns the list of all arguments of the ULON node.Return value
List of all arguments of the ULON node.bool IsArg ( string name ) #
Checks whether an argument with a given name exists.Arguments
- string name - Name of the argument to be checked.
Return value
true if an argument with the specified name exists; otherwise, false.float GetArgFloat ( string name, float ret = 0 ) #
Returns the value of the ULON node argument with the specified name as a float.Notice
To check, if an argument exists, use the isArg() method.
Arguments
- string name - Argument name.
- float ret - Default value to be returned if a ULON node argument with the specified name is not found.
Return value
Float value of the ULON node argument, if it exists; otherwise a default value set via the ret parameter.int GetArgInt ( string name, int ret = 0 ) #
Returns the value of the ULON node argument with the specified name as an integer.Notice
To check, if an argument exists, use the isArg() method.
Arguments
- string name - Argument name.
- int ret - Default value to be returned if a ULON node argument with the specified name is not found.
Return value
Integer value of the ULON node argument, if it exists; otherwise a default value set via the ret parameter.long GetArgLong ( string name, long ret = 0 ) #
Returns the value of the ULON node argument with the specified name as a 64-bit long.Notice
To check, if an argument exists, use the isArg() method.
Arguments
- string name - Argument name.
- long ret - Default value to be returned if a ULON node argument with the specified name is not found.
Return value
64-bit long value of the ULON node argument, if it exists; otherwise a default value set via the ret parameter.bool GetArgBool ( string name, bool ret = false ) #
Returns the value of the ULON node argument with the specified name as a boolean.Notice
To check, if an argument exists, use the isArg() method.
Arguments
- string name - Argument name.
- bool ret - Default value to be returned if a ULON node argument with the specified name is not found.
Return value
Boolean value of the ULON node argument, if it exists; otherwise a default value set via the ret parameter.byte GetArgChar ( string name, byte ret = 0 ) #
Returns the value of the ULON node argument with the specified name as a char.Notice
To check, if an argument exists, use the isArg() method.
Arguments
- string name - Argument name.
- byte ret - Default value to be returned if a ULON node argument with the specified name is not found.
Return value
Char value of the ULON node argument, if it exists; otherwise a default value set via the ret parameter.string GetArgStr ( string name, string ret = "" ) #
Returns the value of the ULON node argument with the specified name as a string.Notice
To check, if an argument exists, use the isArg() method.
Arguments
- string name - Argument name.
- string ret - Default value to be returned if a ULON node argument with the specified name is not found.
Return value
String value of the ULON node argument, if it exists; otherwise a default value set via the ret parameter.string[] GetArgArray ( string name ) #
Returns the value of the ULON node argument with the specified name as an array of strings.Notice
To check, if an argument exists, use the isArg() method.
Arguments
- string name - Argument name.
Return value
Array of strings representing elements of the array value, if it exists; otherwise an empty string array.void PrintUnusedData ( string name ) #
Prints warnings of unused data (node values and arguments) for the file with the specified name to the Console for debugging.Arguments
- string name - File name.
void ClearUnusedData ( ) #
Clears all unused node data (node values and arguments).Last update:
2022-12-14
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