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_value

ULON 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#}
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 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).

Conditions are specified after the node's name, starting with the if keyword, the condition itself is enclosed in brackets [ ... ].

Condition of the parent node is added to the condition of the child: (parent_conditon) && (child_conditon)

Example:

Source code

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 (var == 10 || var == 5)
child_0 condition (var == 10 || var == 5) && (var == 3)
child_1 condition (var == 10 || var == 5) && (var == 4)
child_2 condition (var == 10 || var == 5) && (var == 3) && (var != 11)
child_3 condition (var == 10 || var == 5) && (var == 3) && (var != 25)

Properties:

Name	Description
string Type	ULON node type.
string Name	ULON node name.
string Condition	ULON node condition.
UlonValue Value	ULON node value.

Methods:

Name	Description View: Sort by:
UlonNode	Constructor.
Load	Loads ULON-data from the specified file and sets the current ULON node to be the root of the parsed hierarchy.
GetChildren	Returns the list of all children of the ULON node.
GetArgs	Returns the list of all arguments of the ULON node.
IsArg	Checks whether an argument with a given name exists.
GetArgFloat	Returns the value of the ULON node argument with the specified name as a float.
GetArgInt	Returns the value of the ULON node argument with the specified name as an integer.
GetArgLong	Returns the value of the ULON node argument with the specified name as a 64-bit long.
GetArgBool	Returns the value of the ULON node argument with the specified name as a boolean.
GetArgChar	Returns the value of the ULON node argument with the specified name as a char.
GetArgStr	Returns the value of the ULON node argument with the specified name as a string.
GetArgArray	Returns the value of the ULON node argument with the specified name as an array of strings.
PrintUnusedData	Prints warnings of unused data (node values and arguments) for the file with the specified name to the Console for debugging.
ClearUnusedData	Clears all unused node data (node values and arguments).

UlonNode Class

Properties

string Type#

ULON node type.

string Name#

ULON node name.

string Condition#

ULON node condition.

UlonValue Value#

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.

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.

char GetArgChar ( string name, char 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.
char 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: 2020-04-10

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