NML:Elementary values

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Expressions

Elementary values

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NewGRF compatibility

Deprecated syntax

Changes from NML 0.2 to 0.3

Changes from NML 0.3 to 0.4

Changes from NML 0.4 to 0.5

Vehicles, Stations, Roadstops, Canals, Towns, Houses, Industries (Tiles), Cargos, Airports+Tiles, Objects, Railtypes, Roadtypes, Tramtypes, Bridges, Badges, Terrain

NML Tutorial

Expressions

Elementary values

Builtin functions

Elementary values in expressions are

Element	Syntax (Python RE)	Description
Decimal number	[0-9]+	one or more digits
Hexadecimal number	0x[0-9A-Fa-f]+	"0x" followed by one or more hexadecimal digits
Floating point number	[0-9]+\.[0-9]+	a decimal number, a dot, and another decimal number. Only supported for some properties that expect a floating point number.
Identifier	[a-zA-Z_][a-zA-Z0-9_]*	a letter or underscore, optionally followed by more letters, digits, or underscore characters
String	"([^"\\]|\\.)*"	A double quote character, followed by zero or more characters, ending with another double quote character. A character in-between is any single character except a double quote or a back-slash ("\"). It can also be "\\", "\n", "\t", or "\[0-9A-Fa-f][0-9A-Fa-f]" (a back-slash followed by exactly two hexadecimal digits).
Setting	an Identifier	The name of a GRF setting
Parameter	param[<num>]	Read/write the parameter with the given number.
Parameter from another GRF	param[<grfid>, <num>]	Read the value of a parameter of another grf
Unit	mph|km/h|m/s|hp|kW|hpI|hpM|tons|ton|kg|snow%	See the section on units.

You can combine those elementary values using operators like you're used to from other languages. The following operators are supported:

• Arithmetic operators: +, -, *, /, %
• Bitwise/logic operators: &, |, ^, &&, ||, <<, >>
• Comparison operators: ==, !=, <=, >=, <, >
• Ternary operator: ? : (only for integers)