Imager::Expr::Assem3pm

Syntax

Each line can contain multiple statements separated by semi-colons.

Anything after '#' in a line is ignored.

Types of statements:

variable definition

"var" name:type

defines variable name to have type, which can be any of "n" or "num" for a numeric type or "pixel", "p" or "c" for a pixel or color type.

Variable names cannot include white-space.

operators

Operators can be split into 3 basic types, those that have a result value, those that don't and the null operator, eg. jump has no value.

The format for operators that return a value is typically:

result = operator operand ...

and for those that don't return a value:

operator operand

where operator is any valid register machine operator, result is any variable defined with "var", and operands are variables, constants or literals, or for jump operators, labels.

The set operator can be simplified to:

result = operator

All operators maybe preceded by a label, which is any non-white-space text immediately followed by a colon (':').