Imager::Expr::Assem - an assembler for producing code for the Imager register machine use Imager::Expr::Assem; my $expr = Imager::Expr->new(assem=>'...', ...) This module is a simple Imager::Expr compiler that compiles a low-level language that has a nearly 1-to-1 relationship to the internal representation used for compiled regmach code.

Syntax
Each line can contain multiple statements separated by semi-colons. Anything after '#' in a line is ignored. Types of statements: `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 whitespace. 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 regmach 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-whitespace text immediately followed by a colon (':'). Note that the current optimizer may produce incorrect optimization for your code, fortunately the optimizer will disable itself if you include any jump operator in your code. A single jump to anywhere after your final ret operator can be used to disable the optimizer without slowing down your code. There's currently no high-level code generation that can generate code with loops or real conditions. Imager(3), transform.perl, regmach.c Tony Cook <tony@develop-help.com>