Absolute Spans in the AST

[iamrecursion]

Summary

With the changes to the AST representation allowing representations of both relative and absolute spans in the program source provided by @wdanilo and @mwu-tow, we now have the beginnings of a tool for talking about program locations in a universal way between the IDE and the Engine.

However, we need a way to maintain this mapping such that one can be looked up from the other, and hence that we can actually translate in between the resolved and unresolved ASTs.

Value

We have a way to talk about locations that is unified between the IDE and the Engine.

Specification

• Work out what utilities are necessary for mapping between the relative and absolute AST representations.
• Create these utilities such that they solve the problem and such that the source location information can be appropriately threaded through the compiler pipeline and into the interpreter backend.
• Thread this location information through the compiler and interpreter such that it is prepared for further work on introspection.

Acceptance Criteria & Test Cases

• We have the tools to provide a mapping between positions in the relative and absolute AST representations.