Internals: Source cycle

The MXML compiler handles three source formats simultaneously: ActionScript 3, MXML and CSS.

First pass

1. For all ActionScript 3 sources, enumerate every package definition into an immutable sequence = allPackages.
2. For each definition in allPackages, declare the respective ActionScript 3 package.
3. For each MXML source, declare the respective ActionScript 3 package.

Resolution passes

1. Let remPackages be a mutable clone of the allPackages sequence.
2. Let remAS be a mutable sequence containing all ActionScript 3 sources.
3. Let remMXML be a mutable sequence containing all MXML sources.
4. Let remCSS be an empty sequence.
5. While remPackages is non empty or remMXML is non empty
   1. Visit directives across remPackages or defer otherwise.
      1. Remove each element from remPackages that is of the VerifierPhase::Finished phase.
   2. Visit element in remMXML or defer otherwise.
      1. Remove each element from remMXML that is of the VerifierPhase::Finished phase.
6. For each package in allPackages
   1. Visit statements
7. While remAS is non empty
   1. Resolve directives and then statements for each remAS
   2. Remove each element from remAS that has been finished.
8. While remCSS is non empty
   1. Visit directives for each remCSS element or defer
   2. Remove each element from remCSS that has been finished.
9. Visit each deferred function expression or defer for a number of MAX_CYCLES.
10. Add verify error for each function expression that could not be resolved.
11. Finish each definition conflict, reporting any errors.
12. Reset verifier state.