[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #5309 Refactor Context::get_score_context ()

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Issue 5309: find_global_context () and find_score_context ()

1: find_score_context ()

Translator::find_score_context () finds the Score context enclosing
the Translator in a way similar to (but slightly more direct than)
\set Score.whatever = ... rather than depending on the global context.

Global_context::get_score_context () returns the first child, as
before, but it is no longer a virtual method of Context, and it is used
in fewer places.

2: find_global_context ()

Replace c->get_global_context () with find_global_context (c). This
function does not need to access any private information of Context, so
pulling it out simplifies the interface of Context. Calling it "find"
rather than "get" is supposed to imply more work (walking the tree).

Implement find_global_context (c) as find_top_context (c) plus a type
check. This increases code reuse and requires fewer dynamic casts.
Abort the program if the top context is not a Global context, otherwise
most callers would dereference null pointers.

https://codereview.appspot.com/561290043

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[issues:#5309] Refactor Context::get_score_context ()

Status: Started
Created: Sat Apr 21, 2018 06:37 PM UTC by Dan Eble
Last Updated: Fri Jan 03, 2020 04:00 PM UTC
Owner: Dan Eble

Global_context::get_score_context () returns the first child, as
before, but it is no longer a virtual method of Context.

Translator::find_score_context () finds the Score context enclosing
the Translator in a way similar to (but slightly more direct than)
\set Score.whatever = ... rather than depending on the global context.

http://codereview.appspot.com/346750043

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