Re: Fwd: Scope riddle I can't seem to solve. (Probably very easy to solve for an experienced coder)
Re: Fwd: Scope riddle I can't seem to solve. (Probably very easy to solve for an experienced coder)
- Subject: Re: Fwd: Scope riddle I can't seem to solve. (Probably very easy to solve for an experienced coder)
- From: Ted Wrigley <email@hidden>
- Date: Wed, 19 Mar 2014 08:37:38 -0700
| Ok, a two-rule style guide for tell blocks:
1. Keep tell blocks focused: as much as possible, they should only contain statements related to the application or object being targeted. Where you must refer to handlers from osaxen or the main script from within a tell block, use the ‘my’ or ‘of me’ specifier.
2. Avoid nesting tell blocks except where the objects being targeted are themselves nested. If there’s a practical reason to nest tell blocks for unrelated objects or applications, put the contained tell bock in a handler and call it rather than writing it directly into the other tell block.
example:
set aPath to POSIX file "/some/file/path" -- Standard Additions command, use outside of tell block
tell application "Finder" reveal aPath -- reveal is a command specific to the Finder my openFileInExcel(path) -- 'my' keyword tells the Finder to pass the request to the main script end tell
on openFileInExcel(p) -- call excel in a handler to give it its own context tell application "Microsoft Excel" open p end tell end openFileInExcel
Scripts can always be restructured to follow these rules with a bit of planning. Subject: Fwd: Scope riddle I can't seem to solve. (Probably very easy to solve for an experienced coder)
Date: March 19, 2014 at 4:48:13 AM PDT
I'm very interested if anyone has any philosophical, style guide or optimisation type answers and/or preferences to the question of when to use tell blocks. And how to use tell blocks in nested or unnested ways (pref for parallel or series usage).
|
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