Closes Homebrew/homebrew#18247.

Closes Homebrew/homebrew#17344.

Closes Homebrew/homebrew#17399.

Now that we are testing for a custom exception type, we don't need to
make any assertion about the message.

Fixes Homebrew/homebrew#19363.

Fixes Homebrew/homebrew#19265.

Removes any global methods from formulae, and moves #kext_prefix (which
seems to be at least somewhat abstractable) into the Formula class. The
only formula with global methods is now aspell; it (and its generating
script in contrib) has been changed to prefix that method with
`aspell_`, to minimize the risk of name collisions.

Closes Homebrew/homebrew#19331.
Closes Homebrew/homebrew#19343.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Closes Homebrew/homebrew#19324.

It was pointed out that this isn't used at all.

Closes Homebrew/homebrew#19074.

After converting to Pathname to create paths, using '+=' will result in
path concatenation by '/', which result in weird path like
'gcc--svn/-HEAD'. This patch should fix this.

Closes Homebrew/homebrew#19233.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Currently we check if "tag" is present in LANGUAGE_MODULES for every
String dep, even if tag is nil. Stop doing this, and make the
LANGUAGE_MODULES array into a Set instead to improve lookup performance.

Closes Homebrew/homebrew#19227.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

See 05a456c231dc6da7cb0f7c70cb21feaf9a0d803c; same story.

This is an internal method, but is called a bunch of times in
performance-critical codepaths, and is ultra slow because the constant
is interpoplated into the Regexp each time the method is called.

Alas, this has been fixed in Ruby 1.9+.

A FormulaPin object is created every time Formula is instantiated, so
don't do filesystem operations or Pathname concatenation eagerly.