[ANN] arrayfields-3.1.0 - the kirk haines release

[Ara.T.Howard]

as kirk haines right pointed out, i was not handling memory in the most
efficient manner in the 3.0.0 release. this release (3.1.0) should remedy
that with a single change to the interface. thanks kirk.


URLS:

- http://raa.ruby-lang.org/project/arrayfields/
- http://www.codeforpeople.com/lib/ruby/arrayfields/

SYNOPSIS:

allow keyword access to arrays:

require 'arrayfields'

fields = 'name', 'age'
row = [ 'bob', 30 ]

row.fields = fields

row[ 'name' ] #=> 'bob'
row.indices 'name', 'age' #=> [ 'bob', 30 ]

assigning to un-named fields appends:

stack = []
stack.fields = %w(zero one)
stack['zero'] = 'zero'
stack['one'] = 'one'
stack #=> [ 'zero', 'one' ]

useful for database work:

relation = pgconn.query sql
relation.size #=> 65536

# yikes! do we really want to re-construct a hash for for each tuple when
# we already have Arrays?

fields = %w(ssn name position)
table.each{|tuple| tuple.fields = fields}

tuples[34578]['ssn'] #=> 574865032

LIST OF OVERRIDDEN METHODS:

- Array#[]
- Array#[]=
- Array#at
- Array#delete_at
- Array#fill
- Array#values_at
- Array#indices
- Array#indexes
- Array#slice
- Array#slice!

LIST OF NEW Array METHODS:

- Array#fields=
- Array#each_with_field

DOCS/USAGE/SAMPLE:

- lib/arrayfields.rb
- test/arrayfields.rb

AUTHOR:

(e-mail address removed)

HISTORY:

3.1.0:
- added FieldSet class to reduce ram - thnx. Kirk Haines for profiliing
memory and prompting this change

- interface changed every so slightly so

a.fields = 'a', 'b', 'c'

is not allowed. use

a.fields = %w(a b c)

or

a.fields = ['a', 'b', 'c']


3.0.0:
- added unit tests

-a
--
===============================================================================
| EMAIL :: Ara [dot] T [dot] Howard [at] noaa [dot] gov
| PHONE :: 303.497.6469
| A flower falls, even though we love it;
| and a weed grows, even though we do not love it.
| --Dogen
===============================================================================

 

[nobu.nokada]

Hi,

At Wed, 30 Jun 2004 10:42:54 +0900,
Ara.T.Howard wrote in [ruby-talk:104887]:

as kirk haines right pointed out, i was not handling memory in the most
efficient manner in the 3.0.0 release. this release (3.1.0) should remedy
that with a single change to the interface. thanks kirk.

$ ruby-1.8 -r arrayfields-3.0.0 -e 'a=[]' -e 'a.fields=[:a]' -e 'a[:x]=1' -e 'p a[:x]'
1
$ ruby-1.8 -r arrayfields-3.1.0 -e 'a=[]' -e 'a.fields=[:a]' -e 'a[:x]=1' -e 'p a[:x]'
/arrayfields-3.1.0.rb:73:in `[]=': undefined method `[]=' for nil:NilClass (NoMethodError)
from -e:3

@fieldpos still remains outside FieldSet.


--- arrayfields-3.1.0.rb 2004-06-30 09:35:55.000000000 +0900
+++ arrayfields.rb 2004-06-30 12:28:14.000000000 +0900
@@ -57,5 +57,5 @@
def [](idx, *args)
#{{{
- if @fieldset and String === idx or Symbol === idx
+ if @fieldset and (String === idx or Symbol === idx)
pos = @fieldset.pos idx
return nil unless pos
@@ -69,7 +69,7 @@
def []=(idx, *args)
#{{{
- if @fieldset and String === idx or Symbol === idx
+ if @fieldset and (String === idx or Symbol === idx)
pos = @fieldset.pos idx
- @fieldpos[idx] = pos = size unless pos
+ @fieldset.fieldpos[idx] = pos = size unless pos
super(pos, *args)
else
@@ -80,5 +80,5 @@
def at idx
#{{{
- if @fieldset and String === idx or Symbol === idx
+ if @fieldset and (String === idx or Symbol === idx)
pos = @fieldset.pos idx
return nil unless pos
@@ -91,5 +91,5 @@
def delete_at idx
#{{{
- if @fieldset and String === idx or Symbol === idx
+ if @fieldset and (String === idx or Symbol === idx)
pos = @fieldset.pos idx
return nil unless pos
@@ -103,5 +103,5 @@
#{{{
idx = args.first
- if idx and @fieldset and String === idx or Symbol === idx
+ if idx and @fieldset and (String === idx or Symbol === idx)
idx = args.shift
pos = @fieldset.pos idx

 

[Ara.T.Howard]

$ ruby-1.8 -r arrayfields-3.0.0 -e 'a=[]' -e 'a.fields=[:a]' -e 'a[:x]=1' -e 'p a[:x]'
1
$ ruby-1.8 -r arrayfields-3.1.0 -e 'a=[]' -e 'a.fields=[:a]' -e 'a[:x]=1' -e 'p a[:x]'
/arrayfields-3.1.0.rb:73:in `[]=': undefined method `[]=' for nil:NilClass (NoMethodError)
from -e:3

@fieldpos still remains outside FieldSet.

<snip patch>

should all be fixed in 3.2.0 in the RAA.

thanks - long day ;-)

-a