String to Hash conversion

Question

How i can convert string into hash?

now i use:

eval "{'1627207:28320'=>'text'}"
=> {'1627207:28320'=>'text'}

but "eval" is not good for my case - string passed from params, and such case it is not secure

Edited:

passed string can also be:

"{'1627207'=>'text', '11:167:28320'=>'text 1 / text 2 / unicode=>привет!'}"

Then need result hash:

{'1627207:28320'=>'text',
'11:167:28320'=>'text 1 / text 2 / unicode=>привет!'}

http://stackoverflow.com/a/9910355/1275603 maybe something like that — Grzegorz Łuszczek, May 02 '12 at 08:55
I guess the real question is, why are you letting your users pass Ruby code to your application? Why not a format that you can parse safely, like JSON? — Jordan Running, May 22 '14 at 17:00

steenslag · Accepted Answer · 2012-05-05T15:42:05.783

4

str = "{'1627207:28320'=>'text'}"
p Hash[*str.delete("{}'").split('=>')] #{"1627207:28320"=>"text"}

edit for different input:

str = "{'1627207:28320'=>'text', 'key2'=>'text2'}" 
p Hash[*str.delete("{}'").split(/=>|, /)] #{"1627207:28320"=>"text", "key2"=>"text2"}

edited May 05 '12 at 15:42

answered May 02 '12 at 09:25

steenslag

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it is fine, but user can pass "{'1627207:28320'=>'text', 'key2'=>'text2'}" string. Then error: `ArgumentError: odd number of arguments for Hash from (irb):in `[]' – mpz May 03 '12 at 23:39

peter · Answer 2 · 2012-05-04T07:22:05.200

2

class String
  def to_h
    h={}
    self.scan(/'(\w+.\w+)'=>'(\w+)'/).each { |k,v| h[k]=v }
    h
  end
end

p "{'1627207:28320'=>'text','test'=>'text2'}".to_h
=>{"1627207:28320"=>"text", "test"=>"text2"}

EDIT: shorter version

class String
  def to_h
    Hash[self.scan(/'([^']+)'=>'([^']+)'/)]
  end
end

edited May 04 '12 at 07:22

answered May 02 '12 at 13:45

peter

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worked for: `"{'key'=>'texttext' }"` but not worked for `"{'key'=>'text text' }"` – mpz May 03 '12 at 23:55
well, the regex needs to be oriented towards the kind of inpout that needs to be processed, adapted the shorter version to look for the char ' as delimiter – peter May 04 '12 at 07:23

score 0 · Answer 3 · answered May 02 '12 at 08:53

0

Quite straight forward:

$ irb
irb(main):001:0> k='1627207:28320'
=> "1627207:28320"
irb(main):002:0> v='text'
=> "text"
irb(main):003:0> h={k => v}
=> {"1627207:28320"=>"text"}
irb(main):004:0> h
=> {"1627207:28320"=>"text"}
irb(main):005:0>

answered May 02 '12 at 08:53

Miquel

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But you don't parse string, just creating a hash from variables – Grzegorz Łuszczek May 02 '12 at 08:56
What kind of parsing he does? In his example he gets from text to hash. If he gets an string looking like a hash then parsing is necessary as Grzegorz pointed out – Miquel May 02 '12 at 08:58
He gets `"{'some_key' => 'value'}"` string, but also could get `"{'first' => 1, 'second' => 2}"`, becouse both strings contains hash. So he need a code that could convert all string to hash – Grzegorz Łuszczek May 02 '12 at 09:02
In that case parsing is needed, maybe he could use JSON.decode() – Miquel May 02 '12 at 09:05
Parsing is necessary to interpolate the string content. Even you use eval, JSON or other libraries, they do the same thing. – SwiftMango May 02 '12 at 13:54

score 0 · Answer 4 · edited May 03 '12 at 01:51

0

You could simply try this:

text_hash['1627207:28320'] = 'text'
text_hash

edited May 03 '12 at 01:51

wchargin

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answered May 02 '12 at 15:02

legendary_rob

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String to Hash conversion

4 Answers4

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