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!'}

stackoverflow.com/a/9910355/1275603 maybe something like that — Grzegorz Łuszczek
– Grzegorz Łuszczek, Commented May 2, 2012 at 8:55
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
– Jordan Running, Commented May 22, 2014 at 17:00

steenslag · Accepted Answer · 2012-05-05 15:42:05Z

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 5, 2012 at 15:42

answered May 2, 2012 at 9:25

steenslag

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1 Comment

mpz Over a year ago

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 []'

peter · Accepted Answer · 2012-05-04 07:22:05Z

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 4, 2012 at 7:22

answered May 2, 2012 at 13:45

peter

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2 Comments

mpz Over a year ago

worked for: "{'key'=>'texttext' }" but not worked for "{'key'=>'text text' }"

peter Over a year ago

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

Miquel · Accepted Answer · 2012-05-02 08:53:52Z

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 2, 2012 at 8:53

Miquel

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5 Comments

Grzegorz Łuszczek Over a year ago

But you don't parse string, just creating a hash from variables

Miquel Over a year ago

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

Grzegorz Łuszczek Over a year ago

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

Miquel Over a year ago

In that case parsing is needed, maybe he could use JSON.decode()

SwiftMango Over a year ago

Parsing is necessary to interpolate the string content. Even you use eval, JSON or other libraries, they do the same thing.

wchargin · Accepted Answer · 2012-05-03 01:51:30Z

0

You could simply try this:

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

edited May 3, 2012 at 1:51

wchargin

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answered May 2, 2012 at 15:02

legendary_rob

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