Module: Dotenv::Substitutions::Variable

Defined in:
lib/dotenv/substitutions/variable.rb

Overview

Substitute variables in a value.

HOST=example.com
URL="https://$HOST"

Constant Summary collapse

VARIABLE = 
/
  (\\)?        # is it escaped with a backslash?
  (\$)         # literal $
  \{?          # allow brace wrapping
  ([A-Z0-9_]+) # match the variable
  \}?          # closing brace
/xi

Class Method Summary collapse

Class Method Details

.call(value, env) ⇒ Object 



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# File 'lib/dotenv/substitutions/variable.rb', line 20

def call(value, env)
  value.gsub(VARIABLE) do |variable|
    match = $LAST_MATCH_INFO

    if match[1] == '\\'
      variable[1..-1]
    else
      env.fetch(match[3]) { ENV[match[3]] }
    end
  end
end