Object
Extension for String class. This feature is included in Ruby 1.9 or later but not occur TypeError.
String#% method which accept “named argument”. The translator can know the meaning of the msgids using “named argument” instead of %s/%d style.
% uses self (i.e. the String) as a format specification and returns the result of applying it to the given arguments. In other words it interpolates the given arguments to the string according to the formats the string defines.
There are three ways to use it:
Using a single argument or Array of arguments.
This is the default behaviour of the String class. See Kernel#sprintf for more details about the format string.
Example:
"%d %s" % [1, "message"] # => "1 message"
Using a Hash as an argument and unformatted, named placeholders.
When you pass a Hash as an argument and specify placeholders with %{foo} it will interpret the hash values as named arguments.
Example:
"%{firstname}, %{lastname}" % {:firstname => "Masao", :lastname => "Mutoh"} # => "Masao Mutoh"
Using a Hash as an argument and formatted, named placeholders.
When you pass a Hash as an argument and specify
placeholders with %
Example:
"%<integer>d, %<float>.1f" % { :integer => 10, :float => 43.4 } # => "10, 43.3"
# File lib/i18n/core_ext/string/interpolate.rb, line 79 79: def %(args) 80: if args.kind_of?(Hash) 81: dup.gsub(INTERPOLATION_PATTERN_WITH_ESCAPE) do |match| 82: if match == '%%' 83: '%' 84: else 85: key = ($1 || $2).to_sym 86: raise KeyError unless args.has_key?(key) 87: $3 ? sprintf("%#{$3}", args[key]) : args[key] 88: end 89: end 90: elsif self =~ INTERPOLATION_PATTERN 91: raise ArgumentError.new('one hash required') 92: else 93: result = gsub(/%([{<])/, '%%\1') 94: result.send :'interpolate_without_ruby_19_syntax', args 95: end 96: end
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