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author | Lawrence Pit <lawrence.pit@gmail.com> | 2009-07-06 10:27:31 +1000 |
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committer | Yehuda Katz <wycats@yehuda-katzs-macbookpro41.local> | 2009-07-07 16:21:57 -0700 |
commit | da635394c1c3004f4dacf4a35275404e5b1aef43 (patch) | |
tree | 2fc08f61477d70c761ea69b8ab577c383c5b34ff /activesupport/lib/active_support/core_ext/string | |
parent | 187d90f7529e02c3c863e6b68b45d8e34f315140 (diff) | |
download | rails-da635394c1c3004f4dacf4a35275404e5b1aef43.tar.gz rails-da635394c1c3004f4dacf4a35275404e5b1aef43.tar.bz2 rails-da635394c1c3004f4dacf4a35275404e5b1aef43.zip |
Ruby 1.9 style String interpolation support for lower ruby versions. Thanks to code from Masao Mutoh's GetText gem. [#2870 state:resolved]
Signed-off-by: Yehuda Katz <wycats@yehuda-katzs-macbookpro41.local>
Diffstat (limited to 'activesupport/lib/active_support/core_ext/string')
-rw-r--r-- | activesupport/lib/active_support/core_ext/string/interpolation.rb | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/string/interpolation.rb b/activesupport/lib/active_support/core_ext/string/interpolation.rb new file mode 100644 index 0000000000..b21977ecc1 --- /dev/null +++ b/activesupport/lib/active_support/core_ext/string/interpolation.rb @@ -0,0 +1,87 @@ +if RUBY_VERSION < '1.9' + +=begin + string.rb - Extension for String. + + Copyright (C) 2005-2009 Masao Mutoh + + You may redistribute it and/or modify it under the same + license terms as Ruby. +=end + +# This feature is included in Ruby 1.9 or later but not occur TypeError. +# +# String#% method which accepts named arguments. Particularly useful if the +# string is to be used by a translator because named arguments mean more +# than %s/%d style. +class String + + unless instance_methods.find {|m| m.to_s == 'bytesize'} + # For older ruby (such as ruby-1.8.5) + alias :bytesize :size + end + + alias :_old_format_m :% # :nodoc: + + PERCENT_MATCH_RE = Regexp.union( + /%%/, + /%\{(\w+)\}/, + /%<(\w+)>(.*?\d*\.?\d*[bBdiouxXeEfgGcps])/ + ) + + # call-seq: + # %(arg) + # %(hash) + # + # Format - Uses str as a format specification, and returns the result of applying it to arg. + # If the format specification contains more than one substitution, then arg must be + # an Array containing the values to be substituted. See Kernel::sprintf for details of the + # format string. This is the default behavior of the String class. + # * arg: an Array or other class except Hash. + # * Returns: formatted String + # Example: + # "%s, %s" % ["Masao", "Mutoh"] + # + # Also you can use a Hash as the "named argument". This is recommended way so translators + # can understand the meanings of the msgids easily. + # * hash: {:key1 => value1, :key2 => value2, ... } + # * Returns: formatted String + # Example: + # For strings. + # "%{firstname}, %{familyname}" % {:firstname => "Masao", :familyname => "Mutoh"} + # + # With field type to specify format such as d(decimal), f(float),... + # "%<age>d, %<weight>.1f" % {:age => 10, :weight => 43.4} + def %(args) + if args.kind_of?(Hash) + ret = dup + ret.gsub!(PERCENT_MATCH_RE) {|match| + if match == '%%' + '%' + elsif $1 + key = $1.to_sym + args.has_key?(key) ? args[key] : match + elsif $2 + key = $2.to_sym + args.has_key?(key) ? sprintf("%#{$3}", args[key]) : match + end + } + ret + else + ret = gsub(/%([{<])/, '%%\1') + begin + ret._old_format_m(args) + rescue ArgumentError => e + if $DEBUG + $stderr.puts " The string:#{ret}" + $stderr.puts " args:#{args.inspect}" + puts e.backtrace + else + raise ArgumentError, e.message + end + end + end + end +end + +end
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