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author | Carlhuda <carlhuda@engineyard.com> | 2010-03-15 11:58:05 -0700 |
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committer | Carlhuda <carlhuda@engineyard.com> | 2010-03-15 14:50:43 -0700 |
commit | 9de83050d3a4b260d4aeb5d09ec4eb64f913ba64 (patch) | |
tree | 1688303e527eec441a5ec79011f06907dfe5a264 /actionpack/lib/action_view/template/handlers | |
parent | 1f2738261f3c3c061540bb20e3a1edec96b76034 (diff) | |
download | rails-9de83050d3a4b260d4aeb5d09ec4eb64f913ba64.tar.gz rails-9de83050d3a4b260d4aeb5d09ec4eb64f913ba64.tar.bz2 rails-9de83050d3a4b260d4aeb5d09ec4eb64f913ba64.zip |
Add deprecation notices for <% %>.
* The approach is to compile <% %> into a method call that checks whether
the value returned from a block is a String. If it is, it concats to the buffer and
prints a deprecation warning.
* <%= %> uses exactly the same logic to compile the template, which first checks
to see whether it's compiling a block.
* This should have no impact on other uses of block in templates. For instance, in
<% [1,2,3].each do |i| %><%= i %><% end %>, the call to each returns an Array,
not a String, so the result is not concatenated
* In two cases (#capture and #cache), a String can be returned that should *never*
be concatenated. We have temporarily created a String subclass called NonConcattingString
which behaves (and is serialized) identically to String, but is not concatenated
by the code that handles deprecated <% %> block helpers. Once we remove support
for <% %> block helpers, we can remove NonConcattingString.
Diffstat (limited to 'actionpack/lib/action_view/template/handlers')
-rw-r--r-- | actionpack/lib/action_view/template/handlers/erb.rb | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/actionpack/lib/action_view/template/handlers/erb.rb b/actionpack/lib/action_view/template/handlers/erb.rb index ac5902cc0e..705c2bf82e 100644 --- a/actionpack/lib/action_view/template/handlers/erb.rb +++ b/actionpack/lib/action_view/template/handlers/erb.rb @@ -8,6 +8,13 @@ module ActionView super(value.to_s) end alias :append= :<< + + def append_if_string=(value) + if value.is_a?(String) && !value.is_a?(NonConcattingString) + ActiveSupport::Deprecation.warn("<% %> style block helpers are deprecated. Please use <%= %>", caller) + self << value + end + end end module Template::Handlers @@ -21,14 +28,24 @@ module ActionView src << "@output_buffer.safe_concat('" << escape_text(text) << "');" end + BLOCK_EXPR = /(do|\{)(\s*\|[^|]*\|)?\s*\Z/ + def add_expr_literal(src, code) - if code =~ /(do|\{)(\s*\|[^|]*\|)?\s*\Z/ + if code =~ BLOCK_EXPR src << '@output_buffer.append= ' << code else src << '@output_buffer.append= (' << code << ');' end end + def add_stmt(src, code) + if code =~ BLOCK_EXPR + src << '@output_buffer.append_if_string= ' << code + else + super + end + end + def add_expr_escaped(src, code) src << '@output_buffer.append= ' << escaped_expr(code) << ';' end |