In Ruby 1.9, the String class no longer works as a C-style array of (8-bit)
characters, but supports multiple encoding. While it is obviously a task
for the developer to ensure that the data array passed to the
Ragel-generated code is in a compatible encoding, this also means that the
simple dereference is not going to work:
% ruby18 -e 'puts "foo"[0].class'
Fixnum
% ruby19 -e 'puts "foo"[0].class'
String
This is easily fixed by calling the #ord method on the dereferenced data,
which will provide the ASCII ordinal (or UNICODE codepoint) for the single
character.
The produced code works correctly both on Ruby 1.8 and 1.9.2.
---
ragel/rubycodegen.cpp | 7 +++++--
1 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/ragel/rubycodegen.cpp b/ragel/rubycodegen.cpp
index 5117823..f329587 100644
--- a/ragel/rubycodegen.cpp
+++ b/ragel/rubycodegen.cpp
@@ -307,8 +307,11 @@ string RubyCodeGen::GET_KEY()
ret << ")";
}
else {
- /* Expression for retrieving the key, use simple dereference. */
- ret << DATA() << "[" << P() << "]";
+ /* Expression for retrieving the key, use dereference
+ * and read ordinal, for compatibility with Ruby
+ * 1.9.
+ */
+ ret << DATA() << "[" << P() << "].ord";
}
return ret.str();
}
--
1.7.3.3
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