https://issues.apache.org/bugzilla/show_bug.cgi?id=56334
--- Comment #6 from Markus <p...@chamaeleon.de> ---
The question is whether EL should be processed as-is or inside some "context".
I always thought (and till 7.0.47 it seems to be the case) that EL parsing is
"context free", regardless whether the expression is in
<c:set value="${'\\?'}" ... />
or in
<set attribute="${'\\?'}" />
("context free" not meaning Chomsky Hierarchy Context Free btw. but "without
regarding the context outside the EL expression" ;)
I skimmed through the JSP 2.2 spec and while \ in JSP documents are indeed
treated specially I'd say this only applies to \ *outside* of EL expressions.
Especially when reading section JSP.10.1.11:
"For each escaped \ preceeding an unescaped expression ${foo}, a ${'\\'} must
be
generated in the XML view, and neighboring generated ${'\\'} expressions must
be combined"
I think this implies "treat \ inside EL the same way regardless of position"
("context free" in the notion above), because otherwise the spec would have to
read something like "convert \ to ${'\\'} in case A and to ${'\\\\'} in case
B".
In "The Java EE 6 Tutorial, Volume I" Chapter 6 section "Referring to Object
Properties Using Value Expressions"
http://docs.oracle.com/cd/E19226-01/820-7627/gjddd/#6nisfjmda the following
literals are defined for EL (amongst others):
"String: with single and double quotes; " is escaped as \", ' is escaped as \',
and \ is escaped as \\"
So the EL specification defines the escaping literals *inside* EL expressions
and the JSP specification defines processing rules of \ *outside* EL
expressions, and \ inside EL should not be pre-processed by some JSP specific
logic. (I could be wrong, but that's how I'd sitck together those different
pieces...)
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