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Bug in if... then if... parsing
- X-seq: zsh-workers 38104
- From: Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>
- To: zsh-workers@xxxxxxx
- Subject: Bug in if... then if... parsing
- Date: Sun, 6 Mar 2016 14:27:31 -0800
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Reproducible at least as long ago as zsh-4.2.0.
Consider:
torch% x () {
function> if false
function if> then
function then> x=1
function then> elif true
function elif> then
function elif-then> if :
function elif-then if> else
function else> :
function else> fi
function> }
torch%
Here it is without the PS2 prompts:
x () {
if false
then
x=1
elif true
then
if :
else
:
fi
}
This should be a parse error --
torch% if :
if> else
zsh: parse error near `else'
torch%
-- but instead it's accepted, the parser has somehow implied the
"missing" then/fi with a blank line between:
torch% functions -x4 x
x () {
if false
then
x=1
elif true
then
if :
then
fi
else
:
fi
}
torch%
I was at one point able to get the parser into a state where this caused a
correct structure to syntax error because this weird implicit "fi" doubled
an actual "fi", but it was in the context of a larger function and I lost
it from my terminal scrollback by the time I worked out that it wasn't
something I was doing wrong. It had something to do with "then" appearing
with other code on the same line rather than on a line by itself.
As far as I can tell this only happens when "if" immediately follows "then".
At first I thought the "elif" was also required, but no:
torch% if :
if> then
then> if :
then if> else
else> fi
torch%
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