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|
HT="$(printf '\t.')"; HT="${HT%.}"
LF="$(printf '\n.')"; LF="${LF%.}"
RS="$(printf '\036.')"; RS="${RS%.}"
US="$(printf '\037.')"; US="${US%.}"
. ./tokens.sh
. ./lexer.sh
complete_command()
{
if list; then
separator
return 0
fi
return 1
}
list()
{
if and_or; then
while separator_op; do
if ! and_or; then
return 1
fi
done
return 0
fi
return 1
}
and_or()
{
if pipeline; then
while accept T_AND_IF || accept T_OR_IF; do
if ! linebreak || ! pipeline; then
return 1
fi
done
return 0
fi
return 1
}
pipeline()
{
accept T_BANG
if pipe_sequence; then
return 0
fi
return 1
}
pipe_sequence()
{
if command; then
while accept T_PIPE; do
if ! linebreak || ! command; then
return 1
fi
done
return 0
fi
return 1
}
command()
{
# XXX: Unfinished
accept T_WORD
}
newline_list()
{
if accept T_NEWLINE; then
while accept T_NEWLINE; do
:
done
return 0
fi
return 1
}
linebreak()
{
newline_list
return 0
}
separator_op()
{
if accept T_AND || accept T_SEMI; then
return 0
fi
return 1
}
separator()
{
if separator_op && linebreak; then
return 0
elif newline_list; then
return 0
fi
return 1
}
parse()
{
local fn="${1}"
shift 1
init_lexer "${fn}"
while complete_command; do :; done
if :; then # TODO: Test for EOF or errors
get_tokens
return 0
fi
return 1
}
if tokens="$(printf '%s\n' '"foo bar" && $baz || qux' '${quux%uux } quuux' | \
parse -)"; then
IFS="${RS}"
for t in ${tokens}; do
printf 'Token: %s\n' "$(tokname "${t}")"
case "${t%${US}*}" in T_WORD)
printf ' "%s"\n' "${t#T_WORD${US}}"
;;
esac
done
unset IFS
else
echo FAIL
fi
|
