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|
HT="$(printf '\t.')"; HT="${HT%.}"
LF="$(printf '\n.')"; LF="${LF%.}"
RS="$(printf '\036.')"; RS="${RS%.}"
US="$(printf '\037.')"; US="${US%.}"
dbg()
{
dbg=true
#dbg=false
if ${dbg}; then
printf 'DEBUG: %s\n' "${@}" >&2
fi
}
. ./tokens.sh
. ./lexer.sh
complete_command()
{
if list; then
separator
return 0
fi
# Unexpected EOF
synexp ''
}
list()
{
dbg 'list()'
if and_or; then
while separator_op; do
if ! and_or; then
return 1
fi
done
return 0
fi
return 1
}
and_or()
{
dbg '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()
{
dbg 'pipeline()'
accept T_BANG
if pipe_sequence; then
return 0
fi
return 1
}
pipe_sequence()
{
dbg 'pipe_sequence()'
if command; then
while accept T_PIPE; do
if ! linebreak || ! command; then
return 1
fi
done
return 0
fi
return 1
}
command()
{
dbg 'command()'
if simple_command; then
return 0
elif compound_command; then
redirect_list
return 0
elif function_defn; then
return 0
fi
return 1
}
compound_command()
{
dbg 'compound_command()'
if brace_group; then
return 0
elif subshell; then
return 0
elif for_clause; then
return 0
elif case_clause; then
return 0
elif if_clause; then
return 0
elif while_clause; then
return 0
elif until_clause; then
return 0
fi
return 1
}
subshell()
{
dbg 'subshell()'
if accept T_LPAREN && compound_list && expect T_RPAREN; then
return 0
fi
return 1
}
compound_list()
{
dbg 'compound_list()'
newline_list
if term; then
dbg FOUND TERM
separator
return 0
fi
return 1
}
term()
{
dbg 'term()'
if and_or; then
while separator; do
and_or
done
return 0
fi
return 1
}
for_clause()
{
dbg 'for_clause()'
if accept T_FOR; then
if expect T_NAME && linebreak; then
if accept T_IN; then
wordlist
if ! sequential_sep; then
return 1
fi
fi
if do_group; then
return 0
fi
fi
fi
return 1
}
wordlist()
{
dbg 'wordlist()'
if accept T_WORD; then
while accept T_WORD; do :; done
return 0
fi
return 1
}
case_clause()
{
: TODO: Implement
return 1
}
case_list_ns()
{
: TODO: Implement
return 1
}
case_list()
{
: TODO: Implement
return 1
}
case_item_ns()
{
: TODO: Implement
return 1
}
case_item()
{
: TODO: Implement
return 1
}
pattern()
{
: TODO: Implement
return 1
}
if_clause()
{
if accept T_IF; then
if compound_list && expect T_THEN && compound_list; then
else_part
expect T_FI
return 0
fi
fi
return 1
}
else_part()
{
while accept T_ELIF; do
if compound_list && expect T_THEN && compound_list; then
continue
fi
return 1
done
if accept T_ELSE; then
if compound_list; then
return 0
fi
fi
return 1
}
while_clause()
{
if accept T_WHILE; then
if compound_list && do_group; then
return 0
fi
fi
return 1
}
until_clause()
{
if accept T_UNTIL; then
if compound_list && do_group; then
return 0
fi
fi
return 1
}
function_defn()
{
: TODO: Implement
return 1
}
function_body()
{
: TODO: Implement
return 1
}
brace_group()
{
dbg 'brace_group()'
if accept T_LBRACE && compound_list && expect T_RBRACE; then
return 0
fi
return 1
}
do_group()
{
dbg 'do_group()'
if accept T_DO && compound_list && expect T_DONE; then
return 0
fi
return 1
}
simple_command()
{
dbg 'simple_command()'
if cmd_prefix; then
if cmd_word; then
cmd_suffix
fi
return 0
elif cmd_name; then
cmd_suffix
return 0
fi
return 1
}
cmd_name()
{
dbg 'cmd_name()'
# TODO: Assignment
if accept T_CMDNAME; then
return 0
fi
return 1
}
cmd_word()
{
dbg 'cmd_word()'
# TODO: Assignment
if accept T_WORD; then
return 0
fi
return 1
}
cmd_prefix()
{
: TODO: Implement
return 1
}
cmd_suffix()
{
: TODO: Implement
return 1
}
redirect_list()
{
: TODO: Implement
return 1
}
io_redirect()
{
: TODO: Implement
return 1
}
io_file()
{
: TODO: Implement
return 1
}
filename()
{
: TODO: Implement
return 1
}
io_here()
{
: TODO: Implement
return 1
}
here_end()
{
: TODO: Implement
return 1
}
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
}
sequential_sep()
{
dbg 'sequential_sep()'
if accept T_SEMI; then
if linebreak; then
return 0
fi
elif newline_list; then
return 0
fi
return 1
}
parse()
{
local fn="${1}"
shift 1
init_lexer "${fn}"
# If this returns (does not exit), there are no errors.
while ! accept T_EOF; do
complete_command
done
get_tokens
return 0
}
try()
{
local tokens=
local t=
printf 'Trying script:\n'
printf '\t%s\n' "${@}"
if tokens="$(printf '%s\n' "${@}" | parse -)"; then
IFS="${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
printf 'FAIL\n'
fi
printf '\n\n'
}
#try '"foo bar" && $baz || qux' '${quux%uux quuux'
#try '"foo bar" && $baz || qux' '${quux%uux } quuux'
#try 'foo ${bar}'
#try 'foo ${#bar}'
#try 'foo ${bar#baz}'
#try 'foo ${#bar#}'
#try 'foo ${^}'
#try 'foo `bar`'
#try 'foo &&'
#try '{ foo; }'
#try '( foo )'
#try 'for i in 1 2 3; do stuff; done'
#try 'if foo; then bar; fi'
#try 'if foo; then bar; elif baz; then qux; else quux; fi'
#try 'if ; then ; fi'
try 'while foo; do bar; done'
try 'while ; do ; done'
|