blob: d85a42e5a21c810afc8fdfbf3de0ba58b04b0ee7 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
|
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
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}"
# If this returns (does not exit), there are no errors.
while complete_command; do :; 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`'
|
