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
|
#!/usr/bin/env nomsu -V6.15.13.8
#
This file contains basic error reporting code
use "core/metaprogramming"
use "core/operators"
use "core/control_flow"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
(fail $msg) compiles to
LuaCode
"at_1_fail(\(quote $msg.source), 'Failure: '..\($msg as lua expr))"
..if $msg else "error('Failure', 0)"
(assume $condition) compiles to ("
if not \($condition as lua expr) then
at_1_fail(\(quote "\($condition.source)"), "Assumption failed: This is not true.")
end
")
(assume $a == $b) compiles to ("
do
local _a, _b = \($a as lua expr), \($b as lua expr)
if _a ~= _b then
at_1_fail(\(quote "\($a.source)"),
"Assumption failed: This value is "..tostring(_a)..", but it was supposed to be "..tostring(_b)..".")
end
end
")
(assume $a != $b) compiles to ("
do
local _a, _b = \($a as lua expr), \($b as lua expr)
if _a == _b then
at_1_fail(\(quote "\($a.source)"),
"Assumption failed: This value is "..tostring(_a)..", but it wasn't supposed to be.")
end
end
")
test:
try: fail
$worked = (no)
try:
fail "xx"
..if it fails with $failure:
$worked = (yes)
..if it succeeds:
fail "'try' incorrectly ran success case."
assume ($failure, matches "xx")
unless $worked:
fail "'try' failed to recover from failure"
# Try/except
[
try $action if it succeeds $success if it fails with $msg $fallback
try $action if it fails with $msg $fallback if it succeeds $success
] all compile to:
$success_lua = ($success as lua)
if ((#"\$success_lua") > 0):
$success_lua, add "\n"
$success_lua, prepend "-- Success:\n"
$success_lua,
add "if not _fell_through then return table.unpack(_result, 2) end"
$fallback_lua = ($fallback as lua)
if ((#"\$fallback_lua") > 0):
$msg_lua = ($msg as lua expr)
if ((#"\$msg_lua") > 0):
$fallback_lua, prepend "\n\$msg_lua = _result[2]\n"
if ($msg_lua, text, is lua id):
$fallback_lua, add free vars [($msg_lua, text)]
$fallback_lua, prepend "-- Failure:\n"
return
Lua ("
do
local _fell_through = false
local _result = {pcall(function()
\($action as lua)
_fell_through = true
end)}
if _result[1] then
\$success_lua
else
\$fallback_lua
end
end
")
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
(try $action) parses as
try $action if it succeeds (do nothing) if it fails (do nothing)
(try $action if it fails $fallback) parses as
try $action if it succeeds (do nothing) if it fails $fallback
(try $action if it fails with $msg $fallback) parses as
try $action if it succeeds (do nothing) if it fails with $msg $fallback
(try $action if it succeeds $success) parses as
try $action if it succeeds $success if it fails (do nothing)
(try $action if it fails $fallback if it succeeds $success) parses as
try $action if it fails with (=lua "") $fallback if it succeeds $success
(try $action if it succeeds $success if it fails $fallback) parses as
try $action if it succeeds $success if it fails with (=lua "") $fallback
test:
$success = (no)
try:
do: fail
..then always:
$success = (yes)
..if it succeeds:
fail "'try ... then always ...' didn't propagate failure"
unless $success:
fail "'try ... then always ...' didn't execute the 'always' code"
(do $action then always $final_action) compiles to ("
do -- do/then always
local _fell_through = false
local _results = {pcall(function()
\($action as lua)
_fell_through = true
end)}
\($final_action as lua)
if not _results[1] then error(_results[2], 0) end
if not _fell_through then return table.unpack(_results, 2) end
end
")
|
