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#!/usr/bin/env nomsu -V7.0.0
###
This file contains basic error reporting code
use "core/metaprogramming"
use "core/operators"
use "core/control_flow"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
(fail $msg) compiles to ("
at_1_fail(\(quote (this tree).source),
\(($msg as lua expr) if $msg else (quote "A failure was triggered here'"))
)
")
(assume $condition) compiles to:
if ($condition.type == "Action"):
when $condition.stub is:
"1 ==":
return Lua ("
do -- Assumption:
local _a, _b = \($condition.1 as lua expr), \($condition.3 as lua expr)
if _a ~= _b then
_a = type_of(_a) == 'Text' and _a:as_lua() or _1_as_text(_a)
_b = type_of(_b) == 'Text' and _b:as_lua() or _1_as_text(_b)
at_1_fail(\(quote "\($condition.1.source)"),
"Assumption failed: This value was ".._a.." but it was expected to be ".._b..".")
end
end
")
"1 !=":
return Lua ("
do -- Assumption:
local _a, _b = \($condition.1 as lua expr), \($condition.3 as lua expr)
if _a == _b then
_a = type_of(_a) == 'Text' and _a:as_lua() or _1_as_text(_a)
at_1_fail(\(quote "\($condition.1.source)"),
"Assumption failed: This value was ".._a.." but it wasn't expected to be.")
end
end
")
"1 >" "1 <" "1 >=" "1 <=":
return Lua ("
do -- Assumption:
local _a, _b = \($condition.1 as lua expr), \($condition.3 as lua expr)
if _a ~= _b then
_a = type_of(_a) == 'Text' and _a:as_lua() or _1_as_text(_a)
_b = type_of(_b) == 'Text' and _b:as_lua() or _1_as_text(_b)
at_1_fail(\(quote "\($condition.1.source)"),
"Assumption failed: This value was ".._a..", but it was expected to be \
..\($condition.2)".._b..".")
end
end
")
"1 is":
return Lua ("
do -- Assumption:
local _a, _b = \($condition.1 as lua expr), \($condition.3 as lua expr)
if not _1_is(_a, _b) then
_a = type_of(_a) == 'Text' and _a:as_lua() or _1_as_text(_a)
at_1_fail(\(quote "\($condition.1.source)"),
"Assumption failed: This value (".._a..") was expected to be ".._b..", but wasn't.")
end
end
")
"1 isn ' t" "1 is not":
return Lua ("
do -- Assumption:
local _a, _b = \($condition.1 as lua expr), \($condition.(#$condition) as lua expr)
if _1_is(_a, _b) then
_a = type_of(_a) == 'Text' and _a:as_lua() or _1_as_text(_a)
at_1_fail(\(quote "\($condition.1.source)"),
"Assumption failed: This value (".._a..") was expected to not be ".._b..", but it was.")
end
end
")
return Lua ("
if not \($condition as lua expr) then
at_1_fail(\(quote "\($condition.source)"), "Assumption failed: This assumption did not hold.")
end
")
(assume $a == $b) parses as (assume ($a == $b))
(assume $a != $b) parses as (assume ($a != $b))
(test that $condition) parses as (assume $condition)
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 = {xpcall(function()
\($action as lua)
_fell_through = true
end, enhance_error)}
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 = {xpcall(function()
\($action as lua)
_fell_through = true
end, enhance_error)}
\($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
")
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