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#!/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 ("
at_1_fail(\(quote (this tree).source), 'Failure: \(
"'..\($msg as lua expr)" if $msg else "A failure was triggered here'"
))
")
(assume $condition) compiles to ("
if not \($condition as lua expr) then
at_1_fail(\(quote "\($condition.source)"), "Assumption failed: This was 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 was "..tostring(_a).." but it was expected 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 was "..tostring(_a).." but it wasn't expected 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 = {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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