09552: Lua cheat plugin rejects valid |= compound assignment in XML cheats

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
09552	Plugins	Major	Always	2 days ago	4 hours ago

Tester	Russell	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows (x64)
Status [?]	Acknowledged			Driver
Version	0.289	Fixed in Version		Build	x64
		Fixed in Git Commit		Github Pull Request #

Summary	09552: Lua cheat plugin rejects valid \|= compound assignment in XML cheats
Description	The Lua Cheat plugin cannot load an XML cheat action containing the MAME compound assignment operator like this one \|=. The same XML expression is accepted and executed correctly by MAME's regular built-in cheat engine. However, when the cheat is loaded through the Lua Cheat plugin, a pop-up error is displayed: e.g. <action>maincpu.pb@202A26 \|= 01</action> error cheat script error: "Compound assignment test" [string "Compound assignment testrun"]:1: unexpected symbol near '\|'
Steps To Reproduce	1. Use an official MAME 0.289 2. Enable the Cheat Lua plugin. https://www.mamecheat.co.uk/forums/viewtopic.php?t=14201 3. Place the XML example above in the configured cheat path as metamrph.xml 4. Start the game. 5. Open Plugin Options, then Cheat. 6. Observe the Lua compilation error near '\|'.
Additional Information	The relevant regular-expression implementation is: https://github.com/mamedev/mame/blob/mame0289/src/emu/debug/express.cpp The XML converter that does not currently expand \|= is: https://github.com/mamedev/mame/blob/mame0289/plugins/cheat/cheat_xml.lua Edit: In case it is helpful for investigating this issue, I have posted my modified cheat_xml.lua. The file adds tested conversion support for the complete compound-assignment family and several other commonly used MAME XML expressions and conditions. And sorry about duplicated reports. https://www.mamecheat.co.uk/forums/viewtopic.php?p=29916#p29916
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