Update README

This commit is contained in:
yhirose 2022-09-01 20:43:32 -04:00
parent 8e845201a8
commit ef792116aa

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@ -597,6 +597,27 @@ sample.java:8:6: invalid statement
As you can see, it can now show more than one error, and provide more meaningful error messages than the default messages.
### Custom error message for definitions
We can associate custom error messages to definitions.
```peg
# custom_message.peg
START <- CODE (',' CODE)*
CODE <- < '0x' [a-fA-F0-9]+ > { error_message 'code format error...' }
%whitespace <- [ \t]*
```
```
> cat custom_message.txt
0x1234,0x@@@@,0xABCD
> peglint custom_message.peg custom_message.txt
custom_message.txt:1:8: code format error...
```
NOTE: If there are more than one elements with error message instruction in a prioritized choice, this feature may not work as you expect.
peglint - PEG syntax lint utility
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