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# NEWS for Lrama
## Lrama 0.5.11 (2023-12-02)
### Type specification of parameterizing rules
Allow to specify type of rules by specifying tag, `<i>` in below example.
Tag is post-modification style.
```
%union {
int i;
}
%%
program : option(number) <i>
| number_alias? <i>
;
```
https://github.com/ruby/lrama/pull/272
## Lrama 0.5.10 (2023-11-18)
### Parameterizing rules (option, nonempty_list, list)
Support function call style parameterizing rules for `option`, `nonempty_list` and `list`.
https://github.com/ruby/lrama/pull/197
### Parameterizing rules (separated_list)
Support `separated_list` and `separated_nonempty_list` parameterizing rules.
```
program: separated_list(',', number)
// Expanded to
program: separated_list_number
separated_list_number: ε
separated_list_number: separated_nonempty_list_number
separated_nonempty_list_number: number
separated_nonempty_list_number: separated_nonempty_list_number ',' number
```
```
program: separated_nonempty_list(',', number)
// Expanded to
program: separated_nonempty_list_number
separated_nonempty_list_number: number
separated_nonempty_list_number: separated_nonempty_list_number ',' number
```
https://github.com/ruby/lrama/pull/204
## Lrama 0.5.9 (2023-11-05)
### Parameterizing rules (suffix)
Parameterizing rules are template of rules.
It's very common pattern to write "list" grammar rule like:
```
opt_args: /* none */
| args
;
args: arg
| args arg
```
Lrama supports these suffixes:
* `?`: option
* `+`: nonempty list
* `*`: list
Idea of Parameterizing rules comes from Menhir LR(1) parser generator (https://gallium.inria.fr/~fpottier/menhir/manual.html#sec32).
https://github.com/ruby/lrama/pull/181
## Lrama 0.5.7 (2023-10-23)
### Racc parser
Replace Lrama's parser from hand written parser to LR parser generated by Racc.
Lrama uses `--embedded` option to generate LR parser because Racc is changed from default gem to bundled gem by Ruby 3.3 (https://github.com/ruby/lrama/pull/132).
https://github.com/ruby/lrama/pull/62
## Lrama 0.5.4 (2023-08-17)
### Runtime configuration for error recovery
Meke error recovery function configurable on runtime by two new macros.
* `YYMAXREPAIR`: Expected to return max length of repair operations. `%parse-param` is passed to this function.
* `YYERROR_RECOVERY_ENABLED`: Expected to return bool value to determine error recovery is enabled or not. `%parse-param` is passed to this function.
https://github.com/ruby/lrama/pull/74
## Lrama 0.5.3 (2023-08-05)
### Error Recovery
Support token insert base Error Recovery.
`-e` option is needed to generate parser with error recovery functions.
https://github.com/ruby/lrama/pull/44
## Lrama 0.5.2 (2023-06-14)
### Named References
Instead of positional references like `$1` or `$$`,
named references allow to access to symbol by name.
```
primary: k_class cpath superclass bodystmt k_end
{
$primary = new_class($cpath, $bodystmt, $superclass);
}
```
Alias name can be declared.
```
expr[result]: expr[ex-left] '+' expr[ex.right]
{
$result = $[ex-left] + $[ex.right];
}
```
Bison supports this feature from 2.5.
### Add parse params to some macros and functions
`%parse-param` are added to these macros and functions to remove ytab.sed hack from Ruby.
* `YY_LOCATION_PRINT`
* `YY_SYMBOL_PRINT`
* `yy_stack_print`
* `YY_STACK_PRINT`
* `YY_REDUCE_PRINT`
* `yysyntax_error`
https://github.com/ruby/lrama/pull/40
See also: https://github.com/ruby/ruby/pull/7807
## Lrama 0.5.0 (2023-05-17)
### stdin mode
When `-` is given as grammar file name, reads the grammar source from STDIN, and takes the next argument as the input file name. This mode helps pre-process a grammar source.
https://github.com/ruby/lrama/pull/8
## Lrama 0.4.0 (2023-05-13)
This is the first version migrated to Ruby.
This version generates "parse.c" compatible with Bison 3.8.2.
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