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4b802d6417
In some cases readline emits a trailing spaces after the last suggestion, which results in errors such as: ``` -( - atan cos exp ln number sin sqrt$ +( - atan cos exp ln number sin sqrt $ ``` Reported by Christopher Nielsen <mascguy@github.com>. <https://trac.macports.org/ticket/59927#comment:48> <https://trac.macports.org/attachment/ticket/59927/bison-3.7.6-test-10.13.test-suite.log> * examples/test (run): Add support for -t. * examples/c/bistromathic/bistromathic.test: Use it.
bistromathic - all the bells and whistles
This example demonstrates best practices when using Bison.
- Its hand-written scanner tracks locations.
- Its interface is pure.
- It uses %params to pass user information to the parser and scanner.
- Its scanner uses the
errortoken to signal lexical errors and enter error recovery. - Its interface is "incremental", well suited for interaction: it uses the push-parser API to feed the parser with the incoming tokens.
- It features an interactive command line with completion based on the
parser state, based on
yyexpected_tokens. - It uses Bison's standard catalog for internationalization of generated messages.
- It uses a custom syntax error with location, lookahead correction and token internationalization.
- Error messages quote the source with squiggles that underline the error:
> 123 456
1.5-7: syntax error: expected end of file or + or - or * or / or ^ before number
1 | 123 456
| ^~~
- It supports debug traces with semantic values.
- It uses named references instead of the traditional $1, $2, etc.
To customize the interaction with bistromathic, see the GNU Readline user
manual (see info rluserman).