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How can I express `add value [value ...]` in a grammar compile? #953

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laixintao opened this issue Aug 10, 2019 · 0 comments

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@laixintao
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commented Aug 10, 2019

Hi, I want to write a grammar like add value [value ...], for example:

add 1 2 3
add 1 2
add 10 11 12 13

All should be valid grammar.

Is it possible to do this in prompt_toolkit.contrib.regular_languages.compiler.compile? I tried everything but I can't figure it out. I tried with the grammar (\s* (?P<operator1>add) (\s+(?P<var1>[0-9.]+))+ \s*)

Here is the example I tried:

from prompt_toolkit import prompt
from prompt_toolkit.completion import WordCompleter
from prompt_toolkit.contrib.regular_languages.compiler import compile
from prompt_toolkit.contrib.regular_languages.completion import (
    GrammarCompleter,
)
from prompt_toolkit.contrib.regular_languages.lexer import GrammarLexer
from prompt_toolkit.lexers import SimpleLexer
from prompt_toolkit.styles import Style

operators1 = ['add']


def create_grammar():
    return compile(r"""
        (\s*  (?P<operator1>add)   (\s+(?P<var1>[0-9.]+))+    \s*)
    """)


example_style = Style.from_dict({
    'operator':       '#33aa33 bold',
    'number':         '#ff0000 bold',

    'trailing-input': 'bg:#662222 #ffffff',
})


if __name__ == '__main__':
    g = create_grammar()

    lexer = GrammarLexer(g, lexers={
        'operator1': SimpleLexer('class:operator'),
        'var1': SimpleLexer('class:number'),
    })

    completer = GrammarCompleter(g, {
        'operator1': WordCompleter(operators1),
    })

    # REPL loop.
    while True:
        # Read input and parse the result.
        text = prompt('Calculate: ', lexer=lexer, completer=completer,
                      style=example_style)
        m = g.match(text)
        if m:
            vars = m.variables()
        else:
            print('Invalid command\n')
            continue

        print(vars)

It seems that it can only recognize the last var1:

image

Many thanks.

@jonathanslenders

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