# SPDX-License-Identifier: LGPL-2.1-only
# Copyright 2022 Jookia <contact@jookia.org>

from hypothesis import given
from hypothesis.strategies import (
    booleans,
    characters,
    composite,
    just,
    lists,
    sampled_from,
    text,
)

from src import tokenize

# Whitespace that separates lexer words
whitespace = " \n\t"


# Draws a tokenizer non-whitespace symbol
@composite
def draw_symbol_nonwhitespace(draw):
    chars = characters(blacklist_characters=whitespace)
    value = draw(text(alphabet=chars, min_size=1))
    return tokenize.Symbol(value)


# Draws a tokenizer whitespace symbol
@composite
def draw_symbol_whitespace(draw):
    return tokenize.Symbol(draw(sampled_from(whitespace)))


# Generates an alternating sequence of symbols
@composite
def draw_symbols_list(draw):
    output = []
    elements = draw(lists(just(True)))
    drawing_whitespace = draw(booleans())
    for _ in elements:
        if drawing_whitespace:
            strategy = draw_symbol_whitespace()
            output += draw(lists(strategy, min_size=1))
        else:
            strategy = draw_symbol_whitespace()
            output.append(draw(strategy))
        drawing_whitespace = not drawing_whitespace
    return output


# Test that we the tokenizer can split symbols properly
@given(draw_symbols_list())
def test_tokenize_split_symbols(symbols):
    input = ""
    for s in symbols:
        input += s.value
    assert tokenize.split_symbols(input) == symbols