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Adding question mark to the sample fails #40

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entrptaher opened this issue May 1, 2023 · 8 comments
Open

Adding question mark to the sample fails #40

entrptaher opened this issue May 1, 2023 · 8 comments
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bug Something isn't working

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@entrptaher
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The following code,

training_file = BeautifulSoup("<p>with a question mark?</p>", features="lxml").prettify()
training_set = TrainingSet()
page = Page(training_file)
sample = Sample(page, {
                'title': 'with a question mark?'})
training_set.add_sample(sample)
scraper = train_scraper(training_set)

Throws error

mlscraper.samples.NoMatchFoundException: No match found on page (self.page=<Page self.soup.name='[document]' classes=None, text=with a que...>, self.value='with a question mark?'

But the following code works just without the question mark in the html,

training_file = BeautifulSoup("<p>with a question mark</p>", features="lxml").prettify()
training_set = TrainingSet()
page = Page(training_file)
sample = Sample(page, {
                'title': 'with a question mark'})
training_set.add_sample(sample)
scraper = train_scraper(training_set)
@entrptaher
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The same file worked with autoscraper without any issue.

@lorey lorey added the bug Something isn't working label May 1, 2023
@lorey
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lorey commented May 1, 2023

Thanks, that's very weird.

  • Which version are you using?
  • since generate_all_value_matches just calls BeautifulSoup's find all in the latest version, I have no answer yet.

@lorey
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lorey commented May 1, 2023

Does the same happen for <html><body><p>what?</p></body></html>?

@lorey lorey added invalid This doesn't seem right and removed bug Something isn't working labels May 1, 2023
@lorey
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lorey commented May 1, 2023

This is how it's meant to be called, not sure what you're trying to achieve.

    training_set = TrainingSet()
    html = "<html><body><p>with a question mark?</p></body></html>"
    page = Page(html)
    sample = Sample(page, {
        'title': 'with a question mark?'})
    training_set.add_sample(sample)
    scraper = train_scraper(training_set)
    print(scraper)

@lorey lorey closed this as completed May 1, 2023
@lorey
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lorey commented May 1, 2023

Prettify creates whitespace that mlscraper currently is sensitive to. I know this is not perfect, but it's on the roadmap.

@lorey
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lorey commented May 1, 2023

Related: #15

@entrptaher
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entrptaher commented May 2, 2023 •
edited

I found the issue here,

    def _generate_find_all(self, item):
        assert isinstance(item, str), "can only search for str at the moment"

        # text
        # - since text matches including whitespace, a regex is used
        target_regex = re.compile(r"^\s*%s\s*$" % html.escape(item))

This generates a wrong regex,

with a question mark?
re.compile('^\\s*with a question mark?\\s*$')

Using re.escape fixes this issue,

    def _generate_find_all(self, item):
        assert isinstance(item, str), "can only search for str at the moment"

        # text
        # - since text matches including whitespace, a regex is used
        target_regex = re.compile(r"^\s*%s\s*$" % html.escape(re.escape(item)))

@lorey
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lorey commented May 2, 2023

Good catch!

@lorey lorey reopened this May 2, 2023
@lorey lorey added bug Something isn't working and removed invalid This doesn't seem right labels May 2, 2023
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@lorey @entrptaher