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Path: /opt/cloudlinux/venv/lib/python3.11/site-packages/tap/

Viewing File: parser.py

import itertools
import re
import sys
from io import StringIO

from tap.directive import Directive
from tap.line import Bail, Diagnostic, Plan, Result, Unknown, Version

try:
    import yaml  # noqa
    from more_itertools import peekable

    ENABLE_VERSION_13 = True
except ImportError:  # pragma: no cover
    ENABLE_VERSION_13 = False


class Parser:
    """A parser for TAP files and lines."""

    # ok and not ok share most of the same characteristics.
    result_base = r"""
        \s*                    # Optional whitespace.
        (?P<number>\d*)        # Optional test number.
        \s*                    # Optional whitespace.
        (?P<description>[^#]*) # Optional description before #.
        \#?                    # Optional directive marker.
        \s*                    # Optional whitespace.
        (?P<directive>.*)      # Optional directive text.
    """
    ok = re.compile(r"^ok" + result_base, re.VERBOSE)
    not_ok = re.compile(r"^not\ ok" + result_base, re.VERBOSE)
    plan = re.compile(
        r"""
        ^1..(?P<expected>\d+) # Match the plan details.
        [^#]*                 # Consume any non-hash character to confirm only
                              # directives appear with the plan details.
        \#?                   # Optional directive marker.
        \s*                   # Optional whitespace.
        (?P<directive>.*)     # Optional directive text.
    """,
        re.VERBOSE,
    )
    diagnostic = re.compile(r"^#")
    bail = re.compile(
        r"""
        ^Bail\ out!
        \s*            # Optional whitespace.
        (?P<reason>.*) # Optional reason.
    """,
        re.VERBOSE,
    )
    version = re.compile(r"^TAP version (?P<version>\d+)$")

    yaml_block_start = re.compile(r"^(?P<indent>\s+)-")
    yaml_block_end = re.compile(r"^\s+\.\.\.")

    TAP_MINIMUM_DECLARED_VERSION = 13

    def parse_file(self, filename):
        """Parse a TAP file to an iterable of tap.line.Line objects.

        This is a generator method that will yield an object for each
        parsed line. The file given by `filename` is assumed to exist.
        """
        return self.parse(open(filename))

    def parse_stdin(self):
        """Parse a TAP stream from standard input.

        Note: this has the side effect of closing the standard input
        filehandle after parsing.
        """
        return self.parse(sys.stdin)

    def parse_text(self, text):
        """Parse a string containing one or more lines of TAP output."""
        return self.parse(StringIO(text))

    def parse(self, fh):
        """Generate tap.line.Line objects, given a file-like object `fh`.

        `fh` may be any object that implements both the iterator and
        context management protocol (i.e. it can be used in both a
        "with" statement and a "for...in" statement.)

        Trailing whitespace and newline characters will be automatically
        stripped from the input lines.
        """
        with fh:
            try:
                first_line = next(fh)
            except StopIteration:
                return
            first_parsed = self.parse_line(first_line.rstrip())
            fh_new = itertools.chain([first_line], fh)
            if first_parsed.category == "version" and first_parsed.version >= 13:
                if ENABLE_VERSION_13:
                    fh_new = peekable(itertools.chain([first_line], fh))
                else:  # pragma no cover
                    print(
                        """
WARNING: Optional imports not found, TAP 13 output will be
    ignored. To parse yaml, see requirements in docs:
    https://tappy.readthedocs.io/en/latest/consumers.html#tap-version-13"""
                    )

            for line in fh_new:
                yield self.parse_line(line.rstrip(), fh_new)

    def parse_line(self, text, fh=None):
        """Parse a line into whatever TAP category it belongs."""
        match = self.ok.match(text)
        if match:
            return self._parse_result(True, match, fh)

        match = self.not_ok.match(text)
        if match:
            return self._parse_result(False, match, fh)

        if self.diagnostic.match(text):
            return Diagnostic(text)

        match = self.plan.match(text)
        if match:
            return self._parse_plan(match)

        match = self.bail.match(text)
        if match:
            return Bail(match.group("reason"))

        match = self.version.match(text)
        if match:
            return self._parse_version(match)

        return Unknown()

    def _parse_plan(self, match):
        """Parse a matching plan line."""
        expected_tests = int(match.group("expected"))
        directive = Directive(match.group("directive"))

        # Only SKIP directives are allowed in the plan.
        if directive.text and not directive.skip:
            return Unknown()

        return Plan(expected_tests, directive)

    def _parse_result(self, ok, match, fh=None):
        """Parse a matching result line into a result instance."""
        peek_match = None
        try:
            if fh is not None and ENABLE_VERSION_13 and isinstance(fh, peekable):
                peek_match = self.yaml_block_start.match(fh.peek())
        except StopIteration:
            pass
        if peek_match is None:
            return Result(
                ok,
                number=match.group("number"),
                description=match.group("description").strip(),
                directive=Directive(match.group("directive")),
            )
        indent = peek_match.group("indent")
        concat_yaml = self._extract_yaml_block(indent, fh)
        return Result(
            ok,
            number=match.group("number"),
            description=match.group("description").strip(),
            directive=Directive(match.group("directive")),
            raw_yaml_block=concat_yaml,
        )

    def _extract_yaml_block(self, indent, fh):
        """Extract a raw yaml block from a file handler"""
        raw_yaml = []
        indent_match = re.compile(rf"^{indent}")
        try:
            next(fh)
            while indent_match.match(fh.peek()):
                raw_yaml.append(next(fh).replace(indent, "", 1))
                # check for the end and stop adding yaml if encountered
                if self.yaml_block_end.match(fh.peek()):
                    next(fh)
                    break
        except StopIteration:
            pass
        return "".join(raw_yaml)

    def _parse_version(self, match):
        version = int(match.group("version"))
        if version < self.TAP_MINIMUM_DECLARED_VERSION:
            raise ValueError(
                "It is an error to explicitly specify any version lower than 13."
            )
        return Version(version)
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