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"""Functions to parse build logs and extract error messages.

This is a python port of the regular expressions CTest uses to parse log
files here:

.. code-block::

   https://github.com/Kitware/CMake/blob/master/Source/CTest/cmCTestBuildHandler.cxx

This file takes the regexes verbatim from there and adds some parsing
algorithms that duplicate the way CTest scrapes log files.  To keep this
up to date with CTest, just make sure the ``*_matches`` and
``*_exceptions`` lists are kept up to date with CTest's build handler.
"""
import io
import math
import multiprocessing
import re
import sys
import threading
import time
from contextlib import contextmanager
from typing import List, Optional, TextIO, Tuple, Union

_error_matches = [
    "^FAIL: ",
    "^FATAL: ",
    "^failed ",
    "FAILED",
    "Failed test",
    "^[Bb]us [Ee]rror",
    "^[Ss]egmentation [Vv]iolation",
    "^[Ss]egmentation [Ff]ault",
    ":.*[Pp]ermission [Dd]enied",
    "[^ :]:[0-9]+: [^ \\t]",
    "[^:]: error[ \\t]*[0-9]+[ \\t]*:",
    "^Error ([0-9]+):",
    "^Fatal",
    "^[Ee]rror: ",
    "^Error ",
    "[0-9] ERROR: ",
    '^"[^"]+", line [0-9]+: [^Ww]',
    "^cc[^C]*CC: ERROR File = ([^,]+), Line = ([0-9]+)",
    "^ld([^:])*:([ \\t])*ERROR([^:])*:",
    "^ild:([ \\t])*\\(undefined symbol\\)",
    "[^ :] : (error|fatal error|catastrophic error)",
    "[^:]: (Error:|error|undefined reference|multiply defined)",
    "[^:]\\([^\\)]+\\) ?: (error|fatal error|catastrophic error)",
    "^fatal error C[0-9]+:",
    ": syntax error ",
    "^collect2: ld returned 1 exit status",
    "ld terminated with signal",
    "Unsatisfied symbol",
    "^Unresolved:",
    "Undefined symbol",
    "^Undefined[ \\t]+first referenced",
    "^CMake Error",
    ":[ \\t]cannot find",
    ":[ \\t]can't find",
    ": \\*\\*\\* No rule to make target [`'].*\\'.  Stop",
    ": \\*\\*\\* No targets specified and no makefile found",
    ": Invalid loader fixup for symbol",
    ": Invalid fixups exist",
    ": Can't find library for",
    ": internal link edit command failed",
    ": Unrecognized option [`'].*\\'",
    '", line [0-9]+\\.[0-9]+: [0-9]+-[0-9]+ \\([^WI]\\)',
    "ld: 0706-006 Cannot find or open library file: -l ",
    "ild: \\(argument error\\) can't find library argument ::",
    "^could not be found and will not be loaded.",
    "^WARNING: '.*' is missing on your system",
    "s:616 string too big",
    "make: Fatal error: ",
    "ld: 0711-993 Error occurred while writing to the output file:",
    "ld: fatal: ",
    "final link failed:",
    "make: \\*\\*\\*.*Error",
    "make\\[.*\\]: \\*\\*\\*.*Error",
    "\\*\\*\\* Error code",
    "nternal error:",
    "Makefile:[0-9]+: \\*\\*\\* .*  Stop\\.",
    ": No such file or directory",
    ": Invalid argument",
    "^The project cannot be built\\.",
    "^\\[ERROR\\]",
    "^Command .* failed with exit code",
]

_error_exceptions = [
    "instantiated from ",
    "candidates are:",
    ": warning",
    ": WARNING",
    ": \\(Warning\\)",
    ": note",
    "    ok",
    "Note:",
    ":[ \\t]+Where:",
    "[^ :]:[0-9]+: Warning",
    "------ Build started: .* ------",
]

#: Regexes to match file/line numbers in error/warning messages
_warning_matches = [
    "[^ :]:[0-9]+: warning:",
    "[^ :]:[0-9]+: note:",
    "^cc[^C]*CC: WARNING File = ([^,]+), Line = ([0-9]+)",
    "^ld([^:])*:([ \\t])*WARNING([^:])*:",
    "[^:]: warning [0-9]+:",
    '^"[^"]+", line [0-9]+: [Ww](arning|arnung)',
    "[^:]: warning[ \\t]*[0-9]+[ \\t]*:",
    "^(Warning|Warnung) ([0-9]+):",
    "^(Warning|Warnung)[ :]",
    "WARNING: ",
    "[^ :] : warning",
    "[^:]: warning",
    '", line [0-9]+\\.[0-9]+: [0-9]+-[0-9]+ \\([WI]\\)',
    "^cxx: Warning:",
    "file: .* has no symbols",
    "[^ :]:[0-9]+: (Warning|Warnung)",
    "\\([0-9]*\\): remark #[0-9]*",
    '".*", line [0-9]+: remark\\([0-9]*\\):',
    "cc-[0-9]* CC: REMARK File = .*, Line = [0-9]*",
    "^CMake Warning",
    "^\\[WARNING\\]",
]

#: Regexes to match file/line numbers in error/warning messages
_warning_exceptions = [
    "/usr/.*/X11/Xlib\\.h:[0-9]+: war.*: ANSI C\\+\\+ forbids declaration",
    "/usr/.*/X11/Xutil\\.h:[0-9]+: war.*: ANSI C\\+\\+ forbids declaration",
    "/usr/.*/X11/XResource\\.h:[0-9]+: war.*: ANSI C\\+\\+ forbids declaration",
    "WARNING 84 :",
    "WARNING 47 :",
    "warning:  Clock skew detected.  Your build may be incomplete.",
    "/usr/openwin/include/GL/[^:]+:",
    "bind_at_load",
    "XrmQGetResource",
    "IceFlush",
    "warning LNK4089: all references to [^ \\t]+ discarded by .OPT:REF",
    "ld32: WARNING 85: definition of dataKey in",
    'cc: warning 422: Unknown option "\\+b',
    "_with_warning_C",
]

#: Regexes to match file/line numbers in error/warning messages
_file_line_matches = [
    "^Warning W[0-9]+ ([a-zA-Z.\\:/0-9_+ ~-]+) ([0-9]+):",
    "^([a-zA-Z./0-9_+ ~-]+):([0-9]+):",
    "^([a-zA-Z.\\:/0-9_+ ~-]+)\\(([0-9]+)\\)",
    "^[0-9]+>([a-zA-Z.\\:/0-9_+ ~-]+)\\(([0-9]+)\\)",
    "^([a-zA-Z./0-9_+ ~-]+)\\(([0-9]+)\\)",
    '"([a-zA-Z./0-9_+ ~-]+)", line ([0-9]+)',
    "File = ([a-zA-Z./0-9_+ ~-]+), Line = ([0-9]+)",
]


class LogEvent:
    """Class representing interesting events (e.g., errors) in a build log."""

    def __init__(
        self,
        text,
        line_no,
        source_file=None,
        source_line_no=None,
        pre_context=None,
        post_context=None,
    ):
        self.text = text
        self.line_no = line_no
        self.source_file = (source_file,)
        self.source_line_no = (source_line_no,)
        self.pre_context = pre_context if pre_context is not None else []
        self.post_context = post_context if post_context is not None else []
        self.repeat_count = 0

    @property
    def start(self):
        """First line in the log with text for the event or its context."""
        return self.line_no - len(self.pre_context)

    @property
    def end(self):
        """Last line in the log with text for event or its context."""
        return self.line_no + len(self.post_context) + 1

    def __getitem__(self, line_no):
        """Index event text and context by actual line number in file."""
        if line_no == self.line_no:
            return self.text
        elif line_no < self.line_no:
            return self.pre_context[line_no - self.line_no]
        elif line_no > self.line_no:
            return self.post_context[line_no - self.line_no - 1]

    def __str__(self):
        """Returns event lines and context."""
        out = io.StringIO()
        for i in range(self.start, self.end):
            if i == self.line_no:
                out.write("  >> %-6d%s" % (i, self[i]))
            else:
                out.write("     %-6d%s" % (i, self[i]))
        return out.getvalue()


class BuildError(LogEvent):
    """LogEvent subclass for build errors."""


class BuildWarning(LogEvent):
    """LogEvent subclass for build warnings."""


def chunks(xs, n):
    """Divide xs into n approximately-even chunks."""
    chunksize = int(math.ceil(len(xs) / n))
    return [xs[i : i + chunksize] for i in range(0, len(xs), chunksize)]


@contextmanager
def _time(times, i):
    start = time.time()
    yield
    end = time.time()
    times[i] += end - start


def _match(matches, exceptions, line):
    """True if line matches a regex in matches and none in exceptions."""
    return any(m.search(line) for m in matches) and not any(e.search(line) for e in exceptions)


def _profile_match(matches, exceptions, line, match_times, exc_times):
    """Profiled version of match().

    Timing is expensive so we have two whole functions.  This is much
    longer because we have to break up the ``any()`` calls.

    """
    for i, m in enumerate(matches):
        with _time(match_times, i):
            if m.search(line):
                break
    else:
        return False

    for i, m in enumerate(exceptions):
        with _time(exc_times, i):
            if m.search(line):
                return False
    else:
        return True


def _parse(lines, offset, profile):
    def compile(regex_array):
        return [re.compile(regex) for regex in regex_array]

    error_matches = compile(_error_matches)
    error_exceptions = compile(_error_exceptions)
    warning_matches = compile(_warning_matches)
    warning_exceptions = compile(_warning_exceptions)
    file_line_matches = compile(_file_line_matches)

    matcher, _ = _match, []
    timings = []
    if profile:
        matcher = _profile_match
        timings = [
            [0.0] * len(error_matches),
            [0.0] * len(error_exceptions),
            [0.0] * len(warning_matches),
            [0.0] * len(warning_exceptions),
        ]

    errors = []
    warnings = []
    for i, line in enumerate(lines):
        # use CTest's regular expressions to scrape the log for events
        if matcher(error_matches, error_exceptions, line, *timings[:2]):
            event = BuildError(line.strip(), offset + i + 1)
            errors.append(event)
        elif matcher(warning_matches, warning_exceptions, line, *timings[2:]):
            event = BuildWarning(line.strip(), offset + i + 1)
            warnings.append(event)
        else:
            continue

        # get file/line number for each event, if possible
        for flm in file_line_matches:
            match = flm.search(line)
            if match:
                event.source_file, event.source_line_no = match.groups()

    return errors, warnings, timings


def _parse_unpack(args):
    return _parse(*args)


class CTestLogParser:
    """Log file parser that extracts errors and warnings."""

    def __init__(self, profile=False):
        # whether to record timing information
        self.timings = []
        self.profile = profile

    def print_timings(self):
        """Print out profile of time spent in different regular expressions."""

        def stringify(elt):
            return elt if isinstance(elt, str) else elt.pattern

        index = 0
        for name, arr in [
            ("error_matches", _error_matches),
            ("error_exceptions", _error_exceptions),
            ("warning_matches", _warning_matches),
            ("warning_exceptions", _warning_exceptions),
        ]:

            print()
            print(name)
            for i, elt in enumerate(arr):
                print("%16.2f        %s" % (self.timings[index][i] * 1e6, stringify(elt)))
            index += 1

    def parse(
        self, stream: Union[str, TextIO], context: int = 6, jobs: Optional[int] = None
    ) -> Tuple[List[BuildError], List[BuildWarning]]:
        """Parse a log file by searching each line for errors and warnings.

        Args:
            stream: filename or stream to read from
            context: lines of context to extract around each log event

        Returns:
            two lists containing :class:`BuildError` and :class:`BuildWarning` objects.
        """
        if isinstance(stream, str):
            with open(stream) as f:
                return self.parse(f, context, jobs)

        lines = [line for line in stream]

        if jobs is None:
            jobs = multiprocessing.cpu_count()

        # single-thread small logs
        if len(lines) < 10 * jobs:
            errors, warnings, self.timings = _parse(lines, 0, self.profile)

        else:
            # Build arguments for parallel jobs
            args = []
            offset = 0
            for chunk in chunks(lines, jobs):
                args.append((chunk, offset, self.profile))
                offset += len(chunk)

            # create a pool and farm out the matching job
            pool = multiprocessing.Pool(jobs)
            try:
                # this is a workaround for a Python bug in Pool with ctrl-C
                if sys.version_info >= (3, 2):
                    max_timeout = threading.TIMEOUT_MAX
                else:
                    max_timeout = 9999999
                results = pool.map_async(_parse_unpack, args, 1).get(max_timeout)

                errors, warnings, timings = zip(*results)
            finally:
                pool.terminate()

            # merge results
            errors = sum(errors, [])
            warnings = sum(warnings, [])

            if self.profile:
                self.timings = [[sum(i) for i in zip(*t)] for t in zip(*timings)]

        # add log context to all events
        for event in errors + warnings:
            i = event.line_no - 1
            event.pre_context = [x.rstrip() for x in lines[i - context : i]]
            event.post_context = [x.rstrip() for x in lines[i + 1 : i + context + 1]]

        return errors, warnings
