#!/usr/bin/python3

# The MIT License (MIT)
#
# Copyright © 2020-2025 pacman64
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the “Software”), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.


info = '''
minitl [options...] [python expression] [files/URIs...]

This is the MINImal version of the Transform Lines tool.
'''


from json import dumps, loads
from sys import argv, exit, stderr, stdin
from typing import Generator


if len(argv) < 2:
    print(info.strip(), file=stderr)
    exit(0)
if len(argv) == 2 and argv[1] in ('-h', '--h', '-help', '--help'):
    print(info.strip())
    exit(0)


def handle_no_input(expr):
    res = eval(expr)
    if isinstance(res, (list, range, tuple, Generator)):
        for e in res:
            if not isinstance(e, Skip):
                print(e, flush=True)
        return

    res = adapt_result(res, None)
    if not (res is None):
        print(res, flush=True)


def handle_lines(src, expr):
    # `comprehension` expressions seem to ignore local variables: even
    # lambda-based workarounds fail
    global i, l, line, v, val, value, e, err, error

    i = 0
    e = err = error = None

    for l in src:
        l = l.rstrip('\r\n').rstrip('\n')
        if i == 0:
            l = l.lstrip('\xef\xbb\xbf')

        line = l
        try:
            e = err = error = None
            v = val = value = loads(l)
        except Exception as ex:
            e = err = error = ex
            v = val = value = Skip()
        res = eval(expr)
        i += 1

        if isinstance(res, (list, range, tuple, Generator)):
            for e in res:
                if not isinstance(e, Skip):
                    print(e, flush=True)
            continue

        res = adapt_result(res, line)
        if not (res is None):
            print(res, flush=True)


def hold_lines(src, lines):
    for e in src:
        lines.append(e)
        yield e


def adapt_result(res, fallback):
    if isinstance(res, BaseException):
        raise res
    if isinstance(res, Skip):
        return res
    if res is None or res is False:
        return None
    if callable(res):
        return res(fallback)
    if res is True:
        return fallback
    if isinstance(res, dict):
        return dumps(res, allow_nan=False)
    return str(res)


class Skip:
    pass


skip = Skip()


def rescue(attempt, fallback = None):
    try:
        return attempt()
    except Exception as e:
        if callable(fallback):
            return fallback(e)
        return fallback

catch = rescue
catched = rescue
caught = rescue
recover = rescue
recovered = rescue
rescued = rescue


def make_open_utf8(open):
    def open_utf8_readonly(path):
        return open(path, encoding='utf-8')
    return open_utf8_readonly


def seems_url(path):
    protocols = ('https://', 'http://', 'file://', 'ftp://', 'data:')
    return any(path.startswith(p) for p in protocols)


cr = '\r'
crlf = '\r\n'
dquo = '"'
dquote = '"'
empty = ''
lcurly = '{'
lf = '\n'
rcurly = '}'
s = ''
squo = '\''
squote = '\''
utf8bom = '\xef\xbb\xbf'

nil = None
none = None
null = None


exec = None
open_utf8 = make_open_utf8(open)
open = open_utf8

no_input_opts = (
    '=', '--n', '-nil', '--nil', '-none', '--none', '-null', '--null',
)
more_modules_opts = ('-mm', '--mm', '-more', '--more')

args = argv[1:]
if any(seems_url(e) for e in args):
    from io import TextIOWrapper
    from urllib.request import urlopen

no_input = False
while len(args) > 0:
    if args[0] in no_input_opts:
        no_input = True
        args = args[1:]
        continue

    if args[0] in more_modules_opts:
        import functools
        import itertools
        import math
        import random
        import statistics
        import string
        import time
        args = args[1:]
        continue

    break


try:
    expr = '.'
    if len(args) > 0:
        expr = args[0]
        args = args[1:]

    # if expr in globals().keys():
    #     v = globals().get(expr)
    #     if callable(v):
    #         expr = f'{expr}(line)'

    if expr == '.' and no_input:
        print(info.strip(), file=stderr)
        exit(0)

    if expr == '.':
        expr = 'line'
    expr = compile(expr, expr, 'eval')

    if no_input:
        handle_no_input(expr)
        exit(0)

    if len(args) == 0:
        handle_lines(stdin, expr)
        exit(0)

    got_stdin = False
    all_stdin = None
    dashes = args.count('-')

    for path in args:
        if path == '-':
            if dashes > 1:
                if not got_stdin:
                    handle_lines(hold_lines(stdin, all_stdin), expr)
                    got_stdin = True
                else:
                    handle_lines(all_stdin, expr)
            else:
                handle_lines(stdin, expr)
            continue

        if seems_url(path):
            with urlopen(path) as inp:
                with TextIOWrapper(inp, encoding='utf-8') as txt:
                    handle_lines(txt, expr)
            continue

        with open_utf8(path) as txt:
            handle_lines(txt, expr)
except BrokenPipeError:
    # quit quietly, instead of showing a confusing error message
    stderr.close()
    exit(0)
except KeyboardInterrupt:
    exit(2)
except Exception as e:
    print(f'\x1b[31m{str(e)}\x1b[0m', file=stderr)
    exit(1)