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tqt.py
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tqt.py
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#!/usr/bin/env python3
"""Text Query Tool (TQT).
TQT implements safe and simple version of some text filtering shell scripts' commands.
It is safe and uniform kind of cat, cut, grep and sed calls and regex handling on the quality level and regex
instruction set of Perl/Python (Perl-compatible regular expressions (PCREs)).
"""
import argparse
import fileinput
import os
import re
import sys
PROG = "tqt.py"
VERSION = "1.1"
class Cat:
"""Concatenate stdin and files and print on the standard output."""
def __init__(self, files=None) -> None:
"""[TODO summary].
Args:
files ([type], optional): [description]. Defaults to None.
"""
if files:
for path in files:
if not os.path.isfile(path):
raise FileNotFoundError(f"File {path} does not exist.")
self.files = files
def concatenate(self) -> None:
"""[TODO summary]."""
for line in fileinput.input(files=self.files):
print(line.rstrip())
class Cut(Cat):
"""[TODO summary].
Args:
Cat ([type]): [description]
"""
def __init__(self, files=None, delimiter="\t", fields="0,-1") -> None:
r"""[TODO summary].
Args:
files ([type], optional): [description]. Defaults to None.
delimiter (str, optional): [description]. Defaults to "\t".
fields (str, optional): [description]. Defaults to "0,-1".
"""
super().__init__(files)
self.delimiter = delimiter
if not re.match(r"^(None|\d*),(None|\d*)$", fields):
raise SyntaxError("FIELDS syntax must be <N,M>; where N,M can be nothing, integer, or None.")
self.fields = fields.split(",")
def select(self) -> None:
"""[TODO summary].
First element index: 0
Last element index: None
Element before last index: -1; and so on.
"""
for line in fileinput.input(files=self.files):
line = line.rstrip()
field_values = re.split(self.delimiter, line)
first, last = self.fields
if first == "" or first == "None":
first = None
else:
first = int(first)
if last == "" or last == "None":
last = None
else:
last = int(last)
print(self.delimiter.join(field_values[first:last]))
class Grep(Cat):
"""[TODO summary].
Args:
Cat ([type]): [description]
"""
def __init__(self, files=None, lines="0,-1", regexes=None) -> None:
"""[TODO summary].
Args:
files ([type], optional): [description]. Defaults to None.
lines (str, optional): [description]. Defaults to "0,-1".
regexes ([type], optional): [description]. Defaults to None.
"""
super().__init__(files)
if lines:
if not re.match(r"^(None|\d*),(None|\d*)$", lines):
raise SyntaxError("LINES syntax must be <N,M>; where N,M can be nothing, integer, or None.")
self.lines = lines
self.regexes = regexes
def search(self) -> None:
"""[TODO summary]."""
for i, line in enumerate(fileinput.input(files=self.files)):
line = line.rstrip()
in_lines = None
if self.lines:
in_lines = self.lines.split(",")
if in_lines and i < int(in_lines[0]):
continue
if in_lines and in_lines[1] != "-1" and i > int(in_lines[1]): # TODO test this
break
for regex in self.regexes:
if re.search(fr"{regex}", line):
print(line)
break
class Sed(Grep):
"""[TODO summary].
Args:
Grep ([type]): [description]
"""
def __init__(self, files=None, lines="0,-1", regexes=None, replacements=None, insert=None, append=None, deletion=None) -> None:
"""[TODO summary].
Args:
files ([type], optional): [description]. Defaults to None.
lines (str, optional): [description]. Defaults to "0,-1".
regexes ([type], optional): [description]. Defaults to None.
replacements ([type], optional): [description]. Defaults to None.
insert ([type], optional): [description]. Defaults to None.
append ([type], optional): [description]. Defaults to None.
deletion ([type], optional): [description]. Defaults to None.
"""
super().__init__(files, lines, regexes)
if len(regexes) != len(replacements):
raise IndexError("Number of EXPRESSION(s) and SUBSITUTE(s) must be the same.")
self.regexes = regexes
self.replacements = replacements
self.insert = insert
self.append = append
self.deletion = deletion
def _replace(self) -> None:
for line in fileinput.input(files=self.files):
line = line.rstrip()
from_to = tuple(zip(self.regexes, self.replacements))
for pattern, repl in from_to:
if re.search(fr"{pattern}", line):
print(re.sub(fr"{pattern}", repl, line))
else:
print(line)
def _delete(self) -> None:
for line in fileinput.input(files=self.files):
line = line.rstrip()
if any([re.search(fr"{regex}", line) for regex in self.regexes]):
print(line)
def _insert(self) -> None:
# TODO
print("Not implemented.")
def _append(self) -> None:
# TODO
print("Not implemented.")
def edit(self) -> None:
"""[TODO summary]."""
if self.deletion:
self._delete()
elif self.replacements:
self._replace()
elif self.append:
self._append()
elif self.insert:
self._insert()
if __name__ == "__main__":
main_group = argparse.ArgumentParser(prog=PROG, description=__doc__)
main_group.add_argument("-V", "--version", action="version", version=f"%(prog)s {VERSION}")
main_group.add_argument("command", help="command to be executed", choices=["cat", "cut", "grep", "sed"])
main_group.add_argument("-f", "--file", action="extend", nargs="+", help="add file(s) to be examined (default: stdin)")
main_group.add_argument("-l", "--lines", help="select LINES range <N,M> [0,-1]")
main_group.add_argument("-e", "--expression", action="extend", nargs="+", help="select regex EXPRESSION(s) matching")
cut_group = main_group.add_argument_group("cut arguments")
cut_group.add_argument("-D", "--delimiter", help="set regex DELIMITER for field separation")
cut_group.add_argument("-F", "--fields", help="select FIELDS <N,M> [0,-1]")
grep_group = main_group.add_argument_group("grep arguments")
grep_group.add_argument("-c", "--ignore-case", action="store_true", help="ignore case distinctions")
grep_group.add_argument("-v", "--invert-match", action="store_true", help="select non-matching lines")
sed_group = main_group.add_argument_group("sed arguments")
sed_options = sed_group.add_mutually_exclusive_group()
sed_options.add_argument("-s", "--substitute", action="extend", nargs="+", help="replace to SUBSITUTE(s)")
sed_options.add_argument("-i", "--insert", help="insert INSERT string before")
sed_options.add_argument("-a", "--append", help="append APPEND string after")
sed_options.add_argument("-d", "--delete", action="store_true", help="delete selected lines")
args = main_group.parse_args()
sys.argv.remove(args.command)
if args.command == "cat":
Cat(args.file).concatenate()
elif args.command == "cut":
Cut(args.file, args.delimiter, args.fields).select()
elif args.command == "grep":
Grep(args.file, args.lines, args.expression).search()
elif args.command == "sed":
Sed(args.file, args.lines, args.expression, args.substitute, args.insert, args.append, args.delete).edit()