mirror of
https://github.com/mikf/gallery-dl.git
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434 lines
12 KiB
Python
434 lines
12 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2021-2023 Mike Fährmann
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2 as
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# published by the Free Software Foundation.
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"""String formatters"""
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import os
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import time
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import string
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import _string
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import datetime
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import operator
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from . import text, util
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NONE = util.NONE
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def parse(format_string, default=NONE, fmt=format):
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key = format_string, default, fmt
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try:
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return _CACHE[key]
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except KeyError:
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pass
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cls = StringFormatter
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if format_string.startswith("\f"):
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kind, _, format_string = format_string.partition(" ")
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kind = kind[1:]
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if kind == "T":
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cls = TemplateFormatter
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elif kind == "TF":
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cls = TemplateFStringFormatter
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elif kind == "E":
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cls = ExpressionFormatter
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elif kind == "M":
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cls = ModuleFormatter
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elif kind == "F":
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cls = FStringFormatter
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formatter = _CACHE[key] = cls(format_string, default, fmt)
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return formatter
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class StringFormatter():
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"""Custom, extended version of string.Formatter
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This string formatter implementation is a mostly performance-optimized
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variant of the original string.Formatter class. Unnecessary features have
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been removed (positional arguments, unused argument check) and new
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formatting options have been added.
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Extra Conversions:
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- "l": calls str.lower on the target value
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- "u": calls str.upper
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- "c": calls str.capitalize
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- "C": calls string.capwords
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- "g": calls text.slugify()
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- "j": calls json.dumps
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- "t": calls str.strip
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- "T": calls util.datetime_to_timestamp_string()
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- "d": calls text.parse_timestamp
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- "s": calls str()
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- "S": calls util.to_string()
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- "U": calls urllib.parse.unescape
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- "r": calls repr()
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- "a": calls ascii()
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- Example: {f!l} -> "example"; {f!u} -> "EXAMPLE"
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# Go to _CONVERSIONS and _SPECIFIERS below to se all of them, read:
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# https://github.com/mikf/gallery-dl/blob/master/docs/formatting.md
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Extra Format Specifiers:
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- "?<before>/<after>/":
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Adds <before> and <after> to the actual value if it evaluates to True.
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Otherwise the whole replacement field becomes an empty string.
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Example: {f:?-+/+-/} -> "-+Example+-" (if "f" contains "Example")
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-> "" (if "f" is None, 0, "")
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- "L<maxlen>/<replacement>/":
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Replaces the output with <replacement> if its length (in characters)
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exceeds <maxlen>. Otherwise everything is left as is.
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Example: {f:L5/too long/} -> "foo" (if "f" is "foo")
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-> "too long" (if "f" is "foobar")
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- "J<separator>/":
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Joins elements of a list (or string) using <separator>
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Example: {f:J - /} -> "a - b - c" (if "f" is ["a", "b", "c"])
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- "R<old>/<new>/":
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Replaces all occurrences of <old> with <new>
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Example: {f:R /_/} -> "f_o_o_b_a_r" (if "f" is "f o o b a r")
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"""
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def __init__(self, format_string, default=NONE, fmt=format):
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self.default = default
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self.format = fmt
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self.result = []
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self.fields = []
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for literal_text, field_name, format_spec, conv in \
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_string.formatter_parser(format_string):
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if literal_text:
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self.result.append(literal_text)
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if field_name:
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self.fields.append((
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len(self.result),
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self._field_access(field_name, format_spec, conv),
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))
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self.result.append("")
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if len(self.result) == 1:
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if self.fields:
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self.format_map = self.fields[0][1]
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else:
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self.format_map = lambda _: format_string
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del self.result, self.fields
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def format_map(self, kwdict):
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"""Apply 'kwdict' to the initial format_string and return its result"""
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result = self.result
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for index, func in self.fields:
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result[index] = func(kwdict)
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return "".join(result)
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def _field_access(self, field_name, format_spec, conversion):
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fmt = self._parse_format_spec(format_spec, conversion)
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if "|" in field_name:
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return self._apply_list([
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parse_field_name(fn)
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for fn in field_name.split("|")
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], fmt)
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else:
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key, funcs = parse_field_name(field_name)
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if key in _GLOBALS:
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return self._apply_globals(_GLOBALS[key], funcs, fmt)
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if funcs:
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return self._apply(key, funcs, fmt)
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return self._apply_simple(key, fmt)
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def _apply(self, key, funcs, fmt):
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def wrap(kwdict):
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try:
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obj = kwdict[key]
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for func in funcs:
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obj = func(obj)
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except Exception:
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obj = self.default
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return fmt(obj)
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return wrap
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def _apply_globals(self, gobj, funcs, fmt):
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def wrap(_):
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try:
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obj = gobj()
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for func in funcs:
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obj = func(obj)
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except Exception:
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obj = self.default
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return fmt(obj)
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return wrap
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def _apply_simple(self, key, fmt):
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def wrap(kwdict):
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return fmt(kwdict[key] if key in kwdict else self.default)
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return wrap
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def _apply_list(self, lst, fmt):
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def wrap(kwdict):
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for key, funcs in lst:
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try:
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obj = _GLOBALS[key]() if key in _GLOBALS else kwdict[key]
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for func in funcs:
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obj = func(obj)
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if obj:
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break
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except Exception:
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pass
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else:
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obj = self.default
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return fmt(obj)
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return wrap
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def _parse_format_spec(self, format_spec, conversion):
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fmt = _build_format_func(format_spec, self.format)
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if not conversion:
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return fmt
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conversion = _CONVERSIONS[conversion]
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if fmt is self.format:
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return conversion
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else:
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return lambda obj: fmt(conversion(obj))
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class ExpressionFormatter():
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"""Generate text by evaluating a Python expression"""
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def __init__(self, expression, default=NONE, fmt=None):
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self.format_map = util.compile_expression(expression)
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class ModuleFormatter():
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"""Generate text by calling an external function"""
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def __init__(self, function_spec, default=NONE, fmt=None):
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module_name, _, function_name = function_spec.partition(":")
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module = util.import_file(module_name)
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self.format_map = getattr(module, function_name)
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class FStringFormatter():
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"""Generate text by evaluating an f-string literal"""
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def __init__(self, fstring, default=NONE, fmt=None):
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self.format_map = util.compile_expression('f"""' + fstring + '"""')
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class TemplateFormatter(StringFormatter):
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"""Read format_string from file"""
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def __init__(self, path, default=NONE, fmt=format):
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with open(util.expand_path(path)) as fp:
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format_string = fp.read()
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StringFormatter.__init__(self, format_string, default, fmt)
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class TemplateFStringFormatter(FStringFormatter):
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"""Read f-string from file"""
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def __init__(self, path, default=NONE, fmt=format):
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with open(util.expand_path(path)) as fp:
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format_string = fp.read()
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FStringFormatter.__init__(self, format_string, default, fmt)
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def parse_field_name(field_name):
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first, rest = _string.formatter_field_name_split(field_name)
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funcs = []
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if first[0] == "'":
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funcs.append(operator.itemgetter(first[1:-1]))
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first = "_lit"
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for is_attr, key in rest:
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if is_attr:
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func = operator.attrgetter
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else:
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func = operator.itemgetter
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try:
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if ":" in key:
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key = _slice(key)
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else:
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key = key.strip("\"'")
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except TypeError:
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pass # key is an integer
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funcs.append(func(key))
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return first, funcs
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def _slice(indices):
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start, _, stop = indices.partition(":")
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stop, _, step = stop.partition(":")
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return slice(
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int(start) if start else None,
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int(stop) if stop else None,
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int(step) if step else None,
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)
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def _build_format_func(format_spec, default):
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if format_spec:
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return _FORMAT_SPECIFIERS.get(
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format_spec[0], _default_format)(format_spec, default)
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return default
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def _parse_optional(format_spec, default):
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before, after, format_spec = format_spec.split(_SEPARATOR, 2)
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before = before[1:]
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fmt = _build_format_func(format_spec, default)
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def optional(obj):
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return before + fmt(obj) + after if obj else ""
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return optional
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def _parse_slice(format_spec, default):
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indices, _, format_spec = format_spec.partition("]")
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slice = _slice(indices[1:])
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fmt = _build_format_func(format_spec, default)
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def apply_slice(obj):
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return fmt(obj[slice])
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return apply_slice
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def _parse_maxlen(format_spec, default):
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maxlen, replacement, format_spec = format_spec.split(_SEPARATOR, 2)
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maxlen = text.parse_int(maxlen[1:])
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fmt = _build_format_func(format_spec, default)
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def mlen(obj):
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obj = fmt(obj)
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return obj if len(obj) <= maxlen else replacement
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return mlen
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def _parse_join(format_spec, default):
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separator, _, format_spec = format_spec.partition(_SEPARATOR)
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join = separator[1:].join
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fmt = _build_format_func(format_spec, default)
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def apply_join(obj):
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if isinstance(obj, str):
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return fmt(obj)
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return fmt(join(obj))
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return apply_join
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def _parse_replace(format_spec, default):
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old, new, format_spec = format_spec.split(_SEPARATOR, 2)
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old = old[1:]
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fmt = _build_format_func(format_spec, default)
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def replace(obj):
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return fmt(obj.replace(old, new))
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return replace
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def _parse_datetime(format_spec, default):
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dt_format, _, format_spec = format_spec.partition(_SEPARATOR)
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dt_format = dt_format[1:]
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fmt = _build_format_func(format_spec, default)
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def dt(obj):
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return fmt(text.parse_datetime(obj, dt_format))
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return dt
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def _parse_offset(format_spec, default):
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offset, _, format_spec = format_spec.partition(_SEPARATOR)
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offset = offset[1:]
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fmt = _build_format_func(format_spec, default)
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if not offset or offset == "local":
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is_dst = time.daylight and time.localtime().tm_isdst > 0
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offset = -(time.altzone if is_dst else time.timezone)
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else:
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hours, _, minutes = offset.partition(":")
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offset = 3600 * int(hours)
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if minutes:
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offset += 60 * (int(minutes) if offset > 0 else -int(minutes))
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offset = datetime.timedelta(seconds=offset)
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def off(obj):
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return fmt(obj + offset)
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return off
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def _parse_sort(format_spec, default):
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args, _, format_spec = format_spec.partition(_SEPARATOR)
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fmt = _build_format_func(format_spec, default)
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if "d" in args or "r" in args:
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def sort_desc(obj):
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return fmt(sorted(obj, reverse=True))
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return sort_desc
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else:
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def sort_asc(obj):
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return fmt(sorted(obj))
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return sort_asc
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def _default_format(format_spec, default):
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def wrap(obj):
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return format(obj, format_spec)
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return wrap
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class Literal():
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# __getattr__, __getattribute__, and __class_getitem__
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# are all slower than regular __getitem__
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@staticmethod
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def __getitem__(key):
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return key
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_literal = Literal()
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_CACHE = {}
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_SEPARATOR = "/"
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_GLOBALS = {
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"_env": lambda: os.environ,
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"_lit": lambda: _literal,
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"_now": datetime.datetime.now,
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}
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_CONVERSIONS = {
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"l": str.lower,
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"u": str.upper,
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"c": str.capitalize,
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"C": string.capwords,
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"j": util.json_dumps,
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"t": str.strip,
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"T": util.datetime_to_timestamp_string,
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"d": text.parse_timestamp,
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"U": text.unescape,
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"g": text.slugify,
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"S": util.to_string,
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"s": str,
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"r": repr,
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"a": ascii,
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}
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_FORMAT_SPECIFIERS = {
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"?": _parse_optional,
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"[": _parse_slice,
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"D": _parse_datetime,
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"L": _parse_maxlen,
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"J": _parse_join,
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"O": _parse_offset,
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"R": _parse_replace,
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"S": _parse_sort,
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}
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