moment/src/backend/theme_parser.py

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# Copyright Mirage authors & contributors <https://github.com/mirukana/mirage>
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# SPDX-License-Identifier: LGPL-3.0-or-later
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"""QPL (Qt Property Language) theme files to QML converter.
QPL is a custom configuration format currently used for theme files.
This is a big hack and will be replaced in the future by a standard language.
"""
import re
from typing import Generator
PROPERTY_TYPES = {"bool", "double", "int", "list", "real", "string", "url",
"var", "date", "point", "rect", "size", "color"}
def _add_property(line: str) -> str:
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"""Return a QML property declaration line from a QPL property line."""
if re.match(r"^\s*[a-zA-Z\d_]+\s*:$", line):
return re.sub(r"^(\s*)(\S*\s*):$",
r"\1readonly property QtObject \2: QtObject",
line)
types = "|".join(PROPERTY_TYPES)
if re.match(fr"^\s*({types}) [a-zA-Z\d_]+\s*:", line):
return re.sub(r"^(\s*)(\S*)", r"\1property \2", line)
return line
def _process_lines(content: str) -> Generator[str, None, None]:
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"""Yield lines of real QML from lines of QPL."""
skip = False
indent = " " * 4
current_indent = 0
for line in content.split("\n"):
line = line.rstrip()
if not line.strip() or line.strip().startswith("//"):
continue
start_space_list = re.findall(r"^ +", line)
start_space = start_space_list[0] if start_space_list else ""
line_indents = len(re.findall(indent, start_space))
if not skip:
if line_indents > current_indent:
yield "%s{" % (indent * current_indent)
current_indent = line_indents
while line_indents < current_indent:
current_indent -= 1
yield "%s}" % (indent * current_indent)
line = _add_property(line)
yield line
skip = any((line.endswith(e) for e in "([{+\\,?:"))
while current_indent:
current_indent -= 1
yield "%s}" % (indent * current_indent)
def convert_to_qml(theme_content: str) -> str:
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"""Return valid QML code with imports from QPL content."""
theme_content = theme_content.replace("\t", " ")
lines = [
"import QtQuick 2.12",
'import "../Base"',
"QtObject {",
" function hsluv(h, s, l, a) { return utils.hsluv(h, s, l, a) }",
" function hsl(h, s, l) { return utils.hsl(h, s, l) }",
" function hsla(h, s, l, a) { return utils.hsla(h, s, l, a) }",
" id: theme",
]
lines += [f" {line}" for line in _process_lines(theme_content)]
lines += ["}"]
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return "\n".join(lines)