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import re
import sys
import abc
import dataclasses
import enum
import typing
import bs4
from bs4 import BeautifulSoup
from bs4.element import Tag
class ParseError(Exception):
pass
class Token(abc.ABC):
def to_latex(self) -> str:
raise NotImplementedError
class TextToken(Token):
def __init__(self, text: str):
self.text = text
def to_latex(self) -> str:
return self.text
class NotatedToken(Token):
def __init__(self, text: str, notation: str):
self.text = text
self.notation = notation
def to_latex(self) -> str:
if len(self.text) == 1:
return r'\ruby{%s}{%s}' % (self.text, self.notation)
else:
# TODO tokenize hiragana to make the annotation more accurate and beautiful
return r'\ruby[g]{%s}{%s}' % (self.text, self.notation)
class NewLineToken(Token):
def __init__(self):
pass
def to_latex(self) -> str:
return '\n\n'
class SectionBreaker(Token):
def __init__(self):
pass
def to_latex(self) -> str:
return r'\section*{}'
def optimize_typography(tokens: typing.Iterator[Token]) -> typing.Iterator[Token]:
prev = next(tokens)
for t in tokens:
if all([isinstance(x, NewLineToken) for x in (prev, t)]):
yield NewLineToken()
yield SectionBreaker()
else:
yield prev
prev = t
if prev:
yield prev
@dataclasses.dataclass
class LatexDocInjectionInfo:
packages: list[str]
header: list[str]
footer: list[str]
class CJKProvider(enum.Enum):
CJK = LatexDocInjectionInfo([r'\usepackage{CJKutf8}'], [r'\begin{CJK}{UTF8}{min}'], [r'\end{CJK}'])
xeCJK = LatexDocInjectionInfo([r'\usepackage{xeCJK}'], [], [])
def process_notated(ele: Tag):
ch = list(ele.children)
if (ln := len(ch)) != 2:
# Expecting a (kanji block, hiragana block)
raise ParseError(f'Invalid notated node length: {ln} != 2')
yield NotatedToken(*(x.text.strip() for x in ch))
def tokenize(lyric: Tag) -> typing.Iterator[Token]:
newline = NewLineToken()
for i, ele in enumerate(lyric):
if isinstance(ele, bs4.NavigableString):
# text
t = ele.text.strip()
if not t:
continue
yield TextToken(t)
elif isinstance(ele, bs4.Tag):
if ele.name == 'span':
yield from process_notated(ele)
elif ele.name == 'br':
# newline
yield newline
else:
print(f'** Ignore HTML element <unknown block {ele.name}>', file=sys.stderr)
else:
print(f'** Ignore {type(ele)}', file=sys.stderr)
class LatexGenerator:
centering: bool
cjk: CJKProvider
artist: typing.Optional[str]
title: typing.Optional[str]
cjk_font_main: typing.Optional[str]
cjk_font_sans: typing.Optional[str]
cjk_font_mono: typing.Optional[str]
def __init__(self):
self.artist, self.title = None, None
self.cjk_font_main, self.cjk_font_sans, self.cjk_font_mono = None, None, None
def generate_lyric(self, lyric_tokens: typing.Iterator[Token]) -> str:
injectors = []
injectors.append(LatexDocInjectionInfo([], [r'\usepackage{pxrubrica}'], []))
injectors.append(LatexDocInjectionInfo([], [r'\usepackage{setspace}', r'\doublespacing'], []))
injectors.append(LatexDocInjectionInfo([], [
r'\usepackage{geometry}',
r'\geometry{a4paper,left=20mm,right=20mm,top=10mm,bottom=20mm}',
], []))
injectors.append(LatexDocInjectionInfo([], [x for x in [
r'\setCJKmainfont{%s}' % self.cjk_font_main if self.cjk_font_main else None,
r'\setCJKsansfont{%s}' % self.cjk_font_sans if self.cjk_font_sans else None,
r'\setCJKmonofont{%s}' % self.cjk_font_mono if self.cjk_font_mono else None,
] if x], []))
injectors.append(LatexDocInjectionInfo([], [
r'\author{%s}' % (self.artist or ''),
r'\title{%s}' % (self.title or ''),
r'\date{}',
], []))
injectors.append(LatexDocInjectionInfo([], [r'\begin{document}'], [r'\end{document}']))
injectors.append(LatexDocInjectionInfo([], [r'\maketitle'], []))
if self.centering:
injectors.append(LatexDocInjectionInfo([], [r'\begin{center}'], [r'\end{center}']))
injectors.append(self.cjk.value)
def _inject(injectors, getter) -> str:
doc = ''
for i in injectors:
for s in getter(i):
doc += s
doc += '\n'
return doc
doc = r'\documentclass{article}' + '\n'
doc += _inject(injectors, lambda _i: _i.packages)
doc += _inject(injectors, lambda _i: _i.header)
for t in lyric_tokens:
doc += t.to_latex()
doc += _inject(injectors[::-1], lambda _i: _i.footer)
return doc
def main():
if len(sys.argv) > 2:
print(f'Usage: <{sys.argv[0]}> [path_to_html_file]')
exit(0)
if len(sys.argv) == 2:
file_name = sys.argv[1]
try:
with open(file_name, 'r', encoding='utf-8') as f:
html = f.read()
except FileNotFoundError:
print(f'File does not exist: {file_name}')
exit(1)
else:
# read html from STDIN
html = sys.stdin.read()
p = BeautifulSoup(html, "html5lib")
lyric = p.select_one('.hiragana')
if not lyric:
raise RuntimeError('Cannot find lyric element `.hiragana`')
tokens = tokenize(lyric)
tokens = optimize_typography(tokens)
gen = LatexGenerator()
gen.centering = True
gen.cjk = CJKProvider.xeCJK
title = None
artist = None
for s in p.select('script'):
if not s.string or 'cf_page_artist' not in s.string:
continue
entries = re.findall(r'cf_(.+) = "(.+)"', s.string)
for k, v in entries:
if k == 'page_artist':
artist = v
elif k == 'page_song':
title = v
gen.artist, gen.title = artist, title
# FIXME hardcoded CJK font
gen.cjk_font_main = 'Noto Serif CJK JP'
print(gen.generate_lyric(tokens))
if __name__ == '__main__':
main()
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