File size: 2,274 Bytes
631bc49 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 | """HTML -> greppable plain text. Pure stdlib: the task images have no bs4 and no internet to get it.
Whitespace inside <pre>/<code> is preserved -- these documents carry their worked examples in code
blocks, and a collapsed one ("mbarrier_init(&bar,1);// Initialize barrier") is unreadable.
"""
import re
import sys
from html.parser import HTMLParser
DROP = {"script", "style", "nav", "head", "noscript", "svg", "form"}
BLOCK = {"p", "div", "li", "tr", "br", "section", "article"}
HEAD = {"h1", "h2", "h3", "h4", "h5", "h6"}
class T(HTMLParser):
def __init__(self):
super().__init__(convert_charrefs=True)
self.out, self.skip, self.pre = [], 0, 0
def handle_starttag(self, tag, attrs):
if tag in DROP:
self.skip += 1
elif tag in ("pre", "code"):
if tag == "pre":
self.out.append("\n")
self.pre += 1
elif self.pre:
if tag == "br":
self.out.append("\n")
elif tag in HEAD:
self.out.append("\n\n### ")
elif tag in BLOCK:
self.out.append("\n")
elif tag in ("td", "th"):
self.out.append(" ")
def handle_endtag(self, tag):
if tag in DROP and self.skip:
self.skip -= 1
elif tag in ("pre", "code"):
if self.pre:
self.pre -= 1
if tag == "pre":
self.out.append("\n")
elif not self.pre and tag in HEAD | {"table"}:
self.out.append("\n")
def handle_data(self, d):
if self.skip:
return
if self.pre:
self.out.append(d) # verbatim: newlines and indentation are the content
elif d.strip():
self.out.append(d)
def convert(src):
p = T()
p.feed(src)
t = "".join(p.out)
# collapse runs of spaces only OUTSIDE code: do it line-wise, leaving indented lines alone
lines = []
for ln in t.splitlines():
lines.append(ln if ln[:1] in (" ", "\t") else re.sub(r"[ \t]{2,}", " ", ln).rstrip())
t = "\n".join(lines)
return re.sub(r"\n{3,}", "\n\n", t).strip() + "\n"
if __name__ == "__main__":
sys.stdout.write(convert(open(sys.argv[1], encoding="utf-8", errors="ignore").read()))
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