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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,132 @@ | ||
| #!/usr/bin/env python3 | ||
| # Tidy an xml2rfc file. | ||
| # | ||
| # This: | ||
| # * removes non-semantic content (comments, processing instructions, DOCTYPE | ||
| # declarations, broken entity references) | ||
| # * wraps BCP 14 language in <bcp14> elements | ||
| # * indents elements neatly | ||
|
|
||
| import sys | ||
| import xml.sax | ||
| import re | ||
| from xml.sax.saxutils import escape, quoteattr | ||
|
|
||
| class Tidy(xml.sax.handler.ContentHandler): | ||
| pattern = re.compile( | ||
| r"\b((?:(?:MUST|SHOULD|SHALL)(?:\s+NOT)?)|(?:(?:NOT\s+)?RECOMMENDED)|MAY|OPTIONAL|REQUIRED)\b" | ||
| ) | ||
|
|
||
| def __init__(self): | ||
| self.tags = [] | ||
| self.nesting = 0 | ||
| self.c = "" | ||
| self.state = "" | ||
|
|
||
| def startDocument(self): | ||
| print('<?xml version="1.0" encoding="UTF-8"?>') | ||
|
|
||
| def preserve(tag): | ||
| return tag in ["artwork", "sourcecode"] | ||
|
|
||
| def textElement(tag): | ||
| return tag in [ | ||
| "annotation", | ||
| "blockquote", | ||
| "dd", | ||
| "dt", | ||
| "em", | ||
| "li", | ||
| "preamble", | ||
| "refcontent", | ||
| "strong", | ||
| "sub", | ||
| "sup", | ||
| "t", | ||
| "td", | ||
| "th", | ||
| "tt", | ||
| ] | ||
|
|
||
| def inline(tag): | ||
| return tag in ["code", "cref", "em", "eref", "iref", "sub", "sup", "tt", "xref"] | ||
|
|
||
| def flush(self, tag, start=None): | ||
| if Tidy.preserve(tag): | ||
| c = f"<![CDATA[{self.c}]]>" | ||
| else: | ||
| c = escape(self.c) | ||
| if Tidy.textElement(tag): | ||
| if self.state == "open": | ||
| # The element is opening, so strip left is safe. | ||
| c = c.lstrip() | ||
| if start is None or not Tidy.inline(start): | ||
| # The element is closing, or the element that is starting | ||
| # isn't inline, so strip right is safe. | ||
| c = c.rstrip() | ||
| c = Tidy.pattern.sub(r"<bcp14>\1</bcp14>", c) | ||
| else: | ||
| c = c.strip() | ||
|
|
||
| if c != "": | ||
| if self.state == "open": | ||
| print(">", end="") | ||
| print(c, end="") | ||
| self.state = "text" | ||
| self.nl = False | ||
|
|
||
| self.c = "" | ||
|
|
||
| def currentTag(self): | ||
| return next(reversed(self.tags), False) | ||
|
|
||
| def startElement(self, tag, attributes): | ||
| parent = self.currentTag() | ||
| self.flush(parent, tag) | ||
|
|
||
| if self.state == "open": | ||
| print(">", end="") | ||
| if not Tidy.inline(tag): | ||
| print() | ||
|
|
||
| self.tags.append(tag) | ||
| if not Tidy.inline(tag): | ||
| print(" " * self.nesting, end="") | ||
| self.nesting = self.nesting + 1 | ||
|
|
||
| print(f"<{tag}", end="") | ||
| for name, value in attributes.items(): | ||
| print(f" {name}={quoteattr(value)}", end="") | ||
|
|
||
| self.state = "open" | ||
| self.nl = False | ||
|
|
||
| def endElement(self, tag): | ||
| self.flush(self.tags.pop()) | ||
|
|
||
| if not Tidy.inline(tag): | ||
| self.nesting = self.nesting - 1 | ||
| if self.nl and not Tidy.inline(self.currentTag()): | ||
| print(" " * self.nesting, end="") | ||
| if self.state == "open": | ||
| print("/>", end="") | ||
| else: | ||
| print(f"</{tag}>", end="") | ||
| self.nl = not Tidy.inline(tag) | ||
| if self.nl: | ||
| print() | ||
| self.state = "close" | ||
|
|
||
| def characters(self, content): | ||
| self.c = self.c + content | ||
|
|
||
| def processingInstruction(self, target, data): | ||
| pass | ||
|
|
||
|
|
||
| parser = xml.sax.make_parser() | ||
| parser.setContentHandler(Tidy()) | ||
| if len(sys.argv) >= 2: | ||
| parser.parse(sys.argv[1]) | ||
| else: | ||
| parser.parse(sys.stdin) |