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May 16, 2024 13:23
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Test Python and lxml HTML parsers
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| CONTENTS = [ | |
| ( | |
| "content1", | |
| "<html><head><title>Test</title></head><body><h1>Parse me!</h1></body></html>", | |
| ), | |
| ( | |
| "content2", | |
| """<img width="200" src="image.png?param1=value1&aparam2=value2" />""", | |
| ), | |
| ( | |
| "content3", | |
| """<img width="200" src="image.png?param1=value1¶m2=value2" />""", | |
| ), | |
| ] | |
| from html.parser import HTMLParser | |
| import io | |
| from lxml import etree | |
| import difflib | |
| import sys | |
| AttrsList = list[tuple[str, str | None]] | |
| class MyHTMLParser(HTMLParser): | |
| def __init__(self): | |
| super().__init__() | |
| self.output = io.StringIO() | |
| def send(self, value: str): | |
| self.output.write(value) | |
| def format_attr(self, name: str, value: str | None) -> str: | |
| if value is None: | |
| return name | |
| return f'{name}="{value}"' | |
| def handle_starttag(self, tag: str, attrs: AttrsList, *, auto_close: bool = False): | |
| self.send(f"<{tag}") | |
| if attrs: | |
| self.send(" ") | |
| self.send(" ".join(self.format_attr(*attr) for attr in attrs)) | |
| if auto_close: | |
| self.send(" />") | |
| else: | |
| self.send(">") | |
| def handle_endtag(self, tag: str): | |
| self.send(f"</{tag}>") | |
| def handle_startendtag(self, tag: str, attrs: AttrsList): | |
| self.handle_starttag(tag, attrs, auto_close=True) | |
| def handle_data(self, data): | |
| self.send(data) | |
| def handle_entityref(self, name: str): | |
| self.send(f"&{name};") | |
| def handle_charref(self, name: str): | |
| self.send(f"&#{name};") | |
| def handle_comment(self, data: str): | |
| self.send(f"<!--{data}-->") | |
| def handle_decl(self, decl: str): | |
| self.send(f"<!{decl}>") | |
| def handle_pi(self, data: str): | |
| self.send(f"<?{data}>") | |
| class MyLxmlParser(object): | |
| def __init__(self): | |
| super().__init__() | |
| self.output = io.StringIO() | |
| def send(self, value: str): | |
| self.output.write(value) | |
| def format_attr(self, name: str, value: str | None) -> str: | |
| if value is None: | |
| return name | |
| return f'{name}="{value}"' | |
| def start(self, tag: str, attrs: AttrsList, *, auto_close: bool = False): | |
| self.send(f"<{tag}") | |
| if attrs: | |
| self.send(" ") | |
| self.send( | |
| " ".join( | |
| self.format_attr(attr_name, attr_value) | |
| for attr_name, attr_value in dict(attrs).items() | |
| ) | |
| ) | |
| if auto_close: | |
| self.send(" />") | |
| else: | |
| self.send(">") | |
| def end(self, tag: str): | |
| self.send(f"</{tag}>") | |
| def data(self, data): | |
| self.send(data) | |
| def comment(self, data: str): | |
| self.send(f"<!--{data}-->") | |
| def close(self): | |
| pass | |
| print( | |
| "###################################\n" | |
| "# Parsing with Python HTML parser #\n" | |
| "###################################" | |
| ) | |
| for content_name, content_value in CONTENTS: | |
| print(f"\033[93mProcessing {content_name} \033[0m") | |
| parser = MyHTMLParser() | |
| parser.feed(content_value) | |
| parser.output.seek(0) | |
| content_parsed = parser.output.read() | |
| if content_value == content_parsed: | |
| print(f" {content_value}") | |
| print(f" \033[92mParsing is transparent \033[0m") | |
| else: | |
| print("- expected") | |
| print("+ actual") | |
| differ = difflib.Differ() | |
| diffs = list( | |
| differ.compare(content_value.splitlines(), content_parsed.splitlines()) | |
| ) | |
| print("\n".join(f" {diff}" for diff in diffs)) | |
| print(f" \033[91mParsing is not transparent \033[0m") | |
| print("") | |
| print( | |
| "#################################\n" | |
| "# Parsing with LXML HTML parser #\n" | |
| "#################################" | |
| ) | |
| for content_name, content_value in CONTENTS: | |
| print(f"\033[93mProcessing {content_name} \033[0m") | |
| target = MyLxmlParser() | |
| parser = etree.HTMLParser(target=target) | |
| parser.feed(content_value) | |
| target.output.seek(0) | |
| content_parsed = target.output.read() | |
| if content_value == content_parsed: | |
| print(f" {content_value}") | |
| print(f" \033[92mParsing is transparent \033[0m") | |
| else: | |
| print("- expected") | |
| print("+ actual") | |
| differ = difflib.Differ() | |
| diffs = list( | |
| differ.compare(content_value.splitlines(), content_parsed.splitlines()) | |
| ) | |
| print("\n".join(f" {diff}" for diff in diffs)) | |
| print(f" \033[91mParsing is not transparent \033[0m") | |
| print("") |
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