mirror of https://github.com/zulip/zulip.git
460 lines
13 KiB
Python
460 lines
13 KiB
Python
from typing import Callable, List, Optional
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class FormattedException(Exception):
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pass
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class TemplateParserException(Exception):
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def __init__(self, message: str) -> None:
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self.message = message
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def __str__(self) -> str:
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return self.message
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class TokenizationException(Exception):
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def __init__(self, message: str, line_content: Optional[str] = None) -> None:
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self.message = message
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self.line_content = line_content
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class TokenizerState:
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def __init__(self) -> None:
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self.i = 0
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self.line = 1
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self.col = 1
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class Token:
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def __init__(self, kind: str, s: str, tag: str, line: int, col: int, line_span: int) -> None:
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self.kind = kind
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self.s = s
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self.tag = tag
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self.line = line
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self.col = col
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self.line_span = line_span
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def tokenize(text: str) -> List[Token]:
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def advance(n: int) -> None:
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for _ in range(n):
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state.i += 1
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if state.i >= 0 and text[state.i - 1] == "\n":
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state.line += 1
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state.col = 1
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else:
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state.col += 1
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def looking_at(s: str) -> bool:
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return text[state.i : state.i + len(s)] == s
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def looking_at_htmlcomment() -> bool:
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return looking_at("<!--")
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def looking_at_handlebarcomment() -> bool:
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return looking_at("{{!")
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def looking_at_djangocomment() -> bool:
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return looking_at("{#")
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def looking_at_handlebarpartial() -> bool:
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return looking_at("{{>")
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def looking_at_html_start() -> bool:
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return looking_at("<") and not looking_at("</")
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def looking_at_html_end() -> bool:
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return looking_at("</")
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def looking_at_handlebars_start() -> bool:
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return looking_at("{{#") or looking_at("{{^")
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def looking_at_handlebars_end() -> bool:
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return looking_at("{{/")
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def looking_at_django_start() -> bool:
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return looking_at("{% ") and not looking_at("{% end")
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def looking_at_django_end() -> bool:
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return looking_at("{% end")
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def looking_at_jinja2_end_whitespace_stripped() -> bool:
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return looking_at("{%- end")
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def looking_at_jinja2_start_whitespace_stripped_type2() -> bool:
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# This function detects tag like {%- if foo -%}...{% endif %}
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return looking_at("{%-") and not looking_at("{%- end")
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state = TokenizerState()
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tokens = []
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while state.i < len(text):
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try:
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if looking_at_htmlcomment():
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s = get_html_comment(text, state.i)
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tag = s[4:-3]
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kind = "html_comment"
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elif looking_at_handlebarcomment():
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s = get_handlebar_comment(text, state.i)
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tag = s[3:-2]
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kind = "handlebar_comment"
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elif looking_at_djangocomment():
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s = get_django_comment(text, state.i)
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tag = s[2:-2]
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kind = "django_comment"
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elif looking_at_handlebarpartial():
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s = get_handlebar_partial(text, state.i)
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tag = s[9:-2]
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kind = "handlebars_singleton"
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elif looking_at_html_start():
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s = get_html_tag(text, state.i)
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if s.endswith("/>"):
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end_offset = -2
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else:
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end_offset = -1
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tag_parts = s[1:end_offset].split()
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if not tag_parts:
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raise TemplateParserException("Tag name missing")
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tag = tag_parts[0]
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if is_special_html_tag(s, tag):
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kind = "html_special"
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elif is_self_closing_html_tag(s, tag):
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kind = "html_singleton"
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else:
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kind = "html_start"
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elif looking_at_html_end():
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s = get_html_tag(text, state.i)
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tag = s[2:-1]
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kind = "html_end"
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elif looking_at_handlebars_start():
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s = get_handlebars_tag(text, state.i)
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tag = s[3:-2].split()[0]
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kind = "handlebars_start"
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elif looking_at_handlebars_end():
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s = get_handlebars_tag(text, state.i)
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tag = s[3:-2]
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kind = "handlebars_end"
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elif looking_at_django_start():
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s = get_django_tag(text, state.i)
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tag = s[3:-2].split()[0]
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kind = "django_start"
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if s[-3] == "-":
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kind = "jinja2_whitespace_stripped_start"
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elif looking_at_django_end():
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s = get_django_tag(text, state.i)
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tag = s[6:-3]
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kind = "django_end"
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elif looking_at_jinja2_end_whitespace_stripped():
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s = get_django_tag(text, state.i)
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tag = s[7:-3]
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kind = "jinja2_whitespace_stripped_end"
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elif looking_at_jinja2_start_whitespace_stripped_type2():
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s = get_django_tag(text, state.i, stripped=True)
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tag = s[3:-3].split()[0]
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kind = "jinja2_whitespace_stripped_type2_start"
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else:
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advance(1)
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continue
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except TokenizationException as e:
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raise FormattedException(
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f'''{e.message} at Line {state.line} Col {state.col}:"{e.line_content}"''',
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)
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line_span = len(s.split("\n"))
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token = Token(
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kind=kind,
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s=s,
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tag=tag.strip(),
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line=state.line,
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col=state.col,
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line_span=line_span,
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)
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tokens.append(token)
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advance(len(s))
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def add_pseudo_end_token(kind: str) -> None:
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token = Token(
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kind=kind,
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s="</" + tag + ">",
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tag=tag,
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line=state.line,
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col=state.col,
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line_span=1,
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)
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tokens.append(token)
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if kind == "html_singleton":
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# Here we insert a Pseudo html_singleton_end tag so as to have
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# ease of detection of end of singleton html tags which might be
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# needed in some cases as with our html pretty printer.
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add_pseudo_end_token("html_singleton_end")
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if kind == "handlebars_singleton":
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# We insert a pseudo handlbar end tag for singleton cases of
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# handlebars like the partials. This helps in indenting multi line partials.
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add_pseudo_end_token("handlebars_singleton_end")
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return tokens
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def validate(
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fn: Optional[str] = None, text: Optional[str] = None, check_indent: bool = True
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) -> None:
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assert fn or text
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if fn is None:
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fn = "<in memory file>"
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if text is None:
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with open(fn) as f:
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text = f.read()
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try:
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tokens = tokenize(text)
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except FormattedException as e:
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raise TemplateParserException(
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f"""
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fn: {fn}
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{e}"""
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)
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class State:
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def __init__(self, func: Callable[[Token], None]) -> None:
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self.depth = 0
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self.matcher = func
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def no_start_tag(token: Token) -> None:
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raise TemplateParserException(
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f"""
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No start tag
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fn: {fn}
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end tag:
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{token.tag}
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line {token.line}, col {token.col}
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"""
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)
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state = State(no_start_tag)
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def start_tag_matcher(start_token: Token) -> None:
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state.depth += 1
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start_tag = start_token.tag.strip("~")
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start_line = start_token.line
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start_col = start_token.col
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old_matcher = state.matcher
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def f(end_token: Token) -> None:
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end_tag = end_token.tag.strip("~")
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end_line = end_token.line
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end_col = end_token.col
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if start_tag == "a":
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max_lines = 3
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else:
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max_lines = 1
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problem = None
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if (start_tag == "code") and (end_line == start_line + 1):
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problem = "Code tag is split across two lines."
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if start_tag != end_tag:
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problem = "Mismatched tag."
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elif check_indent and (end_line > start_line + max_lines):
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if end_col != start_col:
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problem = "Bad indentation."
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if problem:
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raise TemplateParserException(
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f"""
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fn: {fn}
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{problem}
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start:
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{start_token.s}
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line {start_line}, col {start_col}
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end tag:
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{end_tag}
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line {end_line}, col {end_col}
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"""
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)
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state.matcher = old_matcher
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state.depth -= 1
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state.matcher = f
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for token in tokens:
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kind = token.kind
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tag = token.tag
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if kind == "html_start":
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start_tag_matcher(token)
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elif kind == "html_end":
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state.matcher(token)
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elif kind == "handlebars_start":
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start_tag_matcher(token)
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elif kind == "handlebars_end":
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state.matcher(token)
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elif kind in {
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"django_start",
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"jinja2_whitespace_stripped_start",
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"jinja2_whitespace_stripped_type2_start",
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}:
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if is_django_block_tag(tag):
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start_tag_matcher(token)
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elif kind in {"django_end", "jinja2_whitespace_stripped_end"}:
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state.matcher(token)
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if state.depth != 0:
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raise TemplateParserException("Missing end tag")
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def is_special_html_tag(s: str, tag: str) -> bool:
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return tag in ["link", "meta", "!DOCTYPE"]
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OPTIONAL_CLOSING_TAGS = [
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"circle",
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"img",
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"input",
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"path",
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"polygon",
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"stop",
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]
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def is_self_closing_html_tag(s: str, tag: str) -> bool:
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if s.endswith("/>"):
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if tag in OPTIONAL_CLOSING_TAGS:
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return True
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raise TokenizationException("Singleton tag not allowed", tag)
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self_closing_tag = tag in [
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"area",
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"base",
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"br",
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"col",
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"embed",
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"hr",
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"img",
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"input",
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"param",
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"source",
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"track",
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"wbr",
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]
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if self_closing_tag:
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return True
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return False
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def is_django_block_tag(tag: str) -> bool:
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return tag in [
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"autoescape",
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"block",
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"comment",
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"for",
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"if",
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"ifequal",
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"macro",
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"verbatim",
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"blocktrans",
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"trans",
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"raw",
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"with",
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]
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def get_handlebars_tag(text: str, i: int) -> str:
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end = i + 2
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while end < len(text) - 1 and text[end] != "}":
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end += 1
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if text[end] != "}" or text[end + 1] != "}":
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raise TokenizationException('Tag missing "}}"', text[i : end + 2])
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s = text[i : end + 2]
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return s
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def get_django_tag(text: str, i: int, stripped: bool = False) -> str:
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end = i + 2
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if stripped:
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end += 1
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while end < len(text) - 1 and text[end] != "%":
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end += 1
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if text[end] != "%" or text[end + 1] != "}":
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raise TokenizationException('Tag missing "%}"', text[i : end + 2])
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s = text[i : end + 2]
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return s
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def get_html_tag(text: str, i: int) -> str:
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quote_count = 0
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end = i + 1
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unclosed_end = 0
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while end < len(text) and (text[end] != ">" or quote_count % 2 != 0 and text[end] != "<"):
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if text[end] == '"':
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quote_count += 1
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if not unclosed_end and text[end] == "<":
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unclosed_end = end
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end += 1
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if quote_count % 2 != 0:
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if unclosed_end:
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raise TokenizationException("Unbalanced Quotes", text[i:unclosed_end])
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else:
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raise TokenizationException("Unbalanced Quotes", text[i : end + 1])
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if end == len(text) or text[end] != ">":
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raise TokenizationException('Tag missing ">"', text[i : end + 1])
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s = text[i : end + 1]
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return s
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def get_html_comment(text: str, i: int) -> str:
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end = i + 7
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unclosed_end = 0
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while end <= len(text):
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if text[end - 3 : end] == "-->":
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return text[i:end]
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if not unclosed_end and text[end] == "<":
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unclosed_end = end
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end += 1
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raise TokenizationException("Unclosed comment", text[i:unclosed_end])
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def get_handlebar_comment(text: str, i: int) -> str:
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end = i + 5
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unclosed_end = 0
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while end <= len(text):
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if text[end - 2 : end] == "}}":
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return text[i:end]
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if not unclosed_end and text[end] == "<":
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unclosed_end = end
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end += 1
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raise TokenizationException("Unclosed comment", text[i:unclosed_end])
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def get_django_comment(text: str, i: int) -> str:
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end = i + 4
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unclosed_end = 0
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while end <= len(text):
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if text[end - 2 : end] == "#}":
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return text[i:end]
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if not unclosed_end and text[end] == "<":
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unclosed_end = end
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end += 1
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raise TokenizationException("Unclosed comment", text[i:unclosed_end])
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def get_handlebar_partial(text: str, i: int) -> str:
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end = i + 10
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unclosed_end = 0
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while end <= len(text):
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if text[end - 2 : end] == "}}":
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return text[i:end]
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if not unclosed_end and text[end] == "<":
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unclosed_end = end
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end += 1
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raise TokenizationException("Unclosed partial", text[i:unclosed_end])
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