odysseus/src/email_thread_parser.py at dev · odysseus-dev/odysseus · GitHub

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"""

email_thread_parser.py

Server-side port of the JS thread parser in static/js/emailLibrary.js.

Walks an email body (HTML or plain text) and returns a tree of reply turns

that the client can render directly without re-parsing.

Mirrors the rules from talon (mailgun) and email-reply-parser:

- Multilingual "On <date>, <name> wrote:" attribution lines (20+ locales)

- Outlook-style "From: ... Sent: ... Subject:" header blocks

- "----- Original Message -----" delimiters

- <blockquote> nesting (HTML)

- "> " prefix nesting (plain text)

Returns a list of dicts:

[

{"level": 0, "body_html": "...", "meta": null},

{"level": 1, "body_html": "...", "meta": "Alice <a@x> · May 5"},

{"level": 2, "body_html": "...", "meta": "Bob <b@y> · May 4"},

...

]

where level 0 is the current reply, increasing levels = deeper in the chain.

"""

from __future__ import annotations

import html as _html

import re

from typing import Any

# Bump whenever the parser's output shape or splitting rules change. The

# cache layer wraps turns as {"v": THREAD_PARSER_VERSION, "turns": [...]}

# and treats anything with a different version as stale.

THREAD_PARSER_VERSION = 6

# ── Locale tables (same as static/js/emailLibrary.js _TALON_*) ──

_WROTE = (

r"hat geschrieben|kirjoitti|написала|escreveu)"

)

_FROM = (

r"(?:From|Från|Von|De|Da|От|Od|Van|差出人|发件人|寄件人|Lähettäjä|"

r"Avsender|Pošiljatelj|Frá)"

)

_SENT = (

)

_SUBJ = (

r"件名|主题|主旨|Emne|Aihe|Konu)"

)

_TO = r"(?:To|Till|An|À|A|Voor|Para|Naar|Кому|Do|宛先|收件人|Komu)"

_CCBCC = r"(?:Cc|Bcc|Kopie|Skrytá kopie|Копия)"

_HDR_KEYS = rf"(?:{_FROM}|{_SENT}|{_SUBJ}|{_TO}|{_CCBCC}|Importance|Priority)"

_ORIG_RE = re.compile(

r"(?:^|\n)[\s>]*[-_=]{3,}\s*(?:Original\s+Message|Forwarded\s+message|"

r"Ursprüngliche\s+Nachricht|"

r"Mensaje\s+original|Messaggio\s+originale|Message\s+d['’]origine|"

r"Oorspronkelijk\s+bericht|Original\s+meddelande|原文|原始邮件|転送)"

r"\s*[-_=]{3,}",

re.IGNORECASE,

)

_WROTE_LINE_RE = re.compile(rf"^\s*On\s.+?\s{_WROTE}\s*:\s*$", re.IGNORECASE | re.MULTILINE)

# CJK-style attribution lines — Japanese Gmail / Yahoo Mail JP / etc.

# Examples (all valid):

# 2026年5月11日(月) 21:28 <alice@example.com>:

# 2026年5月11日 21:28 alice@example.com:

# 2026/05/11 21:28 <alice@example.com> のメッセージ:

# 2026年5月11日(月) 21:28に Alice Smith <alice@example.com> のメッセージ:

# 2026年5月11日 21:28、alice@example.com さんは書きました:

# Alice さんは 2026/05/11 21:28 に書きました:

_CJK_ATTRIB_LINE_RE = re.compile(

r"^\s*(?:"

# date(weekday) time <email>: (Gmail JP default)

r"\d{4}[年/.-]\d{1,2}[月/.-]\d{1,2}日?(?:\s*[$\(].+?[$\)])?"

r"\s+\d{1,2}:\d{2}(?:\s*[ＡＰAP][ＭM])?"

r"(?:に|、|,)?\s*(?:.+?\s+)?[<＜]?[\w.+\-]+@[\w.\-]+\.[A-Za-z]{2,}[>＞]?"

r"\s*(?:のメッセージ|さんは(?:書|お?書き)きました|wrote)?\s*[:：]\s*$"

r"|"

# 何々さんは 2026/05/11 21:28 に書きました:

r".+?(?:さん|様)\s*(?:は|が)\s+\d{4}[年/.-]\d{1,2}[月/.-]\d{1,2}日?"

r"(?:\s*[$\(].+?[$\)])?\s+\d{1,2}:\d{2}\s*(?:に)?\s*(?:書|お?書き)きました\s*[:：]\s*$"

r"|"

# Chinese "XXX 写道:" preceded by a date or address

r".+?\s*写道\s*[:：]\s*$"

r"|"

# Korean "님이 작성:"

r".+?\s*님이\s*작성(?:한\s*내용)?\s*[:：]\s*$"

r")",

re.MULTILINE,

)

_OUTLOOK_HEADER_RE = re.compile(

rf"{_FROM}\s*:\s*[^\n]+\s*\n\s*(?:.+\n)?{_SENT}\s*:\s*[^\n]+\s*\n",

re.IGNORECASE,

)

# Stop the From/Date captures at the next header key so they don't swallow

# the whole header block when whitespace has been normalised.

_FROM_STOP = rf"\s+(?:{_FROM}|{_SENT}|{_SUBJ}|{_TO}|{_CCBCC}|Importance|Priority)\s*:"

_DATE_STOP = rf"\s+(?:{_FROM}|{_SUBJ}|{_TO}|{_CCBCC}|Importance|Priority)\s*:"

_QUOTE_META_FROM = re.compile(

rf"{_FROM}\s*:\s*(.+?)(?:(?={_FROM_STOP})|$)",

re.IGNORECASE | re.DOTALL,

)

_QUOTE_META_DATE = re.compile(

rf"{_SENT}\s*:\s*(.+?)(?:(?={_DATE_STOP})|$)",

re.IGNORECASE | re.DOTALL,

)

# Greedy date capture so multi-comma dates ("Thu, May 7, 2026, 11:33 AM,")

# don't collapse to just the day. We let the comma + lazy author match

# back off to the LAST comma before "wrote:".

_GMAIL_ATTRIB = re.compile(

rf"On\s+(.+),\s+([^,]+?)\s+{_WROTE}\s*:",

re.IGNORECASE | re.DOTALL,

)

def _extract_quote_meta(text_or_html: str) -> str | None:

"""Pull a '<sender> · <date>' chip from a quoted block. Preserves

angle-bracketed email addresses (`<foo@bar.com>`) so callers can

identify the sender for chat-bubble alignment."""

if not text_or_html:

return None

plain = re.sub(r"<style[\s\S]*?</style>", " ", text_or_html, flags=re.IGNORECASE)

# Strip HTML tags, but keep <foo@bar> patterns since they carry the

# sender's address that downstream consumers (bubble renderer) need.

plain = re.sub(r"<(?![^@>\s]+@[^@>\s]+>)[^>]+>", " ", plain)

plain = re.sub(r" ", " ", plain, flags=re.IGNORECASE)

plain = plain.replace("&", "&").replace("<", "<").replace(">", ">").replace(""", '"')

plain = re.sub(r"\s+", " ", plain).strip()[:1500]

f = _QUOTE_META_FROM.search(plain)

d = _QUOTE_META_DATE.search(plain)

if f and d:

return f"{f.group(1).strip()} · {d.group(1).strip()[:80]}"

g = _GMAIL_ATTRIB.search(plain)

if g:

date, who = g.group(1).strip(), g.group(2).strip()

return f"{who} · {date}"

# CJK attribution: "YYYY年MM月DD日(曜) HH:MM <email>:"

cjk = re.search(

r"(\d{4}[年/.-]\d{1,2}[月/.-]\d{1,2}日?(?:\s*[$\(][^$\)]+?[\)\)])?\s+\d{1,2}:\d{2}(?:\s*[ＡＰAP][ＭM])?)"

r"\s*(?:に|、|,)?\s*"

r"(?:(.+?)\s+)?" # optional display name

r"[<＜]?([\w.+\-]+@[\w.\-]+\.[A-Za-z]{2,})[>＞]?",

plain,

)

if cjk:

date = cjk.group(1).strip()

who = (cjk.group(2) or cjk.group(3) or '').strip()

return f"{who} · {date}" if who else date

if f:

return f.group(1).strip()

if d:

return d.group(1).strip()

return None

# ── Plaintext path ──

# Outlook sometimes renders a one-line "conversation summary header" at

# the very top of a reply when the recipient's mail client copies it from

# the reading pane (whitespace gets squashed). Looks like:

# "alice@example.comThursday, May 7, 2026 3:06 PM To: housekeeping <...> Subject: ..."

# or just:

# "alice@example.comThursday, May 7, 2026 3:06 PM"

# Same info already lives in the envelope, so strip it.

_MASHED_HDR_RE = re.compile(

r"^\s*[\w.+\-]+@[\w.\-]+\.[A-Za-z]{2,}" # email address

r"\s*"

r"(?:Mon|Tue|Wed|Thu|Fri|Sat|Sun)[a-z]*,?\s+" # day name

r"\S+\s+\d+,?\s*\d{4}\s+\d{1,2}:\d{2}" # date + time

r"(?:\s*[AP]M)?" # optional AM/PM

rf"(?:\s+{_TO}\s*:\s*[^\n]+(?:\s+{_SUBJ}\s*:\s*[^\n]*)?)?" # optional To:/Subject:

r"\s*(?:\n|$)", # end of line

re.IGNORECASE,

)

def _strip_mashed_header(text: str) -> str:

if not text:

return text

m = _MASHED_HDR_RE.match(text)

if not m:

return text

rest = text[m.end():]

# Skip any blank lines that immediately follow the strip.

rest = re.sub(r"^\s*\n+", "", rest)

return rest

def _normalize_body(text: str) -> str:

"""Strip noise that mail clients (mostly Outlook) inject into the

plaintext body but that adds no signal — duplicate <mailto:> link

decorations, bracketed-URL annotations, repeated blank lines, and

the mashed conversation-header at the top."""

if not text:

return text

text = _strip_mashed_header(text)

# Outlook appends `<mailto:foo@bar>` after every email address it

# finds, and `<https://...>` after every URL. Both are duplicate

# noise — they show the same target as the visible text. Drop them.

text = re.sub(r"<mailto:[^<>\s]*>", "", text, flags=re.IGNORECASE)

text = re.sub(r"<https?://[^<>\s]*>", "", text, flags=re.IGNORECASE)

# Trim trailing whitespace (incl. NBSP / form-feed / tab) so blank

# lines that mail clients fill with non-breaking spaces still count

# as blank for the collapse step below.

text = re.sub(r"[^\S\n]+(\n|$)", r"\1", text)

# Collapse 3+ consecutive newlines (vertical-space soup) into 2.

text = re.sub(r"\n{3,}", "\n\n", text)

return text

def _outlook_header_block_end(stripped: list[str], levels: list[int], start: int) -> int:

"""If lines[start..N] form an Outlook From/Sent/To/Subject header block

at the same base level, return N (exclusive end). Otherwise return start.

Requires a From: line followed within 5 lines by a Sent:/Date: line."""

if start >= len(stripped):

return start

base = levels[start]

first = stripped[start].strip()

if not re.match(rf"^{_FROM}\s*:\s*\S", first, re.IGNORECASE):

return start

# Look ahead for the matching Sent:/Date: line at the same base level.

found_sent = False

j = start + 1

while j < len(stripped) and j < start + 6 and levels[j] == base:

nl = stripped[j].strip()

if not nl:

j += 1

continue

if re.match(rf"^{_SENT}\s*:", nl, re.IGNORECASE):

found_sent = True

break

if not re.match(rf"^{_HDR_KEYS}\s*:", nl, re.IGNORECASE):

return start # something other than a header key — abort

j += 1

if not found_sent:

return start

# Consume header-key lines until we hit a non-header line OR a blank line.

j = start + 1

while j < len(stripped) and levels[j] == base:

nl = stripped[j].strip()

if not nl:

j += 1

break

if re.match(rf"^{_HDR_KEYS}\s*:", nl, re.IGNORECASE):

j += 1

continue

break

return j

def _parse_plaintext(text: str) -> list[dict[str, Any]] | None:

"""Walk `>` quote prefix levels + inline attribution markers at any

level. Each attribution event AND each `>`-level increment counts as

one conversation step, with one important exception: an attribution

marker IMMEDIATELY followed by a deeper `>` block is the same event

as that `>` increase (the classic Gmail "On X wrote:\\n> quoted"

pattern) and contributes only one step.

Returns a flat list of {level, body_html, meta} or None when nothing

quoted is detected."""

if not text or len(text) > 200_000:

return None

text = _normalize_body(text)

lines = text.splitlines()

base_levels: list[int] = []

stripped_lines: list[str] = []

for line in lines:

m = re.match(r"^((?:>\s?)+)", line)

n = line[: m.end()].count(">") if m else 0

base_levels.append(n)

stripped_lines.append(re.sub(r"^(?:>\s?)+", "", line) if n > 0 else line)

has_quotes = any(l > 0 for l in base_levels)

has_attrib = bool(

_WROTE_LINE_RE.search(text) or _ORIG_RE.search(text)

or _OUTLOOK_HEADER_RE.search(text) or _CJK_ATTRIB_LINE_RE.search(text)

)

if not has_quotes and not has_attrib:

return None

turns: list[dict[str, Any]] = []

buf: list[str] = []

cur_level = 0

pending_meta: str | None = None

# depth_at_base[B] = the effective conversation depth recorded the

# last time we were at `>` base level B. Used to restore depth when

# the > nesting decreases (we hop back to a shallower base).

depth_at_base: dict[int, int] = {0: 0}

depth = 0

prev_base = 0

def lookahead_content_base(start_idx: int) -> int | None:

j = start_idx

while j < len(lines) and not stripped_lines[j].strip():

j += 1

return base_levels[j] if j < len(lines) else None

def flush() -> None:

# `buf` is only mutated via .clear() / .append() in the enclosing

# scope, never re-assigned, so it doesn't need `nonlocal`.

nonlocal pending_meta

if not buf:

return

body = "\n".join(buf).rstrip()

if body or cur_level > 0:

turns.append({

"level": cur_level,

"body_html": _escape_to_html(body),

"meta": pending_meta,

})

buf.clear()

pending_meta = None

i = 0

while i < len(lines):

base = base_levels[i]

stripped = stripped_lines[i]

# `>` base level change → flush current turn, then step depth.

if base > prev_base:

flush()

for b in range(prev_base + 1, base + 1):

depth += 1

depth_at_base[b] = depth

cur_level = depth

elif base < prev_base:

flush()

depth = depth_at_base.get(base, base)

for b in list(depth_at_base.keys()):

if b > base:

del depth_at_base[b]

cur_level = depth

prev_base = base

is_gmail = bool(re.match(rf"^\s*On\s.+?\s{_WROTE}\s*:\s*$", stripped, re.IGNORECASE))

is_cjk = bool(_CJK_ATTRIB_LINE_RE.match(stripped))

is_orig = bool(_ORIG_RE.search("\n" + stripped))

outlook_end = _outlook_header_block_end(stripped_lines, base_levels, i)

is_outlook = outlook_end > i

if is_gmail or is_cjk or is_orig or is_outlook:

# Collect the full attribution text for meta extraction.

attrib_end = outlook_end if is_outlook else (i + 1)

meta_text = "\n".join(stripped_lines[i:attrib_end])

# "-----Original Message-----" is almost always immediately

# followed by an Outlook From:/Sent: header — fold that into

# the SAME attribution event so we don't double-bump.

if is_orig:

j = attrib_end

while j < len(lines) and base_levels[j] == base and not stripped_lines[j].strip():

j += 1

if j < len(lines) and base_levels[j] == base:

oe2 = _outlook_header_block_end(stripped_lines, base_levels, j)

if oe2 > j:

meta_text = meta_text + "\n" + "\n".join(stripped_lines[j:oe2])

attrib_end = oe2

# If the next content line lives at a deeper > base, the

# upcoming `>` increase will be the depth step — suppress

# our own bump so we don't double up. Otherwise, this

# attribution IS the step.

next_base = lookahead_content_base(attrib_end)

flush()

if next_base is not None and next_base > base:

pending_meta = _extract_quote_meta(meta_text) or meta_text.strip().splitlines()[0]

else:

depth += 1

depth_at_base[base] = depth

cur_level = depth

pending_meta = _extract_quote_meta(meta_text) or meta_text.strip().splitlines()[0]

i = attrib_end

continue

buf.append(stripped)

i += 1

flush()

if not turns or (len(turns) == 1 and turns[0]["level"] == 0):

return None

return turns

def _escape_to_html(text: str) -> str:

"""Conservative plaintext → HTML: escape, then linkify URLs and convert

newlines to <br>."""

if not text:

return ""

out = _html.escape(text)

out = re.sub(

r"(https?://[^\s<>\"]+)",

lambda m: f'<a href="{m.group(1)}" target="_blank" rel="noopener">{m.group(1)}</a>',

out,

)

return out.replace("\n", "<br>")

# ── HTML path (BeautifulSoup) ──

def _is_quote_container(tag) -> bool:

"""Return True if a BeautifulSoup tag is a known quote-container element.

Covers Gmail (`gmail_quote`), Apple Mail (`type="cite"`), Yahoo

(`yahoo_quoted`), Outlook (`divRplyFwdMsg`, `OutlookMessageHeader`,

`gmail_attr` precedes a quote in some forwards), and the standard

`<blockquote>`."""

if tag is None:

return False

name = (getattr(tag, "name", None) or "").lower()

if name == "blockquote":

return True

cls = " ".join(tag.get("class") or []).lower() if hasattr(tag, "get") else ""

if "gmail_quote" in cls or "yahoo_quoted" in cls or "moz-cite-prefix" in cls:

return True

if "outlookmessageheader" in cls or "wordsection1" in cls:

return True

if (tag.get("id") if hasattr(tag, "get") else "") == "divRplyFwdMsg":

return True

typ = (tag.get("type") if hasattr(tag, "get") else "") or ""

if name == "div" and typ.lower() == "cite":

return True

return False

def _parse_html(html: str) -> list[dict[str, Any]] | None:

"""Walk top-level quote-container elements and recurse into nested ones.

Returns None if no quote markers are present. Recognises <blockquote>

plus the Gmail / Apple Mail / Yahoo / Outlook / Thunderbird wrappers

that don't use <blockquote>."""

if not html or len(html) > 200_000:

return None

try:

from bs4 import BeautifulSoup

except Exception:

return None # bs4 not installed → caller falls back to plaintext / client parse

try:

soup = BeautifulSoup(html, "html.parser")

except Exception:

return None

# Find all quote containers, then keep only the top-level ones (those

# whose nearest ancestor that's also a quote container is None).

all_quotes = [t for t in soup.find_all(True) if _is_quote_container(t)]

if not all_quotes:

return None

def has_quote_ancestor(t) -> bool:

p = t.parent

while p is not None:

if _is_quote_container(p):

return True

p = p.parent

return False

tops = [t for t in all_quotes if not has_quote_ancestor(t)]

if not tops:

return None

turns: list[dict[str, Any]] = []

# Collect the new-reply content from OUTSIDE the quote containers.

# Most replies are top-posted (head), but Japanese / formal emails are

# frequently bottom-posted (tail). Some users do both. We combine head

# and tail into a single level-0 turn so the new content always shows

# first, regardless of source-order position.

parent_children = list(tops[0].parent.children if tops[0].parent else [])

head_nodes = []

for sib in parent_children:

if sib is tops[0]:

break

head_nodes.append(sib)

# Tail = everything after the LAST top-level quote at this parent level

last_top = tops[-1]

tail_nodes = []

after_last = False

for sib in parent_children:

if sib is last_top:

after_last = True

continue

# Skip any other top-level quotes between (they get walked below)

if after_last and sib in tops:

continue

if after_last:

tail_nodes.append(sib)

def _strip_trailing_attribution(html_chunk: str) -> str:

text = re.sub(r"<[^>]+>", " ", html_chunk)

if not (_WROTE_LINE_RE.search(text) or _ORIG_RE.search(text) or _CJK_ATTRIB_LINE_RE.search(text)):

return html_chunk

html_chunk = re.sub(

rf"(?:<br\s*/?>|</p>|</div>|\n)?\s*On\s.+?\s{_WROTE}\s*:\s*(?:</[^>]+>)*\s*$",

"",

html_chunk,

flags=re.IGNORECASE | re.DOTALL,

)

html_chunk = re.sub(

r"(?:<br\s*/?>|</p>|</div>|\n)?\s*"

r"(?:\d{4}[年/.-]\d{1,2}[月/.-]\d{1,2}日?(?:\s*[$\(][^$\)]+?[\)\)])?"

r"\s+\d{1,2}:\d{2}(?:\s*[ＡＰAP][ＭM])?(?:に|、|,)?"

r"\s*(?:.+?\s+)?[<＜]?[\w.+\-]+@[\w.\-]+\.[A-Za-z]{2,}[>＞]?"

r"\s*(?:のメッセージ|さんは(?:書|お?書き)きました|wrote)?\s*[:：]"

r"\s*(?:</[^>]+>)*\s*$",

"",

html_chunk,

flags=re.DOTALL,

)

return html_chunk

head_html = _strip_trailing_attribution("".join(str(n) for n in head_nodes))

tail_html = "".join(str(n) for n in tail_nodes)

# Stitch head + tail. Tail (bottom-posted reply) goes first because

# that's the most-recent / most-relevant content; head (which may just

# be empty or a forwarded preamble) follows.

parts = []

if tail_html.strip(): parts.append(tail_html.strip())

if head_html.strip(): parts.append(head_html.strip())

if parts:

turns.append({

"level": 0,

"body_html": "<br><br>".join(parts) if len(parts) > 1 else parts[0],

"meta": None,

})

def _walk(node, level: int):

meta_from_node = _extract_quote_meta(str(node))

# Recurse into nested quote containers inside this one, then strip

# them so the body of THIS turn doesn't include them.

nested = [t for t in node.find_all(True, recursive=True) if _is_quote_container(t)]

# Keep only direct-quote descendants (no other quote container between)

def has_quote_between(child, ancestor) -> bool:

p = child.parent

while p is not None and p is not ancestor:

if _is_quote_container(p):

return True

p = p.parent

return False

direct_nested = [n for n in nested if not has_quote_between(n, node)]

for n in list(direct_nested):

n.extract()

body_html = node.decode_contents()

# Collapse "wrapper-only" quote containers: if the only remaining

# content of this node (after pulling out nested quotes) is an

# attribution line, don't emit a separate turn for it. Instead,

# pass the attribution down as meta for the directly-nested child.

# Without this collapse, gmail_quote_container produces a phantom

# bubble that contains just the JP/EN attribution line.

body_text = re.sub(r"<[^>]+>", " ", body_html).strip()

body_text = _html.unescape(body_text)

body_text_collapsed = re.sub(r"\s+", " ", body_text).strip()

is_attrib_only = bool(body_text_collapsed) and (

_CJK_ATTRIB_LINE_RE.match(body_text_collapsed)

or re.match(rf"^\s*On\s.+?\s{_WROTE}\s*:\s*$", body_text_collapsed, re.IGNORECASE)

or _OUTLOOK_HEADER_RE.match(body_text_collapsed)

)

if is_attrib_only and len(direct_nested) == 1:

# Skip emitting this wrapper. Pass attribution as meta for child.

child_meta = meta_from_node or body_text_collapsed

# Recurse into child as the SAME level (replacing this wrapper)

_walk_with_meta(direct_nested[0], level, child_meta)

return

turns.append({"level": level, "body_html": body_html, "meta": meta_from_node})

for n in direct_nested:

_walk(n, level + 1)

def _walk_with_meta(node, level: int, forced_meta: str):

"""Variant that uses a passed-in meta when the node's own meta is empty."""

meta_from_node = _extract_quote_meta(str(node)) or forced_meta

nested = [t for t in node.find_all(True, recursive=True) if _is_quote_container(t)]

def has_quote_between(child, ancestor) -> bool:

p = child.parent

while p is not None and p is not ancestor:

if _is_quote_container(p):

return True

p = p.parent

return False

direct_nested = [n for n in nested if not has_quote_between(n, node)]

for n in list(direct_nested):

n.extract()

body_html = node.decode_contents()

turns.append({"level": level, "body_html": body_html, "meta": meta_from_node})

for n in direct_nested:

_walk(n, level + 1)

for bq in tops:

_walk(bq, 1)

if not turns:

return None

return turns

def parse_thread(body_html: str | None, body_text: str | None) -> list[dict[str, Any]] | None:

"""Public entry point. Prefer HTML when available, else plaintext.

Returns None if no quoted material found (caller renders flat)."""

if isinstance(body_html, str) and body_html:

out = _parse_html(body_html)

if out:

return out

if isinstance(body_text, str) and body_text:

return _parse_plaintext(body_text)

return None

odysseus/src/email_thread_parser.py at dev · odysseus-dev/odysseus · GitHub

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