Improve tweet url and hashtag parsing
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1 changed files with 112 additions and 52 deletions
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@ -1,4 +1,4 @@
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import strutils, times, macros, htmlgen, unicode, options
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import strutils, times, macros, htmlgen, unicode, options, algorithm
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import regex, packedjson
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import types, utils, formatters
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@ -6,9 +6,18 @@ const
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unRegex = re"(^|[^A-z0-9-_./?])@([A-z0-9_]{1,15})"
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unReplace = "$1<a href=\"/$2\">@$2</a>"
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htRegex = re"(^|[^\w-_./?])([#$])([\w_]+)"
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htRegex = re"(^|[^\w-_./?])([#＃$])([\w_]+)"
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htReplace = "$1<a href=\"/search?q=%23$3\">$2$3</a>"
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type
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ReplaceSliceKind = enum
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rkRemove, rkUrl, rkHashtag, rkMention
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ReplaceSlice = object
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slice: Slice[int]
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kind: ReplaceSliceKind
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url, display: string
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template isNull*(js: JsonNode): bool = js.kind == JNull
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template notNull*(js: JsonNode): bool = js.kind != JNull
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@ -124,65 +133,97 @@ proc getTombstone*(js: JsonNode): string =
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result = js{"tombstoneInfo", "richText", "text"}.getStr
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result.removeSuffix(" Learn more")
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template getSlice(text: string; slice: seq[int]): string =
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text.runeSubStr(slice[0], slice[1] - slice[0])
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proc getSlice(text: string; js: JsonNode): string =
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if js.kind != JArray or js.len < 2 or js[0].kind != JInt: return text
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let slice = @[js{0}.getInt, js{1}.getInt]
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text.getSlice(slice)
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proc expandUrl(text: var string; js: JsonNode; tLen: int; hideTwitter=false) =
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let u = js{"url"}.getStr
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if u.len == 0 or u notin text:
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return
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proc extractSlice(js: JsonNode): Slice[int] =
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result = js["indices"][0].getInt ..< js["indices"][1].getInt
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proc extractUrls(result: var seq[ReplaceSlice]; js: JsonNode;
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textLen: int; hideTwitter = false) =
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let
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url = js{"expanded_url"}.getStr
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slice = js{"indices"}[1].getInt
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url = js["expanded_url"].getStr
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slice = js.extractSlice
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if hideTwitter and slice >= tLen and url.isTwitterUrl:
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text = text.replace(u, "")
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text.removeSuffix(' ')
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text.removeSuffix('\n')
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if hideTwitter and slice.b.succ >= textLen and url.isTwitterUrl:
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if slice.a < textLen:
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result.add ReplaceSlice(kind: rkRemove, slice: slice)
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else:
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text = text.replace(u, a(shortLink(url), href=url))
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result.add ReplaceSlice(kind: rkUrl, url: url,
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display: url.shortLink, slice: slice)
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proc expandMention(text: var string; orig: string; js: JsonNode) =
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let
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name = js{"name"}.getStr
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href = '/' & js{"screen_name"}.getStr
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uname = orig.getSlice(js{"indices"})
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text = text.replace(uname, a(uname, href=href, title=name))
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proc extractHashtags(result: var seq[ReplaceSlice]; js: JsonNode) =
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result.add ReplaceSlice(kind: rkHashtag, slice: js.extractSlice)
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proc replacedWith(runes: seq[Rune]; repls: openArray[ReplaceSlice];
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textSlice: Slice[int]): string =
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template extractLowerBound(i: int; idx): int =
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if i > 0: repls[idx].slice.b.succ else: textSlice.a
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result = newStringOfCap(runes.len)
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var upperBound = textSlice.b
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for i, rep in repls:
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result.add $runes[extractLowerBound(i, i - 1) ..< rep.slice.a]
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case rep.kind
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of rkHashtag:
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let
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name = $runes[rep.slice.a.succ .. rep.slice.b]
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symbol = $runes[rep.slice.a]
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result.add a(symbol & name, href = "/search?q=%23" & name)
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of rkMention:
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result.add a($runes[rep.slice], href = rep.url, title = rep.display)
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of rkUrl:
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result.add a(rep.display, href = rep.url)
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of rkRemove:
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discard
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let rest = extractLowerBound(repls.len, ^1) ..< textSlice.b
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if rest.a <= rest.b:
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result.add $runes[rest]
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proc deduplicate(s: var seq[ReplaceSlice]) =
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var
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len = s.len
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i = 0
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while i < len:
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var j = i + 1
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while j < len:
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if s[i].slice.a == s[j].slice.a:
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s.del j
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dec len
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else:
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inc j
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inc i
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proc cmp(x, y: ReplaceSlice): int = cmp(x.slice.a, y.slice.b)
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proc expandProfileEntities*(profile: var Profile; js: JsonNode) =
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let
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orig = profile.bio
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orig = profile.bio.toRunes
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ent = ? js{"entities"}
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with urls, ent{"url", "urls"}:
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profile.website = urls[0]{"expanded_url"}.getStr
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with urls, ent{"description", "urls"}:
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for u in urls: profile.bio.expandUrl(u, orig.high)
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var replacements = newSeq[ReplaceSlice]()
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with urls, ent{"description", "urls"}:
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for u in urls:
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replacements.extractUrls(u, orig.high)
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replacements.deduplicate
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replacements.sort(cmp)
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profile.bio = orig.replacedWith(replacements, 0 .. orig.len)
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profile.bio = profile.bio.replace(unRegex, unReplace)
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.replace(htRegex, htReplace)
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for mention in ? ent{"user_mentions"}:
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profile.bio.expandMention(orig, mention)
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proc expandTweetEntities*(tweet: Tweet; js: JsonNode) =
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let
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orig = tweet.text
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orig = tweet.text.toRunes
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textRange = js{"display_text_range"}
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slice = @[textRange{0}.getInt, textRange{1}.getInt]
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textSlice = textRange{0}.getInt .. textRange{1}.getInt
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hasQuote = js{"is_quote_status"}.getBool
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hasCard = tweet.card.isSome
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tweet.text = tweet.text.getSlice(slice)
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var replyTo = ""
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if tweet.replyId != 0:
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with reply, js{"in_reply_to_screen_name"}:
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@ -191,26 +232,45 @@ proc expandTweetEntities*(tweet: Tweet; js: JsonNode) =
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let ent = ? js{"entities"}
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var replacements = newSeq[ReplaceSlice]()
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with urls, ent{"urls"}:
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for u in urls:
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tweet.text.expandUrl(u, slice[1], hasQuote)
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let urlStr = u["url"].getStr
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if urlStr.len == 0 or urlStr notin tweet.text:
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continue
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replacements.extractUrls(u, textSlice.b, hideTwitter = hasQuote)
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if hasCard and u{"url"}.getStr == get(tweet.card).url:
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get(tweet.card).url = u{"expanded_url"}.getStr
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with media, ent{"media"}:
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for m in media: tweet.text.expandUrl(m, slice[1], hideTwitter=true)
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for m in media:
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replacements.extractUrls(m, textSlice.b, hideTwitter = true)
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if "hashtags" in ent or "symbols" in ent:
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tweet.text = tweet.text.replace(htRegex, htReplace)
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if "hashtags" in ent:
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for hashtag in ent["hashtags"]:
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replacements.extractHashtags(hashtag)
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for mention in ? ent{"user_mentions"}:
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let
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name = mention{"screen_name"}.getStr
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idx = tweet.reply.find(name)
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if "symbols" in ent:
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for symbol in ent["symbols"]:
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replacements.extractHashtags(symbol)
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if mention{"indices"}[0].getInt >= slice[0]:
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tweet.text.expandMention(orig, mention)
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if idx > -1 and name != replyTo:
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tweet.reply.delete idx
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elif idx == -1 and tweet.replyId != 0:
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tweet.reply.add name
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if "user_mentions" in ent:
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for mention in ent["user_mentions"]:
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let
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name = mention{"screen_name"}.getStr
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slice = mention.extractSlice
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idx = tweet.reply.find(name)
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if slice.a >= textSlice.a:
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replacements.add ReplaceSlice(kind: rkMention, slice: slice,
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url: "/" & name, display: mention["name"].getStr)
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if idx > -1 and name != replyTo:
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tweet.reply.delete idx
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elif idx == -1 and tweet.replyId != 0:
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tweet.reply.add name
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replacements.deduplicate
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replacements.sort(cmp)
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tweet.text = orig.replacedWith(replacements, textSlice)
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