overleaf/services/web/app/coffee/Features/Documents/DocumentHelper.coffee

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module.exports = DocumentHelper =
getTitleFromTexContent: (content, maxContentToScan = 30000) ->
TITLE_WITH_CURLY_BRACES = /\\[tT]itle\*?\s*{([^}]+)}/
TITLE_WITH_SQUARE_BRACES = /\\[tT]itle\s*\[([^\]]+)\]/
ESCAPED_BRACES = /\\([{}\[\]])/g
for line in DocumentHelper._getLinesFromContent(content, maxContentToScan)
match = line.match(TITLE_WITH_SQUARE_BRACES) || line.match(TITLE_WITH_CURLY_BRACES)
if match?
return match[1].replace(ESCAPED_BRACES, (br)->br[1])
return null
contentHasDocumentclass: (content, maxContentToScan = 30000) ->
for line in DocumentHelper._getLinesFromContent(content, maxContentToScan)
# We've had problems with this regex locking up CPU.
# Previously /.*\\documentclass/ would totally lock up on lines of 500kb (data text files :()
# This regex will only look from the start of the line, including whitespace so will return quickly
# regardless of line length.
return true if line.match /^\s*\\documentclass/
return false
_getLinesFromContent: (content, maxContentToScan) ->
return if typeof content is 'string' then content.substring(0, maxContentToScan).split("\n") else content