diff options
Diffstat (limited to 'app/lib')
| -rw-r--r-- | app/lib/frontmatter_handler.rb | 223 |
1 files changed, 0 insertions, 223 deletions
diff --git a/app/lib/frontmatter_handler.rb b/app/lib/frontmatter_handler.rb deleted file mode 100644 index fa787630d..000000000 --- a/app/lib/frontmatter_handler.rb +++ /dev/null @@ -1,223 +0,0 @@ -# frozen_string_literal: true - -require 'singleton' - -# See also `app/javascript/features/account/util/bio_metadata.js`. - -class FrontmatterHandler - include Singleton - - # CONVENIENCE FUNCTIONS # - - def self.unirex(str) - Regexp.new str, Regexp::MULTILINE - end - def self.rexstr(exp) - '(?:' + exp.source + ')' - end - - # CHARACTER CLASSES # - - DOCUMENT_START = /^/ - DOCUMENT_END = /$/ - ALLOWED_CHAR = # c-printable` in the YAML 1.2 spec. - /[\t\n\r\u{20}-\u{7e}\u{85}\u{a0}-\u{d7ff}\u{e000}-\u{fffd}\u{10000}-\u{10ffff}]/u - WHITE_SPACE = /[ \t]/ - INDENTATION = / */ - LINE_BREAK = /\r?\n|\r|<br\s*\/?>/ - ESCAPE_CHAR = /[0abt\tnvfre "\/\\N_LP]/ - HEXADECIMAL_CHARS = /[0-9a-fA-F]/ - INDICATOR = /[-?:,\[\]{}&#*!|>'"%@`]/ - FLOW_CHAR = /[,\[\]{}]/ - - # NEGATED CHARACTER CLASSES # - - NOT_WHITE_SPACE = unirex '(?!' + rexstr(WHITE_SPACE) + ').' - NOT_LINE_BREAK = unirex '(?!' + rexstr(LINE_BREAK) + ').' - NOT_INDICATOR = unirex '(?!' + rexstr(INDICATOR) + ').' - NOT_FLOW_CHAR = unirex '(?!' + rexstr(FLOW_CHAR) + ').' - NOT_ALLOWED_CHAR = unirex '(?!' + rexstr(ALLOWED_CHAR) + ').' - - # BASIC CONSTRUCTS # - - ANY_WHITE_SPACE = unirex rexstr(WHITE_SPACE) + '*' - ANY_ALLOWED_CHARS = unirex rexstr(ALLOWED_CHAR) + '*' - NEW_LINE = unirex( - rexstr(ANY_WHITE_SPACE) + rexstr(LINE_BREAK) - ) - SOME_NEW_LINES = unirex( - '(?:' + rexstr(ANY_WHITE_SPACE) + rexstr(LINE_BREAK) + ')+' - ) - POSSIBLE_STARTS = unirex( - rexstr(DOCUMENT_START) + rexstr(/<p[^<>]*>/) + '?' - ) - POSSIBLE_ENDS = unirex( - rexstr(SOME_NEW_LINES) + '|' + - rexstr(DOCUMENT_END) + '|' + - rexstr(/<\/p>/) - ) - CHARACTER_ESCAPE = unirex( - rexstr(/\\/) + - '(?:' + - rexstr(ESCAPE_CHAR) + '|' + - rexstr(/x/) + rexstr(HEXADECIMAL_CHARS) + '{2}' + '|' + - rexstr(/u/) + rexstr(HEXADECIMAL_CHARS) + '{4}' + '|' + - rexstr(/U/) + rexstr(HEXADECIMAL_CHARS) + '{8}' + - ')' - ) - ESCAPED_CHAR = unirex( - rexstr(/(?!["\\])/) + rexstr(NOT_LINE_BREAK) + '|' + - rexstr(CHARACTER_ESCAPE) - ) - ANY_ESCAPED_CHARS = unirex( - rexstr(ESCAPED_CHAR) + '*' - ) - ESCAPED_APOS = unirex( - '(?=' + rexstr(NOT_LINE_BREAK) + ')' + rexstr(/[^']|''/) - ) - ANY_ESCAPED_APOS = unirex( - rexstr(ESCAPED_APOS) + '*' - ) - FIRST_KEY_CHAR = unirex( - '(?=' + rexstr(NOT_LINE_BREAK) + ')' + - '(?=' + rexstr(NOT_WHITE_SPACE) + ')' + - rexstr(NOT_INDICATOR) + '|' + - rexstr(/[?:-]/) + - '(?=' + rexstr(NOT_LINE_BREAK) + ')' + - '(?=' + rexstr(NOT_WHITE_SPACE) + ')' + - '(?=' + rexstr(NOT_FLOW_CHAR) + ')' - ) - FIRST_VALUE_CHAR = unirex( - '(?=' + rexstr(NOT_LINE_BREAK) + ')' + - '(?=' + rexstr(NOT_WHITE_SPACE) + ')' + - rexstr(NOT_INDICATOR) + '|' + - rexstr(/[?:-]/) + - '(?=' + rexstr(NOT_LINE_BREAK) + ')' + - '(?=' + rexstr(NOT_WHITE_SPACE) + ')' - # Flow indicators are allowed in values. - ) - LATER_KEY_CHAR = unirex( - rexstr(WHITE_SPACE) + '|' + - '(?=' + rexstr(NOT_LINE_BREAK) + ')' + - '(?=' + rexstr(NOT_WHITE_SPACE) + ')' + - '(?=' + rexstr(NOT_FLOW_CHAR) + ')' + - rexstr(/[^:#]#?/) + '|' + - rexstr(/:/) + '(?=' + rexstr(NOT_WHITE_SPACE) + ')' - ) - LATER_VALUE_CHAR = unirex( - rexstr(WHITE_SPACE) + '|' + - '(?=' + rexstr(NOT_LINE_BREAK) + ')' + - '(?=' + rexstr(NOT_WHITE_SPACE) + ')' + - # Flow indicators are allowed in values. - rexstr(/[^:#]#?/) + '|' + - rexstr(/:/) + '(?=' + rexstr(NOT_WHITE_SPACE) + ')' - ) - - # YAML CONSTRUCTS # - - YAML_START = unirex( - rexstr(ANY_WHITE_SPACE) + rexstr(/---/) - ) - YAML_END = unirex( - rexstr(ANY_WHITE_SPACE) + rexstr(/(?:---|\.\.\.)/) - ) - YAML_LOOKAHEAD = unirex( - '(?=' + - rexstr(YAML_START) + - rexstr(ANY_ALLOWED_CHARS) + rexstr(NEW_LINE) + - rexstr(YAML_END) + rexstr(POSSIBLE_ENDS) + - ')' - ) - YAML_DOUBLE_QUOTE = unirex( - rexstr(/"/) + rexstr(ANY_ESCAPED_CHARS) + rexstr(/"/) - ) - YAML_SINGLE_QUOTE = unirex( - rexstr(/'/) + rexstr(ANY_ESCAPED_APOS) + rexstr(/'/) - ) - YAML_SIMPLE_KEY = unirex( - rexstr(FIRST_KEY_CHAR) + rexstr(LATER_KEY_CHAR) + '*' - ) - YAML_SIMPLE_VALUE = unirex( - rexstr(FIRST_VALUE_CHAR) + rexstr(LATER_VALUE_CHAR) + '*' - ) - YAML_KEY = unirex( - rexstr(YAML_DOUBLE_QUOTE) + '|' + - rexstr(YAML_SINGLE_QUOTE) + '|' + - rexstr(YAML_SIMPLE_KEY) - ) - YAML_VALUE = unirex( - rexstr(YAML_DOUBLE_QUOTE) + '|' + - rexstr(YAML_SINGLE_QUOTE) + '|' + - rexstr(YAML_SIMPLE_VALUE) - ) - YAML_SEPARATOR = unirex( - rexstr(ANY_WHITE_SPACE) + - ':' + rexstr(WHITE_SPACE) + - rexstr(ANY_WHITE_SPACE) - ) - YAML_LINE = unirex( - '(' + rexstr(YAML_KEY) + ')' + - rexstr(YAML_SEPARATOR) + - '(' + rexstr(YAML_VALUE) + ')' - ) - - # FRONTMATTER REGEX # - - YAML_FRONTMATTER = unirex( - rexstr(POSSIBLE_STARTS) + - rexstr(YAML_LOOKAHEAD) + - rexstr(YAML_START) + rexstr(SOME_NEW_LINES) + - '(?:' + - '(' + rexstr(INDENTATION) + ')' + - rexstr(YAML_LINE) + rexstr(SOME_NEW_LINES) + - '(?:' + - '\\1' + rexstr(YAML_LINE) + rexstr(SOME_NEW_LINES) + - '){0,4}' + - ')?' + - rexstr(YAML_END) + rexstr(POSSIBLE_ENDS) - ) - - # SEARCHES # - - FIND_YAML_LINES = unirex( - rexstr(NEW_LINE) + rexstr(INDENTATION) + rexstr(YAML_LINE) - ) - - # STRING PROCESSING # - - def process_string(str) - case str[0] - when '"' - str[1..-2] - when "'" - str[1..-2].gsub(/''/, "'") - else - str - end - end - - # BIO PROCESSING # - - def process_bio content - result = { - text: content.gsub(/"/, '"').gsub(/'/, "'"), - metadata: [] - } - yaml = YAML_FRONTMATTER.match(result[:text]) - return result unless yaml - yaml = yaml[0] - start = YAML_START =~ result[:text] - ending = start + yaml.length - (YAML_START =~ yaml) - result[:text][start..ending - 1] = '' - metadata = nil - index = 0 - while metadata = FIND_YAML_LINES.match(yaml, index) do - index = metadata.end(0) - result[:metadata].push [ - process_string(metadata[1]), process_string(metadata[2]) - ] - end - return result - end - -end |