Class: Cosensee::LineParser

Inherits:
Object
  • Object
show all
Defined in:
lib/cosensee/line_parser.rb

Overview

parse a line

Constant Summary collapse

INDENT_PATTERN = 
/\A([\t ]*)(.*)\z/
QUOTE_PATTERN = 
/\A(>)(.*)\z/
CODEBLOCK_PATTERN = 
/\A(code:)(.+)\z/
COMMANDLINE_PATTERN = 
/\A([$%]) (.+)\z/

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ LineParser

Returns a new instance of LineParser.



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# File 'lib/cosensee/line_parser.rb', line 30

def initialize
  @bracket_parser = Cosensee::BracketParser.new
end

Class Method Details

.merge_blocks(lines) ⇒ Object 



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# File 'lib/cosensee/line_parser.rb', line 17

def self.merge_blocks(lines)
  prev_line = nil
  lines.each_with_object([]) do |line, result|
    if prev_line&.codeblock? && prev_line.indent_level < line.indent_level
      text = line.raw[prev_line.indent_level..]
      prev_line.append_text(text:, raw_line: line.raw)
    else
      result << line
      prev_line = line
    end
  end
end

.parse(line) ⇒ Object 



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# File 'lib/cosensee/line_parser.rb', line 13

def self.parse(line)
  new.parse(line)
end

Instance Method Details

#clean_elements(elements) ⇒ Object 



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# File 'lib/cosensee/line_parser.rb', line 252

def clean_elements(elements)
  fixed = []
  elements.each do |elem|
    last_elem = fixed.last
    if last_elem.is_a?(String) && elem.is_a?(String)
      fixed[-1] = "#{last_elem}#{elem}"
    else
      fixed << elem
    end
  end

  fixed.filter { |elem| !elem.nil? && elem != '' }
end

#done_parsing(line) ⇒ Object 



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# File 'lib/cosensee/line_parser.rb', line 243

def done_parsing(line)
  # If the line_content is Cosensee::Node::Quote, move content into it.
  if line.line_content.is_a?(Cosensee::Node::Quote)
    new_quote = line.line_content.replace_content(line.content)
    line.update(line_content: new_quote, content: [])
  end
  line.update(parsed: true)
end

#parse(line) ⇒ Object 



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# File 'lib/cosensee/line_parser.rb', line 34

def parse(line)
  parsed_line = ParsedLine.new(rest: line, raw: line)
  parsed_line
    .then { parse_indent(it) }
    .then { parse_whole_line(it) }
    .then { parse_code(it) }
    .then { parse_double_bracket(it) }
    .then { parse_bracket(it) }
    .then { parse_url(it) }
    .then { parse_hashtag(it) }
    .then { done_parsing(it) }
end

#parse_bracket(line) ⇒ Object 



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# File 'lib/cosensee/line_parser.rb', line 192

def parse_bracket(line)
  return line if line.parsed?

  parsed = []
  stack = nil
  target_char = '[' # or "]"

  line.content.each do |elem|
    case elem
    when Cosensee::Node::Code, Cosensee::Node::DoubleBracket
      if target_char == '['
        parsed << elem
      else
        stack << elem
      end
    else # elem is String
      loop do
        n = elem.index(target_char)
        if n
          if target_char == '['
            parsed << elem[0, n]
            target_char = ']'
            stack = []
          else
            stack << elem[0, n]
            target_char = '['
            parsed << @bracket_parser.parse(stack)
            stack = nil
          end
          elem = elem[(n + 1)..]
        else
          if target_char == '['
            parsed << elem
          else
            stack << elem
          end
          break
        end
      end
    end
  end

  if stack
    # parsed += ['['] + stack
    parsed << '['
    parsed.concat(stack)
  end

  line.update(content: clean_elements(parsed))
end

#parse_code(line) ⇒ Object 



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# File 'lib/cosensee/line_parser.rb', line 83

def parse_code(line)
  return line if line.parsed?

  parsed = []
  strs = line.split_rest_by('`')
  loop do
    str = strs.shift
    unless str
      return line.update(rest: nil,
                         content: parsed)
    end

    parsed << str

    str = strs.shift
    unless str
      line.update(rest: nil,
                  content: parsed)
      return line
    end

    if strs.empty?
      parsed.last.concat("`#{str}")
      return line.update(rest: nil,
                         content: parsed)
    else
      parsed << Node::Code.new(str, "`#{str}`")
    end
  end
end

#parse_double_bracket(line) ⇒ Object 



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# File 'lib/cosensee/line_parser.rb', line 166

def parse_double_bracket(line)
  return line if line.parsed?

  parsed = []

  line.content.each do |elem|
    if elem.is_a?(String)
      loop do
        matched = elem.match(/\[\[(.+?)\]\]/)
        if matched
          parsed << matched.pre_match
          parsed << Cosensee::Node::DoubleBracket.new(content: [matched[1]], raw: matched[0])
          elem = matched.post_match
        else
          parsed << elem
          break # loop
        end
      end
    else
      parsed << elem
    end
  end

  line.update(content: clean_elements(parsed))
end

#parse_hashtag(line) ⇒ Object 



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# File 'lib/cosensee/line_parser.rb', line 114

def parse_hashtag(line)
  return line if line.parsed?

  parsed = []

  line.content.each do |elem|
    if elem.is_a?(String)
      loop do
        matched = elem.match(/(^|\s)#(\S+)/)
        if matched
          parsed << "#{matched.pre_match}#{matched[1]}"
          parsed << Cosensee::Node::HashTag.new(content: matched[2], raw: "##{matched[2]}")
          elem = matched.post_match
        else
          parsed << elem
          break # loop
        end
      end
    else
      parsed << elem
    end
  end

  line.update(content: clean_elements(parsed))
end

#parse_indent(line) ⇒ Object 



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# File 'lib/cosensee/line_parser.rb', line 47

def parse_indent(line)
  matched = line.match(INDENT_PATTERN)
  ParsedLine.new(indent: Cosensee::Node::Indent.new(matched[1], matched[1]),
                 rest: matched[2], raw: line.raw)
end

#parse_url(line) ⇒ Object 



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# File 'lib/cosensee/line_parser.rb', line 140

def parse_url(line)
  return line if line.parsed?

  parsed = []

  line.content.each do |elem|
    if elem.is_a?(String)
      loop do
        matched = elem.match(%r{(^|.*?)(https?://[^\s]+)})
        if matched
          parsed << "#{matched.pre_match}#{matched[1]}"
          parsed << Cosensee::Node::Link.new(matched[2], matched[2])
          elem = matched.post_match
        else
          parsed << elem
          break # loop
        end
      end
    else
      parsed << elem
    end
  end

  line.update(content: clean_elements(parsed))
end

#parse_whole_line(line) ⇒ Object 



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# File 'lib/cosensee/line_parser.rb', line 53

def parse_whole_line(line)
  # parse quote
  matched = line.match(QUOTE_PATTERN)
  if matched
    line.update(rest: matched[2],
                line_content: Cosensee::Node::Quote.new(content: nil, raw: matched[0], mark: matched[1]))
    return line
  end

  # parse codeblock
  matched = line.match(CODEBLOCK_PATTERN)
  if matched
    return line.update(rest: nil,
                       line_content: Cosensee::Node::Codeblock.new(content: '', name: matched[2], raw: matched[0]),
                       parsed: true)
  end

  # parse command line
  matched = line.match(COMMANDLINE_PATTERN)
  if matched
    return line.update(rest: nil,
                       line_content: Cosensee::Node::CommandLine.new(content: matched[2],
                                                                     prompt: matched[1],
                                                                     raw: matched[0]),
                       parsed: true)
  end

  line
end