# -*- coding: utf-8; frozen_string_literal: true -*- # #-- # Copyright (C) 2009-2019 Thomas Leitner # # This file is part of kramdown which is licensed under the MIT. #++ # require 'kramdown/parser/kramdown/escaped_chars' module Kramdown module Parser class Kramdown # Parse the link at the current scanner position. This method is used to parse normal links as # well as image links, plain spans. def parse_link start_line_number = @src.current_line_number result = @src.scan(LINK_START) cur_pos = @src.pos saved_pos = @src.save_pos link_type = (result =~ /^!/ ? :img : :a) # no nested links allowed if link_type == :a && (@tree.type == :img || @tree.type == :a || @stack.any? {|t, _| t && (t.type == :img || t.type == :a) }) add_text(result) return end el = Element.new(link_type, nil, nil, location: start_line_number) count = 1 found = parse_spans(el, LINK_BRACKET_STOP_RE) do count += (@src[1] ? -1 : 1) count - el.children.select {|c| c.type == :img }.size == 0 end unless found @src.revert_pos(saved_pos) add_text(result) return end alt_text = extract_string(cur_pos...@src.pos, @src).gsub(ESCAPED_CHARS, '\1') @src.scan(LINK_BRACKET_STOP_RE) # reference style link or no link url if @src.scan(LINK_INLINE_ID_RE) || !@src.check(/\(/) emit_warning = !@src[1] link_id = normalize_link_id(@src[1] || alt_text) if @link_defs.key?(link_id) link_def = @link_defs[link_id] add_link(el, link_def[0], link_def[1], alt_text, link_def[2] && link_def[2].options[:ial]) else if emit_warning warning("No link definition for link ID '#{link_id}' found on line #{start_line_number}") end @src.revert_pos(saved_pos) if @src.check(/./) == ']' add_text(result) else parse_span end end return end # link url in parentheses if @src.scan(/\(<(.*?)>/) link_url = @src[1] if @src.scan(/\)/) add_link(el, link_url, nil, alt_text) return end else link_url = +'' nr_of_brackets = 0 while (temp = @src.scan_until(LINK_PAREN_STOP_RE)) link_url << temp if @src[2] nr_of_brackets -= 1 break if nr_of_brackets == 0 elsif @src[1] nr_of_brackets += 1 else break end end link_url = link_url[1..-2] link_url.strip! if nr_of_brackets == 0 add_link(el, link_url, nil, alt_text) return end end if @src.scan(LINK_INLINE_TITLE_RE) add_link(el, link_url, @src[2], alt_text) else @src.revert_pos(saved_pos) add_text(result) end end # define_parser(:link, LINK_START, '!?\[') end end end