mirror of https://gitlab.com/bashrc2/epicyon
314 lines
9.0 KiB
Python
314 lines
9.0 KiB
Python
__filename__ = "markdown.py"
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__author__ = "Bob Mottram"
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__license__ = "AGPL3+"
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__version__ = "1.3.0"
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__maintainer__ = "Bob Mottram"
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__email__ = "bob@libreserver.org"
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__status__ = "Production"
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__module_group__ = "Web Interface"
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def _markdown_emphasis_html(markdown: str) -> str:
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"""Add italics and bold html markup to the given markdown
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"""
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replacements = {
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' **': ' <b>',
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'** ': '</b> ',
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'**.': '</b>.',
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'**:': '</b>:',
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'**;': '</b>;',
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'**,': '</b>,',
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'**\n': '</b>\n',
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'>**': '><b>',
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'**<': '</b><',
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'>*': '><i>',
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'*<': '</i><',
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' *': ' <i>',
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'* ': '</i> ',
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'*.': '</i>.',
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'*:': '</i>:',
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'*;': '</i>;',
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'*,': '</i>,',
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'*\n': '</i>\n',
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' _': ' <ul>',
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'_ ': '</ul> ',
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'_.': '</ul>.',
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'_:': '</ul>:',
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'_;': '</ul>;',
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'_,': '</ul>,',
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'_\n': '</ul>\n',
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' `': ' <em>',
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'`.': '</em>.',
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'`:': '</em>:',
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'`;': '</em>;',
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'`\n': '</em>\n',
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'` ': '</em> '
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}
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for md_str, html in replacements.items():
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markdown = markdown.replace(md_str, html)
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if markdown.startswith('**'):
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markdown = markdown[2:] + '<b>'
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elif markdown.startswith('*'):
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markdown = markdown[1:] + '<i>'
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elif markdown.startswith('_'):
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markdown = markdown[1:] + '<ul>'
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if markdown.endswith('**'):
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markdown = markdown[:len(markdown) - 2] + '</b>'
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elif markdown.endswith('*'):
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markdown = markdown[:len(markdown) - 1] + '</i>'
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elif markdown.endswith('_'):
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markdown = markdown[:len(markdown) - 1] + '</ul>'
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return markdown
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def _markdown_replace_quotes(markdown: str) -> str:
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"""Replaces > quotes with html blockquote
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"""
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if '> ' not in markdown:
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return markdown
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lines = markdown.split('\n')
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result = ''
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prev_quote_line = None
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code_section = False
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for line in lines:
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# avoid code sections
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if not code_section:
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if '<code>' in line:
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code_section = True
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else:
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if '</code>' in line:
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code_section = False
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if code_section:
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result += line + '\n'
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continue
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if '> ' not in line:
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result += line + '\n'
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prev_quote_line = None
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continue
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line_str = line.strip()
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if not line_str.startswith('> '):
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result += line + '\n'
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prev_quote_line = None
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continue
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line_str = line_str.replace('> ', '', 1).strip()
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if prev_quote_line:
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new_prev_line = prev_quote_line.replace('</i></blockquote>\n', '')
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result = result.replace(prev_quote_line, new_prev_line) + ' '
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line_str += '</i></blockquote>\n'
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else:
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line_str = '<blockquote><i>' + line_str + '</i></blockquote>\n'
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result += line_str
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prev_quote_line = line_str
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if '</blockquote>\n' in result:
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result = result.replace('</blockquote>\n', '</blockquote>')
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if result.endswith('\n') and \
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not markdown.endswith('\n'):
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result = result[:len(result) - 1]
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return result
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def _markdown_replace_links(markdown: str, images: bool = False) -> str:
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"""Replaces markdown links with html
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Optionally replace image links
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"""
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replace_links = {}
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text = markdown
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start_chars = '['
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if images:
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start_chars = '!['
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while start_chars in text:
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if ')' not in text:
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break
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text = text.split(start_chars, 1)[1]
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markdown_link = start_chars + text.split(')')[0] + ')'
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if ']' not in markdown_link or \
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'(' not in markdown_link:
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text = text.split(')', 1)[1]
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continue
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if not images:
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replace_links[markdown_link] = \
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'<a href="' + \
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markdown_link.split('(')[1].split(')')[0] + \
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'" target="_blank" rel="nofollow noopener noreferrer">' + \
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markdown_link.split(start_chars)[1].split(']')[0] + \
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'</a>'
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else:
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replace_links[markdown_link] = \
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'<img class="markdownImage" src="' + \
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markdown_link.split('(')[1].split(')')[0] + \
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'" alt="' + \
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markdown_link.split(start_chars)[1].split(']')[0] + \
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'" />'
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text = text.split(')', 1)[1]
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for md_link, html_link in replace_links.items():
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lines = markdown.split('\n')
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markdown = ''
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code_section = False
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ctr = 0
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for line in lines:
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if ctr > 0:
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markdown += '\n'
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# avoid code sections
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if not code_section:
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if '<code>' in line:
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code_section = True
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else:
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if '</code>' in line:
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code_section = False
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if code_section:
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markdown += line
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ctr += 1
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continue
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markdown += line.replace(md_link, html_link)
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ctr += 1
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return markdown
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def _markdown_replace_bullet_points(markdown: str) -> str:
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"""Replaces bullet points
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"""
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lines = markdown.split('\n')
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bullet_style = ('* ', ' * ', '- ', ' - ')
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bullet_matched = ''
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start_line = -1
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line_ctr = 0
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changed = False
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code_section = False
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for line in lines:
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if not line.strip():
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# skip blank lines
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line_ctr += 1
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continue
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# skip over code sections
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if not code_section:
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if '<code>' in line:
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code_section = True
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else:
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if '</code>' in line:
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code_section = False
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if code_section:
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line_ctr += 1
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continue
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if not bullet_matched:
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for test_str in bullet_style:
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if line.startswith(test_str):
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bullet_matched = test_str
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start_line = line_ctr
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break
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else:
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if not line.startswith(bullet_matched):
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for index in range(start_line, line_ctr):
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line_text = lines[index].replace(bullet_matched, '', 1)
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if index == start_line:
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lines[index] = '<ul>\n<li>' + line_text + '</li>'
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elif index == line_ctr - 1:
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lines[index] = '<li>' + line_text + '</li>\n</ul>'
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else:
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lines[index] = '<li>' + line_text + '</li>'
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changed = True
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start_line = -1
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bullet_matched = ''
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line_ctr += 1
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if not changed:
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return markdown
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markdown = ''
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for line in lines:
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markdown += line + '\n'
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return markdown
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def _markdown_replace_code(markdown: str) -> str:
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"""Replaces code sections within markdown
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"""
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lines = markdown.split('\n')
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start_line = -1
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line_ctr = 0
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changed = False
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section_active = False
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for line in lines:
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if not line.strip():
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# skip blank lines
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line_ctr += 1
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continue
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if line.startswith('```'):
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if not section_active:
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start_line = line_ctr
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section_active = True
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else:
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lines[start_line] = '<code>'
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lines[line_ctr] = '</code>'
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section_active = False
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changed = True
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line_ctr += 1
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if not changed:
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return markdown
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markdown = ''
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for line in lines:
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markdown += line + '\n'
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return markdown
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def markdown_to_html(markdown: str) -> str:
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"""Converts markdown formatted text to html
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"""
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markdown = _markdown_replace_code(markdown)
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markdown = _markdown_replace_bullet_points(markdown)
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markdown = _markdown_replace_quotes(markdown)
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markdown = _markdown_emphasis_html(markdown)
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markdown = _markdown_replace_links(markdown, True)
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markdown = _markdown_replace_links(markdown)
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# replace headers
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lines_list = markdown.split('\n')
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html_str = ''
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ctr = 0
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code_section = False
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titles = {
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"h5": '#####',
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"h4": '####',
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"h3": '###',
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"h2": '##',
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"h1": '#'
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}
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for line in lines_list:
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if ctr > 0:
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html_str += '<br>\n'
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# avoid code sections
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if not code_section:
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if '<code>' in line:
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code_section = True
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else:
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if '</code>' in line:
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code_section = False
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if code_section:
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html_str += line
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ctr += 1
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continue
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for hsh, hashes in titles.items():
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if line.startswith(hashes):
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line = line.replace(hashes, '').strip()
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line = '<' + hsh + '>' + line + '</' + hsh + '>\n'
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ctr = -1
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break
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html_str += line
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ctr += 1
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html_str = html_str.replace('<code><br>', '<code>')
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html_str = html_str.replace('</code><br>', '</code>')
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return html_str
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