84 lines
3.1 KiB
Python
84 lines
3.1 KiB
Python
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# Copyright lowRISC contributors.
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# Licensed under the Apache License, Version 2.0, see LICENSE for details.
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# SPDX-License-Identifier: Apache-2.0
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import logging as log
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import re
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from typing import List, Match, Optional, Set
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def expand_paras(s: str, rnames: Set[str]) -> List[str]:
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'''Expand a description field to HTML.
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This supports a sort of simple pseudo-markdown. Supported Markdown
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features:
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- Separate paragraphs on a blank line
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- **bold** and *italicised* text
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- Back-ticks for pre-formatted text
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We also generate links to registers when a name is prefixed with a double
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exclamation mark. For example, if there is a register FOO then !!FOO or
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!!FOO.field will generate a link to that register.
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Returns a list of rendered paragraphs
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'''
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# Start by splitting into paragraphs. The regex matches a newline followed
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# by one or more lines that just contain whitespace. Then render each
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# paragraph with the _expand_paragraph worker function.
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paras = [_expand_paragraph(paragraph.strip(), rnames)
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for paragraph in re.split(r'\n(?:\s*\n)+', s)]
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# There will always be at least one paragraph (splitting an empty string
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# gives [''])
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assert paras
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return paras
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def _expand_paragraph(s: str, rnames: Set[str]) -> str:
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'''Expand a single paragraph, as described in _get_desc_paras'''
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def fieldsub(match: Match[str]) -> str:
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base = match.group(1).partition('.')[0].lower()
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if base in rnames:
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if match.group(1)[-1] == ".":
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return ('<a href="#Reg_' + base + '"><code class=\"reg\">' +
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match.group(1)[:-1] + '</code></a>.')
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else:
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return ('<a href="#Reg_' + base + '"><code class=\"reg\">' +
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match.group(1) + '</code></a>')
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log.warn('!!' + match.group(1).partition('.')[0] +
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' not found in register list.')
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return match.group(0)
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# Split out pre-formatted text. Because the call to re.split has a capture
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# group in the regex, we get an odd number of results. Elements with even
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# indices are "normal text". Those with odd indices are the captured text
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# between the back-ticks.
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code_split = re.split(r'`([^`]+)`', s)
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expanded_parts = []
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for idx, part in enumerate(code_split):
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if idx & 1:
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# Text contained in back ticks
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expanded_parts.append('<code>{}</code>'.format(part))
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continue
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part = re.sub(r"!!([A-Za-z0-9_.]+)", fieldsub, part)
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part = re.sub(r"(?s)\*\*(.+?)\*\*", r'<B>\1</B>', part)
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part = re.sub(r"\*([^*]+?)\*", r'<I>\1</I>', part)
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expanded_parts.append(part)
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return '<p>{}</p>'.format(''.join(expanded_parts))
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def render_td(s: str, rnames: Set[str], td_class: Optional[str]) -> str:
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'''Expand a description field and put it in a <td>.
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Returns a string. See _get_desc_paras for the format that gets expanded.
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'''
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desc_paras = expand_paras(s, rnames)
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class_attr = '' if td_class is None else ' class="{}"'.format(td_class)
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return '<td{}>{}</td>'.format(class_attr, ''.join(desc_paras))
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