114 lines
3.3 KiB
Python
114 lines
3.3 KiB
Python
"""Micron emitter — read CharGrid and output Micron markup with style tags.
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Scans each line left-to-right, tracks style state, and opens/closes
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Micron format codes at style transitions. Box-drawing characters pass
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through as literal text.
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Micron format reference:
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`!bold`! `*italic`* `_underline`_
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`Fhex text`f `Bhex text`b
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`c center`a `r right`a
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[label`dest] [label`dest.mu]
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>H1 >>H2 >>>H3
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"""
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from __future__ import annotations
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from uframe.grid import CharGrid, CellStyle
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from uframe.ir import Page, Heading, HeadingLevel
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def _emit_style_open(style: CellStyle) -> str:
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"""Emit Micron opening tags for a style."""
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tags: list[str] = []
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if style.bold:
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tags.append("`!")
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if style.italic:
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tags.append("`*")
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if style.underline:
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tags.append("`_")
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if style.fg:
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tags.append(f"`F{style.fg}")
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if style.bg:
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tags.append(f"`B{style.bg}")
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return "".join(tags)
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def _emit_style_close(style: CellStyle) -> str:
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"""Emit Micron closing tags for a style (in reverse order)."""
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tags: list[str] = []
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if style.bg:
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tags.append("`b")
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if style.fg:
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tags.append("`f")
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if style.underline:
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tags.append("`_")
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if style.italic:
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tags.append("`*")
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if style.bold:
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tags.append("`!")
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return "".join(tags)
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_EMPTY_STYLE = CellStyle()
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def emit_micron(grid: CharGrid, page_title: str = "") -> str:
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"""Emit the CharGrid as Micron markup."""
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lines: list[str] = []
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for row in range(grid.height):
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line_parts: list[str] = []
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cur_style = _EMPTY_STYLE
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in_link: str | None = None
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for col in range(grid.width):
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cell = grid.cells[row][col]
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ch = cell.char
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style = cell.style
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link = cell.link
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# Handle link transitions
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if link != in_link:
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if in_link is not None:
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# Close previous link: [label`dest]
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line_parts.append(f"`{in_link}]")
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if link is not None:
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# Close any open style before link
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if cur_style != _EMPTY_STYLE:
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line_parts.append(_emit_style_close(cur_style))
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cur_style = _EMPTY_STYLE
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# Open new link
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line_parts.append("[")
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in_link = link
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# Handle style transitions (not inside links — links handle their own style)
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if link is None and style != cur_style:
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# Close previous style
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if cur_style != _EMPTY_STYLE:
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line_parts.append(_emit_style_close(cur_style))
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# Open new style
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if style != _EMPTY_STYLE:
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line_parts.append(_emit_style_open(style))
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cur_style = style
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line_parts.append(ch)
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# Close any trailing link: [label`dest]
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if in_link is not None:
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line_parts.append(f"`{in_link}]")
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in_link = None
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# Close any trailing style
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if cur_style != _EMPTY_STYLE:
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line_parts.append(_emit_style_close(cur_style))
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line = "".join(line_parts).rstrip()
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lines.append(line)
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# Strip trailing blank lines
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while lines and not lines[-1]:
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lines.pop()
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return "\n".join(lines)
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