File size: 7,095 Bytes
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import re
from html import escape
from io import BytesIO
def markdown_to_pdf_bytes(report_markdown: str) -> bytes:
from reportlab.lib import colors
from reportlab.lib.enums import TA_LEFT
from reportlab.lib.pagesizes import A4
from reportlab.lib.styles import ParagraphStyle, getSampleStyleSheet
from reportlab.lib.units import inch
from reportlab.platypus import (
ListFlowable,
ListItem,
Paragraph,
SimpleDocTemplate,
Spacer,
Table,
TableStyle,
)
buffer = BytesIO()
styles = getSampleStyleSheet()
body_style = ParagraphStyle(
"ReportBody",
parent=styles["BodyText"],
fontName="Helvetica",
fontSize=10,
leading=14,
alignment=TA_LEFT,
spaceAfter=5,
)
title_style = ParagraphStyle(
"ReportTitle",
parent=styles["Title"],
fontName="Helvetica-Bold",
fontSize=18,
leading=22,
alignment=TA_LEFT,
spaceAfter=10,
)
heading1_style = ParagraphStyle(
"ReportHeading1",
parent=styles["Heading1"],
fontName="Helvetica-Bold",
fontSize=15,
leading=18,
alignment=TA_LEFT,
spaceBefore=10,
spaceAfter=6,
)
heading2_style = ParagraphStyle(
"ReportHeading2",
parent=styles["Heading2"],
fontName="Helvetica-Bold",
fontSize=12,
leading=15,
alignment=TA_LEFT,
spaceBefore=7,
spaceAfter=4,
)
table_header_style = ParagraphStyle(
"ReportTableHeader",
parent=body_style,
fontName="Helvetica-Bold",
fontSize=8.5,
leading=11,
)
table_cell_style = ParagraphStyle(
"ReportTableCell",
parent=body_style,
fontSize=8.5,
leading=11,
)
doc = SimpleDocTemplate(
buffer,
pagesize=A4,
rightMargin=0.65 * inch,
leftMargin=0.65 * inch,
topMargin=0.65 * inch,
bottomMargin=0.65 * inch,
)
story = []
list_items = []
list_type = "bullet"
table_rows = []
def flush_list() -> None:
nonlocal list_items, list_type
if list_items:
story.append(
ListFlowable(
[ListItem(Paragraph(item, body_style)) for item in list_items],
bulletType=list_type,
bulletFontName="Helvetica",
bulletFontSize=7 if list_type == "bullet" else 9,
leftIndent=16,
bulletIndent=4,
itemSpace=3,
)
)
story.append(Spacer(1, 6))
list_items = []
list_type = "bullet"
def flush_table() -> None:
nonlocal table_rows
if not table_rows:
return
if len(table_rows) >= 2 and _is_markdown_table_separator(table_rows[1]):
rows = [table_rows[0], *table_rows[2:]]
data = []
for row_index, row in enumerate(rows):
style = table_header_style if row_index == 0 else table_cell_style
data.append(
[
Paragraph(_markdown_to_reportlab_text(cell), style)
for cell in _split_table_row(row)
]
)
if data:
col_count = max(len(row) for row in data)
for row in data:
row.extend(
Paragraph("", table_cell_style)
for _ in range(col_count - len(row))
)
table = Table(data, repeatRows=1)
table.setStyle(
TableStyle(
[
("BACKGROUND", (0, 0), (-1, 0), colors.HexColor("#f1f5f9")),
("TEXTCOLOR", (0, 0), (-1, 0), colors.HexColor("#111827")),
("GRID", (0, 0), (-1, -1), 0.35, colors.HexColor("#cbd5e1")),
("VALIGN", (0, 0), (-1, -1), "TOP"),
("LEFTPADDING", (0, 0), (-1, -1), 5),
("RIGHTPADDING", (0, 0), (-1, -1), 5),
("TOPPADDING", (0, 0), (-1, -1), 4),
("BOTTOMPADDING", (0, 0), (-1, -1), 4),
]
)
)
story.append(table)
story.append(Spacer(1, 8))
else:
for row in table_rows:
story.append(Paragraph(_markdown_to_reportlab_text(row), body_style))
table_rows = []
def append_list_item(item: str, item_type: str) -> None:
nonlocal list_items, list_type
if list_items and list_type != item_type:
flush_list()
list_type = item_type
list_items.append(item)
for raw_line in report_markdown.splitlines():
stripped_line = raw_line.strip()
if _is_markdown_table_line(stripped_line):
flush_list()
table_rows.append(stripped_line)
continue
flush_table()
line = _markdown_to_reportlab_text(stripped_line)
if not line:
flush_list()
story.append(Spacer(1, 5))
continue
if line.startswith("- ") or line.startswith("* "):
append_list_item(line[2:].strip(), "bullet")
continue
flush_list()
if line.startswith("# "):
story.append(Paragraph(line[2:].strip(), title_style))
elif line.startswith("## "):
story.append(Paragraph(line[3:].strip(), heading1_style))
elif line.startswith("### "):
story.append(Paragraph(line[4:].strip(), heading2_style))
elif set(line) <= {"-", "_", "*"}:
story.append(Spacer(1, 8))
else:
story.append(Paragraph(line, body_style))
flush_table()
flush_list()
if not story:
raise RuntimeError("No report content available for PDF generation.")
doc.build(story)
return buffer.getvalue()
def _is_markdown_table_line(value: str) -> bool:
return value.startswith("|") and value.endswith("|") and value.count("|") >= 2
def _is_markdown_table_separator(value: str) -> bool:
cells = _split_table_row(value)
return bool(cells) and all(
re.fullmatch(r":?-{3,}:?", cell.strip()) for cell in cells
)
def _split_table_row(value: str) -> list[str]:
return [cell.strip() for cell in value.strip().strip("|").split("|")]
def _markdown_to_reportlab_text(value: str) -> str:
value = escape(value)
value = re.sub(r"^(\d+)\.\s+", r"\1. ", value)
value = re.sub(r"`([^`]+)`", r"\1", value)
value = re.sub(r"\*\*([^*]+)\*\*", r"<b>\1</b>", value)
value = re.sub(r"\*([^*]+)\*", r"<i>\1</i>", value)
return re.sub(
r"\[([^\]]+)\]\(([^)]+)\)",
r'<link href="\2" color="blue">\1</link>',
value,
)
|