"""
render_body.py — Build the inner-page PDF from tokens.json + content.json.
Usage:
python3 render_body.py --tokens tokens.json --content content.json --out body.pdf
Block types:
h1 h2 h3 Headings (h1 adds a full-width accent rule below)
body Justified prose paragraph
bullet Bullet list item (• prefix)
numbered Auto-numbered list item (resets when interrupted)
callout Highlighted insight box with left accent bar
table Data table with accent header + alternating rows
image Inline image from file path
figure Image with auto-numbered "Figure N:" caption
code Monospace code block with accent left border
math Display math formula via matplotlib mathtext
chart Bar / line / pie chart rendered via matplotlib
flowchart Process diagram rendered via matplotlib
bibliography Numbered reference list
divider Full-width accent rule
caption Small muted text (e.g., under a figure)
pagebreak Force a new page
spacer Vertical whitespace (pt field, default 12)
Exit codes: 0 success, 1 bad args/missing file, 2 missing dep, 3 render error
"""
import argparse
import io
import json
import os
import sys
import importlib.util
def ensure_deps():
missing = [p for p in ("reportlab", "pypdf")
if importlib.util.find_spec(p) is None]
if missing:
import subprocess
subprocess.check_call(
[sys.executable, "-m", "pip", "install",
"--break-system-packages", "-q"] + missing
)
ensure_deps()
from reportlab.platypus import (
BaseDocTemplate, PageTemplate, Frame,
Paragraph, Spacer, Table, TableStyle,
HRFlowable, PageBreak, Flowable, KeepTogether,
Preformatted, Image as RLImage,
)
from reportlab.lib.pagesizes import A4
from reportlab.lib.styles import ParagraphStyle
from reportlab.lib.colors import HexColor
from reportlab.lib.enums import TA_JUSTIFY, TA_CENTER
from reportlab.pdfbase import pdfmetrics
from reportlab.pdfbase.ttfonts import TTFont
def register_fonts(tokens: dict):
"""Register TTF fonts from token font_paths if present."""
for name, fpath in tokens.get("font_paths", {}).items():
if os.path.exists(fpath):
try:
pdfmetrics.registerFont(TTFont(name, fpath))
except Exception:
pass
class CalloutBox(Flowable):
"""Highlighted insight box: coloured background + 4px left accent bar."""
def __init__(self, text: str, style, accent: str, bg: str):
super().__init__()
self._para = Paragraph(text, style)
self._accent = HexColor(accent)
self._bg = HexColor(bg)
def wrap(self, aw, ah):
self._w = aw
_, ph = self._para.wrap(aw - 36, ah)
self._h = ph + 22
return aw, self._h
def draw(self):
c = self.canv
c.setFillColor(self._bg)
c.roundRect(0, 0, self._w, self._h, 5, fill=1, stroke=0)
c.setFillColor(self._accent)
c.rect(0, 0, 4, self._h, fill=1, stroke=0)
self._para.drawOn(c, 18, 11)
class BibliographyItem(Flowable):
"""Single hanging-indent bibliography entry rendered as [N] text."""
LABEL_W = 28
def __init__(self, ref_id: str, text: str, style, dark: str):
super().__init__()
self._id = ref_id
self._text = text
self._style = style
self._dark = HexColor(dark)
def wrap(self, aw, ah):
self._w = aw
self._para = Paragraph(self._text, self._style)
_, ph = self._para.wrap(aw - self.LABEL_W, ah)
self._h = ph + 4
return aw, self._h
def draw(self):
c = self.canv
c.setFillColor(self._dark)
c.setFont("Helvetica-Bold", 8.5)
c.drawString(0, self._h - 12, f"[{self._id}]")
self._para.drawOn(c, self.LABEL_W, 2)
class BeautifulDoc(BaseDocTemplate):
def __init__(self, path: str, tokens: dict, **kw):
self._t = tokens
super().__init__(path, **kw)
fr = Frame(
self.leftMargin, self.bottomMargin,
self.width, self.height, id="body",
)
tmpl = PageTemplate(id="main", frames=fr, onPage=self._decorate)
self.addPageTemplates([tmpl])
def _decorate(self, canv, doc):
t = self._t
lm = doc.leftMargin
rm = doc.rightMargin
pw = doc.pagesize[0]
ph = doc.pagesize[1]
top = ph - doc.topMargin
canv.saveState()
canv.setStrokeColor(HexColor(t["accent"]))
canv.setLineWidth(1.5)
canv.line(lm, top + 12, pw - rm, top + 12)
canv.setFillColor(HexColor(t["muted"]))
canv.setFont(t["font_body_rl"], t["size_meta"])
canv.drawString(lm, top + 16, t["title"].upper())
canv.drawRightString(pw - rm, top + 16, t.get("date", ""))
canv.setStrokeColor(HexColor("#DDDDDD"))
canv.setLineWidth(0.5)
canv.line(lm, doc.bottomMargin - 12, pw - rm, doc.bottomMargin - 12)
canv.setFillColor(HexColor(t["muted"]))
canv.setFont(t["font_body_rl"], t["size_meta"])
canv.drawString(lm, doc.bottomMargin - 22, t.get("author", ""))
canv.drawRightString(pw - rm, doc.bottomMargin - 22, str(doc.page))
canv.restoreState()
def make_styles(t: dict) -> dict:
hf = t["font_display_rl"]
bf = t["font_body_rl"]
bfb = t["font_body_b_rl"]
dk = t["body_text"]
d = t["dark"]
mu = t["muted"]
return {
"h1": ParagraphStyle("H1",
fontName=hf, fontSize=t["size_h1"],
leading=t["size_h1"] * 1.3,
textColor=HexColor(d),
spaceBefore=t["section_gap"], spaceAfter=4,
),
"h2": ParagraphStyle("H2",
fontName=hf, fontSize=t["size_h2"],
leading=t["size_h2"] * 1.4,
textColor=HexColor(d),
spaceBefore=18, spaceAfter=5,
),
"h3": ParagraphStyle("H3",
fontName=bfb, fontSize=t["size_h3"],
leading=t["size_h3"] * 1.5,
textColor=HexColor(d),
spaceBefore=12, spaceAfter=3,
),
"body": ParagraphStyle("Body",
fontName=bf, fontSize=t["size_body"],
leading=t["line_gap"],
textColor=HexColor(dk),
spaceAfter=t["para_gap"], alignment=TA_JUSTIFY,
),
"bullet": ParagraphStyle("Bullet",
fontName=bf, fontSize=t["size_body"],
leading=t["line_gap"] - 1,
textColor=HexColor(dk),
spaceAfter=4, leftIndent=14,
),
"numbered": ParagraphStyle("Numbered",
fontName=bf, fontSize=t["size_body"],
leading=t["line_gap"] - 1,
textColor=HexColor(dk),
spaceAfter=4, leftIndent=22, firstLineIndent=-22,
),
"callout": ParagraphStyle("Callout",
fontName=bfb, fontSize=t["size_body"] + 0.5, leading=16,
textColor=HexColor(d),
),
"caption": ParagraphStyle("Caption",
fontName=bf, fontSize=t["size_caption"], leading=13,
textColor=HexColor(mu), spaceAfter=6,
alignment=TA_CENTER,
),
"table_header": ParagraphStyle("TblH",
fontName=bfb, fontSize=9.5, leading=13,
textColor=HexColor("#FFFFFF"),
),
"table_cell": ParagraphStyle("TblC",
fontName=bf, fontSize=9.5, leading=13,
textColor=HexColor(dk),
),
"code": ParagraphStyle("Code",
fontName="Courier", fontSize=8.5, leading=12.5,
textColor=HexColor(dk),
),
"code_lang": ParagraphStyle("CodeLang",
fontName="Courier", fontSize=7, leading=10,
textColor=HexColor(mu),
),
"bib": ParagraphStyle("Bib",
fontName=bf, fontSize=9, leading=14,
textColor=HexColor(dk),
),
"bib_title": ParagraphStyle("BibTitle",
fontName=hf, fontSize=t["size_h2"],
leading=t["size_h2"] * 1.4,
textColor=HexColor(d),
spaceBefore=t["section_gap"], spaceAfter=8,
),
"math_fallback": ParagraphStyle("MathFb",
fontName="Courier", fontSize=9, leading=13,
textColor=HexColor(dk),
),
"eq_label": ParagraphStyle("EqLabel",
fontName="Helvetica", fontSize=9, leading=12,
textColor=HexColor(mu),
),
}
def _divider(accent: str) -> HRFlowable:
return HRFlowable(
width="100%", thickness=1.2,
color=HexColor(accent),
spaceBefore=14, spaceAfter=14,
)
def _image_from_bytes(png_bytes: bytes, usable_w: float,
max_frac: float = 0.88) -> RLImage:
"""Create a scaled RLImage from PNG bytes, bounded to max_frac of usable_w."""
img = RLImage(io.BytesIO(png_bytes))
max_w = usable_w * max_frac
if img.drawWidth > max_w:
scale = max_w / img.drawWidth
img.drawWidth = max_w
img.drawHeight = img.drawHeight * scale
return img
def _render_math_png(expr: str, dpi: int = 180) -> bytes | None:
"""
Render a LaTeX math expression via matplotlib mathtext.
No LaTeX binary required — uses matplotlib's built-in math parser.
Supports: fractions (\\frac), integrals (\\int), sums (\\sum),
Greek letters, sub/superscripts, etc.
"""
try:
import matplotlib
matplotlib.use("Agg")
import matplotlib.pyplot as plt
fig = plt.figure(figsize=(8, 1.2))
fig.patch.set_facecolor("white")
ax = fig.add_axes([0, 0, 1, 1])
ax.set_axis_off()
ax.set_facecolor("white")
ax.text(0.5, 0.5, f"${expr}$",
fontsize=16, ha="center", va="center",
transform=ax.transAxes)
buf = io.BytesIO()
fig.savefig(buf, format="png", dpi=dpi, bbox_inches="tight",
facecolor="white", pad_inches=0.1)
plt.close(fig)
buf.seek(0)
return buf.read()
except Exception:
return None
def _render_chart_png(item: dict, accent: str, dpi: int = 150) -> bytes | None:
"""
Render bar / line / pie chart to PNG using matplotlib.
Required fields:
chart_type "bar" | "line" | "pie" (default "bar")
labels list of category strings
datasets list of {label?, values: list[number]}
Optional fields:
title chart title
x_label X-axis label
y_label Y-axis label
"""
try:
import matplotlib
matplotlib.use("Agg")
import matplotlib.pyplot as plt
import matplotlib.colors as mcolors
import colorsys
import numpy as np
chart_type = item.get("chart_type", "bar")
title_text = item.get("title", "")
labels = item.get("labels", [])
datasets = item.get("datasets", [])
r, g, b = mcolors.to_rgb(accent)
h, s, v = colorsys.rgb_to_hsv(r, g, b)
palette = [
colorsys.hsv_to_rgb(
(h + i * 0.13) % 1.0,
max(0.35, s - i * 0.08),
min(0.92, v + i * 0.04),
)
for i in range(max(len(datasets), 1))
]
fig, ax = plt.subplots(figsize=(7, 3.6), dpi=dpi)
fig.patch.set_facecolor("white")
ax.set_facecolor("white")
if chart_type == "bar":
x = np.arange(len(labels))
n = max(len(datasets), 1)
width = 0.68 / n
for i, ds in enumerate(datasets):
offset = (i - (n - 1) / 2) * width
ax.bar(x + offset, ds.get("values", []), width * 0.88,
label=ds.get("label", f"Series {i+1}"),
color=palette[i % len(palette)], edgecolor="none")
ax.set_xticks(x)
ax.set_xticklabels(labels, fontsize=8.5)
ax.yaxis.grid(True, alpha=0.25, color="#CCCCCC", linewidth=0.7)
ax.set_axisbelow(True)
if item.get("x_label"):
ax.set_xlabel(item["x_label"], fontsize=8.5)
if item.get("y_label"):
ax.set_ylabel(item["y_label"], fontsize=8.5)
elif chart_type == "line":
x = np.arange(len(labels))
for i, ds in enumerate(datasets):
ax.plot(x, ds.get("values", []), marker="o", markersize=3.5,
label=ds.get("label", f"Series {i+1}"),
color=palette[i % len(palette)], linewidth=1.8)
ax.set_xticks(x)
ax.set_xticklabels(labels, fontsize=8.5)
ax.yaxis.grid(True, alpha=0.25, color="#CCCCCC", linewidth=0.7)
ax.set_axisbelow(True)
if item.get("x_label"):
ax.set_xlabel(item["x_label"], fontsize=8.5)
if item.get("y_label"):
ax.set_ylabel(item["y_label"], fontsize=8.5)
elif chart_type == "pie":
vals = datasets[0].get("values", []) if datasets else []
colors = [
colorsys.hsv_to_rgb(
(h + i * 0.11) % 1.0,
max(0.30, s - i * 0.06),
min(0.92, v + i * 0.03),
)
for i in range(len(vals))
]
ax.pie(vals, labels=labels, colors=colors,
autopct="%1.1f%%", pctdistance=0.82,
wedgeprops=dict(edgecolor="white", linewidth=1.4),
textprops=dict(fontsize=8.5))
for spine in ax.spines.values():
spine.set_linewidth(0.5)
spine.set_color("#CCCCCC")
ax.tick_params(axis="both", length=0, labelsize=8.5)
if title_text:
ax.set_title(title_text, fontsize=10, pad=8,
color="#333333", fontweight="bold")
if len(datasets) > 1 and chart_type != "pie":
ax.legend(frameon=False, fontsize=8, loc="upper right")
plt.tight_layout(pad=0.4)
buf = io.BytesIO()
fig.savefig(buf, format="png", dpi=dpi, bbox_inches="tight",
facecolor="white", pad_inches=0.06)
plt.close(fig)
buf.seek(0)
return buf.read()
except Exception:
return None
def _render_flowchart_png(item: dict, accent: str, dark: str,
muted: str, dpi: int = 130) -> bytes | None:
"""
Render a top-to-bottom flowchart using matplotlib patches and arrows.
Node schema: {id, label, shape?}
shape: "rect" (default) | "diamond" | "oval" | "parallelogram"
Edge schema: {from, to, label?}
Forward edges (to a later node) draw straight arrows.
Back edges (to an earlier node) draw a curved arc to the right.
"""
try:
import matplotlib
matplotlib.use("Agg")
import matplotlib.pyplot as plt
import matplotlib.patches as mpatch
from matplotlib.patches import FancyBboxPatch
import matplotlib.colors as mcolors
nodes_list = item.get("nodes", [])
edges = item.get("edges", [])
if not nodes_list:
return None
nodes = {n["id"]: n for n in nodes_list}
order = {n["id"]: i for i, n in enumerate(nodes_list)}
n_nodes = len(nodes_list)
BOX_W = 4.2
BOX_H = 0.58
STEP_Y = 1.25
CX = 5.0
fig_h = max(3.5, n_nodes * STEP_Y + 0.8)
fig, ax = plt.subplots(figsize=(6, fig_h), dpi=dpi)
fig.patch.set_facecolor("white")
ax.set_facecolor("white")
ax.set_xlim(0, 10)
ax.set_ylim(-0.6, n_nodes * STEP_Y + 0.2)
ax.invert_yaxis()
ax.axis("off")
acc_rgb = mcolors.to_rgb(accent)
dark_rgb = mcolors.to_rgb(dark)
muted_rgb = mcolors.to_rgb(muted)
pos = {nid: (CX, i * STEP_Y) for nid, i in order.items()}
for edge in edges:
src, dst = edge.get("from"), edge.get("to")
if src not in pos or dst not in pos:
continue
x1, y1 = pos[src]
x2, y2 = pos[dst]
lbl = edge.get("label", "")
src_shape = nodes.get(src, {}).get("shape", "rect")
dst_shape = nodes.get(dst, {}).get("shape", "rect")
dy_src = BOX_H * (0.80 if src_shape == "diamond" else 0.50)
dy_dst = BOX_H * (0.80 if dst_shape == "diamond" else 0.50)
y_start = y1 + dy_src
y_end = y2 - dy_dst
conn = "arc3,rad=0.0" if y_end > y_start + 0.01 else "arc3,rad=0.42"
ax.annotate("",
xy=(x2, y_end), xytext=(x1, y_start),
arrowprops=dict(
arrowstyle="-|>", color=muted_rgb,
lw=1.0, mutation_scale=10,
connectionstyle=conn,
),
)
if lbl:
mid_x = (x1 + x2) / 2 + 0.28
mid_y = (y_start + y_end) / 2
ax.text(mid_x, mid_y, lbl, fontsize=7.5,
color=muted_rgb, ha="left", va="center")
for nid, (cx, cy) in pos.items():
node = nodes[nid]
shape = node.get("shape", "rect")
label = node.get("label", nid)
left = cx - BOX_W / 2
bot = cy - BOX_H / 2
if shape in ("oval", "terminal"):
el = mpatch.Ellipse(
(cx, cy), BOX_W * 0.78, BOX_H * 1.15,
facecolor=acc_rgb, edgecolor=acc_rgb, linewidth=0,
)
ax.add_patch(el)
ax.text(cx, cy, label, ha="center", va="center",
fontsize=8.5, fontweight="bold", color="white")
elif shape == "diamond":
d = BOX_W * 0.44
diamond = plt.Polygon(
[(cx, cy - d * 0.72), (cx + d, cy),
(cx, cy + d * 0.72), (cx - d, cy)],
facecolor="#FFFCF0",
edgecolor=accent, linewidth=1.2,
)
ax.add_patch(diamond)
ax.text(cx, cy, label, ha="center", va="center",
fontsize=8, color=dark_rgb)
elif shape == "parallelogram":
skew = 0.30
para = plt.Polygon(
[(left + skew, bot), (left + BOX_W + skew, bot),
(left + BOX_W, bot + BOX_H), (left, bot + BOX_H)],
facecolor="white",
edgecolor=accent, linewidth=1.2,
)
ax.add_patch(para)
ax.text(cx, cy, label, ha="center", va="center",
fontsize=8.5, color=dark_rgb)
else:
rect = FancyBboxPatch(
(left, bot), BOX_W, BOX_H,
boxstyle="round,pad=0.04",
facecolor="white",
edgecolor=accent, linewidth=1.2,
)
ax.add_patch(rect)
ax.text(cx, cy, label, ha="center", va="center",
fontsize=8.5, color=dark_rgb)
plt.tight_layout(pad=0.2)
buf = io.BytesIO()
fig.savefig(buf, format="png", dpi=dpi, bbox_inches="tight",
facecolor="white", pad_inches=0.08)
plt.close(fig)
buf.seek(0)
return buf.read()
except Exception:
return None
def _add_heading(story: list, item: dict, ctx: dict, level: int):
key = f"h{level}"
para = Paragraph(item["text"], ctx["styles"][key])
if level == 1:
story.append(KeepTogether([para, _divider(ctx["acc"])]))
else:
story.append(para)
def _add_body(story: list, item: dict, ctx: dict):
story.append(Paragraph(item["text"], ctx["styles"]["body"]))
def _add_bullet(story: list, item: dict, ctx: dict):
story.append(Paragraph(
f"\u2022\u2002{item['text']}", ctx["styles"]["bullet"]
))
def _add_numbered(story: list, item: dict, ctx: dict):
ctx["numbered_n"] += 1
story.append(Paragraph(
f"{ctx['numbered_n']}.\u2002{item['text']}",
ctx["styles"]["numbered"],
))
def _add_callout(story: list, item: dict, ctx: dict):
story.append(Spacer(1, 8))
story.append(CalloutBox(
item["text"], ctx["styles"]["callout"], ctx["acc"], ctx["acc_lt"]
))
story.append(Spacer(1, 8))
def _add_table(story: list, item: dict, ctx: dict):
t = ctx["tokens"]
styles = ctx["styles"]
usable_w = ctx["usable_w"]
acc = ctx["acc"]
acc_lt = ctx["acc_lt"]
headers = [Paragraph(h, styles["table_header"]) for h in item["headers"]]
rows = [
[Paragraph(str(c), styles["table_cell"]) for c in row]
for row in item.get("rows", [])
]
n_cols = len(item["headers"])
if "col_widths" in item and len(item["col_widths"]) == n_cols:
col_w = [usable_w * f for f in item["col_widths"]]
else:
col_w = [usable_w / n_cols] * n_cols
tbl = Table([headers] + rows, colWidths=col_w)
tbl.setStyle(TableStyle([
("BACKGROUND", (0, 0), (-1, 0), HexColor(acc)),
("TEXTCOLOR", (0, 0), (-1, 0), HexColor("#FFFFFF")),
("FONTNAME", (0, 0), (-1, 0), t["font_body_b_rl"]),
("FONTSIZE", (0, 0), (-1, 0), 9.5),
("TOPPADDING", (0, 0), (-1, 0), 7),
("BOTTOMPADDING", (0, 0), (-1, 0), 7),
("ROWBACKGROUNDS", (0, 1), (-1, -1),
[HexColor("#FFFFFF"), HexColor(acc_lt)]),
("FONTNAME", (0, 1), (-1, -1), t["font_body_rl"]),
("FONTSIZE", (0, 1), (-1, -1), 9.5),
("TOPPADDING", (0, 1), (-1, -1), 6),
("BOTTOMPADDING", (0, 1), (-1, -1), 6),
("LEFTPADDING", (0, 0), (-1, -1), 10),
("RIGHTPADDING", (0, 0), (-1, -1), 10),
("BOX", (0, 0), (-1, -1), 0.5, HexColor("#CCCCCC")),
("LINEBELOW", (0, 0), (-1, 0), 1.2, HexColor(acc)),
("TEXTCOLOR", (0, 1), (-1, -1), HexColor(t["body_text"])),
("VALIGN", (0, 0), (-1, -1), "MIDDLE"),
]))
story.append(tbl)
if item.get("caption"):
story.append(Spacer(1, 4))
story.append(Paragraph(item["caption"], styles["caption"]))
story.append(Spacer(1, 12))
def _add_image(story: list, item: dict, ctx: dict):
path = str(item.get("path", item.get("src", "")))
if not os.path.exists(path):
story.append(Paragraph(
f"[Image not found: {path}]", ctx["styles"]["caption"]
))
return
try:
img = RLImage(path)
uw = ctx["usable_w"]
if img.drawWidth > uw:
scale = uw / img.drawWidth
img.drawWidth = uw
img.drawHeight = img.drawHeight * scale
story.append(img)
except Exception as e:
story.append(Paragraph(f"[Image error: {e}]", ctx["styles"]["caption"]))
return
if item.get("caption"):
story.append(Spacer(1, 4))
story.append(Paragraph(item["caption"], ctx["styles"]["caption"]))
story.append(Spacer(1, 8))
def _add_figure(story: list, item: dict, ctx: dict):
"""Like image but auto-numbers the caption as 'Figure N: ...'."""
ctx["figure_n"] += 1
raw_cap = item.get("caption", "")
caption = f"Figure {ctx['figure_n']}: {raw_cap}" if raw_cap \
else f"Figure {ctx['figure_n']}"
_add_image(story, {**item, "caption": caption}, ctx)
def _add_code(story: list, item: dict, ctx: dict):
acc = ctx["acc"]
acc_lt = ctx["acc_lt"]
mu = ctx["mu"]
uw = ctx["usable_w"]
lang = item.get("language", "")
pre = Preformatted(item.get("text", ""), ctx["styles"]["code"])
tbl = Table([[pre]], colWidths=[uw])
tbl.setStyle(TableStyle([
("BACKGROUND", (0, 0), (-1, -1), HexColor(acc_lt)),
("LINEBEFORE", (0, 0), ( 0, -1), 3, HexColor(acc)),
("BOX", (0, 0), (-1, -1), 0.5, HexColor(mu)),
("LEFTPADDING", (0, 0), (-1, -1), 14),
("RIGHTPADDING", (0, 0), (-1, -1), 10),
("TOPPADDING", (0, 0), (-1, -1), 8),
("BOTTOMPADDING", (0, 0), (-1, -1), 8),
]))
story.append(Spacer(1, 6))
if lang:
story.append(Paragraph(lang.upper(), ctx["styles"]["code_lang"]))
story.append(tbl)
story.append(Spacer(1, 6))
def _add_math(story: list, item: dict, ctx: dict):
"""
Display math block.
"""
acc = ctx["acc"]
acc_lt = ctx["acc_lt"]
uw = ctx["usable_w"]
expr = item.get("text", "").strip()
label = item.get("label", "").strip()
png = _render_math_png(expr)
if png is None:
story.append(Spacer(1, 6))
pre = Preformatted(f" {expr}", ctx["styles"]["math_fallback"])
tbl = Table([[pre]], colWidths=[uw])
tbl.setStyle(TableStyle([
("BACKGROUND", (0, 0), (-1, -1), HexColor(acc_lt)),
("LEFTPADDING", (0, 0), (-1, -1), 14),
("RIGHTPADDING", (0, 0), (-1, -1), 14),
("TOPPADDING", (0, 0), (-1, -1), 8),
("BOTTOMPADDING", (0, 0), (-1, -1), 8),
]))
story.append(tbl)
story.append(Spacer(1, 6))
return
img = _image_from_bytes(png, uw, max_frac=0.72)
story.append(Spacer(1, 10))
if label:
label_w = 44
formula_w = uw - label_w
lbl_para = Paragraph(label, ctx["styles"]["eq_label"])
row_tbl = Table([[img, lbl_para]], colWidths=[formula_w, label_w])
row_tbl.setStyle(TableStyle([
("ALIGN", (0, 0), (0, 0), "CENTER"),
("ALIGN", (1, 0), (1, 0), "RIGHT"),
("VALIGN", (0, 0), (-1, -1), "MIDDLE"),
]))
story.append(row_tbl)
else:
row_tbl = Table([[img]], colWidths=[uw])
row_tbl.setStyle(TableStyle([
("ALIGN", (0, 0), (-1, -1), "CENTER"),
]))
story.append(row_tbl)
if item.get("caption"):
story.append(Spacer(1, 4))
story.append(Paragraph(item["caption"], ctx["styles"]["caption"]))
story.append(Spacer(1, 10))
def _add_chart(story: list, item: dict, ctx: dict):
"""
Render a chart (bar / line / pie) via matplotlib.
"""
uw = ctx["usable_w"]
png = _render_chart_png(item, ctx["acc"])
if png is None:
story.append(Paragraph(
"[Chart: install matplotlib to render — pip install matplotlib]",
ctx["styles"]["caption"],
))
return
img = _image_from_bytes(png, uw, max_frac=0.95)
story.append(Spacer(1, 8))
row_tbl = Table([[img]], colWidths=[uw])
row_tbl.setStyle(TableStyle([("ALIGN", (0, 0), (-1, -1), "CENTER")]))
story.append(row_tbl)
raw_cap = item.get("caption", "")
use_fig = item.get("figure", True)
if raw_cap or use_fig:
ctx["figure_n"] += 1
prefix = f"Figure {ctx['figure_n']}: " if use_fig else ""
story.append(Spacer(1, 4))
story.append(Paragraph(prefix + raw_cap, ctx["styles"]["caption"]))
story.append(Spacer(1, 10))
def _add_flowchart(story: list, item: dict, ctx: dict):
"""
Render a flowchart via matplotlib.
"""
uw = ctx["usable_w"]
png = _render_flowchart_png(item, ctx["acc"], ctx["dark"], ctx["mu"])
if png is None:
story.append(Paragraph(
"[Flowchart: install matplotlib to render — pip install matplotlib]",
ctx["styles"]["caption"],
))
return
img = _image_from_bytes(png, uw, max_frac=0.78)
story.append(Spacer(1, 8))
row_tbl = Table([[img]], colWidths=[uw])
row_tbl.setStyle(TableStyle([("ALIGN", (0, 0), (-1, -1), "CENTER")]))
story.append(row_tbl)
raw_cap = item.get("caption", "")
use_fig = item.get("figure", True)
if raw_cap or use_fig:
ctx["figure_n"] += 1
prefix = f"Figure {ctx['figure_n']}: " if use_fig else ""
story.append(Spacer(1, 4))
story.append(Paragraph(prefix + raw_cap, ctx["styles"]["caption"]))
story.append(Spacer(1, 10))
def _add_bibliography(story: list, item: dict, ctx: dict):
"""
Numbered reference list with hanging indent.
"""
heading = item.get("title", "References")
if heading:
story.append(KeepTogether([
Paragraph(heading, ctx["styles"]["bib_title"]),
_divider(ctx["acc"]),
]))
for ref in item.get("items", []):
story.append(Spacer(1, 4))
story.append(BibliographyItem(
str(ref.get("id", "")),
ref.get("text", ""),
ctx["styles"]["bib"],
ctx["dark"],
))
_RESETS_NUMBERED = frozenset({
"h1", "h2", "h3", "body", "bullet", "callout", "table",
"image", "figure", "code", "math", "chart", "flowchart",
"bibliography", "divider", "caption", "pagebreak", "spacer",
})
def build_story(content: list, tokens: dict, styles: dict) -> list:
usable_w = A4[0] - tokens["margin_left"] - tokens["margin_right"]
ctx: dict = {
"tokens": tokens,
"styles": styles,
"usable_w": usable_w,
"acc": tokens["accent"],
"acc_lt": tokens["accent_lt"],
"mu": tokens["muted"],
"dark": tokens["dark"],
"figure_n": 0,
"numbered_n": 0,
}
story: list = []
for item in content:
kind = item.get("type", "body")
if kind in _RESETS_NUMBERED:
ctx["numbered_n"] = 0
if kind == "h1": _add_heading(story, item, ctx, 1)
elif kind == "h2": _add_heading(story, item, ctx, 2)
elif kind == "h3": _add_heading(story, item, ctx, 3)
elif kind == "body": _add_body(story, item, ctx)
elif kind == "bullet": _add_bullet(story, item, ctx)
elif kind == "numbered": _add_numbered(story, item, ctx)
elif kind == "callout": _add_callout(story, item, ctx)
elif kind == "table": _add_table(story, item, ctx)
elif kind == "image": _add_image(story, item, ctx)
elif kind == "figure": _add_figure(story, item, ctx)
elif kind == "code": _add_code(story, item, ctx)
elif kind == "math": _add_math(story, item, ctx)
elif kind == "chart": _add_chart(story, item, ctx)
elif kind == "flowchart": _add_flowchart(story, item, ctx)
elif kind == "bibliography": _add_bibliography(story, item, ctx)
elif kind == "divider": story.append(_divider(ctx["acc"]))
elif kind == "caption":
story.append(Paragraph(item["text"], styles["caption"]))
elif kind == "pagebreak": story.append(PageBreak())
elif kind == "spacer": story.append(Spacer(1, item.get("pt", 12)))
return story
def build(tokens: dict, content: list, out_path: str) -> dict:
register_fonts(tokens)
styles = make_styles(tokens)
doc = BeautifulDoc(
out_path, tokens,
pagesize=A4,
leftMargin=tokens["margin_left"],
rightMargin=tokens["margin_right"],
topMargin=tokens["margin_top"],
bottomMargin=tokens["margin_bottom"],
)
doc.build(build_story(content, tokens, styles))
size = os.path.getsize(out_path)
return {"status": "ok", "out": out_path, "size_kb": size // 1024}
def main():
parser = argparse.ArgumentParser(
description="Render body PDF from tokens.json + content.json"
)
parser.add_argument("--tokens", default="tokens.json")
parser.add_argument("--content", default="content.json")
parser.add_argument("--out", default="body.pdf")
args = parser.parse_args()
for fpath in (args.tokens, args.content):
if not os.path.exists(fpath):
print(
json.dumps({"status": "error",
"error": f"File not found: {fpath}"}),
file=sys.stderr,
)
sys.exit(1)
with open(args.tokens, encoding="utf-8") as f:
tokens = json.load(f)
with open(args.content, encoding="utf-8") as f:
content = json.load(f)
try:
result = build(tokens, content, args.out)
print(json.dumps(result))
except Exception as e:
import traceback
print(
json.dumps({
"status": "error",
"error": str(e),
"trace": traceback.format_exc(),
}),
file=sys.stderr,
)
sys.exit(3)
if __name__ == "__main__":
main()