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docs: new design for the documentation site (#5934)
* docs: new design for the documentation site Apply the brand to the Material for MkDocs site: Inter and JetBrains Mono served by the site (upright and real italic), brand colours, blue header band with the syntax pattern, wordmark in the header, new home page (hero, cards, animated feature tour), 404 page, polish for tabs, search, footer, focus rings, tables and code blocks, and theme features (code copy, previous/next footer, TOC follow, search suggestions). Draw the number railroad diagram, the parser callback events and the iterator illustrations as inline SVGs that follow the light and dark scheme. The generator scripts are in docs/mkdocs/scripts/figures; the feature slideshow (json-light.svg, json-dark.svg, replacing json.gif on the home page) is built by docs/mkdocs/scripts/slideshow. Decision nodes in five flowcharts become hexagons, which need far less room. Signed-off-by: Niels Lohmann <mail@nlohmann.me> * docs: add figures, table captions and a macro chooser - Figures with numbered captions: SAX stepper, json_view layout and edit stepper, exception map, JSON pointer and patch walkers, QA pipeline, scaling and binary size charts, roadmap lanes, release timeline, integration decision tree and namespace builder - Table captions (nj-table-caption) on 9 pages - Compile times: modules and PCH charts, filesystem section, re-measured Figure 1, links between features/modules.md and compile_times.md - Interactive macro chooser for features/arbitrary_types.md - Link check: exclude URLs that answer the plugin with 400/401/419 or are dead (customers.md) Signed-off-by: Niels Lohmann <mail@nlohmann.me> * docs: macro chooser generates adl_serializer for non-default-constructible types Signed-off-by: Niels Lohmann <mail@nlohmann.me> * docs: cross-link concept pages and API pages in See also sections Add See also links in both directions between the concept pages (features, home, integration) and the API pages, write API links in code font, give every entry a comment after a dash, and show the callback event figure on the parser callbacks page. Signed-off-by: Niels Lohmann <mail@nlohmann.me> * docs: address review comments on the new design - Home: add a "Latest release" button - Sponsors: update the list and group it by tier - Features: list all feature pages on the index page - Releases: add highlights per release, link the 4.0 roadmap, add the first commit to the timeline - Exceptions: prefix all example messages with the exception name - API: no code font for format names in the See also links of the to_/from_ pages - Merge Patch: show the document before, the patch, and the result - Replace "--" with typographic dashes, mark external links with an icon, center Mermaid diagrams Signed-off-by: Niels Lohmann <mail@nlohmann.me> --------- Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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"""Draws the measurement charts as inline SVGs into docs/images/.
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Generated files:
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- compile_times.svg: percent change in compile time per option at -O0 (integration/compile_times.md)
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- compile_times_pch.svg, compile_times_modules.svg: percent change per translation unit with a precompiled header or
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`import nlohmann.json;` at -O0, plus the one-off build cost (integration/compile_times.md)
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- binary_sizes_<file>.svg: encoded size per binary format relative to minified JSON, one panel per test file
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(features/binary_formats/index.md, reused on features/performance.md)
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- ordered_json_scaling.svg: parse time of a flat object for json vs. ordered_json (features/performance.md)
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Every number below is copied from the tables on those pages (or, where noted, computed from the milliseconds they
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report); the tables stay on the pages as the accessible fallback. Update both together. The SVGs are not images:
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the pages include their text with `--8<-- "images/<name>.svg"`, so they pick up the colours and fonts of the page
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(see the `nj-charts` rules in docs/css/fig-charts.css). Run `python3 scripts/figures/charts.py` from docs/mkdocs after
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changing data or drawing, and commit the generated files. In SVG text write the word JSON as `J​SON`,
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otherwise the abbreviation extension wraps it in an <abbr> and the text disappears.
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"""
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import html
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import math
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import re
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from pathlib import Path
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OUT = Path(__file__).resolve().parents[2] / "docs" / "images"
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MINUS = "−"
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JSON = "J​SON"
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# words the abbreviation extension (includes/glossary.md) would wrap in <abbr> inside the SVG text
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ABBR = re.compile(r"(?<![\w;])(BJData|BON8|BSON|CBOR|GCC|UBJSON|MsgPack|JSON|DOM|SAX)(?!\w)")
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def protect(text):
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return ABBR.sub(lambda m: m.group(1)[0] + "​" + m.group(1)[1:], text)
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def esc(s):
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return html.escape(s, quote=True).replace("J&#8203;SON", JSON).replace("&#8722;", MINUS)
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def write(name, W, H, cls, tid, title, desc, body):
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s = ['<svg class="nj-fig nj-charts %s" viewBox="0 0 %g %g" role="img" aria-labelledby="%s %s-d" '
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'xmlns="http://www.w3.org/2000/svg">' % (cls, W, H, tid, tid),
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'<title id="%s">%s</title>' % (tid, esc(title)),
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'<desc id="%s-d">%s</desc>' % (tid, esc(desc))]
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s += body
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s.append('</svg>')
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(OUT / name).write_text(protect("\n".join(s)) + "\n")
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def hbar(x0, x1, y, h, r=4):
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"""Horizontal bar from the baseline x0 to x1, rounded only at the data end."""
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if abs(x1 - x0) < 0.5:
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return "M%g %g h0.5 v%g h-0.5 Z" % (x0, y, h)
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r = min(r, h / 2, abs(x1 - x0))
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s = 1 if x1 > x0 else -1
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return ("M%g %g H%g Q%g %g %g %g V%g Q%g %g %g %g H%g Z"
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% (x0, y, x1 - s * r, x1, y, x1, y + r, y + h - r, x1, y + h, x1 - s * r, y + h, x0))
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def pct(v):
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if v == 0:
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return "0 %"
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return ("+" if v > 0 else MINUS) + "%g %%" % abs(v)
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# ---------- compile times (integration/compile_times.md, -O0 columns) ----------
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# (label, translation unit, Apple clang %, GCC 16 %, computed?), ordered by saving
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COMPILE = [
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("json_fwd.hpp instead of json.hpp", "header-only TU", -62, -82, False),
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("extern template", "parsing TU", -7, -21, False),
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("JSON_NO_AUTOMATIC_UDLS", "model TU", -11, -11, False),
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("JSON_NO_AUTOMATIC_UDLS", "parsing TU", -1, -2, False),
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("JSON_HAS_FILESYSTEM=0 + JSON_NO_IO", "model TU", -8, -11, False),
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("JSON_HAS_FILESYSTEM=0", "model TU", -5, -9, False),
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# computed from the ms in "Options without effect on compile times": 1034/1051, 1756/1801, 1055/1051, 1783/1801
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("JSON_NO_IO", "model TU", round((1034 / 1051 - 1) * 100), round((1756 / 1801 - 1) * 100), True),
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("JSON_USE_GLOBAL_UDLS=0", "model TU", round((1055 / 1051 - 1) * 100), round((1783 / 1801 - 1) * 100), True),
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]
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def compile_times():
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W, L, R = 470, 8, 402
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lo, hi = -90, 10
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X = lambda v: L + (v - lo) / (hi - lo) * (R - L)
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top, pitch, bh = 64, 52, 12
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H = top + pitch * len(COMPILE) + 30
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b = []
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# legend
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b.append('<rect class="nj-charts-clang" x="%g" y="10" width="12" height="12" rx="3"/>' % L)
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b.append('<text class="nj-charts-leg" x="%g" y="20.5">Apple clang</text>' % (L + 18))
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b.append('<rect class="nj-charts-gcc" x="%g" y="10" width="12" height="12" rx="3"/>' % (L + 118))
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b.append('<text class="nj-charts-leg" x="%g" y="20.5">GCC 16</text>' % (L + 136))
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# grid and ticks
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axis_y = top + pitch * len(COMPILE) - 8
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for t in (-80, -60, -40, -20):
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b.append('<line class="nj-charts-grid" x1="%g" y1="%g" x2="%g" y2="%g"/>' % (X(t), top - 6, X(t), axis_y))
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b.append('<text class="nj-charts-tick" x="%g" y="%g">%s</text>' % (X(t), axis_y + 16, pct(t)))
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b.append('<text class="nj-charts-tick" x="%g" y="%g">0 %%</text>' % (X(0), axis_y + 16))
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b.append('<text class="nj-charts-tick nj-charts-tick--l" x="%g" y="%g">← faster</text>' % (L, axis_y + 34))
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b.append('<text class="nj-charts-tick nj-charts-tick--r" x="%g" y="%g">slower →</text>' % (W - 8, axis_y + 34))
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for i, (label, tu, clang, gcc, computed) in enumerate(COMPILE):
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y = top + i * pitch
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b.append('<text class="nj-charts-rowlabel" x="%g" y="%g"><tspan class="nj-charts-code">%s</tspan>'
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'<tspan class="nj-charts-sub"> · %s%s</tspan></text>'
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% (L, y - 2, esc(label), tu, "*" if computed else ""))
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for j, (v, cls, name) in enumerate(((clang, "clang", "Apple clang"), (gcc, "gcc", "GCC 16"))):
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by = y + 6 + j * (bh + 2)
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b.append('<path class="nj-charts-%s" d="%s"><title>%s, %s (%s): %s</title></path>'
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% (cls, hbar(X(0), X(v), by, bh), esc(label), tu, name, esc(pct(v))))
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b.append('<text class="nj-charts-val" x="%g" y="%g">%s</text>' % (max(X(0), X(v)) + 5, by + bh - 1.5, pct(v)))
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b.append('<line class="nj-charts-zero" x1="%g" y1="%g" x2="%g" y2="%g"/>' % (X(0), top - 6, X(0), axis_y))
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H = axis_y + 44
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desc = "; ".join("%s on a %s: Apple clang %s, GCC 16 %s" % (label, tu.replace("TU", "translation unit"),
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pct(c).replace(MINUS, "-"), pct(g).replace(MINUS, "-")) for label, tu, c, g, _ in COMPILE)
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write("compile_times.svg", W, H, "nj-charts--compile", "nj-charts-ct",
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"Change in compile time against the default configuration at -O0, Apple clang and GCC 16",
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"Grouped horizontal bars, negative is faster. " + desc + ".", b)
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# ---------- precompiled headers and C++20 modules (integration/compile_times.md, -O0 columns) ----------
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# Per-TU medians of the wall-clock time in ms from the tables "Use precompiled headers" (-std=c++17) and
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# "Use C++20 modules" (-std=c++20): {translation unit: {compiler: (default ms, with PCH/module ms)}}, plus the one-off
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# build cost in ms per compiler. None instead of a value means "not measured"; NOT_AVAILABLE then gives the reason.
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PCH = {
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"model TU": {"Apple clang": (1045, 594), "GCC 16": (1789, 1060)},
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"parsing TU": {"Apple clang": (1148, 714), "GCC 16": (2498, 1884)},
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}
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PCH_BUILD = {"Apple clang": 771, "GCC 16": 2254}
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MODULES = {
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"model TU": {"Apple clang": (1311, 680), "GCC 16": (2156, 1153)},
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"parsing TU": {"Apple clang": (1387, 800), "GCC 16": (2838, 1810)},
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}
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MODULES_BUILD = {"Apple clang": 1630, "GCC 16": 2538}
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NOT_AVAILABLE = {} # compiler: reason
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def tradeoff(name, tid, rows, build, what, title, desc_intro):
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"""Percent change per TU (bars) and the one-off build cost (text rows below) for two compilers."""
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W, L, R = 440, 8, 372
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lo, hi = -60, 0
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X = lambda v: L + (v - lo) / (hi - lo) * (R - L)
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top, pitch, bh = 64, 52, 12
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comps = (("Apple clang", "clang"), ("GCC 16", "gcc"))
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b, desc = [], []
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b.append('<rect class="nj-charts-clang" x="%g" y="10" width="12" height="12" rx="3"/>' % L)
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b.append('<text class="nj-charts-leg" x="%g" y="20.5">Apple clang</text>' % (L + 18))
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b.append('<rect class="nj-charts-gcc" x="%g" y="10" width="12" height="12" rx="3"/>' % (L + 118))
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b.append('<text class="nj-charts-leg" x="%g" y="20.5">GCC 16</text>' % (L + 136))
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axis_y = top + pitch * len(rows) - 8
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for t in (-50, -25):
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b.append('<line class="nj-charts-grid" x1="%g" y1="%g" x2="%g" y2="%g"/>' % (X(t), top - 6, X(t), axis_y))
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b.append('<text class="nj-charts-tick" x="%g" y="%g">%s</text>' % (X(t), axis_y + 16, pct(t)))
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b.append('<text class="nj-charts-tick" x="%g" y="%g">0 %%</text>' % (X(0), axis_y + 16))
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b.append('<text class="nj-charts-tick nj-charts-tick--l" x="%g" y="%g">← faster per TU</text>' % (L, axis_y + 34))
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for i, (tu, vals) in enumerate(rows.items()):
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y = top + i * pitch
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b.append('<text class="nj-charts-rowlabel" x="%g" y="%g">%s<tspan class="nj-charts-sub"> · %s</tspan></text>'
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% (L, y - 2, tu, esc(what)))
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for j, (comp, cls) in enumerate(comps):
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by = y + 6 + j * (bh + 2)
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pair = vals[comp]
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if pair is None:
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b.append('<text class="nj-charts-note" x="%g" y="%g">%s: not available: %s</text>'
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% (L, by + bh - 1.5, comp, esc(NOT_AVAILABLE.get(comp, "not measured"))))
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desc.append("%s, %s: not available" % (tu, comp))
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continue
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d, w = pair
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v = round((w / d - 1) * 100)
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b.append('<path class="nj-charts-%s" d="%s"><title>%s, %s: %d ms by default, %d ms %s (%s)</title></path>'
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% (cls, hbar(X(0), X(v), by, bh), tu, comp, d, w, esc(what), esc(pct(v))))
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b.append('<text class="nj-charts-val" x="%g" y="%g">%s</text>' % (X(0) + 5, by + bh - 1.5, pct(v)))
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desc.append("%s, %s: %s (%d ms to %d ms)" % (tu, comp, pct(v).replace(MINUS, "-"), d, w))
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b.append('<line class="nj-charts-zero" x1="%g" y1="%g" x2="%g" y2="%g"/>' % (X(0), top - 6, X(0), axis_y))
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# one-off cost
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y = axis_y + 62
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b.append('<text class="nj-charts-rowlabel" x="%g" y="%g">One-off cost<tspan class="nj-charts-sub"> · built once, '
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'reused by every TU</tspan></text>' % (L, y))
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for j, (comp, cls) in enumerate(comps):
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yy = y + 20 + j * 20
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b.append('<rect class="nj-charts-%s" x="%g" y="%g" width="10" height="10" rx="2.5"/>' % (cls, L, yy - 9.5))
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ms = build[comp]
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saved = sorted(vals[comp][0] - vals[comp][1] for vals in rows.values() if vals[comp] is not None)
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txt = ("%s: %d ms once, saves %d to %d ms per TU" % (comp, ms, saved[0], saved[-1])) if ms is not None else ("%s: not available: %s" % (comp, NOT_AVAILABLE.get(comp, "not measured")))
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b.append('<text class="nj-charts-val" x="%g" y="%g">%s</text>' % (L + 16, yy, esc(txt)))
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desc.append("one-off build, %s: %s" % (comp, ("%d ms" % ms) if ms is not None else "not available"))
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H = y + 20 + 20 * len(comps)
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write(name, W, H, "nj-charts--compile", tid, title, desc_intro + " " + "; ".join(desc) + ".", b)
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# ---------- binary sizes (features/binary_formats/index.md, "Sizes") ----------
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FORMATS = ["BJData", "BON8", "BSON", "CBOR", "MessagePack", "UBJSON"] # colour slots 1-6, same in every panel
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SIZES = {
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"canada.json": [53.2, 50.5, 85.8, 50.5, 50.5, 53.2],
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"twitter.json": [91.1, 83.8, 95.2, 86.3, 86.0, 91.3],
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"citm_catalog.json": [78.1, 63.5, 95.8, 68.4, 68.5, 78.2],
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"jeopardy.json": [96.6, 87.5, 106.7, 88.0, 87.9, 96.6],
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}
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def binary_sizes():
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W, L, R = 340, 104, 286
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X = lambda v: L + v / 110 * (R - L)
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top, pitch, bh = 46, 26, 16
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for fname, vals in SIZES.items():
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b, vl = [], [] # value labels go on top of the 100 % line
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lo = min(vals)
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b.append('<text class="nj-charts-panel" x="8" y="18">%s</text>' % fname)
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bottom = top + pitch * len(FORMATS) - 6
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for t in (0, 50):
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b.append('<line class="nj-charts-grid" x1="%g" y1="%g" x2="%g" y2="%g"/>' % (X(t), top - 6, X(t), bottom))
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b.append('<text class="nj-charts-tick" x="%g" y="%g">%d %%</text>' % (X(t), bottom + 15, t))
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for i, (fmt, v) in enumerate(zip(FORMATS, vals)):
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y = top + i * pitch
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best = v == lo
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b.append('<text class="nj-charts-rowlabel nj-charts-fmt%s" x="%g" y="%g">%s</text>'
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% (" nj-charts-best" if best else "", L - 8, y + bh - 3.5, fmt))
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b.append('<path class="nj-charts-c%d%s" d="%s"><title>%s, %s: %g %% of minified %s%s</title></path>'
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% (i + 1, "" if best else " nj-charts-dim", hbar(X(0), X(v), y, bh), fname, fmt, v, JSON,
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" (smallest)" if best else ""))
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vl.append('<text class="nj-charts-val%s" x="%g" y="%g">%.1f %%</text>'
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% (" nj-charts-best" if best else "", X(v) + 5, y + bh - 3.5, v))
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b.append('<line class="nj-charts-ref" x1="%g" y1="%g" x2="%g" y2="%g"/>' % (X(100), top - 10, X(100), bottom))
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b.append('<text class="nj-charts-tick nj-charts-tick--r" x="%g" y="%g">minified %s = 100 %%</text>'
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% (X(100) + 2, top - 14, JSON))
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b.append('<text class="nj-charts-tick" x="%g" y="%g">100 %%</text>' % (X(100), bottom + 15))
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b += vl
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H = bottom + 24
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best = [f for f, v in zip(FORMATS, vals) if v == lo]
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desc = "; ".join("%s %g %%" % (f, v) for f, v in zip(FORMATS, vals))
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stem = fname.split(".")[0]
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write("binary_sizes_%s.svg" % stem, W, H, "nj-charts--sizes", "nj-charts-bs-" + stem,
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"Size of %s in each binary format relative to minified %s" % (fname, JSON),
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"%s. Smallest: %s." % (desc, " and ".join(best)), b)
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# ---------- json vs. ordered_json (api/ordered_map.md, cited on features/performance.md) ----------
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SCALING = [(2000, 0.7, 3.6, 5), (4000, 0.8, 14.0, 19), (8000, 1.6, 67.8, 43), (16000, 3.3, 181.6, 54)]
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def scaling():
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W, L, R, T, B = 440, 66, 330, 16, 210
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xs = [n for n, *_ in SCALING]
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X = lambda n: L + math.log2(n / xs[0]) / math.log2(xs[-1] / xs[0]) * (R - L)
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Y = lambda ms: B - (math.log10(ms) - math.log10(0.3)) / (math.log10(300) - math.log10(0.3)) * (B - T)
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b = []
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for t in (1, 10, 100):
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b.append('<line class="nj-charts-grid" x1="%g" y1="%g" x2="%g" y2="%g"/>' % (L, Y(t), R, Y(t)))
|
||||
b.append('<text class="nj-charts-tick nj-charts-tick--r" x="%g" y="%g">%g ms</text>' % (L - 6, Y(t) + 4, t))
|
||||
b.append('<line class="nj-charts-axis" x1="%g" y1="%g" x2="%g" y2="%g"/>' % (L, B, R, B))
|
||||
for n, a, o, f in SCALING:
|
||||
b.append('<text class="nj-charts-tick" x="%g" y="%g">%s</text>' % (X(n), B + 16, "{:,}".format(n).replace(",", " ")))
|
||||
for key, idx, cls, name in (("json", 1, "json", "json"), ("ojson", 2, "ojson", "ordered_json")):
|
||||
pts = [(X(r[0]), Y(r[idx])) for r in SCALING]
|
||||
b.append('<polyline class="nj-charts-%s" points="%s"/>' % (cls, " ".join("%g,%g" % p for p in pts)))
|
||||
for (x, y), r in zip(pts, SCALING):
|
||||
b.append('<circle class="nj-charts-%s-dot" cx="%g" cy="%g" r="4.5"><title>%s, %d keys: %g ms</title></circle>'
|
||||
% (cls, x, y, name, r[0], r[idx]))
|
||||
last = SCALING[-1]
|
||||
b.append('<text class="nj-charts-val nj-charts-name-%s" x="%g" y="%g">%s</text>' % (cls, pts[-1][0] + 10, pts[-1][1] - 2, name))
|
||||
b.append('<text class="nj-charts-val" x="%g" y="%g">%g ms</text>' % (pts[-1][0] + 10, pts[-1][1] + 13, last[idx]))
|
||||
first = SCALING[0]
|
||||
dy = 16 if key == "json" else 20
|
||||
b.append('<text class="nj-charts-val" x="%g" y="%g">%g ms</text>' % (pts[0][0] + 6, pts[0][1] + dy, first[idx]))
|
||||
write("ordered_json_scaling.svg", W, B + 28, "nj-charts--scaling", "nj-charts-sc",
|
||||
"Time to parse a flat object of n keys, json against ordered_json, logarithmic axes",
|
||||
"2000 keys: json 0.7 ms, ordered_json 3.6 ms (5x). 4000 keys: 0.8 ms and 14.0 ms (19x). "
|
||||
"8000 keys: 1.6 ms and 67.8 ms (43x). 16000 keys: 3.3 ms and 181.6 ms (54x).", b)
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
compile_times()
|
||||
tradeoff("compile_times_pch.svg", "nj-charts-pch", PCH, PCH_BUILD, "with PCH",
|
||||
"Compile time per translation unit with a precompiled json.hpp at -O0, and the one-off cost of the PCH",
|
||||
"Horizontal bars, negative is faster, medians of nine runs, -std=c++17.")
|
||||
tradeoff("compile_times_modules.svg", "nj-charts-mod", MODULES, MODULES_BUILD, "import nlohmann.json",
|
||||
"Compile time per translation unit with import nlohmann.json at -O0, and the one-off cost of the module",
|
||||
"Horizontal bars, negative is faster, medians of nine runs, -std=c++20 for both.")
|
||||
binary_sizes()
|
||||
scaling()
|
||||
Reference in new issue
Block a user