🎉 (playfair) support super/subscript unicode literals

devTools/fonts/Makefile

@@ -2,7 +2,7 @@ VENV := .env
 PYTHON := $(VENV)/bin/python3
 PIP := $(VENV)/bin/pip3
 SUBSET := $(VENV)/bin/pyftsubset
-PRETTIER := node ../../node_modules/prettier/bin-prettier.js
+PRETTIER := node ../../node_modules/.bin/prettier
 .PHONY: all install report test clean
 
 default: all
@@ -41,7 +41,9 @@ $(PLAYFAIR).tsv:
 $(PLAYFAIR): $(PLAYFAIR).tsv
 	mkdir -p $@
 	@cat $< | while IFS=$$'\t' read -r url filename; do \
-		curl "$$url" -o "$@/$$(basename $$filename)"; \
+		FONT="$@/$$(basename $$filename)"; \
+		curl -# "$$url" -o "$$FONT"; \
+		$(PYTHON) fix-numerals.py "$$FONT"; \
 	done
 PlayfairDisplay-%.woff2: PlayfairDisplay-%.ttf
 	$(SUBSET) $< --unicodes="*" --flavor=woff2 --layout-features+=$(OT_FEATURES) --name-IDs="*" --output-file="$@"

devTools/fonts/fix-numerals.py

@@ -0,0 +1,72 @@
+#!./env/bin/python3
+"""
+This script performs an in-place modification of the specified font file to insert missing
+character-map entries for superscript and subscript numerals. It's intended to be used on the
+PlayfairDisplay TTFs downloaded from google fonts since they lack those mappings. If invoked with
+the filename "-" it will read from stdin and write the modified font to stdout.
+"""
+from subprocess import run
+from os.path import exists, dirname, abspath
+import sys
+import re
+
+TTX = f'{dirname(abspath(__file__))}/.env/bin/ttx'
+
+# unicode codepoint -> glyph name mappings
+scripts = {
+    # subscripts
+    0x2080: "zero.subs",
+    0x2081: "one.subs",
+    0x2082: "two.subs",
+    0x2083: "three.subs",
+    0x2084: "four.subs",
+    0x2085: "five.subs",
+    0x2086: "six.subs",
+    0x2087: "seven.subs",
+    0x2088: "eight.subs",
+    0x2089: "nine.subs",
+
+    # superscripts
+    0x2070: "zero.sups",
+    0x00B9: "uni00B9", # one
+    0x00B2: "uni00B2", # two
+    0x00B3: "uni00B3", # three
+    0x2074: "four.sups",
+    0x2075: "five.sups",
+    0x2076: "six.sups",
+    0x2077: "seven.sups",
+    0x2078: "eight.sups",
+    0x2079: "nine.sups",
+}
+
+def update_cmap(path):
+    pipe_input = sys.stdin.buffer.read() if path=="-" else None
+    if not exists(path) and not pipe_input:
+        print("No such file:", path, file=sys.stderr)
+        sys.exit(1)
+
+    # decompile the TTF
+    print(f"Updating character tables in {path}...", end=' ', flush=True, file=sys.stderr)
+    ttx_orig = run([TTX, '-o', '-', path], capture_output=True, input=pipe_input).stdout.decode('utf-8')
+
+    # bail out if this font has already been modified
+    for m in re.findall(r'<cmap_format_\d.*?</cmap_format_\d>', ttx_orig, re.DOTALL):
+        if 'zero.subs' in m:
+            print("(already contains super/subscript definitions)", file=sys.stderr)
+            sys.exit(0)
+
+    # add missing definitions to all cmap tables in the font
+    cmap_additions = "".join([
+        f'<map code="{uni:#x}" name="{name}"/>' for uni, name in scripts.items()
+    ])
+    ttx_modified = re.sub(r'(</cmap_format_\d>)', cmap_additions + r'\1', ttx_orig).encode('utf-8')
+
+    # compile the updated font and overwrite the existing file
+    run([TTX, '-q', '-o', path, '-'], input=ttx_modified)
+    print("(done)", file=sys.stderr)
+
+if __name__ == "__main__":
+    try:
+        update_cmap(*sys.argv[1:2])
+    except TypeError:
+        print("Usage: fix-numerals.py <path-to-font>")

devTools/fonts/test.js

@@ -31,6 +31,8 @@ const FAMILIES = {
 }
 
 const SAMPLE_TEXT =
+    // `x<sup>0</sup>x<sup>1</sup>x<sup>2</sup>x<sup>3</sup>x<sup>4</sup>x<sup>5</sup>x<sup>6</sup>x<sup>7</sup>x<sup>8</sup>x<sup>9</sup>x<sub>0</sub>x<sub>1</sub>x<sub>2</sub>x<sub>3</sub>x<sub>4</sub>x<sub>5</sub>x<sub>6</sub>x<sub>7</sub>x<sub>8</sub>x<sub>9</sub>`
+    // `x⁰x¹x²x³x⁴x⁵x⁶x⁷x⁸x⁹x₀x₁x₂x₃x₄x₅x₆x₇x₈x₉`
     "hamburgefonstiv 0123<sub>456</sub><sup>789</sup> ←↑→↓↔↕↖↗↘↙"
 
 function pangram(family, postscriptNames = false) {