createGlyphConstructionFromComposites.py

from mojo.UI import *
"""
RoboFont Script
- Type: Composites
- Purpose: To create RoboFont glyph construction syntax out of the exisiting
composites inside a font using the anchor names.
- Specifications:
    - Determines the base letter and marks according to anchor names.
    - Reconstruct the glyphConstruction syntax from the anchor names.
- Publish Date: 7 Dec 2020
- Author: Bahman Eslami
- License: MIT
"""

resultGlyphContstruction = ""
f = CurrentFont()
OutputWindow().clear()

def getMarkAnchor(g):
	result = []
	for a in g.anchors:
		if a.name[0] == "_":
			result.append(a)
	if len(result) == 1:
		return result[0]
	# print(f"Can't find main anchor in glyph {g.name}")

def getMarkAndBaseGlyph(g):
	baseGlyphs = []
	marks = {}  # {a.name: [g1, g2]}
	for c in g.components:
		baseGlyph = f[c.baseGlyph]
		markAnchor = getMarkAnchor(baseGlyph)
		if markAnchor is not None:
			marks.setdefault(markAnchor.name[1:], []).append(baseGlyph.name)
		else:
			baseGlyphs.append(baseGlyph)
	if marks != {} and len(baseGlyphs) == 1:
		return marks, baseGlyphs[0].name

for g in f.selectedGlyphs:
	if g.contours:
		continue
	if g.components:
		line = f"{g.name} = "
		markAndBaseGlyphs = getMarkAndBaseGlyph(g)
		if markAndBaseGlyphs is not None:
			marks, baseGlyph = markAndBaseGlyphs
			marksSyntax = f"{baseGlyph} + "
			for i, (anchorName, markGlyphs) in enumerate(marks.items()):
				if i == 0:
					for markG in markGlyphs:
						marksSyntax += f"{markG}@{anchorName}"
				else:
					for markG in markGlyphs:
						marksSyntax += f" + {markG}@{baseGlyph}:{anchorName}"
			line += marksSyntax
		else:
			cList = []
			for c in g.components:
				cList.append(c.baseGlyph)
			line += " + ".join(cList)
		if g.unicodes:
			uni = "{:04X}".format(g.unicodes[0])
			line += f" |{uni}"
		line += "\n"
		resultGlyphContstruction += line

print(resultGlyphContstruction)