Iosevka/extract.js

var fs = require('fs');
var TTFWriter = require('node-sfnt').TTFWriter;
var TTF = require('node-sfnt').TTF;
var argv = require('yargs').argv;

var Glyph = require('./support/glyph');

function toBuffer(arrayBuffer) {
	var length = arrayBuffer.byteLength;
	var view = new DataView(arrayBuffer, 0, length);
	var buffer = new Buffer(length);
	for (var i = 0, l = length; i < l; i++) {
		buffer[i] = view.getUint8(i, false);
	}
	return buffer;
}
function pad(s, n){ while(s.length < n) s = '0' + s; return s; }
function mix(a, b, p){ return a + (b - a) * p }

var options = { preserveOS2Version: true };
var font = JSON.parse(fs.readFileSync(argv._[0], 'utf-8'));
if(argv.charmap) {
	fs.writeFileSync(argv.charmap, JSON.stringify(font.glyf.map(function(glyph){
		return [
			glyph.name,
			glyph.unicode,
			glyph.advanceWidth === 0 && glyph.anchors && Object.keys(glyph.anchors).length > 0
		]
	})), 'utf8')
};
if(argv.feature) {
	var featurefile = '\n\n';

	// markGlyphs
	for(var key in font.features.markGlyphs){
		featurefile += '@MG_' + key + '= [' + font.features.markGlyphs[key].join(' ') + '];\n'
	}
	// mark
	var mark = font.features.mark;
	for(var id in mark) {
		var lookup = mark[id];
		var lookupName = 'markAuto_' + id;
		featurefile += 'lookup ' + lookupName + ' {' + lookup.marks.join(';\n') + ';\n'
			+ lookup.bases.join(';\n') + ';} ' + lookupName + ';'
	}
	
	// mkmk
	var mkmk = font.features.mkmk;
	featurefile += 'lookup mkmkAuto {' + mkmk.marks.join(';\n') + ';\n'
		+ mkmk.bases.join(';\n') + ';} mkmkAuto;'
	
	// gdef
	var gdef = font.features.gdef;
	featurefile += '@GDEF_Simple = [' + gdef.simple.join(' \n') + '];\n'
		+ '@GDEF_Ligature =[' + gdef.ligature.join(' \n') + '];\n'
		+ '@GDEF_Mark = [' + gdef.mark.join(' \n') + '];\n'
		+ 'table GDEF { GlyphClassDef @GDEF_Simple, @GDEF_Ligature, @GDEF_Mark, ;} GDEF;'

	fs.writeFileSync(argv.feature, featurefile, 'utf8');
};

/*if(argv.ttf) {
	var upm = (argv.upm - 0) || 1000;
	var upmscale = upm / font.head.unitsPerEm;
	var skew = (argv.uprightify ? 1 : 0) * Math.tan((font.post.italicAngle || 0) / 180 * Math.PI);
	for(var j = 0; j < font.glyf.length; j++){
		var g = font.glyf[j];
		g.advanceWidth *= upmscale;
		if(g.contours) {
			for(var k = 0; k < g.contours.length; k++) {
				var contour = g.contours[k];
				for(var p = 0; p < contour.length; p++) {
					contour[p].y *= upmscale;
					contour[p].x = contour[p].x * upmscale + contour[p].y * skew;
				}
			}
			Glyph.prototype.cleanup.call(g, 1);
		}
	}
	font.head.unitsPerEm        *= upmscale;
	font.hhea.ascent            *= upmscale;
	font['OS/2'].usWinAscent    *= upmscale;
	font['OS/2'].sTypoAscender  *= upmscale;
	font.hhea.descent           *= upmscale;
	font['OS/2'].usWinDescent   *= upmscale;
	font['OS/2'].sTypoDescender *= upmscale;
	font.hhea.lineGap           *= upmscale;
	font['OS/2'].sTypoLineGap   *= upmscale;
	font['OS/2'].sxHeight       *= upmscale;
	font['OS/2'].sCapHeight     *= upmscale;
	
	fs.writeFileSync(argv.ttf, toBuffer(new TTFWriter(options).write(font)));
};*/

if(argv.svg) {
	function cov(x){ return Math.round(x * 10000) / 10000 }
	function toSVGPath(glyph){
		var buf = '';
		if(glyph.contours) for(var j = 0; j < glyph.contours.length; j++) {
			var contour = glyph.contours[j];
			var lx = 0;
			var ly = 0;
			if(contour.length) {
				lx = contour[0].x;
				ly = contour[0].y;
				buf += 'M' + cov(lx) + ' ' + cov(ly);
				for(var k = 1; k < contour.length; k++) if(contour[k].onCurve){
					lx = contour[k].x;
					ly = contour[k].y;
					buf += 'L' + cov(lx) + ' ' + cov(ly);
				} else if(contour[k].cubic) {
					var rx = contour[k + 2].x;
					var ry = contour[k + 2].y;
					buf += 'C' + [contour[k].x, contour[k].y, contour[k + 1].x, contour[k + 1].y, rx, ry].map(cov).join(' ');
					lx = rx;
					ly = ry;
					k += 2;
				} else if(contour[k + 1]) {
					if(contour[k + 1].onCurve){
						var rx = contour[k + 1].x;
						var ry = contour[k + 1].y;
					} else {
						var rx = (contour[k].x + contour[k + 1].x) / 2;
						var ry = (contour[k].y + contour[k + 1].y) / 2;
					}
					var x1 = mix(lx, contour[k].x, 2 / 3);
					var y1 = mix(ly, contour[k].y, 2 / 3);
					var x2 = mix(rx, contour[k].x, 2 / 3);
					var y2 = mix(ry, contour[k].y, 2 / 3);
					
					buf += 'C' + [cov(x1), cov(y1), cov(x2), cov(y2), cov(rx), cov(ry)].join(' ');
					lx = rx;
					ly = ry;
					if(contour[k + 1].onCurve) k += 1;
				} else {
					var rx = contour[0].x;
					var ry = contour[0].y;
					buf += 'Q' + cov(contour[k].x) + ' ' + cov(contour[k].y) + ' ' + cov(contour[0].x) + ' ' + cov(contour[0].y);
					lx = rx;
					ly = ry;
				}
				buf += 'Z\n'
			}
		}
		return buf;
	}
	var svg = '<?xml version="1.0" standalone="no"?><!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd" ><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1"><defs><font id="' + font.name.postScriptName + '">'
	
	var skew = (argv.uprightify ? 1 : 0) * Math.tan((font.post.italicAngle || 0) / 180 * Math.PI);
	var scale = (argv.upm || 1000) / 1000;
	
	svg += '<font-face font-family="' + font.name.fontFamily + '" font-weight="' + font['OS/2'].usWeightClass + '" font-stretch="normal" units-per-em="' + (1000 * scale) + '"/>'
	
	for(var j = 0; j < font.glyf.length; j++){
		var g = font.glyf[j];
		if(g.contours) {
			for(var k = 0; k < g.contours.length; k++) {
				var contour = g.contours[k];
				for(var p = 0; p < contour.length; p++) {
					contour[p].x += contour[p].y * skew;
					contour[p].x *= scale;
					contour[p].y *= scale;
				}
			}
			g.advanceWidth *= scale;
			Glyph.prototype.cleanup.call(g, 0.25);
		}
		var gd = '<' + (j === 0 ? 'missing-glyph' : 'glyph') + ' glyph-name="' + g.name + '" horiz-adv-x="' + g.advanceWidth + '" '+ (g.unicode && g.unicode.length ? 'unicode="&#x' + g.unicode[0].toString(16) + ';"' : '') +' d="' + toSVGPath(g) + '" />'
		svg += gd;
	}
	svg += '</font></defs></svg>'
	fs.writeFileSync(argv.svg, svg, 'utf-8')
};