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latex.go
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//go:build !latex
// +build !latex
package canvas
import (
"bytes"
"fmt"
"math"
"strconv"
"strings"
"github.com/go-fonts/latin-modern/lmmath"
"github.com/go-fonts/latin-modern/lmmono10italic"
"github.com/go-fonts/latin-modern/lmmono10regular"
"github.com/go-fonts/latin-modern/lmmono12regular"
"github.com/go-fonts/latin-modern/lmmono8regular"
"github.com/go-fonts/latin-modern/lmmono9regular"
"github.com/go-fonts/latin-modern/lmmonocaps10regular"
"github.com/go-fonts/latin-modern/lmmonoslant10regular"
"github.com/go-fonts/latin-modern/lmroman10bold"
"github.com/go-fonts/latin-modern/lmroman10bolditalic"
"github.com/go-fonts/latin-modern/lmroman10italic"
"github.com/go-fonts/latin-modern/lmroman10regular"
"github.com/go-fonts/latin-modern/lmroman12bold"
"github.com/go-fonts/latin-modern/lmroman12italic"
"github.com/go-fonts/latin-modern/lmroman12regular"
"github.com/go-fonts/latin-modern/lmroman17regular"
"github.com/go-fonts/latin-modern/lmroman5bold"
"github.com/go-fonts/latin-modern/lmroman5regular"
"github.com/go-fonts/latin-modern/lmroman6bold"
"github.com/go-fonts/latin-modern/lmroman6regular"
"github.com/go-fonts/latin-modern/lmroman7bold"
"github.com/go-fonts/latin-modern/lmroman7italic"
"github.com/go-fonts/latin-modern/lmroman7regular"
"github.com/go-fonts/latin-modern/lmroman8bold"
"github.com/go-fonts/latin-modern/lmroman8italic"
"github.com/go-fonts/latin-modern/lmroman8regular"
"github.com/go-fonts/latin-modern/lmroman9bold"
"github.com/go-fonts/latin-modern/lmroman9italic"
"github.com/go-fonts/latin-modern/lmroman9regular"
"github.com/go-fonts/latin-modern/lmromancaps10regular"
"github.com/go-fonts/latin-modern/lmromandunh10regular"
"github.com/go-fonts/latin-modern/lmromanslant10bold"
"github.com/go-fonts/latin-modern/lmromanslant10regular"
"github.com/go-fonts/latin-modern/lmromanslant12regular"
"github.com/go-fonts/latin-modern/lmromanslant17regular"
"github.com/go-fonts/latin-modern/lmromanslant8regular"
"github.com/go-fonts/latin-modern/lmromanslant9regular"
"github.com/go-fonts/latin-modern/lmromanunsl10regular"
"github.com/go-fonts/latin-modern/lmsans10bold"
"github.com/go-fonts/latin-modern/lmsans10oblique"
"github.com/go-fonts/latin-modern/lmsans10regular"
"github.com/go-fonts/latin-modern/lmsans12oblique"
"github.com/go-fonts/latin-modern/lmsans12regular"
"github.com/go-fonts/latin-modern/lmsans17oblique"
"github.com/go-fonts/latin-modern/lmsans17regular"
"github.com/go-fonts/latin-modern/lmsans8oblique"
"github.com/go-fonts/latin-modern/lmsans8regular"
"github.com/go-fonts/latin-modern/lmsans9oblique"
"github.com/go-fonts/latin-modern/lmsans9regular"
"github.com/go-fonts/latin-modern/lmsansdemicond10regular"
"github.com/go-fonts/latin-modern/lmsansquot8oblique"
"github.com/go-fonts/latin-modern/lmsansquot8regular"
canvasFont "github.com/tdewolff/font"
"star-tex.org/x/tex"
)
var preamble = `\nopagenumbers
\def\frac#1#2{{{#1}\over{#2}}}
`
// ParseLaTeX parse a LaTeX formula (that what is between $...$) and returns a path.
func ParseLaTeX(formula string) (*Path, error) {
r := strings.NewReader(fmt.Sprintf(`%s $%s$`, preamble, formula))
w := &bytes.Buffer{}
stdout := &bytes.Buffer{}
engine := tex.NewEngine(stdout, bytes.NewReader([]byte{}))
if err := engine.Process(w, r); err != nil {
fmt.Println(stdout.String())
return nil, err
}
p, err := DVI2Path(w.Bytes(), newFonts())
if err != nil {
fmt.Println(stdout.String())
return nil, err
}
return p, nil
}
type dviFonts struct {
font map[string]*dviFont
mathSyms *dviFont // always available as backup for any rune
}
type dviFont struct {
sfnt *canvasFont.SFNT
cmap map[uint32]rune
size float64
italic bool
ex bool // is it cmex?
mathSyms *dviFont // always available as backup for any rune
}
func newFonts() *dviFonts {
return &dviFonts{
font: map[string]*dviFont{},
}
}
func (fs *dviFonts) Get(name string, scale float64) DVIFont {
i := 0
for i < len(name) && 'a' <= name[i] && name[i] <= 'z' {
i++
}
fontname := name[:i]
fontsize := 10.0
if ifontsize, err := strconv.Atoi(name[i:]); err == nil {
fontsize = float64(ifontsize)
}
if fs.mathSyms == nil {
fs.mathSyms = fs.loadFont("cmsy", cmapCMSY, 10.0, scale, lmmath.TTF)
}
cmap := cmapCMR
f, ok := fs.font[name]
if !ok {
var fontSizes map[float64][]byte
switch fontname {
case "cmb", "cmbx":
fontSizes = map[float64][]byte{
12.0: lmroman12bold.TTF,
10.0: lmroman10bold.TTF,
9.0: lmroman9bold.TTF,
8.0: lmroman8bold.TTF,
7.0: lmroman7bold.TTF,
6.0: lmroman6bold.TTF,
5.0: lmroman5bold.TTF,
}
case "cmbsy":
cmap = cmapCMSY
fontSizes = map[float64][]byte{
fontsize: lmmath.TTF,
}
case "cmbxsl":
fontSizes = map[float64][]byte{
fontsize: lmromanslant10bold.TTF,
}
case "cmbxti":
fontSizes = map[float64][]byte{
10.0: lmroman10bolditalic.TTF,
}
case "cmcsc":
cmap = cmapCMTT
fontSizes = map[float64][]byte{
10.0: lmromancaps10regular.TTF,
}
case "cmdunh":
fontSizes = map[float64][]byte{
10.0: lmromandunh10regular.TTF,
}
case "cmex":
cmap = cmapCMEX
fontSizes = map[float64][]byte{
fontsize: lmmath.TTF,
}
case "cmitt":
cmap = cmapCMTT
fontSizes = map[float64][]byte{
10.0: lmmono10italic.TTF,
}
case "cmmi":
cmap = cmapCMMI
fontSizes = map[float64][]byte{
12.0: lmroman12italic.TTF,
10.0: lmroman10italic.TTF,
9.0: lmroman9italic.TTF,
8.0: lmroman8italic.TTF,
7.0: lmroman7italic.TTF,
}
case "cmmib":
cmap = cmapCMMI
fontSizes = map[float64][]byte{
10.0: lmroman10bolditalic.TTF,
}
case "cmr":
fontSizes = map[float64][]byte{
17.0: lmroman17regular.TTF,
12.0: lmroman12regular.TTF,
10.0: lmroman10regular.TTF,
9.0: lmroman9regular.TTF,
8.0: lmroman8regular.TTF,
7.0: lmroman7regular.TTF,
6.0: lmroman6regular.TTF,
5.0: lmroman5regular.TTF,
}
case "cmsl":
fontSizes = map[float64][]byte{
17.0: lmromanslant17regular.TTF,
12.0: lmromanslant12regular.TTF,
10.0: lmromanslant10regular.TTF,
9.0: lmromanslant9regular.TTF,
8.0: lmromanslant8regular.TTF,
}
case "cmsltt":
fontSizes = map[float64][]byte{
10.0: lmmonoslant10regular.TTF,
}
case "cmss":
fontSizes = map[float64][]byte{
17.0: lmsans17regular.TTF,
12.0: lmsans12regular.TTF,
10.0: lmsans10regular.TTF,
9.0: lmsans9regular.TTF,
8.0: lmsans8regular.TTF,
}
case "cmssb", "cmssbx":
fontSizes = map[float64][]byte{
10.0: lmsans10bold.TTF,
}
case "cmssdc":
fontSizes = map[float64][]byte{
10.0: lmsansdemicond10regular.TTF,
}
case "cmssi":
fontSizes = map[float64][]byte{
17.0: lmsans17oblique.TTF,
12.0: lmsans12oblique.TTF,
10.0: lmsans10oblique.TTF,
9.0: lmsans9oblique.TTF,
8.0: lmsans8oblique.TTF,
}
case "cmssq":
fontSizes = map[float64][]byte{
8.0: lmsansquot8regular.TTF,
}
case "cmssqi":
fontSizes = map[float64][]byte{
8.0: lmsansquot8oblique.TTF,
}
case "cmsy":
cmap = cmapCMSY
fontSizes = map[float64][]byte{
fontsize: lmmath.TTF,
}
case "cmtcsc":
cmap = cmapCMTT
fontSizes = map[float64][]byte{
10.0: lmmonocaps10regular.TTF,
}
//case "cmtex":
//cmap = nil
case "cmti":
fontSizes = map[float64][]byte{
12.0: lmroman12italic.TTF,
10.0: lmroman10italic.TTF,
9.0: lmroman9italic.TTF,
8.0: lmroman8italic.TTF,
7.0: lmroman7italic.TTF,
}
case "cmtt":
cmap = cmapCMTT
fontSizes = map[float64][]byte{
12.0: lmmono12regular.TTF,
10.0: lmmono10regular.TTF,
9.0: lmmono9regular.TTF,
8.0: lmmono8regular.TTF,
}
case "cmu":
fontSizes = map[float64][]byte{
10.0: lmromanunsl10regular.TTF,
}
//case "cmvtt":
//cmap = cmapCTT
default:
fmt.Println("WARNING: unknown font", fontname)
}
// select closest matching font size
var data []byte
var size float64
for isize, idata := range fontSizes {
if data == nil || math.Abs(isize-fontsize) < math.Abs(size-fontsize) {
data = idata
size = isize
}
}
f = fs.loadFont(fontname, cmap, fontsize, scale, data)
fs.font[name] = f
}
return f
}
func (fs *dviFonts) loadFont(fontname string, cmap map[uint32]rune, fontsize, scale float64, data []byte) *dviFont {
sfnt, err := canvasFont.ParseSFNT(data, 0)
if err != nil {
fmt.Println("ERROR: %w", err)
}
// calculate size correction if the found font has a different font size than requested
fsize := scale * fontsize * mmPerPt / float64(sfnt.Head.UnitsPerEm)
//fsizeCorr := fontsize / size
isItalic := 0 < len(fontname) && fontname[len(fontname)-1] == 'i'
fsizeCorr := 1.0
isEx := fontname == "cmex"
return &dviFont{sfnt, cmap, fsizeCorr * fsize, isItalic, isEx, fs.mathSyms}
}
func (f *dviFont) Draw(p canvasFont.Pather, x, y float64, cid uint32) float64 {
face := f.sfnt
r := f.cmap[cid]
gid := face.GlyphIndex(r)
if gid == 0 {
if f.mathSyms != nil {
face = f.mathSyms.sfnt
gid = face.GlyphIndex(r)
if gid == 0 {
fmt.Println("rune not found in mathSyms:", string(r))
}
} else {
fmt.Println("rune not found:", string(r))
}
}
if f.italic {
x -= f.size * float64(face.OS2.SxHeight) / 2.0 * math.Tan(-face.Post.ItalicAngle*math.Pi/180.0)
}
size := f.size
xsc := 1.0
if f.ex {
_, ymin, _, ymax := face.GlyphBounds(gid)
yb := float64(max(ymin, ymax))
if exsc, has := cmexScales[cid]; has {
size *= exsc
}
switch cid {
case 0x5A, 0x49: // \int and \oint are off in large size
yb += 200
case 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F:
// larger delims are too thick
xsc = .7
case 0x20, 0x21, 0x22, 0x23, 0x28, 0x29, 0x2A, 0x2B:
// same for even larger ones
xsc = .6
case 0x3C, 0x3D: // braces middles need shifting
yb += 150
case 0x3A, 0x3B: // braces bottom shifting
yb += 400
// below are fixes for all the square root elements
case 0x71:
x += size * 80
xsc = .6
case 0x72:
x -= size * 80
xsc = .6
case 0x73:
x -= size * 80
xsc = .5
case 0x74:
yb += 600
case 0x75:
x += size * 560
case 0x76:
x += size * 400
yb -= 36
}
y -= size * yb
}
// note: need a way to separately multiply the x scaling here:
_ = xsc
_ = face.GlyphPath(p, gid, 0, x, y, size, canvasFont.NoHinting)
return size * float64(face.GlyphAdvance(gid)) // in mm
}
const (
// magnification factors that seem to work: not quite official tex but sorta
mag1 = 1.2
mag2 = 1.2 * 1.2
mag3 = 1.2 * 1.2 * 1.2
mag4 = 1.2 * 1.2 * 1.2 * 1.2 * 1.2
mag5 = 3.2
)
// cmexScales has per-character (original ASCII numbers) scaling factors
// for the cmex10 font.
var cmexScales = map[uint32]float64{
0x00: mag1,
0x01: mag1,
0x02: mag1,
0x03: mag1,
0x04: mag1,
0x05: mag1,
0x06: mag1,
0x07: mag1,
0x08: mag1,
0x0A: mag1,
0x0B: mag1,
0x0C: mag1,
0x0D: mag1,
0x0E: mag1,
0x0F: mag1,
0x10: mag3, // (
0x11: mag3, // )
0x12: mag4, // (
0x13: mag4, // )
0x14: mag4, // [
0x15: mag4, // ]
0x16: mag4, // ⌊
0x17: mag4, // ⌋
0x18: mag4, // ⌈
0x19: mag4, // ⌉
0x1A: mag4, // {
0x1B: mag4, // }
0x1C: mag4, // 〈
0x1D: mag4, // 〉
0x1E: mag4, // ∕
0x1F: mag4, // \
0x20: mag5, // (
0x21: mag5, // )
0x22: mag5, // [
0x23: mag5, // ]
0x24: mag5, // ⌊
0x25: mag5, // ⌋
0x26: mag5, // ⌈
0x27: mag5, // ⌉
0x28: mag5, // {
0x29: mag5, // }
0x2A: mag5, // 〈
0x2B: mag5, // 〉
0x2C: mag5, // ∕
0x2D: mag5, // \
0x2E: mag3, // ∕
0x2F: mag3, // \
0x30: mag2, // ⎛
0x31: mag2, // ⎞
0x32: mag2, // ⌈
0x33: mag2, // ⌉
0x34: mag2, // ⌊
0x35: mag2, // ⌋
0x36: mag2, // ⎢
0x37: mag2, // ⎥
0x38: mag2, // ⎧ // big braces start
0x39: mag2, // ⎫
0x3A: mag2, // ⎩
0x3B: mag2, // ⎭
0x3C: mag2, // ⎨
0x3D: mag2, // ⎬
0x3E: mag2, // ⎪
0x3F: mag2, // ∣ ?? unclear
0x40: mag2, // ⎝ // big parens
0x41: mag2, // ⎠
0x42: mag2, // ⎜
0x43: mag2, // ⎟
0x44: mag2, // 〈
0x45: mag2, // 〉
0x47: mag2, // ⨆
0x49: mag2, // ∮
0x4B: mag2, // ⨀
0x4D: mag2, // ⨁
0x4F: mag2, // ⨂
0x58: mag2, // ∑
0x59: mag2, // ∏
0x5A: mag2, // ∫
0x5B: mag2, // ⋃
0x5C: mag2, // ⋂
0x5D: mag2, // ⨄
0x5E: mag2, // ⋀
0x5F: mag2, // ⋁
0x61: mag2, // ∐
0x63: mag2, // ̂
0x64: mag4, // ̂
0x66: mag2, // ˜
0x67: mag4, // ˜
0x68: mag3, // [
0x69: mag3, // ]
0x6B: mag2, // ⌋
0x6C: mag2, // ⌈
0x6D: mag2, // ⌉
0x6E: mag3, // {
0x6F: mag3, // }
0x71: mag3, // √
0x72: mag4, // √
0x73: mag5, // √
0x74: mag1, // ⎷
0x75: mag1, // ⏐
0x76: mag1, // ⌜
}
var cmapCMR = map[uint32]rune{
0x00: '\u0393',
0x01: '\u0394',
0x02: '\u0398',
0x03: '\u039B',
0x04: '\u039E',
0x05: '\u03A0',
0x06: '\u03A3',
0x07: '\u03A5',
0x08: '\u03A6',
0x09: '\u03A8',
0x0A: '\u03A9',
0x0B: '\uFB00',
0x0C: '\uFB01',
0x0D: '\uFB02',
0x0E: '\uFB03',
0x0F: '\uFB04',
0x10: '\u0131',
0x11: '\u0237',
0x12: '\u0300',
0x13: '\u0301',
0x14: '\u030C',
0x15: '\u0306',
0x16: '\u0305',
0x17: '\u030A',
0x18: '\u0327',
0x19: '\u00DF',
0x1A: '\u00E6',
0x1B: '\u0153',
0x1C: '\u00F8',
0x1D: '\u00C6',
0x1E: '\u0152',
0x1F: '\u00D8',
0x20: '\u0337',
0x21: '\u0021',
0x22: '\u201D',
0x23: '\u0023',
0x24: '\u0024',
0x25: '\u0025',
0x26: '\u0026',
0x27: '\u0027',
0x28: '\u0028',
0x29: '\u0029',
0x2A: '\u002A',
0x2B: '\u002B',
0x2C: '\u002C',
0x2D: '\u002D',
0x2E: '\u002E',
0x2F: '\u002F',
0x30: '\u0030',
0x31: '\u0031',
0x32: '\u0032',
0x33: '\u0033',
0x34: '\u0034',
0x35: '\u0035',
0x36: '\u0036',
0x37: '\u0037',
0x38: '\u0038',
0x39: '\u0039',
0x3A: '\u003A',
0x3B: '\u003B',
0x3C: '\u00A1',
0x3D: '\u003D',
0x3E: '\u00BF',
0x3F: '\u003F',
0x40: '\u0040',
0x41: '\u0041',
0x42: '\u0042',
0x43: '\u0043',
0x44: '\u0044',
0x45: '\u0045',
0x46: '\u0046',
0x47: '\u0047',
0x48: '\u0048',
0x49: '\u0049',
0x4A: '\u004A',
0x4B: '\u004B',
0x4C: '\u004C',
0x4D: '\u004D',
0x4E: '\u004E',
0x4F: '\u004F',
0x50: '\u0050',
0x51: '\u0051',
0x52: '\u0052',
0x53: '\u0053',
0x54: '\u0054',
0x55: '\u0055',
0x56: '\u0056',
0x57: '\u0057',
0x58: '\u0058',
0x59: '\u0059',
0x5A: '\u005A',
0x5B: '\u005B',
0x5C: '\u201C',
0x5D: '\u005D',
0x5E: '\u0302',
0x5F: '\u0307',
0x60: '\u2018',
0x61: '\u0061',
0x62: '\u0062',
0x63: '\u0063',
0x64: '\u0064',
0x65: '\u0065',
0x66: '\u0066',
0x67: '\u0067',
0x68: '\u0068',
0x69: '\u0069',
0x6A: '\u006A',
0x6B: '\u006B',
0x6C: '\u006C',
0x6D: '\u006D',
0x6E: '\u006E',
0x6F: '\u006F',
0x70: '\u0070',
0x71: '\u0071',
0x72: '\u0072',
0x73: '\u0073',
0x74: '\u0074',
0x75: '\u0075',
0x76: '\u0076',
0x77: '\u0077',
0x78: '\u0078',
0x79: '\u0079',
0x7A: '\u007A',
0x7B: '\u2013',
0x7C: '\u2014',
0x7D: '\u030B',
0x7E: '\u0303',
0x7F: '\u0308',
}
var cmapCMMI = map[uint32]rune{
0x00: '\u0393',
0x01: '\u0394',
0x02: '\u0398',
0x03: '\u039B',
0x04: '\u039E',
0x05: '\u03A0',
0x06: '\u03A3',
0x07: '\u03A5',
0x08: '\u03A6',
0x09: '\u03A8',
0x0A: '\u03A9',
0x0B: '\u03B1',
0x0C: '\u03B2',
0x0D: '\u03B3',
0x0E: '\u03B4',
0x0F: '\u03B5',
0x10: '\u03B6',
0x11: '\u03B7',
0x12: '\u03B8',
0x13: '\u03B9',
0x14: '\u03BA',
0x15: '\u03BB',
0x16: '\u03BC',
0x17: '\u03BD',
0x18: '\u03BE',
0x19: '\u03C0',
0x1A: '\u03C1',
0x1B: '\u03C3',
0x1C: '\u03C4',
0x1D: '\u03C5',
0x1E: '\u03C6',
0x1F: '\u03C7',
0x20: '\u03C8',
0x21: '\u03C9',
0x22: '\u025B',
0x23: '\u03D1',
0x24: '\u03D6',
0x25: '\u03F1',
0x26: '\u03C2',
0x27: '\u03D5',
0x28: '\u21BC',
0x29: '\u21BD',
0x2A: '\u21C0',
0x2B: '\u21C1',
0x2C: '\u21AA',
0x2D: '\u21A9',
0x2E: '\u25B9',
0x2F: '\u25C3',
0x30: '\u0030',
0x31: '\u0031',
0x32: '\u0032',
0x33: '\u0033',
0x34: '\u0034',
0x35: '\u0035',
0x36: '\u0036',
0x37: '\u0037',
0x38: '\u0038',
0x39: '\u0039',
0x3A: '\u002E',
0x3B: '\u002C',
0x3C: '\u003C',
0x3D: '\u002F',
0x3E: '\u003E',
0x3F: '\u22C6',
0x40: '\u2202',
0x41: '\u0041',
0x42: '\u0042',
0x43: '\u0043',
0x44: '\u0044',
0x45: '\u0045',
0x46: '\u0046',
0x47: '\u0047',
0x48: '\u0048',
0x49: '\u0049',
0x4A: '\u004A',
0x4B: '\u004B',
0x4C: '\u004C',
0x4D: '\u004D',
0x4E: '\u004E',
0x4F: '\u004F',
0x50: '\u0050',
0x51: '\u0051',
0x52: '\u0052',
0x53: '\u0053',
0x54: '\u0054',
0x55: '\u0055',
0x56: '\u0056',
0x57: '\u0057',
0x58: '\u0058',
0x59: '\u0059',
0x5A: '\u005A',
0x5B: '\u266D',
0x5C: '\u266E',
0x5D: '\u266F',
0x5E: '\u2323',
0x5F: '\u2322',
0x60: '\u2113',
0x61: '\u0061',
0x62: '\u0062',
0x63: '\u0063',
0x64: '\u0064',
0x65: '\u0065',
0x66: '\u0066',
0x67: '\u0067',
0x68: '\u0068',
0x69: '\u0069',
0x6A: '\u006A',
0x6B: '\u006B',
0x6C: '\u006C',
0x6D: '\u006D',
0x6E: '\u006E',
0x6F: '\u006F',
0x70: '\u0070',
0x71: '\u0071',
0x72: '\u0072',
0x73: '\u0073',
0x74: '\u0074',
0x75: '\u0075',
0x76: '\u0076',
0x77: '\u0077',
0x78: '\u0078',
0x79: '\u0079',
0x7A: '\u007A',
0x7B: '\u0131',
0x7C: '\u0237',
0x7D: '\u2118',
0x7E: '\u20D7',
0x7F: '\u0311',
}
var cmapCMSY = map[uint32]rune{
0x00: '\u2212',
0x01: '\u00B7',
0x02: '\u00D7',
0x03: '\u22C6',
0x04: '\u00F7',
0x05: '\u22C4',
0x06: '\u00B1',
0x07: '\u2213',
0x08: '\u2295',
0x09: '\u2296',
0x0A: '\u2297',
0x0B: '\u2298',
0x0C: '\u2299',
0x0D: '\u25CB',
0x0E: '\u2218',
0x0F: '\u2219',
0x10: '\u2243',
0x11: '\u224D',
0x12: '\u2286',
0x13: '\u2287',
0x14: '\u2264',
0x15: '\u2265',
0x16: '\u227C',
0x17: '\u227D',
0x18: '\u223C',
0x19: '\u2245',
0x1A: '\u2282',
0x1B: '\u2283',
0x1C: '\u226A',
0x1D: '\u226B',
0x1E: '\u227A',
0x1F: '\u227B',
0x20: '\u2190',
0x21: '\u2192',
0x22: '\u2191',
0x23: '\u2193',
0x24: '\u2194',
0x25: '\u2197',
0x26: '\u2198',
0x27: '\u2242',
0x28: '\u21D0',
0x29: '\u21D2',
0x2A: '\u21D1',
0x2B: '\u21D3',
0x2C: '\u21D4',
0x2D: '\u2196',
0x2E: '\u2199',
0x2F: '\u221D',
0x30: '\u2032',
0x31: '\u221E',
0x32: '\u2208',
0x33: '\u220B',
0x34: '\u25B3',
0x35: '\u25BD',
0x36: '\u0338',
0x37: '\u21A6',
0x38: '\u2200',
0x39: '\u2203',
0x3A: '\u00AC',
0x3B: '\u2205',
0x3C: '\u211C',
0x3D: '\u2111',
0x3E: '\u22A4',
0x3F: '\u22A5',
0x40: '\u2135',
0x41: '\U0001D49C',
0x42: '\u212C',
0x43: '\U0001D49E',
0x44: '\U0001D49F',
0x45: '\u2130',
0x46: '\u2131',
0x47: '\U0001D4A2',
0x48: '\u210B',
0x49: '\u2110',
0x4A: '\U0001D4A5',
0x4B: '\U0001D4A6',
0x4C: '\u2112',
0x4D: '\u2133',
0x4E: '\U0001D4A9',
0x4F: '\U0001D4AA',
0x50: '\U0001D4AB',
0x51: '\U0001D4AC',
0x52: '\u211B',
0x53: '\U0001D4AE',
0x54: '\U0001D4AF',
0x55: '\U0001D4B0',
0x56: '\U0001D4B1',
0x57: '\U0001D4B2',
0x58: '\U0001D4B3',
0x59: '\U0001D4B4',
0x5A: '\U0001D4B5',
0x5B: '\u222A',
0x5C: '\u2229',
0x5D: '\u228E',
0x5E: '\u2227',
0x5F: '\u2228',
0x60: '\u22A2',
0x61: '\u22A3',
0x62: '\u230A',
0x63: '\u230B',
0x64: '\u2308',
0x65: '\u2309',
0x66: '\u007B',
0x67: '\u007D',
0x68: '\u2329',
0x69: '\u232A',
0x6A: '\u2223',
0x6B: '\u2225',
0x6C: '\u2195',
0x6D: '\u21D5',
0x6E: '\u2216',
0x6F: '\u2240',
0x70: '\u221A',
0x71: '\u2210',
0x72: '\u2207',
0x73: '\u222B',
0x74: '\u2294',
0x75: '\u2293',
0x76: '\u2291',
0x77: '\u2292',
0x78: '\u00A7',
0x79: '\u2020',
0x7A: '\u2021',
0x7B: '\u00B6',
0x7C: '\u2663',
0x7D: '\u2662',
0x7E: '\u2661',
0x7F: '\u2660',
}
// See Figure 6, Appendix F, The TeXbook, D. E. Knuth, 1984, 1986, 1991
var cmapCMEX = map[uint32]rune{
0x00: '\u0028', // (
0x01: '\u0029', // )
0x02: '\u005B', // [
0x03: '\u005D', // ]
0x04: '\u230A', // ⌊
0x05: '\u230B', // ⌋
0x06: '\u2308', // ⌈
0x07: '\u2309', // ⌉
0x08: '\u007B', // {
0x09: '\u007D', // }
0x0A: '\u2329', // 〈
0x0B: '\u232A', // 〉
0x0C: '\u2223', // ∣
0x0D: '\u2225', // ∥
0x0E: '\u2215', // ∕
0x0F: '\u2216', // \
0x10: '\u0028', // ( mag3
0x11: '\u0029', // ) mag3
0x12: '\u0028', // ( mag4
0x13: '\u0029', // ) mag4
0x14: '\u005B', // [ mag4
0x15: '\u005D', // ] mag4
0x16: '\u230A', // ⌊ mag4
0x17: '\u230B', // ⌋ mag4
0x18: '\u2308', // ⌈ mag4
0x19: '\u2309', // ⌉ mag4
0x1A: '\u007B', // { mag4
0x1B: '\u007D', // } mag4
0x1C: '\u2329', // 〈 mag4
0x1D: '\u232A', // 〉 mag4
0x1E: '\u2215', // ∕ mag4
0x1F: '\u2216', // \ mag4
0x20: '\u0028', // ( mag5
0x21: '\u0029', // ) mag5
0x22: '\u005B', // [ mag5
0x23: '\u005D', // ] mag5
0x24: '\u230A', // ⌊ mag5
0x25: '\u230B', // ⌋ mag5
0x26: '\u2308', // ⌈ mag5
0x27: '\u2309', // ⌉ mag5
0x28: '\u007B', // { mag5
0x29: '\u007D', // } mag5
0x2A: '\u2329', // 〈 mag5
0x2B: '\u232A', // 〉 mag5
0x2C: '\u2215', // ∕ mag5
0x2D: '\u2216', // \ mag5
0x2E: '\u2215', // ∕ mag3
0x2F: '\u2216', // \ mag3
0x30: '\u239B', // ⎛ mag2
0x31: '\u239E', // ⎞ mag2
0x32: '\u23A1', // ⎡ mag2 note: thicker series here
0x33: '\u23A4', // ⎤ "
0x34: '\u23A3', // ⎣ "
0x35: '\u23A6', // ⎦ "
0x36: '\u23A2', // ⎢ "
0x37: '\u23A5', // ⎥ "
0x38: '\u23A7', // ⎧ braces mag2
0x39: '\u23AB', // ⎫
0x3A: '\u23A9', // ⎩
0x3B: '\u23AD', // ⎭
0x3C: '\u23A8', // ⎨
0x3D: '\u23AC', // ⎬
0x3E: '\u23AA', // ⎪
0x3F: '\u2223', // ∣ ?? unclear
0x40: '\u239D', // ⎝ mag2
0x41: '\u23A0', // ⎠ mag2
0x42: '\u239C', // ⎜ mag2
0x43: '\u239F', // ⎟ mag2
0x44: '\u2329', // 〈 mag2
0x45: '\u232A', // 〉 mag2
0x46: '\u2A06', // ⨆
0x47: '\u2A06', // ⨆ mag2
0x48: '\u222E', // ∮
0x49: '\u222E', // ∮ mag2
0x4A: '\u2A00', // ⨀
0x4B: '\u2A00', // ⨀ mag2
0x4C: '\u2A01', // ⨁
0x4D: '\u2A01', // ⨁ mag2
0x4E: '\u2A02', // ⨂
0x4F: '\u2A02', // ⨂ mag2
0x50: '\u2211', // ∑
0x51: '\u220F', // ∏
0x52: '\u222B', // ∫
0x53: '\u22C3', // ⋃
0x54: '\u22C2', // ⋂
0x55: '\u2A05', // ⨄
0x56: '\u22C0', // ⋀
0x57: '\u22C1', // ⋁
0x58: '\u2211', // ∑ mag2
0x59: '\u220F', // ∏ mag2
0x5A: '\u222B', // ∫ mag2
0x5B: '\u22C3', // ⋃ mag2
0x5C: '\u22C2', // ⋂ mag2
0x5D: '\u2A03', // ⨄ mag2
0x5E: '\u22C0', // ⋀ mag2
0x5F: '\u22C1', // ⋁ mag2
0x60: '\u2210', // ∐
0x61: '\u2210', // ∐ mag2