Adds font metrics to support font commands.

This is part 1 of 3.  Rendering, screenshots, MathML, and unit tests will
follow in susbequent pull requests.

metrics/extract_tfms.py

@@ -31,7 +31,11 @@ def main():
         'cmsy10.tfm',
         'cmti10.tfm',
         'msam10.tfm',
-        'msbm10.tfm'
+        'msbm10.tfm',
+        'eufm10.tfm',
+        'cmtt10.tfm',
+        'rsfs10.tfm',
+        'cmss10.tfm',
     ]
 
     # Extracted by running `\font\a=<font>` and then `\showthe\skewchar\a` in
@@ -48,7 +52,11 @@ def main():
         'cmsy10': 48,
         'cmti10': None,
         'msam10': None,
-        'msbm10': None
+        'msbm10': None,
+        'eufm10': None,
+        'cmtt10': None,
+        'rsfs10': None,
+        'cmss10': None,
     }
 
     font_name_to_tfm = {}
@@ -68,7 +76,11 @@ def main():
             tex_char_num = int(char_data['char'])
             yshift = float(char_data['yshift'])
 
-            tfm_char = font_name_to_tfm[font].get_char_metrics(tex_char_num)
+            if family == "Script-Regular":
+                tfm_char = font_name_to_tfm[font].get_char_metrics(tex_char_num,
+                                                                   fix_rsfs=True)
+            else:
+                tfm_char = font_name_to_tfm[font].get_char_metrics(tex_char_num)
 
             height = round(tfm_char.height + yshift / 1000.0, 5)
             depth = round(tfm_char.depth - yshift / 1000.0, 5)

metrics/mapping.pl

@@ -153,7 +153,11 @@ $map{cmmi10} = {
   "Main-Italic" => [
     0x7B => 0x131,          # \imath
     0x7C => 0x237,          # \jmath
-  ]
+  ],
+
+  "Caligraphic-Regular" => [
+    [0x30,0x39] => 0x30,    # Oldstyle 0-9
+  ],
 };
 
 $map{cmsy10} = {
@@ -257,6 +261,10 @@ $map{cmsy10} = {
   "Math-Italic" => [
     0x36 => 0x2F            # \not
   ],
+
+  "Caligraphic-Regular" => [
+    [0x41,0x5A] => 0x41,    # A-Z
+  ],
 };
 
 $map{cmex10} = {
@@ -939,6 +947,106 @@ $map{msbm10} = {
   ],
 };
 
+$map{eufm10} = {
+  "Fraktur-Regular" => [
+    [0,7] => 0xE300,        # variants
+    0x12 => 0x2018,         # left quote
+    0x13 => 0x2019,         # right quote
+    0x21 => 0x21,           # !
+    [0x26,0x2F] => 0x26,    # &, ', (, ), *, +, comma, -, ., /
+    [0x30,0x39] => 0x30,    # 0-9
+    [0x3A,0x3B] => 0x3A,    # :, ;
+    0x3D => 0x3D,           # =
+    0x3F => 0x3F,           # ?
+    [0x41,0x5A] => 0x41,    # A-Z
+    0x5B => 0x5B,           # [
+    [0x5D,0x5E] => 0x5D,    # ], ^
+    [0x61,0x7A] => 0x61,    # a-z
+    0x7D => 0x22,           # "
+  ],
+};
+
+$map{cmtt10} = {
+  "Typewriter-Regular" => [
+    [0,1] => 0x393,         # \Gamma, \Delta
+    2 => 0x398,             # \Theta
+    3 => 0x39B,             # \Lambda
+    4 => 0x39E,             # \Xi
+    5 => 0x3A0,             # \Pi
+    6 => 0x3A3,             # \Sigma
+    [7,8] => 0x3A5,         # \Upsilon, \Phi
+    [9,0xA] => 0x3A8,       # \Psi, \Omega
+    0xD => 0x2032,          # '
+
+    0x10 => 0x131,          # \imath (roman)
+    0x11 => 0x237,          # \jmath (roman)
+    0x12 => [0x300,-525,0], # \grave (combining)
+    0x13 => [0x301,-525,0], # \acute (combining)
+    0x14 => [0x30C,-525,0], # \check (combining)
+    0x15 => [0x306,-525,0], # \breve (combining)
+    0x16 => [0x304,-525,0], # \bar (combining)
+    0x17 => [0x30A,-525,0], # ring above (combining)
+
+    [0x21,0x7F] => 0x21,
+
+    0x27 => 2018,           # left quote
+    0x60 => 2019,           # right quote
+    0x5E => [0x302,-525,0], # \hat (combining)
+    0x7E => [0x303,-525,0], # \tilde (combining)
+    0x7F => [0x308,-525,0], # \ddot (combining)
+  ],
+};
+
+$map{rsfs10} = {
+  "Script-Regular" => [
+    [0x41,0x5A] => 0x41,    # A-Z
+  ],
+};
+
+$map{cmss10} = {
+  "SansSerif-Regular" => [
+    [0,1] => 0x393,         # \Gamma, \Delta
+    2 => 0x398,             # \Theta
+    3 => 0x39B,             # \Lambda
+    4 => 0x39E,             # \Xi
+    5 => 0x3A0,             # \Pi
+    6 => 0x3A3,             # \Sigma
+    [7,8] => 0x3A5,         # \Upsilon, \Phi
+    [9,0xA] => 0x3A8,       # \Psi, \Omega
+
+    0x10 => 0x131,          # \imath (roman)
+    0x11 => 0x237,          # \jmath (roman)
+    0x12 => [0x300,-500,0], # \grave (combining)
+    0x13 => [0x301,-500,0], # \acute (combining)
+    0x14 => [0x30C,-500,0], # \check (combining)
+    0x15 => [0x306,-500,0], # \breve (combining)
+    0x16 => [0x304,-500,0], # \bar (combining)
+    0x17 => [0x30A,-542,0], # ring above (combining)
+
+    [0x21,0x2F] => 0x21,    # !, ", #, $, %, &, ', (, ), *, +, comma, -, ., /
+    0x22 => 0x201D,         # "
+    0x27 => 0x2019,         # '
+    [0x30,0x39] => 0x30,    # 0-9
+    [0x3A,0x3B] => 0x3A,    # :, ;
+    0x3D => 0x3D,           # =
+    [0x3F,0x40] => 0x3F,    # ?, @
+    [0x41,0x5A] => 0x41,    # A-Z
+    0x5B => 0x5B,           # [
+    0x5C => 0x201C,         # ``
+    [0x5D,0x5E] => 0x5D,    # ], ^
+    0x5E => [0x302,-500,0], # \hat (combining)
+    0x5F => [0x307,-389,0], # \dot (combining)
+    0x60 => 0x2018,         # `
+    [0x61,0x7A] => 0x61,    # a-z
+    [0x7B,0x7C] => 0x2013,  # \endash, \emdash
+    0x7B => [0x5F,0,-350],  # underline
+    0x7D => [0x30B,-500,0], # double acute (combining)
+    0x7E => [0x7E,0,-350],  # ~
+    0x7E => [0x303,-500,0], # \tilde (combining)
+    0x7F => [0x308,-500,0], # \ddot (combining)
+  ],
+};
+
 foreach $cmfont (keys %map) {
     foreach $mjfont (keys %{$map{$cmfont}}) {
         $style = $mjfont; $style =~ s/.*?(-|$)//; $style = "Regular" unless $style;

metrics/parse_tfm.py

@@ -64,11 +64,21 @@ class TfmFile(object):
         self.ligkern_program = LigKernProgram(ligkern_table)
         self.kern_table = kern_table
 
-    def get_char_metrics(self, char_num):
+    def get_char_metrics(self, char_num, fix_rsfs=False):
+        """Return glyph metrics for a unicode code point.
+
+        Arguments:
+            char_num: a unicode code point
+            fix_rsfs: adjust for rsfs10.tfm's different indexing system
+        """
         if char_num < self.start_char or char_num > self.end_char:
             raise RuntimeError("Invalid character number")
 
-        info = self.char_info[char_num + self.start_char]
+        if fix_rsfs:
+            # all of the char_nums contained start from zero in rsfs10.tfm
+            info = self.char_info[char_num - self.start_char]
+        else:
+            info = self.char_info[char_num + self.start_char]
 
         char_kern_table = {}
         if info.has_ligkern():