add initial marp implementation with sample content and build configuration

node_modules/katex/src/metrics/extract_tfms.py

@@ -0,0 +1,114 @@
+#!/usr/bin/env python3
+
+import collections
+import json
+import parse_tfm
+import subprocess
+import sys
+
+
+def find_font_path(font_name):
+    try:
+        font_path = subprocess.check_output(['kpsewhich', font_name])
+    except OSError:
+        raise RuntimeError("Couldn't find kpsewhich program, make sure you" +
+                           " have TeX installed")
+    except subprocess.CalledProcessError:
+        raise RuntimeError("Couldn't find font metrics: '%s'" % font_name)
+    return font_path.strip()
+
+
+def main():
+    mapping = json.load(sys.stdin)
+
+    fonts = [
+        'cmbsy10.tfm',
+        'cmbx10.tfm',
+        'cmbxti10.tfm',
+        'cmex10.tfm',
+        'cmmi10.tfm',
+        'cmmib10.tfm',
+        'cmr10.tfm',
+        'cmsy10.tfm',
+        'cmti10.tfm',
+        'msam10.tfm',
+        'msbm10.tfm',
+        'eufm10.tfm',
+        'cmtt10.tfm',
+        'rsfs10.tfm',
+        'cmss10.tfm',
+        'cmssbx10.tfm',
+        'cmssi10.tfm',
+    ]
+
+    # Extracted by running `\font\a=<font>` and then `\showthe\skewchar\a` in
+    # TeX, where `<font>` is the name of the font listed here. The skewchar
+    # will be printed out in the output. If it outputs `-1`, that means there
+    # is no skewchar, so we use `None` here.
+    font_skewchar = {
+        'cmbsy10': None,
+        'cmbx10': None,
+        'cmbxti10': None,
+        'cmex10': None,
+        'cmmi10': 127,
+        'cmmib10': None,
+        'cmr10': None,
+        'cmsy10': 48,
+        'cmti10': None,
+        'msam10': None,
+        'msbm10': None,
+        'eufm10': None,
+        'cmtt10': None,
+        'rsfs10': None,
+        'cmss10': None,
+        'cmssbx10': None,
+        'cmssi10': None,
+    }
+
+    font_name_to_tfm = {}
+
+    for font_name in fonts:
+        font_basename = font_name.split('.')[0]
+        font_path = find_font_path(font_name)
+        font_name_to_tfm[font_basename] = parse_tfm.read_tfm_file(font_path)
+
+    families = collections.defaultdict(dict)
+
+    for family, chars in mapping.items():
+        for char, char_data in chars.items():
+            char_num = int(char)
+
+            font = char_data['font']
+            tex_char_num = int(char_data['char'])
+            yshift = float(char_data['yshift'])
+
+            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)
+            italic = round(tfm_char.italic_correction, 5)
+            width = round(tfm_char.width, 5)
+
+            skewkern = 0.0
+            if (font_skewchar[font] and
+                    font_skewchar[font] in tfm_char.kern_table):
+                skewkern = round(
+                    tfm_char.kern_table[font_skewchar[font]], 5)
+
+            families[family][char_num] = {
+                'height': height,
+                'depth': depth,
+                'italic': italic,
+                'skew': skewkern,
+                'width': width
+            }
+
+    sys.stdout.write(
+        json.dumps(families, separators=(',', ':'), sort_keys=True))
+
+if __name__ == '__main__':
+    main()