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show_math.py

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+from latex2mathml.converter import convert as tex2mathml
+import re
+
+incomplete = '<font style="color:orange;" class="tooltip">&#9888;<span class="tooltiptext">formula incomplete</span></font>'
+convError = '<font style="color:red" class="tooltip">&#9888;<span class="tooltiptext">LaTeX-convert-error</span></font>'
+
+def convert(mdtex, extensions=[], splitParagraphs=True):
+    ''' converts recursively the Markdown-LaTeX-mixture to HTML with MathML '''
+    found = False
+    # handle all paragraphs separately (prevents aftereffects)
+    if splitParagraphs:
+        parts = re.split("\n\n", mdtex)
+        result = ''
+        for part in parts:
+            result += convert(part, extensions, splitParagraphs=False)
+        return result
+    # find first $$-formula:
+    parts = re.split('\${2}', mdtex, 2)
+    if len(parts)>1:
+        found = True
+        result = convert(parts[0], extensions, splitParagraphs=False)+'\n'
+        try:
+            result += '<div class="blockformula">'+tex2mathml(parts[1])+'</div>\n'
+        except:
+            result += '<div class="blockformula">'+convError+'</div>'
+        if len(parts)==3:
+            result += convert(parts[2], extensions, splitParagraphs=False)
+        else:
+            result += '<div class="blockformula">'+incomplete+'</div>'
+    # else find first $-formulas:
+    else:
+        parts = re.split('\${1}', mdtex, 2)
+    if len(parts)>1 and not found:
+        found = True
+        try:
+            mathml = tex2mathml(parts[1])
+        except:
+            mathml = convError
+        if parts[0].endswith('\n\n') or parts[0]=='': # make sure textblock starts before formula!
+            parts[0]=parts[0]+'&#x200b;'
+        if len(parts)==3:
+            result = convert(parts[0]+mathml+parts[2], extensions, splitParagraphs=False)
+        else:
+            result = convert(parts[0]+mathml+incomplete, extensions, splitParagraphs=False)
+    # else find first \[..\]-equation:
+    else:
+        parts = re.split(r'\\\[', mdtex, 1)
+    if len(parts)>1 and not found:
+        found = True
+        result = convert(parts[0], extensions, splitParagraphs=False)+'\n'
+        parts = re.split(r'\\\]', parts[1], 1)
+        try:
+            result += '<div class="blockformula">'+tex2mathml(parts[0])+'</div>\n'
+        except:
+            result += '<div class="blockformula">'+convError+'</div>'
+        if len(parts)==2:
+            result += convert(parts[1], extensions, splitParagraphs=False)
+        else:
+            result += '<div class="blockformula">'+incomplete+'</div>'
+    # else find first \(..\)-equation:
+    else:
+        parts = re.split(r'\\\(', mdtex, 1)
+    if len(parts)>1 and not found:
+        found = True
+        subp = re.split(r'\\\)', parts[1], 1)
+        try:
+            mathml = tex2mathml(subp[0])
+        except:
+            mathml = convError
+        if parts[0].endswith('\n\n') or parts[0]=='': # make sure textblock starts before formula!
+            parts[0]=parts[0]+'&#x200b;'
+        if len(subp)==2:
+            result = convert(parts[0]+mathml+subp[1], extensions, splitParagraphs=False)
+        else:
+            result = convert(parts[0]+mathml+incomplete, extensions, splitParagraphs=False)
+    if not found:
+        result = mdtex
+    return result