accent = Group( Combine(bslash + accent) + Optional(lbrace) + symbol + Optional(rbrace)).setParseAction(handler.accent).setName("accent")
symgroup = font ^ group ^ symbol
subscript << Group( Optional(symgroup) + Literal('_') + symgroup )
superscript << Group( Optional(symgroup) + Literal('^') + symgroup )
subsuperscript << Group( symgroup + Literal('_') + symgroup + Literal('^') + symgroup )
font << Group( Combine(bslash + fontname) + group)
expression = OneOrMore(
space ^ font ^ accent ^ symbol ^ subscript ^ superscript ^ subsuperscript ^ group ^ composite ).setParseAction(handler.expression).setName("expression")
#~ expression = OneOrMore(
#~ group | composite | space | font | subsuperscript | subscript | superscript | symbol ).setParseAction(handler.expression).setName("expression")
####
def math_parse_s_ft2font(s, dpi, fontsize, angle=0):
"""
Parse the math expression s, return the (bbox, fonts) tuple needed
to render it.
fontsize must be in points
#~ symbol = (texsym ^ char ^ binop ^ relation ^ punctuation ^ misc ^ grouping ).setParseAction(handler.symbol).leaveWhitespace()
_symbol = (texsym | char | binop | relation | punctuation | misc
| grouping).setParseAction(handler.symbol).leaveWhitespace()
subscript = Forward().setParseAction(handler.subscript).setName("subscript")
superscript = Forward().setParseAction(
handler.superscript).setName("superscript")
subsuperscript = Forward().setParseAction(
handler.subsuperscript).setName("subsuperscript")
font = Forward().setParseAction(handler.font).setName("font")
accent = Group(
Combine(bslash + accent) + Optional(lbrace) + symbol +
Optional(rbrace)).setParseAction(handler.accent).setName("accent")
group = Group(lbrace + OneOrMore(symbol ^ subscript ^ superscript
^ subsuperscript ^ space ^ font ^ accent) +
rbrace).setParseAction(handler.group).setName("group")
#~ group = Group( lbrace + OneOrMore(subsuperscript | subscript | superscript | symbol | space ) + rbrace).setParseAction(handler.group).setName("group")
#composite = Group( Combine(bslash + composite) + lbrace + symbol + rbrace + lbrace + symbol + rbrace).setParseAction(handler.composite).setName("composite")
#~ composite = Group( Combine(bslash + composite) + group + group).setParseAction(handler.composite).setName("composite")
composite = Group(Combine(bslash + overUnder) + group + group).setParseAction(
handler.composite).setName("composite")
symgroup = font | group | symbol
subscript << Group(Optional(symgroup) + Literal('_') + symgroup)
superscript << Group(Optional(symgroup) + Literal('^') + symgroup)
subsuperscript << Group(symgroup + Literal('_') + symgroup + Literal('^') +
symgroup)