Sure. Call me stupid, but what's a PR? I'll need some help with the procedure.
Are you using GIT or what? El miércoles, 3 de julio de 2013 18:18:02 UTC+2, Ondřej Čertík escribió: > > Excellent. > > Pablo, can you please send a PR with this? We'll then improve it there > and I can help with setting up the tests. Please ask if you get stuck. > > Ondrej > > On Wed, Jul 3, 2013 at 9:49 AM, Aaron Meurer <[email protected]<javascript:>> > wrote: > > Yes, definitely. Eventually, I would like to have a nice framework to > > make parsing things like this easier and have a nicer, more extensible > > API, but for now, I think even simple parsers like this are better > > than nothing. > > > > Aaron Meurer > > > > On Wed, Jul 3, 2013 at 10:48 AM, Ondřej Čertík > > <[email protected]<javascript:>> > wrote: > >> Pablo, > >> > >> On Wed, Jul 3, 2013 at 5:38 AM, peibol <[email protected] <javascript:>> > wrote: > >>> It will be something like that. For the moment, I'm just implemented > the > >>> basics of presentation mathml. I will add features as I need them. > >>> > >>> After running it, sympify should be called. What do you think about > it? > >>> > >>> def parseMML(mmlinput): > >>> from lxml import etree > >>> from StringIO import * > >>> from lxml import objectify > >>> mmlinput= mmlinput.replace(' xmlns="', ' xmlnamespace="') > >>> parser = > etree.XMLParser(ns_clean=True,remove_pis=True,remove_comments=True) > >>> tree = etree.parse(StringIO(mmlinput), parser) > >>> > objectify.deannotate(tree,cleanup_namespaces=True,xsi=True,xsi_nil=True) > >>> mmlinput=etree.tostring(tree.getroot()) > >>> exppy="" #this is the python expression > >>> symvars=[] #these are symbolic variables which can eventually take > part in > >>> the expression > >>> events = ("start", "end") > >>> level = 0 > >>> context = etree.iterparse(StringIO(mmlinput),events=events) > >>> for action, elem in context: > >>> if (action=='start') and (elem.tag=='mfrac'): > >>> level += 1 > >>> mmlaux=etree.tostring(elem[0]) > >>> (a,b)=parseMML(mmlaux) > >>> symvars.append(b) > >>> exppy+=a > >>> exppy+='/' > >>> mmlaux=etree.tostring(elem[1]) > >>> (a,b)=parseMML(mmlaux) > >>> symvars.append(b) > >>> exppy+=a > >>> if (action=='end') and (elem.tag=='mfrac'): > >>> level -= 1 > >>> if level: > >>> continue > >>> if (action=='start') and (elem.tag=='mrow'): > >>> exppy+='(' > >>> if (action=='end') and (elem.tag=='mrow'): > >>> exppy+=')' > >>> if action=='start' and elem.tag=='mn': #this is a number > >>> exppy+=elem.text > >>> if action=='start' and elem.tag=='mi': #this is a variable > >>> exppy+=elem.text > >>> symvars.append(elem.text) #we'll return the variable, so sympy can > sympify > >>> it afterwards > >>> if action=='start' and elem.tag=='mo': #this is a operation > >>> exppy+=elem.text > >>> return (exppy, symvars) > >>> > >>> > >>> With the example: mmlinput='''<?xml version="1.0"?> <math > >>> xmlns="http://www.w3.org/1998/Math/MathML"; > >>> xmlns:mml="http://www.w3.org/1998/Math/MathML"; > >>> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; > >>> xsi:schemaLocation="http://www.w3.org/1998/Math/MathML > >>> http://www.w3.org/Math/XMLSchema/mathml2/mathml2.xsd";> <mrow> <mfrac> > <mrow> > >>> <mn>3</mn> </mrow> <mrow> <mn>57</mn> </mrow> </mfrac> </mrow> > </math>''' > >>> > >>> We get: > >>> exppy='((3)/(57))' > >> > >> > >> I think that's a great start. I assume you pass the expression to > >> sympify() and obtain a SymPy expression as a result. > >> > >> Aaron, I think we should have this in sympy, what do you think? We can > >> install lxml in .travis.yml and have this tested. If so, I can help > >> you Pablo with sending a PR and get it setup. > >> > >> Ondrej > >> > >> -- > >> You received this message because you are subscribed to the Google > Groups "sympy" group. > >> To unsubscribe from this group and stop receiving emails from it, send > an email to [email protected] <javascript:>. > >> To post to this group, send email to [email protected]<javascript:>. > > >> Visit this group at http://groups.google.com/group/sympy. > >> For more options, visit https://groups.google.com/groups/opt_out. > >> > >> > > > > -- > > You received this message because you are subscribed to the Google > Groups "sympy" group. > > To unsubscribe from this group and stop receiving emails from it, send > an email to [email protected] <javascript:>. > > To post to this group, send email to [email protected]<javascript:>. > > > Visit this group at http://groups.google.com/group/sympy. > > For more options, visit https://groups.google.com/groups/opt_out. > > > > > -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/sympy. For more options, visit https://groups.google.com/groups/opt_out.
