Mapytex/pymath/renders.py

#!/usr/bin/env python
# encoding: utf-8

from .render import Render
from .fraction import Fraction
from .formal import FormalExp
from .generic import first_elem

# ------------------------
# A console render

txt_infix = {"+": "+", "-": "-", "*": "*", "/" : "/", ":": ":", "^":"^"}
txt_postfix = {}
txt_other = {"(": "(", ")": ")"}

txt_render = Render(txt_infix, txt_postfix, txt_other)

# ------------------------
# A infix to postfix list convertor

p2i_infix = {"+": "+", "-": "-", "*": "*", "/" : "/", ":":":", "^":"^"}
p2i_postfix = {}
p2i_other = {"(": "(", ")": ")"}

post2in_fix = Render(p2i_infix, p2i_postfix, p2i_other, join = False)

# ------------------------
# A latex render

def texSlash(op1, op2):
    if not Render.isNumerande(op1) and op1[0] == "(" and op1[-1] == ")":
        op1 = op1[1:-1]
    if not Render.isNumerande(op2) and op2[0] == "(" and op2[-1] == ")":
        op2 = op2[1:-1]
    return ["\\frac{" , op1 , "}{" , op2 , "}"]

def texFrac(frac):
    return ["\\frac{" , str(frac._num) , "}{" , str(frac._denom) , "}"]

def texMult(op1,op2):
    fe = first_elem(op2)
    if type(fe) == FormalExp or fe.isalpha():
        if type(op1) == list and op1[0] == "(":
            return ["(", op1[1:-1], op2, ")"]
        else:
            return [op1, op2]
    else:
        return [op1, "\\times", op2]

tex_infix = {"+": " + ", "-": " - ", "*": texMult , ":": ":", "^":"^"}
tex_postfix = {"/": texSlash}
tex_other = {"(": "(", ")": ")"}
tex_type_render = {int: str, Fraction: texFrac, FormalExp: str}

tex_render = Render(tex_infix, tex_postfix, tex_other, type_render = tex_type_render)



if __name__ == '__main__':
    exp = [2, 5, '^', 1, '-', 3, 4, '*', ':']
    print(txt_render(exp))
    exp = [2, 5, '^', 1, '-', 3, 4, '*', '/', 3, 5, '/', ':']
    print(tex_render(exp))
    exp = [2, 5, '^', 1, '-', 3, 4, '*', '/', 3, '+']
    print(post2in_fix(exp))




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