Fraction Reduction rule

[justindujardin]

Add support for reducing fractions, layout.render_tree_to_text utility, and improved error reporting.

should probably update the poly simplify generation function to include fractions.

render_tree_to_text

from mathy_core import ExpressionParser
from mathy_core.layout import render_tree_to_text

parser = ExpressionParser()
expression = parser.parse("4x + 2x = 6x")
print(render_tree_to_text(expression))

                 =          
              ╱      ╲      
         +              *   
       ╱     ╲         ╱  ╲ 
   *           *     6     x
  ╱  ╲        ╱  ╲          
4     x     2     x         

Used for debugging fraction reduction rule errors, generally enriches test assertions:

E       ValueError: 
E       
E         unknown env: Expression value changed
E         
E               IN: (3x^2) / 6x = 6.0
E       
E               
E                /         
E              ╱     ╲     
E          *           *   
E         ╱  ╲        ╱  ╲ 
E       3     ^     6     x
E            ╱  ╲          
E          x     2         
E       
E               OUT: 1 / 2x = 0.041666666666666664
E       
E               
E          /      
E         ╱  ╲    
E       1     *   
E            ╱  ╲ 
E          2     x
E       
E               ERROR: 6.0 != 0.041666666666666664
E               
E       
E         Traceback:
E         ├─ test_rules_fraction_reduction in /home/user/mathy_core/tests/test_rules.py:63
E         ├─── run_rule_tests in /home/user/mathy_core/mathy_core/testing.py:108
E         └───── compare_expression_string_values in /home/user/mathy_core/mathy_core/util.py:41

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[codecov]

Codecov Report

Attention: Patch coverage is 90.98712% with 21 lines in your changes missing coverage. Please review.

Project coverage is 88.89%. Comparing base (8f09702) to head (6080631).

Files with missing lines	Patch %	Lines
mathy_core/util.py	84.53%	15 Missing ⚠️
mathy_core/layout.py	91.80%	5 Missing ⚠️
mathy_core/problems.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #24      +/-   ##
==========================================
+ Coverage   88.73%   88.89%   +0.16%     
==========================================
  Files          22       23       +1     
  Lines        2556     2729     +173     
==========================================
+ Hits         2268     2426     +158     
- Misses        288      303      +15     

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