Line break in formula causes exception

[cc-a]

Describe the bug
Trying to to load a Spreadsheet with a formula containing a linebreak fails with an exception:

File "/home/ccaveayl/projects/formulas/model2050.py", line 36, in init
self.model = formulas.ExcelModel().loads(str(xlsx_path)).finish()
File "/home/ccaveayl/projects/formulas/.venv/lib/python3.9/site-packages/formulas/excel/init.py", line 87, in loads
self.load(filename)
File "/home/ccaveayl/projects/formulas/.venv/lib/python3.9/site-packages/formulas/excel/init.py", line 92, in load
self.pushes(*book.worksheets, context=context)
File "/home/ccaveayl/projects/formulas/.venv/lib/python3.9/site-packages/formulas/excel/init.py", line 97, in pushes
self.push(ws, context=context)
File "/home/ccaveayl/projects/formulas/.venv/lib/python3.9/site-packages/formulas/excel/init.py", line 110, in push
self.add_cell(
File "/home/ccaveayl/projects/formulas/.venv/lib/python3.9/site-packages/formulas/excel/init.py", line 209, in add_cell
cell = Cell(crd, val, context=ctx).compile(references=references)
File "/home/ccaveayl/projects/formulas/.venv/lib/python3.9/site-packages/formulas/cell.py", line 73, in init
self.tokens, self.builder = self.parser.ast(value, context=context)
File "/home/ccaveayl/projects/formulas/.venv/lib/python3.9/site-packages/formulas/parser.py", line 53, in ast
token.ast(tokens, stack, builder)
File "/home/ccaveayl/projects/formulas/.venv/lib/python3.9/site-packages/formulas/tokens/operator.py", line 91, in ast
pred = self.pred
File "/home/ccaveayl/projects/formulas/.venv/lib/python3.9/site-packages/formulas/tokens/operator.py", line 76, in pred
return self._precedences[self.name]
KeyError: '\n'

To Reproduce

A minimal example is provided by test_line_break.xlsx.

Simply try to load this file with formulas.

Expected behavior

Spreadsheet should load correctly with line break ignored

Screenshots

N/A

Desktop (please complete the following information):

• OS: Arch Linux
• Version: N/A

Additional context

I've temporarily resolved this by changing:

formulas/formulas/cell.py

Line 73 in 2f097d2

self.tokens, self.builder = self.parser.ast(value, context=context)

to

    self.tokens, self.builder = self.parser.ast(value.replace("\n", ""), context=context) 

I suspect there is a better approach to resolving however. If you're able to advise on the best approach I'd be happy to put together a PR for this.

[cc-a]

Apologies just noticed this may be a duplicate of #61

[cc-a]

Already resolved on dev branch.