α=1.# causes Formatter to error but should not

[kellertuer]

We just noticed a bug (we think) where correct Julia code is causing Formatter to error.

If you do

format_text("α=1.# Assigns α to 1.0")

The actual code is correct Julia code (sure not nice, one should write floats with an ending 0 here, but still)
but it errors with

ERROR: Parsing error for input occurred on line 1, offset: 3
Stacktrace:
 [1] error(s::String)
   @ Base ./error.jl:35
 [2] format_text(text::String, style::DefaultStyle, opts::JuliaFormatter.Options)
   @ JuliaFormatter ~/.julia/packages/JuliaFormatter/7y9aN/src/JuliaFormatter.jl:241
 [3] #format_text#280
   @ ~/.julia/packages/JuliaFormatter/7y9aN/src/JuliaFormatter.jl:215 [inlined]
 [4] format_text
   @ ~/.julia/packages/JuliaFormatter/7y9aN/src/JuliaFormatter.jl:212 [inlined]
 [5] #format_text#279
   @ ~/.julia/packages/JuliaFormatter/7y9aN/src/JuliaFormatter.jl:209 [inlined]
 [6] format_text(text::String)
   @ JuliaFormatter ~/.julia/packages/JuliaFormatter/7y9aN/src/JuliaFormatter.jl:208
 [7] top-level scope
   @ REPL[4]:1

adding the 0 or a space makes the formatting correctly (and adding the 0 for the case of the space)

If you format even

text = raw"""
       α=1.# A
       β=2.0
       """
format_text(text)

the lines are concatenated into one see the error with

ERROR: Error while PARSING formatted text:

1 α = 1.β = 2.0

...

Error occurred on line 1, offset 9 of formatted text.

The error might not be precisely on this line but it should be in the region of the code block. Try commenting the region out and see if that removes the error.
Stacktrace:
 [1] error(s::String)
   @ Base ./error.jl:35
 [2] format_text(cst::CSTParser.EXPR, style::DefaultStyle, s::JuliaFormatter.State)
   @ JuliaFormatter ~/.julia/packages/JuliaFormatter/7y9aN/src/JuliaFormatter.jl:314
 [3] format_text(text::String, style::DefaultStyle, opts::JuliaFormatter.Options)
   @ JuliaFormatter ~/.julia/packages/JuliaFormatter/7y9aN/src/JuliaFormatter.jl:243
 [4] #format_text#280
   @ ~/.julia/packages/JuliaFormatter/7y9aN/src/JuliaFormatter.jl:215 [inlined]
 [5] format_text
   @ ~/.julia/packages/JuliaFormatter/7y9aN/src/JuliaFormatter.jl:212 [inlined]
 [6] #format_text#279
   @ ~/.julia/packages/JuliaFormatter/7y9aN/src/JuliaFormatter.jl:209 [inlined]
 [7] format_text(text::String)
   @ JuliaFormatter ~/.julia/packages/JuliaFormatter/7y9aN/src/JuliaFormatter.jl:208
 [8] top-level scope
   @ REPL[7]:1

which might lead to misleading line numbers.

PS: In general formatter works great and I am very happy to use it and have a CI reminding me to format my code – thanks for the package!