How to get the original (source) floating-point literal?

[bellon-tiobe]

Hi,

I am writing an automatic check for a coding standard rule about writing digits on either side of the dot in floating-point literals, but I discovered that I cannot really check it, because the missing zero was added at some earlier time.

julia> import JuliaSyntax as JS

julia> JS.parsestmt(JS.SyntaxNode, ".5")
SyntaxNode:
0.5                                      :: Float

All my attempts to get the original input have failed. See these attempt I took with the help of Infiltrator:

infil> JS.sourcetext(node)
"0.5"

infil> string(node)
"0.5"

infil> JS.untokenize(node)
ERROR: MethodError: no method matching untokenize(::JuliaSyntax.SyntaxNode)
The function `untokenize` exists, but no method is defined for this combination of argument types.
  ...

infil> JS.untokenize(node.raw)
ERROR: MethodError: no method matching untokenize(::JuliaSyntax.GreenNode{JuliaSyntax.SyntaxHead})
The function `untokenize` exists, but no method is defined for this combination of argument types.
   ...

infil> JS.untokenize(JS.head(node.raw))
ERROR: TypeError: in typeassert, expected String, got a value of type Nothing
   ...

infil> JS.untokenize(JS.head(node))
ERROR: TypeError: in typeassert, expected String, got a value of type Nothing
   ...

Is it possible to get the original literal .5? How?

[pfitzseb]

Can't repro this:

julia> n = JS.parsestmt(JS.SyntaxNode, ".5")
line:col│ tree                                   │ file_name
   1:1  │0.5


julia> JS.sourcetext(n)
".5"

What version of JuliaSyntax/Julia are you on?

[bellon-tiobe]

julia> versioninfo()
Julia Version 1.11.5
Commit 760b2e5b739 (2025-04-14 06:53 UTC)
 ...

julia> Pkg.status("JuliaSyntax")
Project JuliaCheck v0.1.0
Status `~/Julia/JuliaCheck/Project.toml`
  [70703baa] JuliaSyntax v1.0.2

My Project.toml contains this:

[deps]
JuliaSyntax = "70703baa-626e-46a2-a12c-08ffd08c73b4"

[KristofferC]

So you don't get

julia> JS.sourcetext(n)
".5"

?

[bellon-tiobe]

I do! I am baffled... Calling sourcetext on the Float node is the first thing I tried. It is there, in the post I opened with. I don't understand.

I was using string(n) instead of sourcetext(n), but on the REPL opened by Infiltrator I did try sourcetext(n), and the "missing" 0 was already there. If that gives you an idea of what is going on, please reply, for future reference.