Fix a small bug in the TOML parser and add an example of printing to …

…a file (#40208)

fix the TOML parser to parse 0e-3 and add an example of writing to a file

base/toml_parser.jl

@@ -821,8 +821,6 @@ function parse_number_or_date_start(l::Parser)
  ate && return parse_int(l, contains_underscore)
  elseif accept(l, isdigit)
  return parse_local_time(l)
- elseif peek(l) !== '.'
- return ParserError(ErrLeadingZeroNotAllowedInteger)
  end
  end
 

stdlib/TOML/docs/src/index.md

@@ -65,8 +65,6 @@ format.
 ```jldoctest
 julia> using TOML
 
-julia> fname = tempname();
-
 julia> data = Dict(
  "names" => ["Julia", "Julio"],
  "age" => [10, 20],
@@ -75,6 +73,17 @@ julia> data = Dict(
 julia> TOML.print(data)
 names = ["Julia", "Julio"]
 age = [10, 20]
+
+julia> fname = tempname();
+
+julia> open(fname, "w") do io
+ TOML.print(io, data)
+ end
+
+julia> TOML.parsefile(fname)
+Dict{String, Any} with 2 entries:
+ "names" => ["Julia", "Julio"]
+ "age" => [10, 20]
 ```
 
 Keys can be sorted according to some value

stdlib/TOML/test/values.jl

@@ -39,6 +39,7 @@ end
  @test testval("1.0e0" , 1.0)
  @test testval("1.0e+0" , 1.0)
  @test testval("1.0e-0" , 1.0)
+ @test testval("0e-3" , 0.0)
  @test testval("1.001e-0" , 1.001)
  @test testval("2e10" , 2e10)
  @test testval("2e+10" , 2e10)
@@ -53,8 +54,8 @@ end
  @test testval("+1_000" , 1000 |> Int64)
  @test testval("-1_000" , -1000 |> Int64)
 
- @test failval("0_" , Internals.ErrLeadingZeroNotAllowedInteger)
- @test failval("0__0" , Internals.ErrLeadingZeroNotAllowedInteger)
+ @test failval("0_" , Internals.ErrUnderscoreNotSurroundedByDigits)
+ @test failval("0__0" , Internals.ErrUnderscoreNotSurroundedByDigits)
  @test failval("__0" , Internals.ErrUnexpectedStartOfValue)
  @test failval("1_0_" , Internals.ErrTrailingUnderscoreNumber)
  @test failval("1_0__0" , Internals.ErrUnderscoreNotSurroundedByDigits)