Update lists of operators/keywords in Julia and expand/refine highlighting (#1715)

* [julia] Update operators, keywords, and literal lists

* [julia] Support symbol macros

* [julia] Parse '..' operator juxtaposed with integers

* [julia] Identify Symbol literals

* [julia] Consume strings/commands faster & add triple-quoted command

* [julia] Support identifying operators with custom suffixes

* [julia] Add parsing for raw strings

* [julia] Share definition of interpolation

* [julia] Identify escaped ` and $ in commands

* [julia] Support non-standard string and commmand literals with flags

* [julia] Support variable names with interior exclamations

* [julia] Fix matching floats starting with decimal

* [julia] Compress nearly duplicate number matches with optional group

* [julia] Match double-underscored float literal

* [julia] Match hex float literals

* [julia] Test more non-numerical literal expressions

* [julia] Tag types in type contexts

* [julia] Identify console via `julia-repl` as well

* [julia] Be more conservative in identifying symbols

* [julia] Update example file to v1.6 `base/strings/string.jl`

* Address one CI failure

* Switch to non-emoji Unicode category So example

Hopefully fixes pypy3 CI failure

* fixup: remove duplicate operators already in DOTTED_OPERATORS_LIST

* [julia] Fix backslash operator

* [julia] List `true`, `false` with builtin names, not keywords

9 files changed, 1276 insertions, 0 deletions

diff --git a/tests/snippets/julia-repl/test_repl.txt b/tests/snippets/julia-repl/test_repl.txt
new file mode 100644
index 00000000..798f0047
--- /dev/null
+++ b/tests/snippets/julia-repl/test_repl.txt
@@ -0,0 +1,51 @@
+Tests separating Julia's commands from output in REPL-like code blocks
+
+---input---
+julia> f(x) = sin(π/2x)
+f (generic function with 1 method)
+
+julia> @. f(1:2)
+2-element Vector{Float64}:
+ 1.0
+ 0.7071067811865475
+
+---tokens---
+'julia>'      Generic.Prompt
+' '           Text
+'f'           Name
+'('           Punctuation
+'x'           Name
+')'           Punctuation
+' '           Text
+'='           Operator
+' '           Text
+'sin'         Name
+'('           Punctuation
+'π'           Name.Builtin
+'/'           Operator
+'2'           Literal.Number.Integer
+'x'           Name
+')'           Punctuation
+'\n'          Text
+
+'f (generic function with 1 method)\n' Generic.Output
+
+'\n'          Generic.Output
+
+'julia>'      Generic.Prompt
+' '           Text
+'@.'          Name.Decorator
+' '           Text
+'f'           Name
+'('           Punctuation
+'1'           Literal.Number.Integer
+':'           Operator
+'2'           Literal.Number.Integer
+')'           Punctuation
+'\n'          Text
+
+'2-element Vector{Float64}:\n' Generic.Output
+
+' 1.0\n'      Generic.Output
+
+' 0.7071067811865475\n' Generic.Output
diff --git a/tests/snippets/julia/test_keywords.txt b/tests/snippets/julia/test_keywords.txt
new file mode 100644
index 00000000..235c411c
--- /dev/null
+++ b/tests/snippets/julia/test_keywords.txt
@@ -0,0 +1,89 @@
+# Test keywords are identified
+
+---input---
+mutable struct MutableType end
+struct ImmutableType end
+abstract type AbstractMyType end
+primitive type MyPrimitive 32 end
+(abstract, mutable, type) = true, π, missing
+
+abstract    type AbstractMyType end
+primitive 	type MyPrimitive 32 end
+mutable     struct MutableType end
+
+---tokens---
+'mutable struct' Keyword
+' '           Text
+'MutableType' Keyword.Type
+' '           Text
+'end'         Keyword
+'\n'          Text
+
+'struct'      Keyword
+' '           Text
+'ImmutableType' Keyword.Type
+' '           Text
+'end'         Keyword
+'\n'          Text
+
+'abstract type' Keyword
+' '           Text
+'AbstractMyType' Keyword.Type
+' '           Text
+'end'         Keyword
+'\n'          Text
+
+'primitive type' Keyword
+' '           Text
+'MyPrimitive' Keyword.Type
+' '           Text
+'32'          Literal.Number.Integer
+' '           Text
+'end'         Keyword
+'\n'          Text
+
+'('           Punctuation
+'abstract'    Name
+','           Punctuation
+' '           Text
+'mutable'     Name
+','           Punctuation
+' '           Text
+'type'        Name
+')'           Punctuation
+' '           Text
+'='           Operator
+' '           Text
+'true'        Name.Builtin
+','           Punctuation
+' '           Text
+'π'           Name.Builtin
+','           Punctuation
+' '           Text
+'missing'     Name.Builtin
+'\n'          Text
+
+'\n'          Text
+
+'abstract    type' Keyword
+' '           Text
+'AbstractMyType' Keyword.Type
+' '           Text
+'end'         Keyword
+'\n'          Text
+
+'primitive \ttype' Keyword
+' '           Text
+'MyPrimitive' Keyword.Type
+' '           Text
+'32'          Literal.Number.Integer
+' '           Text
+'end'         Keyword
+'\n'          Text
+
+'mutable     struct' Keyword
+' '           Text
+'MutableType' Keyword.Type
+' '           Text
+'end'         Keyword
+'\n'          Text
diff --git a/tests/snippets/julia/test_macros.txt b/tests/snippets/julia/test_macros.txt
new file mode 100644
index 00000000..8dc27187
--- /dev/null
+++ b/tests/snippets/julia/test_macros.txt
@@ -0,0 +1,56 @@
+# Test that macros are parsed, including ones which are defined as symbols
+
+---input---
+@generated function
+@. a + b
+@~ a + b
+@± a + b
+@mymacro(a, b)
+@+¹ᵀ a
+
+---tokens---
+'@generated'  Name.Decorator
+' '           Text
+'function'    Keyword
+'\n'          Text
+
+'@.'          Name.Decorator
+' '           Text
+'a'           Name
+' '           Text
+'+'           Operator
+' '           Text
+'b'           Name
+'\n'          Text
+
+'@~'          Name.Decorator
+' '           Text
+'a'           Name
+' '           Text
+'+'           Operator
+' '           Text
+'b'           Name
+'\n'          Text
+
+'@±'          Name.Decorator
+' '           Text
+'a'           Name
+' '           Text
+'+'           Operator
+' '           Text
+'b'           Name
+'\n'          Text
+
+'@mymacro'    Name.Decorator
+'('           Punctuation
+'a'           Name
+','           Punctuation
+' '           Text
+'b'           Name
+')'           Punctuation
+'\n'          Text
+
+'@+¹ᵀ'        Name.Decorator
+' '           Text
+'a'           Name
+'\n'          Text
diff --git a/tests/snippets/julia/test_names.txt b/tests/snippets/julia/test_names.txt
new file mode 100644
index 00000000..338f483f
--- /dev/null
+++ b/tests/snippets/julia/test_names.txt
@@ -0,0 +1,148 @@
+# Test that the range of Julia variable names are correctly identified
+
+---input---
+a # single character variable
+a_simple_name
+_leading_underscore
+5implicit_mul
+6_more_mul
+nums1
+nums_2
+nameswith!
+multiple!!
+embedded!_inthemiddle
+embed!1
+prime_suffix′
+for_each # starts with keyword substring
+
+# variables with characters > \u00A1
+ð # category Ll
+Aʺ # category Lm -- \U02BA (MODIFIER LETTER DOUBLE PRIME), not \U2033 (DOUBLE PRIME)
+א # category Lo
+Ð # category Lu
+A̅ # category Mn -- \U0305 (COMBINING OVERLINE)
+ⅿ # category Nl -- \U217F (SMALL ROMAN NUMERAL ONE THOUSAND)
+A₁ # category No
+A² # category No
+€ # category Sc
+© # category So
+
+# number-like names
+𝟙 # category Nd
+𝟏 # category Nd
+
+---tokens---
+'a'           Name
+' '           Text
+'# single character variable' Comment
+'\n'          Text
+
+'a_simple_name' Name
+'\n'          Text
+
+'_leading_underscore' Name
+'\n'          Text
+
+'5'           Literal.Number.Integer
+'implicit_mul' Name
+'\n'          Text
+
+'6'           Literal.Number.Integer
+'_more_mul'   Name
+'\n'          Text
+
+'nums1'       Name
+'\n'          Text
+
+'nums_2'      Name
+'\n'          Text
+
+'nameswith!'  Name
+'\n'          Text
+
+'multiple!!'  Name
+'\n'          Text
+
+'embedded!_inthemiddle' Name
+'\n'          Text
+
+'embed!1'     Name
+'\n'          Text
+
+'prime_suffix′' Name
+'\n'          Text
+
+'for_each'    Name
+' '           Text
+'# starts with keyword substring' Comment
+'\n'          Text
+
+'\n'          Text
+
+'# variables with characters > \\u00A1' Comment
+'\n'          Text
+
+'ð'           Name
+' '           Text
+'# category Ll' Comment
+'\n'          Text
+
+'Aʺ'          Name
+' '           Text
+'# category Lm -- \\U02BA (MODIFIER LETTER DOUBLE PRIME), not \\U2033 (DOUBLE PRIME)' Comment
+'\n'          Text
+
+'א'           Name
+' '           Text
+'# category Lo' Comment
+'\n'          Text
+
+'Ð'           Name
+' '           Text
+'# category Lu' Comment
+'\n'          Text
+
+'A̅'          Name
+' '           Text
+'# category Mn -- \\U0305 (COMBINING OVERLINE)' Comment
+'\n'          Text
+
+'ⅿ'           Name
+' '           Text
+'# category Nl -- \\U217F (SMALL ROMAN NUMERAL ONE THOUSAND)' Comment
+'\n'          Text
+
+'A₁'          Name
+' '           Text
+'# category No' Comment
+'\n'          Text
+
+'A²'          Name
+' '           Text
+'# category No' Comment
+'\n'          Text
+
+'€'           Name
+' '           Text
+'# category Sc' Comment
+'\n'          Text
+
+'©'           Name
+' '           Text
+'# category So' Comment
+'\n'          Text
+
+'\n'          Text
+
+'# number-like names' Comment
+'\n'          Text
+
+'𝟙'           Name
+' '           Text
+'# category Nd' Comment
+'\n'          Text
+
+'𝟏'           Name
+' '           Text
+'# category Nd' Comment
+'\n'          Text
diff --git a/tests/snippets/julia/test_numbers.txt b/tests/snippets/julia/test_numbers.txt
new file mode 100644
index 00000000..5c572438
--- /dev/null
+++ b/tests/snippets/julia/test_numbers.txt
@@ -0,0 +1,261 @@
+# Tests identification of number forms
+
+---input---
+# floats
+  1e1   1e+1   1e-1
+1.1e1 1.1e+1 1.1e-1 .1e1 .1_1e1 1_1.1e1 1.1_1e1 1.1_11e1
+1.1E1 1.1E+1 1.1E-1 .1E1 .1_1E1 1_1.1E1 1.1_1E1 1.1_11E1
+1.1f1 1.1f+1 1.1f-1 .1f1 .1_1f1 1_1.1f1 1.1_1f1 1.1_11f1
+1E1   1E+1   1E-1
+1f1   1f+1   1f-1
+.1  1.  1.1  1.1_1  1.1_11  .1_1  .1_11 1_1.1_1
+# hex floats
+0x1p1 0xa_bp10 0x01_ap11 0x01_abp1
+0x1.1p1 0xA.Bp10 0x0.1_Ap9 0x0_1.Ap1 0x0_1.A_Bp9
+
+# integers
+1 01 10_1 10_11
+
+# non-decimal
+0xf 0xf_0 0xfff_000
+0o7 0o7_0 0o777_000
+0b1 0b1_0 0b111_000
+
+# invalid in Julia - out of range values
+0xg 0o8 0b2 0x1pA
+# invalid in Julia - no trailing underscores
+1_ 1.1_ 0xf_ 0o7_ 0b1_ 0xF_p1
+# parsed as juxtaposed numeral + variable in Julia (no underscores in exponents)
+1e1_1 1E1_1 1f1_1 0xfp1_1
+
+# not floats -- range-like expression parts
+1..1  ..1  1..
+
+---tokens---
+'# floats'    Comment
+'\n'          Text
+
+'  '          Text
+'1e1'         Literal.Number.Float
+'   '         Text
+'1e+1'        Literal.Number.Float
+'   '         Text
+'1e-1'        Literal.Number.Float
+'\n'          Text
+
+'1.1e1'       Literal.Number.Float
+' '           Text
+'1.1e+1'      Literal.Number.Float
+' '           Text
+'1.1e-1'      Literal.Number.Float
+' '           Text
+'.1e1'        Literal.Number.Float
+' '           Text
+'.1_1e1'      Literal.Number.Float
+' '           Text
+'1_1.1e1'     Literal.Number.Float
+' '           Text
+'1.1_1e1'     Literal.Number.Float
+' '           Text
+'1.1_11e1'    Literal.Number.Float
+'\n'          Text
+
+'1.1E1'       Literal.Number.Float
+' '           Text
+'1.1E+1'      Literal.Number.Float
+' '           Text
+'1.1E-1'      Literal.Number.Float
+' '           Text
+'.1E1'        Literal.Number.Float
+' '           Text
+'.1_1E1'      Literal.Number.Float
+' '           Text
+'1_1.1E1'     Literal.Number.Float
+' '           Text
+'1.1_1E1'     Literal.Number.Float
+' '           Text
+'1.1_11E1'    Literal.Number.Float
+'\n'          Text
+
+'1.1f1'       Literal.Number.Float
+' '           Text
+'1.1f+1'      Literal.Number.Float
+' '           Text
+'1.1f-1'      Literal.Number.Float
+' '           Text
+'.1f1'        Literal.Number.Float
+' '           Text
+'.1_1f1'      Literal.Number.Float
+' '           Text
+'1_1.1f1'     Literal.Number.Float
+' '           Text
+'1.1_1f1'     Literal.Number.Float
+' '           Text
+'1.1_11f1'    Literal.Number.Float
+'\n'          Text
+
+'1E1'         Literal.Number.Float
+'   '         Text
+'1E+1'        Literal.Number.Float
+'   '         Text
+'1E-1'        Literal.Number.Float
+'\n'          Text
+
+'1f1'         Literal.Number.Float
+'   '         Text
+'1f+1'        Literal.Number.Float
+'   '         Text
+'1f-1'        Literal.Number.Float
+'\n'          Text
+
+'.1'          Literal.Number.Float
+'  '          Text
+'1.'          Literal.Number.Float
+'  '          Text
+'1.1'         Literal.Number.Float
+'  '          Text
+'1.1_1'       Literal.Number.Float
+'  '          Text
+'1.1_11'      Literal.Number.Float
+'  '          Text
+'.1_1'        Literal.Number.Float
+'  '          Text
+'.1_11'       Literal.Number.Float
+' '           Text
+'1_1.1_1'     Literal.Number.Float
+'\n'          Text
+
+'# hex floats' Comment
+'\n'          Text
+
+'0x1p1'       Literal.Number.Float
+' '           Text
+'0xa_bp10'    Literal.Number.Float
+' '           Text
+'0x01_ap11'   Literal.Number.Float
+' '           Text
+'0x01_abp1'   Literal.Number.Float
+'\n'          Text
+
+'0x1.1p1'     Literal.Number.Float
+' '           Text
+'0xA.Bp10'    Literal.Number.Float
+' '           Text
+'0x0.1_Ap9'   Literal.Number.Float
+' '           Text
+'0x0_1.Ap1'   Literal.Number.Float
+' '           Text
+'0x0_1.A_Bp9' Literal.Number.Float
+'\n'          Text
+
+'\n'          Text
+
+'# integers'  Comment
+'\n'          Text
+
+'1'           Literal.Number.Integer
+' '           Text
+'01'          Literal.Number.Integer
+' '           Text
+'10_1'        Literal.Number.Integer
+' '           Text
+'10_11'       Literal.Number.Integer
+'\n'          Text
+
+'\n'          Text
+
+'# non-decimal' Comment
+'\n'          Text
+
+'0xf'         Literal.Number.Hex
+' '           Text
+'0xf_0'       Literal.Number.Hex
+' '           Text
+'0xfff_000'   Literal.Number.Hex
+'\n'          Text
+
+'0o7'         Literal.Number.Oct
+' '           Text
+'0o7_0'       Literal.Number.Oct
+' '           Text
+'0o777_000'   Literal.Number.Oct
+'\n'          Text
+
+'0b1'         Literal.Number.Bin
+' '           Text
+'0b1_0'       Literal.Number.Bin
+' '           Text
+'0b111_000'   Literal.Number.Bin
+'\n'          Text
+
+'\n'          Text
+
+'# invalid in Julia - out of range values' Comment
+'\n'          Text
+
+'0'           Literal.Number.Integer
+'xg'          Name
+' '           Text
+'0'           Literal.Number.Integer
+'o8'          Name
+' '           Text
+'0'           Literal.Number.Integer
+'b2'          Name
+' '           Text
+'0x1'         Literal.Number.Hex
+'pA'          Name
+'\n'          Text
+
+'# invalid in Julia - no trailing underscores' Comment
+'\n'          Text
+
+'1'           Literal.Number.Integer
+'_'           Name
+' '           Text
+'1.1'         Literal.Number.Float
+'_'           Name
+' '           Text
+'0xf'         Literal.Number.Hex
+'_'           Name
+' '           Text
+'0o7'         Literal.Number.Oct
+'_'           Name
+' '           Text
+'0b1'         Literal.Number.Bin
+'_'           Name
+' '           Text
+'0xF'         Literal.Number.Hex
+'_p1'         Name
+'\n'          Text
+
+'# parsed as juxtaposed numeral + variable in Julia (no underscores in exponents)' Comment
+'\n'          Text
+
+'1e1'         Literal.Number.Float
+'_1'          Name
+' '           Text
+'1E1'         Literal.Number.Float
+'_1'          Name
+' '           Text
+'1f1'         Literal.Number.Float
+'_1'          Name
+' '           Text
+'0xfp1'       Literal.Number.Float
+'_1'          Name
+'\n'          Text
+
+'\n'          Text
+
+'# not floats -- range-like expression parts' Comment
+'\n'          Text
+
+'1'           Literal.Number.Integer
+'..'          Operator
+'1'           Literal.Number.Integer
+'  '          Text
+'..'          Operator
+'1'           Literal.Number.Integer
+'  '          Text
+'1'           Literal.Number.Integer
+'..'          Operator
+'\n'          Text
diff --git a/tests/snippets/julia/test_operators.txt b/tests/snippets/julia/test_operators.txt
new file mode 100644
index 00000000..017a48e9
--- /dev/null
+++ b/tests/snippets/julia/test_operators.txt
@@ -0,0 +1,172 @@
+# Test that operators --- dotted and unicode --- are identified correctly.
+
+---input---
+a += b.c
+a .÷= .~b.c
+a = !b ⋆ c!
+a = b ? c : d ⊕ e
+a = √(5)
+a -> (a...) .+ 1
+a \ b
+1..2
+a = a === b
+a <: T
+a >: T
+a::T
+[adjoint]'
+(identity)''
+adjoint'''
+transpose'ᵀ
+suffixed +¹ operator
+suffixed +¹²³ operator
+
+---tokens---
+'a'           Name
+' '           Text
+'+='          Operator
+' '           Text
+'b'           Name
+'.'           Operator
+'c'           Name
+'\n'          Text
+
+'a'           Name
+' '           Text
+'.÷='         Operator
+' '           Text
+'.~'          Operator
+'b'           Name
+'.'           Operator
+'c'           Name
+'\n'          Text
+
+'a'           Name
+' '           Text
+'='           Operator
+' '           Text
+'!'           Operator
+'b'           Name
+' '           Text
+'⋆'           Operator
+' '           Text
+'c!'          Name
+'\n'          Text
+
+'a'           Name
+' '           Text
+'='           Operator
+' '           Text
+'b'           Name
+' '           Text
+'?'           Operator
+' '           Text
+'c'           Name
+' '           Text
+':'           Operator
+' '           Text
+'d'           Name
+' '           Text
+'⊕'           Operator
+' '           Text
+'e'           Name
+'\n'          Text
+
+'a'           Name
+' '           Text
+'='           Operator
+' '           Text
+'√'           Operator
+'('           Punctuation
+'5'           Literal.Number.Integer
+')'           Punctuation
+'\n'          Text
+
+'a'           Name
+' '           Text
+'->'          Operator
+' '           Text
+'('           Punctuation
+'a'           Name
+'...'         Operator
+')'           Punctuation
+' '           Text
+'.+'          Operator
+' '           Text
+'1'           Literal.Number.Integer
+'\n'          Text
+
+'a'           Name
+' '           Text
+'\\'          Operator
+' '           Text
+'b'           Name
+'\n'          Text
+
+'1'           Literal.Number.Integer
+'..'          Operator
+'2'           Literal.Number.Integer
+'\n'          Text
+
+'a'           Name
+' '           Text
+'='           Operator
+' '           Text
+'a'           Name
+' '           Text
+'==='         Operator
+' '           Text
+'b'           Name
+'\n'          Text
+
+'a'           Keyword.Type
+' '           Text
+'<:'          Operator
+' '           Text
+'T'           Keyword.Type
+'\n'          Text
+
+'a'           Keyword.Type
+' '           Text
+'>:'          Operator
+' '           Text
+'T'           Keyword.Type
+'\n'          Text
+
+'a'           Name
+'::'          Operator
+'T'           Keyword.Type
+'\n'          Text
+
+'['           Punctuation
+'adjoint'     Name
+']'           Punctuation
+"'"           Operator
+'\n'          Text
+
+'('           Punctuation
+'identity'    Name
+')'           Punctuation
+"''"          Operator
+'\n'          Text
+
+'adjoint'     Name
+"'''"         Operator
+'\n'          Text
+
+'transpose'   Name
+"'ᵀ"          Operator
+'\n'          Text
+
+'suffixed'    Name
+' '           Text
+'+¹'          Operator
+' '           Text
+'operator'    Name
+'\n'          Text
+
+'suffixed'    Name
+' '           Text
+'+¹²³'        Operator
+' '           Text
+'operator'    Name
+'\n'          Text
diff --git a/tests/snippets/julia/test_strings.txt b/tests/snippets/julia/test_strings.txt
new file mode 100644
index 00000000..436bfe3c
--- /dev/null
+++ b/tests/snippets/julia/test_strings.txt
@@ -0,0 +1,225 @@
+# Tests string forms
+
+---input---
+"global function"
+"An $interpolated variable"
+"An $(a + 1) expression"
+"""a"""
+"""
+global function
+de e f
+"inner string"
+"""
+raw"\\ a \" $interp $(1 + 1) \""
+raw"""
+"inner string"
+$interp
+$(1 + 1)
+"""
+# commented "string"
+
+@sprintf "%0.2f" var
+v"1.0"
+var"#nonstandard#"
+
+r"^[abs]+$"m
+arbi"trary"suff
+arbi"trary"1234
+
+`global function`
+`abc \` \$ $interpolated`
+`abc $(a + 1)`
+```a```
+```
+global function
+"thing" ` \$
+`now` $(now())
+```
+# commented `command`
+
+arbi`trary`suff
+arbi`trary`1234
+
+---tokens---
+'"'           Literal.String
+'global function' Literal.String
+'"'           Literal.String
+'\n'          Text
+
+'"'           Literal.String
+'An '         Literal.String
+'$interpolated' Literal.String.Interpol
+' variable'   Literal.String
+'"'           Literal.String
+'\n'          Text
+
+'"'           Literal.String
+'An '         Literal.String
+'$'           Literal.String.Interpol
+'('           Punctuation
+'a'           Name
+' '           Text
+'+'           Operator
+' '           Text
+'1'           Literal.Number.Integer
+')'           Punctuation
+' expression' Literal.String
+'"'           Literal.String
+'\n'          Text
+
+'"""'         Literal.String
+'a'           Literal.String
+'"""'         Literal.String
+'\n'          Text
+
+'"""'         Literal.String
+'\nglobal function\nde e f\n' Literal.String
+
+'"'           Literal.String
+'inner string' Literal.String
+'"'           Literal.String
+'\n'          Literal.String
+
+'"""'         Literal.String
+'\n'          Text
+
+'raw'         Literal.String.Affix
+'"'           Literal.String
+'\\\\ a '     Literal.String
+'\\"'         Literal.String.Escape
+' $interp $(1 + 1) ' Literal.String
+'\\"'         Literal.String.Escape
+'"'           Literal.String
+'\n'          Text
+
+'raw'         Literal.String.Affix
+'"""'         Literal.String
+'\n"inner string"\n$interp\n$(1 + 1)\n' Literal.String
+
+'"""'         Literal.String
+'\n'          Text
+
+'# commented "string"' Comment
+'\n'          Text
+
+'\n'          Text
+
+'@sprintf'    Name.Decorator
+' '           Text
+'"'           Literal.String
+'%0.2f'       Literal.String.Interpol
+'"'           Literal.String
+' '           Text
+'var'         Name
+'\n'          Text
+
+'v'           Literal.String.Affix
+'"'           Literal.String
+'1.0'         Literal.String
+'"'           Literal.String
+'\n'          Text
+
+'var'         Literal.String.Affix
+'"'           Literal.String
+'#nonstandard#' Literal.String
+'"'           Literal.String
+'\n'          Text
+
+'\n'          Text
+
+'r'           Literal.String.Affix
+'"'           Literal.String.Regex
+'^[abs]+$'    Literal.String.Regex
+'"'           Literal.String.Regex
+'m'           Literal.String.Affix
+'\n'          Text
+
+'arbi'        Literal.String.Affix
+'"'           Literal.String
+'trary'       Literal.String
+'"'           Literal.String
+'suff'        Literal.String.Affix
+'\n'          Text
+
+'arbi'        Literal.String.Affix
+'"'           Literal.String
+'trary'       Literal.String
+'"'           Literal.String
+'1234'        Literal.String.Affix
+'\n'          Text
+
+'\n'          Text
+
+'`'           Literal.String.Backtick
+'global function' Literal.String.Backtick
+'`'           Literal.String.Backtick
+'\n'          Text
+
+'`'           Literal.String.Backtick
+'abc '        Literal.String.Backtick
+'\\`'         Literal.String.Escape
+' '           Literal.String.Backtick
+'\\$'         Literal.String.Escape
+' '           Literal.String.Backtick
+'$interpolated' Literal.String.Interpol
+'`'           Literal.String.Backtick
+'\n'          Text
+
+'`'           Literal.String.Backtick
+'abc '        Literal.String.Backtick
+'$'           Literal.String.Interpol
+'('           Punctuation
+'a'           Name
+' '           Text
+'+'           Operator
+' '           Text
+'1'           Literal.Number.Integer
+')'           Punctuation
+'`'           Literal.String.Backtick
+'\n'          Text
+
+'```'         Literal.String.Backtick
+'a'           Literal.String.Backtick
+'```'         Literal.String.Backtick
+'\n'          Text
+
+'```'         Literal.String.Backtick
+'\nglobal function\n"thing" ' Literal.String.Backtick
+'`'           Literal.String.Backtick
+' '           Literal.String.Backtick
+'\\$'         Literal.String.Escape
+'\n'          Literal.String.Backtick
+
+'`'           Literal.String.Backtick
+'now'         Literal.String.Backtick
+'`'           Literal.String.Backtick
+' '           Literal.String.Backtick
+'$'           Literal.String.Interpol
+'('           Punctuation
+'now'         Name
+'('           Punctuation
+')'           Punctuation
+')'           Punctuation
+'\n'          Literal.String.Backtick
+
+'```'         Literal.String.Backtick
+'\n'          Text
+
+'# commented `command`' Comment
+'\n'          Text
+
+'\n'          Text
+
+'arbi'        Literal.String.Affix
+'`'           Literal.String.Backtick
+'trary'       Literal.String.Backtick
+'`'           Literal.String.Backtick
+'suff'        Literal.String.Affix
+'\n'          Text
+
+'arbi'        Literal.String.Affix
+'`'           Literal.String.Backtick
+'trary'       Literal.String.Backtick
+'`'           Literal.String.Backtick
+'1234'        Literal.String.Affix
+'\n'          Text
diff --git a/tests/snippets/julia/test_symbols.txt b/tests/snippets/julia/test_symbols.txt
new file mode 100644
index 00000000..8b85a8e1
--- /dev/null
+++ b/tests/snippets/julia/test_symbols.txt
@@ -0,0 +1,78 @@
+# Tests that symbols are parsed as special literals
+
+---input---
+:abc_123
+:abc_def
+:α
+Val{:mysymbol}
+
+# non-symbols
+a:b
+1:b
+1.:b
+a::T
+a<:T
+a>:T
+UInt(1):UInt(2)
+
+---tokens---
+':abc_123'    Literal.String.Symbol
+'\n'          Text
+
+':abc_def'    Literal.String.Symbol
+'\n'          Text
+
+':α'          Literal.String.Symbol
+'\n'          Text
+
+'Val'         Keyword.Type
+'{'           Punctuation
+':mysymbol'   Literal.String.Symbol
+'}'           Punctuation
+'\n'          Text
+
+'\n'          Text
+
+'# non-symbols' Comment
+'\n'          Text
+
+'a'           Name
+':'           Operator
+'b'           Name
+'\n'          Text
+
+'1'           Literal.Number.Integer
+':'           Operator
+'b'           Name
+'\n'          Text
+
+'1.'          Literal.Number.Float
+':'           Operator
+'b'           Name
+'\n'          Text
+
+'a'           Name
+'::'          Operator
+'T'           Keyword.Type
+'\n'          Text
+
+'a'           Keyword.Type
+'<:'          Operator
+'T'           Keyword.Type
+'\n'          Text
+
+'a'           Keyword.Type
+'>:'          Operator
+'T'           Keyword.Type
+'\n'          Text
+
+'UInt'        Keyword.Type
+'('           Punctuation
+'1'           Literal.Number.Integer
+')'           Punctuation
+':'           Operator
+'UInt'        Keyword.Type
+'('           Punctuation
+'2'           Literal.Number.Integer
+')'           Punctuation
+'\n'          Text
diff --git a/tests/snippets/julia/test_types.txt b/tests/snippets/julia/test_types.txt
new file mode 100644
index 00000000..dc475349
--- /dev/null
+++ b/tests/snippets/julia/test_types.txt
@@ -0,0 +1,196 @@
+# Tests identifying names which must be types from context
+
+---input---
+Union{}
+MyType{Nothing, Any}
+f(::Union{T,S}) where S where T = 1
+f(::T) where {T} = 1
+f(::Type{<:T}) = 1
+f(::AT) where AT <: AbstractArray{MyType,1} = 1
+f(::Val{:named}) = 1
+f(::typeof(sin)) = 1
+MyInt <: Integer
+Number >: MyInt
+AT{T,1} <: B
+B>:AT{T,1}
+A <: f(B)
+g(C) <: T
+
+---tokens---
+'Union'       Keyword.Type
+'{'           Punctuation
+'}'           Punctuation
+'\n'          Text
+
+'MyType'      Keyword.Type
+'{'           Punctuation
+'Nothing'     Keyword.Type
+','           Punctuation
+' '           Text
+'Any'         Keyword.Type
+'}'           Punctuation
+'\n'          Text
+
+'f'           Name
+'('           Punctuation
+'::'          Operator
+'Union'       Keyword.Type
+'{'           Punctuation
+'T'           Keyword.Type
+','           Punctuation
+'S'           Keyword.Type
+'}'           Punctuation
+')'           Punctuation
+' '           Text
+'where'       Keyword
+' '           Text
+'S'           Keyword.Type
+' '           Text
+'where'       Keyword
+' '           Text
+'T'           Keyword.Type
+' '           Text
+'='           Operator
+' '           Text
+'1'           Literal.Number.Integer
+'\n'          Text
+
+'f'           Name
+'('           Punctuation
+'::'          Operator
+'T'           Keyword.Type
+')'           Punctuation
+' '           Text
+'where'       Keyword
+' '           Text
+'{'           Punctuation
+'T'           Keyword.Type
+'}'           Punctuation
+' '           Text
+'='           Operator
+' '           Text
+'1'           Literal.Number.Integer
+'\n'          Text
+
+'f'           Name
+'('           Punctuation
+'::'          Operator
+'Type'        Keyword.Type
+'{'           Punctuation
+'<:'          Operator
+'T'           Keyword.Type
+'}'           Punctuation
+')'           Punctuation
+' '           Text
+'='           Operator
+' '           Text
+'1'           Literal.Number.Integer
+'\n'          Text
+
+'f'           Name
+'('           Punctuation
+'::'          Operator
+'AT'          Keyword.Type
+')'           Punctuation
+' '           Text
+'where'       Keyword
+' '           Text
+'AT'          Keyword.Type
+' '           Text
+'<:'          Operator
+' '           Text
+'AbstractArray' Keyword.Type
+'{'           Punctuation
+'MyType'      Keyword.Type
+','           Punctuation
+'1'           Literal.Number.Integer
+'}'           Punctuation
+' '           Text
+'='           Operator
+' '           Text
+'1'           Literal.Number.Integer
+'\n'          Text
+
+'f'           Name
+'('           Punctuation
+'::'          Operator
+'Val'         Keyword.Type
+'{'           Punctuation
+':named'      Literal.String.Symbol
+'}'           Punctuation
+')'           Punctuation
+' '           Text
+'='           Operator
+' '           Text
+'1'           Literal.Number.Integer
+'\n'          Text
+
+'f'           Name
+'('           Punctuation
+'::'          Operator
+'typeof'      Name
+'('           Punctuation
+'sin'         Name
+')'           Punctuation
+')'           Punctuation
+' '           Text
+'='           Operator
+' '           Text
+'1'           Literal.Number.Integer
+'\n'          Text
+
+'MyInt'       Keyword.Type
+' '           Text
+'<:'          Operator
+' '           Text
+'Integer'     Keyword.Type
+'\n'          Text
+
+'Number'      Keyword.Type
+' '           Text
+'>:'          Operator
+' '           Text
+'MyInt'       Keyword.Type
+'\n'          Text
+
+'AT'          Keyword.Type
+'{'           Punctuation
+'T'           Keyword.Type
+','           Punctuation
+'1'           Literal.Number.Integer
+'}'           Punctuation
+' '           Text
+'<:'          Operator
+' '           Text
+'B'           Keyword.Type
+'\n'          Text
+
+'B'           Keyword.Type
+'>:'          Operator
+'AT'          Keyword.Type
+'{'           Punctuation
+'T'           Keyword.Type
+','           Punctuation
+'1'           Literal.Number.Integer
+'}'           Punctuation
+'\n'          Text
+
+'A'           Keyword.Type
+' '           Text
+'<:'          Operator
+' '           Text
+'f'           Name
+'('           Punctuation
+'B'           Name
+')'           Punctuation
+'\n'          Text
+
+'g'           Name
+'('           Punctuation
+'C'           Name
+')'           Punctuation
+' '           Text
+'<:'          Operator
+' '           Text
+'T'           Keyword.Type
+'\n'          Text