add unicode completions by latex name

src/LanguageServer.jl

@@ -34,6 +34,7 @@ include("requests/textdocument.jl")
 include("requests/features.jl")
 include("requests/hover.jl")
 include("requests/completions.jl")
+include("requests/completions_latex.jl")
 include("requests/workspace.jl")
 include("requests/actions.jl")
 include("requests/init.jl")

src/requests/completions.jl

@@ -257,14 +257,26 @@
 function collect_completions(x::StaticLint.Scope, spartial, state::CompletionState, inclexported=false, dotcomps=false)
     if x.names !== nothing
         possible_names = String[]
+        possible_unicode_altnames = Tuple{String,String}[]
         for n in x.names
+
             resize!(possible_names, 0)
+            resize!(possible_unicode_altnames, 0)
+
+            # name, binding = n[1], n[2] # name and binding
+
             if is_completion_match(n[1], spartial) && n[1] != spartial
                 push!(possible_names, n[1])
             end
+
             if (nn = string_macro_altname(n[1]); nn !== nothing) && is_completion_match(nn, spartial)
                 push!(possible_names, nn)
             end
+
+            if (nn = latex_symbol_altname(n[1]); nn !== nothing) && is_completion_match(nn, spartial)
+                push!(possible_unicode_altnames, (n[1], nn)) # store unicode and alt name, e.g. (α, alpha)
+            end
+
             if length(possible_names) > 0
                 documentation = ""
                 if n[2] isa StaticLint.Binding
@@ -275,6 +287,31 @@
                     add_completion_item(state, CompletionItem(nn, _completion_kind(n[2]), get_typed_definition(n[2]), MarkupContent(documentation), texteditfor(state, spartial, nn)))
                 end
             end
+
+
+            # If we have a unicode altname, add the completion item
+            if length(possible_unicode_altnames) > 0
+                documentation = ""
+                if n[2] isa StaticLint.Binding
+                    documentation = get_tooltip(n[2], documentation, state.server)
+                    sanitize_docstring(documentation)
+                end
+                for (n_orig, nn) in possible_unicode_altnames
+                    # Define the label text that is shown in the completion list in the editor
+                    # TODO Find out why the typed name (e.g. "alpha") has to be shown in the compltion list instead of just the unicode symbol
+                    label_ext = nn * " (" * n_orig * ")" # e.g. "alpha (α)" 
+                    add_completion_item(
+                        state,
+                        CompletionItem(
+                            label_ext,
+                            _completion_kind(n[2]),
+                            get_typed_definition(n[2]),
+                            MarkupContent(documentation),
+                            texteditfor(state, spartial, n[1])
+                        )
+                    )
+                end
+            end
         end
     end
 end

src/requests/completions_latex.jl

@@ -0,0 +1,98 @@
+
+
+# TODO Complete, only a subset for now
+latex_inverse_mappings = Dict{Char,String}(
+# Greek    
+    'Α' => "Alpha",
+    'Β' => "Beta",
+    'Γ' => "Gamma",
+    'Δ' => "Delta",
+    'Ε' => "Epsilon",
+    'Ζ' => "Zeta",
+    'Η' => "Eta",
+    'Θ' => "Theta",
+    'Ι' => "Iota",
+    'Κ' => "Kappa",
+    'Λ' => "Lambda",
+    'Ξ' => "Xi",
+    'Π' => "Pi",
+    'Ρ' => "Rho",
+    'Σ' => "Sigma",
+    'Τ' => "Tau",
+    'Υ' => "Upsilon",
+    'Φ' => "Phi",
+    'Χ' => "Chi",
+    'Ψ' => "Psi",
+    'Ω' => "Omega",
+    'α' => "alpha",
+    'β' => "beta",
+    'γ' => "gamma",
+    'δ' => "delta",
+    'ζ' => "zeta",
+    'η' => "eta",
+    'θ' => "theta",
+    'ι' => "iota",
+    'κ' => "kappa",
+    'λ' => "lambda",
+    'μ' => "mu",
+    'ν' => "nu",
+    'ξ' => "xi",
+    'π' => "pi",
+    'ρ' => "rho",
+    'ς' => "varsigma",
+    'σ' => "sigma",
+    'τ' => "tau",
+    'υ' => "upsilon",
+    'φ' => "varphi",
+    'χ' => "chi",
+    'ψ' => "psi",
+    'ω' => "omega",
+    'ϑ' => "vartheta",
+    'ϕ' => "phi",
+    'ϖ' => "varpi",
+    'Ϛ' => "Stigma",
+    'Ϝ' => "Digamma",
+    'ϝ' => "digamma",
+    'Ϟ' => "Koppa",
+    'Ϡ' => "Sampi",
+    'ϰ' => "varkappa",
+    'ϱ' => "varrho",
+    'ϴ' => "varTheta",
+    'ϵ' => "epsilon",
+    '϶' => "backepsilon",
+
+    # Indices
+    '₀' => "_0",
+    '₁' => "_1",
+    '₂' => "_2",
+    '₃' => "_3",
+    '₄' => "_4",
+    '₅' => "_5",
+    '₆' => "_6",
+    '₇' => "_7",
+    '₈' => "_8",
+    '₉' => "_9",
+)
+
+"""
+    latex_symbol_altname(s)
+
+If the string `s` contains latex unicode symbols, return the string with the symbols replaced by their corresponding latex commands. 
+If there are no latex symbols in `s`, return `nothing`.
+"""
+function latex_symbol_altname(s)
+
+    parts = map(eachindex(s)) do i
+        c = s[i]
+        if !isascii(c) && c ∈ keys(latex_inverse_mappings)
+            return latex_inverse_mappings[c]
+        else
+            return string(c) # needed for typestability
+        end
+    end
+
+    # If the number of codeunits is the same as the number of parts, then there are no latex symbols
+    ncodeunits(s) === length(parts) && return nothing
+
+    return join(parts)
+end

test/test_completions.jl

@@ -0,0 +1,12 @@
+@testitem "Completions" begin
+    import LanguageServer
+
+
+    # Test Unicode Altname completion
+    s = ["α", "decay_β", "θ₀", "x₀", "y", "z"]
+    s_exp = ["alpha", "decay_beta", "theta_0", "x_0", nothing, nothing]
+    for (i, (s, s_exp)) in enumerate(zip(s, s_exp))
+        @test LanguageServer.latex_symbol_altname(s) == s_exp
+    end
+
+end