1 files changed, 71 insertions, 0 deletions
diff --git a/server/src/core/hover_function.lua b/server/src/core/hover_function.lua
new file mode 100644
index 00000000..08581a3e
--- /dev/null
+++ b/server/src/core/hover_function.lua
@@ -0,0 +1,71 @@
+local function buildValueArgs(func, source, select)
+    local names = {}
+    local values = {}
+    if func.args then
+        for i, arg in ipairs(func.args) do
+            names[i] = arg.key
+        end
+    end
+    if func.argValues then
+        for i, value in ipairs(func.argValues) do
+            values[i] = value.type
+        end
+    end
+    local strs = {}
+    local argLabel
+    local start = 1
+    if source.object then
+        start = 2
+        if select then
+            select = select + 1
+        end
+    end
+    local max
+    if func.built then
+        max = #names
+    else
+        max = math.max(#names, #values)
+    end
+    for i = start, max do
+        local name = names[i]
+        local value = values[i] or 'any'
+        if name then
+            strs[#strs+1] = name .. ': ' .. value
+        else
+            strs[#strs+1] = value
+        end
+        if i == select then
+            argLabel = strs[#strs]
+        end
+    end
+    if func.hasDots then
+        strs[#strs+1] = '...'
+    end
+    return table.concat(strs, ', '), argLabel
+end
+
+local function buildValueReturns(func)
+    if not func.hasReturn then
+        return ''
+    end
+    local strs = {}
+    if func.returns then
+        for i, rtn in ipairs(func.returns) do
+            strs[i] = rtn.type
+        end
+    end
+    if #strs == 0 then
+        strs[1] = 'any'
+    end
+    return '\n  -> ' .. table.concat(strs, ', ')
+end
+
+return function (name, func, source, select)
+    local args, argLabel = buildValueArgs(func, source, select)
+    local returns = buildValueReturns(func)
+    local title = ('function %s(%s)%s'):format(name, args, returns)
+    return {
+        label = title,
+        argLabel = argLabel,
+    }
+end