dotfiles from arch

nvim/mason/packages/lua-language-server/libexec/script/vm/def.lua

@@ -0,0 +1,133 @@
+---@class vm
+local vm        = require 'vm.vm'
+local util      = require 'utility'
+local guide     = require 'parser.guide'
+
+local simpleSwitch
+
+simpleSwitch = util.switch()
+    : case 'goto'
+    : call(function (source, pushResult)
+        if source.node then
+            pushResult(source.node)
+        end
+    end)
+    : case 'doc.cast.name'
+    : call(function (source, pushResult)
+        local loc = guide.getLocal(source, source[1], source.start)
+        if loc then
+            pushResult(loc)
+        end
+    end)
+    : case 'doc.field'
+    : call(function (source, pushResult)
+        pushResult(source)
+    end)
+
+---@param source  parser.object
+---@param pushResult fun(src: parser.object)
+local function searchBySimple(source, pushResult)
+    simpleSwitch(source.type, source, pushResult)
+end
+
+---@param source  parser.object
+---@param pushResult fun(src: parser.object)
+local function searchByLocalID(source, pushResult)
+    local idSources = vm.getVariableSets(source)
+    if not idSources then
+        return
+    end
+    for _, src in ipairs(idSources) do
+        pushResult(src)
+    end
+end
+
+local function searchByNode(source, pushResult)
+    local node = vm.compileNode(source)
+    local suri = guide.getUri(source)
+    for n in node:eachObject() do
+        if n.type == 'global' then
+            for _, set in ipairs(n:getSets(suri)) do
+                pushResult(set)
+            end
+        else
+            pushResult(n)
+        end
+    end
+end
+
+---@param source parser.object
+---@return       parser.object[]
+function vm.getDefs(source)
+    local results = {}
+    local mark    = {}
+
+    local hasLocal
+    local function pushResult(src)
+        if src.type == 'local' then
+            if hasLocal then
+                return
+            end
+            hasLocal = true
+            if  source.type ~= 'local'
+            and source.type ~= 'getlocal'
+            and source.type ~= 'setlocal'
+            and source.type ~= 'doc.cast.name' then
+                return
+            end
+        end
+        if not mark[src] then
+            mark[src] = true
+            if guide.isAssign(src)
+            or guide.isLiteral(src) then
+                results[#results+1] = src
+            end
+        end
+    end
+
+    searchBySimple(source, pushResult)
+    searchByLocalID(source, pushResult)
+    vm.compileByNodeChain(source, pushResult)
+    searchByNode(source, pushResult)
+
+    return results
+end
+
+local HAS_DEF_ERR = false  -- the error object for comparing
+local function checkHasDef(checkFunc, source, pushResult)
+    local _, err = pcall(checkFunc, source, pushResult)
+    return err == HAS_DEF_ERR
+end
+
+---@param source parser.object
+function vm.hasDef(source)
+    local mark = {}
+    local hasLocal
+    local function pushResult(src)
+        if src.type == 'local' then
+            if hasLocal then
+                return
+            end
+            hasLocal = true
+            if  source.type ~= 'local'
+            and source.type ~= 'getlocal'
+            and source.type ~= 'setlocal'
+            and source.type ~= 'doc.cast.name' then
+                return
+            end
+        end
+        if not mark[src] then
+            mark[src] = true
+            if guide.isAssign(src)
+            or guide.isLiteral(src) then
+                -- break out on 1st result using error() with a unique error object
+                error(HAS_DEF_ERR)
+            end
+        end
+    end
+
+    return checkHasDef(searchBySimple, source, pushResult)
+        or checkHasDef(searchByLocalID, source, pushResult)
+        or checkHasDef(vm.compileByNodeChain, source, pushResult)
+        or checkHasDef(searchByNode, source, pushResult)
+end