---@class vm
local vm       = require 'vm.vm'
local util     = require 'utility'
local compiler = require 'vm.node.compiler'
local guide    = require 'parser.guide'

local simpleMap = util.switch()
    : case 'local'
    : call(function (source, results)
        results[#results+1] = source
    end)
    : case 'getlocal'
    : case 'setlocal'
    : call(function (source, results)
        results[#results+1] = source.node
    end)
    : getMap()

local noderMap = util.switch()
    : case 'global'
    ---@param node vm.node.global
    : call(function (node, results)
        for _, set in ipairs(node:getSets()) do
            results[#results+1] = set
        end
    end)
    : getMap()

function vm.getDefs(source, field)
    local results = {}

    -- search by simple
    local simple  = simpleMap[source.type]
    if simple then
        simple(source, results)
    end
    local uri   = guide.getUri(source)

    -- search by node
    local node  = compiler.compileNode(uri, source)
    local noder = noderMap[node.type]
    if noder then
        noder(node, results)
    end

    return results
end

function vm.getAllDefs(source, field)
    return vm.getDefs(source, field)
end