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path: root/script/method/textDocument/completion.lua
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local core = require 'core'
local parser = require 'parser'

local function posToRange(lines, start, finish)
    local start_row,  start_col  = lines:rowcol(start)
    local finish_row, finish_col = lines:rowcol(finish)
    return {
        start = {
            line = start_row - 1,
            character = start_col - 1,
        },
        ['end'] = {
            line = finish_row - 1,
            character = finish_col,
        },
    }
end

local function fastCompletion(lsp, params, lines)
    local uri = params.textDocument.uri
    local text, oldText = lsp:getText(uri)
    -- lua是从1开始的,因此都要+1
    local position = lines:positionAsChar(params.position.line + 1, params.position.character)

    local vm = lsp:getVM(uri)
    if not vm then
        vm = lsp:loadVM(uri)
        if not vm then
            return nil
        end
    end

    local items = core.completion(vm, text, position, oldText)
    if not items or #items == 0 then
        vm = lsp:loadVM(uri)
        if not vm then
            return nil
        end
        items = core.completion(vm, text, position)
        if not items or #items == 0 then
            return nil
        end
    end

    return items
end

local function finishCompletion(lsp, params, lines)
    local uri = params.textDocument.uri
    local text = lsp:getText(uri)
    -- lua是从1开始的,因此都要+1
    local position = lines:positionAsChar(params.position.line + 1, params.position.character)

    local vm = lsp:loadVM(uri)
    if not vm then
        return nil
    end

    local items = core.completion(vm, text, position)
    if not items or #items == 0 then
        return nil
    end

    return items
end

return function (lsp, params)
    local uri = params.textDocument.uri
    local text, oldText = lsp:getText(uri)
    if not text then
        return nil
    end

    local lines = parser:lines(text, 'utf8')
    local items = fastCompletion(lsp, params, lines)
    --local items = finishCompletion(lsp, params, lines)
    if not items then
        return nil
    end

    for i, item in ipairs(items) do
        item.sortText = ('%04d'):format(i)
        item.insertTextFormat = 2
        item.insertText = item.insertText or item.label
        if item.textEdit then
            item.textEdit.range = posToRange(lines, item.textEdit.start, item.textEdit.finish)
            item.textEdit.start = nil
            item.textEdit.finish = nil
        end
        if item.additionalTextEdits then
            for _, textEdit in ipairs(item.additionalTextEdits) do
                textEdit.range = posToRange(lines, textEdit.start, textEdit.finish)
                textEdit.start = nil
                textEdit.finish = nil
            end
        end
    end

    local response = {
        isIncomplete = true,
        items = items,
    }
    return response
end