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path: root/server-beta/src/core/diagnostics/duplicate-index.lua
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local files   = require 'files'
local guide   = require 'parser.guide'
local lang    = require 'language'
local define  = require 'proto.define'

return function (uri, callback)
    local ast = files.getAst(uri)
    if not ast then
        return
    end

    local mark = {}
    guide.eachSourceType(ast.ast, 'table', function (source)
        for _, obj in ipairs(source) do
            if obj.type == 'tablefield'
            or obj.type == 'tableindex' then
                local name = guide.getKeyName(obj)
                if name then
                    if not mark[name] then
                        mark[name] = {}
                    end
                    mark[name][#mark[name]+1] = obj.field or obj.index
                end
            end
        end
    end)

    for name, defs in pairs(mark) do
        local sname = name:match '^.|(.+)$'
        if #defs > 1 and sname then
            local related = {}
            for i = 1, #defs do
                local def = defs[i]
                related[i] = {
                    start  = def.start,
                    finish = def.finish,
                    uri    = uri,
                }
            end
            for i = 1, #defs - 1 do
                local def = defs[i]
                callback {
                    start   = def.start,
                    finish  = def.finish,
                    related = related,
                    message = lang.script('DIAG_DUPLICATE_INDEX', sname),
                    level   = define.DiagnosticSeverity.Hint,
                    tags    = { define.DiagnosticTag.Unnecessary },
                }
            end
            for i = #defs, #defs do
                local def = defs[i]
                callback {
                    start   = def.start,
                    finish  = def.finish,
                    related = related,
                    message = lang.script('DIAG_DUPLICATE_INDEX', sname),
                }
            end
        end
    end
end