【高级技巧】递归下降的JSON解析简化版：三层文法手写实现

local function skipSpace(s, i)
    while i <= #s do
        local c = string.sub(s, i, i)
        if c == " " or c == "\n" or c == "\t" or c == "#" then
            local nl = string.find(s, "\n", i, true)
            if c == "#" and nl then
                i = nl + 1
            else
                i = i + 1
            end
        else
            break
        end
    end
    return i
end
local function parseValue(s, i)
    i = skipSpace(s, i)
    local c = string.sub(s, i, i)
    if c == "{" then
        local obj = {}
        i = i + 1
        while true do
            i = skipSpace(s, i)
            if string.sub(s, i, i) == "}" then
                return obj, i + 1
            end
            local k, j = string.match(string.sub(s, i), '"([^"]+)"%s*:')
            local v, i2 = parseValue(s, i + #k + 4)
            obj[k] = v
            i = i2
            i = skipSpace(s, i)
            if string.sub(s, i, i) == "," then
                i = i + 1
            end
        end
    end
    local num = tonumber(string.match(string.sub(s, i), "^-?%d+%.?%d*"))
    return num, i + #tostring(num)
end

local cfg, _ = parseValue('{ "boss": "祖玛教主", "hp": 320000, }', 1)
sendmsg(nil, 1, cfg.boss .. " 血量 " .. cfg.hp)