-- This code is derived from the SOM benchmarks, see AUTHORS.md file.
--
-- Copyright (c) 2016 Francois Perrad <francois.perrad@gadz.org>
--
-- Permission is hereby granted, free of charge, to any person obtaining a copy
-- of this software and associated documentation files (the 'Software'), to deal
-- in the Software without restriction, including without limitation the rights
-- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-- copies of the Software, and to permit persons to whom the Software is
-- furnished to do so, subject to the following conditions:
--
-- The above copyright notice and this permission notice shall be included in
-- all copies or substantial portions of the Software.
--
-- THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-- THE SOFTWARE.

--[[
    The module 'bit' is available with:
      * LuaJIT
      * LuaBitOp extension which is available for:
          * Lua 5.1
          * Lua 5.2
    The module 'bit32' is available with:
      * Lua 5.2
      * Lua 5.3 when compiled with LUA_COMPAT_5_2
    The bitwise operators are added to Lua 5.3 as new lexemes (there causes
    lexical error in older version)
--]]
local band, bxor, rshift
if _VERSION < 'Lua 5.3' then
    local bit = bit32 or require'bit'
    band = bit.band
    bxor = bit.bxor
    rshift = bit.rshift
else
    band = assert(load'--[[band]] return function (a, b) return a & b end')()
    bxor = assert(load'--[[bxor]] return function (a, b) return a ~ b end')()
    rshift = assert(load'--[[rshift]] return function (a, b) return a >> b end')()
end

local alloc_array
local ok, table_new = pcall(require, 'table.new')       -- LuaJIT 2.1 extension
if ok then
    alloc_array = function (n)
        local t = table_new(n, 1)
        t.n = n
        return t
    end
else
    alloc_array = function (n)
        local t = {}
        t.n = n
        return t
    end
end

local Vector = {_CLASS = 'Vector'} do

local floor = math.floor

function Vector.new (size)
    local obj = {
        storage   = alloc_array(size or 50),
        first_idx = 1,
        last_idx  = 1,
    }
    return setmetatable(obj, {__index = Vector})
end

function Vector.with (elem)
    local v = Vector.new(1)
    v:append(elem)
    return v
end

function Vector:at (idx)
    if idx > self.storage.n then
        return nil
    end
    return self.storage[idx]
end

function Vector:at_put (idx, val)
    if idx > self.storage.n then
        local new_n = self.storage.n
        while idx > new_n do
            new_n = new_n * 2
        end

        local new_storage = alloc_array(new_n)
        for i = 1, self.storage.n do
            new_storage[i] = self.storage[i]
        end
        self.storage = new_storage
    end
    self.storage[idx] = val

    if self.last_idx < idx + 1 then
        self.last_idx = idx + 1
    end
end

function Vector:append (elem)
    if self.last_idx > self.storage.n then
        -- Need to expand capacity first
        local new_storage = alloc_array(2 * self.storage.n)
        for i = 1, self.storage.n do
            new_storage[i] = self.storage[i]
        end
        self.storage = new_storage
    end

    self.storage[self.last_idx] = elem
    self.last_idx = self.last_idx + 1
end

function Vector:is_empty ()
    return self.last_idx == self.first_idx
end

function Vector:each (fn)
    for i = self.first_idx, self.last_idx - 1 do
        fn(self.storage[i])
    end
end

function Vector:has_some (fn)
    for i = self.first_idx, self.last_idx - 1 do
        if fn(self.storage[i]) then
            return true
        end
    end
    return false
end

function Vector:get_one (fn)
    for i = self.first_idx, self.last_idx - 1 do
        local e = self.storage[i]
        if fn(e) then
            return e
        end
    end
    return nil
end

function Vector:remove_first ()
    if self:is_empty() then
        return nil
    end

    self.first_idx = self.first_idx + 1
    return self.storage[self.first_idx - 1]
end

function Vector:remove (obj)
    local new_array = alloc_array(self:capacity())
    local new_last = 1
    local found = false

    self:each(function (it)
        if it == obj then
            found = true
        else
            new_array[new_last] = it
            new_last = new_last + 1
        end
    end)

    self.storage   = new_array
    self.last_idx  = new_last
    self.first_idx = 1
    return found
end

function Vector:remove_all ()
    self.first_idx = 1
    self.last_idx = 1
    self.storage = alloc_array(self:capacity())
end

function Vector:size ()
    return self.last_idx - self.first_idx
end

function Vector:capacity ()
    return self.storage.n
end

function Vector:sort (fn)
    -- Make the argument, block, be the criterion for ordering elements of
    -- the receiver.
    -- Sort blocks with side effects may not work right.
    if self:size() > 0 then
        self:sort_range(self.first_idx, self.last_idx - 1, fn)
    end
end

function Vector:sort_range (i, j, fn)
    assert(fn)

    -- The prefix d means the data at that index.
    local n = j + 1 - i
    if n <= 1 then
        -- Nothing to sort
        return
    end

    local storage = self.storage
    -- Sort di, dj
    local di = storage[i]
    local dj = storage[j]

    -- i.e., should di precede dj?
    if not fn(di, dj) then
        local tmp = storage[i]
        storage[i] = storage[j]
        storage[j] = tmp
        local tt = di
        di = dj
        dj = tt
    end

    -- NOTE: For DeltaBlue, this is never reached.
    if n > 2 then               -- More than two elements.
        local ij  = floor((i + j) / 2)  -- ij is the midpoint of i and j.
        local dij = storage[ij]         -- Sort di,dij,dj.  Make dij be their median.

        if fn(di, dij) then             -- i.e. should di precede dij?
            if not fn(dij, dj) then     -- i.e., should dij precede dj?
               local tmp = storage[j]
               storage[j] = storage[ij]
               storage[ij] = tmp
               dij = dj
            end
        else                            -- i.e. di should come after dij
            local tmp = storage[i]
            storage[i] = storage[ij]
            storage[ij] = tmp
            dij = di
        end

        if n > 3 then           -- More than three elements.
            -- Find k>i and l<j such that dk,dij,dl are in reverse order.
            -- Swap k and l.  Repeat this procedure until k and l pass each other.
            local k = i
            local l = j - 1

            while true do
                -- i.e. while dl succeeds dij
                while k <= l and fn(dij, storage[l]) do
                    l = l - 1
                end

                k = k + 1
                -- i.e. while dij succeeds dk
                while k <= l and fn(storage[k], dij) do
                    k = k + 1
                end

                if k > l then
                    break
                end

                local tmp = storage[k]
                storage[k] = storage[l]
                storage[l] = tmp
            end

            -- Now l < k (either 1 or 2 less), and di through dl are all
            -- less than or equal to dk through dj.  Sort those two segments.
            self:sort_range(i, l, fn)
            self:sort_range(k, j, fn)
        end
    end
end

end -- class Vector

local Set = {_CLASS = 'Set'} do

local INITIAL_SIZE = 10

function Set.new (size)
    local obj = {
        items = Vector.new(size or INITIAL_SIZE)
    }
    return setmetatable(obj, {__index = Set})
end

function Set:size ()
    return self.items:size()
end

function Set:each (fn)
    self.items:each(fn)
end

function Set:has_some (fn)
    return self.items:has_some(fn)
end

function Set:get_one (fn)
    return self.items:get_one(fn)
end

function Set:add (obj)
    if not self:contains(obj) then
        self.items:append(obj)
    end
end

function Set:remove_all ()
    self.items:remove_all()
end

function Set:collect (fn)
    local coll = Vector.new()
    self:each(function (it)
        coll:append(fn(it))
    end)
    return coll
end

function Set:contains (obj)
    return self:has_some(function (it) return it == obj end)
end

end -- class Set

local IdentitySet = {_CLASS = 'IdentitySet'} do
setmetatable(IdentitySet, {__index = Set})

function IdentitySet.new (size)
    local obj = Set.new(size)
    return setmetatable(obj, {__index = IdentitySet})
end

function IdentitySet:contains (obj)
    return self:has_some(function (it) return it == obj end)
end

end -- class IdentitySet

local Entry = {_CLASS = 'Entry'} do

function Entry.new (hash, key, value, next)
    local obj = {
        hash  = hash,
        key   = key,
        value = value,
        next  = next,
    }
    return setmetatable(obj, {__index = Entry})
end

function Entry:match (hash, key)
    return self.hash == hash and self.key == key
end

end -- class Entry

local Dictionary = {_CLASS = 'Dictionary'} do

local INITIAL_CAPACITY = 16

function Dictionary.new (size)
    local obj = {
        buckets = alloc_array(size or INITIAL_CAPACITY),
        size    = 0,
    }
    return setmetatable(obj, {__index = Dictionary})
end

function Dictionary:hash (key)
    if not key then
        return 0
    end
    local hash = key:custom_hash()
    return bxor(hash, rshift(hash, 16))
end

function Dictionary:is_empty ()
    return self.size == 0
end

function Dictionary:get_bucket_idx (hash)
    return band(self.buckets.n - 1, hash) + 1
end

function Dictionary:get_bucket (hash)
    return self.buckets[self:get_bucket_idx(hash)]
end

function Dictionary:at (key)
    local hash = self:hash(key)
    local e = self:get_bucket(hash)

    while e do
        if e:match(hash, key) then
            return e.value
        end
        e = e.next
    end
    return nil
end

function Dictionary:contains_key (key)
    local hash = self:hash(key)
    local e = self:get_bucket(hash)

    while e do
        if e.match(hash, key) then
            return true
        end
        e = e.next
    end
    return false
end

function Dictionary:at_put (key, value)
    local hash = self:hash(key)
    local i = self:get_bucket_idx(hash)
    local current = self.buckets[i]

    if not current then
        self.buckets[i] = self:new_entry(key, value, hash)
        self.size = self.size + 1
    else
        self:insert_bucket_entry(key, value, hash, current)
    end

    if self.size > self.buckets.n then
        self:resize()
    end
end

function Dictionary:new_entry (key, value, hash)
    return Entry.new(hash, key, value, nil)
end

function Dictionary:insert_bucket_entry (key, value, hash, head)
    local current = head

    while true do
        if current:match(hash, key) then
            current.value = value
            return
        end
        if not current.next then
            self.size = self.size + 1
            current.next = self:new_entry(key, value, hash)
            return
        end
        current = current.next
    end
end

function Dictionary:resize ()
    local old_storage = self.buckets
    self.buckets = alloc_array(old_storage.n * 2)
    self:transfer_entries(old_storage)
end

function Dictionary:transfer_entries (old_storage)
    local buckets = self.buckets
    for i = 1, old_storage.n do
        local current = old_storage[i]

        if current then
            old_storage[i] = nil
            if not current.next then
                local hash = band(current.hash, buckets.n - 1) + 1
                buckets[hash] = current
            else
                self:split_bucket(old_storage, i, current)
            end
        end
    end
end

function Dictionary:split_bucket (old_storage, i, head)
    local lo_head, lo_tail = nil, nil
    local hi_head, hi_tail = nil, nil
    local current = head

    while current do
        if band(current.hash, old_storage.n) == 0 then
            if not lo_tail then
               lo_head = current
            else
                lo_tail.next = current
            end
            lo_tail = current
        else
            if not hi_tail then
                hi_head = current
            else
                hi_tail.next = current
            end
            hi_tail = current
        end
       current = current.next
    end

    if lo_tail then
        lo_tail.next = nil
        self.buckets[i] = lo_head
    end
    if hi_tail then
        hi_tail.next = nil
        self.buckets[i + old_storage.n] = hi_head
    end
end

function Dictionary:remove_all ()
    self.buckets = alloc_array(self.buckets.n)
    self.size = 0
end

function Dictionary:keys ()
    local keys = Vector.new(self.size)
    local buckets = self.buckets
    for i = 1, buckets.n do
        local current = buckets[i]
        while current do
            keys:append(current.key)
            current = current.next
        end
    end
    return keys
end

function Dictionary:values ()
    local vals = Vector.new(self.size)
    local buckets = self.buckets
    for i = 1, buckets.n do
        local current = buckets[i]
        while current do
            vals:append(current.value)
            current = current.next
        end
    end
    return vals
end

end -- class Dictionary

local IdEntry = {_CLASS = 'IdEntry'} do
setmetatable(IdEntry, {__index = Entry})

function IdEntry.new (hash, key, value, next)
    local obj = Entry.new (hash, key, value, next)
    return setmetatable(obj, {__index = IdEntry})
end

function IdEntry:match (hash, key)
    return self.hash == hash and self.key == key
end

end -- class IdEntry

local IdentityDictionary = {_CLASS = 'IdentityDictionary'} do
setmetatable(IdentityDictionary, {__index = Dictionary})

function IdentityDictionary.new (size)
    local obj = Dictionary.new (size)
    return setmetatable(obj, {__index = Dictionary})
end

function IdentityDictionary:new_entry (key, value, hash)
    return IdEntry.new(hash, key, value, nil)
end

end -- class IdentityDictionary

local Random = {_CLASS = 'Random'} do

function Random.new ()
    local obj = {seed = 74755}
    return setmetatable(obj, {__index = Random})
end

function Random:next ()
  self.seed = band(((self.seed * 1309) + 13849), 65535);
  return self.seed;
end

end -- class Random

---------------------------------

local benchmark = {} do

function benchmark:inner_benchmark_loop (inner_iterations)
    for _ = 1, inner_iterations do
        if not self:verify_result(self:benchmark()) then
            return false
        end
    end
    return true
end

function benchmark:benchmark ()
    error 'subclass_responsibility'
end

function benchmark:verify_result ()
    error 'subclass_responsibility'
end

end

---------------------------------

local JsonValue = {_CLASS = 'JsonValue'} do

function JsonValue:is_object ()
    return false
end

function JsonValue:is_array ()
    return false
end

function JsonValue:is_number ()
    return false
end

function JsonValue:is_string ()
    return false
end

function JsonValue:is_boolean ()
    return false
end

function JsonValue:is_true ()
    return false
end

function JsonValue:is_false ()
    return false
end

function JsonValue:is_null ()
    return false
end

function JsonValue:as_object ()
    error('Unsupported operation, not an object: ' .. self:as_string())
end

function JsonValue:as_array ()
    error('Unsupported operation, not an array: ' .. self:as_string())
end

end -- abstract JsonValue

local JsonArray = {_CLASS = 'JsonArray'} do
setmetatable(JsonArray, {__index = JsonValue})

function JsonArray.new ()
    local obj = {values = Vector.new()}
    return setmetatable(obj, {__index = JsonArray})
end

function JsonArray:add (value)
    assert(value, 'value is null')
    self.values:append(value)
    return self
end

function JsonArray:size ()
    return self.values:size()
end

function JsonArray:get (index)
    return self.values:at(index)
end

function JsonArray:is_array ()
    return true
end

function JsonArray:as_array ()
    return self
end

end -- class JsonArray

local JsonLiteral = {_CLASS = 'JsonLiteral'} do
setmetatable(JsonLiteral, {__index = JsonValue})

function JsonLiteral.new (value)
    local obj = {
        value    = value,
        is_null  = 'null'  == value,
        is_true  = 'true'  == value,
        is_false = 'false' == value,
    }
    return setmetatable(obj, {__index = JsonLiteral})
end

function JsonLiteral:as_string ()
    return self.value
end

function JsonLiteral:is_boolean ()
    return self.is_true or self.is_false
end

JsonLiteral.NULL  = JsonLiteral.new('null')
JsonLiteral.TRUE  = JsonLiteral.new('true')
JsonLiteral.FALSE = JsonLiteral.new('false')

end -- class JsonLiteral

local JsonNumber = {_CLASS = 'JsonNumber'} do
setmetatable(JsonNumber, {__index = JsonValue})

function JsonNumber.new (string)
    assert(string, 'string is null')
    local obj = {string = string}
    return setmetatable(obj, {__index = JsonNumber})
end

function JsonNumber:as_string ()
    return self.string
end

function JsonNumber:is_number ()
    return true
end

end -- class JsonNumber

local JsonString = {_CLASS = 'JsonString'} do
setmetatable(JsonString, {__index = JsonValue})

function JsonString.new (string)
    assert(string, 'string is null')
    local obj = {string = string}
    return setmetatable(obj, {__index = JsonString})
end

function JsonString:is_string ()
    return true
end

function JsonString:as_string ()
    return self.string
end

end -- class JsonString

---------------

local HashIndexTable = {_CLASS = 'HashIndexTable'} do

function HashIndexTable.new ()
    local obj = {
        hash_table = {length = 32;
                      0, 0, 0, 0, 0, 0, 0, 0,
                      0, 0, 0, 0, 0, 0, 0, 0,
                      0, 0, 0, 0, 0, 0, 0, 0,
                      0, 0, 0, 0, 0, 0, 0, 0},
    }
    return setmetatable(obj, {__index = HashIndexTable})
end

function HashIndexTable:add (name, index)
    local slot = self:hash_slot_for(name)
    if index < 255 then
        -- increment by 1, 0 stands for empty
        self.hash_table[slot] = (index + 1) & 0xFF
    else
        self.hash_table[slot] = 0
    end
end

function HashIndexTable:get (name)
    local slot = self:hash_slot_for(name)
    -- subtract 1, 0 stands for empty
    return (self.hash_table[slot] & 0xFF) - 1
end

function HashIndexTable:string_hash (s)
    -- this is not a proper hash, but sufficient for the benchmark,
    -- and very portable!
    return #s * 1402589
end

function HashIndexTable:hash_slot_for (element)
    return (self:string_hash(element) & self.hash_table.length - 1) + 1
end

end -- class HashIndexTable

---------------

local JsonObject = {_CLASS = 'JsonObject'} do
setmetatable(JsonObject, {__index = JsonValue})

function JsonObject.new ()
    local obj = {
        names = Vector.new(),
        values = Vector.new(),
        table = HashIndexTable.new(),
    }
    return setmetatable(obj, {__index = JsonObject})
end

function JsonObject:add (name, value)
    assert(name, 'name is null')
    assert(value, 'value is null')

    self.names:append(name)
    self.values:append(value)
    self.table:add(name, self.names:size())
    return self
end

function JsonObject:get (name)
    assert(name, 'name is null')
    local index = self:index_of(name)
    if index == -1 then
        return nil
    else
        return self.values:at(index)
    end
end

function JsonObject:size ()
    return self.names:size()
end

function JsonObject:is_empty ()
    return self.names:is_empty()
end

function JsonObject:is_object ()
    return true
end

function JsonObject:as_object ()
    return self
end

function JsonObject:index_of (name)
    local index = self.table:get(name)
    if index ~= -1 and name == self.names:at(index) then
        return index
    end
    error('NotImplemented')
end

end -- class JsonObject

local Parser = {_CLASS = 'Parser'} do

local function ParseException (message, offset, line, column)
    return ('JSON:%d:%d (%d): %s'):format(line, column, offset, message)
end

function Parser.new (str)
    local obj = {
        input   = str,
        index   = 0,
        line    = 1,
        capture_start = -1,
        column  = 0,
        current = nil,
        capture_buffer = '',
    }
    return setmetatable(obj, {__index = Parser})
end

function Parser:parse ()
    self:read()
    self:skip_white_space()
    local result = self:read_value()
    self:skip_white_space()
    assert(self:is_end_of_text(), self:error('Unexpected character'))
    return result
end

function Parser:read_value ()
    local current = self.current
    if     current == 'n' then
        return self:read_null()
    elseif current == 't' then
        return self:read_true()
    elseif current == 'f' then
        return self:read_false()
    elseif current == '"' then
        return self:read_string()
    elseif current == '[' then
        return self:read_array()
    elseif current == '{' then
        return self:read_object()
    elseif current == '-' or
           current == '0' or
           current == '1' or
           current == '2' or
           current == '3' or
           current == '4' or
           current == '5' or
           current == '6' or
           current == '7' or
           current == '8' or
           current == '9' then
        return self:read_number()
    else
        error(self:expected('value'))
    end
end

function Parser:read_array ()
    self:read()
    local array = JsonArray.new()
    self:skip_white_space()
    if self:read_char(']') then
        return array
    end

    repeat
        self:skip_white_space()
        array:add(self:read_value())
        self:skip_white_space()
    until not self:read_char(',')

    if not self:read_char(']') then
        error(self:expected("',' or ']'"))
    end
    return array
end

function Parser:read_object ()
    self:read()
    local object = JsonObject.new()
    self:skip_white_space()
    if self:read_char('}') then
        return object
    end

    repeat
        self:skip_white_space()
        local name = self:read_name()
        self:skip_white_space()
        if not self:read_char(':') then
            error(self:expected("':'"))
        end

        self:skip_white_space()
        object:add(name, self:read_value())
        self:skip_white_space()
    until not self:read_char(',')

    if not self:read_char('}') then
        error(self:expected("',' or '}'"))
    end
    return object
end

function Parser:read_name ()
    if self.current ~= '"' then
        error(self:expected('name'))
    end
    return self:read_string_internal()
end

function Parser:read_null ()
    self:read()
    self:read_required_char('u')
    self:read_required_char('l')
    self:read_required_char('l')
    return JsonLiteral.NULL
end

function Parser:read_true ()
    self:read()
    self:read_required_char('r')
    self:read_required_char('u')
    self:read_required_char('e')
    return JsonLiteral.TRUE
end

function Parser:read_false ()
    self:read()
    self:read_required_char('a')
    self:read_required_char('l')
    self:read_required_char('s')
    self:read_required_char('e')
    return JsonLiteral.FALSE
end

function Parser:read_required_char (ch)
    if not self:read_char(ch) then
        error(self:expected("'" .. ch .. "'"))
    end
end

function Parser:read_string ()
    return JsonString.new(self:read_string_internal())
end

function Parser:read_string_internal ()
    self:read()
    self:start_capture()
    while self.current ~= '"' do
        if self.current == '\\' then
            self:pause_capture()
            self:read_escape()
            self:start_capture()
        else
            self:read()
        end
    end
    local str = self:end_capture()
    self:read()
    return str
end

function Parser:read_escape ()
    self:read()
    local current = self.current
    if     current == '"' or
           current == '/' or
           current == '\\' then
        self.capture_buffer = self.capture_buffer .. current
    elseif current == 'b' then
        self.capture_buffer = self.capture_buffer .. "\b"
    elseif current == 'f' then
        self.capture_buffer = self.capture_buffer .. "\f"
    elseif current == 'n' then
        self.capture_buffer = self.capture_buffer .. "\n"
    elseif current == 'r' then
        self.capture_buffer = self.capture_buffer .. "\r"
    elseif current == 't' then
        self.capture_buffer = self.capture_buffer .. "\t"
    else
        error(self:expected('valid escape sequence'))
    end
    self:read()
end

function Parser:read_number ()
    self:start_capture()
    self:read_char('-')
    local first_digit = self.current
    if not self:read_digit() then
        error(self:expected('digit'))
    end

    if first_digit ~= '0' then
        while self:read_digit() do
        end
    end
    self:read_fraction()
    self:read_exponent()
    return JsonNumber.new(self:end_capture())
end

function Parser:read_fraction ()
    if not self:read_char('.') then
        return false
    end
    if not self:read_digit() then
        error(self:expected('digit'))
    end

    while self:read_digit() do
    end
    return true
end

function Parser:read_exponent ()
    if not self:read_char('e') and not self:read_char('E') then
        return false
    end

    if not self:read_char('+') then
        self:read_char('-')
    end

    if not self:read_digit() then
        error(self:expected('digit'))
    end

    while self:read_digit() do
    end

    return true
end

function Parser:read_char (ch)
    if self.current ~= ch then
        return false
    end
    self:read()
    return true
end

function Parser:read_digit ()
    if not self:is_digit() then
        return false
    end
    self:read()
    return true
end

function Parser:skip_white_space ()
    while self:is_white_space() do
        self:read()
    end
end

function Parser:read ()
    if '\n' == self.current then
        self.line   = self.line + 1
        self.column = 0
    end

    self.index = self.index + 1

    if self.index <= #self.input then
        self.current = self.input:sub(self.index, self.index)
    else
        self.current = nil
    end
end

function Parser:start_capture ()
    self.capture_start = self.index
end

function Parser:pause_capture ()
    local end_ = not self.current and self.index or (self.index - 1)
    self.capture_buffer = self.capture_buffer .. self.input:sub(self.capture_start, end_)
    self.capture_start = -1
end

function Parser:end_capture ()
    local end_ = not self.current and self.index or (self.index - 1)

    local captured
    if '' == self.capture_buffer then
        captured = self.input:sub(self.capture_start, end_)
    else
        self.capture_buffer = self.capture_buffer .. self.input:sub(self.capture_start, end_)
        captured = self.capture_buffer
        self.capture_buffer = ''
    end
    self.capture_start = -1
    return captured
end

function Parser:expected (expected)
    if self:is_end_of_text() then
        return self:error('Unexpected end of input')
    else
        return self:error('Expected ' .. expected)
    end
end

function Parser:error (message)
    return ParseException(message, self.index, self.line, self.column - 1)
end

function Parser:is_white_space ()
    local current = self.current
    return ' ' == current or "\t" == current or "\n" == current or "\r" == current
end

function Parser:is_digit ()
    local current = self.current
    return '0' == current or '1' == current or '2' == current or '3' == current or
           '4' == current or '5' == current or '6' == current or
           '7' == current or '8' == current or '9' == current
end

function Parser:is_end_of_text ()
    return self.current == nil
end

end -- class Parser

local json = {} do
setmetatable(json, {__index = benchmark})

local RAP_BENCHMARK_MINIFIED = 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function json:benchmark ()
    return Parser.new(RAP_BENCHMARK_MINIFIED):parse()
end

function json:verify_result (result)
    if not result:is_object() then
        return false
    end
    if not result:as_object():get('head'):is_object() then
        return false
    end
    if not result:as_object():get('operations'):is_array() then
        return false
    end
    return result:as_object():get('operations'):as_array():size() == 156
end

end -- object json

return function(N)
    json:inner_benchmark_loop(N)
end