mirror of
https://github.com/Myzel394/jsonfly.nvim.git
synced 2025-06-18 20:15:26 +02:00
604 lines
18 KiB
Lua
604 lines
18 KiB
Lua
local VERSION = '20161109.21' -- version history at end of file
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local AUTHOR_NOTE = "-[ JSON.lua package by Jeffrey Friedl (http://regex.info/blog/lua/json) version 20161109.21 ]-"
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local OBJDEF = {
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VERSION = VERSION,
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AUTHOR_NOTE = AUTHOR_NOTE,
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}
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local default_pretty_indent = " "
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local default_pretty_options = { pretty = true, align_keys = false, indent = default_pretty_indent }
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local isArray = { __tostring = function() return "JSON array" end } isArray.__index = isArray
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local isObject = { __tostring = function() return "JSON object" end } isObject.__index = isObject
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function OBJDEF:newArray(tbl)
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return setmetatable(tbl or {}, isArray)
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end
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function OBJDEF:newObject(tbl)
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return setmetatable(tbl or {}, isObject)
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end
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local function getnum(op)
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return type(op) == 'number' and op or op.N
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end
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local isNumber = {
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__tostring = function(T) return T.S end,
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__unm = function(op) return getnum(op) end,
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__concat = function(op1, op2) return tostring(op1) .. tostring(op2) end,
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__add = function(op1, op2) return getnum(op1) + getnum(op2) end,
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__sub = function(op1, op2) return getnum(op1) - getnum(op2) end,
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__mul = function(op1, op2) return getnum(op1) * getnum(op2) end,
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__div = function(op1, op2) return getnum(op1) / getnum(op2) end,
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__mod = function(op1, op2) return getnum(op1) % getnum(op2) end,
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__pow = function(op1, op2) return getnum(op1) ^ getnum(op2) end,
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__lt = function(op1, op2) return getnum(op1) < getnum(op2) end,
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__eq = function(op1, op2) return getnum(op1) == getnum(op2) end,
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__le = function(op1, op2) return getnum(op1) <= getnum(op2) end,
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}
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isNumber.__index = isNumber
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function OBJDEF:asNumber(item)
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if getmetatable(item) == isNumber then
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-- it's already a JSON number object.
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return item
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elseif type(item) == 'table' and type(item.S) == 'string' and type(item.N) == 'number' then
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-- it's a number-object table that lost its metatable, so give it one
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return setmetatable(item, isNumber)
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else
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-- the normal situation... given a number or a string representation of a number....
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local holder = {
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S = tostring(item), -- S is the representation of the number as a string, which remains precise
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N = tonumber(item), -- N is the number as a Lua number.
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}
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return setmetatable(holder, isNumber)
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end
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end
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function OBJDEF:forceString(item)
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if type(item) == 'table' and type(item.S) == 'string' then
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return item.S
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else
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return tostring(item)
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end
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end
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function OBJDEF:forceNumber(item)
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if type(item) == 'table' and type(item.N) == 'number' then
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return item.N
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else
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return tonumber(item)
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end
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end
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local function unicode_codepoint_as_utf8(codepoint)
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--
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-- codepoint is a number
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--
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if codepoint <= 127 then
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return string.char(codepoint)
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elseif codepoint <= 2047 then
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--
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-- 110yyyxx 10xxxxxx <-- useful notation from http://en.wikipedia.org/wiki/Utf8
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--
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local highpart = math.floor(codepoint / 0x40)
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local lowpart = codepoint - (0x40 * highpart)
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return string.char(0xC0 + highpart,
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0x80 + lowpart)
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elseif codepoint <= 65535 then
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--
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-- 1110yyyy 10yyyyxx 10xxxxxx
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--
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local highpart = math.floor(codepoint / 0x1000)
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local remainder = codepoint - 0x1000 * highpart
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local midpart = math.floor(remainder / 0x40)
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local lowpart = remainder - 0x40 * midpart
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highpart = 0xE0 + highpart
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midpart = 0x80 + midpart
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lowpart = 0x80 + lowpart
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--
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-- Check for an invalid character (thanks Andy R. at Adobe).
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-- See table 3.7, page 93, in http://www.unicode.org/versions/Unicode5.2.0/ch03.pdf#G28070
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--
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if ( highpart == 0xE0 and midpart < 0xA0 ) or
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( highpart == 0xED and midpart > 0x9F ) or
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( highpart == 0xF0 and midpart < 0x90 ) or
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( highpart == 0xF4 and midpart > 0x8F )
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then
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return "?"
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else
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return string.char(highpart,
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midpart,
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lowpart)
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end
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else
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--
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-- 11110zzz 10zzyyyy 10yyyyxx 10xxxxxx
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--
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local highpart = math.floor(codepoint / 0x40000)
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local remainder = codepoint - 0x40000 * highpart
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local midA = math.floor(remainder / 0x1000)
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remainder = remainder - 0x1000 * midA
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local midB = math.floor(remainder / 0x40)
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local lowpart = remainder - 0x40 * midB
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return string.char(0xF0 + highpart,
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0x80 + midA,
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0x80 + midB,
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0x80 + lowpart)
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end
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end
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function OBJDEF:onDecodeError(message, text, location, etc)
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if text then
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if location then
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message = string.format("%s at byte %d of: %s", message, location, text)
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else
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message = string.format("%s: %s", message, text)
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end
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end
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if etc ~= nil then
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message = message .. " (" .. OBJDEF:encode(etc) .. ")"
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end
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if self.assert then
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self.assert(false, message)
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else
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assert(false, message)
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end
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end
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function OBJDEF:onTrailingGarbage(json_text, location, parsed_value, etc)
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return self:onDecodeError("trailing garbage", json_text, location, etc)
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end
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OBJDEF.onDecodeOfNilError = OBJDEF.onDecodeError
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OBJDEF.onDecodeOfHTMLError = OBJDEF.onDecodeError
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function OBJDEF:onEncodeError(message, etc)
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if etc ~= nil then
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message = message .. " (" .. OBJDEF:encode(etc) .. ")"
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end
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if self.assert then
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self.assert(false, message)
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else
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assert(false, message)
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end
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end
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local function grok_number(self, text, start, options)
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--
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-- Grab the integer part
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--
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local integer_part = text:match('^-?[1-9]%d*', start)
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or text:match("^-?0", start)
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if not integer_part then
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self:onDecodeError("expected number", text, start, options.etc)
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return nil, start -- in case the error method doesn't abort, return something sensible
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end
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local i = start + integer_part:len()
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--
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-- Grab an optional decimal part
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--
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local decimal_part = text:match('^%.%d+', i) or ""
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i = i + decimal_part:len()
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--
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-- Grab an optional exponential part
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--
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local exponent_part = text:match('^[eE][-+]?%d+', i) or ""
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i = i + exponent_part:len()
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local full_number_text = integer_part .. decimal_part .. exponent_part
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if options.decodeNumbersAsObjects then
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return OBJDEF:asNumber(full_number_text), i
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end
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--
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-- If we're told to stringify under certain conditions, so do.
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-- We punt a bit when there's an exponent by just stringifying no matter what.
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-- I suppose we should really look to see whether the exponent is actually big enough one
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-- way or the other to trip stringification, but I'll be lazy about it until someone asks.
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--
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if (options.decodeIntegerStringificationLength
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and
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(integer_part:len() >= options.decodeIntegerStringificationLength or exponent_part:len() > 0))
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or
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(options.decodeDecimalStringificationLength
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and
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(decimal_part:len() >= options.decodeDecimalStringificationLength or exponent_part:len() > 0))
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then
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return full_number_text, i -- this returns the exact string representation seen in the original JSON
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end
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local as_number = tonumber(full_number_text)
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if not as_number then
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self:onDecodeError("bad number", text, start, options.etc)
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return nil, start -- in case the error method doesn't abort, return something sensible
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end
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return as_number, i
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end
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local function grok_string(self, text, start, options)
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if text:sub(start,start) ~= '"' then
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self:onDecodeError("expected string's opening quote", text, start, options.etc)
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return nil, start -- in case the error method doesn't abort, return something sensible
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end
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local i = start + 1 -- +1 to bypass the initial quote
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local text_len = text:len()
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local VALUE = ""
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while i <= text_len do
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local c = text:sub(i,i)
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if c == '"' then
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return VALUE, i + 1
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end
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if c ~= '\\' then
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VALUE = VALUE .. c
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i = i + 1
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elseif text:match('^\\b', i) then
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VALUE = VALUE .. "\b"
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i = i + 2
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elseif text:match('^\\f', i) then
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VALUE = VALUE .. "\f"
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i = i + 2
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elseif text:match('^\\n', i) then
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VALUE = VALUE .. "\n"
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i = i + 2
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elseif text:match('^\\r', i) then
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VALUE = VALUE .. "\r"
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i = i + 2
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elseif text:match('^\\t', i) then
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VALUE = VALUE .. "\t"
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i = i + 2
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else
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local hex = text:match('^\\u([0123456789aAbBcCdDeEfF][0123456789aAbBcCdDeEfF][0123456789aAbBcCdDeEfF][0123456789aAbBcCdDeEfF])', i)
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if hex then
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i = i + 6 -- bypass what we just read
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-- We have a Unicode codepoint. It could be standalone, or if in the proper range and
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-- followed by another in a specific range, it'll be a two-code surrogate pair.
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local codepoint = tonumber(hex, 16)
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if codepoint >= 0xD800 and codepoint <= 0xDBFF then
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-- it's a hi surrogate... see whether we have a following low
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local lo_surrogate = text:match('^\\u([dD][cdefCDEF][0123456789aAbBcCdDeEfF][0123456789aAbBcCdDeEfF])', i)
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if lo_surrogate then
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i = i + 6 -- bypass the low surrogate we just read
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codepoint = 0x2400 + (codepoint - 0xD800) * 0x400 + tonumber(lo_surrogate, 16)
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else
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-- not a proper low, so we'll just leave the first codepoint as is and spit it out.
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end
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end
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VALUE = VALUE .. unicode_codepoint_as_utf8(codepoint)
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else
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-- just pass through what's escaped
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VALUE = VALUE .. text:match('^\\(.)', i)
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i = i + 2
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end
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end
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end
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self:onDecodeError("unclosed string", text, start, options.etc)
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return nil, start -- in case the error method doesn't abort, return something sensible
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end
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local function skip_whitespace(text, start)
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local _, match_end = text:find("^[ \n\r\t]+", start) -- [http://www.ietf.org/rfc/rfc4627.txt] Section 2
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if match_end then
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return match_end + 1
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else
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return start
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end
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end
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-- Count newlines in `text` up to `start`
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local function count_newlines(text, start)
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local _, count = text:sub(1, start):gsub('\n', '\n')
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return count
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end
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-- Count characters from `i` to previous newline
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local function get_relative_i(text, i)
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local _, count = text:sub(1, i):gsub('\n', '\n')
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return i - count
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end
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local grok_one -- assigned later
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local function grok_object(self, text, start, options)
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if text:sub(start,start) ~= '{' then
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self:onDecodeError("expected '{'", text, start, options.etc)
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return nil, start -- in case the error method doesn't abort, return something sensible
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end
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local i = skip_whitespace(text, start + 1) -- +1 to skip the '{'
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local VALUE = self.strictTypes and self:newObject { } or { }
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if text:sub(i,i) == '}' then
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return VALUE, i + 1
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end
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local text_len = text:len()
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while i <= text_len do
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local key, new_i = grok_string(self, text, i, options)
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---- Find start of JSON key
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local key_start = i
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local key_end = new_i - 2
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local newlines = count_newlines(text, key_start)
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local relative_start = get_relative_i(text, key_start)
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i = skip_whitespace(text, new_i)
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if text:sub(i, i) ~= ':' then
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self:onDecodeError("expected colon", text, i, options.etc)
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return nil, i -- in case the error method doesn't abort, return something sensible
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end
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i = skip_whitespace(text, i + 1)
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local new_val, new_i = grok_one(self, text, i, options)
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---- Add start position so we can quickly jump to it
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VALUE[key] = {
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value = new_val,
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key_start = key_start,
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key_end = key_end,
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newlines = newlines or 0,
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relative_start = relative_start,
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}
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--
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-- Expect now either '}' to end things, or a ',' to allow us to continue.
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--
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i = skip_whitespace(text, new_i)
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local c = text:sub(i,i)
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if c == '}' then
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return VALUE, i + 1
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end
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if text:sub(i, i) ~= ',' then
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self:onDecodeError("expected comma or '}'", text, i, options.etc)
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return nil, i -- in case the error method doesn't abort, return something sensible
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end
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i = skip_whitespace(text, i + 1)
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end
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self:onDecodeError("unclosed '{'", text, start, options.etc)
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return nil, start -- in case the error method doesn't abort, return something sensible
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end
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local function grok_array(self, text, start, options)
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if text:sub(start,start) ~= '[' then
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self:onDecodeError("expected '['", text, start, options.etc)
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return nil, start -- in case the error method doesn't abort, return something sensible
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end
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local i = skip_whitespace(text, start + 1) -- +1 to skip the '['
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local VALUE = self.strictTypes and self:newArray { } or { }
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if text:sub(i,i) == ']' then
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return VALUE, i + 1
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end
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local VALUE_INDEX = 1
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local text_len = text:len()
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while i <= text_len do
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local val, new_i = grok_one(self, text, i, options)
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local newlines = count_newlines(text, i)
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local relative_start = get_relative_i(text, i)
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-- can't table.insert(VALUE, val) here because it's a no-op if val is nil
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VALUE[VALUE_INDEX] = {
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value = val,
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key_start = new_i,
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key_end = new_i,
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newlines = newlines or 0,
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relative_start = relative_start,
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}
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VALUE_INDEX = VALUE_INDEX + 1
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i = skip_whitespace(text, new_i)
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--
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-- Expect now either ']' to end things, or a ',' to allow us to continue.
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--
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local c = text:sub(i,i)
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if c == ']' then
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return VALUE, i + 1
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end
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if text:sub(i, i) ~= ',' then
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self:onDecodeError("expected comma or ']'", text, i, options.etc)
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return nil, i -- in case the error method doesn't abort, return something sensible
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end
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i = skip_whitespace(text, i + 1)
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end
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self:onDecodeError("unclosed '['", text, start, options.etc)
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return nil, i -- in case the error method doesn't abort, return something sensible
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end
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grok_one = function(self, text, start, options)
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-- Skip any whitespace
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start = skip_whitespace(text, start)
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if start > text:len() then
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self:onDecodeError("unexpected end of string", text, nil, options.etc)
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return nil, start -- in case the error method doesn't abort, return something sensible
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end
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if text:find('^"', start) then
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return grok_string(self, text, start, options.etc)
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elseif text:find('^[-0123456789 ]', start) then
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return grok_number(self, text, start, options)
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elseif text:find('^%{', start) then
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return grok_object(self, text, start, options)
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elseif text:find('^%[', start) then
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return grok_array(self, text, start, options)
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elseif text:find('^true', start) then
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return true, start + 4
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elseif text:find('^false', start) then
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return false, start + 5
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elseif text:find('^null', start) then
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return nil, start + 4
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else
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self:onDecodeError("can't parse JSON", text, start, options.etc)
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return nil, 1 -- in case the error method doesn't abort, return something sensible
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end
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end
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function OBJDEF:decode(text, etc, options)
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--
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-- If the user didn't pass in a table of decode options, make an empty one.
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--
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if type(options) ~= 'table' then
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options = {}
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end
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--
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-- If they passed in an 'etc' argument, stuff it into the options.
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-- (If not, any 'etc' field in the options they passed in remains to be used)
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--
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if etc ~= nil then
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options.etc = etc
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end
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if text:match('^%s*$') then
|
|
-- an empty string is nothing, but not an error
|
|
return nil
|
|
end
|
|
|
|
if text:match('^%s*<') then
|
|
-- Can't be JSON... we'll assume it's HTML
|
|
local error_message = "HTML passed to JSON:decode()"
|
|
self:onDecodeOfHTMLError(error_message, text, nil, options.etc)
|
|
return nil, error_message -- in case the error method doesn't abort, return something sensible
|
|
end
|
|
|
|
--
|
|
-- Ensure that it's not UTF-32 or UTF-16.
|
|
-- Those are perfectly valid encodings for JSON (as per RFC 4627 section 3),
|
|
-- but this package can't handle them.
|
|
--
|
|
if text:sub(1,1):byte() == 0 or (text:len() >= 2 and text:sub(2,2):byte() == 0) then
|
|
local error_message = "JSON package groks only UTF-8, sorry"
|
|
self:onDecodeError(error_message, text, nil, options.etc)
|
|
return nil, error_message -- in case the error method doesn't abort, return something sensible
|
|
end
|
|
|
|
--
|
|
-- apply global options
|
|
--
|
|
if options.decodeNumbersAsObjects == nil then
|
|
options.decodeNumbersAsObjects = self.decodeNumbersAsObjects
|
|
end
|
|
if options.decodeIntegerStringificationLength == nil then
|
|
options.decodeIntegerStringificationLength = self.decodeIntegerStringificationLength
|
|
end
|
|
if options.decodeDecimalStringificationLength == nil then
|
|
options.decodeDecimalStringificationLength = self.decodeDecimalStringificationLength
|
|
end
|
|
|
|
--
|
|
-- Finally, go parse it
|
|
--
|
|
local success, value, next_i = pcall(grok_one, self, text, 1, options)
|
|
|
|
if success then
|
|
|
|
local error_message = nil
|
|
if next_i ~= #text + 1 then
|
|
-- something's left over after we parsed the first thing.... whitespace is allowed.
|
|
next_i = skip_whitespace(text, next_i)
|
|
|
|
-- if we have something left over now, it's trailing garbage
|
|
if next_i ~= #text + 1 then
|
|
value, error_message = self:onTrailingGarbage(text, next_i, value, options.etc)
|
|
end
|
|
end
|
|
return value, error_message
|
|
|
|
else
|
|
|
|
-- If JSON:onDecodeError() didn't abort out of the pcall, we'll have received
|
|
-- the error message here as "value", so pass it along as an assert.
|
|
local error_message = value
|
|
if self.assert then
|
|
self.assert(false, error_message)
|
|
else
|
|
assert(false, error_message)
|
|
end
|
|
-- ...and if we're still here (because the assert didn't throw an error),
|
|
-- return a nil and throw the error message on as a second arg
|
|
return nil, error_message
|
|
|
|
end
|
|
end
|
|
|
|
function OBJDEF.__tostring()
|
|
return "JSON encode/decode package"
|
|
end
|
|
|
|
OBJDEF.__index = OBJDEF
|
|
|
|
function OBJDEF:new(args)
|
|
local new = { }
|
|
|
|
if args then
|
|
for key, val in pairs(args) do
|
|
new[key] = val
|
|
end
|
|
end
|
|
|
|
return setmetatable(new, OBJDEF)
|
|
end
|
|
|
|
return OBJDEF:new()
|
|
|
|
|