122 lines
3.4 KiB
Lua
122 lines
3.4 KiB
Lua
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--[[
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Licensed according to the included 'LICENSE' document
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Author: Thomas Harning Jr <harningt@gmail.com>
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]]
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local lpeg = require("lpeg")
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local select = select
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local pairs, ipairs = pairs, ipairs
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local tonumber = tonumber
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local string_char = require("string").char
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local rawset = rawset
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local jsonutil = require("json.util")
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local error = error
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local setmetatable = setmetatable
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local table_concat = require("table").concat
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local merge = require("json.util").merge
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local _ENV = nil
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local function get_invalid_character_info(input, index)
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local parsed = input:sub(1, index)
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local bad_character = input:sub(index, index)
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local _, line_number = parsed:gsub('\n',{})
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local last_line = parsed:match("\n([^\n]+.)$") or parsed
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return line_number, #last_line, bad_character, last_line
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end
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local function build_report(msg)
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local fmt = msg:gsub("%%", "%%%%") .. " @ character: %i %i:%i [%s] line:\n%s"
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return lpeg.P(function(data, pos)
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local line, line_index, bad_char, last_line = get_invalid_character_info(data, pos)
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local text = fmt:format(pos, line, line_index, bad_char, last_line)
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error(text)
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end) * 1
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end
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local function unexpected()
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local msg = "unexpected character"
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return build_report(msg)
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end
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local function denied(item, option)
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local msg
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if option then
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msg = ("'%s' denied by option set '%s'"):format(item, option)
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else
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msg = ("'%s' denied"):format(item)
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end
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return build_report(msg)
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end
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-- 09, 0A, 0B, 0C, 0D, 20
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local ascii_space = lpeg.S("\t\n\v\f\r ")
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local unicode_space
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do
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local chr = string_char
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local u_space = ascii_space
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-- \u0085 \u00A0
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u_space = u_space + lpeg.P(chr(0xC2)) * lpeg.S(chr(0x85) .. chr(0xA0))
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-- \u1680 \u180E
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u_space = u_space + lpeg.P(chr(0xE1)) * (lpeg.P(chr(0x9A, 0x80)) + chr(0xA0, 0x8E))
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-- \u2000 - \u200A, also 200B
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local spacing_end = ""
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for i = 0x80,0x8b do
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spacing_end = spacing_end .. chr(i)
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end
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-- \u2028 \u2029 \u202F
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spacing_end = spacing_end .. chr(0xA8) .. chr(0xA9) .. chr(0xAF)
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u_space = u_space + lpeg.P(chr(0xE2, 0x80)) * lpeg.S(spacing_end)
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-- \u205F
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u_space = u_space + lpeg.P(chr(0xE2, 0x81, 0x9F))
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-- \u3000
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u_space = u_space + lpeg.P(chr(0xE3, 0x80, 0x80))
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-- BOM \uFEFF
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u_space = u_space + lpeg.P(chr(0xEF, 0xBB, 0xBF))
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unicode_space = u_space
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end
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local identifier = lpeg.R("AZ","az","__") * lpeg.R("AZ","az", "__", "09") ^0
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local hex = lpeg.R("09","AF","af")
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local hexpair = hex * hex
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local comments = {
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cpp = lpeg.P("//") * (1 - lpeg.P("\n"))^0 * lpeg.P("\n"),
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c = lpeg.P("/*") * (1 - lpeg.P("*/"))^0 * lpeg.P("*/")
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}
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local comment = comments.cpp + comments.c
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local ascii_ignored = (ascii_space + comment)^0
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local unicode_ignored = (unicode_space + comment)^0
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-- Parse the lpeg version skipping patch-values
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-- LPEG <= 0.7 have no version value... so 0.7 is value
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local DecimalLpegVersion = lpeg.version and tonumber(lpeg.version():match("^(%d+%.%d+)")) or 0.7
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local function setObjectKeyForceNumber(t, key, value)
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key = tonumber(key) or key
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return rawset(t, key, value)
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end
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local util = {
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unexpected = unexpected,
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denied = denied,
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ascii_space = ascii_space,
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unicode_space = unicode_space,
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identifier = identifier,
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hex = hex,
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hexpair = hexpair,
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comments = comments,
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comment = comment,
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ascii_ignored = ascii_ignored,
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unicode_ignored = unicode_ignored,
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DecimalLpegVersion = DecimalLpegVersion,
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get_invalid_character_info = get_invalid_character_info,
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setObjectKeyForceNumber = setObjectKeyForceNumber
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}
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return util
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