101 lines
2.3 KiB
Lua
101 lines
2.3 KiB
Lua
--[[
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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 tonumber = tonumber
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local jsonutil = require("json.util")
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local merge = jsonutil.merge
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local util = require("json.decode.util")
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local _ENV = nil
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local digit = lpeg.R("09")
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local digits = digit^1
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-- Illegal octal declaration
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local illegal_octal_detect = #(lpeg.P('0') * digits) * util.denied("Octal numbers")
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local int = (lpeg.P('-') + 0) * (lpeg.R("19") * digits + illegal_octal_detect + digit)
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local frac = lpeg.P('.') * digits
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local exp = lpeg.S("Ee") * (lpeg.S("-+") + 0) * digits
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local nan = lpeg.S("Nn") * lpeg.S("Aa") * lpeg.S("Nn")
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local inf = lpeg.S("Ii") * lpeg.P("nfinity")
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local ninf = lpeg.P('-') * lpeg.S("Ii") * lpeg.P("nfinity")
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local hex = (lpeg.P("0x") + lpeg.P("0X")) * lpeg.R("09","AF","af")^1
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local defaultOptions = {
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nan = true,
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inf = true,
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frac = true,
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exp = true,
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hex = false
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}
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local modeOptions = {}
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modeOptions.strict = {
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nan = false,
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inf = false
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}
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local nan_value = 0/0
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local inf_value = 1/0
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local ninf_value = -1/0
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--[[
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Options: configuration options for number rules
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nan: match NaN
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inf: match Infinity
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frac: match fraction portion (.0)
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exp: match exponent portion (e1)
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DEFAULT: nan, inf, frac, exp
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]]
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local function mergeOptions(options, mode)
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jsonutil.doOptionMerge(options, false, 'number', defaultOptions, mode and modeOptions[mode])
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end
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local function generateLexer(options)
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options = options.number
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local ret = int
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if options.frac then
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ret = ret * (frac + 0)
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else
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ret = ret * (#frac * util.denied("Fractions", "number.frac") + 0)
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end
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if options.exp then
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ret = ret * (exp + 0)
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else
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ret = ret * (#exp * util.denied("Exponents", "number.exp") + 0)
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end
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if options.hex then
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ret = hex + ret
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else
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ret = #hex * util.denied("Hexadecimal", "number.hex") + ret
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end
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-- Capture number now
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ret = ret / tonumber
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if options.nan then
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ret = ret + nan / function() return nan_value end
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else
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ret = ret + #nan * util.denied("NaN", "number.nan")
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end
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if options.inf then
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ret = ret + ninf / function() return ninf_value end + inf / function() return inf_value end
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else
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ret = ret + (#ninf + #inf) * util.denied("+/-Inf", "number.inf")
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end
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return ret
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end
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local number = {
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int = int,
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mergeOptions = mergeOptions,
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generateLexer = generateLexer
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}
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return number
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