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core/lua/ml_json.sas

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/**
@file ml_json.sas
@brief Compiles the json.lua lua file
@details Writes json.lua to the work directory
and then includes it.
Usage:
%ml_json()
**/
%macro ml_json();
data _null_;
file "%sysfunc(pathname(work))/ml_json.lua";
put '-- NOTE - THE COPYRIGHT BELOW IS IN RELATION TO THE JSON.LUA FILE ONLY ';
put '-- THIS FILE STARTS ON THE NEXT LINE AND WILL FINISH WITH "JSON.LUA ENDS HERE" ';
put '-- ';
put '-- json.lua ';
put '-- ';
put '-- Copyright (c) 2019 rxi ';
put '-- ';
put '-- Permission is hereby granted, free of charge, to any person obtaining a copy of ';
put '-- this software and associated documentation files (the "Software"), to deal in ';
put '-- the Software without restriction, including without limitation the rights to ';
put '-- use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies ';
put '-- of the Software, and to permit persons to whom the Software is furnished to do ';
put '-- so, subject to the following conditions: ';
put '-- ';
put '-- The above copyright notice and this permission notice shall be included in all ';
put '-- copies or substantial portions of the Software. ';
put '-- ';
put '-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR ';
put '-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, ';
put '-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE ';
put '-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER ';
put '-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, ';
put '-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE ';
put '-- SOFTWARE. ';
put '-- ';
put ' ';
put 'json = { _version = "0.1.2" } ';
put ' ';
put '------------------------------------------------------------------------------- ';
put '-- Encode ';
put '------------------------------------------------------------------------------- ';
put ' ';
put 'local encode ';
put ' ';
put 'local escape_char_map = { ';
put ' [ "\\" ] = "\\\\", ';
put ' [ "\"" ] = "\\\"", ';
put ' [ "\b" ] = "\\b", ';
put ' [ "\f" ] = "\\f", ';
put ' [ "\n" ] = "\\n", ';
put ' [ "\r" ] = "\\r", ';
put ' [ "\t" ] = "\\t", ';
put '} ';
put ' ';
put 'local escape_char_map_inv = { [ "\\/" ] = "/" } ';
put 'for k, v in pairs(escape_char_map) do ';
put ' escape_char_map_inv[v] = k ';
put 'end ';
put ' ';
put 'local function escape_char(c) ';
put ' return escape_char_map[c] or string.format("\\u%04x", c:byte()) ';
put 'end ';
put ' ';
put 'local function encode_nil(val) ';
put ' return "null" ';
put 'end ';
put ' ';
put 'local function encode_table(val, stack) ';
put ' local res = {} ';
put ' stack = stack or {} ';
put ' ';
put ' -- Circular reference? ';
put ' if stack[val] then error("circular reference") end ';
put ' ';
put ' stack[val] = true ';
put ' ';
put ' if rawget(val, 1) ~= nil or next(val) == nil then ';
put ' -- Treat as array -- check keys are valid and it is not sparse ';
put ' local n = 0 ';
put ' for k in pairs(val) do ';
put ' if type(k) ~= "number" then ';
put ' error("invalid table: mixed or invalid key types") ';
put ' end ';
put ' n = n + 1 ';
put ' end ';
put ' if n ~= #val then ';
put ' error("invalid table: sparse array") ';
put ' end ';
put ' -- Encode ';
put ' for i, v in ipairs(val) do ';
put ' table.insert(res, encode(v, stack)) ';
put ' end ';
put ' stack[val] = nil ';
put ' return "[" .. table.concat(res, ",") .. "]" ';
put ' else ';
put ' -- Treat as an object ';
put ' for k, v in pairs(val) do ';
put ' if type(k) ~= "string" then ';
put ' error("invalid table: mixed or invalid key types") ';
put ' end ';
put ' table.insert(res, encode(k, stack) .. ":" .. encode(v, stack)) ';
put ' end ';
put ' stack[val] = nil ';
put ' return "{" .. table.concat(res, ",") .. "}" ';
put ' end ';
put 'end ';
put ' ';
put 'local function encode_string(val) ';
put ' return ''"'' .. val:gsub(''[%z\1-\31\\"]'', escape_char) .. ''"'' ';
put 'end ';
put ' ';
put 'local function encode_number(val) ';
put ' -- Check for NaN, -inf and inf ';
put ' if val ~= val or val <= -math.huge or val >= math.huge then ';
put ' error("unexpected number value ''" .. tostring(val) .. "''") ';
put ' end ';
put ' return string.format("%.14g", val) ';
put 'end ';
put ' ';
put 'local type_func_map = { ';
put ' [ "nil" ] = encode_nil, ';
put ' [ "table" ] = encode_table, ';
put ' [ "string" ] = encode_string, ';
put ' [ "number" ] = encode_number, ';
put ' [ "boolean" ] = tostring, ';
put '} ';
put ' ';
put 'encode = function(val, stack) ';
put ' local t = type(val) ';
put ' local f = type_func_map[t] ';
put ' if f then ';
put ' return f(val, stack) ';
put ' end ';
put ' error("unexpected type ''" .. t .. "''") ';
put 'end ';
put ' ';
put 'function json.encode(val) ';
put ' return ( encode(val) ) ';
put 'end ';
put ' ';
put '------------------------------------------------------------------------------- ';
put '-- Decode ';
put '------------------------------------------------------------------------------- ';
put 'local parse ';
put 'local function create_set(...) ';
put ' local res = {} ';
put ' for i = 1, select("#", ...) do ';
put ' res[ select(i, ...) ] = true ';
put ' end ';
put ' return res ';
put 'end ';
put ' ';
put 'local space_chars = create_set(" ", "\t", "\r", "\n") ';
put 'local delim_chars = create_set(" ", "\t", "\r", "\n", "]", "}", ",") ';
put 'local escape_chars = create_set("\\", "/", ''"'', "b", "f", "n", "r", "t", "u") ';
put 'local literals = create_set("true", "false", "null") ';
put ' ';
put 'local literal_map = { ';
put ' [ "true" ] = true, ';
put ' [ "false" ] = false, ';
put ' [ "null" ] = nil, ';
put '} ';
put ' ';
put 'local function next_char(str, idx, set, negate) ';
put ' for i = idx, #str do ';
put ' if set[str:sub(i, i)] ~= negate then ';
put ' return i ';
put ' end ';
put ' end ';
put ' return #str + 1 ';
put 'end ';
put ' ';
put 'local function decode_error(str, idx, msg) ';
put ' local line_count = 1 ';
put ' local col_count = 1 ';
put ' for i = 1, idx - 1 do ';
put ' col_count = col_count + 1 ';
put ' if str:sub(i, i) == "\n" then ';
put ' line_count = line_count + 1 ';
put ' col_count = 1 ';
put ' end ';
put ' end ';
put ' error( string.format("%s at line %d col %d", msg, line_count, col_count) ) ';
put 'end ';
put ' ';
put 'local function codepoint_to_utf8(n) ';
put ' -- http://scripts.sil.org/cms/scripts/page.php?site_id=nrsi&id=iws-appendixa ';
put ' local f = math.floor ';
put ' if n <= 0x7f then ';
put ' return string.char(n) ';
put ' elseif n <= 0x7ff then ';
put ' return string.char(f(n / 64) + 192, n % 64 + 128) ';
put ' elseif n <= 0xffff then ';
put ' return string.char(f(n / 4096) + 224, f(n % 4096 / 64) + 128, n % 64 + 128) ';
put ' elseif n <= 0x10ffff then ';
put ' return string.char(f(n / 262144) + 240, f(n % 262144 / 4096) + 128, ';
put ' f(n % 4096 / 64) + 128, n % 64 + 128) ';
put ' end ';
put ' error( string.format("invalid unicode codepoint ''%x''", n) ) ';
put 'end ';
put ' ';
put 'local function parse_unicode_escape(s) ';
put ' local n1 = tonumber( s:sub(3, 6), 16 ) ';
put ' local n2 = tonumber( s:sub(9, 12), 16 ) ';
put ' -- Surrogate pair? ';
put ' if n2 then ';
put ' return codepoint_to_utf8((n1 - 0xd800) * 0x400 + (n2 - 0xdc00) + 0x10000) ';
put ' else ';
put ' return codepoint_to_utf8(n1) ';
put ' end ';
put 'end ';
put ' ';
put 'local function parse_string(str, i) ';
put ' local has_unicode_escape = false ';
put ' local has_surrogate_escape = false ';
put ' local has_escape = false ';
put ' local last ';
put ' for j = i + 1, #str do ';
put ' local x = str:byte(j) ';
put ' if x < 32 then ';
put ' decode_error(str, j, "control character in string") ';
put ' end ';
put ' if last == 92 then -- "\\" (escape char) ';
put ' if x == 117 then -- "u" (unicode escape sequence) ';
put ' local hex = str:sub(j + 1, j + 5) ';
put ' if not hex:find("%x%x%x%x") then ';
put ' decode_error(str, j, "invalid unicode escape in string") ';
put ' end ';
put ' if hex:find("^[dD][89aAbB]") then ';
put ' has_surrogate_escape = true ';
put ' else ';
put ' has_unicode_escape = true ';
put ' end ';
put ' else ';
put ' local c = string.char(x) ';
put ' if not escape_chars[c] then ';
put ' decode_error(str, j, "invalid escape char ''" .. c .. "'' in string") ';
put ' end ';
put ' has_escape = true ';
put ' end ';
put ' last = nil ';
put ' elseif x == 34 then -- ''"'' (end of string) ';
put ' local s = str:sub(i + 1, j - 1) ';
put ' if has_surrogate_escape then ';
put ' s = s:gsub("\\u[dD][89aAbB]..\\u....", parse_unicode_escape) ';
put ' end ';
put ' if has_unicode_escape then ';
put ' s = s:gsub("\\u....", parse_unicode_escape) ';
put ' end ';
put ' if has_escape then ';
put ' s = s:gsub("\\.", escape_char_map_inv) ';
put ' end ';
put ' return s, j + 1 ';
put ' else ';
put ' last = x ';
put ' end ';
put ' end ';
put ' decode_error(str, i, "expected closing quote for string") ';
put 'end ';
put ' ';
put 'local function parse_number(str, i) ';
put ' local x = next_char(str, i, delim_chars) ';
put ' local s = str:sub(i, x - 1) ';
put ' local n = tonumber(s) ';
put ' if not n then ';
put ' decode_error(str, i, "invalid number ''" .. s .. "''") ';
put ' end ';
put ' return n, x ';
put 'end ';
put ' ';
put 'local function parse_literal(str, i) ';
put ' local x = next_char(str, i, delim_chars) ';
put ' local word = str:sub(i, x - 1) ';
put ' if not literals[word] then ';
put ' decode_error(str, i, "invalid literal ''" .. word .. "''") ';
put ' end ';
put ' return literal_map[word], x ';
put 'end ';
put ' ';
put 'local function parse_array(str, i) ';
put ' local res = {} ';
put ' local n = 1 ';
put ' i = i + 1 ';
put ' while 1 do ';
put ' local x ';
put ' i = next_char(str, i, space_chars, true) ';
put ' -- Empty / end of array? ';
put ' if str:sub(i, i) == "]" then ';
put ' i = i + 1 ';
put ' break ';
put ' end ';
put ' -- Read token ';
put ' x, i = parse(str, i) ';
put ' res[n] = x ';
put ' n = n + 1 ';
put ' -- Next token ';
put ' i = next_char(str, i, space_chars, true) ';
put ' local chr = str:sub(i, i) ';
put ' i = i + 1 ';
put ' if chr == "]" then break end ';
put ' if chr ~= "," then decode_error(str, i, "expected '']'' or '',''") end ';
put ' end ';
put ' return res, i ';
put 'end ';
put ' ';
put 'local function parse_object(str, i) ';
put ' local res = {} ';
put ' i = i + 1 ';
put ' while 1 do ';
put ' local key, val ';
put ' i = next_char(str, i, space_chars, true) ';
put ' -- Empty / end of object? ';
put ' if str:sub(i, i) == "}" then ';
put ' i = i + 1 ';
put ' break ';
put ' end ';
put ' -- Read key ';
put ' if str:sub(i, i) ~= ''"'' then ';
put ' decode_error(str, i, "expected string for key") ';
put ' end ';
put ' key, i = parse(str, i) ';
put ' -- Read '':'' delimiter ';
put ' i = next_char(str, i, space_chars, true) ';
put ' if str:sub(i, i) ~= ":" then ';
put ' decode_error(str, i, "expected '':'' after key") ';
put ' end ';
put ' i = next_char(str, i + 1, space_chars, true) ';
put ' -- Read value ';
put ' val, i = parse(str, i) ';
put ' -- Set ';
put ' res[key] = val ';
put ' -- Next token ';
put ' i = next_char(str, i, space_chars, true) ';
put ' local chr = str:sub(i, i) ';
put ' i = i + 1 ';
put ' if chr == "}" then break end ';
put ' if chr ~= "," then decode_error(str, i, "expected ''}'' or '',''") end ';
put ' end ';
put ' return res, i ';
put 'end ';
put ' ';
put 'local char_func_map = { ';
put ' [ ''"'' ] = parse_string, ';
put ' [ "0" ] = parse_number, ';
put ' [ "1" ] = parse_number, ';
put ' [ "2" ] = parse_number, ';
put ' [ "3" ] = parse_number, ';
put ' [ "4" ] = parse_number, ';
put ' [ "5" ] = parse_number, ';
put ' [ "6" ] = parse_number, ';
put ' [ "7" ] = parse_number, ';
put ' [ "8" ] = parse_number, ';
put ' [ "9" ] = parse_number, ';
put ' [ "-" ] = parse_number, ';
put ' [ "t" ] = parse_literal, ';
put ' [ "f" ] = parse_literal, ';
put ' [ "n" ] = parse_literal, ';
put ' [ "[" ] = parse_array, ';
put ' [ "{" ] = parse_object, ';
put '} ';
put ' ';
put 'parse = function(str, idx) ';
put ' local chr = str:sub(idx, idx) ';
put ' local f = char_func_map[chr] ';
put ' if f then ';
put ' return f(str, idx) ';
put ' end ';
put ' decode_error(str, idx, "unexpected character ''" .. chr .. "''") ';
put 'end ';
put ' ';
put 'function json.decode(str) ';
put ' if type(str) ~= "string" then ';
put ' error("expected argument of type string, got " .. type(str)) ';
put ' end ';
put ' local res, idx = parse(str, next_char(str, 1, space_chars, true)) ';
put ' idx = next_char(str, idx, space_chars, true) ';
put ' if idx <= #str then ';
put ' decode_error(str, idx, "trailing garbage") ';
put ' end ';
put ' return res ';
put 'end ';
put ' ';
put 'return json ';
put ' ';
put '-- JSON.LUA ENDS HERE ';
run;
/* ensure big enough lrecl to avoid lua compilation issues */
%local optval;
%let optval=%sysfunc(getoption(lrecl));
options lrecl=1024;
/* execute the lua code by using a .lua extension */
%inc "%sysfunc(pathname(work))/ml_json.lua" /source2;
options lrecl=&optval;
%mend ml_json;
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