MediaWiki:Gadget-relaxed-json.js

/* Adopted from Wikidata to Gratisdata Copyright (c) 2013, Oleg Grenrus All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of the Oleg Grenrus nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL OLEG GRENRUS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. (function {  "use strict";

// slightly different from ES5 some, without cast to boolean // [x, y, z].some(f): // ES5: !! ( f(x) || f(y) || f(z) || false) // this:   ( f(x) || f(y) || f(z) || false) function some(array, f) { var acc = false; for (var i = 0; i < array.length; i++) { acc = f(array[i], i, array); if (acc) { return acc; }   }    return acc; }

function makeLexer(tokenSpecs) { return function (contents) { var tokens = []; var line = 1;

function findToken { return some(tokenSpecs, function (tokenSpec) {         var m = tokenSpec.re.exec(contents);          if (m) {            var raw = m[0];            contents = contents.slice(raw.length);            return {              raw: raw,              matched: tokenSpec.f(m, line),            };          }        }); }

while (contents !== "") { var matched = findToken;

if (!matched) { var err = new SyntaxError("Unexpected character: " + contents[0] + "; input: " + contents.substr(0, 100)); err.line = line; throw err; }

// add line to token matched.matched.line = line;

// count lines line += matched.raw.replace(/[^\n]/g, "").length;

tokens.push(matched.matched); }

return tokens; }; }

function fStringSingle(m) { // String in single quotes var content = m[1].replace(/([^'\\]|\\['bnrtf\\]|\\u[0-9a-fA-F]{4})/g, function (mm) {     if (mm === "\"") {        return "\\\"";      } else if (mm === "\\'") {        return "'";      } else {        return mm;      }    });

return { type: "string", match: "\"" + content + "\"", value: JSON.parse("\"" + content + "\""), // abusing real JSON.parse to unquote string }; }

function fStringDouble(m) { return { type: "string", match: m[0], value: JSON.parse(m[0]), }; }

function fIdentifier(m) { // identifiers are transformed into strings return { type: "string", value: m[0], match: "\"" + m[0].replace(/./g, function (c) {       return c === "\\" ? "\\\\" : c;      }) + "\"", }; }

function fComment(m) { // comments are whitespace, leave only linefeeds return { type: " ", match: m[0].replace(/./g, function (c) {     return (/\s/).test(c) ? c : " ";    }) }; }

function fNumber(m) { return { type: "number", match: m[0], value: parseFloat(m[0]), }; }

function fKeyword(m) { var value; switch (m[1]) { case "null": value = null; break; case "true": value = true; break; case "false": value = false; break; // no default }   return { type: "atom", match: m[0], value: value, }; }

function makeTokenSpecs(relaxed) { function f(type) { return function (m) { return { type: type, match: m[0] }; };   }

var ret = [ { re: /^\s+/, f: f(" ") }, { re: /^\{/, f: f("{") }, { re: /^\}/, f: f("}") }, { re: /^\[/, f: f("[") }, { re: /^\]/, f: f("]") }, { re: /^,/, f: f(",") }, { re: /^:/, f: f(":") }, { re: /^(true|false|null)/, f: fKeyword }, { re: /^\-?\d+(\.\d+)?([eE][+-]?\d+)?/, f: fNumber }, { re: /^"([^"\\]|\\["bnrtf\\\/]|\\u[0-9a-fA-F]{4})*"/, f: fStringDouble }, ];

// additional stuff if (relaxed) { ret = ret.concat([       { re: /^'(([^'\\]|\\['bnrtf\\\/]|\\u[0-9a-fA-F]{4})*)'/, f: fStringSingle },        { re: /^\/\/.*?(?:\r\n|\r|\n)/, f: fComment },        { re: /^\/\*[\s\S]*?\*\//, f: fComment },        { re: /^[$a-zA-Z0-9_\-+\.\*\?!\|&%\^\/#\\]+/, f: fIdentifier },      ]); }

return ret; }

var lexer = makeLexer(makeTokenSpecs(true)); var strictLexer = makeLexer(makeTokenSpecs(false));

function previousNWSToken(tokens, index) { for (index >= 0; index--) { if (tokens[index].type !== " ") { return index; }   }  }

function stripTrailingComma(tokens) { var res = [];

tokens.forEach(function (token, index) {     if (token.type === "]" || token.type === "}") {        // go backwards as long as there is whitespace, until first comma        var commaI = previousNWSToken(res, index - 1);

if (commaI && res[commaI].type === ",") { var preCommaI = previousNWSToken(res, commaI - 1); if (preCommaI && res[preCommaI].type !== "[" && res[preCommaI].type !== "{") { res[commaI] = { type: " ", match: " ", line: tokens[commaI].line, };         }        }      }

res.push(token); });

return res; }

function transform(text) { // Tokenize contents var tokens = lexer(text);

// remove trailing commas tokens = stripTrailingComma(tokens);

// concat stuff return tokens.reduce(function (str, token) {     return str + token.match;    }, ""); }

function popToken(tokens, state) { var token = tokens[state.pos]; state.pos += 1;

if (!token) { var line = tokens.length !== 0 ? tokens[tokens.length - 1].line : 1; return { type: "eof", line: line }; }

return token; }

function strToken(token) { switch (token.type) { case "atom": case "string": case "number": return token.type + " " + token.match; case "eof": return "end-of-file"; default: return "'" + token.type + "'"; } }

function skipColon(tokens, state) { var colon = popToken(tokens, state); if (colon.type !== ":") { var message = "Unexpected token: " + strToken(colon) + ", expected ':'"; if (state.tolerant) { state.warnings.push({         message: message,          line: colon.line,        });

state.pos -= 1; } else { var err = new SyntaxError(message); err.line = colon.line; throw err; }   }  }

function skipPunctuation(tokens, state, valid) { var punctuation = [",", ":", "]", "}"]; var token = popToken(tokens, state); while (true) { // eslint-disable-line no-constant-condition if (valid && valid.indexOf(token.type) !== -1) { return token; } else if (token.type === "eof") { return token; } else if (punctuation.indexOf(token.type) !== -1) { var message = "Unexpected token: " + strToken(token) + ", expected '[', '{', number, string or atom"; if (state.tolerant) { state.warnings.push({           message: message,            line: token.line,          }); token = popToken(tokens, state); } else { var err = new SyntaxError(message); err.line = token.line; throw err; }     } else { return token; }   }  }

function raiseError(state, token, message) { if (state.tolerant) { state.warnings.push({       message: message,        line: token.line,      }); } else { var err = new SyntaxError(message); err.line = token.line; throw err; } }

function raiseUnexpected(state, token, expected) { raiseError(state, token, "Unexpected token: " + strToken(token) + ", expected " + expected); }

function checkDuplicates(state, obj, token) { var key = token.value;

if (state.duplicate && Object.prototype.hasOwnProperty.call(obj, key)) { raiseError(state, token, "Duplicate key: " + key); } }

function appendPair(state, obj, key, value) { value = state.reviver ? state.reviver(key, value) : value; if (value !== undefined) { obj[key] = value; } }

function parsePair(tokens, state, obj) { var token = skipPunctuation(tokens, state, [":"]); var key; var value;

if (token.type !== "string") { raiseUnexpected(state, token, "string"); switch (token.type) { case ":": token = { type: "string", value: "null", line: token.line, };

state.pos -= 1; break;

case "number": case "atom": token = { type: "string", value: "" + token.value, line: token.line, };         break;

case "[": case "{": state.pos -= 1; value = parseAny(tokens, state); // eslint-disable-line no-use-before-define appendPair(state, obj, "null", value); return; // no default }   }

checkDuplicates(state, obj, token); key = token.value; skipColon(tokens, state); value = parseAny(tokens, state); // eslint-disable-line no-use-before-define

appendPair(state, obj, key, value); }

function parseElement(tokens, state, arr) { var key = arr.length; var value = parseAny(tokens, state); // eslint-disable-line no-use-before-define arr[key] = state.reviver ? state.reviver("" + key, value) : value; }

function parseObject(tokens, state) { return parseMany(tokens, state, {}, { // eslint-disable-line no-use-before-define     skip: [":", "}"],      elementParser: parsePair,      elementName: "string",      endSymbol: "}",    }); }

function parseArray(tokens, state) { return parseMany(tokens, state, [], { // eslint-disable-line no-use-before-define     skip: ["]"],      elementParser: parseElement,      elementName: "json object",      endSymbol: "]",    }); }

function parseMany(tokens, state, obj, opts) { var token = skipPunctuation(tokens, state, opts.skip);

if (token.type === "eof") { raiseUnexpected(state, token, "'" + opts.endSymbol + "' or " + opts.elementName);

token = { type: opts.endSymbol, line: token.line, };   }

switch (token.type) { case opts.endSymbol: return obj;

default: state.pos -= 1; // push the token back opts.elementParser(tokens, state, obj); break; }

// Rest while (true) { // eslint-disable-line no-constant-condition token = popToken(tokens, state);

if (token.type !== opts.endSymbol && token.type !== ",") { raiseUnexpected(state, token, "',' or '" + opts.endSymbol + "'");

token = { type: token.type === "eof" ? opts.endSymbol : ",", line: token.line, };

state.pos -= 1; }

switch (token.type) { case opts.endSymbol: return obj;

case ",": opts.elementParser(tokens, state, obj); break; // no default }   }  }

function endChecks(tokens, state, ret) { if (state.pos < tokens.length) { raiseError(state, tokens[state.pos],       "Unexpected token: " + strToken(tokens[state.pos]) + ", expected end-of-input"); }

// Throw error at the end if (state.tolerant && state.warnings.length !== 0) { var message = state.warnings.length === 1 ? state.warnings[0].message : state.warnings.length + " parse warnings"; var err = new SyntaxError(message); err.line = state.warnings[0].line; err.warnings = state.warnings; err.obj = ret; throw err; } }

function parseAny(tokens, state, end) { var token = skipPunctuation(tokens, state); var ret;

if (token.type === "eof") { raiseUnexpected(state, token, "json object"); }

switch (token.type) { case "{": ret = parseObject(tokens, state); break; case "[": ret = parseArray(tokens, state); break; case "string": case "number": case "atom": ret = token.value; break; // no default }

if (end) { ret = state.reviver ? state.reviver("", ret) : ret; endChecks(tokens, state, ret); }

return ret; }

function parse(text, opts) { if (typeof opts === "function" || opts === undefined) { return JSON.parse(transform(text), opts); } else if (new Object(opts) !== opts) { // eslint-disable-line no-new-object throw new TypeError("opts/reviver should be undefined, a function or an object"); }

opts.relaxed = opts.relaxed !== undefined ? opts.relaxed : true; opts.warnings = opts.warnings || opts.tolerant || false; opts.tolerant = opts.tolerant || false; opts.duplicate = opts.duplicate || false;

if (!opts.warnings && !opts.relaxed) { return JSON.parse(text, opts.reviver); }

var tokens = opts.relaxed ? lexer(text) : strictLexer(text);

if (opts.relaxed) { // Strip commas tokens = stripTrailingComma(tokens); }

if (opts.warnings) { // Strip whitespace tokens = tokens.filter(function (token) {       return token.type !== " ";      });

var state = { pos: 0, reviver: opts.reviver, tolerant: opts.tolerant, duplicate: opts.duplicate, warnings: [] }; return parseAny(tokens, state, true); } else { var newtext = tokens.reduce(function (str, token) {       return str + token.match;      }, "");

return JSON.parse(newtext, opts.reviver); } }

function stringifyPair(obj, key) { return JSON.stringify(key) + ":" + stringify(obj[key]); // eslint-disable-line no-use-before-define }

function stringify(obj) { switch (typeof obj) { case "string": case "number": case "boolean": return JSON.stringify(obj); // no default }   if (Array.isArray(obj)) { return "[" + obj.map(stringify).join(",") + "]"; }   if (new Object(obj) === obj) { // eslint-disable-line no-new-object var keys = Object.keys(obj); keys.sort; return "{" + keys.map(stringifyPair.bind(null, obj)) + "}"; }   return "null"; }

// Export stuff var RJSON = { transform: transform, parse: parse, stringify: stringify, };

/* global window, module */ if (typeof window !== "undefined") { window.RJSON = RJSON; } else if (typeof module !== "undefined") { module.exports = RJSON; } });