356 lines
11 KiB
JavaScript
356 lines
11 KiB
JavaScript
/*
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* October CMS JSON Parser
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*/
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"use strict";
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(function() {
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/**
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* parse key
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* @param str
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* @param pos
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* @param quote
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* @returns {string}
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*/
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function parseKey(str, pos, quote) {
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var key = "";
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for (var i = pos; i < str.length; i++) {
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if (quote && quote === str[i]) {
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return key;
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} else if (!quote && (str[i] === " " || str[i] === ":")) {
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return key;
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}
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key += str[i];
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if (str[i] === "\\" && i + 1 < str.length) {
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key += str[i + 1];
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i++;
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}
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}
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throw new Error("Broken JSON syntax near " + key);
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}
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/*
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* get body
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* @param str
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* @param pos
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* @returns {*}
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*/
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function getBody(str, pos) {
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// parse string body
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if (str[pos] === "\"" || str[pos] === "'") {
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var body = str[pos];
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for (var i = pos + 1; i < str.length; i++) {
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if (str[i] === "\\") {
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body += str[i];
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if (i + 1 < str.length) body += str[i + 1];
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i++;
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} else if (str[i] === str[pos]) {
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body += str[pos];
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return {
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originLength: body.length,
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body: body
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};
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} else body += str[i];
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}
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throw new Error("Broken JSON string body near " + body);
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}
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// parse true / false
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if (str[pos] === "t") {
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if (str.indexOf("true", pos) === pos) {
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return {
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originLength: "true".length,
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body: "true"
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};
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}
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throw new Error("Broken JSON boolean body near " + str.substr(0, pos + 10));
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}
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if (str[pos] === "f") {
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if (str.indexOf("f", pos) === pos) {
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return {
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originLength: "false".length,
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body: "false"
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};
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}
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throw new Error("Broken JSON boolean body near " + str.substr(0, pos + 10));
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}
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// parse null
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if (str[pos] === "n") {
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if (str.indexOf("null", pos) === pos) {
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return {
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originLength: "null".length,
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body: "null"
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};
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}
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throw new Error("Broken JSON boolean body near " + str.substr(0, pos + 10));
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}
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// parse number
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if (str[pos] === "-" || str[pos] === "+" || str[pos] === "." || (str[pos] >= "0" && str[pos] <= "9")) {
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var body = "";
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for (var i = pos; i < str.length; i++) {
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if (str[i] === "-" || str[i] === "+" || str[i] === "." || (str[i] >= "0" && str[i] <= "9")) {
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body += str[i];
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} else {
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return {
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originLength: body.length,
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body: body
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};
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}
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}
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throw new Error("Broken JSON number body near " + body);
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}
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// parse object
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if (str[pos] === "{" || str[pos] === "[") {
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var stack = [str[pos]];
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var body = str[pos];
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for (var i = pos + 1; i < str.length; i++) {
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body += str[i];
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if (str[i] === "\\") {
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if (i + 1 < str.length) body += str[i + 1];
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i++;
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} else if (str[i] === "\"") {
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if (stack[stack.length - 1] === "\"") {
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stack.pop();
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} else if (stack[stack.length - 1] !== "'") {
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stack.push(str[i]);
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}
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} else if (str[i] === "'") {
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if (stack[stack.length - 1] === "'") {
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stack.pop();
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} else if (stack[stack.length - 1] !== "\"") {
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stack.push(str[i]);
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}
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} else if (stack[stack.length - 1] !== "\"" && stack[stack.length - 1] !== "'") {
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if (str[i] === "{") {
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stack.push("{");
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} else if (str[i] === "}") {
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if (stack[stack.length - 1] === "{") {
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stack.pop();
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} else {
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throw new Error("Broken JSON " + (str[pos] === "{" ? "object" : "array") + " body near " + body);
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}
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} else if (str[i] === "[") {
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stack.push("[");
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} else if (str[i] === "]") {
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if (stack[stack.length - 1] === "[") {
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stack.pop();
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} else {
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throw new Error("Broken JSON " + (str[pos] === "{" ? "object" : "array") + " body near " + body);
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}
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}
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}
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if (!stack.length) {
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return {
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originLength: i - pos,
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body: body
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};
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}
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}
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throw new Error("Broken JSON " + (str[pos] === "{" ? "object" : "array") + " body near " + body);
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}
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throw new Error("Broken JSON body near " + str.substr((pos - 5 >= 0) ? pos - 5 : 0, 50));
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}
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/*
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* This is a char can be key head
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* @param ch
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* @returns {boolean}
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*/
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function canBeKeyHead(ch) {
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if (ch[0] === "\\") return false;
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if ((ch[0] >= 'a' && ch[0] <= 'z') || (ch[0] >= 'A' && ch[0] <= 'Z') || ch[0] === '_') return true;
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if (ch[0] >= '0' && ch[0] <= '9') return true;
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if (ch[0] === '$') return true;
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if (ch.charCodeAt(0) > 255) return true;
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return false;
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}
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function isBlankChar(ch) {
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return ch === " " || ch === "\n" || ch === "\t";
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}
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/*
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* parse JSON
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* @param str
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*/
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function parse(str) {
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str = str.trim();
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if (!str.length) throw new Error("Broken JSON object.");
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var result = "";
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/*
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* the mistake ','
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*/
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while (str && str[0] === ",") {
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str = str.substr(1);
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}
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/*
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* string
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*/
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if (str[0] === "\"" || str[0] === "'") {
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if (str[str.length - 1] !== str[0]) {
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throw new Error("Invalid string JSON object.");
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}
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var body = "\"";
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for (var i = 1; i < str.length; i++) {
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if (str[i] === "\\") {
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if (str[i + 1] === "'") {
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body += str[i + 1]
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} else {
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body += str[i];
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body += str[i + 1];
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}
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i++;
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} else if (str[i] === str[0]) {
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body += "\"";
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return body
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} else if (str[i] === "\"") {
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body += "\\\""
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} else body += str[i];
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}
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throw new Error("Invalid string JSON object.");
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}
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/*
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* boolean
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*/
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if (str === "true" || str === "false") {
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return str;
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}
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/*
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* null
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*/
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if (str === "null") {
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return "null";
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}
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/*
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* number
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*/
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var num = parseFloat(str);
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if (!isNaN(num)) {
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return num.toString();
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}
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/*
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* object
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*/
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if (str[0] === "{") {
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var type = "needKey";
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var result = "{";
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for (var i = 1; i < str.length; i++) {
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if (isBlankChar(str[i])) {
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continue;
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} else if (type === "needKey" && (str[i] === "\"" || str[i] === "'")) {
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var key = parseKey(str, i + 1, str[i]);
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result += "\"" + key + "\"";
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i += key.length;
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i += 1;
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type = "afterKey";
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} else if (type === "needKey" && canBeKeyHead(str[i])) {
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var key = parseKey(str, i);
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result += "\"";
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result += key;
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result += "\"";
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i += key.length - 1;
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type = "afterKey";
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} else if (type === "afterKey" && str[i] === ":") {
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result += ":";
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type = ":";
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} else if (type === ":") {
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var body = getBody(str, i);
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i = i + body.originLength - 1;
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result += parse(body.body);
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type = "afterBody";
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} else if (type === "afterBody" || type === "needKey") {
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var last = i;
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while (str[last] === "," || isBlankChar(str[last])) {
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last++;
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}
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if (str[last] === "}" && last === str.length - 1) {
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while (result[result.length - 1] === ",") {
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result = result.substr(0, result.length - 1);
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}
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result += "}";
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return result;
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} else if (last !== i && result !== "{") {
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result += ",";
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type = "needKey";
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i = last - 1;
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}
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}
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}
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throw new Error("Broken JSON object near " + result);
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}
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/*
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* array
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*/
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if (str[0] === "[") {
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var result = "[";
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var type = "needBody";
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for (var i = 1; i < str.length; i++) {
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if (" " === str[i] || "\n" === str[i] || "\t" === str[i]) {
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continue;
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} else if (type === "needBody") {
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if (str[i] === ",") {
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result += "null,";
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continue;
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}
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if (str[i] === "]" && i === str.length - 1) {
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if (result[result.length - 1] === ",") result = result.substr(0, result.length - 1);
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result += "]";
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return result;
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}
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var body = getBody(str, i);
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i = i + body.originLength - 1;
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result += parse(body.body);
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type = "afterBody";
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} else if (type === "afterBody") {
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if (str[i] === ",") {
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result += ",";
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type = "needBody";
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// deal with mistake ","
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while (str[i + 1] === "," || isBlankChar(str[i + 1])) {
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if (str[i + 1] === ",") result += "null,";
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i++;
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}
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} else if (str[i] === "]" && i === str.length - 1) {
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result += "]";
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return result;
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}
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}
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}
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throw new Error("Broken JSON array near " + result);
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}
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}
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/*
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* parse October JSON string into JSON object
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* @param json
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* @returns {*}
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*/
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if ($.oc === undefined)
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$.oc = {}
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$.oc.JSON = function(json) {
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var jsonString = parse(json);
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return JSON.parse(jsonString);
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};
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})();
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