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| let tokenReg = { string: new RegExp("^(\"([^\"\\\\]|\\\\.)*\")"), number: new RegExp("^(-?\\d+(\\.\\d+)?)"), boolean: new RegExp("^(true|false)"), null: new RegExp("^(null)"), objectOpen: new RegExp("^(\\{)"), objectClose: new RegExp("^(\\})"), arrayOpen: new RegExp("^(\\[)"), arrayClose: new RegExp("^(\\])"), colon: new RegExp("^(\\:)"), split: new RegExp("^(\\,)"), space: new RegExp("^(\\s+)"), }
function getFirstToken(text, type) { if (!tokenReg[type].test(text)) { return null; } return { type, match: text.match(tokenReg[type])[1] }; }
function transString(text) { let val = ""; for (let i = 1; i < text.length - 1; i++) { if (text[i] != "\\") { val += text[i]; } else { switch (text[i + 1]) { case "n": val += "\n"; break; case "t": val += "\t"; break; default: val += text[i + 1]; break; } i++; } } return val; }
function parseTokens(tokens, index) { switch (tokens[index].type) { case "objectOpen": { index++; let obj = {}; while (tokens[index].type != "objectClose") { if (tokens[index].type == "string" && tokens[index + 1].type == "colon") { let item = parseTokens(tokens, index + 2); obj[transString(tokens[index].match)] = item.data; index = item.nextIndex; if (tokens[index].type == 'split') { index++; } } else { throw new Error(); } } return { nextIndex: index + 1, data: obj }; } case "arrayOpen": { index++; let obj = []; while (tokens[index].type != "arrayClose") { let item = parseTokens(tokens, index); obj.push(item.data); index = item.nextIndex; if (tokens[index].type == 'split') { index++; } } return { nextIndex: index + 1, data: obj };
} case "string": { return { nextIndex: index + 1, data: transString(tokens[index].match) }; } case "number": { return { nextIndex: index + 1, data: Number(tokens[index].match) }; } case "boolean": { return { nextIndex: index + 1, data: Boolean(tokens[index].match) }; } case "null": { return { nextIndex: index + 1, data: null }; } default: throw new Error(); } }
function formatTokens(tokens) { let format = ""; let deepth = 0; const enter = (dp) => format += "\n" + " ".repeat(dp); for (let item of tokens) { if (item.type == 'objectClose' || item.type == 'arrayClose') { enter(--deepth); } format += item.match; if (item.type == 'objectOpen' || item.type == 'arrayOpen') { enter(++deepth); } if (item.type == 'split') { enter(deepth); } if (item.type == 'value') { format += " "; } } return format; }
function parseText(text) { let tokens = []; while (text) { let item for (let k in tokenReg) { item = getFirstToken(text, k); if (item) { break; } } tokens.push(item); text = text.substring(item.match.length); } tokens = tokens.filter(o => o.type != "space"); console.log(formatTokens(tokens)); return parseTokens(tokens, 0).data; }
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