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<html lang="es">>
<head>
<meta charset="UTF-8">
<title>Árbol de sintaxis abstracta</title>
</head>
<body>
<textarea cols="50" id="input" rows="10"></textarea><br>
<button onclick="buildTree()">Construir árbol</button>
<br>
<div id="output"></div>
<script>
// ast_to_json
// Vlad Trushin
// Estos son los tipos de token y nodos del árbol de sintaxis abstracta Javascript-Ecmascript ya construido:
const tokenTypeUnkKnown = 'Token desconocido';
const tokenTypeLineComent = 'Comentario de línea';
const tokenTypeBlockComent = 'Comentario de bloque';
const tokenTypeSimpleQuotes = 'Comillas simples';
const tokenTypeDoubleQuotes = 'Comillas dobles';
const tokenTypeFrenchQuotes = 'Comillas francesas';
const tokenTypeBrackets = 'Corchetes';
const tokenTypeBraces = 'Llaves';
const tokenTypeParenthesis = 'Paréntesis';
const tokenTypeOperator = 'Operador';
const tokenTypeReservedWord = 'Palabra reservada';
const tokenTypeSymbol = 'Símbolo';
const tokenTypeIdentifier = 'Identificador';
// Categorías de nodos en un árbol de sintáxsis abstracta
const tokenCathegoryOpener = 'node opener';
const tokenCathegoryCloser = 'node closer';
const tokenCathegorySymbol = 'node symbol';
const tokenCathegoryOperator = 'node operator';
const tokenCathegoryReservedWord = 'node reserved word';
const tokenCathegoryExpression = 'node expression';
// Conjuntos de caracteres (Se utiliza en sub-clases).
const characterSetConsonantes = [
'b', 'c', 'd', 'f', 'g', 'h', 'j', 'k', 'l', 'm', 'n', 'ñ', 'p', 'q', 'r', 's', 't', 'v', 'x', 'y', 'z', 'B', 'C', 'D', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'Ñ', 'P', 'Q', 'R', 'S', 'T', 'V', 'X', 'Y', 'Z',
];
const characterSetVocales = [
'a', 'e', 'i', 'o', 'u', 'á', 'é', 'í', 'ó', 'ú', 'ü', 'A', 'E', 'I', 'O', 'U', 'Á', 'É', 'Í', 'Ó', 'Ú', 'Ü',
];
const characterDigits = [
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
];
const tokens = [
{symbol: '(', type: tokenTypeParenthesis, cathegory: tokenCathegoryOpener},
{symbol: '{', type: tokenTypeBlockComent, cathegory: tokenCathegoryOpener},
{symbol: '[', type: tokenTypeBrackets, cathegory: tokenCathegoryOpener},
{symbol: '"', type: tokenTypeDoubleQuotes, cathegory: tokenCathegoryOpener},
{symbol: '\'', type: tokenTypeSimpleQuotes, cathegory: tokenCathegoryOpener},
{symbol: '`', type: tokenTypeFrenchQuotes, cathegory: tokenCathegoryOpener},
{symbol: ')', type: tokenTypeParenthesis, cathegory: tokenCathegoryCloser},
{symbol: '}', type: tokenTypeBlockComent, cathegory: tokenCathegoryCloser},
{symbol: ']', type: tokenTypeBrackets, cathegory: tokenCathegoryCloser},
{symbol: '"', type: tokenTypeDoubleQuotes, cathegory: tokenCathegoryCloser},
{symbol: '\'', type: tokenTypeSimpleQuotes, cathegory: tokenCathegoryCloser},
{symbol: '`', type: tokenTypeFrenchQuotes, cathegory: tokenCathegoryCloser},
{symbol: '/', type: tokenTypeSymbol, cathegory: tokenCathegoryCloser},
{symbol: ';', type: tokenTypeSymbol, cathegory: tokenCathegorySymbol},
{symbol: '.', type: tokenTypeSymbol, cathegory: tokenCathegorySymbol},
{symbol: '@', type: tokenTypeSymbol, cathegory: tokenCathegorySymbol},
{symbol: '#', type: tokenTypeSymbol, cathegory: tokenCathegorySymbol},
{symbol: '$', type: tokenTypeSymbol, cathegory: tokenCathegorySymbol},
{symbol: '%', type: tokenTypeSymbol, cathegory: tokenCathegorySymbol},
{symbol: '^', type: tokenTypeSymbol, cathegory: tokenCathegorySymbol},
{symbol: '&', type: tokenTypeSymbol, cathegory: tokenCathegorySymbol},
{symbol: '*', type: tokenTypeSymbol, cathegory: tokenCathegorySymbol},
{symbol: '~', type: tokenTypeSymbol, cathegory: tokenCathegorySymbol},
{symbol: ':', type: tokenTypeSymbol, cathegory: tokenCathegorySymbol},
{symbol: '{', type: tokenTypeBraces, cathegory: tokenCathegorySymbol},
{symbol: '}', type: tokenTypeBraces, cathegory: tokenCathegorySymbol},
{symbol: '=', type: tokenTypeSymbol, cathegory: tokenCathegorySymbol},
{symbol: '[', type: tokenTypeBrackets, cathegory: tokenCathegorySymbol},
{symbol: ']', type: tokenTypeBrackets, cathegory: tokenCathegorySymbol},
{symbol: ',', type: tokenTypeSymbol, cathegory: tokenCathegorySymbol},
{symbol: '>', type: tokenTypeSymbol, cathegory: tokenCathegorySymbol},
{symbol: '<', type: tokenTypeSymbol, cathegory: tokenCathegorySymbol},
{symbol: 'instanceof', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: 'typeof', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '>>>=', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '>>>', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '>>=', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '<>=', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '===', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '!==', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '<=', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '>=', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '&&', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '||', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '++', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '--', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '+=', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '-=', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '*=', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '/=', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '%=', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '^=', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '&=', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '!=', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '|=', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '&', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '|', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '^', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '<', type: tokenTypeSymbol, cathegory: tokenCathegoryOperator},
{symbol: '>', type: tokenTypeSymbol, cathegory: tokenCathegoryOperator},
{symbol: '!', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '~', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '+', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '-', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '*', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '/', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: '%', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{symbol: ';', type: tokenTypeSymbol, cathegory: tokenCathegoryOperator},
{symbol: ',', type: tokenTypeSymbol, cathegory: tokenCathegoryOperator},
{symbol: '=>', type: tokenTypeOperator, cathegory: tokenCathegoryOperator},
{
symbol: 'break',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'case',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'catch',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'class',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'const',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'continue',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'debugger',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'default',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'delete',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'do',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'else',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'enum',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'export',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'extends',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'false',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'finally',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'for',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'function',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'if',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'implements',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'import',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'in',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'instanceof',
type: tokenTypeOperator,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'interface',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'let',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'new',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'null',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'package',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'private',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'protected',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'public',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'return',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'static',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'super',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'switch',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'this',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'throw',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'true',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'try',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'typeof',
type: tokenTypeOperator,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'var',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'void',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'while',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'with',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
{
symbol: 'yield',
type: tokenTypeReservedWord,
cathegory: tokenCathegoryReservedWord,
},
];
function extractSubstring(originalString, startPosition, numberOfCharacters) {
let result;
if (startPosition < 0 || startPosition >= originalString.length || numberOfCharacters <= 0) { // La posición inicial está fuera de los límites de la cadena o no se pidió extraer ningún elemento
result = '';
} else {
if (startPosition + numberOfCharacters > originalString.length) { // No es posible extraer n elementos a partir de la posición start
numberOfCharacters = originalString.length - startPosition;
}
result = String(originalString).substr(startPosition, numberOfCharacters);
}
return result;
}
function obtenerTokensDuplicados(chart, caracteres = 1) {
const duplicados = [];
const map = {};
chart.forEach((e, i) => {
let nombre = extractSubstring(e.symbol, 0, caracteres);
if (map[nombre] === 1) {
duplicados.push(nombre);
}
map[nombre] = (map[nombre] || 0) + 1;
});
return duplicados;
}
// Los índices de estos dos deben corresponderse, agrupar en una sola estructura...
const classOpeners = tokens.filter(el => el.cathegory === tokenCathegoryOpener).map(el => el.symbol); // ['(', '{', '[', '"', '\'', '`', '/'];
const classClosers = tokens.filter(el => el.cathegory === tokenCathegoryCloser).map(el => el.symbol); // [')', '}', ']', '"', '\'', '`', '/'];
const classSymbols = tokens.filter(el => el.cathegory === tokenCathegorySymbol).map(el => el.symbol); // [';', '.', '@', '#', '$', '%', '^', '&', '*', '~', ':', '{', '}', '=', '[', ']', ',', '>', '<'];
const classOperators = tokens.filter(el => el.cathegory === tokenCathegoryOperator).map(el => el.symbol); // ['instanceof', 'typeof', '>>>=', '>>>', '>>=', '<>=', '===', '!==', '<=', '>=', '&&', '||', '++', '--', '+=', '-=', '*=', '/=', '%=', '^=', '&=', '!=', '|=', '&', '|', '^', '<', '>', '!', '~', '+', '-', '*', '/', '%', ';', ',', '=>'];
// Sintactical analizer (next to where the operator in position ends).
const syntaxCheck = (cadena, posicion) => {
if (posicion === -1 || posicion >= cadena.length) {
return false;
}
const pairs = {
'(': ')',
'{': '}',
'[': ']',
'\'': true,
'"': true,
'`': true,
};
if (cadena.substring(posicion, posicion + 2) === '//') {
const endComment = cadena.indexOf('\n', posicion + 2);
return (endComment === -1) ? cadena.length + 1 : endComment + 1;
} else if (cadena.substring(posicion, posicion + 2) === '/*') {
const endComment = cadena.indexOf('*/', posicion);
return (endComment === -1) ? -1 : endComment + 2;
} else {
let nextPosition = posicion;
const currentChar = cadena[posicion];
if (currentChar in pairs) {
if (pairs[currentChar] === true) {
nextPosition = cadena.indexOf(currentChar, nextPosition + 1);
} else {
nextPosition = cadena.indexOf(pairs[currentChar], nextPosition + 1);
}
} else {
for (let i = 0; i < pairs.length; i++) {
const start = pairs[i];
if (cadena.substring(posicion, posicion + start.length) === start) {
nextPosition = posicion + start.length;
for (let j = nextPosition; j < cadena.length; j++) {
const end = pairs[start];
if (cadena.substring(j, j + end.length) === end) {
nextPosition = j + end.length;
break;
} else if (pairs[cadena[j]]) {
j = syntaxCheck(cadena, j) - 1;
if (j === -2) {
return -1;
}
nextPosition = j + 1;
}
}
break;
}
}
}
return (nextPosition >= cadena.length) ? -1 : nextPosition;
}
};
function genericParse(v, options = {
functionCallback: null,
variableCallback: null,
}) {
const result = [];
let token = '';
let nodeEnd = 0;
const pushToken = (type = tokenTypeUnkKnown) => {
const tmp = token.trim();
token = '';
const tok = {source: tmp, content: tmp, type: type};
if (tok.type === tokenTypeBraces || tok.type === tokenTypeBrackets || tok.type === tokenTypeParenthesis || tok.type === tokenTypeSimpleQuotes || tok.type === tokenTypeDoubleQuotes || tok.type === tokenTypeFrenchQuotes) {
tok.content = tmp.substring(1, tmp.length - 1);
if (tok.type === tokenTypeBraces || tok.type === tokenTypeBrackets || tok.type === tokenTypeParenthesis) {
tok.entry = genericParse(tmp.substring(1, tmp.length - 1));
}
} else if (tok.type === tokenTypeOperator) {
tok.content = tmp;
}
result.push(tok);
return tmp.length;
};
const typeAt = (so, p = 0, len = 1) => {
const chart = tokens.filter(
(el) =>
so.length > 0 &&
el.symbol[0] === so[0] &&
extractSubstring(el.symbol, 0, len) === extractSubstring(so, p, len),
);
if (chart.length === 0) {
return resultado;
}
if (classOperators.includes(so.substring(p, p + len))) {
if (chart.length === 1) {
resultado.tipo = tokenTypeOperator;
return resultado;
}
}
let str = extractSubstring(so, p, syntaxCheck(so, p) - p);
if (str) {
chart.forEach((posibility) => {
if (posibility.symbol === '/') {
if (p + 1 < str.length && (str[1] === '/' || tokens.filter((el) => el.symbol[0] === str[p + 1]).length > 0)) {
resultado.tipo = tokenTypeLineComent;
} else {
resultado.tipo = tokenTypeBlockComent;
}
} else {
let tokenApertura = classOpeners.findIndex((el) => el.symbol[0] === str[0]);
let tokenCierra = classClosers.findIndex((el) => el.symbol[0] === str[str.length - 1]);
if (tokenApertura !== -1 && tokenApertura === tokenCierra) {
resultado.tipo = classOpeners[tokenApertura].type;
}
}
});
}
return resultado;
};
// First pass, generic parse
while (nodeEnd < v.length) {
const nodeBegin = nodeEnd;
nodeEnd = syntaxCheck(v, nodeEnd);
if (nodeEnd !== -1 && nodeEnd > nodeBegin + 1 && classOpeners.includes(v[nodeBegin]) && classClosers.includes(v[nodeEnd - 1])) {
if (token !== '') {
pushToken(typeAt(token));
}
pushToken(typeAt(v, nodeBegin, nodeEnd - nodeBegin));
} else {
token += v[nodeBegin];
if (typeAt(token).tipo === tokenTypeOperator) {
pushToken(typeAt(token));
}
}
nodeEnd++;
}
if (token.trim() !== '') {
pushToken();
}
// Second pass, specific parse
if (options.functionCallback || options.variableCallback) {
result.forEach((tok, i) => {
if (tok.type === tokenTypeVariable && options.variableCallback) {
result[i] = options.variableCallback(tok);
} else if (tok.type === tokenTypeFunction && options.functionCallback) {
result[i] = options.functionCallback(tok);
}
});
}
return result;
}
// Para probar
console.log(genericParse('1+2+3+4+sum(1,2,3)+avg(1+1+2+3+4)+apellidos("Luis Guillermo Bultet " + `Ibles`, 1+1)'));
// Faltan los operadores, símbolos y palabras reservadas.
// Recuerda probar con objetos, vacíos, es decir, {}, (), [] porsia pero debe parsear bien... allá por la línea 145.
class SimpleParse {
/**
* Constructor de la clase Parse.
*
* @param {Object} instrucciones Un objeto que define las instrucciones válidas y sus formatos de argumentos.
*/
constructor(instrucciones = []) {
this.instrucciones = instrucciones;
}
/**
* Analiza el código fuente y devuelve una lista de instrucciones.
*
* @param {string} codigo El código fuente a analizar.
* @returns {Array} Una lista de objetos que representan las instrucciones en el código.
* @throws {Error} Si el código contiene una instrucción inválida.
*/
parsear(codigo) {
// Separar el código en líneas
const lineas = codigo.trim().split('\n');
// Crear una lista de instrucciones
const instrucciones = [];
for (let i = 0; i < lineas.length; i++) {
// Eliminar los espacios en blanco al principio y al final de la línea
const linea = lineas[i].trim();
// Si la línea está en blanco o es un comentario, ignorarla
if (linea === '' || linea.startsWith('//')) {
continue;
}
// Separar la línea en sus componentes
const componentes = linea.split(/[\s,]+/);
// Obtener el código de operación y los argumentos
const op = componentes[0];
const args = componentes.slice(1);
// Crear un objeto que representa la instrucción y agregarlo a la lista
instrucciones.push({
op: op,
args: args,
});
}
// Verificar que las instrucciones sean válidas
// for (let i = 0; i < instrucciones.length; i++) {
// const instruccion = instrucciones[i];
// if (!this.instrucciones.hasOwnProperty(instruccion.op)) {
// throw new Error(`Instrucción inválida: ${instruccion.op}`);
// }
// }
// Devolver la lista de instrucciones
return instrucciones;
}
}
class AnothnerParser {
constructor(input) {
this.input = input;
this.pos = 0;
}
getNextToken() {
while (this.pos < this.input.length && this.input[this.pos] === ' ') {
this.pos++;
}
if (this.pos >= this.input.length) {
return null;
}
const char = this.input[this.pos];
if (char === '+' || char === '-') {
this.pos++;
return char;
}
if (/\d/.test(char)) {
let num = '';
while (this.pos < this.input.length && /\d/.test(this.input[this.pos])) {
num += this.input[this.pos];
this.pos++;
}
return parseInt(num);
}
throw new Error(`Unexpected character ${char} at position ${this.pos}`);
}
parseNumber() {
const value = this.getNextToken();
return {type: 'Number', value};
}
parseFactor() {
const token = this.getNextToken();
if (typeof token === 'number') {
return {type: 'Number', value: token};
}
if (token === '(') {
const node = this.parseExpression();
if (this.getNextToken() !== ')') {
throw new Error(`Expected ')' at position ${this.pos}`);
}
return node;
}
throw new Error(`Unexpected token ${token} at position ${this.pos}`);
}
parseTerm() {
let node = this.parseFactor();
while (this.input[this.pos] === '*' || this.input[this.pos] === '/') {
const operator = this.getNextToken();
const right = this.parseFactor();
node = {
tipo: operator,
left: node,
right: right,
};
}
return node;
}
parseExpression() {
let node = this.parseTerm();
while (this.input[this.pos] === '+' || this.input[this.pos] === '-') {
const operator = this.getNextToken();
const right = this.parseTerm();
node = {
tipo: operator,
left: node,
right: right,
};
}
return node;
}
parse() {
return this.parseExpression();
}
}
class Parser3 {
constructor(input) {
this.input = input;
this.pos = 0;
}
getNextToken() {
// Implementa aquí la lógica para obtener el siguiente token
}
parseNumber() {
// Implementa aquí la lógica para parsear un número y devolver un nodo del árbol AST
}
parseFactor() {
// Implementa aquí la lógica para parsear un factor y devolver un nodo del árbol AST
}
parseTerm() {
// Implementa aquí la lógica para parsear un término y devolver un nodo del árbol AST
}
parseExpression() {
let node = this.parseTerm();
while (this.input[this.pos] === '+' || this.input[this.pos] === '-') {
const operator = this.getNextToken();
const right = this.parseTerm();
node = {
type: operator,
left: node,
right: right,
};
}
return node;
}
parse() {
return this.parseExpression();
}
}
class Parser4 {
constructor(input) {
this.input = input;
this.pos = 0;
}
getNextToken() {
while (this.pos < this.input.length && this.input[this.pos] === ' ') {
this.pos++;
}
if (this.pos >= this.input.length) {
return null;
}
const char = this.input[this.pos];
if (char === '+' || char === '-') {
this.pos++;
return char;
}
if (/\d/.test(char)) {
let num = '';
while (this.pos < this.input.length && /\d/.test(this.input[this.pos])) {
num += this.input[this.pos];
this.pos++;
}
return parseInt(num);
}
throw new Error(`Unexpected character ${char} at position ${this.pos}`);
}
parseNumber() {
const value = this.getNextToken();
return {type: 'Number', value};
}
parseFactor() {
const token = this.getNextToken();
if (typeof token === 'number') {
return {type: 'Number', value: token};
}
if (token === '(') {
const node = this.parseExpression();
if (this.getNextToken() !== ')') {
throw new Error(`Expected ')' at position ${this.pos}`);
}
return node;
}
throw new Error(`Unexpected token ${token} at position ${this.pos}`);
}
parseTerm() {
let node = this.parseFactor();
while (this.input[this.pos] === '*' || this.input[this.pos] === '/') {
const operator = this.getNextToken();
const right = this.parseFactor();
node = {
tipo: operator,
left: node,
right: right,
};
}
return node;
}
parseExpression() {
let node = this.parseTerm();
while (this.input[this.pos] === '+' || this.input[this.pos] === '-') {
const operator = this.getNextToken();
const right = this.parseTerm();
node = {
tipo: operator,
left: node,
right: right,
};
}
return node;
}
parse() {
return this.parseExpression();
}
}
function buildTree() {
const input = document.getElementById('input').value;
const tree = Parser3(input);
document.getElementById('output').innerHTML = JSON.stringify(tree, null, 2);
}
</script>
</body>
</html>