expand-value/dist/src/expression.mjs

Get deeply nested values from an object, like dot-prop and get-value, but with support for advanced features like bracket-notation and more.

var __defProp = Object.defineProperty;
var __name = (target, value) => __defProp(target, "name", { value, configurable: true });

// src/expression.ts
function parse(expression) {
  let pos = 0;
  function peek() {
    return expression[pos];
  }
  __name(peek, "peek");
  function consume() {
    return expression[pos++];
  }
  __name(consume, "consume");
  function skipWs() {
    while (pos < expression.length && /\s/.test(peek())) {
      pos++;
    }
  }
  __name(skipWs, "skipWs");
  function parseNum() {
    let n = "";
    while (pos < expression.length && /\d/.test(peek())) {
      n += consume();
    }
    return { type: "number", val: parseInt(n, 10) };
  }
  __name(parseNum, "parseNum");
  function parseIdent() {
    let id = "";
    while (pos < expression.length && /[\w$]/.test(peek())) {
      id += consume();
    }
    return id;
  }
  __name(parseIdent, "parseIdent");
  function parsePath() {
    const parts = [parseIdent()];
    while (peek() === ".") {
      consume();
      parts.push(parseIdent());
    }
    return { type: "path", parts };
  }
  __name(parsePath, "parsePath");
  function parsePrimary() {
    skipWs();
    const ch = peek();
    if (/\d/.test(ch)) {
      return parseNum();
    }
    if (/[\w$]/.test(ch)) {
      return parsePath();
    }
    if (ch === "(") {
      consume();
      const node = parseExpr();
      skipWs();
      if (peek() === ")") consume();
      return node;
    }
    return null;
  }
  __name(parsePrimary, "parsePrimary");
  function parseExpr() {
    let left = parsePrimary();
    while (true) {
      skipWs();
      const op = peek();
      if (op !== "+" && op !== "-") {
        break;
      }
      consume();
      const right = parsePrimary();
      left = { type: "binary", op, left, right };
    }
    return left;
  }
  __name(parseExpr, "parseExpr");
  return parseExpr();
}
__name(parse, "parse");
function evaluateExpression(node, data) {
  if (!node) return void 0;
  switch (node.type) {
    case "number": {
      return node.val;
    }
    case "path": {
      let val = data;
      for (const p of node.parts) {
        if (val == null) return void 0;
        val = val[p];
      }
      return val;
    }
    case "binary": {
      const l = evaluateExpression(node.left, data);
      const r = evaluateExpression(node.right, data);
      if (node.op === "+") return l + r;
      if (node.op === "-") return l - r;
      return void 0;
    }
    default: {
      return void 0;
    }
  }
}
__name(evaluateExpression, "evaluateExpression");
function evaluate(expression, data) {
  const ast = parse(expression);
  return evaluateExpression(ast, data);
}
__name(evaluate, "evaluate");
export {
  evaluate
};
//# sourceMappingURL=expression.mjs.map