handlebars/dist/amd/handlebars/exception.js

Handlebars provides the power necessary to let you build semantic templates effectively with no frustration

define(['exports', 'module'], function (exports, module) {
  'use strict';

  var errorProps = ['description', 'fileName', 'lineNumber', 'endLineNumber', 'message', 'name', 'number', 'stack'];

  function Exception(message, node) {
    var loc = node && node.loc,
        line = undefined,
        endLineNumber = undefined,
        column = undefined,
        endColumn = undefined;

    // Hand-built ASTs may carry a partial loc; never let the location
    // bookkeeping mask the actual error message.
    if (loc && loc.start) {
      line = loc.start.line;
      column = loc.start.column;
      if (loc.end) {
        endLineNumber = loc.end.line;
        endColumn = loc.end.column;
      }

      message += ' - ' + line + ':' + column;
    }

    var tmp = Error.prototype.constructor.call(this, message);

    // Unfortunately errors are not enumerable in Chrome (at least), so `for prop in tmp` doesn't work.
    for (var idx = 0; idx < errorProps.length; idx++) {
      this[errorProps[idx]] = tmp[errorProps[idx]];
    }

    /* istanbul ignore else */
    if (Error.captureStackTrace) {
      Error.captureStackTrace(this, Exception);
    }

    try {
      if (loc) {
        this.lineNumber = line;
        this.endLineNumber = endLineNumber;

        // Work around issue under safari where we can't directly set the column value
        /* istanbul ignore next */
        if (Object.defineProperty) {
          Object.defineProperty(this, 'column', {
            value: column,
            enumerable: true
          });
          Object.defineProperty(this, 'endColumn', {
            value: endColumn,
            enumerable: true
          });
        } else {
          this.column = column;
          this.endColumn = endColumn;
        }
      }
    } catch (nop) {
      /* Ignore if the browser is very particular */
    }
  }

  Exception.prototype = new Error();

  module.exports = Exception;
});
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