@dillonkearns/elm-graphql/examples/src/subscription/node_modules/graphql/error/syntaxError.js

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'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.syntaxError = syntaxError;

var _location = require('../language/location');

var _GraphQLError = require('./GraphQLError');

/**
 * Produces a GraphQLError representing a syntax error, containing useful
 * descriptive information about the syntax error's position in the source.
 */
/**
 * Copyright (c) 2015-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * 
 */

function syntaxError(source, position, description) {
  var location = (0, _location.getLocation)(source, position);
  var line = location.line + source.locationOffset.line - 1;
  var columnOffset = getColumnOffset(source, location);
  var column = location.column + columnOffset;
  var error = new _GraphQLError.GraphQLError('Syntax Error ' + source.name + ' (' + line + ':' + column + ') ' + description + '\n\n' + highlightSourceAtLocation(source, location), undefined, source, [position]);
  return error;
}

/**
 * Render a helpful description of the location of the error in the GraphQL
 * Source document.
 */
function highlightSourceAtLocation(source, location) {
  var line = location.line;
  var lineOffset = source.locationOffset.line - 1;
  var columnOffset = getColumnOffset(source, location);
  var contextLine = line + lineOffset;
  var prevLineNum = (contextLine - 1).toString();
  var lineNum = contextLine.toString();
  var nextLineNum = (contextLine + 1).toString();
  var padLen = nextLineNum.length;
  var lines = source.body.split(/\r\n|[\n\r]/g);
  lines[0] = whitespace(source.locationOffset.column - 1) + lines[0];
  return (line >= 2 ? lpad(padLen, prevLineNum) + ': ' + lines[line - 2] + '\n' : '') + lpad(padLen, lineNum) + ': ' + lines[line - 1] + '\n' + whitespace(2 + padLen + location.column - 1 + columnOffset) + '^\n' + (line < lines.length ? lpad(padLen, nextLineNum) + ': ' + lines[line] + '\n' : '');
}

function getColumnOffset(source, location) {
  return location.line === 1 ? source.locationOffset.column - 1 : 0;
}

function whitespace(len) {
  return Array(len + 1).join(' ');
}

function lpad(len, str) {
  return whitespace(len - str.length) + str;
}