canonical/node_modules/babel-types/lib/react.js

Canonical code style linter and formatter for JavaScript, SCSS, CSS and JSON.

/* @flow */

"use strict";

var _interopRequireWildcard = require("babel-runtime/helpers/interop-require-wildcard")["default"];

exports.__esModule = true;
exports.isCompatTag = isCompatTag;
exports.buildChildren = buildChildren;

var _index = require("./index");

var t = _interopRequireWildcard(_index);

var isReactComponent = t.buildMatchMemberExpression("React.Component");

exports.isReactComponent = isReactComponent;

function isCompatTag(tagName /*:: ?: string*/) /*: boolean*/ {
  return !!tagName && /^[a-z]|\-/.test(tagName);
}

function cleanJSXElementLiteralChild(child /*: { value: string }*/, args /*: Array<Object>*/) {
  var lines = child.value.split(/\r\n|\n|\r/);

  var lastNonEmptyLine = 0;

  for (var i = 0; i < lines.length; i++) {
    if (lines[i].match(/[^ \t]/)) {
      lastNonEmptyLine = i;
    }
  }

  var str = "";

  for (var i = 0; i < lines.length; i++) {
    var line = lines[i];

    var isFirstLine = i === 0;
    var isLastLine = i === lines.length - 1;
    var isLastNonEmptyLine = i === lastNonEmptyLine;

    // replace rendered whitespace tabs with spaces
    var trimmedLine = line.replace(/\t/g, " ");

    // trim whitespace touching a newline
    if (!isFirstLine) {
      trimmedLine = trimmedLine.replace(/^[ ]+/, "");
    }

    // trim whitespace touching an endline
    if (!isLastLine) {
      trimmedLine = trimmedLine.replace(/[ ]+$/, "");
    }

    if (trimmedLine) {
      if (!isLastNonEmptyLine) {
        trimmedLine += " ";
      }

      str += trimmedLine;
    }
  }

  if (str) args.push(t.stringLiteral(str));
}

function buildChildren(node /*: Object*/) /*: Array<Object>*/ {
  var elems = [];

  for (var i = 0; i < node.children.length; i++) {
    var child = node.children[i];

    if (t.isJSXText(child)) {
      cleanJSXElementLiteralChild(child, elems);
      continue;
    }

    if (t.isJSXExpressionContainer(child)) child = child.expression;
    if (t.isJSXEmptyExpression(child)) continue;

    elems.push(child);
  }

  return elems;
}