"use strict";

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

var _lodash = require("lodash");

var _lodash2 = _interopRequireDefault(_lodash);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
 * Finds comments, both CSS comments and double slash ones, in a CSS string
 * This helper exists because PostCSS drops some inline comments (those
 * between seelctors, property values, etc.)
 * https://github.com/postcss/postcss/issues/845#issuecomment-232306259
 *
 * @param [string] rawString -- the source raw CSS string
 * @return [array] array of objects with these props:
 *    � type -- "css" or "double-slash"
 *    � source: { start, end }
 *      IMPORTANT: the function itself considers \r as a character, and counts
 *      it for `start` and `end`. But if their values are passed to PostCSS's
 *      result.warn(), than "\r\n" is consideren ONE CHAR (newline)!
 *    � raws
 *      raws.startToken -- `/*`, `/**`, `/**!`, etc.
 *      raws.left -- whitespace after the comment opening marker
 *      raws.text -- the full comment, including markers (//, /*)
 *      raws.right -- whitespace before the comment closing marker
 *      raws.endToken -- `*\/`, `**\/` for CSS comments
 *    � text -- the comment text only, excluding //, /*, trailing whitespaces
 *    � inlineAfter -- true, if there is something before the comment on
 *      the same line
 *    � inlineBefore -- true, if there is something after the comment on
 *      the same line
 */

function findCommentsInRaws(rawString) {
  var result = [];
  var comment = {};
  // Keeps track of which structure the parser is inside (string, comment,
  // url function, parens). E.g., /* comment */ inside a string doesn't
  // constitute a comment, so as url(//path)
  var modesEntered = [{
    mode: "normal",
    character: null
  }];
  var commentStart = null;

  // postcss-scss transforms //-comments into CSS comments, like so:
  // `// comment` -> `/* comment*/`. So to have a correct intex we need to
  // keep track on the added `*/` sequences
  var offset = 0;

  for (var i = 0; i < rawString.length; i++) {
    var character = rawString[i];
    var prevChar = i > 0 ? rawString[i - 1] : null;
    var nextChar = i + 1 < rawString.length ? rawString[i + 1] : null;

    var lastModeIndex = modesEntered.length - 1;
    var mode = modesEntered[lastModeIndex].mode;

    switch (character) {
      // If entering/exiting a string
      case '"':
      case "'":
        {
          if (mode === "comment") {
            break;
          }
          if (mode === "string" && modesEntered[lastModeIndex].character === character && prevChar !== "\\") {
            // Exiting a string
            modesEntered.pop();
          } else {
            // Entering a string
            modesEntered.push({
              mode: "string",
              character: character
            });
          }
          break;
        }
      // Entering url, other function or parens (only url matters)
      case "(":
        {
          if (mode === "comment" || mode === "string") {
            break;
          }
          var functionNameRegSearch = /(?:^|(?:\n)|(?:\r)|(?:\s-)|[:\s,.(){}*+/%])([a-zA-Z0-9_-]*)$/.exec(rawString.substring(0, i));
          // A `\S(` can be in, say, `@media(`
          if (!functionNameRegSearch) {
            modesEntered.push({
              mode: "parens",
              character: "("
            });
            break;
          }

          var functionName = functionNameRegSearch[1];
          modesEntered.push({
            mode: functionName === "url" ? "url" : "parens",
            character: "("
          });
          break;
        }
      // Exiting url, other function or parens
      case ")":
        {
          if (mode === "comment" || mode === "string") {
            break;
          }
          modesEntered.pop();
          break;
        }
      // checking for comment
      case "/":
        {
          // Break if the / is inside a comment because we leap over the second
          // slash in // and in */, so the / is not from a marker. Also break
          // if inside a string
          if (mode === "comment" || mode === "string") {
            break;
          }
          if (nextChar === "*") {
            modesEntered.push({
              mode: "comment",
              character: "/*"
            });
            comment = {
              type: "css",
              source: { start: i + offset },
              // If i is 0 then the file/the line starts with this comment
              inlineAfter: i > 0 && rawString.substring(0, i).search(/\n\s*$/) === -1
            };
            commentStart = i;
            // Skip the next iteration as the * is already checked
            i++;
          } else if (nextChar === "/") {
            // `url(//path/to/file)` has no comment
            if (mode === "url") {
              break;
            }
            modesEntered.push({
              mode: "comment",
              character: "//"
            });
            comment = {
              type: "double-slash",
              source: { start: i + offset },
              // If i is 0 then the file/the line starts with this comment
              inlineAfter: i > 0 && rawString.substring(0, i).search(/\n\s*$/) === -1
            };
            commentStart = i;
            // Skip the next iteration as the second slash in // is already checked
            i++;
          }
          break;
        }
      // Might be a closing `*/`
      case "*":
        {
          if (mode === "comment" && modesEntered[lastModeIndex].character === "/*" && nextChar === "/") {
            comment.source.end = i + 1 + offset;

            var commentRaw = rawString.substring(commentStart, i + 2);
            var matches = /^(\/\*+[!#]{0,1})(\s*)([\s\S]*?)(\s*?)(\*+\/)$/.exec(commentRaw);
            modesEntered.pop();
            comment.raws = {
              startToken: matches[1],
              left: matches[2],
              text: commentRaw,
              right: matches[4],
              endToken: matches[5]
            };
            comment.text = matches[3];
            comment.inlineBefore = rawString.substring(i + 2).search(/^\s*?\S+\s*?\n/) !== -1;
            result.push(_lodash2.default.assign({}, comment));
            comment = {};
            // Skip the next loop as the / in */ is already checked
            i++;
          }
          break;
        }
      default:
        {
          var isNewline = character === "\r" && rawString[i + 1] === "\n" || character === "\n" && rawString[i - 1] !== "\r";
          // //-comments end before newline and if the code string ends
          if (isNewline || i === rawString.length - 1) {
            if (mode === "comment" && modesEntered[lastModeIndex].character === "//") {
              comment.source.end = (isNewline ? i - 1 : i) + offset;

              var _commentRaw = rawString.substring(commentStart, isNewline ? i : i + 1);
              var _matches = /^(\/+)(\s*)(.*?)(\s*?)$/.exec(_commentRaw);

              modesEntered.pop();
              comment.raws = {
                startToken: _matches[1],
                left: _matches[2],
                text: _commentRaw,
                right: _matches[4]
              };
              comment.text = _matches[3];
              comment.inlineBefore = false;
              result.push(_lodash2.default.assign({}, comment));
              comment = {};
              // Compensate for the `*/` added by postcss-scss
              offset += 2;
            }
          }
          break;
        }
    }
  }

  return result;
}