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Filename : createStylelintResult.js
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/* @flow */
"use strict";

const _ = require("lodash");

/*:: type messageType = {
  type: string,
  text: string,
  line: number,
  column: number,
  severity: string,
  rule: string,
  node: Object,
  index: number,
  stylelintType?: string,
  stylelintReference?: string,
}
*/

/*:: type postcssResultType = {
  processor: {
    version: string,
    plugins: Array<any>,
  },
  messages: Array<messageType>,
  root: {
    raws: {
      semicolon: boolean,
      after: string,
    },
    type: string,
    nodes: Array<Object>,
    source: {
      input: Object,
      start: Object,
    },
    lastEach: number,
    indexes: Object,
  },
  opts: {
    from: ?string,
    syntax: ?{
      parse: Function,
      stringify: Function,
    },
  },
  css: string,
  map: ?any,
  stylelint: {
    ruleSeverities: Object,
    customMessages: Object,
    quiet: ?any,
    disabledRanges: {
      all: Array<any>,
    },
    ignored?: boolean,
    stylelintError?: boolean,
  },
}
*/

/*:: type configForFileType = {
  config: {
    codeProcessors?: Array<Function>,
    ignorePatterns?: string,
    processors?: Array<any>,
    quiet?: boolean,
    resultProcessors?: Array<Function>,
    rules: Object,
  },
  filepath: string,
}
*/

module.exports = function(
  stylelint /*: stylelint$internalApi*/,
  postcssResult /*: ?postcssResultType*/,
  filePath /*: ?string*/,
  cssSyntaxError /*: ?stylelint$cssSyntaxError*/
) /*: Promise<stylelint$result>*/ {
  let stylelintResult;
  let source;

  if (postcssResult) {
    source = !postcssResult.root.source
      ? undefined
      : postcssResult.root.source.input.file ||
        postcssResult.root.source.input.id;

    // Strip out deprecation warnings from the messages
    const deprecationMessages = _.remove(postcssResult.messages, {
      stylelintType: "deprecation"
    });
    const deprecations = deprecationMessages.map((
      deprecationMessage /*: messageType*/
    ) => {
      return {
        text: deprecationMessage.text,
        reference: deprecationMessage.stylelintReference
      };
    });

    // Also strip out invalid options
    const invalidOptionMessages = _.remove(postcssResult.messages, {
      stylelintType: "invalidOption"
    });
    const invalidOptionWarnings = invalidOptionMessages.map((
      invalidOptionMessage /*: messageType*/
    ) => {
      return {
        text: invalidOptionMessage.text
      };
    });

    const parseErrors = _.remove(postcssResult.messages, {
      stylelintType: "parseError"
    });

    // This defines the stylelint result object that formatters receive
    stylelintResult = {
      source,
      deprecations,
      invalidOptionWarnings,
      parseErrors,
      errored: postcssResult.stylelint.stylelintError,
      warnings: postcssResult.messages.map((message /*: messageType*/) => {
        return {
          line: message.line,
          column: message.column,
          rule: message.rule,
          severity: message.severity,
          text: message.text
        };
      }),
      ignored: postcssResult.stylelint.ignored,
      _postcssResult: postcssResult
    };
  } else if (cssSyntaxError) {
    if (cssSyntaxError.name !== "CssSyntaxError") {
      throw cssSyntaxError;
    }

    stylelintResult = {
      source: cssSyntaxError.file || "<input css 1>",
      deprecations: [],
      invalidOptionWarnings: [],
      parseErrors: [],
      errored: true,
      warnings: [
        {
          line: cssSyntaxError.line,
          column: cssSyntaxError.column,
          rule: cssSyntaxError.name,
          severity: "error",
          text: cssSyntaxError.reason + " (" + cssSyntaxError.name + ")"
        }
      ]
    };
  } else {
    throw new Error(
      "createStylelintResult must be called with either postcssResult or CssSyntaxError"
    );
  }

  return stylelint.getConfigForFile(filePath).then((
    configForFile /*: configForFileType*/
  ) => {
    const config = configForFile.config;
    const file = source || (cssSyntaxError && cssSyntaxError.file);

    if (config.resultProcessors) {
      config.resultProcessors.forEach(resultProcessor => {
        // Result processors might just mutate the result object,
        // or might return a new one
        const returned = resultProcessor(stylelintResult, file);

        if (returned) {
          stylelintResult = returned;
        }
      });
    }

    return stylelintResult;
  });
};