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Viewing / Editing File: index.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

var _postcssValueParser = _interopRequireDefault(require("postcss-value-parser"));

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

/*
 * Constants (parser usage)
 */
const SINGLE_QUOTE = "'".charCodeAt(0);
const DOUBLE_QUOTE = '"'.charCodeAt(0);
const BACKSLASH = '\\'.charCodeAt(0);
const NEWLINE = '\n'.charCodeAt(0);
const SPACE = ' '.charCodeAt(0);
const FEED = '\f'.charCodeAt(0);
const TAB = '\t'.charCodeAt(0);
const CR = '\r'.charCodeAt(0);
const WORD_END = /[ \n\t\r\f'"\\]/g;
/*
 * Constants (node type strings)
 */

const C_STRING = 'string';
const C_ESCAPED_SINGLE_QUOTE = 'escapedSingleQuote';
const C_ESCAPED_DOUBLE_QUOTE = 'escapedDoubleQuote';
const C_SINGLE_QUOTE = 'singleQuote';
const C_DOUBLE_QUOTE = 'doubleQuote';
const C_NEWLINE = 'newline';
const C_SINGLE = 'single';
/*
 * Literals
 */

const L_SINGLE_QUOTE = `'`;
const L_DOUBLE_QUOTE = `"`;
const L_NEWLINE = `\\\n`;
/*
 * Parser nodes
 */

function stringify(ast) {
  return ast.nodes.reduce((str, {
    value
  }) => {
    // Collapse multiple line strings automatically
    if (value === L_NEWLINE) {
      return str;
    }

return str + value;
  }, '');
}

function parse(str) {
  let code, next, value;
  let pos = 0;
  let len = str.length;
  const ast = {
    nodes: [],
    types: {
      escapedSingleQuote: 0,
      escapedDoubleQuote: 0,
      singleQuote: 0,
      doubleQuote: 0
    },
    quotes: false
  };

while (pos < len) {
    code = str.charCodeAt(pos);

switch (code) {
      case SPACE:
      case TAB:
      case CR:
      case FEED:
        next = pos;

do {
          next += 1;
          code = str.charCodeAt(next);
        } while (code === SPACE || code === NEWLINE || code === TAB || code === CR || code === FEED);

ast.nodes.push({
          type: 'space',
          value: str.slice(pos, next)
        });
        pos = next - 1;
        break;

case SINGLE_QUOTE:
        ast.nodes.push(T_SINGLE_QUOTE);
        ast.types[C_SINGLE_QUOTE]++;
        ast.quotes = true;
        break;

case DOUBLE_QUOTE:
        ast.nodes.push(T_DOUBLE_QUOTE);
        ast.types[C_DOUBLE_QUOTE]++;
        ast.quotes = true;
        break;

case BACKSLASH:
        next = pos + 1;

if (str.charCodeAt(next) === SINGLE_QUOTE) {
          ast.nodes.push(T_ESCAPED_SINGLE_QUOTE);
          ast.types[C_ESCAPED_SINGLE_QUOTE]++;
          ast.quotes = true;
          pos = next;
          break;
        } else if (str.charCodeAt(next) === DOUBLE_QUOTE) {
          ast.nodes.push(T_ESCAPED_DOUBLE_QUOTE);
          ast.types[C_ESCAPED_DOUBLE_QUOTE]++;
          ast.quotes = true;
          pos = next;
          break;
        } else if (str.charCodeAt(next) === NEWLINE) {
          ast.nodes.push(T_NEWLINE);
          pos = next;
          break;
        }

/*
       * We need to fall through here to handle the token as
       * a whole word. The missing 'break' is intentional.
       */

default:
        WORD_END.lastIndex = pos + 1;
        WORD_END.test(str);

if (WORD_END.lastIndex === 0) {
          next = len - 1;
        } else {
          next = WORD_END.lastIndex - 2;
        }

value = str.slice(pos, next + 1);
        ast.nodes.push({
          type: C_STRING,
          value
        });
        pos = next;
    }

pos++;
  }

return ast;
}

function changeWrappingQuotes(node, ast) {
  const {
    types
  } = ast;

if (types[C_SINGLE_QUOTE] || types[C_DOUBLE_QUOTE]) {
    return;
  }

if (node.quote === L_SINGLE_QUOTE && types[C_ESCAPED_SINGLE_QUOTE] > 0 && !types[C_ESCAPED_DOUBLE_QUOTE]) {
    node.quote = L_DOUBLE_QUOTE;
  }

if (node.quote === L_DOUBLE_QUOTE && types[C_ESCAPED_DOUBLE_QUOTE] > 0 && !types[C_ESCAPED_SINGLE_QUOTE]) {
    node.quote = L_SINGLE_QUOTE;
  }

ast.nodes = ast.nodes.reduce((newAst, child) => {
    if (child.type === C_ESCAPED_DOUBLE_QUOTE && node.quote === L_SINGLE_QUOTE) {
      return [...newAst, T_DOUBLE_QUOTE];
    }

if (child.type === C_ESCAPED_SINGLE_QUOTE && node.quote === L_DOUBLE_QUOTE) {
      return [...newAst, T_SINGLE_QUOTE];
    }

return [...newAst, child];
  }, []);
}

function normalize(value, preferredQuote) {
  if (!value || !value.length) {
    return value;
  }

return (0, _postcssValueParser.default)(value).walk(child => {
    if (child.type !== C_STRING) {
      return;
    }

const ast = parse(child.value);

if (ast.quotes) {
      changeWrappingQuotes(child, ast);
    } else if (preferredQuote === C_SINGLE) {
      child.quote = L_SINGLE_QUOTE;
    } else {
      child.quote = L_DOUBLE_QUOTE;
    }

child.value = stringify(ast);
  }).toString();
}

function minify(original, cache, preferredQuote) {
  const key = original + '|' + preferredQuote;

if (cache.has(key)) {
    return cache.get(key);
  }

const newValue = normalize(original, preferredQuote);
  cache.set(key, newValue);
  return newValue;
}

function pluginCreator(opts) {
  const {
    preferredQuote
  } = Object.assign({}, {
    preferredQuote: 'double'
  }, opts);
  return {
    postcssPlugin: 'postcss-normalize-string',

OnceExit(css) {
      const cache = new Map();
      css.walk(node => {
        switch (node.type) {
          case 'rule':
            node.selector = minify(node.selector, cache, preferredQuote);
            break;

case 'decl':
            node.value = minify(node.value, cache, preferredQuote);
            break;

case 'atrule':
            node.params = minify(node.params, cache, preferredQuote);
            break;
        }
      });
    }

};
}

pluginCreator.postcss = true;
var _default = pluginCreator;
exports.default = _default;
module.exports = exports.default;

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