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'use strict';
Object.defineProperty(exports, "__esModule", {
value: true
});
var _postcss = require('postcss');
var _postcss2 = _interopRequireDefault(_postcss);
var _postcssValueParser = require('postcss-value-parser');
var _postcssValueParser2 = _interopRequireDefault(_postcssValueParser);
var _has = require('has');
var _has2 = _interopRequireDefault(_has);
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
*/
const T_ESCAPED_SINGLE_QUOTE = { type: C_ESCAPED_SINGLE_QUOTE, value: `\\'` };
const T_ESCAPED_DOUBLE_QUOTE = { type: C_ESCAPED_DOUBLE_QUOTE, value: `\\"` };
const T_SINGLE_QUOTE = { type: C_SINGLE_QUOTE, value: L_SINGLE_QUOTE };
const T_DOUBLE_QUOTE = { type: C_DOUBLE_QUOTE, value: L_DOUBLE_QUOTE };
const T_NEWLINE = { type: C_NEWLINE, value: L_NEWLINE };
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, _postcssValueParser2.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();
}
const params = {
rule: 'selector',
decl: 'value',
atrule: 'params'
};
exports.default = _postcss2.default.plugin('postcss-normalize-string', opts => {
const { preferredQuote } = Object.assign({}, {
preferredQuote: 'double'
}, opts);
return css => {
const cache = {};
css.walk(node => {
const { type } = node;
if ((0, _has2.default)(params, type)) {
const param = params[type];
const key = node[param] + '|' + preferredQuote;
if (cache[key]) {
node[param] = cache[key];
return;
}
const result = normalize(node[param], preferredQuote);
node[param] = result;
cache[key] = result;
}
});
};
});
module.exports = exports['default'];