CasperSecurity
var cmpChar = require('../../tokenizer').cmpChar;
var isDigit = require('../../tokenizer').isDigit;
var TYPE = require('../../tokenizer').TYPE;
var WHITESPACE = TYPE.WhiteSpace;
var COMMENT = TYPE.Comment;
var IDENT = TYPE.Ident;
var NUMBER = TYPE.Number;
var DIMENSION = TYPE.Dimension;
var PLUSSIGN = 0x002B; // U+002B PLUS SIGN (+)
var HYPHENMINUS = 0x002D; // U+002D HYPHEN-MINUS (-)
var N = 0x006E; // U+006E LATIN SMALL LETTER N (n)
var DISALLOW_SIGN = true;
var ALLOW_SIGN = false;
function checkInteger(offset, disallowSign) {
var pos = this.scanner.tokenStart + offset;
var code = this.scanner.source.charCodeAt(pos);
if (code === PLUSSIGN || code === HYPHENMINUS) {
if (disallowSign) {
this.error('Number sign is not allowed');
}
pos++;
}
for (; pos < this.scanner.tokenEnd; pos++) {
if (!isDigit(this.scanner.source.charCodeAt(pos))) {
this.error('Integer is expected', pos);
}
}
}
function checkTokenIsInteger(disallowSign) {
return checkInteger.call(this, 0, disallowSign);
}
function expectCharCode(offset, code) {
if (!cmpChar(this.scanner.source, this.scanner.tokenStart + offset, code)) {
var msg = '';
switch (code) {
case N:
msg = 'N is expected';
break;
case HYPHENMINUS:
msg = 'HyphenMinus is expected';
break;
}
this.error(msg, this.scanner.tokenStart + offset);
}
}
// ... <signed-integer>
// ... ['+' | '-'] <signless-integer>
function consumeB() {
var offset = 0;
var sign = 0;
var type = this.scanner.tokenType;
while (type === WHITESPACE || type === COMMENT) {
type = this.scanner.lookupType(++offset);
}
if (type !== NUMBER) {
if (this.scanner.isDelim(PLUSSIGN, offset) ||
this.scanner.isDelim(HYPHENMINUS, offset)) {
sign = this.scanner.isDelim(PLUSSIGN, offset) ? PLUSSIGN : HYPHENMINUS;
do {
type = this.scanner.lookupType(++offset);
} while (type === WHITESPACE || type === COMMENT);
if (type !== NUMBER) {
this.scanner.skip(offset);
checkTokenIsInteger.call(this, DISALLOW_SIGN);
}
} else {
return null;
}
}
if (offset > 0) {
this.scanner.skip(offset);
}
if (sign === 0) {
type = this.scanner.source.charCodeAt(this.scanner.tokenStart);
if (type !== PLUSSIGN && type !== HYPHENMINUS) {
this.error('Number sign is expected');
}
}
checkTokenIsInteger.call(this, sign !== 0);
return sign === HYPHENMINUS ? '-' + this.consume(NUMBER) : this.consume(NUMBER);
}
// An+B microsyntax https://www.w3.org/TR/css-syntax-3/#anb
module.exports = {
name: 'AnPlusB',
structure: {
a: [String, null],
b: [String, null]
},
parse: function() {
/* eslint-disable brace-style*/
var start = this.scanner.tokenStart;
var a = null;
var b = null;
// <integer>
if (this.scanner.tokenType === NUMBER) {
checkTokenIsInteger.call(this, ALLOW_SIGN);
b = this.consume(NUMBER);
}
// -n
// -n <signed-integer>
// -n ['+' | '-'] <signless-integer>
// -n- <signless-integer>
// <dashndashdigit-ident>
else if (this.scanner.tokenType === IDENT && cmpChar(this.scanner.source, this.scanner.tokenStart, HYPHENMINUS)) {
a = '-1';
expectCharCode.call(this, 1, N);
switch (this.scanner.getTokenLength()) {
// -n
// -n <signed-integer>
// -n ['+' | '-'] <signless-integer>
case 2:
this.scanner.next();
b = consumeB.call(this);
break;
// -n- <signless-integer>
case 3:
expectCharCode.call(this, 2, HYPHENMINUS);
this.scanner.next();
this.scanner.skipSC();
checkTokenIsInteger.call(this, DISALLOW_SIGN);
b = '-' + this.consume(NUMBER);
break;
// <dashndashdigit-ident>
default:
expectCharCode.call(this, 2, HYPHENMINUS);
checkInteger.call(this, 3, DISALLOW_SIGN);
this.scanner.next();
b = this.scanner.substrToCursor(start + 2);
}
}
// '+'? n
// '+'? n <signed-integer>
// '+'? n ['+' | '-'] <signless-integer>
// '+'? n- <signless-integer>
// '+'? <ndashdigit-ident>
else if (this.scanner.tokenType === IDENT || (this.scanner.isDelim(PLUSSIGN) && this.scanner.lookupType(1) === IDENT)) {
var sign = 0;
a = '1';
// just ignore a plus
if (this.scanner.isDelim(PLUSSIGN)) {
sign = 1;
this.scanner.next();
}
expectCharCode.call(this, 0, N);
switch (this.scanner.getTokenLength()) {
// '+'? n
// '+'? n <signed-integer>
// '+'? n ['+' | '-'] <signless-integer>
case 1:
this.scanner.next();
b = consumeB.call(this);
break;
// '+'? n- <signless-integer>
case 2:
expectCharCode.call(this, 1, HYPHENMINUS);
this.scanner.next();
this.scanner.skipSC();
checkTokenIsInteger.call(this, DISALLOW_SIGN);
b = '-' + this.consume(NUMBER);
break;
// '+'? <ndashdigit-ident>
default:
expectCharCode.call(this, 1, HYPHENMINUS);
checkInteger.call(this, 2, DISALLOW_SIGN);
this.scanner.next();
b = this.scanner.substrToCursor(start + sign + 1);
}
}
// <ndashdigit-dimension>
// <ndash-dimension> <signless-integer>
// <n-dimension>
// <n-dimension> <signed-integer>
// <n-dimension> ['+' | '-'] <signless-integer>
else if (this.scanner.tokenType === DIMENSION) {
var code = this.scanner.source.charCodeAt(this.scanner.tokenStart);
var sign = code === PLUSSIGN || code === HYPHENMINUS;
for (var i = this.scanner.tokenStart + sign; i < this.scanner.tokenEnd; i++) {
if (!isDigit(this.scanner.source.charCodeAt(i))) {
break;
}
}
if (i === this.scanner.tokenStart + sign) {
this.error('Integer is expected', this.scanner.tokenStart + sign);
}
expectCharCode.call(this, i - this.scanner.tokenStart, N);
a = this.scanner.source.substring(start, i);
// <n-dimension>
// <n-dimension> <signed-integer>
// <n-dimension> ['+' | '-'] <signless-integer>
if (i + 1 === this.scanner.tokenEnd) {
this.scanner.next();
b = consumeB.call(this);
} else {
expectCharCode.call(this, i - this.scanner.tokenStart + 1, HYPHENMINUS);
// <ndash-dimension> <signless-integer>
if (i + 2 === this.scanner.tokenEnd) {
this.scanner.next();
this.scanner.skipSC();
checkTokenIsInteger.call(this, DISALLOW_SIGN);
b = '-' + this.consume(NUMBER);
}
// <ndashdigit-dimension>
else {
checkInteger.call(this, i - this.scanner.tokenStart + 2, DISALLOW_SIGN);
this.scanner.next();
b = this.scanner.substrToCursor(i + 1);
}
}
} else {
this.error();
}
if (a !== null && a.charCodeAt(0) === PLUSSIGN) {
a = a.substr(1);
}
if (b !== null && b.charCodeAt(0) === PLUSSIGN) {
b = b.substr(1);
}
return {
type: 'AnPlusB',
loc: this.getLocation(start, this.scanner.tokenStart),
a: a,
b: b
};
},
generate: function(node) {
var a = node.a !== null && node.a !== undefined;
var b = node.b !== null && node.b !== undefined;
if (a) {
this.chunk(
node.a === '+1' ? '+n' : // eslint-disable-line operator-linebreak, indent
node.a === '1' ? 'n' : // eslint-disable-line operator-linebreak, indent
node.a === '-1' ? '-n' : // eslint-disable-line operator-linebreak, indent
node.a + 'n' // eslint-disable-line operator-linebreak, indent
);
if (b) {
b = String(node.b);
if (b.charAt(0) === '-' || b.charAt(0) === '+') {
this.chunk(b.charAt(0));
this.chunk(b.substr(1));
} else {
this.chunk('+');
this.chunk(b);
}
}
} else {
this.chunk(String(node.b));
}
}
};