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import { ParserState, Context, Flags } from '../common';
import { Token } from '../token';
import { advanceChar, toHex, NumberKind } from './common';
import { CharTypes, CharFlags, isIdentifierStart } from './charClassifier';
import { Chars } from '../chars';
import { report, Errors, reportScannerError } from '../errors';
/**
* Scans numeric literal
*
* @param parser Parser object
* @param context Context masks
* @param isFloat
*/
export function scanNumber(parser: ParserState, context: Context, kind: NumberKind): Token {
// DecimalLiteral ::
// DecimalIntegerLiteral . DecimalDigits_opt
// . DecimalDigits
let char = parser.currentChar;
let value: any = 0;
let digit = 9;
let atStart = kind & NumberKind.Float ? 0 : 1;
let digits = 0;
let allowSeparator: 0 | 1 = 0;
if (kind & NumberKind.Float) {
value = '.' + scanDecimalDigitsOrSeparator(parser, char);
char = parser.currentChar;
// It is a Syntax Error if the MV is not an integer. (dot decimalDigits)
if (char === Chars.LowerN) report(parser, Errors.InvalidBigInt);
} else {
if (char === Chars.Zero) {
char = advanceChar(parser);
// Hex
if ((char | 32) === Chars.LowerX) {
kind = NumberKind.Hex | NumberKind.ValidBigIntKind;
char = advanceChar(parser); // skips 'X', 'x'
while (CharTypes[char] & (CharFlags.Hex | CharFlags.Underscore)) {
if (char === Chars.Underscore) {
if (!allowSeparator) report(parser, Errors.ContinuousNumericSeparator);
allowSeparator = 0;
char = advanceChar(parser);
continue;
}
allowSeparator = 1;
value = value * 0x10 + toHex(char);
digits++;
char = advanceChar(parser);
}
if (digits < 1 || !allowSeparator) {
report(parser, digits < 1 ? Errors.MissingHexDigits : Errors.TrailingNumericSeparator);
}
// Octal
} else if ((char | 32) === Chars.LowerO) {
kind = NumberKind.Octal | NumberKind.ValidBigIntKind;
char = advanceChar(parser); // skips 'X', 'x'
while (CharTypes[char] & (CharFlags.Octal | CharFlags.Underscore)) {
if (char === Chars.Underscore) {
if (!allowSeparator) {
report(parser, Errors.ContinuousNumericSeparator);
}
allowSeparator = 0;
char = advanceChar(parser);
continue;
}
allowSeparator = 1;
value = value * 8 + (char - Chars.Zero);
digits++;
char = advanceChar(parser);
}
if (digits < 1 || !allowSeparator) {
report(parser, digits < 1 ? Errors.Unexpected : Errors.TrailingNumericSeparator);
}
} else if ((char | 32) === Chars.LowerB) {
kind = NumberKind.Binary | NumberKind.ValidBigIntKind;
char = advanceChar(parser); // skips 'B', 'b'
while (CharTypes[char] & (CharFlags.Binary | CharFlags.Underscore)) {
if (char === Chars.Underscore) {
if (!allowSeparator) {
report(parser, Errors.ContinuousNumericSeparator);
}
allowSeparator = 0;
char = advanceChar(parser);
continue;
}
allowSeparator = 1;
value = value * 2 + (char - Chars.Zero);
digits++;
char = advanceChar(parser);
}
if (digits < 1 || !allowSeparator) {
report(parser, digits < 1 ? Errors.Unexpected : Errors.TrailingNumericSeparator);
}
} else if (CharTypes[char] & CharFlags.Octal) {
// Octal integer literals are not permitted in strict mode code
if (context & Context.Strict) report(parser, Errors.StrictOctalEscape);
kind = NumberKind.ImplicitOctal;
while (CharTypes[char] & CharFlags.Decimal) {
if (CharTypes[char] & CharFlags.ImplicitOctalDigits) {
kind = NumberKind.NonOctalDecimal;
atStart = 0;
break;
}
value = value * 8 + (char - Chars.Zero);
char = advanceChar(parser);
}
} else if (CharTypes[char] & CharFlags.ImplicitOctalDigits) {
if (context & Context.Strict) report(parser, Errors.StrictOctalEscape);
parser.flags |= Flags.Octals;
kind = NumberKind.NonOctalDecimal;
} else if (char === Chars.Underscore) {
report(parser, Errors.Unexpected);
}
}
// Parse decimal digits and allow trailing fractional part
if (kind & NumberKind.DecimalNumberKind) {
if (atStart) {
while (digit >= 0 && CharTypes[char] & (CharFlags.Decimal | CharFlags.Underscore)) {
if (char === Chars.Underscore) {
char = advanceChar(parser);
if (char === Chars.Underscore || kind & NumberKind.NonOctalDecimal) {
reportScannerError(
parser.index,
parser.line,
parser.index + 1 /* skips `_` */,
Errors.ContinuousNumericSeparator
);
}
allowSeparator = 1;
continue;
}
allowSeparator = 0;
value = 10 * value + (char - Chars.Zero);
char = advanceChar(parser);
--digit;
}
if (allowSeparator) {
reportScannerError(
parser.index,
parser.line,
parser.index + 1 /* skips `_` */,
Errors.TrailingNumericSeparator
);
}
if (digit >= 0 && !isIdentifierStart(char) && char !== Chars.Period) {
// Most numbers are pure decimal integers without fractional component
// or exponential notation. Handle that with optimized code.
parser.tokenValue = value;
if (context & Context.OptionsRaw) parser.tokenRaw = parser.source.slice(parser.tokenPos, parser.index);
return Token.NumericLiteral;
}
}
value += scanDecimalDigitsOrSeparator(parser, char);
char = parser.currentChar;
// Consume any decimal dot and fractional component.
if (char === Chars.Period) {
if (advanceChar(parser) === Chars.Underscore) report(parser, Errors.Unexpected);
kind = NumberKind.Float;
value += '.' + scanDecimalDigitsOrSeparator(parser, parser.currentChar);
char = parser.currentChar;
}
}
}
const end = parser.index;
let isBigInt: 0 | 1 = 0;
if (char === Chars.LowerN && kind & NumberKind.ValidBigIntKind) {
isBigInt = 1;
char = advanceChar(parser);
} else {
// Consume any exponential notation.
if ((char | 32) === Chars.LowerE) {
char = advanceChar(parser);
// '-', '+'
if (CharTypes[char] & CharFlags.Exponent) char = advanceChar(parser);
const { index } = parser;
// Exponential notation must contain at least one digit
if ((CharTypes[char] & CharFlags.Decimal) < 1) report(parser, Errors.MissingExponent);
// Consume exponential digits
value += parser.source.substring(end, index) + scanDecimalDigitsOrSeparator(parser, char);
char = parser.currentChar;
}
}
// The source character immediately following a numeric literal must
// not be an identifier start or a decimal digit
if ((parser.index < parser.end && CharTypes[char] & CharFlags.Decimal) || isIdentifierStart(char)) {
report(parser, Errors.IDStartAfterNumber);
}
if (isBigInt) {
parser.tokenRaw = parser.source.slice(parser.tokenPos, parser.index);
parser.tokenValue = BigInt(value);
return Token.BigIntLiteral;
}
parser.tokenValue =
kind & (NumberKind.ImplicitOctal | NumberKind.Binary | NumberKind.Hex | NumberKind.Octal)
? value
: kind & NumberKind.NonOctalDecimal
? parseFloat(parser.source.substring(parser.tokenPos, parser.index))
: +value;
if (context & Context.OptionsRaw) parser.tokenRaw = parser.source.slice(parser.tokenPos, parser.index);
return Token.NumericLiteral;
}
/**
* Scans numeric literal and skip underscore '_' if it exist
*
* @param parser Parser object
* @param char Code point
*/
export function scanDecimalDigitsOrSeparator(parser: ParserState, char: number): string {
let allowSeparator: 0 | 1 = 0;
let start = parser.index;
let ret = '';
while (CharTypes[char] & (CharFlags.Decimal | CharFlags.Underscore)) {
if (char === Chars.Underscore) {
const { index } = parser;
char = advanceChar(parser);
if (char === Chars.Underscore) {
reportScannerError(
parser.index,
parser.line,
parser.index + 1 /* skips `_` */,
Errors.ContinuousNumericSeparator
);
}
allowSeparator = 1;
ret += parser.source.substring(start, index);
start = parser.index;
continue;
}
allowSeparator = 0;
char = advanceChar(parser);
}
if (allowSeparator) {
reportScannerError(parser.index, parser.line, parser.index + 1 /* skips `_` */, Errors.TrailingNumericSeparator);
}
return ret + parser.source.substring(start, parser.index);
}
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