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MIT License
Copyright (c) 2014-present Sebastian McKenzie and other contributors
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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# @babel/helper-string-parser
> A utility package to parse strings
See our website [@babel/helper-string-parser](https://babeljs.io/docs/babel-helper-string-parser) for more information.
## Install
Using npm:
```sh
npm install --save @babel/helper-string-parser
```
or using yarn:
```sh
yarn add @babel/helper-string-parser
```

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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.readCodePoint = readCodePoint;
exports.readInt = readInt;
exports.readStringContents = readStringContents;
var _isDigit = function isDigit(code) {
return code >= 48 && code <= 57;
};
const forbiddenNumericSeparatorSiblings = {
decBinOct: new Set([46, 66, 69, 79, 95, 98, 101, 111]),
hex: new Set([46, 88, 95, 120])
};
const isAllowedNumericSeparatorSibling = {
bin: ch => ch === 48 || ch === 49,
oct: ch => ch >= 48 && ch <= 55,
dec: ch => ch >= 48 && ch <= 57,
hex: ch => ch >= 48 && ch <= 57 || ch >= 65 && ch <= 70 || ch >= 97 && ch <= 102
};
function readStringContents(type, input, pos, lineStart, curLine, errors) {
const initialPos = pos;
const initialLineStart = lineStart;
const initialCurLine = curLine;
let out = "";
let firstInvalidLoc = null;
let chunkStart = pos;
const {
length
} = input;
for (;;) {
if (pos >= length) {
errors.unterminated(initialPos, initialLineStart, initialCurLine);
out += input.slice(chunkStart, pos);
break;
}
const ch = input.charCodeAt(pos);
if (isStringEnd(type, ch, input, pos)) {
out += input.slice(chunkStart, pos);
break;
}
if (ch === 92) {
out += input.slice(chunkStart, pos);
const res = readEscapedChar(input, pos, lineStart, curLine, type === "template", errors);
if (res.ch === null && !firstInvalidLoc) {
firstInvalidLoc = {
pos,
lineStart,
curLine
};
} else {
out += res.ch;
}
({
pos,
lineStart,
curLine
} = res);
chunkStart = pos;
} else if (ch === 8232 || ch === 8233) {
++pos;
++curLine;
lineStart = pos;
} else if (ch === 10 || ch === 13) {
if (type === "template") {
out += input.slice(chunkStart, pos) + "\n";
++pos;
if (ch === 13 && input.charCodeAt(pos) === 10) {
++pos;
}
++curLine;
chunkStart = lineStart = pos;
} else {
errors.unterminated(initialPos, initialLineStart, initialCurLine);
}
} else {
++pos;
}
}
return {
pos,
str: out,
firstInvalidLoc,
lineStart,
curLine,
containsInvalid: !!firstInvalidLoc
};
}
function isStringEnd(type, ch, input, pos) {
if (type === "template") {
return ch === 96 || ch === 36 && input.charCodeAt(pos + 1) === 123;
}
return ch === (type === "double" ? 34 : 39);
}
function readEscapedChar(input, pos, lineStart, curLine, inTemplate, errors) {
const throwOnInvalid = !inTemplate;
pos++;
const res = ch => ({
pos,
ch,
lineStart,
curLine
});
const ch = input.charCodeAt(pos++);
switch (ch) {
case 110:
return res("\n");
case 114:
return res("\r");
case 120:
{
let code;
({
code,
pos
} = readHexChar(input, pos, lineStart, curLine, 2, false, throwOnInvalid, errors));
return res(code === null ? null : String.fromCharCode(code));
}
case 117:
{
let code;
({
code,
pos
} = readCodePoint(input, pos, lineStart, curLine, throwOnInvalid, errors));
return res(code === null ? null : String.fromCodePoint(code));
}
case 116:
return res("\t");
case 98:
return res("\b");
case 118:
return res("\u000b");
case 102:
return res("\f");
case 13:
if (input.charCodeAt(pos) === 10) {
++pos;
}
case 10:
lineStart = pos;
++curLine;
case 8232:
case 8233:
return res("");
case 56:
case 57:
if (inTemplate) {
return res(null);
} else {
errors.strictNumericEscape(pos - 1, lineStart, curLine);
}
default:
if (ch >= 48 && ch <= 55) {
const startPos = pos - 1;
const match = /^[0-7]+/.exec(input.slice(startPos, pos + 2));
let octalStr = match[0];
let octal = parseInt(octalStr, 8);
if (octal > 255) {
octalStr = octalStr.slice(0, -1);
octal = parseInt(octalStr, 8);
}
pos += octalStr.length - 1;
const next = input.charCodeAt(pos);
if (octalStr !== "0" || next === 56 || next === 57) {
if (inTemplate) {
return res(null);
} else {
errors.strictNumericEscape(startPos, lineStart, curLine);
}
}
return res(String.fromCharCode(octal));
}
return res(String.fromCharCode(ch));
}
}
function readHexChar(input, pos, lineStart, curLine, len, forceLen, throwOnInvalid, errors) {
const initialPos = pos;
let n;
({
n,
pos
} = readInt(input, pos, lineStart, curLine, 16, len, forceLen, false, errors, !throwOnInvalid));
if (n === null) {
if (throwOnInvalid) {
errors.invalidEscapeSequence(initialPos, lineStart, curLine);
} else {
pos = initialPos - 1;
}
}
return {
code: n,
pos
};
}
function readInt(input, pos, lineStart, curLine, radix, len, forceLen, allowNumSeparator, errors, bailOnError) {
const start = pos;
const forbiddenSiblings = radix === 16 ? forbiddenNumericSeparatorSiblings.hex : forbiddenNumericSeparatorSiblings.decBinOct;
const isAllowedSibling = radix === 16 ? isAllowedNumericSeparatorSibling.hex : radix === 10 ? isAllowedNumericSeparatorSibling.dec : radix === 8 ? isAllowedNumericSeparatorSibling.oct : isAllowedNumericSeparatorSibling.bin;
let invalid = false;
let total = 0;
for (let i = 0, e = len == null ? Infinity : len; i < e; ++i) {
const code = input.charCodeAt(pos);
let val;
if (code === 95 && allowNumSeparator !== "bail") {
const prev = input.charCodeAt(pos - 1);
const next = input.charCodeAt(pos + 1);
if (!allowNumSeparator) {
if (bailOnError) return {
n: null,
pos
};
errors.numericSeparatorInEscapeSequence(pos, lineStart, curLine);
} else if (Number.isNaN(next) || !isAllowedSibling(next) || forbiddenSiblings.has(prev) || forbiddenSiblings.has(next)) {
if (bailOnError) return {
n: null,
pos
};
errors.unexpectedNumericSeparator(pos, lineStart, curLine);
}
++pos;
continue;
}
if (code >= 97) {
val = code - 97 + 10;
} else if (code >= 65) {
val = code - 65 + 10;
} else if (_isDigit(code)) {
val = code - 48;
} else {
val = Infinity;
}
if (val >= radix) {
if (val <= 9 && bailOnError) {
return {
n: null,
pos
};
} else if (val <= 9 && errors.invalidDigit(pos, lineStart, curLine, radix)) {
val = 0;
} else if (forceLen) {
val = 0;
invalid = true;
} else {
break;
}
}
++pos;
total = total * radix + val;
}
if (pos === start || len != null && pos - start !== len || invalid) {
return {
n: null,
pos
};
}
return {
n: total,
pos
};
}
function readCodePoint(input, pos, lineStart, curLine, throwOnInvalid, errors) {
const ch = input.charCodeAt(pos);
let code;
if (ch === 123) {
++pos;
({
code,
pos
} = readHexChar(input, pos, lineStart, curLine, input.indexOf("}", pos) - pos, true, throwOnInvalid, errors));
++pos;
if (code !== null && code > 0x10ffff) {
if (throwOnInvalid) {
errors.invalidCodePoint(pos, lineStart, curLine);
} else {
return {
code: null,
pos
};
}
}
} else {
({
code,
pos
} = readHexChar(input, pos, lineStart, curLine, 4, false, throwOnInvalid, errors));
}
return {
code,
pos
};
}
//# sourceMappingURL=index.js.map

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{
"name": "@babel/helper-string-parser",
"version": "7.27.1",
"description": "A utility package to parse strings",
"repository": {
"type": "git",
"url": "https://github.com/babel/babel.git",
"directory": "packages/babel-helper-string-parser"
},
"homepage": "https://babel.dev/docs/en/next/babel-helper-string-parser",
"license": "MIT",
"publishConfig": {
"access": "public"
},
"main": "./lib/index.js",
"devDependencies": {
"charcodes": "^0.2.0"
},
"engines": {
"node": ">=6.9.0"
},
"author": "The Babel Team (https://babel.dev/team)",
"exports": {
".": {
"types": "./lib/index.d.ts",
"default": "./lib/index.js"
},
"./package.json": "./package.json"
},
"type": "commonjs"
}