graphql
Version:
A Query Language and Runtime which can target any service.
1 lines • 44.1 kB
Source Map (JSON)
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@category Lexing */\n\nimport { syntaxError } from '../error/syntaxError.ts';\n\nimport { Token } from './ast.ts';\nimport { dedentBlockStringLines } from './blockString.ts';\nimport { isDigit, isNameContinue, isNameStart } from './characterClasses.ts';\nimport type { Source } from './source.ts';\nimport { TokenKind } from './tokenKind.ts';\n\n/**\n * A Lexer interface which provides common properties and methods required for\n * lexing GraphQL source.\n *\n * @internal\n */\nexport interface LexerInterface {\n source: Source;\n lastToken: Token;\n token: Token;\n line: number;\n lineStart: number;\n advance: () => Token;\n lookahead: () => Token;\n}\n\n/**\n * Given a Source object, creates a Lexer for that source.\n * A Lexer is a stateful stream generator in that every time\n * it is advanced, it returns the next token in the Source. Assuming the\n * source lexes, the final Token emitted by the lexer will be of kind\n * EOF, after which the lexer will repeatedly return the same EOF token\n * whenever called.\n */\nexport class Lexer implements LexerInterface {\n /** Source document used to derive error locations. */\n source: Source;\n\n /** Most recent non-ignored token returned by the lexer. */\n lastToken: Token;\n\n /** Current non-ignored token at the lexer cursor. */\n token: Token;\n\n /** The (1-indexed) line containing the current token. */\n line: number;\n\n /** Character offset where the current line starts. */\n lineStart: number;\n\n /**\n * Creates a Lexer instance.\n * @param source - Source document used to derive error locations.\n * @example\n * ```ts\n * import { Lexer, Source, TokenKind } from 'graphql/language';\n *\n * const lexer = new Lexer(new Source('{ hello }'));\n *\n * lexer.token.kind; // => TokenKind.SOF\n * lexer.advance().kind; // => TokenKind.BRACE_L\n * lexer.advance().value; // => 'hello'\n * lexer.advance().kind; // => TokenKind.BRACE_R\n * ```\n */\n constructor(source: Source) {\n const startOfFileToken = new Token(TokenKind.SOF, 0, 0, 0, 0);\n\n this.source = source;\n this.lastToken = startOfFileToken;\n this.token = startOfFileToken;\n this.line = 1;\n this.lineStart = 0;\n }\n\n /**\n * Returns the value used by `Object.prototype.toString`.\n * @returns The built-in string tag for this object.\n */\n get [Symbol.toStringTag](): string {\n return 'Lexer';\n }\n\n /**\n * Advances the token stream to the next non-ignored token.\n * @returns The next non-ignored token.\n * @example\n * ```ts\n * import { Lexer, Source } from 'graphql/language';\n *\n * const lexer = new Lexer(new Source('{ hello }'));\n * const token = lexer.advance();\n *\n * token.kind; // => '{'\n * lexer.token; // => token\n * ```\n */\n advance(): Token {\n this.lastToken = this.token;\n const token = (this.token = this.lookahead());\n return token;\n }\n\n /**\n * Looks ahead and returns the next non-ignored token, but does not change\n * the state of Lexer.\n * @returns The next non-ignored token without advancing the lexer.\n * @example\n * ```ts\n * import { Lexer, Source } from 'graphql/language';\n *\n * const lexer = new Lexer(new Source('{ hello }'));\n * const token = lexer.lookahead();\n *\n * token.kind; // => '{'\n * lexer.token.kind; // => '<SOF>'\n * ```\n */\n lookahead(): Token {\n let token = this.token;\n if (token.kind !== TokenKind.EOF) {\n do {\n if (token.next) {\n token = token.next;\n } else {\n // Read the next token and form a link in the token linked-list.\n const nextToken = readNextToken(this, token.end);\n // @ts-expect-error next is only mutable during parsing.\n token.next = nextToken;\n // @ts-expect-error prev is only mutable during parsing.\n nextToken.prev = token;\n token = nextToken;\n }\n } while (token.kind === TokenKind.COMMENT);\n }\n return token;\n }\n}\n\n/** @internal */\nexport function isPunctuatorTokenKind(kind: TokenKind): boolean {\n return (\n kind === TokenKind.BANG ||\n kind === TokenKind.DOLLAR ||\n kind === TokenKind.AMP ||\n kind === TokenKind.PAREN_L ||\n kind === TokenKind.PAREN_R ||\n kind === TokenKind.DOT ||\n kind === TokenKind.SPREAD ||\n kind === TokenKind.COLON ||\n kind === TokenKind.EQUALS ||\n kind === TokenKind.AT ||\n kind === TokenKind.BRACKET_L ||\n kind === TokenKind.BRACKET_R ||\n kind === TokenKind.BRACE_L ||\n kind === TokenKind.PIPE ||\n kind === TokenKind.BRACE_R\n );\n}\n\n/**\n * A Unicode scalar value is any Unicode code point except surrogate code\n * points. In other words, the inclusive ranges of values 0x0000 to 0xD7FF and\n * 0xE000 to 0x10FFFF.\n *\n * SourceCharacter ::\n * - \"Any Unicode scalar value\"\n *\n * @internal\n */\nfunction isUnicodeScalarValue(code: number): boolean {\n return (\n (code >= 0x0000 && code <= 0xd7ff) || (code >= 0xe000 && code <= 0x10ffff)\n );\n}\n\n/**\n * The GraphQL specification defines source text as a sequence of unicode scalar\n * values (which Unicode defines to exclude surrogate code points). However\n * JavaScript defines strings as a sequence of UTF-16 code units which may\n * include surrogates. A surrogate pair is a valid source character as it\n * encodes a supplementary code point (above U+FFFF), but unpaired surrogate\n * code points are not valid source characters.\n *\n * @internal\n */\nfunction isSupplementaryCodePoint(body: string, location: number): boolean {\n return (\n isLeadingSurrogate(body.charCodeAt(location)) &&\n isTrailingSurrogate(body.charCodeAt(location + 1))\n );\n}\n\nfunction isLeadingSurrogate(code: number): boolean {\n return code >= 0xd800 && code <= 0xdbff;\n}\n\nfunction isTrailingSurrogate(code: number): boolean {\n return code >= 0xdc00 && code <= 0xdfff;\n}\n\n/**\n * Prints the code point (or end of file reference) at a given location in a\n * source for use in error messages.\n *\n * Printable ASCII is printed quoted, while other points are printed in Unicode\n * code point form (ie. U+1234).\n *\n * @internal\n */\nexport function printCodePointAt(\n lexer: LexerInterface,\n location: number,\n): string {\n const code = lexer.source.body.codePointAt(location);\n\n if (code === undefined) {\n return TokenKind.EOF;\n } else if (code >= 0x0020 && code <= 0x007e) {\n // Printable ASCII\n const char = String.fromCodePoint(code);\n return char === '\"' ? \"'\\\"'\" : `\"${char}\"`;\n }\n\n // Unicode code point\n return 'U+' + code.toString(16).toUpperCase().padStart(4, '0');\n}\n\n/**\n * Create a token with line and column location information.\n *\n * @internal\n */\nexport function createToken(\n lexer: LexerInterface,\n kind: TokenKind,\n start: number,\n end: number,\n value?: string,\n): Token {\n const line = lexer.line;\n const col = 1 + start - lexer.lineStart;\n return new Token(kind, start, end, line, col, value);\n}\n\n/**\n * Gets the next token from the source starting at the given position.\n *\n * This skips over whitespace until it finds the next lexable token, then lexes\n * punctuators immediately or calls the appropriate helper function for more\n * complicated tokens.\n *\n * @internal\n */\nfunction readNextToken(lexer: Lexer, start: number): Token {\n const body = lexer.source.body;\n const bodyLength = body.length;\n let position = start;\n\n while (position < bodyLength) {\n const code = body.charCodeAt(position);\n\n // SourceCharacter\n switch (code) {\n // Ignored ::\n // - UnicodeBOM\n // - WhiteSpace\n // - LineTerminator\n // - Comment\n // - Comma\n //\n // UnicodeBOM :: \"Byte Order Mark (U+FEFF)\"\n //\n // WhiteSpace ::\n // - \"Horizontal Tab (U+0009)\"\n // - \"Space (U+0020)\"\n //\n // Comma :: ,\n case 0xfeff: // <BOM>\n case 0x0009: // \\t\n case 0x0020: // <space>\n case 0x002c: // ,\n ++position;\n continue;\n // LineTerminator ::\n // - \"New Line (U+000A)\"\n // - \"Carriage Return (U+000D)\" [lookahead != \"New Line (U+000A)\"]\n // - \"Carriage Return (U+000D)\" \"New Line (U+000A)\"\n case 0x000a: // \\n\n ++position;\n ++lexer.line;\n lexer.lineStart = position;\n continue;\n case 0x000d: // \\r\n if (body.charCodeAt(position + 1) === 0x000a) {\n position += 2;\n } else {\n ++position;\n }\n ++lexer.line;\n lexer.lineStart = position;\n continue;\n // Comment\n case 0x0023: // #\n return readComment(lexer, position);\n // Token ::\n // - Punctuator\n // - Name\n // - IntValue\n // - FloatValue\n // - StringValue\n //\n // Punctuator :: one of ! $ & ( ) ... : = @ [ ] { | }\n case 0x0021: // !\n return createToken(lexer, TokenKind.BANG, position, position + 1);\n case 0x0024: // $\n return createToken(lexer, TokenKind.DOLLAR, position, position + 1);\n case 0x0026: // &\n return createToken(lexer, TokenKind.AMP, position, position + 1);\n case 0x0028: // (\n return createToken(lexer, TokenKind.PAREN_L, position, position + 1);\n case 0x0029: // )\n return createToken(lexer, TokenKind.PAREN_R, position, position + 1);\n case 0x002e: {\n // .\n const nextCode = body.charCodeAt(position + 1);\n if (nextCode === 0x002e && body.charCodeAt(position + 2) === 0x002e) {\n return createToken(lexer, TokenKind.SPREAD, position, position + 3);\n }\n if (nextCode === 0x002e) {\n throw syntaxError(\n lexer.source,\n position,\n 'Unexpected \"..\", did you mean \"...\"?',\n );\n } else if (isDigit(nextCode)) {\n const digits = lexer.source.body.slice(\n position + 1,\n readDigits(lexer, position + 1, nextCode),\n );\n throw syntaxError(\n lexer.source,\n position,\n `Invalid number, expected digit before \".\", did you mean \"0.${digits}\"?`,\n );\n }\n break;\n }\n case 0x003a: // :\n return createToken(lexer, TokenKind.COLON, position, position + 1);\n case 0x003d: // =\n return createToken(lexer, TokenKind.EQUALS, position, position + 1);\n case 0x0040: // @\n return createToken(lexer, TokenKind.AT, position, position + 1);\n case 0x005b: // [\n return createToken(lexer, TokenKind.BRACKET_L, position, position + 1);\n case 0x005d: // ]\n return createToken(lexer, TokenKind.BRACKET_R, position, position + 1);\n case 0x007b: // {\n return createToken(lexer, TokenKind.BRACE_L, position, position + 1);\n case 0x007c: // |\n return createToken(lexer, TokenKind.PIPE, position, position + 1);\n case 0x007d: // }\n return createToken(lexer, TokenKind.BRACE_R, position, position + 1);\n // StringValue\n case 0x0022: // \"\n if (\n body.charCodeAt(position + 1) === 0x0022 &&\n body.charCodeAt(position + 2) === 0x0022\n ) {\n return readBlockString(lexer, position);\n }\n return readString(lexer, position);\n }\n\n // IntValue | FloatValue (Digit | -)\n if (isDigit(code) || code === 0x002d) {\n return readNumber(lexer, position, code);\n }\n\n // Name\n if (isNameStart(code)) {\n return readName(lexer, position);\n }\n\n throw syntaxError(\n lexer.source,\n position,\n code === 0x0027\n ? 'Unexpected single quote character (\\'), did you mean to use a double quote (\")?'\n : isUnicodeScalarValue(code) || isSupplementaryCodePoint(body, position)\n ? `Unexpected character: ${printCodePointAt(lexer, position)}.`\n : `Invalid character: ${printCodePointAt(lexer, position)}.`,\n );\n }\n\n return createToken(lexer, TokenKind.EOF, bodyLength, bodyLength);\n}\n\n/**\n * Reads a comment token from the source file.\n *\n * ```\n * Comment :: # CommentChar* [lookahead != CommentChar]\n *\n * CommentChar :: SourceCharacter but not LineTerminator\n * ```\n *\n * @internal\n */\nfunction readComment(lexer: Lexer, start: number): Token {\n const body = lexer.source.body;\n const bodyLength = body.length;\n let position = start + 1;\n\n while (position < bodyLength) {\n const code = body.charCodeAt(position);\n\n // LineTerminator (\\n | \\r)\n if (code === 0x000a || code === 0x000d) {\n break;\n }\n\n // SourceCharacter\n if (isUnicodeScalarValue(code)) {\n ++position;\n } else if (isSupplementaryCodePoint(body, position)) {\n position += 2;\n } else {\n break;\n }\n }\n\n return createToken(\n lexer,\n TokenKind.COMMENT,\n start,\n position,\n body.slice(start + 1, position),\n );\n}\n\n/**\n * Reads a number token from the source file, either a FloatValue or an IntValue\n * depending on whether a FractionalPart or ExponentPart is encountered.\n *\n * ```\n * IntValue :: IntegerPart [lookahead != {Digit, `.`, NameStart}]\n *\n * IntegerPart ::\n * - NegativeSign? 0\n * - NegativeSign? NonZeroDigit Digit*\n *\n * NegativeSign :: -\n *\n * NonZeroDigit :: Digit but not `0`\n *\n * FloatValue ::\n * - IntegerPart FractionalPart ExponentPart [lookahead != {Digit, `.`, NameStart}]\n * - IntegerPart FractionalPart [lookahead != {Digit, `.`, NameStart}]\n * - IntegerPart ExponentPart [lookahead != {Digit, `.`, NameStart}]\n *\n * FractionalPart :: . Digit+\n *\n * ExponentPart :: ExponentIndicator Sign? Digit+\n *\n * ExponentIndicator :: one of `e` `E`\n *\n * Sign :: one of + -\n * ```\n *\n * @internal\n */\nfunction readNumber(lexer: Lexer, start: number, firstCode: number): Token {\n const body = lexer.source.body;\n let position = start;\n let code = firstCode;\n let isFloat = false;\n\n // NegativeSign (-)\n if (code === 0x002d) {\n code = body.charCodeAt(++position);\n }\n\n // Zero (0)\n if (code === 0x0030) {\n code = body.charCodeAt(++position);\n if (isDigit(code)) {\n throw syntaxError(\n lexer.source,\n position,\n `Invalid number, unexpected digit after 0: ${printCodePointAt(\n lexer,\n position,\n )}.`,\n );\n }\n } else {\n position = readDigits(lexer, position, code);\n code = body.charCodeAt(position);\n }\n\n // Full stop (.)\n if (code === 0x002e) {\n isFloat = true;\n\n code = body.charCodeAt(++position);\n position = readDigits(lexer, position, code);\n code = body.charCodeAt(position);\n }\n\n // E e\n if (code === 0x0045 || code === 0x0065) {\n isFloat = true;\n\n code = body.charCodeAt(++position);\n // + -\n if (code === 0x002b || code === 0x002d) {\n code = body.charCodeAt(++position);\n }\n position = readDigits(lexer, position, code);\n code = body.charCodeAt(position);\n }\n\n // Numbers cannot be followed by . or NameStart\n if (code === 0x002e || isNameStart(code)) {\n throw syntaxError(\n lexer.source,\n position,\n `Invalid number, expected digit but got: ${printCodePointAt(\n lexer,\n position,\n )}.`,\n );\n }\n\n return createToken(\n lexer,\n isFloat ? TokenKind.FLOAT : TokenKind.INT,\n start,\n position,\n body.slice(start, position),\n );\n}\n\n/**\n * Returns the new position in the source after reading one or more digits.\n *\n * @internal\n */\nfunction readDigits(lexer: Lexer, start: number, firstCode: number): number {\n if (!isDigit(firstCode)) {\n throw syntaxError(\n lexer.source,\n start,\n `Invalid number, expected digit but got: ${printCodePointAt(\n lexer,\n start,\n )}.`,\n );\n }\n\n const body = lexer.source.body;\n let position = start + 1; // +1 to skip first firstCode\n\n while (isDigit(body.charCodeAt(position))) {\n ++position;\n }\n\n return position;\n}\n\n/**\n * Reads a single-quote string token from the source file.\n *\n * ```\n * StringValue ::\n * - `\"\"` [lookahead != `\"`]\n * - `\"` StringCharacter+ `\"`\n *\n * StringCharacter ::\n * - SourceCharacter but not `\"` or `\\` or LineTerminator\n * - `\\u` EscapedUnicode\n * - `\\` EscapedCharacter\n *\n * EscapedUnicode ::\n * - `{` HexDigit+ `}`\n * - HexDigit HexDigit HexDigit HexDigit\n *\n * EscapedCharacter :: one of `\"` `\\` `/` `b` `f` `n` `r` `t`\n * ```\n *\n * @internal\n */\nfunction readString(lexer: Lexer, start: number): Token {\n const body = lexer.source.body;\n const bodyLength = body.length;\n let position = start + 1;\n let chunkStart = position;\n let value = '';\n\n while (position < bodyLength) {\n const code = body.charCodeAt(position);\n\n // Closing Quote (\")\n if (code === 0x0022) {\n value += body.slice(chunkStart, position);\n return createToken(lexer, TokenKind.STRING, start, position + 1, value);\n }\n\n // Escape Sequence (\\)\n if (code === 0x005c) {\n value += body.slice(chunkStart, position);\n const escape =\n body.charCodeAt(position + 1) === 0x0075 // u\n ? body.charCodeAt(position + 2) === 0x007b // {\n ? readEscapedUnicodeVariableWidth(lexer, position)\n : readEscapedUnicodeFixedWidth(lexer, position)\n : readEscapedCharacter(lexer, position);\n value += escape.value;\n position += escape.size;\n chunkStart = position;\n continue;\n }\n\n // LineTerminator (\\n | \\r)\n if (code === 0x000a || code === 0x000d) {\n break;\n }\n\n // SourceCharacter\n if (isUnicodeScalarValue(code)) {\n ++position;\n } else if (isSupplementaryCodePoint(body, position)) {\n position += 2;\n } else {\n throw syntaxError(\n lexer.source,\n position,\n `Invalid character within String: ${printCodePointAt(\n lexer,\n position,\n )}.`,\n );\n }\n }\n\n throw syntaxError(lexer.source, position, 'Unterminated string.');\n}\n\n// The string value and lexed size of an escape sequence.\ninterface EscapeSequence {\n value: string;\n size: number;\n}\n\nfunction readEscapedUnicodeVariableWidth(\n lexer: Lexer,\n position: number,\n): EscapeSequence {\n const body = lexer.source.body;\n let point = 0;\n let size = 3;\n // Cannot be larger than 12 chars (\\u{00000000}).\n while (size < 12) {\n const code = body.charCodeAt(position + size++);\n // Closing Brace (})\n if (code === 0x007d) {\n // Must be at least 5 chars (\\u{0}) and encode a Unicode scalar value.\n if (size < 5 || !isUnicodeScalarValue(point)) {\n break;\n }\n return { value: String.fromCodePoint(point), size };\n }\n // Append this hex digit to the code point.\n point = (point << 4) | readHexDigit(code);\n if (point < 0) {\n break;\n }\n }\n\n throw syntaxError(\n lexer.source,\n position,\n `Invalid Unicode escape sequence: \"${body.slice(\n position,\n position + size,\n )}\".`,\n );\n}\n\nfunction readEscapedUnicodeFixedWidth(\n lexer: Lexer,\n position: number,\n): EscapeSequence {\n const body = lexer.source.body;\n const code = read16BitHexCode(body, position + 2);\n\n if (isUnicodeScalarValue(code)) {\n return { value: String.fromCodePoint(code), size: 6 };\n }\n\n // GraphQL allows JSON-style surrogate pair escape sequences, but only when\n // a valid pair is formed.\n if (isLeadingSurrogate(code)) {\n // \\u\n if (\n body.charCodeAt(position + 6) === 0x005c &&\n body.charCodeAt(position + 7) === 0x0075\n ) {\n const trailingCode = read16BitHexCode(body, position + 8);\n if (isTrailingSurrogate(trailingCode)) {\n // JavaScript defines strings as a sequence of UTF-16 code units and\n // encodes Unicode code points above U+FFFF using a surrogate pair of\n // code units. Since this is a surrogate pair escape sequence, just\n // include both codes into the JavaScript string value. Had JavaScript\n // not been internally based on UTF-16, then this surrogate pair would\n // be decoded to retrieve the supplementary code point.\n return { value: String.fromCodePoint(code, trailingCode), size: 12 };\n }\n }\n }\n\n throw syntaxError(\n lexer.source,\n position,\n `Invalid Unicode escape sequence: \"${body.slice(position, position + 6)}\".`,\n );\n}\n\n/**\n * Reads four hexadecimal characters and returns the positive integer that 16bit\n * hexadecimal string represents. For example, \"000f\" will return 15, and \"dead\"\n * will return 57005.\n *\n * Returns a negative number if any char was not a valid hexadecimal digit.\n *\n * @internal\n */\nfunction read16BitHexCode(body: string, position: number): number {\n // readHexDigit() returns -1 on error. ORing a negative value with any other\n // value always produces a negative value.\n return (\n (readHexDigit(body.charCodeAt(position)) << 12) |\n (readHexDigit(body.charCodeAt(position + 1)) << 8) |\n (readHexDigit(body.charCodeAt(position + 2)) << 4) |\n readHexDigit(body.charCodeAt(position + 3))\n );\n}\n\n/**\n * Reads a hexadecimal character and returns its positive integer value (0-15).\n *\n * '0' becomes 0, '9' becomes 9\n * 'A' becomes 10, 'F' becomes 15\n * 'a' becomes 10, 'f' becomes 15\n *\n * Returns -1 if the provided character code was not a valid hexadecimal digit.\n *\n * HexDigit :: one of\n * - `0` `1` `2` `3` `4` `5` `6` `7` `8` `9`\n * - `A` `B` `C` `D` `E` `F`\n * - `a` `b` `c` `d` `e` `f`\n *\n * @internal\n */\nfunction readHexDigit(code: number): number {\n return code >= 0x0030 && code <= 0x0039 // 0-9\n ? code - 0x0030\n : code >= 0x0041 && code <= 0x0046 // A-F\n ? code - 0x0037\n : code >= 0x0061 && code <= 0x0066 // a-f\n ? code - 0x0057\n : -1;\n}\n\n/**\n * | Escaped Character | Code Point | Character Name |\n * | ----------------- | ---------- | ---------------------------- |\n * | `\"` | U+0022 | double quote |\n * | `\\` | U+005C | reverse solidus (back slash) |\n * | `/` | U+002F | solidus (forward slash) |\n * | `b` | U+0008 | backspace |\n * | `f` | U+000C | form feed |\n * | `n` | U+000A | line feed (new line) |\n * | `r` | U+000D | carriage return |\n * | `t` | U+0009 | horizontal tab |\n *\n * @internal\n */\nfunction readEscapedCharacter(lexer: Lexer, position: number): EscapeSequence {\n const body = lexer.source.body;\n const code = body.charCodeAt(position + 1);\n switch (code) {\n case 0x0022: // \"\n return { value: '\\u0022', size: 2 };\n case 0x005c: // \\\n return { value: '\\u005c', size: 2 };\n case 0x002f: // /\n return { value: '\\u002f', size: 2 };\n case 0x0062: // b\n return { value: '\\u0008', size: 2 };\n case 0x0066: // f\n return { value: '\\u000c', size: 2 };\n case 0x006e: // n\n return { value: '\\u000a', size: 2 };\n case 0x0072: // r\n return { value: '\\u000d', size: 2 };\n case 0x0074: // t\n return { value: '\\u0009', size: 2 };\n }\n throw syntaxError(\n lexer.source,\n position,\n `Invalid character escape sequence: \"${body.slice(\n position,\n position + 2,\n )}\".`,\n );\n}\n\n/**\n * Reads a block string token from the source file.\n *\n * ```\n * StringValue ::\n * - `\"\"\"` BlockStringCharacter* `\"\"\"`\n *\n * BlockStringCharacter ::\n * - SourceCharacter but not `\"\"\"` or `\\\"\"\"`\n * - `\\\"\"\"`\n * ```\n *\n * @internal\n */\nfunction readBlockString(lexer: Lexer, start: number): Token {\n const body = lexer.source.body;\n const bodyLength = body.length;\n let lineStart = lexer.lineStart;\n\n let position = start + 3;\n let chunkStart = position;\n let currentLine = '';\n\n const blockLines = [];\n while (position < bodyLength) {\n const code = body.charCodeAt(position);\n\n // Closing Triple-Quote (\"\"\")\n if (\n code === 0x0022 &&\n body.charCodeAt(position + 1) === 0x0022 &&\n body.charCodeAt(position + 2) === 0x0022\n ) {\n currentLine += body.slice(chunkStart, position);\n blockLines.push(currentLine);\n\n const token = createToken(\n lexer,\n TokenKind.BLOCK_STRING,\n start,\n position + 3,\n // Return a string of the lines joined with U+000A.\n dedentBlockStringLines(blockLines).join('\\n'),\n );\n\n lexer.line += blockLines.length - 1;\n lexer.lineStart = lineStart;\n return token;\n }\n\n // Escaped Triple-Quote (\\\"\"\")\n if (\n code === 0x005c &&\n body.charCodeAt(position + 1) === 0x0022 &&\n body.charCodeAt(position + 2) === 0x0022 &&\n body.charCodeAt(position + 3) === 0x0022\n ) {\n currentLine += body.slice(chunkStart, position);\n chunkStart = position + 1; // skip only slash\n position += 4;\n continue;\n }\n\n // LineTerminator\n if (code === 0x000a || code === 0x000d) {\n currentLine += body.slice(chunkStart, position);\n blockLines.push(currentLine);\n\n if (code === 0x000d && body.charCodeAt(position + 1) === 0x000a) {\n position += 2;\n } else {\n ++position;\n }\n\n currentLine = '';\n chunkStart = position;\n lineStart = position;\n continue;\n }\n\n // SourceCharacter\n if (isUnicodeScalarValue(code)) {\n ++position;\n } else if (isSupplementaryCodePoint(body, position)) {\n position += 2;\n } else {\n throw syntaxError(\n lexer.source,\n position,\n `Invalid character within String: ${printCodePointAt(\n lexer,\n position,\n )}.`,\n );\n }\n }\n\n throw syntaxError(lexer.source, position, 'Unterminated string.');\n}\n\n/**\n * Reads an alphanumeric + underscore name from the source.\n *\n * ```\n * Name ::\n * - NameStart NameContinue* [lookahead != NameContinue]\n * ```\n *\n * @internal\n */\nexport function readName(lexer: LexerInterface, start: number): Token {\n const body = lexer.source.body;\n const bodyLength = body.length;\n let position = start + 1;\n\n while (position < bodyLength) {\n const code = body.charCodeAt(position);\n if (isNameContinue(code)) {\n ++position;\n } else {\n break;\n }\n }\n\n return createToken(\n lexer,\n TokenKind.NAME,\n start,\n position,\n body.slice(start, position),\n );\n}\n"]}