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import { Token } from './token.js';
import { isLetter, isDigit, isHexDigit, isWhitespace } from './char-flags.js';
import { SpelParseException } from '../error/spel-parse-exception.js';
import { SpelMessage } from '../error/spel-message.js';
/**
* Parallels Spring Tokenizer
*
* SpEL lexer: decomposes expression string into Token sequence.
* O(1) character type queries via character classification table.
*/
export class Tokenizer {
private readonly expression: string;
private pos = 0;
private readonly maxPos: number;
constructor(expression: string) {
this.expression = expression;
this.maxPos = expression.length;
}
/**
* Main lexical analysis loop — returns next Token
*/
public nextToken(): Token {
while (this.pos < this.maxPos) {
const ch = this.expression.charCodeAt(this.pos);
// Skip whitespace
if (isWhitespace(ch)) {
this.pos++;
continue;
}
// Identifier / keyword
if (isLetter(ch) || ch === 95 /* _ */ || ch === 36 /* $ */) {
return this.eatIdentifier();
}
// Number literal
if (isDigit(ch)) {
return this.eatNumberLiteral();
}
// String literal
if (ch === 39 /* ' */ || ch === 34 /* " */) {
return this.eatStringLiteral(ch);
}
// Operators and delimiters
return this.eatOperatorOrDelimiter();
}
return new Token(TokenKind.EOF, this.pos, this.pos);
}
/**
* Consume identifier or keyword
*/
private eatIdentifier(): Token {
const start = this.pos;
while (this.pos < this.maxPos) {
const ch = this.expression.charCodeAt(this.pos);
if (isLetter(ch) || isDigit(ch) || ch === 95 /* _ */ || ch === 36 /* $ */) {
this.pos++;
} else {
break;
}
}
const text = this.expression.slice(start, this.pos);
return this.identifierOrKeyword(start, text);
}
/**
* Classify identifier string as Token: keyword or plain identifier
*/
private identifierOrKeyword(start: number, text: string): Token {
switch (text) {
case 'null':
return new Token(TokenKind.LITERAL_NULL, start, this.pos, text, null);
case 'true':
return new Token(TokenKind.LITERAL_BOOLEAN, start, this.pos, text, true);
case 'false':
return new Token(TokenKind.LITERAL_BOOLEAN, start, this.pos, text, false);
case 'eq':
return new Token(TokenKind.EQ, start, this.pos, text);
case 'ne':
return new Token(TokenKind.NE, start, this.pos, text);
case 'lt':
return new Token(TokenKind.LT, start, this.pos, text);
case 'le':
return new Token(TokenKind.LE, start, this.pos, text);
case 'gt':
return new Token(TokenKind.GT, start, this.pos, text);
case 'ge':
return new Token(TokenKind.GE, start, this.pos, text);
case 'and':
return new Token(TokenKind.AND, start, this.pos, text);
case 'or':
return new Token(TokenKind.OR, start, this.pos, text);
case 'not':
return new Token(TokenKind.NOT, start, this.pos, text);
case 'mod':
return new Token(TokenKind.MOD, start, this.pos, text);
case 'matches':
return new Token(TokenKind.MATCHES, start, this.pos, text);
case 'between':
return new Token(TokenKind.BETWEEN, start, this.pos, text);
case 'instanceof':
return new Token(TokenKind.INSTANCEOF, start, this.pos, text);
case 'new':
return new Token(TokenKind.NEW, start, this.pos, text);
default:
return new Token(TokenKind.IDENTIFIER, start, this.pos, text);
}
}
/**
* Consume number literal (int, long, float, double, hex)
*/
private eatNumberLiteral(): Token {
const start = this.pos;
// Hexadecimal 0x or 0X
if (this.expression.charCodeAt(this.pos) === 48 /* '0' */ && this.pos + 1 < this.maxPos) {
const next = this.expression.charCodeAt(this.pos + 1);
if (next === 120 /* 'x' */ || next === 88 /* 'X' */) {
this.pos += 2;
while (this.pos < this.maxPos && isHexDigit(this.expression.charCodeAt(this.pos))) {
this.pos++;
}
const text = this.expression.slice(start, this.pos);
return new Token(TokenKind.LITERAL_HEX, start, this.pos, text, parseInt(text, 16));
}
// Octal: 0[0-7]+
if (next >= 48 /* '0' */ && next <= 55 /* '7' */) {
this.pos += 2;
while (this.pos < this.maxPos) {
const octCh = this.expression.charCodeAt(this.pos);
if (octCh >= 48 && octCh <= 55) {
this.pos++;
} else {
break;
}
}
const text = this.expression.slice(start, this.pos);
return new Token(TokenKind.LITERAL_INT, start, this.pos, text, parseInt(text, 8));
}
}
// Integer part
while (this.pos < this.maxPos && isDigit(this.expression.charCodeAt(this.pos))) {
this.pos++;
}
let isFloat = false;
// Fractional part
if (this.pos < this.maxPos && this.expression.charCodeAt(this.pos) === 46 /* '.' */) {
// Check not range operator ..
if (this.pos + 1 < this.maxPos && this.expression.charCodeAt(this.pos + 1) === 46) {
// This is .. operator, do not consume
} else {
isFloat = true;
this.pos++;
while (this.pos < this.maxPos && isDigit(this.expression.charCodeAt(this.pos))) {
this.pos++;
}
}
}
// Exponent part
if (this.pos < this.maxPos) {
const ch = this.expression.charCodeAt(this.pos);
if (ch === 69 /* 'E' */ || ch === 101 /* 'e' */) {
isFloat = true;
this.pos++;
if (this.pos < this.maxPos) {
const sign = this.expression.charCodeAt(this.pos);
if (sign === 43 /* '+' */ || sign === 45 /* '-' */) {
this.pos++;
}
}
while (this.pos < this.maxPos && isDigit(this.expression.charCodeAt(this.pos))) {
this.pos++;
}
}
}
// Suffix
let kind = TokenKind.LITERAL_INT;
if (this.pos < this.maxPos) {
const suffix = this.expression.charCodeAt(this.pos);
switch (suffix) {
case 76:
case 108: // 'L' 'l'
kind = TokenKind.LITERAL_LONG;
this.pos++;
break;
case 70:
case 102: // 'F' 'f'
kind = TokenKind.LITERAL_FLOAT;
this.pos++;
break;
case 68:
case 100: // 'D' 'd'
kind = TokenKind.LITERAL_DOUBLE;
this.pos++;
break;
default:
if (isFloat) {
kind = TokenKind.LITERAL_DOUBLE;
}
break;
}
} else if (isFloat) {
kind = TokenKind.LITERAL_DOUBLE;
}
const text = this.expression.slice(start, this.pos);
const value =
kind === TokenKind.LITERAL_INT || kind === TokenKind.LITERAL_LONG
? parseInt(text, 10)
: parseFloat(text);
return new Token(kind, start, this.pos, text, value);
}
/**
* Consume string literal (supports '' escaping)
*/
private eatStringLiteral(quote: number): Token {
const start = this.pos;
const quoteChar = String.fromCharCode(quote);
this.pos++; // Skip opening quote
const parts: string[] = [];
let foundClosingQuote = false;
while (this.pos < this.maxPos) {
const ch = this.expression.charCodeAt(this.pos);
if (ch === quote) {
// Check for escaped quote '' or ""
if (this.pos + 1 < this.maxPos && this.expression.charCodeAt(this.pos + 1) === quote) {
parts.push(quoteChar);
this.pos += 2; // Skip two quotes
} else {
this.pos++; // Skip closing quote
foundClosingQuote = true;
break;
}
} else {
parts.push(this.expression[this.pos]!);
this.pos++;
}
}
// Check if end of expression reached without closing string
if (!foundClosingQuote) {
throw new SpelParseException(start, SpelMessage.UNTERMINATED_STRING_LITERAL);
}
const value = parts.join('');
const raw = this.expression.slice(start, this.pos);
return new Token(TokenKind.LITERAL_STRING, start, this.pos, raw, value);
}
/**
* Consume operators and delimiters — core multi-char matching
*/
private eatOperatorOrDelimiter(): Token {
const start = this.pos;
const ch = this.expression.charCodeAt(this.pos);
this.pos++; // Consume one character first
switch (ch) {
// Single character
case 42: // *
if (this.matchNext(42)) {
// **
this.pos++;
return new Token(TokenKind.POWER, start, this.pos, '**');
}
return new Token(TokenKind.STAR, start, this.pos, '*');
case 43: // +
if (this.matchNext(43)) {
// ++
this.pos++;
return new Token(TokenKind.INC, start, this.pos, '++');
}
return new Token(TokenKind.PLUS, start, this.pos, '+');
case 45: // -
if (this.matchNext(45)) {
// --
this.pos++;
return new Token(TokenKind.DEC, start, this.pos, '--');
}
return new Token(TokenKind.MINUS, start, this.pos, '-');
case 47:
return new Token(TokenKind.SLASH, start, this.pos, '/'); // /
case 37:
return new Token(TokenKind.PERCENT, start, this.pos, '%'); // %
case 94:
return new Token(TokenKind.POWER, start, this.pos, '^'); // ^
case 40:
return new Token(TokenKind.LPAREN, start, this.pos, '('); // (
case 41:
return new Token(TokenKind.RPAREN, start, this.pos, ')'); // )
case 91:
return new Token(TokenKind.LBRACKET, start, this.pos, '['); // [
case 93:
return new Token(TokenKind.RBRACKET, start, this.pos, ']'); // ]
case 123:
return new Token(TokenKind.LBRACE, start, this.pos, '{'); // {
case 125:
return new Token(TokenKind.RBRACE, start, this.pos, '}'); // }
case 44:
return new Token(TokenKind.COMMA, start, this.pos, ','); // ,
case 58:
return new Token(TokenKind.COLON, start, this.pos, ':'); // :
case 35:
return new Token(TokenKind.HASH, start, this.pos, '#'); // #
case 64:
return new Token(TokenKind.AT, start, this.pos, '@'); // @
case 33: {
// !
if (this.matchNext(61)) {
// !=
this.pos++;
return new Token(TokenKind.NE, start, this.pos, '!=');
}
return new Token(TokenKind.NOT, start, this.pos, '!');
}
case 61: {
// =
if (this.matchNext(61)) {
// ==
this.pos++;
return new Token(TokenKind.EQ, start, this.pos, '==');
}
return new Token(TokenKind.ASSIGN, start, this.pos, '=');
}
case 60: {
// <
if (this.matchNext(61)) {
// <=
this.pos++;
return new Token(TokenKind.LE, start, this.pos, '<=');
}
return new Token(TokenKind.LT, start, this.pos, '<');
}
case 62: {
// >
if (this.matchNext(61)) {
// >=
this.pos++;
return new Token(TokenKind.GE, start, this.pos, '>=');
}
return new Token(TokenKind.GT, start, this.pos, '>');
}
case 38: {
// &
if (this.matchNext(38)) {
// &&
this.pos++;
return new Token(TokenKind.AND, start, this.pos, '&&');
}
if (this.matchNext(64)) {
// &@
this.pos++;
return new Token(TokenKind.AMP_AT, start, this.pos, '&@');
}
throw new SpelParseException(SpelMessage.NOT_VALID_CHAR, start, '&');
}
case 124: {
// |
if (this.matchNext(124)) {
// ||
this.pos++;
return new Token(TokenKind.OR, start, this.pos, '||');
}
throw new SpelParseException(SpelMessage.NOT_VALID_CHAR, start, '|');
}
case 63: {
// ?
if (this.matchNext(46)) {
// ?.
this.pos++;
return new Token(TokenKind.SAFE_NAV, start, this.pos, '?.');
}
if (this.matchNext(58)) {
// ?:
this.pos++;
return new Token(TokenKind.ELVIS, start, this.pos, '?:');
}
return new Token(TokenKind.QMARK, start, this.pos, '?');
}
case 46: {
// .
// Check for .![ .?[ .$[ .^[ .*[ or ..
if (this.pos < this.maxPos) {
const next = this.expression.charCodeAt(this.pos);
if (next === 46) {
// ..
this.pos++;
return new Token(TokenKind.DOTDOT, start, this.pos, '..');
}
if (next === 33 /* '!' */) {
if (
this.pos + 1 < this.maxPos &&
this.expression.charCodeAt(this.pos + 1) === 91 /* '[' */
) {
this.pos += 2;
return new Token(TokenKind.PROJECTION, start, this.pos, '.![');
}
}
if (next === 63 /* '?' */) {
if (
this.pos + 1 < this.maxPos &&
this.expression.charCodeAt(this.pos + 1) === 91 /* '[' */
) {
this.pos += 2;
return new Token(TokenKind.SELECTION, start, this.pos, '.?[');
}
}
if (next === 36 /* '$' */ || next === 94 /* '^' */) {
if (
this.pos + 1 < this.maxPos &&
this.expression.charCodeAt(this.pos + 1) === 91 /* '[' */
) {
this.pos += 2;
return new Token(
TokenKind.SELECT_FIRST,
start,
this.pos,
this.expression.slice(start, this.pos),
);
}
}
if (next === 42 /* '*' */) {
if (
this.pos + 1 < this.maxPos &&
this.expression.charCodeAt(this.pos + 1) === 91 /* '[' */
) {
this.pos += 2;
return new Token(TokenKind.SELECT_LAST, start, this.pos, '.*[');
}
}
}
return new Token(TokenKind.DOT, start, this.pos, '.');
}
default:
throw new SpelParseException(SpelMessage.NOT_VALID_CHAR, start, String.fromCharCode(ch));
}
}
/**
* Check if current position character matches expected
*/
private matchNext(expected: number): boolean {
return this.pos < this.maxPos && this.expression.charCodeAt(this.pos) === expected;
}
/**
* Get all tokens (for debugging and testing)
*/
public tokenize(): Token[] {
const tokens: Token[] = [];
let token: Token;
while ((token = this.nextToken()).kind !== TokenKind.EOF) {
tokens.push(token);
}
tokens.push(token); // Include EOF
return tokens;
}
}
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