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import { SpelExpression } from './spel-expression.js';
import type { SpelNodeImpl } from './ast/spel-node.js';
import { Tokenizer } from './tokenizer/tokenizer.js';
import { Token } from './tokenizer/token.js';
import { TokenKind } from './tokenizer/token-kind.js';
import { SpelParseException } from './error/spel-parse-exception.js';
import { SpelMessage } from './error/spel-message.js';
// AST Literal Nodes
import { NullLiteral } from './ast/literal/null-literal.js';
import { BooleanLiteral } from './ast/literal/boolean-literal.js';
import { IntLiteral } from './ast/literal/int-literal.js';
import { LongLiteral } from './ast/literal/long-literal.js';
import { RealLiteral } from './ast/literal/real-literal.js';
import { FloatLiteral } from './ast/literal/float-literal.js';
import { StringLiteral } from './ast/literal/string-literal.js';
// AST Reference Nodes
import { CompoundExpression } from './ast/reference/compound-expression.js';
import { VariableReference } from './ast/reference/variable-reference.js';
import { PropertyOrFieldReference } from './ast/reference/property-or-field-reference.js';
import { Indexer } from './ast/reference/indexer.js';
import { MethodReference } from './ast/reference/method-reference.js';
import { ConstructorReference } from './ast/reference/constructor-reference.js';
import { BeanReference } from './ast/reference/bean-reference.js';
import { TypeReference } from './ast/reference/type-reference.js';
// AST Control Flow Nodes
import { Ternary } from './ast/control-flow/ternary.js';
import { Elvis } from './ast/control-flow/elvis.js';
import { Assign } from './ast/control-flow/assign.js';
// AST Collection Nodes
import { InlineList } from './ast/collection/inline-list.js';
import { InlineMap } from './ast/collection/inline-map.js';
import { Selection, SelectMode } from './ast/collection/selection.js';
import { Projection } from './ast/collection/projection.js';
// AST Operator Nodes
import { OpPlus } from './ast/operator/op-plus.js';
import { OpMinus } from './ast/operator/op-minus.js';
import { OpMultiply } from './ast/operator/op-multiply.js';
import { OpDivide } from './ast/operator/op-divide.js';
import { OpModulus } from './ast/operator/op-modulus.js';
import { OpPower } from './ast/operator/op-power.js';
import { RangeOperator } from './ast/operator/range-operator.js';
import { OpEQ } from './ast/operator/op-eq.js';
import { OpNE } from './ast/operator/op-ne.js';
import { OpLT } from './ast/operator/op-lt.js';
import { OpLE } from './ast/operator/op-le.js';
import { OpGT } from './ast/operator/op-gt.js';
import { OpGE } from './ast/operator/op-ge.js';
import { OpAnd } from './ast/operator/op-and.js';
import { OpOr } from './ast/operator/op-or.js';
import { OpNot } from './ast/operator/op-not.js';
import { OpMatches } from './ast/operator/op-matches.js';
import { OpBetween } from './ast/operator/op-between.js';
import { OpInstanceof } from './ast/operator/op-instanceof.js';
import { OpInc } from './ast/operator/op-inc.js';
import { OpDec } from './ast/operator/op-dec.js';
/**
* Parallels Spring SpelExpressionParser — public API entry point
*/
export class SpelExpressionParser {
constructor(configuration?: SpelParserConfiguration) {
// configuration is accepted for Spring API compatibility;
// currently unused as all expressions are parsed with defaults.
void configuration;
}
public parseExpression(expressionString: string): SpelExpression {
const parser = new InternalSpelExpressionParser(expressionString);
const ast = parser.parse();
return new SpelExpression(expressionString, ast);
}
public parseRaw(expressionString: string): SpelNodeImpl {
const parser = new InternalSpelExpressionParser(expressionString);
return parser.parse();
}
}
/**
* Parallels Spring InternalSpelExpressionParser
*
* Recursive descent parser — following Spring SpEL operator precedence chain:
* Assignment → Conditional → Or → And → Equality → Relational
* → Additive → Multiplicative → Power → Unary → Primary
*/
export class InternalSpelExpressionParser {
private tokens: Token[] = [];
private pos = 0;
private readonly expressionString: string;
constructor(expressionString: string) {
this.expressionString = expressionString;
}
// ==================== ENTRY ====================
public parse(): SpelNodeImpl {
this.tokens = new Tokenizer(this.expressionString).tokenize();
const result = this.eatExpression();
this.expect(TokenKind.EOF);
return result;
}
// ==================== PRECEDENCE LEVEL 1: Assignment ====================
/**
* expression := conditional_expression ('=' expression)?
*/
private eatExpression(): SpelNodeImpl {
const left = this.eatConditionalExpression();
// Assignment = lowest precedence, right-associative
if (this.peek().kind === TokenKind.ASSIGN) {
const assignToken = this.advance();
const right = this.eatExpression();
return new Assign(assignToken.startPos, right.endPos, left, right);
}
return left;
}
// ==================== PRECEDENCE LEVEL 2: Conditional ====================
/**
* conditional_expression := or_expression
* ('?' expression ':' conditional_expression)?
* ('?:' expression)?
*/
private eatConditionalExpression(): SpelNodeImpl {
const left = this.eatOrExpression();
// Elvis: ?: (standalone token, not ? followed by :)
if (this.peek().kind === TokenKind.ELVIS) {
const elvisToken = this.advance();
const right = this.eatConditionalExpression();
return new Elvis(elvisToken.startPos, right.endPos, left, right);
}
// Ternary: ? expr : expr
if (this.peek().kind === TokenKind.QMARK) {
this.advance(); // consume '?'
const trueExpr = this.eatExpression();
this.expect(TokenKind.COLON);
const falseExpr = this.eatConditionalExpression();
return new Ternary(left.startPos, falseExpr.endPos, left, trueExpr, falseExpr);
}
return left;
}
// ==================== PRECEDENCE LEVEL 3: Logical OR ====================
/**
* or_expression := and_expression ('or' / '||' and_expression)*
*/
private eatOrExpression(): SpelNodeImpl {
let left = this.eatAndExpression();
while (this.peek().kind === TokenKind.OR) {
const opToken = this.advance();
const right = this.eatAndExpression();
left = new OpOr('||', opToken.startPos, right.endPos, left, right);
}
return left;
}
// ==================== PRECEDENCE LEVEL 4: Logical AND ====================
/**
* and_expression := relational_expression ('and' / '&&' relational_expression)*
*/
private eatAndExpression(): SpelNodeImpl {
let left = this.eatRelationalExpression();
while (this.peek().kind === TokenKind.AND) {
const opToken = this.advance();
const right = this.eatRelationalExpression();
left = new OpAnd('&&', opToken.startPos, right.endPos, left, right);
}
return left;
}
// ==================== PRECEDENCE LEVEL 5: Relational ====================
/**
* relational_expression := sum_expression
* ( '=='/'eq' | '!='/'ne' | '<'/'lt' | '<='/'le'
* | '>'/'gt' | '>='/'ge' | 'matches' | 'between' | 'instanceof'
* ) sum_expression
* | sum_expression 'between' sum_expression 'and' sum_expression
* | sum_expression 'instanceof' sum_expression
*/
private eatRelationalExpression(): SpelNodeImpl {
const left = this.eatSumExpression();
// Range operator: a..b
if (this.peek().kind === TokenKind.DOTDOT) {
const dotdotToken = this.advance();
const right = this.eatSumExpression();
return new RangeOperator(dotdotToken.startPos, right.endPos, left, right);
}
const kind = this.peek().kind;
if (this.isRelationalOp(kind)) {
const opToken = this.advance();
const right = this.eatSumExpression();
return this.buildRelationalOp(opToken, left, right);
}
// 'between' has two forms:
// 1. value between {lower, upper} (list form)
// 2. value between lower and upper (and form)
if (kind === TokenKind.BETWEEN) {
const betweenToken = this.advance();
// Check if next is inline list: {lower, upper}
if (this.peek().kind === TokenKind.LBRACE) {
const savedPos = this.pos;
this.advance(); // consume '{'
if (this.peek().kind !== TokenKind.RBRACE) {
const lower = this.eatExpression();
if (this.peek().kind === TokenKind.COMMA) {
this.advance(); // consume ','
const upper = this.eatExpression();
if (this.peek().kind === TokenKind.RBRACE) {
this.advance(); // consume '}'
return new OpBetween('between', betweenToken.startPos, this.pos, left, lower, upper);
}
}
}
// Not a 2-element list — backtrack
this.pos = savedPos;
}
// Form 2: value between lower and upper
const lower = this.eatSumExpression();
if (this.peek().kind === TokenKind.AND) {
this.advance(); // consume 'and'
}
const upper = this.eatSumExpression();
return new OpBetween('between', betweenToken.startPos, upper.endPos, left, lower, upper);
}
return left;
}
private isRelationalOp(kind: TokenKind): boolean {
return (
kind === TokenKind.EQ ||
kind === TokenKind.NE ||
kind === TokenKind.LT ||
kind === TokenKind.LE ||
kind === TokenKind.GT ||
kind === TokenKind.GE ||
kind === TokenKind.MATCHES ||
kind === TokenKind.INSTANCEOF
);
}
private buildRelationalOp(opToken: Token, left: SpelNodeImpl, right: SpelNodeImpl): SpelNodeImpl {
switch (opToken.kind) {
case TokenKind.EQ:
return new OpEQ('==', opToken.startPos, right.endPos, left, right);
case TokenKind.NE:
return new OpNE('!=', opToken.startPos, right.endPos, left, right);
case TokenKind.LT:
return new OpLT('<', opToken.startPos, right.endPos, left, right);
case TokenKind.LE:
return new OpLE('<=', opToken.startPos, right.endPos, left, right);
case TokenKind.GT:
return new OpGT('>', opToken.startPos, right.endPos, left, right);
case TokenKind.GE:
return new OpGE('>=', opToken.startPos, right.endPos, left, right);
case TokenKind.MATCHES:
return new OpMatches('matches', opToken.startPos, right.endPos, left, right);
case TokenKind.INSTANCEOF:
return new OpInstanceof('instanceof', opToken.startPos, right.endPos, left, right);
default:
throw this.raise(SpelMessage.OODES, TokenKind[opToken.kind]);
}
}
// ==================== PRECEDENCE LEVEL 6: Additive ====================
/**
* sum_expression := product_expression (('+' | '-') product_expression)*
*/
private eatSumExpression(): SpelNodeImpl {
let left = this.eatProductExpression();
while (this.peek().kind === TokenKind.PLUS || this.peek().kind === TokenKind.MINUS) {
const opToken = this.advance();
const right = this.eatProductExpression();
if (opToken.kind === TokenKind.PLUS) {
left = new OpPlus('+', opToken.startPos, right.endPos, left, right);
} else {
left = new OpMinus('-', opToken.startPos, right.endPos, left, right);
}
}
return left;
}
// ==================== PRECEDENCE LEVEL 7: Multiplicative ====================
/**
* product_expression := power_expression
* (('*' | '/' | '%' | 'mod') power_expression)*
*/
private eatProductExpression(): SpelNodeImpl {
let left = this.eatPowerExpression();
while (true) {
const kind = this.peek().kind;
if (
kind !== TokenKind.STAR &&
kind !== TokenKind.SLASH &&
kind !== TokenKind.PERCENT &&
kind !== TokenKind.MOD
) {
break;
}
const opToken = this.advance();
const right = this.eatPowerExpression();
switch (opToken.kind) {
case TokenKind.STAR:
left = new OpMultiply('*', opToken.startPos, right.endPos, left, right);
break;
case TokenKind.SLASH:
left = new OpDivide('/', opToken.startPos, right.endPos, left, right);
break;
default:
left = new OpModulus('%', opToken.startPos, right.endPos, left, right);
break;
}
}
return left;
}
// ==================== PRECEDENCE LEVEL 8: Power ====================
/**
* power_expression := unary_expression ('^' / '**' power_expression)?
*
* Power is right-associative.
*/
private eatPowerExpression(): SpelNodeImpl {
const left = this.eatUnaryExpression();
if (this.peek().kind === TokenKind.POWER) {
const opToken = this.advance();
const right = this.eatPowerExpression(); // right-associative
return new OpPower('^', opToken.startPos, right.endPos, left, right);
}
return left;
}
// ==================== PRECEDENCE LEVEL 9: Unary ====================
/**
* unary_expression := ('-' | '+' | '!' | 'not') unary_expression
* | ('++' | '--') primary_expression
* | primary_expression ('++' | '--')?
* | primary_expression
*/
private eatUnaryExpression(): SpelNodeImpl {
const kind = this.peek().kind;
// Prefix: -expr
if (kind === TokenKind.MINUS) {
const opToken = this.advance();
const operand = this.eatUnaryExpression();
return new OpMinus(
'-',
opToken.startPos,
operand.endPos,
new NullLiteral(opToken.startPos, opToken.endPos),
operand,
);
}
// Prefix: +expr (no-op, just return operand)
if (kind === TokenKind.PLUS) {
this.advance();
return this.eatUnaryExpression();
}
// Prefix: !expr / not expr
if (kind === TokenKind.NOT) {
const opToken = this.advance();
const operand = this.eatUnaryExpression();
return new OpNot('!', opToken.startPos, operand.endPos, operand);
}
// Prefix: ++expr
if (kind === TokenKind.INC) {
const opToken = this.advance();
const operand = this.eatUnaryExpression();
return new OpInc('++', opToken.startPos, operand.endPos, operand);
}
// Prefix: --expr
if (kind === TokenKind.DEC) {
const opToken = this.advance();
const operand = this.eatUnaryExpression();
return new OpDec('--', opToken.startPos, operand.endPos, operand);
}
return this.eatPostfixOrPrimary();
}
/**
* Postfix: primary (++ | -- | .identifier | .selector | [index] | (args))
*/
private eatPostfixOrPrimary(): SpelNodeImpl {
let node = this.eatPrimaryExpression();
while (true) {
const kind = this.peek().kind;
// Postfix: expr++
if (kind === TokenKind.INC) {
const opToken = this.advance();
node = new OpInc('++', opToken.startPos, opToken.endPos, node);
continue;
}
// Postfix: expr--
if (kind === TokenKind.DEC) {
const opToken = this.advance();
node = new OpDec('--', opToken.startPos, opToken.endPos, node);
continue;
}
// Property access: expr.identifier / expr.?identifier
if (
kind === TokenKind.DOT ||
kind === TokenKind.SAFE_NAV ||
kind === TokenKind.SELECTION ||
kind === TokenKind.PROJECTION ||
kind === TokenKind.SELECT_FIRST ||
kind === TokenKind.SELECT_LAST
) {
// Handle selection/projection directly as combined tokens (e.g., .?[)
if (
kind === TokenKind.SELECTION ||
kind === TokenKind.PROJECTION ||
kind === TokenKind.SELECT_FIRST ||
kind === TokenKind.SELECT_LAST
) {
const selToken = this.advance();
let predicate: SpelNodeImpl;
if (this.peek().kind !== TokenKind.RBRACKET) {
predicate = this.eatExpression();
} else {
predicate = new BooleanLiteral(selToken.startPos, selToken.startPos, true);
}
this.expect(TokenKind.RBRACKET);
if (kind === TokenKind.PROJECTION) {
node = new Projection(selToken.startPos, this.pos, false, node, predicate);
} else {
const mode =
kind === TokenKind.SELECT_FIRST
? SelectMode.FIRST
: kind === TokenKind.SELECT_LAST
? SelectMode.LAST
: SelectMode.ALL;
node = new Selection(selToken.startPos, this.pos, false, node, predicate, mode);
}
continue;
}
const dotToken = this.advance();
const nullSafe = dotToken.kind === TokenKind.SAFE_NAV;
const nextToken = this.peek();
if (nextToken.kind === TokenKind.IDENTIFIER) {
this.advance();
let nextNode: SpelNodeImpl = new PropertyOrFieldReference(
nextToken.startPos,
nextToken.endPos,
nextToken.literal!,
);
if (nullSafe && nextNode instanceof PropertyOrFieldReference) {
nextNode.nullSafe = true;
}
// Check for [index] or (args) after property name
if (this.peek().kind === TokenKind.LBRACKET) {
this.advance();
const idx = this.eatExpression();
this.expect(TokenKind.RBRACKET);
nextNode = new Indexer(nextNode.startPos, this.pos, nextNode, idx);
} else if (this.peek().kind === TokenKind.LPAREN) {
nextNode = this.eatMethodCallForName(nextToken.startPos, nextToken.literal!);
}
node = new CompoundExpression(node.startPos, nextNode.endPos, node, nextNode);
continue;
}
// .?[ or .![ or .$[ etc. — selection/projection
if (
nextToken.kind === TokenKind.SELECTION ||
nextToken.kind === TokenKind.PROJECTION ||
nextToken.kind === TokenKind.SELECT_FIRST ||
nextToken.kind === TokenKind.SELECT_LAST
) {
const selToken = this.advance();
// The SELECTION/PROJECTION token already consumed the '.?[' prefix
// eat predicate up to ']'
let predicate: SpelNodeImpl;
if (this.peek().kind !== TokenKind.RBRACKET) {
predicate = this.eatExpression();
} else {
predicate = new BooleanLiteral(nextToken.startPos, nextToken.startPos, true);
}
this.expect(TokenKind.RBRACKET);
if (selToken.kind === TokenKind.PROJECTION) {
node = new Projection(selToken.startPos, this.pos, false, node, predicate);
} else {
const mode =
selToken.kind === TokenKind.SELECT_FIRST
? SelectMode.FIRST
: selToken.kind === TokenKind.SELECT_LAST
? SelectMode.LAST
: SelectMode.ALL;
node = new Selection(selToken.startPos, this.pos, false, node, predicate, mode);
}
continue;
}
throw this.raise(SpelMessage.OODES, 'identifier expected after dot');
}
// Indexer: expr[index]
if (kind === TokenKind.LBRACKET) {
this.advance();
const indexExpr = this.eatExpression();
this.expect(TokenKind.RBRACKET);
node = new Indexer(node.startPos, this.pos, node, indexExpr);
continue;
}
// Method call: expr(args)
if (kind === TokenKind.LPAREN) {
this.advance();
const args = this.eatExpressionList();
this.expect(TokenKind.RPAREN);
// If node is PropertyOrFieldReference, extract name
if (node instanceof PropertyOrFieldReference) {
const name = node.toStringAST();
node = new MethodReference(node.startPos, this.pos, name, ...args);
} else {
// Anonymous lambda call or method ref on expression
node = new MethodReference(node.startPos, this.pos, node.toStringAST(), ...args);
}
continue;
}
break;
}
return node;
}
// ==================== PRIMARY ====================
/**
* primary_expression := literal | #var | #func() | @bean | T(type)
* | new Type(args) | { ... } | ( expr ) | identifier
*/
private eatPrimaryExpression(): SpelNodeImpl {
const token = this.peek();
switch (token.kind) {
// Literals
case TokenKind.LITERAL_NULL:
this.advance();
return new NullLiteral(token.startPos, token.endPos);
case TokenKind.LITERAL_BOOLEAN:
this.advance();
return new BooleanLiteral(token.startPos, token.endPos, token.payload as boolean);
case TokenKind.LITERAL_INT:
this.advance();
return new IntLiteral(token.startPos, token.endPos, token.payload as number);
case TokenKind.LITERAL_LONG:
this.advance();
return new LongLiteral(token.startPos, token.endPos, token.payload as number);
case TokenKind.LITERAL_DOUBLE:
this.advance();
return new RealLiteral(token.startPos, token.endPos, token.payload as number);
case TokenKind.LITERAL_FLOAT:
this.advance();
return new FloatLiteral(token.startPos, token.endPos, token.payload as number);
case TokenKind.LITERAL_STRING:
this.advance();
return new StringLiteral(token.startPos, token.endPos, token.payload as string);
case TokenKind.LITERAL_HEX:
this.advance();
return new IntLiteral(token.startPos, token.endPos, token.payload as number);
// Variable or function: #var or #func(args)
case TokenKind.HASH: {
return this.eatVariableOrFunction();
}
// Bean reference: @bean or &@factoryBean
case TokenKind.AT:
case TokenKind.AMP_AT: {
return this.eatBeanReference();
}
// Grouping: (expr)
case TokenKind.LPAREN: {
this.advance();
const expr = this.eatExpression();
this.expect(TokenKind.RPAREN);
return expr;
}
// Inline list or map: {a, b, c} or {key: value}
case TokenKind.LBRACE: {
return this.eatInlineCollection();
}
// Identifier — may be T(type), new, or compound expression
case TokenKind.IDENTIFIER: {
return this.eatIdentifierStart();
}
case TokenKind.NEW: {
return this.eatConstructorReference();
}
default:
throw this.raise(SpelMessage.OODES, token.literal!);
}
}
/**
* Eat identifier-based expressions: identifier | T(type) | new Type
*/
private eatIdentifierStart(): SpelNodeImpl {
const token = this.peek();
if (token.kind !== TokenKind.IDENTIFIER) {
throw this.raise(SpelMessage.OODES, token.literal!);
}
// T(Type) type reference
if (token.literal === 'T' || token.literal === 't') {
const savedPos = this.pos;
this.advance();
if (this.peek().kind === TokenKind.LPAREN) {
return this.eatTypeReference();
}
// Not T(...), backtrack to normal identifier
this.pos = savedPos;
}
return this.eatCompoundExpression();
}
/**
* Compound expression: identifier (.identifier | .?identifier | [index] | (args) )*
*/
private eatCompoundExpression(): SpelNodeImpl {
const startToken = this.peek();
if (startToken.kind !== TokenKind.IDENTIFIER) {
throw this.raise(SpelMessage.OODES, startToken.literal!);
}
this.advance();
const startPos = startToken.startPos;
let node: SpelNodeImpl = new PropertyOrFieldReference(
startToken.startPos,
startToken.endPos,
startToken.literal!,
);
// Check for method call: name(args)
if (this.peek().kind === TokenKind.LPAREN) {
node = this.eatMethodCallForName(startPos, startToken.literal!);
}
// Postfix chain: .prop / ?.prop / [index]
while (true) {
const kind = this.peek().kind;
if (kind === TokenKind.DOT || kind === TokenKind.SAFE_NAV) {
const dotToken = this.advance();
const nullSafe = dotToken.kind === TokenKind.SAFE_NAV;
const nextToken = this.peek();
if (nextToken.kind === TokenKind.IDENTIFIER) {
this.advance();
let nextNode: SpelNodeImpl = new PropertyOrFieldReference(
nextToken.startPos,
nextToken.endPos,
nextToken.literal!,
);
if (nullSafe && nextNode instanceof PropertyOrFieldReference) {
nextNode.nullSafe = true;
}
// Check for [index] or (args) after property name
if (this.peek().kind === TokenKind.LBRACKET) {
this.advance();
const idx = this.eatExpression();
this.expect(TokenKind.RBRACKET);
nextNode = new Indexer(nextNode.startPos, this.pos, nextNode, idx);
} else if (this.peek().kind === TokenKind.LPAREN) {
nextNode = this.eatMethodCallForName(nextToken.startPos, nextToken.literal!);
}
node = new CompoundExpression(node.startPos, nextNode.endPos, node, nextNode);
continue;
}
// Selection/Projection: .?[predicate] / .![projection]
if (
nextToken.kind === TokenKind.SELECTION ||
nextToken.kind === TokenKind.PROJECTION ||
nextToken.kind === TokenKind.SELECT_FIRST ||
nextToken.kind === TokenKind.SELECT_LAST
) {
const selToken = this.advance();
this.advance(); // Skip the consumed '['
// The SELECTION/PROJECTION token already consumed '.?[' — eat predicate up to ']'
let predicate: SpelNodeImpl;
if (this.peek().kind !== TokenKind.RBRACKET) {
predicate = this.eatExpression();
} else {
predicate = new BooleanLiteral(nextToken.startPos, nextToken.startPos, true);
}
this.expect(TokenKind.RBRACKET);
if (selToken.kind === TokenKind.PROJECTION) {
node = new Projection(selToken.startPos, this.pos, false, node, predicate);
} else {
const mode =
selToken.kind === TokenKind.SELECT_FIRST
? SelectMode.FIRST
: selToken.kind === TokenKind.SELECT_LAST
? SelectMode.LAST
: SelectMode.ALL;
node = new Selection(selToken.startPos, this.pos, false, node, predicate, mode);
}
continue;
}
throw this.raise(SpelMessage.OODES, 'identifier or selector expected after dot');
}
// Indexer after expression: expr[index]
if (kind === TokenKind.LBRACKET) {
this.advance();
const idx = this.eatExpression();
this.expect(TokenKind.RBRACKET);
node = new Indexer(node.startPos, this.pos, node, idx);
continue;
}
break;
}
return node;
}
private eatMethodCallForName(startPos: number, name: string): SpelNodeImpl {
this.advance(); // consume '('
const args = this.eatExpressionList();
this.expect(TokenKind.RPAREN);
return new MethodReference(startPos, this.pos, name, ...args);
}
// ==================== VARIABLE / FUNCTION ====================
/**
* #var or #func(args)
*/
private eatVariableOrFunction(): SpelNodeImpl {
const hashToken = this.advance(); // '#'
const nameToken = this.expect(TokenKind.IDENTIFIER);
const name = nameToken.literal!;
// Function call: #func(arg1, arg2)
if (this.peek().kind === TokenKind.LPAREN) {
this.advance();
const args = this.eatExpressionList();
this.expect(TokenKind.RPAREN);
return new MethodReference(hashToken.startPos, this.pos, name, ...args);
}
return new VariableReference(hashToken.startPos, nameToken.endPos, name);
}
// ==================== BEAN ====================
/**
* @bean or &@factoryBean
*/
private eatBeanReference(): SpelNodeImpl {
const atToken = this.advance();
// &@ factory bean prefix
let isFactoryBean = false;
if (atToken.kind === TokenKind.AMP_AT) {
isFactoryBean = true;
}
const nameToken = this.expect(TokenKind.IDENTIFIER);
// Check for method call: @bean.method(args)
if (this.peek().kind === TokenKind.DOT) {
this.advance();
const methodToken = this.expect(TokenKind.IDENTIFIER);
if (this.peek().kind === TokenKind.LPAREN) {
this.advance();
const args = this.eatExpressionList();
this.expect(TokenKind.RPAREN);
// Build: #beanRef.name.method => @bean name accessed via bean resolver then method called
// For Phase 2, return as compound: beanRef.method(args)
const beanRef = new BeanReference(
atToken.startPos,
nameToken.endPos,
nameToken.literal!,
isFactoryBean,
);
const methodRef = new MethodReference(
methodToken.startPos,
this.pos,
methodToken.literal!,
...args,
);
return new CompoundExpression(atToken.startPos, this.pos, beanRef, methodRef);
}
// @bean.property
const beanRef = new BeanReference(
atToken.startPos,
nameToken.endPos,
nameToken.literal!,
isFactoryBean,
);
const propRef = new PropertyOrFieldReference(
methodToken.startPos,
methodToken.endPos,
methodToken.literal!,
);
return new CompoundExpression(atToken.startPos, this.pos, beanRef, propRef);
}
return new BeanReference(atToken.startPos, nameToken.endPos, nameToken.literal!, isFactoryBean);
}
// ==================== TYPE ====================
/**
* T(Type) type reference
*/
private eatTypeReference(): SpelNodeImpl {
this.advance(); // consume '(' after T
const typeName = this.eatQualifiedIdentifier();
this.expect(TokenKind.RPAREN);
return new TypeReference(this.pos, this.pos, typeName);
}
/**
* new Type(args...) constructor reference
*/
private eatConstructorReference(): SpelNodeImpl {
const newToken = this.advance(); // consume 'new'
const typeToken = this.expect(TokenKind.IDENTIFIER);
// Read qualified type name: java.lang.String
let className = typeToken.literal!;
while (this.peek().kind === TokenKind.DOT) {
this.advance();
const next = this.advance();
className += `.${next.literal!}`;
}
const args: SpelNodeImpl[] = [];
if (this.peek().kind === TokenKind.LPAREN) {
this.advance();
if (this.peek().kind !== TokenKind.RPAREN) {
args.push(...this.eatExpressionList());
}
this.expect(TokenKind.RPAREN);
}
return new ConstructorReference(newToken.startPos, this.pos, className, ...args);
}
// ==================== COLLECTION ====================
/**
* { expr, expr, ... } or { key: value, key: value, ... }
*/
private eatInlineCollection(): SpelNodeImpl {
const start = this.advance().startPos; // consume '{'
// Empty collection
if (this.peek().kind === TokenKind.RBRACE) {
this.advance();
return new InlineList(start, this.pos);
}
const first = this.eatExpression();
// Map syntax: {key: value, ...}
if (this.peek().kind === TokenKind.COLON) {
this.advance(); // consume ':'
const value = this.eatExpression();
const entries: SpelNodeImpl[] = [first, value];
while (this.peek().kind === TokenKind.COMMA) {
this.advance();
if (this.peek().kind === TokenKind.RBRACE) break;
const key = this.eatExpression();
this.expect(TokenKind.COLON);
const val = this.eatExpression();
entries.push(key, val);
}
this.expect(TokenKind.RBRACE);
return new InlineMap(start, this.pos, ...entries);
}
// List syntax: {a, b, c}
const elements: SpelNodeImpl[] = [first];
while (this.peek().kind === TokenKind.COMMA) {
this.advance();
if (this.peek().kind === TokenKind.RBRACE) break;
elements.push(this.eatExpression());
}
this.expect(TokenKind.RBRACE);
return new InlineList(start, this.pos, ...elements);
}
// ==================== HELPERS ====================
/**
* Consume comma-separated expression list
*/
private eatExpressionList(): SpelNodeImpl[] {
const args: SpelNodeImpl[] = [];
if (this.peek().kind !== TokenKind.RPAREN && this.peek().kind !== TokenKind.RBRACKET) {
args.push(this.eatExpression());
while (this.peek().kind === TokenKind.COMMA) {
this.advance();
if (this.peek().kind === TokenKind.RPAREN || this.peek().kind === TokenKind.RBRACKET) break;
args.push(this.eatExpression());
}
}
return args;
}
/**
* Consume fully qualified identifier (java.lang.String)
*/
private eatQualifiedIdentifier(): string {
const parts: string[] = [];
const token = this.advance();
parts.push(token.literal!);
while (this.peek().kind === TokenKind.DOT) {
this.advance();
const next = this.advance();
parts.push(next.literal!);
}
return parts.join('.');
}
// ==================== UTILITY ====================
private peek(offset = 0): Token {
const index = this.pos + offset;
if (index >= this.tokens.length) {
const eofPos = this.expressionString.length;
return new Token(TokenKind.EOF, eofPos, eofPos);
}
return this.tokens[index]!;
}
private advance(): Token {
const token = this.tokens[this.pos];
if (token) {
this.pos++;
return token;
}
const eofPos = this.expressionString.length;
return new Token(TokenKind.EOF, eofPos, eofPos);
}
private expect(kind: TokenKind): Token {
const token = this.peek();
if (token.kind !== kind) {
throw this.raise(SpelMessage.OODES, TokenKind[kind], TokenKind[token.kind]);
}
return this.advance();
}
private raise(message: SpelMessage, ...args: string[]): SpelParseException {
return new SpelParseException(this.peek().startPos, message, ...args);
}
}
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