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import type { SpelReference } from './reference-extractor.js';
import type { ContextSchema } from '../types/context-schema.js';
import { SpelExpressionParser } from '../spel-expression-parser.js';
import { SpelParseException } from '../error/spel-parse-exception.js';
import { SpelReferenceExtractor, SpelReferenceKind } from './reference-extractor.js';
/** Severity level for diagnostics */
export enum DiagnosticSeverity {
ERROR = 'error',
WARNING = 'warning',
INFO = 'info',
}
/** Source category for diagnostics */
export enum DiagnosticSource {
SYNTAX = 'syntax',
SEMANTIC = 'semantic',
CONTEXT = 'context',
TYPE = 'type',
}
export interface SpelDiagnostic {
severity: DiagnosticSeverity;
message: string;
from: number;
to: number;
code: string;
source: DiagnosticSource;
}
export interface ContextValidationResult {
valid: boolean;
diagnostics: SpelDiagnostic[];
missingReferences: SpelReference[];
typeMismatches: {
referenceName: string;
expectedType: string;
actualUsage: string;
position: number;
}[];
}
/**
* Multi-stage diagnostic engine for SpEL expressions.
*
* Pipeline:
* 1. Syntax check — uses the parser for exact error detection
* 2. Semantic check — detects self-comparisons, double-negation, tautologies
* 3. Context check — validates references against a ContextSchema
* 4. Type check — detects operand type mismatches
*/
export namespace SpelDiagnosticEngine {
/**
* Check syntax validity of an expression.
* Returns diagnostics from the SpEL parser.
*/
export function checkSyntax(expression: string): SpelDiagnostic[] {
try {
const parser = new SpelExpressionParser();
parser.parseExpression(expression);
return []; // Valid
} catch (e) {
if (e instanceof SpelParseException) {
return [
{
severity: DiagnosticSeverity.ERROR,
message: e.message,
from: e.position,
to: expression.length,
code: 'SYNTAX-' + (String(e.messageCode) || 'UNKNOWN'),
source: DiagnosticSource.SYNTAX,
},
];
}
return [
{
severity: DiagnosticSeverity.ERROR,
message: (e as Error).message,
from: 0,
to: expression.length,
code: 'SYNTAX-UNKNOWN',
source: DiagnosticSource.SYNTAX,
},
];
}
}
/**
* Check for semantic issues (self-comparison, double negation, tautologies).
*/
export function checkSemantics(expression: string): SpelDiagnostic[] {
const diagnostics: SpelDiagnostic[] = [];
// Double negation: !!expr or not not expr
const doubleNegPattern = /!\s*!|not\s+not/i;
const dnMatch = doubleNegPattern.exec(expression);
if (dnMatch) {
diagnostics.push({
severity: DiagnosticSeverity.WARNING,
message: 'Double negation detected — consider simplifying',
from: dnMatch.index,
to: dnMatch.index + dnMatch[0].length,
code: 'SEMANTIC-DOUBLE_NEGATION',
source: DiagnosticSource.SEMANTIC,
});
}
// Self-comparison: detect patterns like #x == #x or #x != #x
const selfCompPattern = /#(\w+)\s*(==|!=|eq|ne)\s*#\1/g;
let scMatch: RegExpExecArray | null;
while ((scMatch = selfCompPattern.exec(expression)) !== null) {
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion -- regex guarantees group 2 exists when matched
const op = scMatch[2]!;
const isNeq = op === '!=' || op.toLowerCase() === 'ne';
diagnostics.push({
severity: DiagnosticSeverity.WARNING,
message: isNeq
? `Self-comparison '#${scMatch[1]} != #${scMatch[1]}' is always false`
: `Self-comparison '#${scMatch[1]} == #${scMatch[1]}' is always true`,
from: scMatch.index,
to: scMatch.index + scMatch[0].length,
code: 'SEMANTIC-SELF_COMPARISON',
source: DiagnosticSource.SEMANTIC,
});
}
// Always-true: true or ...
if (/^true\s+or\b/i.test(expression)) {
diagnostics.push({
severity: DiagnosticSeverity.INFO,
message: 'Expression starts with "true or ..." — left side is always true',
from: 0,
to: 8,
code: 'SEMANTIC-TAUTOLOGY',
source: DiagnosticSource.SEMANTIC,
});
}
// Always-false: false and ...
if (/^false\s+and\b/i.test(expression)) {
diagnostics.push({
severity: DiagnosticSeverity.INFO,
message: 'Expression starts with "false and ..." — left side is always false',
from: 0,
to: 10,
code: 'SEMANTIC-CONTRADICTION',
source: DiagnosticSource.SEMANTIC,
});
}
return diagnostics;
}
/**
* Validate expression references against a ContextSchema.
*/
export function checkContext(expression: string, contextSchema: ContextSchema): SpelDiagnostic[] {
const refs = SpelReferenceExtractor.extract(expression);
const diagnostics: SpelDiagnostic[] = [];
const missingRefs: SpelReference[] = [];
for (const ref of refs) {
switch (ref.kind) {
case SpelReferenceKind.VARIABLE: {
// Check if variable exists in schema
if (ref.name !== 'root' && ref.name !== 'this') {
const hasVariable = ref.name in contextSchema.variables;
if (!hasVariable) {
missingRefs.push(ref);
diagnostics.push({
severity: DiagnosticSeverity.WARNING,
message: `Variable '#${ref.name}' is not defined in context`,
from: ref.startPos,
to: ref.endPos,
code: 'CONTEXT-UNDEFINED_VARIABLE',
source: DiagnosticSource.CONTEXT,
});
}
}
break;
}
case SpelReferenceKind.ROOT_PROPERTY: {
// Check if property exists on root object
if (contextSchema.root) {
const hasField = ref.name in contextSchema.root.fields;
if (!hasField) {
missingRefs.push(ref);
diagnostics.push({
severity: DiagnosticSeverity.WARNING,
message: `Property '${ref.name}' not found on root object '${contextSchema.root.name}'`,
from: ref.startPos,
to: ref.endPos,
code: 'CONTEXT-UNKNOWN_PROPERTY',
source: DiagnosticSource.CONTEXT,
});
}
}
break;
}
case SpelReferenceKind.BEAN:
case SpelReferenceKind.BEAN_FACTORY: {
const hasBean = ref.name in contextSchema.beans;
if (!hasBean) {
missingRefs.push(ref);
diagnostics.push({
severity: DiagnosticSeverity.WARNING,
message: `Bean '@${ref.name}' is not registered in context`,
from: ref.startPos,
to: ref.endPos,
code: 'CONTEXT-UNDEFINED_BEAN',
source: DiagnosticSource.CONTEXT,
});
}
break;
}
case SpelReferenceKind.TYPE: {
const hasType = ref.name in contextSchema.types;
if (!hasType) {
missingRefs.push(ref);
diagnostics.push({
severity: DiagnosticSeverity.WARNING,
message: `Type 'T(${ref.name})' is not registered in context`,
from: ref.startPos,
to: ref.endPos,
code: 'CONTEXT-UNDEFINED_TYPE',
source: DiagnosticSource.CONTEXT,
});
}
break;
}
case SpelReferenceKind.FUNCTION: {
const hasFunc = ref.name in contextSchema.functions;
if (!hasFunc) {
missingRefs.push(ref);
diagnostics.push({
severity: DiagnosticSeverity.WARNING,
message: `Function '#${ref.name}' is not registered in context`,
from: ref.startPos,
to: ref.endPos,
code: 'CONTEXT-UNDEFINED_FUNCTION',
source: DiagnosticSource.CONTEXT,
});
}
break;
}
default:
break;
}
}
return diagnostics;
}
/**
* Run all validation stages.
*/
export function validate(expression: string, contextSchema?: ContextSchema): SpelDiagnostic[] {
const diagnostics: SpelDiagnostic[] = [];
// Stage 1: Syntax
diagnostics.push(...checkSyntax(expression));
// If syntax errors exist, skip further stages (expression can't be parsed)
if (
diagnostics.some(
(d) => d.source === DiagnosticSource.SYNTAX && d.severity === DiagnosticSeverity.ERROR,
)
) {
return diagnostics;
}
// Stage 2: Semantic
diagnostics.push(...checkSemantics(expression));
// Stage 3: Context (only if schema provided)
if (contextSchema) {
diagnostics.push(...checkContext(expression, contextSchema));
}
return diagnostics;
}
/**
* Parse an expression and return both AST and diagnostics.
*/
export function parseWithDiagnostics(expression: string): {
ast: SpelNodeImpl | null;
diagnostics: SpelDiagnostic[];
} {
const diagnostics: SpelDiagnostic[] = [];
try {
const parser = new SpelExpressionParser();
const expr = parser.parseExpression(expression);
const ast = (expr as { getAST?: () => SpelNodeImpl }).getAST?.() ?? null;
// Run semantic checks on valid expression
diagnostics.push(...checkSemantics(expression));
return { ast, diagnostics };
} catch (e) {
if (e instanceof SpelParseException) {
diagnostics.push({
severity: DiagnosticSeverity.ERROR,
message: e.message,
from: e.position,
to: expression.length,
code: 'SYNTAX-' + (String(e.messageCode) || 'UNKNOWN'),
source: DiagnosticSource.SYNTAX,
});
} else {
diagnostics.push({
severity: DiagnosticSeverity.ERROR,
message: (e as Error).message,
from: 0,
to: expression.length,
code: 'SYNTAX-UNKNOWN',
source: DiagnosticSource.SYNTAX,
});
}
return { ast: null, diagnostics };
}
}
}
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