Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import { NodeType } from './node-type.js';
import type { SpelNodeImpl } from '../ast/spel-node.js';
import { SpelExpressionParser } from '../spel-expression-parser.js';
import { VariableReference } from '../ast/reference/variable-reference.js';
import { PropertyOrFieldReference } from '../ast/reference/property-or-field-reference.js';
import { BeanReference } from '../ast/reference/bean-reference.js';
import { TypeReference } from '../ast/reference/type-reference.js';
export enum SpelReferenceKind {
VARIABLE = 'variable',
ROOT_PROPERTY = 'root_property',
THIS_PROPERTY = 'this_property',
BEAN = 'bean',
BEAN_FACTORY = 'bean_factory',
TYPE = 'type',
FUNCTION = 'function',
}
export interface SpelReference {
kind: SpelReferenceKind;
name: string;
path: string[];
startPos: number;
endPos: number;
nodeType: NodeType;
}
export namespace SpelReferenceExtractor {
export function extract(expression: string): SpelReference[] {
try {
const parser = new SpelExpressionParser();
const ast = parser.parseRaw(expression);
return extractFromAst(ast);
} catch {
return extractFallback(expression);
}
}
export function extractFromAst(root: SpelNodeImpl): SpelReference[] {
const refs: SpelReference[] = [];
AstWalker.walk(root, {
enterNode(node, ancestors) {
switch (node.nodeType) {
case NodeType.VARIABLE_REFERENCE: {
const varRef = node as unknown as VariableReference;
const name =
typeof varRef.getVariableName === 'function' ? varRef.getVariableName() : '';
const parent = ancestors[ancestors.length - 1];
const isFunction =
ancestors.length > 0 && parent?.nodeType === NodeType.METHOD_REFERENCE;
refs.push({
kind: isFunction ? SpelReferenceKind.FUNCTION : SpelReferenceKind.VARIABLE,
name,
path: [name],
startPos: node.startPos,
endPos: node.endPos,
nodeType: node.nodeType,
});
break;
}
case NodeType.PROPERTY_OR_FIELD_REFERENCE: {
const propRef = node as unknown as PropertyOrFieldReference;
const name = typeof propRef.getName === 'function' ? propRef.getName() : '';
const parent = ancestors[ancestors.length - 1];
const kind =
parent?.nodeType === NodeType.VARIABLE_REFERENCE
? SpelReferenceKind.ROOT_PROPERTY
: SpelReferenceKind.THIS_PROPERTY;
refs.push({
kind,
name,
path: [name],
startPos: node.startPos,
endPos: node.endPos,
nodeType: node.nodeType,
});
break;
}
case NodeType.BEAN_REFERENCE: {
const beanRef = node as unknown as BeanReference;
const name = typeof beanRef.getBeanName === 'function' ? beanRef.getBeanName() : '';
refs.push({
kind:
typeof beanRef.isFactory === 'function' && beanRef.isFactory()
? SpelReferenceKind.BEAN_FACTORY
: SpelReferenceKind.BEAN,
name,
path: [name],
startPos: node.startPos,
endPos: node.endPos,
nodeType: node.nodeType,
});
break;
}
case NodeType.TYPE_REFERENCE: {
const typeRef = node as unknown as TypeReference;
const name = typeof typeRef.getTypeName === 'function' ? typeRef.getTypeName() : '';
refs.push({
kind: SpelReferenceKind.TYPE,
name,
path: [name],
startPos: node.startPos,
endPos: node.endPos,
nodeType: node.nodeType,
});
break;
}
default:
break;
}
return true;
},
});
return refs;
}
function extractFallback(expression: string): SpelReference[] {
const refs: SpelReference[] = [];
// Regex capture groups are always populated when matched — non-null assertions are safe here.
const varRegex = /#(\w+(?:\.\w+)*)/g;
let match: RegExpExecArray | null;
while ((match = varRegex.exec(expression)) !== null) {
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion -- regex capture group 1 always populated
const varName = match[1]!;
refs.push({
kind: SpelReferenceKind.VARIABLE,
name: varName,
path: varName.split('.'),
startPos: match.index,
endPos: match.index + match[0].length,
nodeType: NodeType.VARIABLE_REFERENCE,
});
}
const beanRegex = /@(\w+)/g;
while ((match = beanRegex.exec(expression)) !== null) {
if (match.index > 0 && expression[match.index - 1] === '&') continue;
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion -- regex capture group 1 always populated
const beanName = match[1]!;
refs.push({
kind: SpelReferenceKind.BEAN,
name: beanName,
path: [beanName],
startPos: match.index,
endPos: match.index + match[0].length,
nodeType: NodeType.BEAN_REFERENCE,
});
}
const factoryRegex = /&@(\w+)/g;
while ((match = factoryRegex.exec(expression)) !== null) {
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion -- regex capture group 1 always populated
const factoryName = match[1]!;
refs.push({
kind: SpelReferenceKind.BEAN_FACTORY,
name: factoryName,
path: [factoryName],
startPos: match.index,
endPos: match.index + match[0].length,
nodeType: NodeType.BEAN_REFERENCE,
});
}
const typeRegex = /T\((\w+(?:\.\w+)*)\)/g;
while ((match = typeRegex.exec(expression)) !== null) {
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion -- regex capture group 1 always populated
const typeName = match[1]!;
refs.push({
kind: SpelReferenceKind.TYPE,
name: typeName,
path: [typeName],
startPos: match.index,
endPos: match.index + match[0].length,
nodeType: NodeType.TYPE_REFERENCE,
});
}
return refs;
}
/** @internal — exported for testing the fallback regex paths */
export function _testExtractFallback(expression: string): SpelReference[] {
return extractFallback(expression);
}
}
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