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/**
* Category of a completion suggestion.
*/
export enum CompletionKind {
KEYWORD = 'keyword',
OPERATOR = 'operator',
VARIABLE = 'variable',
PROPERTY = 'property',
METHOD = 'method',
FUNCTION = 'function',
BEAN = 'bean',
TYPE = 'type',
SNIPPET = 'snippet',
}
export interface CompletionItem {
label: string;
kind: CompletionKind;
detail?: string;
documentation?: string;
insertText: string;
sortPriority: number;
}
/**
* Static completions that are always available regardless of context.
*/
const STATIC_COMPLETIONS: CompletionItem[] = [
// Keywords
{
label: 'null',
kind: CompletionKind.KEYWORD,
detail: 'Null literal',
insertText: 'null',
sortPriority: 50,
},
{
label: 'true',
kind: CompletionKind.KEYWORD,
detail: 'Boolean true',
insertText: 'true',
sortPriority: 50,
},
{
label: 'false',
kind: CompletionKind.KEYWORD,
detail: 'Boolean false',
insertText: 'false',
sortPriority: 50,
},
{
label: 'new',
kind: CompletionKind.KEYWORD,
detail: 'Constructor call',
insertText: 'new ',
sortPriority: 50,
},
{
label: 'T()',
kind: CompletionKind.KEYWORD,
detail: 'Type reference',
insertText: 'T($1)',
sortPriority: 50,
},
// Operators
{
label: 'and (&&)',
kind: CompletionKind.OPERATOR,
detail: 'Logical AND',
insertText: 'and ',
sortPriority: 40,
},
{
label: 'or (||)',
kind: CompletionKind.OPERATOR,
detail: 'Logical OR',
insertText: 'or ',
sortPriority: 40,
},
{
label: 'not (!)',
kind: CompletionKind.OPERATOR,
detail: 'Logical NOT',
insertText: 'not ',
sortPriority: 40,
},
{
label: '==',
kind: CompletionKind.OPERATOR,
detail: 'Equal to',
insertText: '== ',
sortPriority: 40,
},
{
label: '!=',
kind: CompletionKind.OPERATOR,
detail: 'Not equal to',
insertText: '!= ',
sortPriority: 40,
},
{
label: '>',
kind: CompletionKind.OPERATOR,
detail: 'Greater than',
insertText: '> ',
sortPriority: 40,
},
{
label: '<',
kind: CompletionKind.OPERATOR,
detail: 'Less than',
insertText: '< ',
sortPriority: 40,
},
{
label: '>=',
kind: CompletionKind.OPERATOR,
detail: 'Greater than or equal',
insertText: '>= ',
sortPriority: 40,
},
{
label: '<=',
kind: CompletionKind.OPERATOR,
detail: 'Less than or equal',
insertText: '<= ',
sortPriority: 40,
},
{
label: 'matches',
kind: CompletionKind.OPERATOR,
detail: 'Regex match',
insertText: "matches '$1'",
sortPriority: 40,
},
{
label: 'between',
kind: CompletionKind.OPERATOR,
detail: 'Range check',
insertText: 'between {$1, $2}',
sortPriority: 40,
},
{
label: 'instanceof',
kind: CompletionKind.OPERATOR,
detail: 'Type check',
insertText: 'instanceof ',
sortPriority: 40,
},
{
label: '?:',
kind: CompletionKind.OPERATOR,
detail: 'Elvis (null-safe default)',
insertText: '?: $1',
sortPriority: 40,
},
// Snippets
{
label: '?: ternary',
kind: CompletionKind.SNIPPET,
detail: 'Ternary conditional',
insertText: '$1 ? $2 : $3',
sortPriority: 20,
},
{
label: '.?[]',
kind: CompletionKind.SNIPPET,
detail: 'Collection selection (all)',
insertText: '.?[$1]',
sortPriority: 20,
},
{
label: '.![]',
kind: CompletionKind.SNIPPET,
detail: 'Collection projection',
insertText: '.![$1]',
sortPriority: 20,
},
{
label: '.^[]',
kind: CompletionKind.SNIPPET,
detail: 'Collection selection (first)',
insertText: '.^[$1]',
sortPriority: 20,
},
{
label: '.*[]',
kind: CompletionKind.SNIPPET,
detail: 'Collection selection (last)',
insertText: '.*[$1]',
sortPriority: 20,
},
{
label: '#this',
kind: CompletionKind.SNIPPET,
detail: 'Current element reference',
insertText: '#this',
sortPriority: 30,
},
];
/**
* Completion engine for SpEL expressions.
*
* Provides context-aware auto-completion suggestions for editors.
* When a ContextSchema is available, suggestions include variable names,
* property names, method names, bean names, and type names.
*/
export namespace SpelCompletionEngine {
/**
* Get completion suggestions at a given cursor position.
*
* @param expression The current expression text
* @param position Cursor position (character offset)
* @param contextSchema Optional context schema for context-aware completions
* @returns Sorted list of completion items
*/
export function getCompletions(
expression: string,
position: number,
contextSchema?: ContextSchema,
): CompletionItem[] {
const prefix = getPrefixAt(expression, position);
const items: CompletionItem[] = [];
// Always include static completions filtered by prefix
for (const item of STATIC_COMPLETIONS) {
if (matchesPrefix(item.label, prefix)) {
items.push(item);
}
}
// Add context-aware completions if schema is available
if (contextSchema) {
items.push(...getContextCompletions(expression, position, contextSchema, prefix));
}
// Sort by priority (descending) then alphabetically
items.sort((a, b) => {
if (b.sortPriority !== a.sortPriority) return b.sortPriority - a.sortPriority;
return a.label.localeCompare(b.label);
});
return items;
}
/**
* Get static keyword and operator completions (no context needed).
*/
export function getStaticCompletions(): CompletionItem[] {
return [...STATIC_COMPLETIONS];
}
/**
* Get context-aware completions based on a ContextSchema.
*/
export function getContextCompletions(
_expression: string,
_position: number,
contextSchema: ContextSchema,
prefix = '',
): CompletionItem[] {
const items: CompletionItem[] = [];
// Variables from context schema
for (const [name, schema] of Object.entries(contextSchema.variables)) {
const label = '#' + name;
if (matchesPrefix(label, prefix)) {
items.push({
label,
kind: CompletionKind.VARIABLE,
detail: schema.type ? `Variable (${schema.type})` : 'Variable',
insertText: '#' + name,
sortPriority: 100,
});
}
}
// Root object fields
if (contextSchema.root) {
for (const [name, schema] of Object.entries(contextSchema.root.fields)) {
Eif (matchesPrefix(name, prefix)) {
items.push({
label: name,
kind: CompletionKind.PROPERTY,
detail: `Field (${schema.type})`,
insertText: name,
sortPriority: 90,
});
}
}
// Root object methods
for (const [name, schema] of Object.entries(contextSchema.root.methods)) {
Eif (matchesPrefix(name, prefix)) {
items.push({
label: name + '()',
kind: CompletionKind.METHOD,
detail: schema.returnType ? `→ ${schema.returnType}` : 'Method',
insertText: name + '($1)',
sortPriority: 85,
});
}
}
}
// Registered functions
for (const [name, schema] of Object.entries(contextSchema.functions)) {
const label = '#' + name;
Eif (matchesPrefix(label, prefix)) {
items.push({
label: label + '()',
kind: CompletionKind.FUNCTION,
detail: schema.returnType ? `→ ${schema.returnType}` : 'Function',
insertText: '#' + name + '($1)',
sortPriority: 95,
});
}
}
// Registered beans
for (const [name, schema] of Object.entries(contextSchema.beans)) {
const label = '@' + name;
if (matchesPrefix(label, prefix)) {
items.push({
label,
kind: CompletionKind.BEAN,
detail: schema.type ? `Bean (${schema.type})` : 'Bean',
insertText: '@' + name,
sortPriority: 90,
});
}
}
// Registered types
for (const [name, schema] of Object.entries(contextSchema.types)) {
const label = 'T(' + name + ')';
Eif (matchesPrefix(label, prefix)) {
items.push({
label,
kind: CompletionKind.TYPE,
detail: schema.className ? `Class: ${schema.className}` : 'Type',
insertText: 'T(' + name + ')',
sortPriority: 85,
});
}
}
return items;
}
// ===== Private helpers =====
/** The characters a completable prefix is made of: `\w` plus the `.` of a property path. */
const NAME_CHARACTER = /[\w.]/;
/**
* Extract the word at the cursor position as the completion prefix.
*
* Scanned backwards rather than matched with `/(#|@|T\()?[\w.]*$/`. That pattern is quadratic
* when the text before the cursor ends in a long run of name characters that the end anchor
* then rejects: the engine retries the quantified class from every offset, which measured
* 615 ms for 32 000 characters, and this receives everything the caller passes as the
* expression. Boundary is equivalent — the anchor makes the leftmost match the longest run
* ending at the cursor — and the loop visits each character once.
*/
function getPrefixAt(expression: string, position: number): string {
let start = position;
while (start > 0 && NAME_CHARACTER.test(expression.charAt(start - 1))) {
start--;
}
// `#name`, `@bean` and `T(Type` all carry their introducer inside the prefix.
const introducer = expression.charAt(start - 1);
if (introducer === '#' || introducer === '@') {
start--;
} else if (introducer === '(' && expression.charAt(start - 2) === 'T') {
start -= 2;
}
return expression.slice(start, position);
}
/**
* Check if a label matches the current prefix (case-insensitive).
*/
function matchesPrefix(label: string, prefix: string): boolean {
if (!prefix) return true;
return label.toLowerCase().startsWith(prefix.toLowerCase());
}
}
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