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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 | 11x 9x 9x 9x 9x 9x 9x 9x 9x 9x 55x 55x 1x 54x 8x 8x 8x 8x 8x 8x 2x 2x 2x 8x 8x 1x 1x 8x 8x 8x 1x 1x 8x 14x 14x 14x 14x 5x 5x 1x 14x 8x 14x 14x 7x 7x 7x 7x 9x 7x 7x 9x 8x 8x 2x 6x 6x 2x 2x 6x | import { Connection, Diagnostic, DiagnosticSeverity, DiagnosticTag } from 'vscode-languageserver/browser';
import { SparqlLexer, SparqlParser, IToken, RdfToken } from '@faubulous/mentor-rdf-parsers';
import { LanguageServerBase } from '@src/languages/language-server';
import { TextDocument } from 'vscode-languageserver-textdocument';
/**
* Represents information about a SPARQL query scope (SELECT, CONSTRUCT, etc.).
*/
interface QueryScope {
/**
* Whether this scope uses SELECT * (star select).
*/
isStarSelect: boolean;
/**
* The depth of curly braces when this scope was created.
*/
depth: number;
/**
* Variables and their occurrence tokens within this scope.
*/
variables: Map<string, IToken[]>;
/**
* Variables that are projection targets in the SELECT clause (AS ?x).
*/
projectionVariables: Set<string>;
}
export class SparqlLanguageServer extends LanguageServerBase {
constructor(connection: Connection) {
super(connection, 'sparql', 'SPARQL', new SparqlLexer(), new SparqlParser(), true);
}
override getLintDiagnostics(document: TextDocument, content: string, tokens: IToken[]): Diagnostic[] {
// Get base diagnostics from parent class (prefix checks, etc.)
const result = super.getLintDiagnostics(document, content, tokens);
// Add SPARQL-specific unused variable diagnostics
result.push(...this._getUnusedVariableDiagnostics(document, tokens));
return result;
}
/**
* Get diagnostics for unused variables in SPARQL queries.
* A variable is considered unused if it appears only once and the query doesn't use SELECT *.
*/
private _getUnusedVariableDiagnostics(document: TextDocument, tokens: IToken[]): Diagnostic[] {
const diagnostics: Diagnostic[] = [];
const scopeStack: QueryScope[] = [];
let currentDepth = 0;
let expectingSelectClause = false;
let inSelectClause = false;
for (let i = 0; i < tokens.length; i++) {
const token = tokens[i];
if (!token.tokenType) {
continue;
}
// Only check the variable usage in SELECT/CONSTRUCT/DESCRIBE queries.
// In ASK queries, all variables are considered used.
switch (token.tokenType.name) {
case RdfToken.SELECT.name:
case RdfToken.CONSTRUCT.name:
case RdfToken.DESCRIBE.name: {
// Start tracking a new query scope
const newScope: QueryScope = {
isStarSelect: false,
depth: currentDepth,
variables: new Map(),
projectionVariables: new Set()
};
scopeStack.push(newScope);
Eif (token.tokenType.name === RdfToken.SELECT.name) {
expectingSelectClause = true;
inSelectClause = true;
}
break;
}
case RdfToken.STAR.name: {
// Check if this is a SELECT * (star in select clause)
Eif (inSelectClause && scopeStack.length > 0) {
scopeStack[scopeStack.length - 1].isStarSelect = true;
}
break;
}
case RdfToken.LCURLY.name: {
currentDepth++;
// End of SELECT clause when we hit the first curly brace
if (expectingSelectClause) {
expectingSelectClause = false;
inSelectClause = false;
}
break;
}
case RdfToken.RCURLY.name: {
currentDepth--;
// Check if any scopes should be closed
while (scopeStack.length > 0 && scopeStack[scopeStack.length - 1].depth > currentDepth) {
const closedScope = scopeStack.pop()!;
diagnostics.push(...this._checkScopeForUnusedVariables(document, closedScope));
}
break;
}
case RdfToken.VAR1.name:
case RdfToken.VAR2.name: {
// Track variable occurrences in the current scope
Eif (scopeStack.length > 0) {
const currentScope = scopeStack[scopeStack.length - 1];
const varName = token.image;
// Check if this variable is a projection target (preceded by AS in SELECT clause)
if (inSelectClause && i > 0) {
const prevToken = tokens[i - 1];
if (prevToken?.tokenType?.name === RdfToken.AS_KW.name) {
currentScope.projectionVariables.add(varName);
}
}
if (!currentScope.variables.has(varName)) {
currentScope.variables.set(varName, []);
}
currentScope.variables.get(varName)!.push(token);
}
break;
}
case RdfToken.WHERE.name: {
// End of SELECT clause
Eif (expectingSelectClause) {
expectingSelectClause = false;
inSelectClause = false;
}
break;
}
}
}
// Check any remaining scopes at end of document
while (scopeStack.length > 0) {
const closedScope = scopeStack.pop()!;
diagnostics.push(...this._checkScopeForUnusedVariables(document, closedScope));
}
return diagnostics;
}
/**
* Check a query scope for unused variables and return diagnostics.
*/
private _checkScopeForUnusedVariables(document: TextDocument, scope: QueryScope): Diagnostic[] {
const diagnostics: Diagnostic[] = [];
// Don't report unused variables if this is a SELECT * query
if (scope.isStarSelect) {
return diagnostics;
}
for (const [varName, occurrences] of scope.variables) {
// A variable that appears only once is considered unused,
// unless it's a projection target in the SELECT clause (AS ?x)
if (occurrences.length === 1 && !scope.projectionVariables.has(varName)) {
const token = occurrences[0];
diagnostics.push({
code: 'UnusedVariableHint',
severity: DiagnosticSeverity.Hint,
tags: [DiagnosticTag.Unnecessary],
message: `Variable '${varName}' is used only once.`,
range: {
start: document.positionAt(token.startOffset),
end: document.positionAt((token.endOffset ?? token.startOffset) + 1)
}
});
}
}
return diagnostics;
}
}
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