rawsql-ts
Version:
[beta]High-performance SQL parser and AST analyzer written in TypeScript. Provides fast parsing and advanced transformation capabilities.
38 lines • 1.82 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.LimitClauseParser = void 0;
const Clause_1 = require("../models/Clause");
const SqlTokenizer_1 = require("./SqlTokenizer");
const ValueParser_1 = require("./ValueParser");
class LimitClauseParser {
// Parse SQL string to AST (was: parse)
static parse(query) {
const tokenizer = new SqlTokenizer_1.SqlTokenizer(query); // Initialize tokenizer
const lexemes = tokenizer.readLexmes(); // Get tokens
// Parse
const result = this.parseFromLexeme(lexemes, 0);
// Error if there are remaining tokens
if (result.newIndex < lexemes.length) {
throw new Error(`Syntax error: Unexpected token "${lexemes[result.newIndex].value}" at position ${result.newIndex}. The LIMIT clause is complete but there are additional tokens.`);
}
return result.value;
}
// Parse from lexeme array (was: parse)
static parseFromLexeme(lexemes, index) {
let idx = index;
if (lexemes[idx].value !== 'limit') {
throw new Error(`Syntax error at position ${idx}: Expected 'LIMIT' keyword but found "${lexemes[idx].value}". LIMIT clauses must start with the LIMIT keyword.`);
}
idx++;
if (idx >= lexemes.length) {
throw new Error(`Syntax error: Unexpected end of input after 'LIMIT' keyword. The LIMIT clause requires a numeric expression.`);
}
// Parse LIMIT value
const limitItem = ValueParser_1.ValueParser.parseFromLexeme(lexemes, idx);
idx = limitItem.newIndex;
const clause = new Clause_1.LimitClause(limitItem.value);
return { value: clause, newIndex: idx };
}
}
exports.LimitClauseParser = LimitClauseParser;
//# sourceMappingURL=LimitClauseParser.js.map