rawsql-ts
Version:
[beta]High-performance SQL parser and AST analyzer written in TypeScript. Provides fast parsing and advanced transformation capabilities.
86 lines • 4.39 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.ValuesQueryParser = void 0;
const Lexeme_1 = require("../models/Lexeme");
const SelectQuery_1 = require("../models/SelectQuery");
const ValueComponent_1 = require("../models/ValueComponent");
const SqlTokenizer_1 = require("./SqlTokenizer");
const ValueParser_1 = require("./ValueParser");
class ValuesQueryParser {
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 VALUES clause is complete but there are additional tokens.`);
}
return result.value;
}
static parseFromLexeme(lexemes, index) {
let idx = index;
if (lexemes[idx].value.toLowerCase() !== 'values') {
throw new Error(`Syntax error at position ${idx}: Expected 'VALUES' keyword but found "${lexemes[idx].value}". VALUES clauses must start with the VALUES keyword.`);
}
idx++;
if (idx >= lexemes.length) {
throw new Error(`Syntax error: Unexpected end of input after 'VALUES' keyword. The VALUES clause requires at least one tuple expression.`);
}
const tuples = [];
// Parse the first tuple
const firstTuple = this.parseTuple(lexemes, idx);
tuples.push(firstTuple.value);
idx = firstTuple.newIndex;
// Parse additional tuples if they exist
while (idx < lexemes.length && (lexemes[idx].type & Lexeme_1.TokenType.Comma)) {
idx++; // Skip comma
const tuple = this.parseTuple(lexemes, idx);
tuples.push(tuple.value);
idx = tuple.newIndex;
}
const query = new SelectQuery_1.ValuesQuery(tuples);
return { value: query, newIndex: idx };
}
static parseTuple(lexemes, index) {
let idx = index;
// Check for opening parenthesis
if (idx >= lexemes.length || lexemes[idx].type !== Lexeme_1.TokenType.OpenParen) {
throw new Error(`Syntax error at position ${idx}: Expected opening parenthesis but found "${idx < lexemes.length ? lexemes[idx].value : "end of input"}". Tuple expressions in VALUES clause must be enclosed in parentheses.`);
}
idx++;
// Parse values inside the tuple
const values = [];
// Parse first value
if (idx >= lexemes.length) {
throw new Error(`Syntax error: Unexpected end of input after opening parenthesis in tuple expression.`);
}
// Check for empty tuple case
if (lexemes[idx].type & Lexeme_1.TokenType.CloseParen) {
idx++; // Skip closing parenthesis
return { value: new ValueComponent_1.TupleExpression([]), newIndex: idx };
}
// Parse the first value
const firstValue = ValueParser_1.ValueParser.parseFromLexeme(lexemes, idx);
values.push(firstValue.value);
idx = firstValue.newIndex;
// Parse additional values
while (idx < lexemes.length && (lexemes[idx].type & Lexeme_1.TokenType.Comma)) {
idx++; // Skip comma
if (idx >= lexemes.length) {
throw new Error(`Syntax error: Unexpected end of input after comma in tuple expression.`);
}
const value = ValueParser_1.ValueParser.parseFromLexeme(lexemes, idx);
values.push(value.value);
idx = value.newIndex;
}
// Check for closing parenthesis
if (idx >= lexemes.length || lexemes[idx].type !== Lexeme_1.TokenType.CloseParen) {
throw new Error(`Syntax error at position ${idx}: Expected closing parenthesis but found "${idx < lexemes.length ? lexemes[idx].value : "end of input"}". Tuple expressions in VALUES clause must be enclosed in parentheses.`);
}
idx++; // Skip closing parenthesis
return { value: new ValueComponent_1.TupleExpression(values), newIndex: idx };
}
}
exports.ValuesQueryParser = ValuesQueryParser;
//# sourceMappingURL=ValuesQueryParser.js.map