rawsql-ts
Version:
[beta]High-performance SQL parser and AST analyzer written in TypeScript. Provides fast parsing and advanced transformation capabilities.
49 lines • 2.62 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.SourceAliasExpressionParser = void 0;
const Clause_1 = require("../models/Clause");
const Lexeme_1 = require("../models/Lexeme");
class SourceAliasExpressionParser {
// Parse from lexeme array (was: parse)
static parseFromLexeme(lexemes, index) {
var _a;
let idx = index;
// If there is a column alias, it may be detected as a function, so functions are also processed.
if (idx < lexemes.length && ((lexemes[idx].type & Lexeme_1.TokenType.Identifier) || (lexemes[idx].type & Lexeme_1.TokenType.Function))) {
// Check for alias
const table = lexemes[idx].value;
idx++;
if (idx < lexemes.length && (lexemes[idx].type & Lexeme_1.TokenType.OpenParen)) {
// Check for column alias
const columns = [];
// Skip the open parenthesis
idx++;
while (idx < lexemes.length && (lexemes[idx].type & Lexeme_1.TokenType.Identifier)) {
columns.push(lexemes[idx].value);
idx++;
if (idx < lexemes.length && (lexemes[idx].type & Lexeme_1.TokenType.Comma)) {
idx++;
}
else {
break; // Exit loop if not a comma
}
}
if (lexemes[idx].type & Lexeme_1.TokenType.CloseParen) {
// Skip the closing parenthesis
idx++;
}
else {
throw new Error(`Syntax error at position ${idx}: Missing closing parenthesis ')' for column alias list. Each opening parenthesis must have a matching closing parenthesis.`);
}
if (columns.length === 0) {
throw new Error(`Syntax error at position ${index}: No column aliases found. Column alias declarations must contain at least one column name.`);
}
return { value: new Clause_1.SourceAliasExpression(table, columns), newIndex: idx };
}
return { value: new Clause_1.SourceAliasExpression(table, null), newIndex: idx };
}
throw new Error(`Syntax error at position ${index}: Expected an identifier for table alias but found "${((_a = lexemes[index]) === null || _a === void 0 ? void 0 : _a.value) || 'end of input'}".`);
}
}
exports.SourceAliasExpressionParser = SourceAliasExpressionParser;
//# sourceMappingURL=SourceAliasExpressionParser.js.map