rawsql-ts
Version:
High-performance SQL parser and AST analyzer written in TypeScript. Provides fast parsing and advanced transformation capabilities.
74 lines • 1.98 kB
JavaScript
/**
* Manages and coordinates multiple token readers
*/
export class TokenReaderManager {
constructor(input, position = 0) {
this.input = input;
this.position = position;
this.readers = [];
}
/**
* Register a token reader
* @param reader The reader to register
* @returns This manager instance for chaining
*/
register(reader) {
this.readers.push(reader);
return this;
}
/**
* Register multiple token readers
* @param readers The readers to register
* @returns This manager instance for chaining
*/
registerAll(readers) {
for (let i = 0; i < readers.length; i++) {
this.readers.push(readers[i]);
}
return this;
}
/**
* Try to read a token using all registered readers
* @param position The position to read from
* @param previous The previous token, if any
* @returns The lexeme if a reader could read it, null otherwise
*/
tryRead(position, previous) {
this.position = position;
const readers = this.readers;
// Index-based iteration avoids iterator allocations in the hottest parse loop.
for (let i = 0; i < readers.length; i++) {
const reader = readers[i];
reader.setPosition(position);
const lexeme = reader.tryRead(previous);
if (lexeme) {
this.position = reader.getPosition();
return lexeme;
}
}
return null;
}
/**
* Get the maximum position among all readers
*/
getMaxPosition() {
return this.position;
}
/**
* Get the input string
*/
getInput() {
return this.input;
}
/**
* Get cache statistics
*/
getCacheStats() {
return {
hits: 0,
misses: 0,
ratio: 0
};
}
}
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