Skip to content

scannergen-backend-javascript.md

Latest commit

 

History

History
24 lines (18 loc) · 1019 Bytes

scannergen-backend-javascript.md

File metadata and controls

24 lines (18 loc) · 1019 Bytes
Raw

Scanner Generator Backend: JavaScript

This backend outputs a scanner as JavaScript source code. See scanner generator backends for what every generated scanner does and parser generator backend: JavaScript for the parser side.

The output is an ES module and needs nothing beyond the language itself.

The scanner is Scanner and its tokens are the frozen Token object, with tokenToString and isSkipped alongside it. TokenSkipper wraps a scanner to drop the tokens marked for skipping. Both offer the same members, which is what a parser reads its tokens through. Lexemes are a Uint8Array viewing into the source rather than a copy of it.

Example

examples/calculator/javascript/ is a calculator built on this backend. Its scanner was generated with:

golr scanner \
  --frontend golr \
  --frontend-file-path calculator.golr \
  --backend javascript \
  --backend-file-path parser/scanner.js