"""Convert CENTVRION parse failures into LSP-style diagnostic dicts.

Returns a list of plain dicts so the server layer can map them to
lsprotocol types without this module importing pygls. Runtime errors
are explicitly out of scope: we only catch lex and parse failures.
"""
from centvrion.lsp.analysis import ParseFailure, parse


def build_diagnostics(source: str) -> list[dict]:
  result = parse(source)
  if not isinstance(result, ParseFailure):
    return []
  return [{
    "line": result.line,
    "character": result.character,
    "length": result.length,
    "message": result.message,
    "severity": 1,  # Error
    "source": "centvrion",
  }]