tool/generate_converter

#!/bin/bash --
#
# Generates converter -->dart_model from `_fe_analyzer_shared` code.
#
# TODO(davidmorgan): this is intended to be single use code: delete if we don't
# need it again, convert to Dart if we do.
#
# mkdir /tmp/inputs
# cp ~/git/dart-sdk/sdk/pkg/_fe_analyzer_shared/lib/src/metadata/* /tmp/inputs
# rm /tmp/inputs/proto.dart /tmp/inputs/parser.dart /tmp/inputs/scope.dart
# tool/generate_converter /tmp/inputs

path="$1"
source=$(find $path -name \*.dart | xargs cat)
IFS=$'\n'

# Unions.
for union in $(
  echo "$source" \
  | grep 'sealed class' \
  | sed -e s'#sealed class ##' \
  | sed -e 's# {##' \
  | sort); do
  echo "dart_model.$union? convertTo$union(Object? object) => switch (object) {"
  for type in $(echo "$source" \
    | grep "extends $union" \
    | sed -e 's#abstract ##' \
    | sed -e 's#class ##' \
    | sed -e 's# extends .*##'); do
    lower_first_type=${type,}
    echo "    front_end.$type o => dart_model.$union.$lower_first_type(convert<dart_model.$type>(o)!),"
  done
  echo "null => null,"
  echo "_ => throw ArgumentError(object),"
  echo "};";
done

echo "T? convert<T>(Object? object) => switch (object) {"

# Enums.
for type in $(echo "$source" \
  | egrep '^enum [A-Z]' \
  | sed -e 's#enum ##' \
  | sed -e 's# .*##' \
  | sort); do
  echo "front_end.$type o => o.name as T,"
done

# Classes.
for type in $(echo "$source" \
  | egrep '^[a-z ]*class ' \
  | grep -v 'sealed' \
  | sed -e 's#abstract ##' \
  | sed -e 's#class ##' \
  | sed -e 's# extends .*##' \
  | sed -e 's# {##' \
  | sort); do
  echo "front_end.$type o => dart_model.$type("
  for line in $(echo "$source" \
    | grep -A1000000 "class $type extends" \
    | tail -n +2); do
    if echo "$line" | grep -q '  final'; then
      field_name=$(echo $line | sed -e 's#  final ##' | sed -e 's#.* ##' | sed -e 's#;##')
      if test "$field_name" == "unresolved"; then
        continue
      fi
      field_type=$(echo $line | sed -e 's#  final ##' | sed -e 's# .*##')
      if echo "$field_type" | egrep -q '^(Argument|Element|Expression|RecordField|Reference|StringLiteralPart)$'; then
        echo "    $field_name: convertTo$field_type(o.$field_name),"
      else
        echo "    $field_name: convert(o.$field_name),"
      fi
    else
      break
    fi
  done
  echo ") as T,"
done
echo "String o => o as T,"
echo "int o => o as T,"
echo "bool o => o as T,"
echo "double o => o as T,"
echo "List o => o.map((i) => convert<Map<String, Object?>>(i)!).toList() as T,"
echo "null => null,"
echo "_ => throw ArgumentError(object),"
echo "};"