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// Copyright 2015-2019 SWIM.AI inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package swim.recon;

import swim.codec.Input;
import swim.codec.Parser;
import swim.util.Builder;

final class AttrExpressionParser extends Parser {
  final ReconParser recon;
  final Builder builder;
  final Parser fieldParser;
  final Parser valueParser;
  final int step;

  AttrExpressionParser(ReconParser recon, Builder builder, Parser fieldParser,
                       Parser valueParser, int step) {
    this.recon = recon;
    this.builder = builder;
    this.fieldParser = fieldParser;
    this.valueParser = valueParser;
    this.step = step;
  }

  @Override
  public Parser feed(Input input) {
    return parse(input, this.recon, this.builder, this.fieldParser, this.valueParser, this.step);
  }

  static  Parser parse(Input input, ReconParser recon, Builder builder,
                                Parser fieldParser, Parser valueParser, int step) {
    int c = 0;
    do {
      if (step == 1) {
        while (input.isCont()) {
          c = input.head();
          if (Recon.isSpace(c)) {
            input = input.step();
          } else {
            break;
          }
        }
        if (input.isCont()) {
          if (c == '@') {
            step = 2;
          } else if (c == '{' || c == '[') {
            if (builder == null) {
              builder = recon.recordBuilder();
            }
            step = 5;
          } else if (c == '(') {
            step = 4;
          } else if (c == '!' || c == '"' || c == '$' || c == '%'
                  || c == '\'' || c == '+' || c == '-'
                  || c >= '0' && c <= '9' || c == '~'
                  || Recon.isIdentStartChar(c)) {
            step = 3;
          } else if (builder == null) {
            return done(recon.extant());
          } else {
            return done(builder.bind());
          }
        } else if (input.isDone()) {
          if (builder == null) {
            return done(recon.extant());
          } else {
            return done(builder.bind());
          }
        }
      }
      if (step == 2) {
        if (fieldParser == null) {
          fieldParser = recon.parseAttr(input);
        }
        while (fieldParser.isCont() && !input.isEmpty()) {
          fieldParser = fieldParser.feed(input);
        }
        if (fieldParser.isDone()) {
          if (builder == null) {
            builder = recon.recordBuilder();
          }
          builder.add(fieldParser.bind());
          fieldParser = null;
          step = 1;
          continue;
        } else if (fieldParser.isError()) {
          return fieldParser.asError();
        }
      }
      if (step == 3) {
        if (valueParser == null) {
          valueParser = recon.parseAdditiveOperator(input, null);
        }
        while (valueParser.isCont() && !input.isEmpty()) {
          valueParser = valueParser.feed(input);
        }
        if (valueParser.isDone()) {
          if (builder == null) {
            builder = recon.valueBuilder();
          }
          builder.add(recon.item(valueParser.bind()));
          valueParser = null;
          step = 6;
        } else if (valueParser.isError()) {
          return valueParser.asError();
        }
      }
      if (step == 4) {
        if (valueParser == null) {
          valueParser = recon.parseAdditiveOperator(input, builder);
        }
        while (valueParser.isCont() && !input.isEmpty()) {
          valueParser = valueParser.feed(input);
        }
        if (valueParser.isDone()) {
          if (builder == null) {
            builder = recon.valueBuilder();
            builder.add(recon.item(valueParser.bind()));
          }
          valueParser = null;
          step = 6;
        } else if (valueParser.isError()) {
          return valueParser.asError();
        }
      }
      if (step == 5) {
        if (valueParser == null) {
          valueParser = recon.parseAdditiveOperator(input, builder);
        }
        while (valueParser.isCont() && !input.isEmpty()) {
          valueParser = valueParser.feed(input);
        }
        if (valueParser.isDone()) {
          valueParser = null;
          step = 6;
        } else if (valueParser.isError()) {
          return valueParser.asError();
        }
      }
      if (step == 6) {
        while (input.isCont()) {
          c = input.head();
          if (Recon.isSpace(c)) {
            input = input.step();
          } else {
            break;
          }
        }
        if (input.isCont()) {
          if (c == '@') {
            step = 1;
            continue;
          } else {
            return done(builder.bind());
          }
        } else if (input.isDone()) {
          return done(builder.bind());
        }
      }
      break;
    } while (true);
    if (input.isError()) {
      return error(input.trap());
    }
    return new AttrExpressionParser(recon, builder, fieldParser, valueParser, step);
  }

  static  Parser parse(Input input, ReconParser recon, Builder builder) {
    return parse(input, recon, builder, null, null, 1);
  }
}