#include "compiler/rules/seq.h"
#include <string>
#include "compiler/rules/visitor.h"
#include "compiler/rules/blank.h"
#include "compiler/rules/metadata.h"

namespace tree_sitter {
namespace rules {

using std::make_shared;
using std::string;
using std::vector;

Seq::Seq(rule_ptr left, rule_ptr right) : left(left), right(right) {}

rule_ptr Seq::build(const std::vector<rule_ptr> &rules) {
  rule_ptr result = make_shared<Blank>();
  for (auto &rule : rules) {
    auto blank = rule->as<Blank>();
    if (blank)
      continue;

    auto metadata = rule->as<Metadata>();
    if (metadata && metadata->rule->as<Blank>())
      continue;

    if (result->as<Blank>())
      result = rule;
    else
      result = make_shared<Seq>(result, rule);
  }
  return result;
}

bool Seq::operator==(const Rule &rule) const {
  const Seq *other = rule.as<Seq>();
  return other && (*other->left == *left) && (*other->right == *right);
}

size_t Seq::hash_code() const {
  return left->hash_code() ^ right->hash_code();
}

rule_ptr Seq::copy() const {
  return std::make_shared<Seq>(*this);
}

string Seq::to_string() const {
  return string("(seq ") + left->to_string() + " " + right->to_string() + ")";
}

void Seq::accept(Visitor *visitor) const {
  visitor->visit(this);
}

}  // namespace rules
}  // namespace tree_sitter