65 lines
1.5 KiB
C++
65 lines
1.5 KiB
C++
#include "environment.hh"
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#include "../error_handler.hh"
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#include <algorithm>
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#include <memory>
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#include <utility>
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Environment::Environment(const Environment &other) : enclosing{other.enclosing}, values{other.values} {}
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Environment::Environment(Environment &&other) noexcept
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: enclosing{std::move(other.enclosing)}, values{std::move(other.values)} {}
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Environment &Environment::operator=(const Environment &other) {
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if (this == &other) {
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return *this;
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}
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enclosing = other.enclosing;
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values = other.values;
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return *this;
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}
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Environment &Environment::operator=(Environment &&other) noexcept {
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if (this == &other) {
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return *this;
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}
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enclosing = std::move(other.enclosing);
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values = std::move(other.values);
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other.enclosing.reset();
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return *this;
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}
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void Environment::define(const std::string &name, const Object &value) {
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values.insert(std::pair(name, value));
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}
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void Environment::assign(const Token &name, const Object &value) {
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if (values.find(name.lexeme) != values.end()) {
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values.at(name.lexeme) = value;
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return;
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}
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if (enclosing != nullptr) {
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enclosing->assign(name, value);
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return;
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}
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throw RuntimeException(name, "Undefined variable '" + name.lexeme + "'.");
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}
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Object Environment::get(const Token &name) {
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if (values.find(name.lexeme) != values.end()) {
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return values.at(name.lexeme);
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}
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if (enclosing != nullptr) {
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return enclosing->get(name);
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}
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throw RuntimeException(name, "Undefined variable '" + name.lexeme + "'.");
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}
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