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This commit is contained in:
Eugen Wissner
2024-02-28 16:18:39 +01:00
parent 40f2c1eede
commit 31c178ad9c
18 changed files with 890 additions and 706 deletions
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187
source/lexer.cpp
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@@ -14,18 +14,18 @@ namespace elna
source::const_iterator source::end() const
{
source_position end_position{ 0, 0 };
Position end_position{ 0, 0 };
return source::const_iterator(std::cend(m_buffer), end_position);
}
source::const_iterator::const_iterator(std::string::const_iterator buffer,
const source_position start_position)
const Position start_position)
: m_buffer(buffer), m_position(start_position)
{
}
const source_position& source::const_iterator::position() const noexcept
const Position& source::const_iterator::position() const noexcept
{
return this->m_position;
}
@@ -73,29 +73,109 @@ namespace elna
return !(*this == that);
}
token::token(const type of, source::const_iterator begin, source::const_iterator end)
: m_type(of), m_value(begin, end)
Token::Token(const Type of, const char *value, Position position)
: m_type(of), m_position(position)
{
std::size_t value_length = strlen(value);
char *buffer = reinterpret_cast<char *>(malloc(value_length + 1));
std::memcpy(buffer, value, value_length);
buffer[value_length] = 0;
m_value.identifier = buffer;
}
Token::Token(const Type of, std::int32_t number, Position position)
: m_type(of), m_position(position)
{
m_value.number = number;
}
Token::Token(const Type of, Position position)
: m_type(of), m_position(position)
{
}
token::type token::of() const noexcept
Token::Token(const Token& that)
: m_type(that.of()), m_position(that.position())
{
*this = that;
}
Token::Token(Token&& that)
: m_type(that.of()), m_position(that.position())
{
*this = std::move(that);
}
Token::~Token()
{
if (m_type == TOKEN_IDENTIFIER || m_type == TOKEN_OPERATOR)
{
std::free(const_cast<char*>(m_value.identifier));
}
}
Token& Token::operator=(const Token& that)
{
m_type = that.of();
m_position = that.position();
if (that.of() == TOKEN_IDENTIFIER || that.of() == TOKEN_OPERATOR)
{
std::size_t value_length = strlen(that.identifier());
char *buffer = reinterpret_cast<char *>(malloc(value_length + 1));
std::memcpy(buffer, that.identifier(), value_length);
buffer[value_length] = 0;
m_value.identifier = buffer;
}
else if (that.of() == TOKEN_NUMBER)
{
m_value.number = that.number();
}
return *this;
}
Token& Token::operator=(Token&& that)
{
m_type = that.of();
m_position = that.position();
if (that.of() == TOKEN_IDENTIFIER || that.of() == TOKEN_OPERATOR)
{
m_value.identifier = that.identifier();
that.m_value.identifier = nullptr;
}
else if (that.of() == TOKEN_NUMBER)
{
m_value.number = that.number();
}
return *this;
}
Token::Type Token::of() const noexcept
{
return m_type;
}
const token::value& token::identifier() const noexcept
const char *Token::identifier() const noexcept
{
return m_value;
return m_value.identifier;
}
const source_position& token::position() const noexcept
std::int32_t Token::number() const noexcept
{
return m_value.number;
}
const Position& Token::position() const noexcept
{
return m_position;
}
result<std::vector<token>> lex(const std::string& buffer)
Token *lex(const char *buffer, CompileError *compile_error, std::size_t *length)
{
std::vector<token> tokens;
std::vector<Token> tokens;
source input{ buffer };
for (auto iterator = input.begin(); iterator != input.end();)
@@ -103,23 +183,88 @@ namespace elna
if (*iterator == ' ' || *iterator == '\n')
{
}
else if (std::isgraph(*iterator))
else if (std::isdigit(*iterator))
{
auto current_position = iterator;
do
tokens.emplace_back(
Token::TOKEN_NUMBER,
static_cast<std::int32_t>(*iterator - '0'),
iterator.position()
);
}
else if (*iterator == '=')
{
tokens.emplace_back(Token::TOKEN_EQUALS, iterator.position());
}
else if (*iterator == '(')
{
tokens.emplace_back(Token::TOKEN_LEFT_PAREN, iterator.position());
}
else if (*iterator == ')')
{
tokens.emplace_back(Token::TOKEN_RIGHT_PAREN, iterator.position());
}
else if (*iterator == ';')
{
tokens.emplace_back(Token::TOKEN_SEMICOLON, iterator.position());
}
else if (*iterator == ',')
{
tokens.emplace_back(Token::TOKEN_COMMA, iterator.position());
}
else if (*iterator == '!')
{
tokens.emplace_back(Token::TOKEN_BANG, iterator.position());
}
else if (*iterator == '.')
{
tokens.emplace_back(Token::TOKEN_DOT, iterator.position());
}
else if (std::isalpha(*iterator))
{
std::string word;
auto i = iterator;
while (i != input.end() && std::isalpha(*i))
{
++current_position;
word.push_back(*i);
++i;
}
while (current_position != input.end() && std::isgraph(*current_position));
token new_token{ token::type::word, iterator, current_position };
tokens.push_back(new_token);
iterator = current_position;
if (word == "const")
{
tokens.emplace_back(Token::TOKEN_LET, iterator.position());
}
else if (word == "var")
{
tokens.emplace_back(Token::TOKEN_VAR, iterator.position());
}
else
{
tokens.emplace_back(Token::TOKEN_IDENTIFIER, word.c_str(), iterator.position());
}
iterator = i;
continue;
}
else if (*iterator == '+' || *iterator == '-')
{
std::string _operator{ *iterator };
tokens.emplace_back(Token::TOKEN_OPERATOR, _operator.c_str(), iterator.position());
}
else
{
*compile_error = CompileError("Unexpected next character", iterator.position());
return nullptr;
}
++iterator;
}
Token *target = reinterpret_cast<Token *>(malloc(tokens.size() * sizeof(Token) + sizeof(Token)));
int i = 0;
for (auto& token : tokens)
{
target[i] = std::move(token);
++i;
}
*length = i;
return tokens;
return target;
}
}