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#ifndef LEX_HPP_INCLUDED
#define LEX_HPP_INCLUDED
#include "../types.hpp"
#include <string>
#include <fstream>
enum eTokenType
{
TOK_NULL,
TOK_EOF,
TOK_WHITESPACE,
TOK_COMMENT,
// Value tokens
TOK_IDENT,
TOK_MACRO,
TOK_LIFETIME,
TOK_INTEGER,
TOK_CHAR,
TOK_FLOAT,
TOK_CATTR_OPEN,
TOK_ATTR_OPEN,
// Symbols
TOK_PAREN_OPEN, TOK_PAREN_CLOSE,
TOK_BRACE_OPEN, TOK_BRACE_CLOSE,
TOK_LT, TOK_GT,
TOK_SQUARE_OPEN,TOK_SQUARE_CLOSE,
TOK_COMMA,
TOK_SEMICOLON,
TOK_COLON,
TOK_DOUBLE_COLON,
TOK_STAR, TOK_AMP,
TOK_PIPE,
TOK_FATARROW, // =>
TOK_THINARROW, // ->
TOK_PLUS, TOK_DASH,
TOK_EXCLAM,
TOK_PERCENT,
TOK_SLASH,
TOK_DOT,
TOK_DOUBLE_DOT,
TOK_TRIPLE_DOT,
TOK_EQUAL,
TOK_PLUS_EQUAL,
TOK_DASH_EQUAL,
TOK_PERCENT_EQUAL,
TOK_SLASH_EQUAL,
TOK_STAR_EQUAL,
TOK_AMP_EQUAL,
TOK_PIPE_EQUAL,
TOK_DOUBLE_EQUAL,
TOK_EXCLAM_EQUAL,
TOK_GTE,
TOK_LTE,
TOK_DOUBLE_AMP,
TOK_DOUBLE_PIPE,
TOK_DOUBLE_LT,
TOK_DOUBLE_GT,
TOK_QMARK,
TOK_AT,
TOK_TILDE,
TOK_BACKSLASH,
TOK_CARET,
TOK_BACKTICK,
// Reserved Words
TOK_RWORD_PUB,
TOK_RWORD_PRIV,
TOK_RWORD_MUT,
TOK_RWORD_CONST,
TOK_RWORD_STATIC,
TOK_RWORD_UNSAFE,
TOK_RWORD_EXTERN,
TOK_RWORD_CRATE,
TOK_RWORD_MOD,
TOK_RWORD_STRUCT,
TOK_RWORD_ENUM,
TOK_RWORD_TRAIT,
TOK_RWORD_FN,
TOK_RWORD_USE,
TOK_RWORD_IMPL,
TOK_RWORD_TYPE,
TOK_RWORD_WHERE,
TOK_RWORD_AS,
TOK_RWORD_LET,
TOK_RWORD_MATCH,
TOK_RWORD_IF,
TOK_RWORD_ELSE,
TOK_RWORD_LOOP,
TOK_RWORD_WHILE,
TOK_RWORD_FOR,
TOK_RWORD_IN,
TOK_RWORD_DO,
TOK_RWORD_CONTINUE,
TOK_RWORD_BREAK,
TOK_RWORD_RETURN,
TOK_RWORD_YIELD,
TOK_RWORD_BOX,
TOK_RWORD_REF,
TOK_RWORD_FALSE,
TOK_RWORD_TRUE,
TOK_RWORD_SELF,
TOK_RWORD_SUPER,
TOK_RWORD_PROC,
TOK_RWORD_MOVE,
TOK_RWORD_ONCE,
TOK_RWORD_ABSTRACT,
TOK_RWORD_FINAL,
TOK_RWORD_PURE,
TOK_RWORD_OVERRIDE,
TOK_RWORD_VIRTUAL,
TOK_RWORD_ALIGNOF,
TOK_RWORD_OFFSETOF,
TOK_RWORD_SIZEOF,
TOK_RWORD_TYPEOF,
TOK_RWORD_BE,
TOK_RWORD_UNSIZED,
};
class Token
{
enum eTokenType m_type;
::std::string m_str;
enum eCoreType m_datatype;
union {
uint64_t m_intval;
double m_floatval;
};
public:
Token();
Token(enum eTokenType type);
Token(enum eTokenType type, ::std::string str);
Token(uint64_t val, enum eCoreType datatype);
Token(double val, enum eCoreType datatype);
enum eTokenType type() const { return m_type; }
const ::std::string& str() const { return m_str; }
enum eCoreType datatype() const { return m_datatype; }
uint64_t intval() const { return m_intval; }
double floatval() const { return m_floatval; }
static const char* typestr(enum eTokenType type);
};
extern ::std::ostream& operator<<(::std::ostream& os, Token& tok);
class TokenStream
{
bool m_cache_valid;
Token m_cache;
public:
TokenStream();
virtual ~TokenStream();
Token getToken();
void putback(Token tok);
protected:
virtual Token realGetToken() = 0;
};
class Lexer
{
::std::ifstream m_istream;
bool m_last_char_valid;
char m_last_char;
public:
Lexer(::std::string filename);
Token getToken();
private:
signed int getSymbol();
uint32_t parseEscape(char enclosing);
char getc();
void putback();
class EndOfFile {};
};
class TokenTree
{
Token m_tok;
::std::vector<TokenTree> m_subtrees;
public:
TokenTree() {}
TokenTree(Token tok):
m_tok(tok)
{
}
TokenTree(::std::vector<TokenTree> subtrees):
m_subtrees(subtrees)
{
}
const unsigned int size() const {
return m_subtrees.size();
}
const TokenTree& operator[](unsigned int idx) const {
return m_subtrees[idx];
}
const Token& tok() const {
return m_tok;
}
};
class TTStream:
public TokenStream
{
const TokenTree& m_input_tt;
::std::vector< ::std::pair<unsigned int, const TokenTree*> > m_stack;
public:
TTStream(const TokenTree& input_tt);
~TTStream();
protected:
virtual Token realGetToken();
};
#endif // LEX_HPP_INCLUDED
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