path: root/Token.h

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#pragma once

#include <boost/assert.hpp>

#include <libdevcore/Common.h>
#include <libdevcore/Log.h>

namespace dev
{
namespace solidity
{

// TOKEN_LIST takes a list of 3 macros M, all of which satisfy the
// same signature M(name, string, precedence), where name is the
// symbolic token name, string is the corresponding syntactic symbol
// (or NULL, for literals), and precedence is the precedence (or 0).
// The parameters are invoked for token categories as follows:
//
//   T: Non-keyword tokens
//   K: Keyword tokens

// IGNORE_TOKEN is a convenience macro that can be supplied as
// an argument (at any position) for a TOKEN_LIST call. It does
// nothing with tokens belonging to the respective category.

#define IGNORE_TOKEN(name, string, precedence)

#define TOKEN_LIST(T, K)                                               \
    /* End of source indicator. */                                     \
    T(EOS, "EOS", 0)                                                   \
    \
    /* Punctuators (ECMA-262, section 7.7, page 15). */                \
    T(LPAREN, "(", 0)                                                  \
    T(RPAREN, ")", 0)                                                  \
    T(LBRACK, "[", 0)                                                  \
    T(RBRACK, "]", 0)                                                  \
    T(LBRACE, "{", 0)                                                  \
    T(RBRACE, "}", 0)                                                  \
    T(COLON, ":", 0)                                                   \
    T(SEMICOLON, ";", 0)                                               \
    T(PERIOD, ".", 0)                                                  \
    T(CONDITIONAL, "?", 3)                                             \
    T(INC, "++", 0)                                                    \
    T(DEC, "--", 0)                                                    \
    T(ARROW, "=>", 0)                                                  \
    \
    /* Assignment operators. */                                        \
    /* IsAssignmentOp() relies on this block of enum values being */   \
    /* contiguous and sorted in the same order!*/                      \
    T(ASSIGN, "=", 2)                                                  \
    /* The following have to be in exactly the same order as the simple binary operators*/ \
    T(ASSIGN_BIT_OR, "|=", 2)                                          \
    T(ASSIGN_BIT_XOR, "^=", 2)                                         \
    T(ASSIGN_BIT_AND, "&=", 2)                                         \
    T(ASSIGN_SHL, "<<=", 2)                                            \
    T(ASSIGN_SAR, ">>=", 2)                                            \
    T(ASSIGN_SHR, ">>>=", 2)                                           \
    T(ASSIGN_ADD, "+=", 2)                                             \
    T(ASSIGN_SUB, "-=", 2)                                             \
    T(ASSIGN_MUL, "*=", 2)                                             \
    T(ASSIGN_DIV, "/=", 2)                                             \
    T(ASSIGN_MOD, "%=", 2)                                             \
    \
    /* Binary operators sorted by precedence. */                       \
    /* IsBinaryOp() relies on this block of enum values */             \
    /* being contiguous and sorted in the same order! */               \
    T(COMMA, ",", 1)                                                   \
    T(OR, "||", 4)                                                     \
    T(AND, "&&", 5)                                                    \
    T(BIT_OR, "|", 6)                                                  \
    T(BIT_XOR, "^", 7)                                                 \
    T(BIT_AND, "&", 8)                                                 \
    T(SHL, "<<", 11)                                                   \
    T(SAR, ">>", 11)                                                   \
    T(SHR, ">>>", 11)                                                  \
    T(ADD, "+", 12)                                                    \
    T(SUB, "-", 12)                                                    \
    T(MUL, "*", 13)                                                    \
    T(DIV, "/", 13)                                                    \
    T(MOD, "%", 13)                                                    \
    \
    /* Compare operators sorted by precedence. */                      \
    /* IsCompareOp() relies on this block of enum values */            \
    /* being contiguous and sorted in the same order! */               \
    T(EQ, "==", 9)                                                     \
    T(NE, "!=", 9)                                                     \
    T(LT, "<", 10)                                                     \
    T(GT, ">", 10)                                                     \
    T(LTE, "<=", 10)                                                   \
    T(GTE, ">=", 10)                                                   \
    K(IN, "in", 10)                                                    \
    \
    /* Unary operators. */                                             \
    /* IsUnaryOp() relies on this block of enum values */              \
    /* being contiguous and sorted in the same order! */               \
    T(NOT, "!", 0)                                                     \
    T(BIT_NOT, "~", 0)                                                 \
    K(DELETE, "delete", 0)                                             \
    \
    /* Keywords */                                                     \
    K(BREAK, "break", 0)                                               \
    K(CASE, "case", 0)                                                 \
    K(CONST, "const", 0)                                               \
    K(CONTINUE, "continue", 0)                                         \
    K(CONTRACT, "contract", 0)                                         \
    K(DEFAULT, "default", 0)                                           \
    K(DO, "do", 0)                                                     \
    K(ELSE, "else", 0)                                                 \
    K(EXTENDS, "extends", 0)                                           \
    K(FOR, "for", 0)                                                   \
    K(FUNCTION, "function", 0)                                         \
    K(IF, "if", 0)                                                     \
    K(IMPORT, "import", 0)                                             \
    K(MAPPING, "mapping", 0)                                           \
    K(NEW, "new", 0)                                                   \
    K(PUBLIC, "public", 0)                                             \
    K(PRIVATE, "private", 0)                                           \
    K(RETURN, "return", 0)                                             \
    K(RETURNS, "returns", 0)                                           \
    K(STRUCT, "struct", 0)                                             \
    K(SWITCH, "switch", 0)                                             \
    K(THIS, "this", 0)                                                 \
    K(VAR, "var", 0)                                                   \
    K(WHILE, "while", 0)                                               \
    \
    \
    /* type keywords, keep them in this order, keep int as first keyword
     * the implementation in Types.cpp has to be synced to this here
     *  TODO more to be added */                                       \
    K(INT, "int", 0)                                                   \
    K(INT32, "int32", 0)                                               \
    K(INT64, "int64", 0)                                               \
    K(INT128, "int128", 0)                                             \
    K(INT256, "int256", 0)                                             \
    K(UINT, "uint", 0)                                                 \
    K(UINT32, "uint32", 0)                                             \
    K(UINT64, "uint64", 0)                                             \
    K(UINT128, "uint128", 0)                                           \
    K(UINT256, "uint256", 0)                                           \
    K(HASH, "hash", 0)                                                 \
    K(HASH32, "hash32", 0)                                             \
    K(HASH64, "hash64", 0)                                             \
    K(HASH128, "hash128", 0)                                           \
    K(HASH256, "hash256", 0)                                           \
    K(ADDRESS, "address", 0)                                           \
    K(BOOL, "bool", 0)                                                 \
    K(STRING_TYPE, "string", 0)                                        \
    K(TEXT, "text", 0)                                                 \
    K(REAL, "real", 0)                                                 \
    K(UREAL, "ureal", 0)                                               \
    T(TYPES_END, NULL, 0) /* used as type enum end marker */           \
    \
    /* Literals */                                                     \
    K(NULL_LITERAL, "null", 0)                                         \
    K(TRUE_LITERAL, "true", 0)                                         \
    K(FALSE_LITERAL, "false", 0)                                       \
    T(NUMBER, NULL, 0)                                                 \
    T(STRING_LITERAL, NULL, 0)                                         \
    \
    /* Identifiers (not keywords or future reserved words). */         \
    T(IDENTIFIER, NULL, 0)                                             \
    \
    /* Illegal token - not able to scan. */                            \
    T(ILLEGAL, "ILLEGAL", 0)                                           \
    \
    /* Scanner-internal use only. */                                   \
    T(WHITESPACE, NULL, 0)


class Token
{
public:
    // All token values.
#define T(name, string, precedence) name,
    enum Value
    {
        TOKEN_LIST(T, T)
        NUM_TOKENS
    };
#undef T

    // Returns a string corresponding to the C++ token name
    // (e.g. "LT" for the token LT).
    static char const* getName(Value tok)
    {
        BOOST_ASSERT(tok < NUM_TOKENS);  // tok is unsigned
        return m_name[tok];
    }

    // Predicates
    static bool isKeyword(Value tok) { return m_tokenType[tok] == 'K'; }
    static bool isIdentifier(Value tok) { return tok == IDENTIFIER; }
    static bool isElementaryTypeName(Value tok) { return INT <= tok && tok < TYPES_END; }
    static bool isAssignmentOp(Value tok) { return ASSIGN <= tok && tok <= ASSIGN_MOD; }
    static bool isBinaryOp(Value op) { return COMMA <= op && op <= MOD; }
    static bool isTruncatingBinaryOp(Value op) { return BIT_OR <= op && op <= SHR; }
    static bool isCompareOp(Value op) { return EQ <= op && op <= IN; }
    static bool isOrderedRelationalCompareOp(Value op)
    {
        return op == LT || op == LTE || op == GT || op == GTE;
    }
    static bool isEqualityOp(Value op) { return op == EQ; }
    static bool isInequalityOp(Value op) { return op == NE; }
    static bool isArithmeticCompareOp(Value op)
    {
        return isOrderedRelationalCompareOp(op) ||
               isEqualityOp(op) || isInequalityOp(op);
    }

    static Value negateCompareOp(Value op)
    {
        BOOST_ASSERT(isArithmeticCompareOp(op));
        switch (op)
        {
        case EQ:
            return NE;
        case NE:
            return EQ;
        case LT:
            return GTE;
        case GT:
            return LTE;
        case LTE:
            return GT;
        case GTE:
            return LT;
        default:
            BOOST_ASSERT(false); // should not get here
            return op;
        }
    }

    static Value reverseCompareOp(Value op)
    {
        BOOST_ASSERT(isArithmeticCompareOp(op));
        switch (op)
        {
        case EQ:
            return EQ;
        case NE:
            return NE;
        case LT:
            return GT;
        case GT:
            return LT;
        case LTE:
            return GTE;
        case GTE:
            return LTE;
        default:
            BOOST_ASSERT(false); // should not get here
            return op;
        }
    }

    static Value AssignmentToBinaryOp(Value op)
    {
        BOOST_ASSERT(isAssignmentOp(op) && op != ASSIGN);
        return Token::Value(op + (BIT_OR - ASSIGN_BIT_OR));
    }

    static bool isBitOp(Value op) { return (BIT_OR <= op && op <= SHR) || op == BIT_NOT; }
    static bool isUnaryOp(Value op) { return (NOT <= op && op <= DELETE) || op == ADD || op == SUB; }
    static bool isCountOp(Value op) { return op == INC || op == DEC; }
    static bool isShiftOp(Value op) { return (SHL <= op) && (op <= SHR); }

    // Returns a string corresponding to the JS token string
    // (.e., "<" for the token LT) or NULL if the token doesn't
    // have a (unique) string (e.g. an IDENTIFIER).
    static char const* toString(Value tok)
    {
        BOOST_ASSERT(tok < NUM_TOKENS);  // tok is unsigned.
        return m_string[tok];
    }

    // Returns the precedence > 0 for binary and compare
    // operators; returns 0 otherwise.
    static int precedence(Value tok)
    {
        BOOST_ASSERT(tok < NUM_TOKENS);  // tok is unsigned.
        return m_precedence[tok];
    }

private:
    static char const* const m_name[NUM_TOKENS];
    static char const* const m_string[NUM_TOKENS];
    static int8_t const m_precedence[NUM_TOKENS];
    static char const m_tokenType[NUM_TOKENS];
};

}
}