path: root/liblangutil/Token.h

// Copyright 2006-2012, the V8 project authors. All rights reserved.
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//
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#pragma once

#include <libdevcore/Common.h>
#include <liblangutil/Exceptions.h>
#include <liblangutil/UndefMacros.h>

#include <iosfwd>
#include <string>
#include <tuple>

namespace langutil
{

// 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(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(AssignBitOr, "|=", 2)                                           \
    T(AssignBitXor, "^=", 2)                                          \
    T(AssignBitAnd, "&=", 2)                                          \
    T(AssignShl, "<<=", 2)                                            \
    T(AssignSar, ">>=", 2)                                            \
    T(AssignShr, ">>>=", 2)                                           \
    T(AssignAdd, "+=", 2)                                             \
    T(AssignSub, "-=", 2)                                             \
    T(AssignMul, "*=", 2)                                             \
    T(AssignDiv, "/=", 2)                                             \
    T(AssignMod, "%=", 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(BitOr, "|", 8)                                                   \
    T(BitXor, "^", 9)                                                  \
    T(BitAnd, "&", 10)                                                 \
    T(SHL, "<<", 11)                                                   \
    T(SAR, ">>", 11)                                                   \
    T(SHR, ">>>", 11)                                                  \
    T(Add, "+", 12)                                                    \
    T(Sub, "-", 12)                                                    \
    T(Mul, "*", 13)                                                    \
    T(Div, "/", 13)                                                    \
    T(Mod, "%", 13)                                                    \
    T(Exp, "**", 14)                                                   \
    \
    /* Compare operators sorted by precedence. */                      \
    /* IsCompareOp() relies on this block of enum values */            \
    /* being contiguous and sorted in the same order! */               \
    T(Equal, "==", 6)                                                  \
    T(NotEqual, "!=", 6)                                               \
    T(LessThan, "<", 7)                                                \
    T(GreaterThan, ">", 7)                                             \
    T(LessThanOrEqual, "<=", 7)                                        \
    T(GreaterThanOrEqual, ">=", 7)                                     \
    \
    /* Unary operators. */                                             \
    /* IsUnaryOp() relies on this block of enum values */              \
    /* being contiguous and sorted in the same order! */               \
    T(Not, "!", 0)                                                     \
    T(BitNot, "~", 0)                                                  \
    T(Inc, "++", 0)                                                    \
    T(Dec, "--", 0)                                                    \
    K(Delete, "delete", 0)                                             \
    \
    /* Keywords */                                                     \
    K(Anonymous, "anonymous", 0)                                       \
    K(As, "as", 0)                                                     \
    K(Assembly, "assembly", 0)                                         \
    K(Break, "break", 0)                                               \
    K(Constant, "constant", 0)                                         \
    K(Constructor, "constructor", 0)                                   \
    K(Continue, "continue", 0)                                         \
    K(Contract, "contract", 0)                                         \
    K(Do, "do", 0)                                                     \
    K(Else, "else", 0)                                                 \
    K(Enum, "enum", 0)                                                 \
    K(Emit, "emit", 0)                                                 \
    K(Event, "event", 0)                                               \
    K(External, "external", 0)                                         \
    K(For, "for", 0)                                                   \
    K(Function, "function", 0)                                         \
    K(Hex, "hex", 0)                                                   \
    K(If, "if", 0)                                                     \
    K(Indexed, "indexed", 0)                                           \
    K(Interface, "interface", 0)                                       \
    K(Internal, "internal", 0)                                         \
    K(Import, "import", 0)                                             \
    K(Is, "is", 0)                                                     \
    K(Library, "library", 0)                                           \
    K(Mapping, "mapping", 0)                                           \
    K(Memory, "memory", 0)                                             \
    K(Modifier, "modifier", 0)                                         \
    K(New, "new", 0)                                                   \
    K(Payable, "payable", 0)                                           \
    K(Public, "public", 0)                                             \
    K(Pragma, "pragma", 0)                                             \
    K(Private, "private", 0)                                           \
    K(Pure, "pure", 0)                                                 \
    K(Return, "return", 0)                                             \
    K(Returns, "returns", 0)                                           \
    K(Storage, "storage", 0)                                           \
    K(CallData, "calldata", 0)                                         \
    K(Struct, "struct", 0)                                             \
    K(Throw, "throw", 0)                                               \
    K(Using, "using", 0)                                               \
    K(Var, "var", 0)                                                   \
    K(View, "view", 0)                                                 \
    K(While, "while", 0)                                               \
    \
    /* Ether subdenominations */                                       \
    K(SubWei, "wei", 0)                                                \
    K(SubSzabo, "szabo", 0)                                            \
    K(SubFinney, "finney", 0)                                          \
    K(SubEther, "ether", 0)                                            \
    K(SubSecond, "seconds", 0)                                         \
    K(SubMinute, "minutes", 0)                                         \
    K(SubHour, "hours", 0)                                             \
    K(SubDay, "days", 0)                                               \
    K(SubWeek, "weeks", 0)                                             \
    K(SubYear, "years", 0)                                             \
    /* type keywords*/                                                 \
    K(Int, "int", 0)                                                   \
    K(UInt, "uint", 0)                                                 \
    K(Bytes, "bytes", 0)                                               \
    K(Byte, "byte", 0)                                                 \
    K(String, "string", 0)                                             \
    K(Address, "address", 0)                                           \
    K(Bool, "bool", 0)                                                 \
    K(Fixed, "fixed", 0)                                               \
    K(UFixed, "ufixed", 0)                                             \
    T(IntM, "intM", 0)                                                 \
    T(UIntM, "uintM", 0)                                               \
    T(BytesM, "bytesM", 0)                                             \
    T(FixedMxN, "fixedMxN", 0)                                         \
    T(UFixedMxN, "ufixedMxN", 0)                                       \
    T(TypesEnd, NULL, 0) /* used as type enum end marker */            \
    \
    /* Literals */                                                     \
    K(TrueLiteral, "true", 0)                                          \
    K(FalseLiteral, "false", 0)                                        \
    T(Number, NULL, 0)                                                 \
    T(StringLiteral, NULL, 0)                                          \
    T(CommentLiteral, NULL, 0)                                         \
    \
    /* Identifiers (not keywords or future reserved words). */         \
    T(Identifier, NULL, 0)                                             \
    \
    /* Keywords reserved for future use. */                            \
    K(Abstract, "abstract", 0)                                         \
    K(After, "after", 0)                                               \
    K(Alias, "alias", 0)                                               \
    K(Apply, "apply", 0)                                               \
    K(Auto, "auto", 0)                                                 \
    K(Case, "case", 0)                                                 \
    K(Catch, "catch", 0)                                               \
    K(CopyOf, "copyof", 0)                                             \
    K(Default, "default", 0)                                           \
    K(Define, "define", 0)                                             \
    K(Final, "final", 0)                                               \
    K(Immutable, "immutable", 0)                                       \
    K(Implements, "implements", 0)                                     \
    K(In, "in", 0)                                                     \
    K(Inline, "inline", 0)                                             \
    K(Let, "let", 0)                                                   \
    K(Macro, "macro", 0)                                               \
    K(Match, "match", 0)                                               \
    K(Mutable, "mutable", 0)                                           \
    K(NullLiteral, "null", 0)                                          \
    K(Of, "of", 0)                                                     \
    K(Override, "override", 0)                                         \
    K(Partial, "partial", 0)                                           \
    K(Promise, "promise", 0)                                           \
    K(Reference, "reference", 0)                                       \
    K(Relocatable, "relocatable", 0)                                   \
    K(Sealed, "sealed", 0)                                             \
    K(Sizeof, "sizeof", 0)                                             \
    K(Static, "static", 0)                                             \
    K(Supports, "supports", 0)                                         \
    K(Switch, "switch", 0)                                             \
    K(Try, "try", 0)                                                   \
    K(Type, "type", 0)                                                 \
    K(Typedef, "typedef", 0)                                           \
    K(TypeOf, "typeof", 0)                                             \
    K(Unchecked, "unchecked", 0)                                       \
    \
    /* Illegal token - not able to scan. */                            \
    T(Illegal, "ILLEGAL", 0)                                           \
    /* Illegal hex token */                                            \
    T(IllegalHex, "ILLEGAL_HEX", 0)                                    \
    \
    /* Scanner-internal use only. */                                   \
    T(Whitespace, NULL, 0)

// All token values.
// attention! msvc issue:
// http://stackoverflow.com/questions/9567868/compile-errors-after-adding-v8-to-my-project-c2143-c2059
// @todo: avoid TOKEN_LIST macro
enum class Token : unsigned int {
#define T(name, string, precedence) name,
    TOKEN_LIST(T, T)
    NUM_TOKENS
#undef T
};

namespace TokenTraits
{
    constexpr size_t count() { return static_cast<size_t>(Token::NUM_TOKENS); }

    // Predicates
    constexpr bool isElementaryTypeName(Token tok) { return Token::Int <= tok && tok < Token::TypesEnd; }
    constexpr bool isAssignmentOp(Token tok) { return Token::Assign <= tok && tok <= Token::AssignMod; }
    constexpr bool isBinaryOp(Token op) { return Token::Comma <= op && op <= Token::Exp; }
    constexpr bool isCommutativeOp(Token op) { return op == Token::BitOr || op == Token::BitXor || op == Token::BitAnd ||
         op == Token::Add || op == Token::Mul || op == Token::Equal || op == Token::NotEqual; }
    constexpr bool isArithmeticOp(Token op) { return Token::Add <= op && op <= Token::Exp; }
    constexpr bool isCompareOp(Token op) { return Token::Equal <= op && op <= Token::GreaterThanOrEqual; }

    constexpr bool isBitOp(Token op) { return (Token::BitOr <= op && op <= Token::BitAnd) || op == Token::BitNot; }
    constexpr bool isBooleanOp(Token op) { return (Token::Or <= op && op <= Token::And) || op == Token::Not; }
    constexpr bool isUnaryOp(Token op) { return (Token::Not <= op && op <= Token::Delete) || op == Token::Add || op == Token::Sub; }
    constexpr bool isCountOp(Token op) { return op == Token::Inc || op == Token::Dec; }
    constexpr bool isShiftOp(Token op) { return (Token::SHL <= op) && (op <= Token::SHR); }
    constexpr bool isVariableVisibilitySpecifier(Token op) { return op == Token::Public || op == Token::Private || op == Token::Internal; }
    constexpr bool isVisibilitySpecifier(Token op) { return isVariableVisibilitySpecifier(op) || op == Token::External; }
    constexpr bool isLocationSpecifier(Token op) { return op == Token::Memory || op == Token::Storage || op == Token::CallData; }

    constexpr bool isStateMutabilitySpecifier(Token op, bool _allowConstant = true)
    {
        return (op == Token::Constant && _allowConstant)
            || op == Token::Pure || op == Token::View || op == Token::Payable;
    }

    constexpr bool isEtherSubdenomination(Token op) { return op == Token::SubWei || op == Token::SubSzabo || op == Token::SubFinney || op == Token::SubEther; }
    constexpr bool isTimeSubdenomination(Token op) { return op == Token::SubSecond || op == Token::SubMinute || op == Token::SubHour || op == Token::SubDay || op == Token::SubWeek || op == Token::SubYear; }
    constexpr bool isReservedKeyword(Token op) { return (Token::Abstract <= op && op <= Token::Unchecked); }

    inline Token AssignmentToBinaryOp(Token op)
    {
        solAssert(isAssignmentOp(op) && op != Token::Assign, "");
        return static_cast<Token>(static_cast<int>(op) + (static_cast<int>(Token::BitOr) - static_cast<int>(Token::AssignBitOr)));
    }

    // @returns the precedence > 0 for binary and compare
    // operators; returns 0 otherwise.
    int precedence(Token tok);

    std::tuple<Token, unsigned int, unsigned int> fromIdentifierOrKeyword(std::string const& _literal);

    // @returns a string corresponding to the C++ token name
    // (e.g. "LT" for the token LT).
    char const* name(Token tok);

    // @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).
    char const* toString(Token tok);

    std::string friendlyName(Token tok);
}

inline std::ostream& operator<<(std::ostream& os, Token token)
{
    os << TokenTraits::friendlyName(token);
    return os;
}

class ElementaryTypeNameToken
{
public:
    ElementaryTypeNameToken(Token _token, unsigned const& _firstNumber, unsigned const& _secondNumber)
    {
        assertDetails(_token, _firstNumber, _secondNumber);
    }

    unsigned int firstNumber() const { return m_firstNumber; }
    unsigned int secondNumber() const { return m_secondNumber; }
    Token token() const { return m_token; }

    ///if tokValue is set to true, then returns the actual token type name, otherwise, returns full type
    std::string toString(bool const& tokenValue = false) const
    {
        std::string name = TokenTraits::toString(m_token);
        if (tokenValue || (firstNumber() == 0 && secondNumber() == 0))
            return name;
        solAssert(name.size() >= 3, "Token name size should be greater than 3. Should not reach here.");
        if (m_token == Token::FixedMxN || m_token == Token::UFixedMxN)
            return name.substr(0, name.size() - 3) + std::to_string(m_firstNumber) + "x" + std::to_string(m_secondNumber);
        else
            return name.substr(0, name.size() - 1) + std::to_string(m_firstNumber);
    }

private:
    Token m_token;
    unsigned int m_firstNumber;
    unsigned int m_secondNumber;
    /// throws if type is not properly sized
    void assertDetails(Token _baseType, unsigned const& _first, unsigned const& _second);
};

}