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//===-- GoLexer.h -----------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef liblldb_GoLexer_h
#define liblldb_GoLexer_h
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringMap.h"
namespace lldb_private
{
class GoLexer
{
public:
explicit GoLexer(const char *src);
enum TokenType
{
TOK_EOF,
TOK_INVALID,
TOK_IDENTIFIER,
LIT_INTEGER,
LIT_FLOAT,
LIT_IMAGINARY,
LIT_RUNE,
LIT_STRING,
KEYWORD_BREAK,
KEYWORD_DEFAULT,
KEYWORD_FUNC,
KEYWORD_INTERFACE,
KEYWORD_SELECT,
KEYWORD_CASE,
KEYWORD_DEFER,
KEYWORD_GO,
KEYWORD_MAP,
KEYWORD_STRUCT,
KEYWORD_CHAN,
KEYWORD_ELSE,
KEYWORD_GOTO,
KEYWORD_PACKAGE,
KEYWORD_SWITCH,
KEYWORD_CONST,
KEYWORD_FALLTHROUGH,
KEYWORD_IF,
KEYWORD_RANGE,
KEYWORD_TYPE,
KEYWORD_CONTINUE,
KEYWORD_FOR,
KEYWORD_IMPORT,
KEYWORD_RETURN,
KEYWORD_VAR,
OP_PLUS,
OP_MINUS,
OP_STAR,
OP_SLASH,
OP_PERCENT,
OP_AMP,
OP_PIPE,
OP_CARET,
OP_LSHIFT,
OP_RSHIFT,
OP_AMP_CARET,
OP_PLUS_EQ,
OP_MINUS_EQ,
OP_STAR_EQ,
OP_SLASH_EQ,
OP_PERCENT_EQ,
OP_AMP_EQ,
OP_PIPE_EQ,
OP_CARET_EQ,
OP_LSHIFT_EQ,
OP_RSHIFT_EQ,
OP_AMP_CARET_EQ,
OP_AMP_AMP,
OP_PIPE_PIPE,
OP_LT_MINUS,
OP_PLUS_PLUS,
OP_MINUS_MINUS,
OP_EQ_EQ,
OP_LT,
OP_GT,
OP_EQ,
OP_BANG,
OP_BANG_EQ,
OP_LT_EQ,
OP_GT_EQ,
OP_COLON_EQ,
OP_DOTS,
OP_LPAREN,
OP_LBRACK,
OP_LBRACE,
OP_COMMA,
OP_DOT,
OP_RPAREN,
OP_RBRACK,
OP_RBRACE,
OP_SEMICOLON,
OP_COLON,
};
struct Token
{
explicit Token(TokenType t, llvm::StringRef text) : m_type(t), m_value(text) {}
TokenType m_type;
llvm::StringRef m_value;
};
const Token &Lex();
size_t
BytesRemaining() const
{
return m_end - m_src;
}
llvm::StringRef
GetString(int len) const
{
return llvm::StringRef(m_src, len);
}
static TokenType LookupKeyword(llvm::StringRef id);
static llvm::StringRef LookupToken(TokenType t);
private:
bool
IsDecimal(char c)
{
return c >= '0' && c <= '9';
}
bool
IsHexChar(char c)
{
if (c >= '0' && c <= '9')
return true;
if (c >= 'A' && c <= 'F')
return true;
if (c >= 'a' && c <= 'f')
return true;
return false;
}
bool
IsLetterOrDigit(char c)
{
if (c >= 'a' && c <= 'z')
return true;
if (c >= 'A' && c <= 'Z')
return true;
if (c == '_')
return true;
if (c >= '0' && c <= '9')
return true;
// Treat all non-ascii chars as letters for simplicity.
return 0 != (c & 0x80);
}
bool
IsWhitespace(char c)
{
switch (c)
{
case ' ':
case '\t':
case '\r':
return true;
}
return false;
}
bool SkipWhitespace();
bool SkipComment();
TokenType InternalLex(bool newline);
TokenType DoOperator();
TokenType DoIdent();
TokenType DoNumber();
TokenType DoRune();
TokenType DoString();
static llvm::StringMap<TokenType> *InitKeywords();
static llvm::StringMap<TokenType> *m_keywords;
const char *m_src;
const char *m_end;
Token m_last_token;
};
} // namespace lldb_private
#endif
|
