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lexertk.hpp
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/*
*****************************************************************
* Simple C++ Lexer Toolkit Library *
* *
* Author: Arash Partow (2001) *
* URL: http://www.partow.net/programming/lexertk/index.html *
* *
* Copyright notice: *
* Free use of the Simple C++ Lexer Toolkit Library is permitted *
* under the guidelines and in accordance with the MIT License. *
* http://www.opensource.org/licenses/MIT *
* *
* *
* The lexer will tokenize input against the following BNF: *
* *
* expression ::= term { +|- term } *
* term ::= (symbol | factor) {operator symbol | factor} *
* factor ::= symbol | ( '(' {-} expression ')' ) *
* symbol ::= number | gensymb | string *
* gensymb ::= alphabet {alphabet | digit} *
* string ::= '"' {alphabet | digit | operator } '"' *
* operator ::= * | / | % | ^ | < | > | <= | >= | << | >> != *
* alphabet ::= a | b | .. | z | A | B | .. | Z *
* digit ::= 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 *
* sign ::= + | - *
* edef ::= e | E *
* decimal ::= {digit} (digit [.] | [.] digit) {digit} *
* exponent ::= edef [sign] digit {digit} *
* real ::= [sign] decimal [exponent] *
* integer ::= [sign] {digit} *
* number ::= real | integer *
* *
* *
* Note: This lexer has been taken from the ExprTk Library. *
* *
*****************************************************************
*/
#ifndef INCLUDE_LEXERTK_HPP
#define INCLUDE_LEXERTK_HPP
#include <algorithm>
#include <cctype>
#include <cstddef>
#include <cstdio>
#include <cstdlib>
#include <deque>
#include <exception>
#include <limits>
#include <map>
#include <set>
#include <stack>
#include <stdexcept>
#include <string>
namespace lexertk
{
namespace details
{
inline bool is_whitespace(const char c)
{
return (' ' == c) || ('\n' == c) ||
('\r' == c) || ('\t' == c) ||
('\b' == c) || ('\v' == c) ||
('\f' == c) ;
}
inline bool is_operator_char(const char c)
{
return ('+' == c) || ('-' == c) ||
('*' == c) || ('/' == c) ||
('^' == c) || ('<' == c) ||
('>' == c) || ('=' == c) ||
(',' == c) || ('!' == c) ||
('(' == c) || (')' == c) ||
('[' == c) || (']' == c) ||
('{' == c) || ('}' == c) ||
('%' == c) || (':' == c) ||
('?' == c) || ('&' == c) ||
('|' == c) || (';' == c);
}
inline bool is_letter(const char c)
{
return (('a' <= c) && (c <= 'z')) || (('A' <= c) && (c <= 'Z'));
}
inline bool is_digit(const char c)
{
return ('0' <= c) && (c <= '9');
}
inline bool is_letter_or_digit(const char c)
{
return is_letter(c) || is_digit(c);
}
inline bool is_left_bracket(const char c)
{
return ('(' == c) || ('[' == c) || ('{' == c);
}
inline bool is_right_bracket(const char c)
{
return (')' == c) || (']' == c) || ('}' == c);
}
inline bool is_bracket(const char c)
{
return is_left_bracket(c) || is_right_bracket(c);
}
inline bool is_sign(const char c)
{
return ('+' == c) || ('-' == c);
}
inline bool is_invalid(const char c)
{
return !is_whitespace(c) &&
!is_operator_char(c) &&
!is_letter(c) &&
!is_digit(c) &&
('.' != c) &&
('_' != c) &&
('$' != c) &&
('~' != c) &&
('\'' != c);
}
inline bool imatch(const char c1, const char c2)
{
return std::tolower(c1) == std::tolower(c2);
}
inline bool imatch(const std::string& s1, const std::string& s2)
{
if (s1.size() == s2.size())
{
for (std::size_t i = 0; i < s1.size(); ++i)
{
if (std::tolower(s1[i]) != std::tolower(s2[i]))
{
return false;
}
}
return true;
}
return false;
}
struct ilesscompare
{
inline bool operator()(const std::string& s1, const std::string& s2) const
{
const std::size_t length = std::min(s1.size(),s2.size());
for (std::size_t i = 0; i < length; ++i)
{
if (std::tolower(s1[i]) > std::tolower(s2[i]))
return false;
else if (std::tolower(s1[i]) < std::tolower(s2[i]))
return true;
}
return s1.size() < s2.size();
}
};
inline void cleanup_escapes(std::string& s)
{
typedef std::string::iterator str_itr_t;
str_itr_t itr1 = s.begin();
str_itr_t itr2 = s.begin();
str_itr_t end = s.end ();
std::size_t removal_count = 0;
while (end != itr1)
{
if ('\\' == (*itr1))
{
++removal_count;
if (end == ++itr1)
break;
else if ('\\' != (*itr1))
{
switch (*itr1)
{
case 'n' : (*itr1) = '\n'; break;
case 'r' : (*itr1) = '\r'; break;
case 't' : (*itr1) = '\t'; break;
}
continue;
}
}
if (itr1 != itr2)
{
(*itr2) = (*itr1);
}
++itr1;
++itr2;
}
s.resize(s.size() - removal_count);
}
}
struct token
{
enum token_type
{
e_none = 0, e_error = 1, e_err_symbol = 2,
e_err_number = 3, e_err_string = 4, e_err_sfunc = 5,
e_eof = 6, e_number = 7, e_symbol = 8,
e_string = 9, e_assign = 10, e_shr = 11,
e_shl = 12, e_lte = 13, e_ne = 14,
e_gte = 15, e_lt = '<', e_gt = '>',
e_eq = '=', e_rbracket = ')', e_lbracket = '(',
e_rsqrbracket = ']', e_lsqrbracket = '[', e_rcrlbracket = '}',
e_lcrlbracket = '{', e_comma = ',', e_add = '+',
e_sub = '-', e_div = '/', e_mul = '*',
e_mod = '%', e_pow = '^', e_colon = ':'
};
token()
: type(e_none),
value(""),
position(std::numeric_limits<std::size_t>::max())
{}
void clear()
{
type = e_none;
value = "";
position = std::numeric_limits<std::size_t>::max();
}
template <typename Iterator>
inline token& set_operator(const token_type tt, const Iterator begin, const Iterator end, const Iterator base_begin = Iterator(0))
{
type = tt;
value.assign(begin,end);
if (base_begin)
position = std::distance(base_begin,begin);
return *this;
}
template <typename Iterator>
inline token& set_symbol(const Iterator begin, const Iterator end, const Iterator base_begin = Iterator(0))
{
type = e_symbol;
value.assign(begin,end);
if (base_begin)
position = std::distance(base_begin,begin);
return *this;
}
template <typename Iterator>
inline token& set_numeric(const Iterator begin, const Iterator end, const Iterator base_begin = Iterator(0))
{
type = e_number;
value.assign(begin,end);
if (base_begin)
position = std::distance(base_begin,begin);
return *this;
}
template <typename Iterator>
inline token& set_string(const Iterator begin, const Iterator end, const Iterator base_begin = Iterator(0))
{
type = e_string;
value.assign(begin,end);
if (base_begin)
position = std::distance(base_begin,begin);
return *this;
}
inline token& set_string(const std::string& s, const std::size_t p)
{
type = e_string;
value = s;
position = p;
return *this;
}
template <typename Iterator>
inline token& set_error(const token_type et, const Iterator begin, const Iterator end, const Iterator base_begin = Iterator(0))
{
if (
(e_error == et) ||
(e_err_symbol == et) ||
(e_err_number == et) ||
(e_err_string == et)
)
{
type = e_error;
}
else
type = e_error;
value.assign(begin,end);
if (base_begin)
position = std::distance(base_begin,begin);
return *this;
}
static inline std::string to_str(token_type t)
{
switch (t)
{
case e_none : return "NONE";
case e_error : return "ERROR";
case e_err_symbol : return "ERROR_SYMBOL";
case e_err_number : return "ERROR_NUMBER";
case e_err_string : return "ERROR_STRING";
case e_eof : return "EOF";
case e_number : return "NUMBER";
case e_symbol : return "SYMBOL";
case e_string : return "STRING";
case e_assign : return ":=";
case e_shr : return ">>";
case e_shl : return "<<";
case e_lte : return "<=";
case e_ne : return "!=";
case e_gte : return ">=";
case e_lt : return "<";
case e_gt : return ">";
case e_eq : return "=";
case e_rbracket : return ")";
case e_lbracket : return "(";
case e_rsqrbracket : return "]";
case e_lsqrbracket : return "[";
case e_rcrlbracket : return "}";
case e_lcrlbracket : return "{";
case e_comma : return ",";
case e_add : return "+";
case e_sub : return "-";
case e_div : return "/";
case e_mul : return "*";
case e_mod : return "%";
case e_pow : return "^";
case e_colon : return ":";
default : return "UNKNOWN";
}
}
inline bool is_error() const
{
return (
(e_error == type) ||
(e_err_symbol == type) ||
(e_err_number == type) ||
(e_err_string == type)
);
}
token_type type;
std::string value;
std::size_t position;
};
class generator
{
public:
typedef token token_t;
typedef std::deque<token_t> token_list_t;
typedef std::deque<token_t>::iterator token_list_itr_t;
generator()
: base_itr_(0),
s_itr_(0),
s_end_(0)
{
clear();
}
inline void clear()
{
base_itr_ = 0;
s_itr_ = 0;
s_end_ = 0;
token_list_.clear();
token_itr_ = token_list_.end();
store_token_itr_ = token_list_.end();
}
inline bool process(const std::string& str)
{
base_itr_ = str.data();
s_itr_ = str.data();
s_end_ = str.data() + str.size();
eof_token_.set_operator(token_t::e_eof,s_end_,s_end_,base_itr_);
token_list_.clear();
while (!is_end(s_itr_))
{
scan_token();
if (token_list_.empty())
return true;
else if (token_list_.back().is_error())
{
return false;
}
}
return true;
}
inline bool empty() const
{
return token_list_.empty();
}
inline std::size_t size() const
{
return token_list_.size();
}
inline void begin()
{
token_itr_ = token_list_.begin();
store_token_itr_ = token_list_.begin();
}
inline void store()
{
store_token_itr_ = token_itr_;
}
inline void restore()
{
token_itr_ = store_token_itr_;
}
inline token_t& next_token()
{
if (token_list_.end() != token_itr_)
{
return *token_itr_++;
}
else
return eof_token_;
}
inline token_t& peek_next_token()
{
if (token_list_.end() != token_itr_)
{
return *token_itr_;
}
else
return eof_token_;
}
inline token_t& operator[](const std::size_t& index)
{
if (index < token_list_.size())
return token_list_[index];
else
return eof_token_;
}
inline token_t operator[](const std::size_t& index) const
{
if (index < token_list_.size())
return token_list_[index];
else
return eof_token_;
}
inline bool finished() const
{
return (token_list_.end() == token_itr_);
}
inline std::string remaining() const
{
if (finished())
return "";
else if (token_list_.begin() != token_itr_)
return std::string(base_itr_ + (token_itr_ - 1)->position,s_end_);
else
return std::string(base_itr_ + token_itr_->position,s_end_);
}
private:
inline bool is_end(const char* itr)
{
return (s_end_ == itr);
}
inline void skip_whitespace()
{
while (!is_end(s_itr_) && details::is_whitespace(*s_itr_))
{
++s_itr_;
}
}
inline void skip_comments()
{
//The following comment styles are supported:
// 1. // .... \n
// 2. # .... \n
// 3. /* .... */
struct test
{
static inline bool comment_start(const char c0, const char c1, int& mode, int& incr)
{
mode = 0;
if ('#' == c0) { mode = 1; incr = 1; }
else if ('/' == c0)
{
if ('/' == c1) { mode = 1; incr = 2; }
else if ('*' == c1) { mode = 2; incr = 2; }
}
return (mode != 0);
}
static inline bool comment_end(const char c0, const char c1, const int mode)
{
return ((1 == mode) && ('\n' == c0)) ||
((2 == mode) && ( '*' == c0) && ('/' == c1));
}
};
int mode = 0;
int increment = 0;
if (is_end(s_itr_) || is_end((s_itr_ + 1)))
return;
else if (!test::comment_start(*s_itr_,*(s_itr_ + 1),mode,increment))
return;
s_itr_ += increment;
while (!is_end(s_itr_) && !test::comment_end(*s_itr_,*(s_itr_ + 1),mode))
{
++s_itr_;
}
if (!is_end(s_itr_))
{
s_itr_ += mode;
skip_whitespace();
skip_comments();
}
}
inline void scan_token()
{
skip_whitespace();
skip_comments();
if (is_end(s_itr_))
{
return;
}
else if (details::is_operator_char(*s_itr_))
{
scan_operator();
return;
}
else if (details::is_letter(*s_itr_))
{
scan_symbol();
return;
}
else if (details::is_digit((*s_itr_)) || ('.' == (*s_itr_)))
{
scan_number();
return;
}
else if ('\'' == (*s_itr_))
{
scan_string();
return;
}
else
{
token_t t;
t.set_error(token::e_error,s_itr_,s_itr_ + 2,base_itr_);
token_list_.push_back(t);
++s_itr_;
}
}
inline void scan_operator()
{
token_t t;
if (!is_end(s_itr_ + 1))
{
token_t::token_type ttype = token_t::e_none;
char c0 = s_itr_[0];
char c1 = s_itr_[1];
if ((c0 == '<') && (c1 == '=')) ttype = token_t::e_lte;
else if ((c0 == '>') && (c1 == '=')) ttype = token_t::e_gte;
else if ((c0 == '<') && (c1 == '>')) ttype = token_t::e_ne;
else if ((c0 == '!') && (c1 == '=')) ttype = token_t::e_ne;
else if ((c0 == '=') && (c1 == '=')) ttype = token_t::e_eq;
else if ((c0 == ':') && (c1 == '=')) ttype = token_t::e_assign;
else if ((c0 == '<') && (c1 == '<')) ttype = token_t::e_shl;
else if ((c0 == '>') && (c1 == '>')) ttype = token_t::e_shr;
if (token_t::e_none != ttype)
{
t.set_operator(ttype,s_itr_,s_itr_ + 2,base_itr_);
token_list_.push_back(t);
s_itr_ += 2;
return;
}
}
if ('<' == *s_itr_)
t.set_operator(token_t::e_lt ,s_itr_,s_itr_ + 1,base_itr_);
else if ('>' == *s_itr_)
t.set_operator(token_t::e_gt ,s_itr_,s_itr_ + 1,base_itr_);
else if (';' == *s_itr_)
t.set_operator(token_t::e_eof,s_itr_,s_itr_ + 1,base_itr_);
else if ('&' == *s_itr_)
t.set_symbol(s_itr_,s_itr_ + 1,base_itr_);
else if ('|' == *s_itr_)
t.set_symbol(s_itr_,s_itr_ + 1,base_itr_);
else
t.set_operator(token_t::token_type(*s_itr_),s_itr_,s_itr_ + 1,base_itr_);
token_list_.push_back(t);
++s_itr_;
}
inline void scan_symbol()
{
const char* begin = s_itr_;
while (
(!is_end(s_itr_)) &&
(details::is_letter_or_digit(*s_itr_) || ((*s_itr_) == '_'))
)
{
++s_itr_;
}
token_t t;
t.set_symbol(begin,s_itr_,base_itr_);
token_list_.push_back(t);
}
inline void scan_number()
{
/*
Attempt to match a valid numeric value in one of the following formats:
01. 123456
02. 123.456
03. 123.456e3
04. 123.456E3
05. 123.456e+3
06. 123.456E+3
07. 123.456e-3
08. 123.456E-3
09. .1234
10. .1234e3
11. .1234E+3
12. .1234e+3
13. .1234E-3
14. .1234e-3
*/
const char* begin = s_itr_;
bool dot_found = false;
bool e_found = false;
bool post_e_sign_found = false;
bool post_e_digit_found = false;
token_t t;
while (!is_end(s_itr_))
{
if ('.' == (*s_itr_))
{
if (dot_found)
{
t.set_error(token::e_err_number,begin,s_itr_,base_itr_);
token_list_.push_back(t);
return;
}
dot_found = true;
++s_itr_;
continue;
}
else if (details::imatch('e',(*s_itr_)))
{
const char& c = *(s_itr_ + 1);
if (is_end(s_itr_ + 1))
{
t.set_error(token::e_err_number,begin,s_itr_,base_itr_);
token_list_.push_back(t);
return;
}
else if (
('+' != c) &&
('-' != c) &&
!details::is_digit(c)
)
{
t.set_error(token::e_err_number,begin,s_itr_,base_itr_);
token_list_.push_back(t);
return;
}
e_found = true;
++s_itr_;
continue;
}
else if (e_found && details::is_sign(*s_itr_) && !post_e_digit_found)
{
if (post_e_sign_found)
{
t.set_error(token::e_err_number,begin,s_itr_,base_itr_);
token_list_.push_back(t);
return;
}
post_e_sign_found = true;
++s_itr_;
continue;
}
else if (e_found && details::is_digit(*s_itr_))
{
post_e_digit_found = true;
++s_itr_;
continue;
}
else if (('.' != (*s_itr_)) && !details::is_digit(*s_itr_))
break;
else
++s_itr_;
}
t.set_numeric(begin,s_itr_,base_itr_);
token_list_.push_back(t);
return;
}
inline void scan_string()
{
const char* begin = s_itr_ + 1;
token_t t;
if (std::distance(s_itr_,s_end_) < 2)
{
t.set_error(token::e_err_string,s_itr_,s_end_,base_itr_);
token_list_.push_back(t);
return;
}
++s_itr_;
bool escaped_found = false;
bool escaped = false;
while (!is_end(s_itr_))
{
if (!escaped && ('\\' == *s_itr_))
{
escaped_found = true;
escaped = true;
++s_itr_;
continue;
}
else if (!escaped)
{
if ('\'' == *s_itr_)
break;
}
else if (escaped)
escaped = false;
++s_itr_;
}
if (is_end(s_itr_))
{
t.set_error(token::e_err_string,begin,s_itr_,base_itr_);
token_list_.push_back(t);
return;
}
if (!escaped_found)
t.set_string(begin,s_itr_,base_itr_);
else
{
std::string parsed_string(begin,s_itr_);
details::cleanup_escapes(parsed_string);
t.set_string(parsed_string, std::distance(base_itr_,begin));
}
token_list_.push_back(t);
++s_itr_;
return;
}
private:
token_list_t token_list_;
token_list_itr_t token_itr_;
token_list_itr_t store_token_itr_;
token_t eof_token_;
const char* base_itr_;
const char* s_itr_;
const char* s_end_;
friend class token_scanner;
friend class token_modifier;
friend class token_inserter;
friend class token_joiner;
};
class helper_interface
{
public:
virtual void init() { }
virtual void reset() { }
virtual bool result() { return true; }
virtual std::size_t process(generator&) { return 0; }
virtual ~helper_interface() { }
};
class token_scanner : public helper_interface
{
public:
virtual ~token_scanner()
{}
explicit token_scanner(const std::size_t& stride)
: stride_(stride)
{
if (stride > 4)
{
throw std::invalid_argument("token_scanner() - Invalid stride value");
}
}
inline std::size_t process(generator& g)
{
if (!g.token_list_.empty())
{
for (std::size_t i = 0; i < (g.token_list_.size() - stride_ + 1); ++i)
{
token t;
switch (stride_)
{
case 1 :
{
const token& t0 = g.token_list_[i];
if (!operator()(t0)) return i;
}
break;
case 2 :
{
const token& t0 = g.token_list_[i ];
const token& t1 = g.token_list_[i + 1];
if (!operator()(t0,t1)) return i;
}
break;
case 3 :
{
const token& t0 = g.token_list_[i ];
const token& t1 = g.token_list_[i + 1];
const token& t2 = g.token_list_[i + 2];
if (!operator()(t0,t1,t2)) return i;
}
break;
case 4 :
{
const token& t0 = g.token_list_[i ];
const token& t1 = g.token_list_[i + 1];
const token& t2 = g.token_list_[i + 2];
const token& t3 = g.token_list_[i + 3];
if (!operator()(t0,t1,t2,t3)) return i;
}
break;
}
}
}
return (g.token_list_.size() - stride_ + 1);
}
virtual bool operator()(const token&)
{
return false;
}
virtual bool operator()(const token&, const token&)
{
return false;
}
virtual bool operator()(const token&, const token&, const token&)
{
return false;
}
virtual bool operator()(const token&, const token&, const token&, const token&)
{
return false;
}
private:
std::size_t stride_;
};
class token_modifier : public helper_interface
{
public:
inline std::size_t process(generator& g)
{
std::size_t changes = 0;
for (std::size_t i = 0; i < g.token_list_.size(); ++i)
{
if (modify(g.token_list_[i])) changes++;
}
return changes;
}
virtual bool modify(token& t) = 0;
};
class token_inserter : public helper_interface
{
public:
explicit token_inserter(const std::size_t& stride)
: stride_(stride)
{
if (stride > 5)
{
throw std::invalid_argument("token_inserter() - Invalid stride value");
}
}
inline std::size_t process(generator& g)
{
if (g.token_list_.empty())
return 0;
std::size_t changes = 0;
for (std::size_t i = 0; i < (g.token_list_.size() - stride_ + 1); ++i)
{
token t;