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xpath_stream.h
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/*
www.sourceforge.net/projects/tinyxpath
Copyright (c) 2002-2004 Yves Berquin ([email protected])
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any
damages arising from the use of this software.
Permission is granted to anyone to use this software for any
purpose, including commercial applications, and to alter it and
redistribute it freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must
not claim that you wrote the original software. If you use this
software in a product, an acknowledgment in the product documentation
would be appreciated but is not required.
2. Altered source versions must be plainly marked as such, and
must not be misrepresented as being the original software.
3. This notice may not be removed or altered from any source
distribution.
*/
/**
\file xpath_stream.h
\author Yves Berquin
Specialized byte stream for the TinyXPath project
*/
#ifndef __XPATH_STREAM_H
#define __XPATH_STREAM_H
#include <stdexcept>
#include "byte_stream.h"
#include "lex_util.h"
#include "tinyxml2.h"
#include "xpath_syntax.h"
namespace TinyXPath {
/**
A specialized version of byte_stream for XPath
*/
class xpath_stream : public byte_stream {
protected:
/// List of tokens
token_syntax_decoder* _tlp_list;
public:
/// constructor
xpath_stream(const char* cp_in);
/// destructor
virtual ~xpath_stream() {
delete _tlp_list;
}
/// Decode the byte stream, and construct the lexical list
void v_lexico_decode() {
enum { s_init, s_ncname, s_number, s_literal_1, s_literal_2, s_end } state;
lex lex_new, lex_next;
unsigned u_size;
bool o_dot_in_number;
u_size = 0;
o_dot_in_number = false;
state = s_init;
while (state != s_end) {
lex_next = lex_get_class(b_top());
switch (state) {
case s_init:
switch (lex_next) {
case lex::bchar:
case lex::under:
// [XML:4] NCName ::= (Letter | '_') (NCNameChar)*
u_size = 1;
state = s_ncname;
b_pop();
break;
case lex::null:
state = s_end;
break;
case lex::digit:
u_size = 1;
state = s_number;
o_dot_in_number = false;
b_pop();
break;
case lex::dot:
if (lex_get_class(b_forward(1)) == lex::digit) {
// [30] Number ::= Digits ('.' Digits?)? | '.' Digits
// [31] Digits ::= [0-9]+
u_size = 1;
state = s_number;
o_dot_in_number = true;
b_pop();
} else {
_tlp_list->v_add_token(lex_next, bp_get_backward(1), 1);
b_pop();
}
break;
case lex::one_quote:
// [29] Literal ::= '"' [^"]* '"' | "'" [^']* "'"
u_size = 0;
b_pop();
state = s_literal_1;
break;
case lex::two_quote:
// [29] Literal ::= '"' [^"]* '"' | "'" [^']* "'"
u_size = 0;
b_pop();
state = s_literal_2;
break;
default:
_tlp_list->v_add_token(lex_next, bp_get_backward(1), 1);
b_pop();
break;
}
break;
case s_literal_1:
// [29] Literal ::= '"' [^"]* '"' | "'" [^']* "'"
switch (lex_next) {
case lex::one_quote:
_tlp_list->v_add_token(lex::literal, bp_get_backward(u_size + 1), u_size);
b_pop();
state = s_init;
break;
default:
u_size++;
b_pop();
break;
}
break;
case s_literal_2:
// [29] Literal ::= '"' [^"]* '"' | "'" [^']* "'"
switch (lex_next) {
case lex::two_quote:
_tlp_list->v_add_token(lex::literal, bp_get_backward(u_size + 1), u_size);
b_pop();
state = s_init;
break;
default:
u_size++;
b_pop();
break;
}
break;
case s_ncname:
switch (lex_next) {
// [XML:5] NCNameChar ::= Letter | Digit | '.' | '-' | '_' | CombiningChar | Extender
case lex::bchar:
case lex::digit:
case lex::dot:
case lex::minus:
case lex::under:
case lex::extend:
u_size++;
b_pop();
break;
default:
lex_new = lex_test_id(bp_get_backward(u_size + 1), u_size, lex_next);
_tlp_list->v_add_token(lex_new, bp_get_backward(u_size + 1), u_size);
state = s_init;
break;
}
break;
case s_number:
switch (lex_next) {
// [30] Number ::= Digits ('.' Digits?)? | '.' Digits
// [31] Digits ::= [0-9]+
case lex::dot:
if (o_dot_in_number) {
_tlp_list->v_add_token(lex::number, bp_get_backward(u_size + 1), u_size);
state = s_init;
} else {
o_dot_in_number = true;
u_size++;
b_pop();
}
break;
case lex::digit:
u_size++;
b_pop();
break;
default:
_tlp_list->v_add_token(lex::number, bp_get_backward(u_size + 1), u_size);
state = s_init;
break;
}
break;
case s_end:
throw std::runtime_error("Invalid XPath expression");
}
if (lex_next == lex::null)
state = s_end;
}
}
/// Evaluate a XPath expression \n
/// Decodes the lexical and syntax contents.
void v_evaluate() {
v_lexico_decode();
_tlp_list->v_syntax_decode();
}
/// Callback used by token_syntax_decoder::v_syntax_decode to notify of an action to be made. Pure virtual
virtual void v_action(xpath_construct, xpath_sub, lex, const char*) = 0;
/// Callback used by token_syntax_decoder::v_syntax_decode to know the action counter position. Pure virtual
/// \n This can be any kind of nomenclature, provided that the redefinition is coherent
virtual int i_get_action_counter() = 0;
}; // class xpath_stream
} // namespace TinyXPath
#endif // __XPATH_STREAM_H