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-rw-r--r--src/xpath.h518
1 files changed, 196 insertions, 322 deletions
diff --git a/src/xpath.h b/src/xpath.h
index 8819d49e..41dc36e4 100644
--- a/src/xpath.h
+++ b/src/xpath.h
@@ -41,6 +41,7 @@ class xpath_t
{
public:
struct op_t;
+ typedef intrusive_ptr<op_t> ptr_op_t;
static void initialize();
static void shutdown();
@@ -49,145 +50,24 @@ public:
DECLARE_EXCEPTION(compile_error);
DECLARE_EXCEPTION(calc_error);
-#if 0
- class context : public error_context {
- public:
- const xpath_t& xpath;
- const op_t * err_node;
-
- context(const xpath_t& _xpath,
- const op_t * _err_node,
- const string& desc = "") throw();
- virtual ~context() throw();
-
- virtual void describe(std::ostream& out) const throw();
- };
-#endif
-
public:
class scope_t;
- class functor_t {
- protected:
- string fname;
- public:
- bool wants_args;
-
- functor_t(const string& _fname, bool _wants_args = false)
- : fname(_fname), wants_args(_wants_args) {}
- virtual ~functor_t() {}
-
- virtual void operator()(value_t& result, scope_t * locals) = 0;
- virtual string name() const { return fname; }
- };
-
- template <typename T, typename U>
- class member_functor_t : public functor_t {
- public:
- T * ptr;
- U T::*dptr;
-
- member_functor_t(const string& _name, T * _ptr, U T::*_dptr)
- : functor_t(_name, false), ptr(_ptr), dptr(_dptr) {}
-
- virtual void operator()(value_t& result, scope_t * locals) {
- assert(ptr);
- assert(dptr);
- result = ptr->*dptr;
- }
- };
-
- template <typename T>
- class member_functor_t<T, string> : public functor_t {
- public:
- T * ptr;
- string T::*dptr;
-
- member_functor_t(const string& _name, T * _ptr, string T::*_dptr)
- : functor_t(_name, false), ptr(_ptr), dptr(_dptr) {}
-
- virtual void operator()(value_t& result, scope_t * locals) {
- assert(ptr);
- assert(dptr);
- result.set_string(ptr->*dptr);
- }
- };
-
- template <typename T>
- class memfun_functor_t : public functor_t {
- public:
- T * ptr;
- void (T::*mptr)(value_t& result);
-
- memfun_functor_t(const string& _name, T * _ptr,
- void (T::*_mptr)(value_t& result))
- : functor_t(_name, false), ptr(_ptr), mptr(_mptr) {}
-
- virtual void operator()(value_t& result, scope_t * locals = NULL) {
- assert(ptr);
- assert(mptr);
- assert(locals || locals == NULL);
- (ptr->*mptr)(result);
- }
- };
-
- template <typename T>
- class memfun_args_functor_t : public functor_t {
- public:
- T * ptr;
- void (T::*mptr)(value_t& result, scope_t * locals);
-
- memfun_args_functor_t(const string& _name, T * _ptr,
- void (T::*_mptr)(value_t& result, scope_t * locals))
- : functor_t(_name, true), ptr(_ptr), mptr(_mptr) {}
-
- virtual void operator()(value_t& result, scope_t * locals) {
- assert(ptr);
- assert(mptr);
- (ptr->*mptr)(result, locals);
- }
- };
+ typedef function<void (value_t&, scope_t *)> function_t;
- static op_t * wrap_value(const value_t& val);
- static op_t * wrap_sequence(const value_t::sequence_t& val);
- static op_t * wrap_functor(functor_t * fobj);
-#if 0
- static op_t * wrap_mask(const string& pattern);
-#endif
+#define MAKE_FUNCTOR(x) \
+ xml::xpath_t::wrap_functor(bind(&x, this, _1, _2))
- template <typename T, typename U>
- static op_t *
- make_functor(const string& name, T * ptr, U T::*mptr) {
- return wrap_functor(new member_functor_t<T, U>(name, ptr, mptr));
- }
-
- template <typename T>
- static op_t *
- make_functor(const string& fname, T * ptr,
- void (T::*mptr)(value_t& result)) {
- return wrap_functor(new memfun_functor_t<T>(fname, ptr, mptr));
- }
-
- template <typename T>
- static op_t *
- make_functor(const string& fname, T * ptr,
- void (T::*mptr)(value_t& result, scope_t * locals)) {
- return wrap_functor(new memfun_args_functor_t<T>(fname, ptr, mptr));
- }
-
-#define MAKE_FUNCTOR(cls, name) \
- xml::xpath_t::make_functor(#name, this, &cls::name)
+ static ptr_op_t wrap_value(const value_t& val);
+ static ptr_op_t wrap_sequence(const value_t::sequence_t& val);
+ static ptr_op_t wrap_functor(const function_t& fobj);
public:
- class scope_t
+ class scope_t : public noncopyable
{
- typedef std::map<const string, op_t *> symbol_map;
-
+ typedef std::map<const string, ptr_op_t> symbol_map;
symbol_map symbols;
- scope_t(const scope_t&);
- scope_t& operator=(const scope_t&);
-
public:
scope_t * parent;
value_t args;
@@ -201,23 +81,19 @@ public:
virtual ~scope_t() {
TRACE_DTOR(xpath_t::scope_t);
- for (symbol_map::iterator i = symbols.begin();
- i != symbols.end();
- i++)
- (*i).second->release();
}
public:
- virtual void define(const string& name, op_t * def);
+ virtual void define(const string& name, ptr_op_t def);
virtual bool resolve(const string& name, value_t& result,
scope_t * locals = NULL) {
if (parent)
return parent->resolve(name, result, locals);
return false;
}
- virtual op_t * lookup(const string& name);
+ virtual ptr_op_t lookup(const string& name);
- void define(const string& name, functor_t * def);
+ void define(const string& name, const function_t& def);
friend struct op_t;
};
@@ -225,15 +101,17 @@ public:
class function_scope_t : public scope_t
{
value_t::sequence_t sequence;
- value_t * value;
+ value_t value;
int index;
public:
function_scope_t(const value_t::sequence_t& _sequence,
- value_t * _value, int _index, scope_t * _parent = NULL)
+ value_t * _value, int _index,
+ scope_t * _parent = NULL)
: scope_t(_parent, STATIC),
sequence(_sequence), value(_value), index(_index) {}
- function_scope_t(value_t * _value, int _index, scope_t * _parent = NULL)
+ function_scope_t(const value_t& _value, int _index,
+ scope_t * _parent = NULL)
: scope_t(_parent, STATIC), value(_value), index(_index) {}
virtual bool resolve(const string& name, value_t& result,
@@ -245,10 +123,9 @@ public:
#define XPATH_PARSE_RELAXED 0x02
#define XPATH_PARSE_NO_MIGRATE 0x04
#define XPATH_PARSE_NO_REDUCE 0x08
-#if 0
-#define XPATH_PARSE_REGEXP 0x10
-#endif
-#define XPATH_PARSE_ALLOW_DATE 0x20
+#define XPATH_PARSE_ALLOW_DATE 0x10
+
+ typedef uint_least8_t flags_t;
private:
struct token_t
@@ -256,10 +133,6 @@ private:
enum kind_t {
IDENT, // [A-Za-z_][-A-Za-z0-9_:]*
VALUE, // any kind of literal value
-#if 0
- REGEXP, // /regexp/ jww (2006-09-24): deprecate
- // in favor of a "match" function
-#endif
AT_SYM, // @
DOLLAR, // $
DOT, // .
@@ -286,11 +159,6 @@ private:
QUESTION, // ?
COLON, // :
COMMA, // ,
-#if 0
- MATCH, // =~
- NMATCH, // !~
- PERCENT, // %
-#endif
KW_AND,
KW_OR,
KW_DIV,
@@ -336,34 +204,33 @@ private:
}
void parse_ident(std::istream& in);
- void next(std::istream& in, unsigned short flags);
+
+ void next(std::istream& in, flags_t flags);
void rewind(std::istream& in);
- void unexpected();
+ void unexpected();
static void unexpected(char c, char wanted = '\0');
};
public:
- struct op_t
+ struct op_t : public noncopyable
{
enum kind_t {
VOID,
VALUE,
- NODE_NAME,
NODE_ID,
- FUNC_NAME,
+ NODE_NAME,
+ ATTR_ID,
ATTR_NAME,
+ FUNC_NAME,
VAR_NAME,
ARG_INDEX,
CONSTANTS, // constants end here
- FUNCTOR,
-#if 0
- MASK,
-#endif
+ FUNCTION,
TERMINALS, // terminals end here
@@ -392,19 +259,10 @@ public:
O_COMMA,
-#if 0
- O_MATCH,
- O_NMATCH,
-#endif
-
O_DEFINE,
O_EVAL,
O_ARG,
-#if 0
- O_PERC,
-#endif
-
O_FIND,
O_RFIND,
O_PRED,
@@ -414,53 +272,96 @@ public:
kind_t kind;
mutable short refc;
- op_t * left;
+ ptr_op_t left_;
-#if 0
- optional<variant<value_t,
- string,
- unsigned int,
- functor_t,
- mask_t,
- op_t> > data;
-#else
- union {
- value_t * valuep; // used by constant VALUE
- string * name; // used by constant SYMBOL
- unsigned int arg_index; // used by ARG_INDEX and O_ARG
- functor_t * functor; // used by terminal FUNCTOR
- node_t::nameid_t name_id; // used by NODE_NAME and ATTR_NAME
-#if 0
- mask_t * mask; // used by terminal MASK
-#endif
- op_t * right; // used by all operators
- };
-#endif
+ variant<unsigned int, // used by ARG_INDEX and O_ARG
+ shared_ptr<value_t>, // used by constant VALUE
+ string, // used by constant SYMBOL
+ function_t, // used by terminal FUNCTION
+ node_t::nameid_t, // used by NODE_NAME and ATTR_NAME
+ ptr_op_t> // used by all binary operators
+ data;
- op_t(const kind_t _kind)
- : kind(_kind), refc(0), left(NULL), right(NULL) {
+ op_t(const kind_t _kind) : kind(_kind), refc(0){
TRACE_CTOR(xpath_t::op_t, "const kind_t");
}
- op_t(const op_t&);
- ~op_t();
+ ~op_t() {
+ TRACE_DTOR(xpath_t::op_t);
+
+ DEBUG("ledger.xpath.memory", "Destroying " << this);
+ assert(refc == 0);
+ }
op_t& operator=(const op_t&);
- bool constant() const {
+ bool is_value() const {
return kind == VALUE;
}
- void get_value(value_t& result) const;
- value_t value() const {
- value_t temp;
- get_value(temp);
- return temp;
+
+ unsigned int& as_long() {
+ assert(kind == ARG_INDEX || kind == O_ARG);
+ return boost::get<unsigned int>(data);
+ }
+ const unsigned int& as_long() const {
+ return const_cast<op_t *>(this)->as_long();
+ }
+ void set_long(unsigned int val) {
+ data = val;
}
- functor_t * functor_obj() const {
- if (kind == FUNCTOR)
- return functor;
- else
- return NULL;
+ value_t& as_value() {
+ assert(kind == VALUE);
+ value_t * val = boost::get<scoped_ptr<value_t> >(data).get();
+ assert(val);
+ return *val;
+ }
+ const value_t& as_value() const {
+ return const_cast<op_t *>(this)->as_value();
+ }
+ void set_value(value_t * val) {
+ // jww (2007-05-14): Ugh, fix this
+ data = shared_ptr<value_t>(val);
+ }
+
+ string& as_string() {
+ assert(kind == NODE_NAME || kind == ATTR_NAME || kind == FUNC_NAME);
+ return boost::get<string>(data);
+ }
+ const string& as_string() const {
+ return const_cast<op_t *>(this)->as_string();
+ }
+ void set_string(const string& val) {
+ data = val;
+ }
+
+ function_t& as_function() {
+ assert(kind == FUNCTION);
+ return boost::get<function_t>(data);
+ }
+ const function_t& as_function() const {
+ return const_cast<op_t *>(this)->as_function();
+ }
+ void set_function(const function_t& val) {
+ data = val;
+ }
+
+ node_t::nameid_t& as_name() {
+ assert(kind == NODE_ID || kind == ATTR_ID);
+ return boost::get<node_t::nameid_t>(data);
+ }
+ const node_t::nameid_t& as_name() const {
+ return const_cast<op_t *>(this)->as_name();
+ }
+ void set_name(const node_t::nameid_t& val) {
+ data = val;
+ }
+
+ ptr_op_t& as_op() {
+ assert(kind > TERMINALS);
+ return boost::get<ptr_op_t>(data);
+ }
+ const ptr_op_t& as_op() const {
+ return const_cast<op_t *>(this)->as_op();
}
void release() const {
@@ -470,54 +371,55 @@ public:
if (--refc == 0)
checked_delete(this);
}
- op_t * acquire() {
- DEBUG("ledger.xpath.memory",
- "Acquiring " << this << ", refc now " << refc + 1);
- assert(refc >= 0);
- refc++;
- return this;
- }
- const op_t * acquire() const {
+ void acquire() {
DEBUG("ledger.xpath.memory",
"Acquiring " << this << ", refc now " << refc + 1);
assert(refc >= 0);
refc++;
- return this;
}
- void set_left(op_t * expr) {
+ ptr_op_t& left() {
+ return left_;
+ }
+ const ptr_op_t& left() const {
+ assert(kind > TERMINALS);
+ return left_;
+ }
+ void set_left(const ptr_op_t& expr) {
assert(kind > TERMINALS);
- if (left)
- left->release();
- left = expr ? expr->acquire() : NULL;
+ left_ = expr;
}
- void set_right(op_t * expr) {
+ ptr_op_t& right() {
+ assert(kind > TERMINALS);
+ return as_op();
+ }
+ const ptr_op_t& right() const {
+ assert(kind > TERMINALS);
+ return as_op();
+ }
+ void set_right(const ptr_op_t& expr) {
assert(kind > TERMINALS);
- if (right)
- right->release();
- right = expr ? expr->acquire() : NULL;
+ data = expr;
}
- static op_t * new_node(kind_t kind, op_t * left = NULL,
- op_t * right = NULL);
+ static ptr_op_t new_node(kind_t kind, ptr_op_t left = NULL,
+ ptr_op_t right = NULL);
- op_t * copy(op_t * left = NULL,
- op_t * right = NULL) const;
- op_t * compile(value_t * context, scope_t * scope,
- bool resolve = false);
+ ptr_op_t copy(ptr_op_t left = NULL, ptr_op_t right = NULL) const;
+ ptr_op_t compile(value_t& context, scope_t * scope, bool resolve = false);
- void find_values(value_t * context, scope_t * scope,
+ void find_values(value_t& context, scope_t * scope,
value_t::sequence_t& result_seq, bool recursive);
- bool test_value(value_t * context, scope_t * scope, int index = 0);
+ bool test_value(value_t& context, scope_t * scope, int index = 0);
void append_value(value_t& value, value_t::sequence_t& result_seq);
- static op_t * defer_sequence(value_t::sequence_t& result_seq);
+ static ptr_op_t defer_sequence(value_t::sequence_t& result_seq);
bool print(std::ostream& out,
const bool relaxed = true,
- const op_t * op_to_find = NULL,
+ const ptr_op_t& op_to_find = NULL,
unsigned long * start_pos = NULL,
unsigned long * end_pos = NULL) const;
@@ -525,44 +427,14 @@ public:
};
public:
- op_t * ptr;
+ ptr_op_t ptr;
- xpath_t& operator=(op_t * _expr) {
+ xpath_t& operator=(ptr_op_t _expr) {
expr = "";
- reset(_expr);
+ ptr = _expr;
return *this;
}
- op_t& operator*() throw() {
- return *ptr;
- }
- const op_t& operator*() const throw() {
- return *ptr;
- }
- op_t * operator->() throw() {
- return ptr;
- }
- const op_t * operator->() const throw() {
- return ptr;
- }
-
- op_t * get() throw() { return ptr; }
- const op_t * get() const throw() { return ptr; }
-
- op_t * release() throw() {
- op_t * tmp = ptr;
- ptr = 0;
- return tmp;
- }
-
- void reset(op_t * p = 0) throw() {
- if (p != ptr) {
- if (ptr)
- ptr->release();
- ptr = p;
- }
- }
-
#ifdef THREADSAFE
mutable token_t lookahead;
#else
@@ -570,7 +442,7 @@ public:
#endif
mutable bool use_lookahead;
- token_t& next_token(std::istream& in, unsigned short tflags) const {
+ token_t& next_token(std::istream& in, flags_t tflags) const {
if (use_lookahead)
use_lookahead = false;
else
@@ -597,24 +469,24 @@ public:
use_lookahead = true;
}
- op_t * parse_value_term(std::istream& in, unsigned short flags) const;
- op_t * parse_predicate_expr(std::istream& in, unsigned short flags) const;
- op_t * parse_path_expr(std::istream& in, unsigned short flags) const;
- op_t * parse_unary_expr(std::istream& in, unsigned short flags) const;
- op_t * parse_union_expr(std::istream& in, unsigned short flags) const;
- op_t * parse_mul_expr(std::istream& in, unsigned short flags) const;
- op_t * parse_add_expr(std::istream& in, unsigned short flags) const;
- op_t * parse_logic_expr(std::istream& in, unsigned short flags) const;
- op_t * parse_and_expr(std::istream& in, unsigned short flags) const;
- op_t * parse_or_expr(std::istream& in, unsigned short flags) const;
- op_t * parse_querycolon_expr(std::istream& in, unsigned short flags) const;
- op_t * parse_value_expr(std::istream& in, unsigned short flags) const;
-
- op_t * parse_expr(std::istream& in,
- unsigned short flags = XPATH_PARSE_RELAXED) const;
-
- op_t * parse_expr(const string& str,
- unsigned short tflags = XPATH_PARSE_RELAXED) const
+ ptr_op_t parse_value_term(std::istream& in, flags_t flags) const;
+ ptr_op_t parse_predicate_expr(std::istream& in, flags_t flags) const;
+ ptr_op_t parse_path_expr(std::istream& in, flags_t flags) const;
+ ptr_op_t parse_unary_expr(std::istream& in, flags_t flags) const;
+ ptr_op_t parse_union_expr(std::istream& in, flags_t flags) const;
+ ptr_op_t parse_mul_expr(std::istream& in, flags_t flags) const;
+ ptr_op_t parse_add_expr(std::istream& in, flags_t flags) const;
+ ptr_op_t parse_logic_expr(std::istream& in, flags_t flags) const;
+ ptr_op_t parse_and_expr(std::istream& in, flags_t flags) const;
+ ptr_op_t parse_or_expr(std::istream& in, flags_t flags) const;
+ ptr_op_t parse_querycolon_expr(std::istream& in, flags_t flags) const;
+ ptr_op_t parse_value_expr(std::istream& in, flags_t flags) const;
+
+ ptr_op_t parse_expr(std::istream& in,
+ flags_t flags = XPATH_PARSE_RELAXED) const;
+
+ ptr_op_t parse_expr(const string& str,
+ flags_t tflags = XPATH_PARSE_RELAXED) const
{
std::istringstream stream(str);
#if 0
@@ -632,14 +504,14 @@ public:
#endif
}
- op_t * parse_expr(const char * p,
- unsigned short tflags = XPATH_PARSE_RELAXED) const {
+ ptr_op_t parse_expr(const char * p,
+ flags_t tflags = XPATH_PARSE_RELAXED) const {
return parse_expr(string(p), tflags);
}
bool print(std::ostream& out,
const bool relaxed,
- const op_t * op_to_find,
+ const ptr_op_t op_to_find,
unsigned long * start_pos,
unsigned long * end_pos) const {
if (ptr)
@@ -648,36 +520,34 @@ public:
}
public:
- string expr;
- unsigned short flags; // flags used to parse `expr'
+ string expr;
+ flags_t flags; // flags used to parse `expr'
xpath_t() : ptr(NULL), use_lookahead(false), flags(0) {
TRACE_CTOR(xpath_t, "");
}
- xpath_t(op_t * _ptr) : ptr(_ptr), use_lookahead(false) {
- TRACE_CTOR(xpath_t, "op_t *");
+ xpath_t(ptr_op_t _ptr) : ptr(_ptr), use_lookahead(false) {
+ TRACE_CTOR(xpath_t, "ptr_op_t");
}
- xpath_t(const string& _expr,
- unsigned short _flags = XPATH_PARSE_RELAXED)
+ xpath_t(const string& _expr, flags_t _flags = XPATH_PARSE_RELAXED)
: ptr(NULL), use_lookahead(false), flags(0) {
- TRACE_CTOR(xpath_t, "const string&, unsigned short");
+ TRACE_CTOR(xpath_t, "const string&, flags_t");
if (! _expr.empty())
parse(_expr, _flags);
}
- xpath_t(std::istream& in, unsigned short _flags = XPATH_PARSE_RELAXED)
+ xpath_t(std::istream& in, flags_t _flags = XPATH_PARSE_RELAXED)
: ptr(NULL), use_lookahead(false), flags(0) {
- TRACE_CTOR(xpath_t, "std::istream&, unsigned short");
+ TRACE_CTOR(xpath_t, "std::istream&, flags_t");
parse(in, _flags);
}
xpath_t(const xpath_t& other)
- : ptr(other.ptr ? other.ptr->acquire() : NULL),
- use_lookahead(false), expr(other.expr), flags(other.flags) {
+ : ptr(other.ptr), use_lookahead(false),
+ expr(other.expr), flags(other.flags) {
TRACE_CTOR(xpath_t, "copy");
}
virtual ~xpath_t() {
TRACE_DTOR(xpath_t);
- reset(NULL);
}
xpath_t& operator=(const string& _expr) {
@@ -686,14 +556,14 @@ public:
}
xpath_t& operator=(const xpath_t& _expr);
xpath_t& operator=(xpath_t& _xpath) {
- ptr = _xpath.ptr->acquire();
+ ptr = _xpath.ptr;
expr = _xpath.expr;
flags = _xpath.flags;
use_lookahead = false;
return *this;
}
- operator op_t *() throw() {
+ operator ptr_op_t() throw() {
return ptr;
}
@@ -704,29 +574,21 @@ public:
return expr;
}
- void parse(const string& _expr, unsigned short _flags = XPATH_PARSE_RELAXED) {
+ void parse(const string& _expr, flags_t _flags = XPATH_PARSE_RELAXED) {
expr = _expr;
flags = _flags;
- op_t * tmp = parse_expr(_expr, _flags);
- assert(tmp);
- reset(tmp ? tmp->acquire() : NULL);
+ ptr = parse_expr(_expr, _flags);
}
- void parse(std::istream& in, unsigned short _flags = XPATH_PARSE_RELAXED) {
+ void parse(std::istream& in, flags_t _flags = XPATH_PARSE_RELAXED) {
expr = "";
flags = _flags;
- op_t * tmp = parse_expr(in, _flags);
- assert(tmp);
- reset(tmp ? tmp->acquire() : NULL);
+ ptr = parse_expr(in, _flags);
}
void compile(node_t& top_node, scope_t * scope = NULL) {
- if (ptr) {
+ if (ptr.get()) {
value_t noderef(&top_node);
- op_t * compiled = ptr->compile(&noderef, scope);
- if (compiled == ptr)
- compiled->release();
- else
- reset(compiled);
+ ptr = ptr->compile(noderef, scope);
}
}
@@ -767,6 +629,13 @@ inline std::ostream& operator<<(std::ostream& out, const xpath_t::op_t& op) {
return out;
}
+inline void intrusive_ptr_add_ref(xpath_t::op_t * op) {
+ op->acquire();
+}
+inline void intrusive_ptr_release(xpath_t::op_t * op) {
+ op->release();
+}
+
} // namespace xml
template <typename T>
@@ -777,15 +646,20 @@ inline T * get_ptr(xml::xpath_t::scope_t * locals, unsigned int idx) {
return ptr;
}
-class xml_command : public xml::xpath_t::functor_t
+template <typename T>
+inline T * get_node_ptr(xml::xpath_t::scope_t * locals, unsigned int idx) {
+ assert(locals->args.size() > idx);
+ T * ptr = polymorphic_downcast<T *>(locals->args[idx].as_xml_node());
+ assert(ptr);
+ return ptr;
+}
+
+class xml_command
{
public:
- xml_command() : xml::xpath_t::functor_t("xml") {}
-
- virtual void operator()(value_t&, xml::xpath_t::scope_t * locals) {
+ void operator()(value_t&, xml::xpath_t::scope_t * locals) {
std::ostream * out = get_ptr<std::ostream>(locals, 0);
- xml::document_t * doc = get_ptr<xml::document_t>(locals, 1);
-
+ xml::document_t * doc = get_node_ptr<xml::document_t>(locals, 1);
doc->print(*out);
}
};