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#!/usr/bin/python2.4
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"""o3d binding model module.
This module implements the glue functions for the o3d binding model, binding
O3D objects.
In C++, objects using this binding model are passed and returned by pointer.
For example
void SetValue(Class *value);
Class *GetValue();
For JS bindings, the browser object holds an id, representing the C++ object
through that can be accessed through the Client object.
"""
import string
import cpp_utils
import java_utils
class CallingConstructor(Exception):
"""Raised when trying to call a constructor on an O3D object."""
pass
def JavaMemberString(scope, type_defn):
"""Gets the representation of a member name in Java.
Args:
scope: a Definition for the scope in which the expression will be written.
type_defn: a Definition for the type.
Returns:
a string representing the type
"""
return java_utils.GetScopedName(scope, type_defn)
def CppTypedefString(scope, type_defn):
"""Gets the representation of a type when used in a C++ typedef.
Args:
scope: a Definition for the scope in which the expression will be written.
type_defn: a Definition for the type.
Returns:
a (string, boolean) pair, the first element being the representation of
the type, the second element indicating whether or not the definition of
the type is needed for the expression to be valid.
"""
return cpp_utils.GetScopedName(scope, type_defn), False
def CppMemberString(scope, type_defn):
"""Gets the representation of a type when used as a C++ class member.
Args:
scope: a Definition for the scope in which the expression will be written.
type_defn: a Definition for the type.
Returns:
a (string, boolean) pair, the first element being the representation of
the type, the second element indicating whether or not the definition of
the type is needed for the expression to be valid.
"""
return '%s*' % cpp_utils.GetScopedName(scope, type_defn), False
def CppReturnValueString(scope, type_defn):
"""Gets the representation of a type when used as a C++ function return value.
Args:
scope: a Definition for the scope in which the expression will be written.
type_defn: a Definition for the type.
Returns:
a (string, boolean) pair, the first element being the representation of
the type, the second element indicating whether or not the definition of
the type is needed for the expression to be valid.
"""
return '%s*' % cpp_utils.GetScopedName(scope, type_defn), False
def CppParameterString(scope, type_defn):
"""Gets the representation of a type when used for a function parameter.
Args:
scope: a Definition for the scope in which the expression will be written.
type_defn: a Definition for the type.
Returns:
a (string, boolean) pair, the first element being the representation of
the type, the second element indicating whether or not the definition of
the type is needed for the expression to be valid.
"""
return '%s*' % cpp_utils.GetScopedName(scope, type_defn), False
def CppMutableParameterString(scope, type_defn):
"""Gets the representation of a type for a mutable function parameter.
Args:
scope: a Definition for the scope in which the expression will be written.
type_defn: a Definition for the type.
Returns:
a (string, boolean) pair, the first element being the string representing
the type, the second element indicating whether or not the definition of
the type is needed for the expression to be valid.
"""
return '%s*' % cpp_utils.GetScopedName(scope, type_defn), False
def CppMutableToNonMutable(scope, type_defn, expr):
"""Gets the string converting a mutable expression to a non-mutable one.
Args:
scope: a Definition for the scope in which the expression will be written.
type_defn: a Definition for the type.
expr: a string for the mutable expression.
Returns:
a string, which is the non-mutable expression.
"""
(scope, type_defn) = (scope, type_defn) # silence gpylint.
return expr
def CppBaseClassString(scope, type_defn):
"""Gets the representation of a type for a base class.
Args:
scope: a Definition for the scope in which the expression will be written.
type_defn: a Definition for the type.
Returns:
a (string, boolean) pair, the first element being the string representing
the type, the second element indicating whether or not the definition of
the type is needed for the expression to be valid.
"""
return cpp_utils.GetScopedName(scope, type_defn)
def CppCallMethod(scope, type_defn, object_expr, mutable, method, param_exprs):
"""Gets the representation of a member function call.
Args:
scope: a Definition for the scope in which the expression will be written.
type_defn: a Definition, representing the type of the object being called.
object_expr: a string, which is the expression for the object being called.
mutable: a boolean, whether or not the 'object_expr' expression is mutable
or not
method: a Function, representing the function to call.
param_exprs: a list of strings, each being the expression for the value of
each parameter.
Returns:
a string, which is the expression for the function call.
"""
(scope, type_defn, mutable) = (scope, type_defn, mutable) # silence gpylint.
return '%s->%s(%s)' % (object_expr, method.name, ', '.join(param_exprs))
def CppCallStaticMethod(scope, type_defn, method, param_exprs):
"""Gets the representation of a static function call.
Args:
scope: a Definition for the scope in which the expression will be written.
type_defn: a Definition, representing the type of the object being called.
method: a Function, representing the function to call.
param_exprs: a list of strings, each being the expression for the value of
each parameter.
Returns:
a string, which is the expression for the function call.
"""
return '%s::%s(%s)' % (cpp_utils.GetScopedName(scope, type_defn),
method.name, ', '.join(param_exprs))
def CppCallConstructor(scope, type_defn, method, param_exprs):
"""Gets the representation of a constructor call.
Args:
scope: a Definition for the scope in which the expression will be written.
type_defn: a Definition, representing the type of the object being called.
method: a Function, representing the constructor to call.
param_exprs: a list of strings, each being the expression for the value of
each parameter.
Returns:
a string, which is the expression for the constructor call.
Raises:
CallingConstructor: always. O3D objects can't be constructed directly.
"""
raise CallingConstructor
def CppSetField(scope, type_defn, object_expr, field, param_expr):
"""Gets the representation of an expression setting a field in an object.
Args:
scope: a Definition for the scope in which the expression will be written.
type_defn: a Definition, representing the type of the object containing the
field being set.
object_expr: a string, which is the expression for the object containing
the field being set.
field: a string, the name of the field to be set.
param_expr: a strings, being the expression for the value to be set.
Returns:
a string, which is the expression for setting the field.
"""
(scope, type_defn) = (scope, type_defn) # silence gpylint.
return '%s->%s(%s)' % (object_expr, cpp_utils.GetSetterName(field),
param_expr)
def CppGetField(scope, type_defn, object_expr, field):
"""Gets the representation of an expression getting a field in an object.
Args:
scope: a Definition for the scope in which the expression will be written.
type_defn: a Definition, representing the type of the object containing the
field being retrieved.
object_expr: a string, which is the expression for the object containing
the field being retrieved.
field: a string, the name of the field to be retrieved.
Returns:
a string, which is the expression for getting the field.
"""
(scope, type_defn) = (scope, type_defn) # silence gpylint.
return '%s->%s()' % (object_expr, cpp_utils.GetGetterName(field))
def CppSetStatic(scope, type_defn, field, param_expr):
"""Gets the representation of an expression setting a static field.
Args:
scope: a Definition for the scope in which the expression will be written.
type_defn: a Definition, representing the type of the object containing the
field being set.
field: a string, the name of the field to be set.
param_expr: a strings, being the expression for the value to be set.
Returns:
a string, which is the expression for setting the field.
"""
return '%s::%s(%s)' % (cpp_utils.GetScopedName(scope, type_defn),
cpp_utils.GetSetterName(field), param_expr)
def CppGetStatic(scope, type_defn, field):
"""Gets the representation of an expression getting a static field.
Args:
scope: a Definition for the scope in which the expression will be written.
type_defn: a Definition, representing the type of the object containing the
field being retrieved.
field: a string, the name of the field to be retrieved.
Returns:
a string, which is the expression for getting the field.
"""
return '%s::%s()' % (cpp_utils.GetScopedName(scope, type_defn),
cpp_utils.GetGetterName(field))
def JSDocTypeString(type_defn):
"""Gets the representation of a type in JSDoc notation.
Args:
type_defn: a Definition for the type.
Returns:
a string that is the JSDoc notation of type_defn.
"""
type_defn = type_defn.GetFinalType()
type_stack = type_defn.GetParentScopeStack()
name = type_defn.name
return '!' + '.'.join([s.name for s in type_stack[1:]] + [name])
_binding_glue_header_template = string.Template('')
def NpapiBindingGlueHeader(scope, type_defn):
"""Gets the NPAPI glue header for a given type.
Args:
scope: a Definition for the scope in which the glue will be written.
type_defn: a Definition, representing the type.
Returns:
a string, the glue header.
"""
class_name = cpp_utils.GetScopedName(scope, type_defn)
return _binding_glue_header_template.substitute(Class=class_name)
_binding_glue_cpp_template = string.Template("""
void InitializeGlue(NPP npp) {
InitializeIds(npp);
glue::_o3d::RegisterType(npp, ${Class}::GetApparentClass(), &npclass);
}
glue::_o3d::NPAPIObject *GetNPObject(NPP npp, ${Class}* object) {
return glue::_o3d::GetNPObject(npp, object);
}
static NPObject *Allocate(NPP npp, NPClass *theClass) {
return glue::_o3d::Allocate(npp, theClass);
}
static void Deallocate(NPObject *header) {
return glue::_o3d::Deallocate(header);
}
""")
def NpapiBindingGlueCpp(scope, type_defn):
"""Gets the NPAPI glue implementation for a given type.
Args:
scope: a Definition for the scope in which the glue will be written.
type_defn: a Definition, representing the type.
Returns:
a string, the glue implementation.
"""
class_name = cpp_utils.GetScopedName(scope, type_defn)
return _binding_glue_cpp_template.substitute(Class=class_name)
dispatch_function_header_template = string.Template("""
glue::_o3d::NPAPIObject *${variable_npobject} =
static_cast<glue::_o3d::NPAPIObject *>(header);
NPP ${npp} = ${variable_npobject}->npp();
${Class} *${variable} = glue::_o3d::GetClient(
${npp})->GetById<${Class}>(${variable_npobject}->id());
${result} = (${variable} != NULL);
if (!${result}) {
O3D_ERROR(glue::_o3d::GetServiceLocator(${npp})) <<
"Invalid object; perhaps it's been destroyed already?";
}
""")
def NpapiDispatchFunctionHeader(scope, type_defn, variable, npp, success):
"""Gets a header for NPAPI glue dispatch functions.
This function creates a string containing a C++ code snippet that should be
included at the beginning of NPAPI glue dispatch functions like Invoke or
GetProperty. This code snippet will declare and initialize certain variables
that will be used in the dispatch functions, like the NPObject representing
the object, or a pointer to the NPP instance.
Args:
scope: a Definition for the scope in which the glue will be written.
type_defn: a Definition, representing the type.
variable: a string, representing a name of a variable that can be used to
store a reference to the object.
npp: a string, representing the name of the variable that holds the pointer
to the NPP instance. Will be declared by the code snippet.
success: the name of a bool variable containing the current success status.
(is not declared by the code snippet).
Returns:
a (string, string) pair, the first string being the code snippet, and the
second string being an expression to access the object.
"""
class_name = cpp_utils.GetScopedName(scope, type_defn)
variable_npobject = '%s_npobject' % variable
text = dispatch_function_header_template.substitute(
variable_npobject=variable_npobject, npp=npp, variable=variable,
Class=class_name, result=success)
return text, variable
from_npvariant_template = string.Template("""
${Class} *${variable} = NULL;
if (NPVARIANT_IS_OBJECT(${input})) {
NPObject *npobject = NPVARIANT_TO_OBJECT(${input});
if (glue::_o3d::CheckObject(npp, npobject,
${Class}::GetApparentClass())) {
glue::_o3d::NPAPIObject *client_object =
static_cast<glue::_o3d::NPAPIObject *>(npobject);
${variable} =
glue::_o3d::GetClient(${npp})->GetById<${Class}>(
client_object->id());
if (${variable} == NULL) {
${result} = false;
*error_handle = "Error in " ${context}
": input wasn't a valid object from this plugin instance.";
} else {
${result} = true;
}
} else {
*error_handle = "Error in " ${context}
": invalid type.";
${result} = false;
}
} else {
*error_handle = "Error in " ${context}
": was expecting an object.";
${result} = false;
}
""")
def NpapiFromNPVariant(scope, type_defn, input_expr, variable, success,
exception_context, npp):
"""Gets the string to get a value from a NPVariant.
This function creates a string containing a C++ code snippet that is used to
retrieve a value from a NPVariant. If an error occurs, like if the NPVariant
is not of the correct type, the snippet will set the success status variable
to false and set *error_handle with an appropriate error message.
Args:
scope: a Definition for the scope in which the glue will be written.
type_defn: a Definition, representing the type of the value.
input_expr: an expression representing the NPVariant to get the value from.
variable: a string, representing a name of a variable that can be used to
store a reference to the value.
success: the name of a bool variable containing the current success status.
exception_context: the name of a string containing context information, for
use in exception reporting.
npp: a string, representing the name of the variable that holds the pointer
to the NPP instance.
Returns:
a (string, string) pair, the first string being the code snippet and the
second one being the expression to access that value.
"""
class_name = cpp_utils.GetScopedName(scope, type_defn)
text = from_npvariant_template.substitute(Class=class_name,
variable=variable,
input=input_expr,
npp=npp,
result=success,
context=exception_context)
return (text, variable)
expr_to_npobject_template = string.Template("""
glue::_o3d::NPAPIObject *${variable} =
glue::_o3d::GetNPObject(${npp}, ${expr});
if (!${variable}) {
*error_handle = "Error : type cannot be null.";
${result} = false;
}
""")
npobject_to_npvariant_template = string.Template("""
OBJECT_TO_NPVARIANT(${variable}, *${output});
""")
def NpapiExprToNPVariant(scope, type_defn, variable, expression, output,
success, npp):
"""Gets the string to store a value into a NPVariant.
This function creates a string containing a C++ code snippet that is used to
store a value into a NPVariant. That operation takes two phases, one that
allocates necessary NPAPI resources, and that can fail, and one that actually
sets the NPVariant (that can't fail). If an error occurs, the snippet will
set the success status variable to false.
Args:
scope: a Definition for the scope in which the glue will be written.
type_defn: a Definition, representing the type of the value.
variable: a string, representing a name of a variable that can be used to
store a reference to the value.
expression: a string representing the expression that yields the value to
be stored.
output: an expression representing a pointer to the NPVariant to store the
value into.
success: the name of a bool variable containing the current success status.
npp: a string, representing the name of the variable that holds the pointer
to the NPP instance.
Returns:
a (string, string) pair, the first string being the code snippet for the
first phase, and the second one being the code snippet for the second phase.
"""
(scope, type_defn) = (scope, type_defn) # silence gpylint.
phase_1_text = expr_to_npobject_template.substitute(variable=variable,
npp=npp,
expr=expression,
result=success)
phase_2_text = npobject_to_npvariant_template.substitute(
variable=variable,
output=output,
result=success)
return phase_1_text, phase_2_text
def main():
pass
if __name__ == '__main__':
main()