libcmo21/CodeGen/BMapBindings/VariableType.java
yyc12345 a2fb376231 feat: add csharp interop code generation but no test.
- add csharp interop code generation without testing.
- add annotation for bmap binding project.
- fix README.
2024-04-23 16:01:26 +08:00

154 lines
4.2 KiB
Java

import java.util.Collections;
import java.util.Vector;
import java.util.stream.Collectors;
/**
* The class represent the type of each parameters and function return value.
*/
public class VariableType {
/**
* The base type of this variable removing all ending stars (remove all pointer
* levels) Each item in this a part of namespace and the last one must be the
* type itself (without any namespace restriction). If no namespace restriction
* for this type, this Vector will only have one item.
* <p>
* For end user, it is enough that knowing the last item is type itself.
*/
private Vector<String> mBaseType;
/**
* The pointer level of this type. It is equal to the count of trailing star of
* this field in C style representation.
*/
private int mPointerLevel;
/**
* Construct an empty varible type. This is commonly used constructor.
*/
public VariableType() {
mBaseType = new Vector<String>();
mPointerLevel = 0;
}
/**
* The constructor used for cloning self. This constructor is only can be used
* by self.
*
* @param base_type The hierarchy of the variable type.
* @param pointer_level The pointer level of new created variable type.
*/
private VariableType(Vector<String> base_type, int pointer_level) {
mBaseType = (Vector<String>) base_type.clone();
mPointerLevel = pointer_level;
}
/**
* Set this variable type with a type string in C/C++ style. For example
* "NSTest::NSTest2::MyType**".
*
* @param ctype The type string in C/C++ style.
*/
public void fromCType(String ctype) {
if (ctype.isEmpty())
throw new IllegalArgumentException("empty string can not be parsed.");
// get pointer part and name part
int len = ctype.length();
int star_pos = ctype.indexOf('*');
String namepart;
if (star_pos == -1) {
// no star
namepart = ctype;
mPointerLevel = 0;
} else {
// has star
if (star_pos == 0)
throw new IllegalArgumentException("base type not found.");
namepart = ctype.substring(0, star_pos);
mPointerLevel = len - star_pos;
}
// resolve name part
mBaseType.clear();
for (String item : namepart.split("::")) {
mBaseType.add(item);
}
}
/**
* Build a type string represented by this variable type in C/C++ style.
*
* @return The type string in C/C++ style.
*/
public String toCType() {
return mBaseType.stream().collect(Collectors.joining("::"))
+ String.join("", Collections.nCopies(mPointerLevel, "*"));
}
/**
* Get the base type of this variable type without any namespace. It just simply
* get the last entry in type hierarchy.
*
* @return The base type string without namespace prefix.
*/
public String getBaseType() {
return mBaseType.lastElement();
}
/**
* Check whether this variable type is a pointer. This function just check
* whether the pointer level of this variavle type is zero.
*
* @return True if it is pointer, otherwise false.
*/
public boolean isPointer() {
return mPointerLevel != 0;
}
/**
* Return the pointer level of this variable type. You can simply assume the
* pointer level is equal to the count of trailing star.
*
* @return The pointer level integer. Zero means that this type is not a
* pointer.
*/
public int getPointerLevel() {
return mPointerLevel;
}
/**
* Return the clone of the type hierarchy of this variable type.
* <p>
* It is rarely used. This only should be used when you need the namespace
* hierarchy of this variable type.
*
* @return The clone of current variable type hierarchy.
*/
public Vector<String> getBaseTypeHierarchy() {
return (Vector<String>) mBaseType.clone();
}
/**
* Check whether this type is a valid one. It actually check whether type
* hierarchy include at least one entry.
*
* @return True if no problem of this type, otherwise false.
*/
public boolean isValid() {
return mBaseType.size() != 0;
}
/**
* Return a new created variable type which is the pointer of this variable
* type.
* <p>
* In internal implementation, it just create a clone of current variable type
* with the increase of pointer level by 1.
*
* @return The new created pointer type of this variable type.
*/
public VariableType getPointerOfThis() {
return new VariableType(mBaseType, mPointerLevel + 1);
}
}