/*===-- clang-c/Index.h - Indexing Public C Interface -------------*- C -*-===*\
|*                                                                            *|
|*                     The LLVM Compiler Infrastructure                       *|
|*                                                                            *|
|* This file is distributed under the University of Illinois Open Source      *|
|* License. See LICENSE.TXT for details.                                      *|
|*                                                                            *|
|*===----------------------------------------------------------------------===*|
|*                                                                            *|
|* This header provides a public inferface to a Clang library for extracting  *|
|* high-level symbol information from source files without exposing the full  *|
|* Clang C++ API.                                                             *|
|*                                                                            *|
\*===----------------------------------------------------------------------===*/

#ifndef CLANG_C_INDEX_H
#define CLANG_C_INDEX_H

#ifdef __cplusplus
extern "C" {
#endif

/*
   Clang indeX abstractions. The backing store for the following API's will be 
   clangs AST file (currently based on PCH). AST files are created as follows:
   
   "clang -emit-ast <sourcefile.langsuffix> -o <sourcefile.ast>". 
   
   Naming Conventions: To avoid namespace pollution, data types are prefixed 
   with "CX" and functions are prefixed with "clang_".
*/
typedef void *CXIndex;            /* An indexing instance. */

typedef void *CXTranslationUnit;  /* A translation unit instance. */

typedef void *CXDecl;    /* A specific declaration within a translation unit. */
typedef void *CXStmt;    /* A specific statement within a function/method */

/* Cursors represent declarations, definitions, and references. */
enum CXCursorKind {
 /* Declarations */
 CXCursor_FirstDecl                     = 1,
 CXCursor_TypedefDecl                   = 2,
 CXCursor_StructDecl                    = 3, 
 CXCursor_UnionDecl                     = 4,
 CXCursor_ClassDecl                     = 5,
 CXCursor_EnumDecl                      = 6,
 CXCursor_FieldDecl                     = 7,
 CXCursor_EnumConstantDecl              = 8,
 CXCursor_FunctionDecl                  = 9,
 CXCursor_VarDecl                       = 10,
 CXCursor_ParmDecl                      = 11,
 CXCursor_ObjCInterfaceDecl             = 12,
 CXCursor_ObjCCategoryDecl              = 13,
 CXCursor_ObjCProtocolDecl              = 14,
 CXCursor_ObjCPropertyDecl              = 15,
 CXCursor_ObjCIvarDecl                  = 16,
 CXCursor_ObjCInstanceMethodDecl        = 17,
 CXCursor_ObjCClassMethodDecl           = 18,
 CXCursor_LastDecl                      = 18,
 
 /* Definitions */
 CXCursor_FirstDefn                     = 32,
 CXCursor_FunctionDefn                  = 32,
 CXCursor_ObjCClassDefn                 = 33,
 CXCursor_ObjCCategoryDefn              = 34,
 CXCursor_ObjCInstanceMethodDefn        = 35,
 CXCursor_ObjCClassMethodDefn           = 36,
 CXCursor_LastDefn                      = 36,
   
 /* References */
 CXCursor_FirstRef                      = 40, /* Decl references */
 CXCursor_ObjCSuperClassRef             = 40,            
 CXCursor_ObjCProtocolRef               = 41,
 CXCursor_ObjCClassRef                  = 42,
 
 CXCursor_ObjCSelectorRef               = 43, /* Expression references */
 CXCursor_ObjCIvarRef                   = 44,
 CXCursor_VarRef                        = 45,
 CXCursor_FunctionRef                   = 46,
 CXCursor_EnumConstantRef               = 47,
 CXCursor_MemberRef                     = 48,
 CXCursor_LastRef                       = 48,
 
 /* Error conditions */
 CXCursor_FirstInvalid                  = 70,
 CXCursor_InvalidFile                   = 70,
 CXCursor_NoDeclFound                   = 71,
 CXCursor_NotImplemented                = 72,
 CXCursor_LastInvalid                   = 72
};

/* A cursor into the CXTranslationUnit. */

typedef struct {
  enum CXCursorKind kind;
  CXDecl decl;
  CXStmt stmt; /* expression reference */
} CXCursor;  

/* A unique token for looking up "visible" CXDecls from a CXTranslationUnit. */
typedef void *CXEntity;     

CXIndex clang_createIndex();
void clang_disposeIndex(CXIndex);

const char *clang_getTranslationUnitSpelling(CXTranslationUnit CTUnit);

CXTranslationUnit clang_createTranslationUnit(
  CXIndex, const char *ast_filename
);
CXTranslationUnit clang_createTranslationUnitFromSourceFile(
  CXIndex CIdx, 
  const char *source_filename,
  int num_clang_command_line_args, 
  const char **clang_command_line_args
);
void clang_disposeTranslationUnit(CXTranslationUnit);

/*
   Usage: clang_loadTranslationUnit(). Will load the toplevel declarations
   within a translation unit, issuing a 'callback' for each one.

   void printObjCInterfaceNames(CXTranslationUnit X, CXCursor C) {
     if (clang_getCursorKind(C) == Cursor_Declaration) {
       CXDecl D = clang_getCursorDecl(C);
       if (clang_getDeclKind(D) == CXDecl_ObjC_interface)
         printf("@interface %s in file %s on line %d column %d\n",
                clang_getDeclSpelling(D), clang_getCursorSource(C),
                clang_getCursorLine(C), clang_getCursorColumn(C));
     }
   }
   static void usage {
     clang_loadTranslationUnit(CXTranslationUnit, printObjCInterfaceNames);
   }
*/
typedef void *CXClientData;
typedef void (*CXTranslationUnitIterator)(CXTranslationUnit, CXCursor, 
                                          CXClientData);
void clang_loadTranslationUnit(CXTranslationUnit, CXTranslationUnitIterator,
                               CXClientData);

/*
   Usage: clang_loadDeclaration(). Will load the declaration, issuing a 
   'callback' for each declaration/reference within the respective declaration.
   
   For interface declarations, this will index the super class, protocols, 
   ivars, methods, etc. For structure declarations, this will index the fields.
   For functions, this will index the parameters (and body, for function 
   definitions), local declarations/references.

   void getInterfaceDetails(CXDecl X, CXCursor C) {
     switch (clang_getCursorKind(C)) {
       case Cursor_ObjC_ClassRef:
         CXDecl SuperClass = clang_getCursorDecl(C);
       case Cursor_ObjC_ProtocolRef:
         CXDecl AdoptsProtocol = clang_getCursorDecl(C);
       case Cursor_Declaration:
         CXDecl AnIvarOrMethod = clang_getCursorDecl(C);
     }
   }
   static void usage() {
     if (clang_getDeclKind(D) == CXDecl_ObjC_interface) {
       clang_loadDeclaration(D, getInterfaceDetails);
     }
   }
*/
typedef void (*CXDeclIterator)(CXDecl, CXCursor, CXClientData);

void clang_loadDeclaration(CXDecl, CXDeclIterator, CXClientData);

/*
 * CXEntity Operations.
 */
const char *clang_getDeclarationName(CXEntity);
const char *clang_getURI(CXEntity);
CXEntity clang_getEntity(const char *URI);
/*
 * CXDecl Operations.
 */
CXCursor clang_getCursorFromDecl(CXDecl);
CXEntity clang_getEntityFromDecl(CXDecl);
const char *clang_getDeclSpelling(CXDecl);
unsigned clang_getDeclLine(CXDecl);
unsigned clang_getDeclColumn(CXDecl);
const char *clang_getDeclSource(CXDecl);

/*
 * CXCursor Operations.
 */
CXCursor clang_getCursor(CXTranslationUnit, const char *source_name, 
                         unsigned line, unsigned column);

enum CXCursorKind clang_getCursorKind(CXCursor);
unsigned clang_isDeclaration(enum CXCursorKind);
unsigned clang_isReference(enum CXCursorKind);
unsigned clang_isDefinition(enum CXCursorKind);
unsigned clang_isInvalid(enum CXCursorKind);

unsigned clang_getCursorLine(CXCursor);
unsigned clang_getCursorColumn(CXCursor);
const char *clang_getCursorSource(CXCursor);
const char *clang_getCursorSpelling(CXCursor);

/* for debug/testing */
const char *clang_getCursorKindSpelling(enum CXCursorKind Kind); 
void clang_getDefinitionSpellingAndExtent(CXCursor, 
                                          const char **startBuf, 
                                          const char **endBuf,
                                          unsigned *startLine,
                                          unsigned *startColumn,
                                          unsigned *endLine,
                                          unsigned *endColumn);

/*
 * If CXCursorKind == Cursor_Reference, then this will return the referenced
 * declaration.
 * If CXCursorKind == Cursor_Declaration, then this will return the declaration.
 */
CXDecl clang_getCursorDecl(CXCursor);

#ifdef __cplusplus
}
#endif
#endif

