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clangcomplete.cpp
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clangcomplete.cpp
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#include <string>
#include <cstring>
#include <fstream>
#include <clang-c/Index.h>
extern "C" {
#include <lua.h>
#include <lauxlib.h>
#include <lualib.h>
}
int clangAutocomplete(lua_State* L, char *sourceFilePath, char *sourceBuffer, unsigned long sourceBufferLength,
int line, int column, char **args, size_t numArgs, const char *prefix);
int completeGetLuaArgs(lua_State* L, char* &sourceFilePath, char* &sourceBuffer, unsigned long &sourceBufferLength,
unsigned &offset, char** &args, size_t &numArgs);
void convertOffsetToLineAndColumn(char* sourceBuffer, unsigned offset, int &line, int &column);
// usage: complete(string SourceFilePath, int CurrentOffsetWithinFile, string SourceFileUnsavedBuffer, table compilerOptionsAsStrings)
int completeGetLuaArgs(lua_State* L, char* &sourceFilePath, char* &sourceBuffer, unsigned long &sourceBufferLength, unsigned &offset, char** &args, size_t &numArgs)
{
luaL_checktype(L, 1, LUA_TSTRING);
luaL_checktype(L, 2, LUA_TNUMBER);
luaL_checktype(L, 3, LUA_TSTRING);
luaL_checktype(L, 4, LUA_TTABLE);
// 4th param: list of compiler options, i.e. include paths, preprocessor definitions, etc.
{
numArgs = lua_objlen(L, 4);
args = new char*[numArgs];
size_t len = 0;
for(unsigned int i = 1; i <= numArgs; ++i) // lua params are indexed from 1
{
lua_rawgeti(L, 4, i);
const char *param = (char*)luaL_checklstring(L, -1, &len);
*(args + i - 1) = new char[len+1];
strncpy(*(args + i - 1), param, len);
(*(args + i - 1))[len] = 0;
lua_pop(L,1);
}
}
lua_pop(L,1);
//3rd param: buffer contents (unsaved contents of the source file)
{
size_t len;
const char *param = lua_tolstring(L, -1, &len);
sourceBufferLength = len;
sourceBuffer = new char[len+1];
strncpy(sourceBuffer, param, len);
sourceBuffer[len] = 0;
}
lua_pop(L,1);
//2nd param: offset in the file where the cursor is (i.e. where code completion takes place)
offset = lua_tointeger(L, -1);
lua_pop(L, 1);
// 1st param: source file path
{
size_t len;
const char *param = lua_tolstring(L, -1, &len);
sourceFilePath = new char[len+1];
strncpy(sourceFilePath, param, len);
sourceFilePath[len] = 0;
}
lua_pop(L,1);
if (offset>sourceBufferLength)
{
lua_pushstring(L, "complete: offset (param #2) is larger than the buffer (param #3)");
lua_error(L);
}
}
void convertOffsetToLineAndColumn(char* sourceBuffer, unsigned offset, int &line, int &column)
{
// convert the offset to row/column
line = column = 1;
for (char *pos=sourceBuffer, *bufferEnd=(sourceBuffer + offset); pos!=bufferEnd; ++pos) {
if (*pos == '\n')
{
++line;
column=1;
} else if (*pos != '\r') {
++column;
}
}
}
int do_complete(lua_State* L)
{
char *sourceFilePath=0, *sourceBuffer=0;
unsigned long sourceBufferLength=0;
int line=0, column=0;
unsigned offset=0;
char** args=0;
size_t numArgs=0;
completeGetLuaArgs(L, sourceFilePath, sourceBuffer, sourceBufferLength, offset, args, numArgs);
convertOffsetToLineAndColumn(sourceBuffer, offset, line, column);
return clangAutocomplete(L, sourceFilePath, sourceBuffer, sourceBufferLength, line, column, args, numArgs, NULL);
}
int clangAutocomplete(lua_State* L, char *sourceFilePath, char *sourceBuffer, unsigned long sourceBufferLength, int line, int column, char **args, size_t numArgs, const char *prefix)
{
// excludeDeclsFromPCH = 1, displayDiagnostics=1
CXIndex idx = clang_createIndex(1, 1);
CXUnsavedFile unsavedFile;
unsavedFile.Filename = sourceFilePath;
unsavedFile.Contents = sourceBuffer;
unsavedFile.Length = sourceBufferLength;
CXTranslationUnit tu = clang_parseTranslationUnit(
idx, // CXIndex
sourceFilePath,
args, // command_line_args,
numArgs,
&unsavedFile,
1, // num_unsaved_files,
CXTranslationUnit_None //~ or possibly: CXTranslationUnit_DetailedPreprocessingRecord | CXTranslationUnit_CacheCompletionResults | CXTranslationUnit_IncludeBriefCommentsInCodeCompletion
);
CXCodeCompleteResults *ccResults = clang_codeCompleteAt(
tu, // CXTranslationUnit
sourceFilePath,
line,
column,
&unsavedFile,
1, // num_unsaved_files,
clang_defaultCodeCompleteOptions()
);
if (!ccResults)
{
lua_pushstring(L, "complete: error - make sure all parameters have correct type");
lua_error(L);
}
// sort completion results in alphabetical order
clang_sortCodeCompletionResults(ccResults->Results, ccResults->NumResults);
// if filtering results to match prefix - calculate the size of the result table
int numResults = ccResults->NumResults;
if ((prefix != NULL) or (strlen(prefix) > 0))
{
numResults = 0;
int prefixLen = strlen(prefix);
CXCompletionResult* ccResult = ccResults->Results;
for (int i=0; i<ccResults->NumResults; ++i)
{
int numChunks = clang_getNumCompletionChunks (ccResult->CompletionString);
for (int chunkIdx=0; chunkIdx < numChunks; ++chunkIdx)
{
CXCompletionChunkKind kind = clang_getCompletionChunkKind (ccResult->CompletionString, chunkIdx);
if (kind == CXCompletionChunk_TypedText)
{
const char* completionString = (const char*)(clang_getCompletionChunkText (ccResult->CompletionString, chunkIdx).data);
bool matches = true;
for (int pos = 0; pos < prefixLen; ++pos)
{
if (*(completionString + pos) != *(prefix + pos))
{
matches = false;
break;
}
}
if (matches)
{
++numResults;
}
break;
}
}
++ccResult;
}
}
// create a lua table to hold the results
lua_createtable(L, numResults, 0);
int ccResultsTable = lua_gettop(L);
CXCompletionResult* ccResult = ccResults->Results;
int resultTableIdx = 0;
for (int i=0; i < ccResults->NumResults; ++i)
{
int numChunks = clang_getNumCompletionChunks (ccResult->CompletionString);
// check whether the result should be included (only if matches the existing prefix)
bool matches = true;
if (prefix != NULL)
{
int prefixLen = strlen(prefix);
for (int chunkIdx=0; chunkIdx < numChunks; ++chunkIdx)
{
CXCompletionChunkKind kind = clang_getCompletionChunkKind (ccResult->CompletionString, chunkIdx);
if (kind == CXCompletionChunk_TypedText)
{
const char* completionString = (const char*)(clang_getCompletionChunkText (ccResult->CompletionString, chunkIdx).data);
for (int pos = 0; pos < prefixLen; ++pos)
{
if (*(completionString + pos) != *(prefix + pos))
{
matches = false;
break;
}
}
break;
}
}
}
if (matches)
{
++resultTableIdx;
// create a table for chunks
lua_createtable(L, 1, 0);
int chunksTable = lua_gettop(L);
for (int chunkIdx=0; chunkIdx < numChunks; ++chunkIdx)
{
CXCompletionChunkKind kind = clang_getCompletionChunkKind (ccResult->CompletionString, chunkIdx);
lua_createtable(L, 1, 0);
int singleChunkTable = lua_gettop(L);
lua_pushinteger(L, (int)kind);
lua_rawseti(L, singleChunkTable, 1);
lua_pushstring(L, (const char*)(clang_getCompletionChunkText (ccResult->CompletionString, chunkIdx).data));
lua_rawseti(L, singleChunkTable, 2);
lua_rawseti(L, chunksTable, chunkIdx+1);
}
lua_rawseti(L, ccResultsTable, resultTableIdx);
}
++ccResult;
}
clang_disposeCodeCompleteResults(ccResults);
clang_disposeIndex(idx);
clang_disposeTranslationUnit(tu);
delete[] sourceFilePath;
delete[] sourceBuffer;
if (prefix != NULL) {
lua_pushstring(L, prefix); // return the prefix as a second value
return 2;
}
return 1;
}
int do_completeSymbol(lua_State *L)
{
char *sourceFilePath=0, *sourceBuffer=0;
unsigned long sourceBufferLength=0;
int line=0, column=0;
char** args=0;
unsigned offset=0;
size_t numArgs=0;
completeGetLuaArgs(L, sourceFilePath, sourceBuffer, sourceBufferLength, offset, args, numArgs);
// remove chars until the beginning of current token and store the prefix that has already been typed
unsigned newOffset = offset;
char *prefix = 0;
{
char *currentCharPtr = sourceBuffer + newOffset - 1;
char currentChar = 0;
while (true)
{
if (newOffset == 0) break;
currentChar = *currentCharPtr;
if (currentChar == '\n') break; // read only to the beginning of current line
if (!(((currentChar >= '0') && (currentChar <= '9')) || ((currentChar >= 'A') && (currentChar <= 'Z')) || ((currentChar >= 'a') && (currentChar <= 'z'))))
{
break;
}
--currentCharPtr;
--newOffset;
}
const int prefixLength = offset - newOffset;
prefix = new char[prefixLength + 1];
prefix[prefixLength] = 0;
for (int i = 0; i < prefixLength; ++i)
{
prefix[i] = *(++currentCharPtr);
*currentCharPtr = ' ';
}
}
convertOffsetToLineAndColumn(sourceBuffer, newOffset, line, column);
return clangAutocomplete(L, sourceFilePath, sourceBuffer, sourceBufferLength, line, column, args, numArgs, prefix);
}
static const struct luaL_reg api[] = {
{"complete",do_complete},
{"completeSymbol",do_completeSymbol}, // works within symbols
{NULL, NULL},
};
extern "C" __declspec(dllexport)
int luaopen_clangcomplete(lua_State *L)
{
luaL_openlib (L, "clangcomplete", api, 0);
return 1;
}