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4coder/4coder_function_list.cpp

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/*
4coder_function_list.cpp - Command for listing all functions in a C/C++ file in a jump list.
*/
// TOP
// NOTE(allen|a4.0.14): This turned out to be a nasty little routine. There might
// be a better way to do it with just tokens that I didn't see the first time
// through. Once I build a real parser this should become almost just as easy as
// iterating tokens is now.
//
static Get_Positions_Results
get_function_positions(Application_Links *app, Buffer_ID buffer, i32 first_token_index, Function_Positions *positions_array, i32 positions_max){
Get_Positions_Results result = {};
Token_Range token_range = buffer_get_token_range(app, buffer);
if (token_range.first != 0){
Token_Iterator token_it = make_token_iterator(token_range, first_token_index);
i32 nest_level = 0;
i32 paren_nest_level = 0;
Cpp_Token *first_paren = 0;
i32 first_paren_index = 0;
i32 first_paren_position = 0;
i32 last_paren_index = 0;
// Look for the next token at global scope that might need to be printed.
mode1:
Assert(nest_level == 0);
Assert(paren_nest_level == 0);
first_paren_index = 0;
first_paren_position = 0;
last_paren_index = 0;
for (Cpp_Token *token = token_iterator_current(&token_it);
token != 0;
token = token_iterator_goto_next(&token_it)){
if (!(token->flags & CPP_TFLAG_PP_BODY)){
switch (token->type){
case CPP_TOKEN_BRACE_OPEN:
{
++nest_level;
}break;
case CPP_TOKEN_BRACE_CLOSE:
{
if (nest_level > 0){
--nest_level;
}
}break;
case CPP_TOKEN_PARENTHESE_OPEN:
{
if (nest_level == 0){
first_paren = token;
first_paren_index = token_iterator_current_index(&token_it);
first_paren_position = token->start;
goto paren_mode1;
}
}break;
}
}
}
goto end;
// Look for a closing parenthese to mark the end of a function signature.
paren_mode1:
paren_nest_level = 0;
for (Cpp_Token *token = token_iterator_current(&token_it);
token != 0;
token = token_iterator_goto_next(&token_it)){
if (!(token->flags & CPP_TFLAG_PP_BODY)){
switch (token->type){
case CPP_TOKEN_PARENTHESE_OPEN:
{
++paren_nest_level;
}break;
case CPP_TOKEN_PARENTHESE_CLOSE:
{
--paren_nest_level;
if (paren_nest_level == 0){
last_paren_index = token_iterator_current_index(&token_it);
goto paren_mode2;
}
}break;
}
}
}
goto end;
// Look backwards from an open parenthese to find the start of a function signature.
paren_mode2:
{
Cpp_Token *restore_point = token_iterator_current(&token_it);
token_iterator_set(&token_it, first_paren);
i32 signature_start_index = 0;
for (Cpp_Token *token = token_iterator_current(&token_it);
token != 0;
token = token_iterator_goto_prev(&token_it)){
if ((token->flags & CPP_TFLAG_PP_BODY) || (token->flags & CPP_TFLAG_PP_DIRECTIVE) ||
token->type == CPP_TOKEN_BRACE_CLOSE || token->type == CPP_TOKEN_SEMICOLON || token->type == CPP_TOKEN_PARENTHESE_CLOSE){
token_iterator_goto_next(&token_it);
signature_start_index = token_iterator_current_index(&token_it);
if (signature_start_index == -1){
signature_start_index = first_paren_index;
}
goto paren_mode2_done;
}
}
// When this loop ends by going all the way back to the beginning set the
// signature start to 0 and fall through to the printing phase.
signature_start_index = 0;
paren_mode2_done:;
{
Function_Positions positions;
positions.sig_start_index = signature_start_index;
positions.sig_end_index = last_paren_index;
positions.open_paren_pos = first_paren_position;
positions_array[result.positions_count++] = positions;
}
token_iterator_set(&token_it, restore_point);
if (result.positions_count >= positions_max){
result.next_token_index = token_iterator_current_index(&token_it);
result.still_looping = true;
goto end;
}
goto mode1;
}
end:;
}
return(result);
}
static void
print_positions_buffered(Application_Links *app, Buffer_Insertion *out, Function_Positions *positions_array, i32 positions_count){
Arena *scratch = context_get_arena(app);
Temp_Memory temp = begin_temp(scratch);
Buffer_ID buffer = out->buffer;
String_Const_u8 buffer_name = buffer_push_unique_buffer_name(app, buffer, scratch);
for (i32 i = 0; i < positions_count; ++i){
Function_Positions *positions = &positions_array[i];
i32 start_index = positions->sig_start_index;
i32 end_index = positions->sig_end_index;
i32 open_paren_pos = positions->open_paren_pos;
i32 line_number = buffer_get_line_number(app, buffer, open_paren_pos);
Assert(end_index > start_index);
Token_Range token_range = buffer_get_token_range(app, buffer);
if (token_range.first != 0){
insertf(out, "%.*s:%d: ", string_expand(buffer_name), line_number);
Cpp_Token prev_token = {};
Token_Iterator token_it = make_token_iterator(token_range, start_index);
for (Cpp_Token *token = token_iterator_current(&token_it);
token != 0 && token_iterator_current_index(&token_it) <= end_index;
token = token_iterator_goto_next_raw(&token_it)){
if ((token->flags & CPP_TFLAG_PP_BODY) == 0 && token->type != CPP_TOKEN_COMMENT){
if ((prev_token.type == CPP_TOKEN_IDENTIFIER ||
prev_token.type == CPP_TOKEN_STAR ||
prev_token.type == CPP_TOKEN_COMMA ||
(prev_token.flags & CPP_TFLAG_IS_KEYWORD) != 0
) &&
!(token->type == CPP_TOKEN_PARENTHESE_OPEN ||
token->type == CPP_TOKEN_PARENTHESE_CLOSE ||
token->type == CPP_TOKEN_COMMA
)
){
insertc(out, ' ');
}
Temp_Memory token_temp = begin_temp(scratch);
String_Const_u8 lexeme = get_token_lexeme(app, scratch, buffer, *token);
insert_string(out, lexeme);
end_temp(token_temp);
prev_token = *token;
}
}
insertc(out, '\n');
}
}
end_temp(temp);
}
static void
list_all_functions(Application_Links *app, Buffer_ID optional_target_buffer){
// TODO(allen): Use create or switch to buffer and clear here?
String_Const_u8 decls_name = string_u8_litexpr("*decls*");
Buffer_ID decls_buffer = 0;
get_buffer_by_name(app, decls_name, AccessAll, &decls_buffer);
if (!buffer_exists(app, decls_buffer)){
create_buffer(app, decls_name, BufferCreate_AlwaysNew, &decls_buffer);
buffer_set_setting(app, decls_buffer, BufferSetting_Unimportant, true);
buffer_set_setting(app, decls_buffer, BufferSetting_ReadOnly, true);
buffer_set_setting(app, decls_buffer, BufferSetting_WrapLine, false);
}
else{
buffer_send_end_signal(app, decls_buffer);
i32 size = 0;
buffer_get_size(app, decls_buffer, &size);
buffer_replace_range(app, decls_buffer, make_range(0, size), string_u8_litexpr(""));
}
Arena *scratch = context_get_arena(app);
Temp_Memory temp = begin_temp(scratch);
// TODO(allen): rewrite get_function_positions to allocate on arena
i32 positions_max = (4<<10)/sizeof(Function_Positions);
Function_Positions *positions_array = push_array(scratch, Function_Positions, positions_max);
Cursor insertion_cursor = make_cursor(push_array(scratch, u8, KB(256)), KB(256));
Buffer_Insertion out = begin_buffer_insertion_at_buffered(app, decls_buffer, 0, &insertion_cursor);
Buffer_ID buffer_it = 0;
for (get_buffer_next(app, 0, AccessAll, &buffer_it);
buffer_it != 0;
get_buffer_next(app, buffer_it, AccessAll, &buffer_it)){
Buffer_ID buffer = buffer_it;
if (optional_target_buffer != 0){
buffer = optional_target_buffer;
}
if (buffer_tokens_are_ready(app, buffer)){
i32 token_index = 0;
b32 still_looping = false;
do{
Get_Positions_Results get_positions_results = get_function_positions(app, buffer, token_index, positions_array, positions_max);
i32 positions_count = get_positions_results.positions_count;
token_index = get_positions_results.next_token_index;
still_looping = get_positions_results.still_looping;
print_positions_buffered(app, &out, positions_array, positions_count);
}while(still_looping);
if (optional_target_buffer != 0){
break;
}
}
else{
continue;
}
}
end_buffer_insertion(&out);
View_ID view = 0;
get_active_view(app, AccessAll, &view);
view_set_buffer(app, view, decls_buffer, 0);
lock_jump_buffer(decls_name);
end_temp(temp);
}
CUSTOM_COMMAND_SIG(list_all_functions_current_buffer)
CUSTOM_DOC("Creates a jump list of lines of the current buffer that appear to define or declare functions.")
{
View_ID view = 0;
get_active_view(app, AccessProtected, &view);
Buffer_ID buffer = 0;
view_get_buffer(app, view, AccessProtected, &buffer);
if (buffer_exists(app, buffer)){
list_all_functions(app, buffer);
}
}
CUSTOM_COMMAND_SIG(list_all_functions_current_buffer_lister)
CUSTOM_DOC("Creates a lister of locations that look like function definitions and declarations in the buffer.")
{
View_ID view = 0;
get_active_view(app, AccessProtected, &view);
Buffer_ID buffer = 0;
view_get_buffer(app, view, AccessProtected, &buffer);
if (buffer_exists(app, buffer)){
list_all_functions(app, buffer);
get_active_view(app, AccessAll, &view);
open_jump_lister(app, &global_heap, view, buffer, JumpListerActivation_OpenInUIView, 0);
}
}
CUSTOM_COMMAND_SIG(list_all_functions_all_buffers)
CUSTOM_DOC("Creates a jump list of lines from all buffers that appear to define or declare functions.")
{
list_all_functions(app, 0);
}
CUSTOM_COMMAND_SIG(list_all_functions_all_buffers_lister)
CUSTOM_DOC("Creates a lister of locations that look like function definitions and declarations all buffers.")
{
list_all_functions(app, 0);
View_ID view = 0;
get_active_view(app, AccessAll, &view);
Buffer_ID buffer = 0;
view_get_buffer(app, view, AccessAll, &buffer);
open_jump_lister(app, &global_heap, view, buffer, JumpListerActivation_OpenInUIView, 0);
}
// BOTTOM
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