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4coder/4coder_auto_indent.cpp

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/*
4coder_auto_indent.cpp - Commands for auto-indentation of C++ code.
*/
// TOP
static Hard_Start_Result
buffer_find_hard_start(Application_Links *app, Buffer_Summary *buffer, i32 line_start, i32 tab_width){
i32 tab_additional_width = tab_width - 1;
Hard_Start_Result result = {};
result.all_space = true;
result.indent_pos = 0;
result.char_pos = line_start;
char data_chunk[1024];
Stream_Chunk stream = {};
stream.add_null = true;
if (init_stream_chunk(&stream, app, buffer, line_start, data_chunk, sizeof(data_chunk))){
b32 still_looping = true;
do{
for (; result.char_pos < stream.end; ++result.char_pos){
char c = stream.data[result.char_pos];
if (c == '\n' || c == 0){
result.all_whitespace = 1;
goto double_break;
}
if (c >= '!' && c <= '~'){
goto double_break;
}
if (c == '\t'){
result.indent_pos += tab_additional_width;
}
if (c != ' '){
result.all_space = false;
}
result.indent_pos += 1;
}
still_looping = forward_stream_chunk(&stream);
}while(still_looping);
}
double_break:;
return(result);
}
static Buffer_Batch_Edit
make_batch_from_indent_marks(Application_Links *app, Partition *arena, Buffer_Summary *buffer,
i32 first_line, i32 one_past_last_line, i32 *indent_marks,
Indent_Options opts){
i32 *shifted_indent_marks = indent_marks - first_line;
i32 edit_count = 0;
i32 edit_max = one_past_last_line - first_line;
Buffer_Edit *edits = push_array(arena, Buffer_Edit, edit_max);
char *str_base = push_array(arena, char, 0);
for (i32 line_number = first_line;
line_number < one_past_last_line;
++line_number){
i32 line_start_pos = buffer_get_line_start(app, buffer, line_number);
Hard_Start_Result hard_start = buffer_find_hard_start(app, buffer, line_start_pos, opts.tab_width);
i32 correct_indentation = shifted_indent_marks[line_number];
if (hard_start.all_whitespace && opts.empty_blank_lines){
correct_indentation = 0;
}
if (correct_indentation == -1){
correct_indentation = hard_start.indent_pos;
}
if (correct_indentation != hard_start.indent_pos){
i32 str_size = correct_indentation;
if (opts.use_tabs){
str_size = correct_indentation/opts.tab_width + correct_indentation%opts.tab_width;
}
char *str = push_array(arena, char, str_size);
if (opts.use_tabs){
i32 indent = 0;
i32 j = 0;
for (;indent + opts.tab_width <= correct_indentation;
indent += opts.tab_width){
str[j++] = '\t';
}
for (;indent < correct_indentation;
indent += 1){
str[j++] = ' ';
}
}
else{
for (i32 j = 0; j < correct_indentation;){
str[j++] = ' ';
}
}
Buffer_Edit new_edit;
new_edit.str_start = (i32)(str - str_base);
new_edit.len = str_size;
new_edit.start = line_start_pos;
new_edit.end = hard_start.char_pos;
edits[edit_count++] = new_edit;
}
Assert(edit_count <= edit_max);
}
Buffer_Batch_Edit result = {};
result.str = str_base;
result.str_len = (i32)(push_array(arena, char, 0) - str_base);
result.edits = edits;
result.edit_count = edit_count;
return(result);
}
static void
set_line_indents(Application_Links *app, Partition *part, Buffer_Summary *buffer,
i32 first_line, i32 one_past_last_line,
i32 *indent_marks, Indent_Options opts){
Buffer_Batch_Edit batch = make_batch_from_indent_marks(app, part, buffer,
first_line, one_past_last_line,
indent_marks, opts);
if (batch.edit_count > 0){
buffer_batch_edit(app, buffer, batch.str, batch.str_len, batch.edits, batch.edit_count,
BatchEdit_PreserveTokens);
}
}
static Cpp_Token*
seek_matching_token_backwards(Cpp_Token_Array tokens, Cpp_Token *token,
Cpp_Token_Type open_type, Cpp_Token_Type close_type){
if (token <= tokens.tokens){
token = tokens.tokens;
}
else{
i32 nesting_level = 0;
for (; token > tokens.tokens; --token){
if (!(token->flags & CPP_TFLAG_PP_BODY)){
if (token->type == close_type){
++nesting_level;
}
else if (token->type == open_type){
if (nesting_level == 0){
break;
}
else{
--nesting_level;
}
}
}
}
}
return(token);
}
static Indent_Anchor_Position
find_anchor_token(Application_Links *app, Buffer_Summary *buffer, Cpp_Token_Array tokens,
i32 line_start, i32 tab_width){
// NOTE(allen): New implementation of find_anchor_token (4.0.26) revert if it is a problem.
Indent_Anchor_Position anchor = {};
if (tokens.count > 0){
Cpp_Token *first_invalid_token = get_first_token_at_line(app, buffer, tokens, line_start);
if (first_invalid_token <= tokens.tokens){
anchor.token = tokens.tokens;
}
else{
i32 stack[256];
i32 top = -1;
Cpp_Token *token_it = tokens.tokens;
i32 highest_checked_line_number = -1;
for (; token_it < first_invalid_token; ++token_it){
i32 line_number = buffer_get_line_number(app, buffer, token_it->start);
if (highest_checked_line_number < line_number){
highest_checked_line_number = line_number;
if (top == -1){
anchor.token = token_it;
}
}
switch (token_it->type){
case CPP_TOKEN_BRACE_OPEN:
case CPP_TOKEN_BRACKET_OPEN:
case CPP_TOKEN_PARENTHESE_OPEN:
{
top += 1;
stack[top] = token_it->type;
}break;
case CPP_TOKEN_PARENTHESE_CLOSE:
{
for (;top >= 0;){
i32 index = top;
top -= 1;
if (stack[index] == CPP_TOKEN_PARENTHESE_OPEN){
break;
}
}
}break;
case CPP_TOKEN_BRACE_CLOSE:
{
for (;top >= 0;){
i32 index = top;
if (stack[index] == CPP_TOKEN_PARENTHESE_OPEN){
break;
}
top -= 1;
if (stack[index] == CPP_TOKEN_BRACE_OPEN){
break;
}
}
}break;
case CPP_TOKEN_BRACKET_CLOSE:
{
for (;top >= 0;){
i32 index = top;
if (stack[index] == CPP_TOKEN_PARENTHESE_OPEN ||
stack[index] == CPP_TOKEN_BRACE_OPEN){
break;
}
top -= 1;
if (stack[index] == CPP_TOKEN_BRACKET_OPEN){
break;
}
}
}break;
}
}
}
}
return(anchor);
}
static i32*
get_indentation_marks(Application_Links *app, Partition *arena, Buffer_Summary *buffer,
Cpp_Token_Array tokens, i32 first_line, i32 one_past_last_line,
b32 exact_align, i32 tab_width){
i32 indent_mark_count = one_past_last_line - first_line;
i32 *indent_marks = push_array(arena, i32, indent_mark_count);
// Shift the array so line_index works correctly.
indent_marks -= first_line;
// Decide where to start indentation parsing.
Indent_Anchor_Position anchor = find_anchor_token(app, buffer, tokens, first_line, tab_width);
Cpp_Token *token_ptr = anchor.token;
Indent_Parse_State indent = {};
indent.current_indent = anchor.indentation;
if (token_ptr == 0){
for (i32 line_index = first_line; line_index < one_past_last_line; ++line_index){
indent_marks[line_index] = 0;
}
}
else{
i32 line_number = buffer_get_line_number(app, buffer, token_ptr->start);
if (line_number > first_line){
line_number = first_line;
}
if (token_ptr == tokens.tokens){
indent.current_indent = 0;
}
i32 next_line_start_pos = buffer_get_line_start(app, buffer, line_number);
indent.previous_line_indent = indent.current_indent;
Cpp_Token prev_token = {};
Cpp_Token token = {};
if (token_ptr < tokens.tokens + tokens.count){
token = *token_ptr;
}
// Back up and consume this token too IF it is a scope opener.
if (token.type == CPP_TOKEN_BRACE_OPEN || token.type == CPP_TOKEN_BRACKET_OPEN){
--token_ptr;
}
// LOOP OVER TOKENS
for (;;){
if (line_number >= one_past_last_line){
break;
}
prev_token = token;
++token_ptr;
if (token_ptr < tokens.tokens + tokens.count){
token = *token_ptr;
}
else{
token.type = CPP_TOKEN_EOF;
token.start = buffer->size;
token.flags = 0;
}
for (;token.start >= next_line_start_pos && line_number < one_past_last_line;){
next_line_start_pos = buffer_get_line_start(app, buffer, line_number + 1);
i32 this_indent = 0;
i32 previous_indent = indent.previous_line_indent;
i32 this_line_start = buffer_get_line_start(app, buffer, line_number);
i32 next_line_start = next_line_start_pos;
b32 did_multi_line_behavior = false;
// NOTE(allen): Check for multi-line tokens
if (prev_token.start <= this_line_start && prev_token.start + prev_token.size > this_line_start){
if (prev_token.type == CPP_TOKEN_COMMENT || prev_token.type == CPP_TOKEN_STRING_CONSTANT){
Hard_Start_Result hard_start = buffer_find_hard_start(app, buffer, this_line_start, tab_width);
if (exact_align){
this_indent = indent.previous_comment_indent;
}
else{
if (hard_start.all_whitespace){
this_indent = previous_indent;
}
else{
i32 line_pos = hard_start.char_pos - this_line_start;
this_indent = line_pos + indent.comment_shift;
if (this_indent < 0){
this_indent = 0;
}
}
}
if (!hard_start.all_whitespace){
if (line_number >= first_line){
indent.previous_comment_indent = this_indent;
}
else{
indent.previous_comment_indent = hard_start.indent_pos;
}
}
did_multi_line_behavior = true;
}
}
if (!did_multi_line_behavior){
this_indent = indent.current_indent;
if (token.start < next_line_start){
if (token.flags & CPP_TFLAG_PP_DIRECTIVE){
this_indent = 0;
}
else{
switch (token.type){
case CPP_TOKEN_BRACKET_CLOSE:
{
this_indent -= tab_width;
}break;
case CPP_TOKEN_BRACE_CLOSE:
{
this_indent -= tab_width;
}break;
case CPP_TOKEN_BRACE_OPEN:
{}break;
default:
if (indent.current_indent > 0){
b32 statement_complete = false;
Cpp_Token *prev_usable_token_ptr = token_ptr - 1;
Cpp_Token prev_usable_token = {};
if (prev_usable_token_ptr >= tokens.tokens){
prev_usable_token = *prev_usable_token_ptr;
}
// Scan backwards for the previous token that actually tells us about the statement.
b32 has_prev_usable_token = true;
#define NotUsable(T) \
(((T).flags&CPP_TFLAG_PP_BODY) || ((T).flags&CPP_TFLAG_PP_DIRECTIVE) || ((T).type == CPP_TOKEN_COMMENT))
if (NotUsable(prev_usable_token)){
has_prev_usable_token = false;
for (--prev_usable_token_ptr;
prev_usable_token_ptr >= tokens.tokens;
--prev_usable_token_ptr){
prev_usable_token = *prev_usable_token_ptr;
if (!NotUsable(prev_usable_token)){
has_prev_usable_token = true;
break;
}
}
}
#undef NotUsable
if (!has_prev_usable_token){
statement_complete = true;
}
else{
if (prev_usable_token.type == CPP_TOKEN_BRACKET_OPEN ||
prev_usable_token.type == CPP_TOKEN_BRACE_OPEN ||
prev_usable_token.type == CPP_TOKEN_BRACE_CLOSE ||
prev_usable_token.type == CPP_TOKEN_SEMICOLON ||
prev_usable_token.type == CPP_TOKEN_COLON ||
prev_usable_token.type == CPP_TOKEN_COMMA){
statement_complete = true;
}
}
if (!statement_complete){
this_indent += tab_width;
}
}
}
}
}
if (this_indent < 0){
this_indent = 0;
}
}
if (indent.paren_nesting > 0){
if (prev_token.type != CPP_TOKEN_PARENTHESE_OPEN){
i32 level = indent.paren_nesting - 1;
if (level >= ArrayCount(indent.paren_anchor_indent)){
level = ArrayCount(indent.paren_anchor_indent) - 1;
}
this_indent = indent.paren_anchor_indent[level];
}
}
// Rebase the paren anchor if the first token
// after the open paren is on the next line.
if (indent.paren_nesting > 0){
if (prev_token.type == CPP_TOKEN_PARENTHESE_OPEN){
i32 level = indent.paren_nesting - 1;
if (level >= ArrayCount(indent.paren_anchor_indent)){
level = ArrayCount(indent.paren_anchor_indent) - 1;
}
indent.paren_anchor_indent[level] = this_indent;
}
}
if (line_number >= first_line){
indent_marks[line_number] = this_indent;
}
++line_number;
indent.previous_line_indent = this_indent;
}
// Update indent state.
switch (token.type){
case CPP_TOKEN_BRACKET_OPEN: indent.current_indent += tab_width; break;
case CPP_TOKEN_BRACKET_CLOSE: indent.current_indent -= tab_width; break;
case CPP_TOKEN_BRACE_OPEN: indent.current_indent += tab_width; break;
case CPP_TOKEN_BRACE_CLOSE: indent.current_indent -= tab_width; break;
case CPP_TOKEN_COMMENT:
case CPP_TOKEN_STRING_CONSTANT:
{
i32 line = buffer_get_line_number(app, buffer, token.start);
i32 start = buffer_get_line_start(app, buffer, line);
Hard_Start_Result hard_start = buffer_find_hard_start(app, buffer, start, tab_width);
i32 old_dist_to_token = (token.start - start);
i32 old_indent = hard_start.indent_pos;
i32 token_start_inset = old_dist_to_token - old_indent;
i32 new_dist_to_token = indent.current_indent + token_start_inset;
indent.comment_shift = (new_dist_to_token - old_dist_to_token);
indent.previous_comment_indent = old_indent;
}break;
case CPP_TOKEN_PARENTHESE_OPEN:
{
if (!(token.flags & CPP_TFLAG_PP_BODY)){
if (indent.paren_nesting < ArrayCount(indent.paren_anchor_indent)){
i32 line = buffer_get_line_number(app, buffer, token.start);
i32 start = buffer_get_line_start(app, buffer, line);
i32 char_pos = token.start - start;
Hard_Start_Result hard_start = buffer_find_hard_start(app, buffer, start, tab_width);
i32 line_pos = hard_start.char_pos - start;
indent.paren_anchor_indent[indent.paren_nesting] = char_pos - line_pos + indent.previous_line_indent + 1;
}
++indent.paren_nesting;
}
}break;
case CPP_TOKEN_PARENTHESE_CLOSE:
{
if (!(token.flags & CPP_TFLAG_PP_BODY)){
if (indent.paren_nesting > 0){
--indent.paren_nesting;
}
}
}break;
}
}
}
// Unshift the indent_marks array.
indent_marks += first_line;
return(indent_marks);
}
static void
get_indent_lines_minimum(Application_Links *app, Buffer_Summary *buffer, i32 start_pos, i32 end_pos, i32 *line_start_out, i32 *line_end_out){
i32 line_start = buffer_get_line_number(app, buffer, start_pos);
i32 line_end = buffer_get_line_number(app, buffer, end_pos) + 1;
*line_start_out = line_start;
*line_end_out = line_end;
}
static void
get_indent_lines_whole_tokens(Application_Links *app, Buffer_Summary *buffer, Cpp_Token_Array tokens, i32 start_pos, i32 end_pos, i32 *line_start_out, i32 *line_end_out){
i32 line_start = buffer_get_line_number(app, buffer, start_pos);
i32 line_end = buffer_get_line_number(app, buffer, end_pos);
for (;line_start > 1;){
i32 line_start_pos = 0;
Cpp_Token *token = get_first_token_at_line(app, buffer, tokens, line_start, &line_start_pos);
if (token && token->start < line_start_pos){
line_start = buffer_get_line_number(app, buffer, token->start);
}
else{
break;
}
}
for (;line_end < buffer->line_count;){
i32 next_line_start_pos = 0;
Cpp_Token *token = get_first_token_at_line(app, buffer, tokens, line_end+1, &next_line_start_pos);
if (token && token->start < next_line_start_pos){
line_end = buffer_get_line_number(app, buffer, token->start+token->size);
}
else{
break;
}
}
if (line_end > buffer->line_count){
line_end = buffer->line_count + 1;
}
else{
line_end += 1;
}
*line_start_out = line_start;
*line_end_out = line_end;
}
static b32
buffer_auto_indent(Application_Links *app, Partition *part, Buffer_Summary *buffer, i32 start, i32 end, i32 tab_width, Auto_Indent_Flag flags){
b32 result = false;
if (buffer->exists && buffer->tokens_are_ready){
result = true;
Temp_Memory temp = begin_temp_memory(part);
// Stage 1: Read the tokens to be used for indentation.
Cpp_Token_Array tokens;
tokens.count = buffer_token_count(app, buffer);
tokens.max_count = tokens.count;
tokens.tokens = push_array(part, Cpp_Token, tokens.count);
buffer_read_tokens(app, buffer, 0, tokens.count, tokens.tokens);
// Stage 2: Decide where the first and last lines are.
// The lines in the range [line_start,line_end) will be indented.
i32 line_start = 0, line_end = 0;
if (flags & AutoIndent_FullTokens){
get_indent_lines_whole_tokens(app, buffer, tokens, start, end, &line_start, &line_end);
}
else{
get_indent_lines_minimum(app, buffer, start, end, &line_start, &line_end);
}
// Stage 3: Decide Indent Amounts
// Get an array representing how much each line in
// the range [line_start,line_end) should be indented.
i32 *indent_marks = get_indentation_marks(app, part, buffer, tokens, line_start, line_end, (flags & AutoIndent_ExactAlignBlock), tab_width);
// Stage 4: Set the Line Indents
Indent_Options opts = {};
opts.empty_blank_lines = (flags & AutoIndent_ClearLine);
opts.use_tabs = (flags & AutoIndent_UseTab);
opts.tab_width = tab_width;
set_line_indents(app, part, buffer, line_start, line_end, indent_marks, opts);
end_temp_memory(temp);
}
return(result);
}
static b32
buffer_auto_indent(Application_Links *app, Buffer_Summary *buffer, i32 start, i32 end, i32 tab_width, Auto_Indent_Flag flags){
return(buffer_auto_indent(app, &global_part, buffer, start, end, tab_width, flags));
}
//
// Commands
//
#if !defined(DEFAULT_INDENT_FLAGS)
# define DEFAULT_INDENT_FLAGS ((global_config.indent_with_tabs)?(AutoIndent_UseTab):(0))
#endif
#if !defined(DEF_TAB_WIDTH)
# define DEF_TAB_WIDTH global_config.indent_width
#endif
CUSTOM_COMMAND_SIG(auto_tab_whole_file)
CUSTOM_DOC("Audo-indents the entire current buffer.")
{
u32 access = AccessOpen;
View_Summary view = get_active_view(app, access);
Buffer_Summary buffer = get_buffer(app, view.buffer_id, access);
buffer_auto_indent(app, &global_part, &buffer, 0, buffer.size, DEF_TAB_WIDTH, DEFAULT_INDENT_FLAGS | AutoIndent_FullTokens);
}
CUSTOM_COMMAND_SIG(auto_tab_line_at_cursor)
CUSTOM_DOC("Auto-indents the line on which the cursor sits.")
{
u32 access = AccessOpen;
View_Summary view = get_active_view(app, access);
Buffer_Summary buffer = get_buffer(app, view.buffer_id, access);
buffer_auto_indent(app, &global_part, &buffer, view.cursor.pos, view.cursor.pos, DEF_TAB_WIDTH, DEFAULT_INDENT_FLAGS | AutoIndent_FullTokens);
move_past_lead_whitespace(app, &view, &buffer);
}
CUSTOM_COMMAND_SIG(auto_tab_range)
CUSTOM_DOC("Auto-indents the range between the cursor and the mark.")
{
u32 access = AccessOpen;
View_Summary view = get_active_view(app, access);
Buffer_Summary buffer = get_buffer(app, view.buffer_id, access);
Range range = get_view_range(&view);
buffer_auto_indent(app, &global_part, &buffer, range.min, range.max, DEF_TAB_WIDTH, DEFAULT_INDENT_FLAGS | AutoIndent_FullTokens);
move_past_lead_whitespace(app, &view, &buffer);
}
CUSTOM_COMMAND_SIG(write_and_auto_tab)
CUSTOM_DOC("Inserts a character and auto-indents the line on which the cursor sits.")
{
exec_command(app, write_character);
u32 access = AccessOpen;
View_Summary view = get_active_view(app, access);
Buffer_Summary buffer = get_buffer(app, view.buffer_id, access);
u32 flags = DEFAULT_INDENT_FLAGS;
User_Input in = get_command_input(app);
if (in.key.character == '\n'){
flags |= AutoIndent_ExactAlignBlock;
}
buffer_auto_indent(app, &global_part, &buffer, view.cursor.pos, view.cursor.pos, DEF_TAB_WIDTH, flags);
move_past_lead_whitespace(app, &view, &buffer);
}
// BOTTOM
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