4coder/custom/4coder_scope_commands.cpp

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/*
4coder_scope_commands.cpp - A set of commands and helpers relevant for scope level navigation and editing.
*/
// TOP
function Nest_Delimiter_Kind
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get_nest_delimiter_kind(Token_Base_Kind kind, Find_Nest_Flag flags){
Nest_Delimiter_Kind result = NestDelim_None;
switch (kind){
case TokenBaseKind_ScopeOpen:
{
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if (HasFlag(flags, FindNest_Scope)){
result = NestDelim_Open;
}
}break;
case TokenBaseKind_ScopeClose:
{
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if (HasFlag(flags, FindNest_Scope)){
result = NestDelim_Close;
}
}break;
case TokenBaseKind_ParentheticalOpen:
{
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if (HasFlag(flags, FindNest_Paren)){
result = NestDelim_Open;
}
}break;
case TokenBaseKind_ParentheticalClose:
{
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if (HasFlag(flags, FindNest_Paren)){
result = NestDelim_Close;
}
}break;
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}
return(result);
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}
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function b32
find_nest_side(Application_Links *app, Buffer_ID buffer, i64 pos,
Find_Nest_Flag flags, Scan_Direction scan, Nest_Delimiter_Kind delim,
Range_i64 *out){
b32 result = false;
b32 balanced = HasFlag(flags, FindNest_Balanced);
if (balanced){
if ((delim == NestDelim_Open && scan == Scan_Forward) ||
(delim == NestDelim_Close && scan == Scan_Backward)){
balanced = false;
}
}
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Managed_Scope scope = buffer_get_managed_scope(app, buffer);
Token_Array *tokens = scope_attachment(app, scope, attachment_tokens, Token_Array);
if (tokens != 0 && tokens->count > 0){
Token_Iterator_Array it = token_iterator_pos(0, tokens, pos);
i32 level = 0;
for (;;){
Token *token = token_it_read(&it);
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Nest_Delimiter_Kind token_delim = get_nest_delimiter_kind(token->kind, flags);
if (level == 0 && token_delim == delim){
*out = Ii64_size(token->pos, token->size);
result = true;
break;
}
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if (balanced && token_delim != NestDelim_None){
level += (token_delim == delim)?-1:1;
}
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b32 good = false;
if (scan == Scan_Forward){
good = token_it_inc(&it);
}
else{
good = token_it_dec(&it);
}
if (!good){
break;
}
}
}
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return(result);
}
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function b32
find_nest_side(Application_Links *app, Buffer_ID buffer, i64 pos,
Find_Nest_Flag flags, Scan_Direction scan, Nest_Delimiter_Kind delim,
i64 *out){
Range_i64 range = {};
b32 result = find_nest_side(app, buffer, pos, flags, scan, delim, &range);
if (result){
if (HasFlag(flags, FindNest_EndOfToken)){
*out = range.end;
}
else{
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*out = range.start;
}
}
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return(result);
}
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function b32
find_surrounding_nest(Application_Links *app, Buffer_ID buffer, i64 pos,
Find_Nest_Flag flags, Range_i64 *out){
b32 result = false;
Range_i64 range = {};
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if (find_nest_side(app, buffer, pos - 1, flags|FindNest_Balanced,
Scan_Backward, NestDelim_Open, &range.start) &&
find_nest_side(app, buffer, pos, flags|FindNest_Balanced|FindNest_EndOfToken,
Scan_Forward, NestDelim_Close, &range.end)){
*out = range;
result = true;
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}
return(result);
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}
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function void
select_scope(Application_Links *app, View_ID view, Range_i64 range){
view_set_cursor_and_preferred_x(app, view, seek_pos(range.first));
view_set_mark(app, view, seek_pos(range.end));
view_look_at_region(app, view, range.first, range.end);
no_mark_snap_to_cursor(app, view);
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}
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CUSTOM_COMMAND_SIG(select_surrounding_scope)
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CUSTOM_DOC("Finds the scope enclosed by '{' '}' surrounding the cursor and puts the cursor and mark on the '{' and '}'.")
{
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View_ID view = get_active_view(app, AccessProtected);
Buffer_ID buffer = view_get_buffer(app, view, AccessProtected);
i64 pos = view_get_cursor_pos(app, view);
Range_i64 range = {};
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if (find_surrounding_nest(app, buffer, pos, FindNest_Scope, &range)){
select_scope(app, view, range);
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}
}
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CUSTOM_COMMAND_SIG(select_next_scope_absolute)
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CUSTOM_DOC("Finds the first scope started by '{' after the cursor and puts the cursor and mark on the '{' and '}'.")
{
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View_ID view = get_active_view(app, AccessProtected);
Buffer_ID buffer = view_get_buffer(app, view, AccessProtected);
i64 pos = view_get_cursor_pos(app, view);
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Find_Nest_Flag flags = FindNest_Scope;
Range_i64 range = {};
if (find_nest_side(app, buffer, pos + 1,
flags, Scan_Forward, NestDelim_Open, &range) &&
find_nest_side(app, buffer, range.end,
flags|FindNest_Balanced|FindNest_EndOfToken, Scan_Forward,
NestDelim_Close, &range.end)){
select_scope(app, view, range);
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}
}
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CUSTOM_COMMAND_SIG(select_prev_scope_absolute)
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CUSTOM_DOC("Finds the first scope started by '{' before the cursor and puts the cursor and mark on the '{' and '}'.")
{
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View_ID view = get_active_view(app, AccessProtected);
Buffer_ID buffer = view_get_buffer(app, view, AccessProtected);
i64 pos = view_get_cursor_pos(app, view);
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Find_Nest_Flag flags = FindNest_Scope;
Range_i64 range = {};
if (find_nest_side(app, buffer, pos - 1,
flags, Scan_Backward, NestDelim_Open, &range) &&
find_nest_side(app, buffer, range.end,
flags|FindNest_Balanced|FindNest_EndOfToken, Scan_Forward,
NestDelim_Close, &range.end)){
select_scope(app, view, range);
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}
}
CUSTOM_COMMAND_SIG(place_in_scope)
CUSTOM_DOC("Wraps the code contained in the range between cursor and mark with a new curly brace scope.")
{
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place_begin_and_end_on_own_lines(app, "{", "}");
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}
CUSTOM_COMMAND_SIG(delete_current_scope)
CUSTOM_DOC("Deletes the braces surrounding the currently selected scope. Leaves the contents within the scope.")
{
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View_ID view = get_active_view(app, AccessOpen);
Buffer_ID buffer = view_get_buffer(app, view, AccessOpen);
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Range_i64 range = get_view_range(app, view);
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if (buffer_get_char(app, buffer, range.min) == '{' &&
buffer_get_char(app, buffer, range.max - 1) == '}'){
i32 top_len = 1;
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i32 bot_len = 1;
if (buffer_get_char(app, buffer, range.min - 1) == '\n'){
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top_len = 2;
}
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if (buffer_get_char(app, buffer, range.max + 1) == '\n'){
bot_len = 2;
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}
Batch_Edit batch_first = {};
Batch_Edit batch_last = {};
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batch_first.edit.text = SCu8();
batch_first.edit.range = Ii64(range.min + 1 - top_len, range.min + 1);
batch_first.next = &batch_last;
batch_last.edit.text = SCu8();
batch_last.edit.range = Ii64((i32)(range.max - 1), (i32)(range.max - 1 + bot_len));
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buffer_batch_edit(app, buffer, &batch_first);
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}
}
// BOTTOM