the cursor seek is pretty cleaned up and ready for an interactive API

This commit is contained in:
Allen Webster 2016-09-22 22:50:02 -04:00
parent e2bb11ad8d
commit 6a4e401a56
1 changed files with 92 additions and 118 deletions

View File

@ -388,137 +388,23 @@ buffer_get_line_index_from_wrapped_y(f32 *wraps, f32 y, f32 font_height, i32 l_b
return(result); return(result);
} }
typedef struct Seek_State{
Full_Cursor cursor;
Full_Cursor prev_cursor;
} Seek_State;
internal_4tech i32
cursor_seek_step(Seek_State *state, Buffer_Seek seek, i32 xy_seek, f32 max_width,
f32 font_height, f32 *adv, i32 size, u8 ch){
Full_Cursor cursor = state->cursor;
Full_Cursor prev_cursor = cursor;
i32 result = 1;
f32 x, px, y;
switch (ch){
case '\n':
++cursor.line;
cursor.unwrapped_y += font_height;
cursor.wrapped_y += font_height;
cursor.character = 1;
cursor.unwrapped_x = 0;
cursor.wrapped_x = 0;
break;
default:
{
f32 ch_width = adv[ch];
if (cursor.wrapped_x + ch_width > max_width){
cursor.wrapped_y += font_height;
cursor.wrapped_x = 0;
prev_cursor = cursor;
}
++cursor.character;
cursor.unwrapped_x += ch_width;
cursor.wrapped_x += ch_width;
}break;
}
++cursor.pos;
if (cursor.pos > size){
cursor = prev_cursor;
result = 0;
goto cursor_seek_step_end;
}
x = y = px = 0;
switch (seek.type){
case buffer_seek_pos:
if (cursor.pos > seek.pos){
cursor = prev_cursor;
result = 0;
goto cursor_seek_step_end;
}break;
case buffer_seek_wrapped_xy:
x = cursor.wrapped_x; px = prev_cursor.wrapped_x;
y = cursor.wrapped_y; break;
case buffer_seek_unwrapped_xy:
x = cursor.unwrapped_x; px = prev_cursor.unwrapped_x;
y = cursor.unwrapped_y; break;
case buffer_seek_line_char:
if (cursor.line == seek.line && cursor.character >= seek.character){
result = 0;
goto cursor_seek_step_end;
}
else if (cursor.line > seek.line){
cursor = prev_cursor;
result = 0;
goto cursor_seek_step_end;
}break;
}
if (xy_seek){
if (y > seek.y){
cursor = prev_cursor;
result = 0;
goto cursor_seek_step_end;
}
if (y > seek.y - font_height && x >= seek.x){
if (!seek.round_down){
if (ch != '\n' && (seek.x - px) < (x - seek.x)) cursor = prev_cursor;
result = 0;
goto cursor_seek_step_end;
}
if (x > seek.x){
cursor = prev_cursor;
result = 0;
goto cursor_seek_step_end;
}
}
}
cursor_seek_step_end:;
state->cursor = cursor;
state->prev_cursor = prev_cursor;
return(result);
}
internal_4tech Full_Cursor internal_4tech Full_Cursor
buffer_cursor_seek(Buffer_Type *buffer, Buffer_Seek seek, f32 max_width, buffer_cursor_seek(Buffer_Type *buffer, Buffer_Seek seek, f32 max_width,
f32 font_height, f32 *adv, Full_Cursor cursor){ f32 font_height, f32 *adv, Full_Cursor cursor){
i32 result = 0;
Seek_State state;
i32 xy_seek; i32 xy_seek;
state.cursor = cursor;
switch(seek.type){ switch(seek.type){
case buffer_seek_pos: case buffer_seek_pos:
if (cursor.pos >= seek.pos) goto buffer_cursor_seek_end; if (cursor.pos >= seek.pos) goto buffer_cursor_seek_end;
break;
case buffer_seek_wrapped_xy: case buffer_seek_wrapped_xy:
if (seek.x == 0 && cursor.wrapped_y >= seek.y) goto buffer_cursor_seek_end; if (seek.x == 0 && cursor.wrapped_y >= seek.y) goto buffer_cursor_seek_end;
break;
case buffer_seek_unwrapped_xy: case buffer_seek_unwrapped_xy:
if (seek.x == 0 && cursor.unwrapped_y >= seek.y) goto buffer_cursor_seek_end; if (seek.x == 0 && cursor.unwrapped_y >= seek.y) goto buffer_cursor_seek_end;
break;
case buffer_seek_line_char: case buffer_seek_line_char:
if (cursor.line >= seek.line && cursor.character >= seek.character) goto buffer_cursor_seek_end; if (cursor.line >= seek.line && cursor.character >= seek.character) goto buffer_cursor_seek_end;
break;
} }
if (adv){ if (adv){
@ -527,7 +413,7 @@ buffer_cursor_seek(Buffer_Type *buffer, Buffer_Seek seek, f32 max_width,
i32 i = cursor.pos; i32 i = cursor.pos;
xy_seek = (seek.type == buffer_seek_wrapped_xy || seek.type == buffer_seek_unwrapped_xy); xy_seek = (seek.type == buffer_seek_wrapped_xy || seek.type == buffer_seek_unwrapped_xy);
result = 1; i32 result = 1;
stream.use_termination_character = 1; stream.use_termination_character = 1;
stream.terminator = 0; stream.terminator = 0;
@ -537,8 +423,96 @@ buffer_cursor_seek(Buffer_Type *buffer, Buffer_Seek seek, f32 max_width,
do{ do{
for (; i < stream.end; ++i){ for (; i < stream.end; ++i){
u8 ch = (u8)stream.data[i]; u8 ch = (u8)stream.data[i];
result = cursor_seek_step(&state, seek, xy_seek, max_width,
font_height, adv, size, ch); Full_Cursor prev_cursor = cursor;
switch (ch){
case '\n':
++cursor.line;
cursor.unwrapped_y += font_height;
cursor.wrapped_y += font_height;
cursor.character = 1;
cursor.unwrapped_x = 0;
cursor.wrapped_x = 0;
break;
default:
{
f32 ch_width = adv[ch];
if (cursor.wrapped_x + ch_width > max_width){
cursor.wrapped_y += font_height;
cursor.wrapped_x = 0;
prev_cursor = cursor;
}
++cursor.character;
cursor.unwrapped_x += ch_width;
cursor.wrapped_x += ch_width;
}break;
}
++cursor.pos;
if (cursor.pos > size){
cursor = prev_cursor;
result = 0;
goto cursor_seek_step_end;
}
f32 x = 0, px = 0, y = 0;
switch (seek.type){
case buffer_seek_pos:
if (cursor.pos > seek.pos){
cursor = prev_cursor;
result = 0;
goto cursor_seek_step_end;
}break;
case buffer_seek_wrapped_xy:
x = cursor.wrapped_x; px = prev_cursor.wrapped_x;
y = cursor.wrapped_y; break;
case buffer_seek_unwrapped_xy:
x = cursor.unwrapped_x; px = prev_cursor.unwrapped_x;
y = cursor.unwrapped_y; break;
case buffer_seek_line_char:
if (cursor.line == seek.line && cursor.character >= seek.character){
result = 0;
goto cursor_seek_step_end;
}
else if (cursor.line > seek.line){
cursor = prev_cursor;
result = 0;
goto cursor_seek_step_end;
}break;
}
if (xy_seek){
if (y > seek.y){
cursor = prev_cursor;
result = 0;
goto cursor_seek_step_end;
}
if (y > seek.y - font_height && x >= seek.x){
if (!seek.round_down){
if (ch != '\n' && (seek.x - px) < (x - seek.x)) cursor = prev_cursor;
result = 0;
goto cursor_seek_step_end;
}
if (x > seek.x){
cursor = prev_cursor;
result = 0;
goto cursor_seek_step_end;
}
}
}
cursor_seek_step_end:;
if (!result){ if (!result){
goto buffer_cursor_seek_end; goto buffer_cursor_seek_end;
} }
@ -551,7 +525,7 @@ buffer_cursor_seek(Buffer_Type *buffer, Buffer_Seek seek, f32 max_width,
} }
buffer_cursor_seek_end:; buffer_cursor_seek_end:;
return(state.cursor); return(cursor);
} }
internal_4tech Partial_Cursor internal_4tech Partial_Cursor