VuoTextEdit.h

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#pragma once
 
#include "VuoText.h"
 
#ifndef STB_TEXTEDIT_CHARTYPE
#define STB_TEXTEDIT_CHARTYPE uint64_t
#endif
 
#include <stdlib.h>
#include "VuoHeap.h"
#include "VuoImageText.h"
#include "stb_textedit.h"
#include "VuoClipboard.h"
#include "VuoModifierKey.h"
 
#define COMMAND_HI ((((uint64_t)VuoModifierKey_Command) << 32))                 
#define CONTROL_HI ((((uint64_t)VuoModifierKey_Control) << 32))                 
#define OPTION_HI ((((uint64_t)VuoModifierKey_Option) << 32))                   
#define SHIFT_HI ((((uint64_t)VuoModifierKey_Shift) << 32))                     
 
#define KEYCODE_COPY 0x3    
#define KEYCODE_PASTE 0x16  
#define KEYCODE_CUT 0x18    
#define KEYCODE_ESC 0x1b    
#define KEYCODE_TAB 0x9     
#define KEYCODE_RETURN 0xD  
 
static char STB_TEXTEDIT_NEWLINE = '\n';
 
#define STB_TEXTEDIT_K_LEFT            0x0001C                                     
#define STB_TEXTEDIT_K_RIGHT           0x0001D                                     
#define STB_TEXTEDIT_K_UP              0x0001E                                     
#define STB_TEXTEDIT_K_DOWN            0x0001F                                     
#define STB_TEXTEDIT_K_LINESTART       (COMMAND_HI | STB_TEXTEDIT_K_LEFT)          
#define STB_TEXTEDIT_K_LINEEND         (COMMAND_HI | STB_TEXTEDIT_K_RIGHT)         
#define STB_TEXTEDIT_K_TEXTSTART       (COMMAND_HI | STB_TEXTEDIT_K_UP)            
#define STB_TEXTEDIT_K_TEXTSTART2      (CONTROL_HI | 0x41)                         
#define STB_TEXTEDIT_K_TEXTEND         (COMMAND_HI | STB_TEXTEDIT_K_DOWN)          
#define STB_TEXTEDIT_K_TEXTEND2        (CONTROL_HI | 0x45)                         
#define STB_TEXTEDIT_K_DELETE          0x7f                                        
#define STB_TEXTEDIT_K_BACKSPACE       0x00008                                     
#define STB_TEXTEDIT_K_UNDO            (COMMAND_HI | 0x1A)                         
#define STB_TEXTEDIT_K_REDO            (COMMAND_HI | 0x19)                         
#define STB_TEXTEDIT_K_REDO2           ((COMMAND_HI | SHIFT_HI) | 0x1A)            
#define STB_TEXTEDIT_K_WORDLEFT        (OPTION_HI | STB_TEXTEDIT_K_LEFT)           
#define STB_TEXTEDIT_K_WORDRIGHT       (OPTION_HI | STB_TEXTEDIT_K_RIGHT)          
#define STB_TEXTEDIT_K_DELETEWORD      (OPTION_HI | STB_TEXTEDIT_K_BACKSPACE)      
#define STB_TEXTEDIT_K_DELETEWORDRIGHT (OPTION_HI | STB_TEXTEDIT_K_DELETE)         
#define STB_TEXTEDIT_K_DELETELINE      (COMMAND_HI | STB_TEXTEDIT_K_BACKSPACE)     
#define STB_TEXTEDIT_K_DELETELINERIGHT (COMMAND_HI | STB_TEXTEDIT_K_DELETE)        
#define STB_TEXTEDIT_K_SHIFT           SHIFT_HI                                    
#define STB_TEXTEDIT_K_SELECTALL       (COMMAND_HI | 0x1)                          
 
#define STB_TEXTEDIT_GETWIDTH_NEWLINE 0
 
typedef VuoText STB_TEXTEDIT_STRING;
 
static STB_TEXTEDIT_CHARTYPE VuoTextEdit_combineKeyAndModifier(uint32_t utf32, VuoModifierKey modifiers)
{
    return ((uint64_t)utf32) | (((uint64_t)modifiers) << 32);
}
 
static STB_TEXTEDIT_CHARTYPE* VuoTextEdit_makeCharArrayWithVuoText(VuoText text, size_t* length)
{
    uint32_t* utf32 = VuoText_getUtf32Values(text, length);
    STB_TEXTEDIT_CHARTYPE* stbchars = (STB_TEXTEDIT_CHARTYPE*) malloc(sizeof(STB_TEXTEDIT_CHARTYPE) * (*length));
    for(int i = 0; i < (*length); i++)
        stbchars[i] = utf32[i];
    free(utf32);
    return stbchars;
}
 
static int STB_TEXTEDIT_STRINGLEN(const STB_TEXTEDIT_STRING* obj)
{
    return VuoText_length(*obj);
}
 
static bool VuoTextEdit_isNewLine(uint32_t utf32_char)
{
    return  utf32_char >= 0xA && utf32_char <= 0xD;
}
 
static bool VuoTextEdit_isWhiteSpace(uint32_t utf32_char)
{
    // control code or one of those weird white space chars between 0x2000-A
    if( utf32_char < 33 || (utf32_char >= 0x2000 && utf32_char <= 0x200A) )
        return true;
 
    return false;
}
 
static bool VuoTextEdit_isSeparator(uint32_t utf32_char)
{
    // control code or one of those weird white space chars between 0x2000-A
    if( VuoTextEdit_isWhiteSpace(utf32_char) )
        return true;
 
    size_t length = 0;
 
    uint32_t* separators = VuoText_getUtf32Values("./\\()\"'-:,;<>~!@#$%%^&*|+=[]{}`~?", &length);
 
    for(size_t i = 0; i < length; i++)
    {
        if(utf32_char == separators[i])
        {
            free(separators);
            return true;
        }
    }
 
    free(separators);
 
    return false;
}
 
static void stb_textedit_prep_selection_at_cursor(STB_TexteditState *state);
 
static void VuoTextEdit_selectFromCursorToSeparator(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, bool (*separatorFunc)(uint32_t))
{
    if(VuoText_isEmpty(*str))
        return;
 
    stb_textedit_prep_selection_at_cursor(state);
 
    size_t len = 0;
    uint32_t* chars = VuoText_getUtf32Values(*str, &len);
    // select_start can be greater if placeholder text is present
    int start = MIN(len, state->select_start);
    state->select_start = 0;
 
    for(int i = start; i > 0; i--)
    {
        if( (*separatorFunc)(chars[i]) )
        {
            state->select_start = i + 1;
            break;
        }
    }
 
    int prev_end = state->select_end;
    state->select_end = len;
    state->cursor = len;
 
    for(int i = prev_end; i < len; i++)
    {
        if( (*separatorFunc)(chars[i]) )
        {
            state->select_end = i;
            state->cursor = i;
            break;
        }
    }
}
 
static void VuoTextEdit_copy(STB_TEXTEDIT_STRING *str, STB_TexteditState *state)
{
    int start = MIN(state->select_start, state->select_end);
    int end = MAX(state->select_start, state->select_end);
    VuoText selection = VuoText_substring(*str, start + 1, end - start);
    VuoLocal(selection);
    VuoClipboard_setText(selection);
}
 
static int stb_textedit_cut(STB_TEXTEDIT_STRING *str, STB_TexteditState *state);
 
static int VuoTextEdit_cut(STB_TEXTEDIT_STRING *str, STB_TexteditState *state)
{
    if( state->select_start != state->select_end )
    {
        VuoTextEdit_copy(str, state);
        stb_textedit_cut(str, state);
        return 1;
    }
    return 0;
}
 
static int stb_textedit_paste(STB_TEXTEDIT_STRING *str, STB_TexteditState *state, STB_TEXTEDIT_CHARTYPE const *ctext, int len);
 
static STB_TEXTEDIT_CHARTYPE STB_TEXTEDIT_GETCHAR(const STB_TEXTEDIT_STRING* obj, int idx)
{
    if(idx < 0)
        return -1;
 
    // @todo It's inefficient to keep allocating a full utf32 array for a single char
    size_t length;
 
    uint32_t* utf32 = VuoText_getUtf32Values(*obj, &length);
 
    if(idx >= length)
        return -1;
 
    return (STB_TEXTEDIT_CHARTYPE) utf32[idx];
}
 
static int stb_textedit_linecount(STB_TEXTEDIT_STRING* str)
{
    int count = 1;
 
    for(int ii = 0; ii < STB_TEXTEDIT_STRINGLEN(str); ii++)
        if( STB_TEXTEDIT_GETCHAR(str, ii) == STB_TEXTEDIT_NEWLINE)
            count++;
 
    return count;
}
 
static VuoText VuoTextEdit_truncateLines(VuoText text, VuoInteger maxLines)
{
    VuoList_VuoInteger newLines = VuoText_findOccurrences(text, "\n");
    VuoLocal(newLines);
 
    VuoText res;
 
    if(VuoListGetCount_VuoInteger(newLines) >= maxLines)
    {
        VuoInteger trunc = VuoListGetValue_VuoInteger(newLines, maxLines);
        // Subtract 1 because we don't want the \n
        res = VuoText_substring(text, 1, trunc - 1);
    }
    else
    {
        res = VuoText_make(text);
    }
 
    return res;
}
 
static void VuoTextEdit_paste(STB_TEXTEDIT_STRING *str, STB_TexteditState *state)
{
    VuoText clipboard = VuoClipboard_getContents();
    VuoLocal(clipboard);
 
    int lineCount = stb_textedit_linecount(str);
    // +1 because line_count is a count of \n, not lines.
    VuoText res = VuoTextEdit_truncateLines(clipboard, (state->line_count - lineCount) + 1);
    VuoLocal(res);
 
    size_t len = 0;
    uint64_t* clip64 = VuoTextEdit_makeCharArrayWithVuoText(res, &len);
    stb_textedit_paste(str, state, clip64, len);
    free(clip64);
}
 
static int stb_text_locate_coord(STB_TexteditState *state, float x, float y)
{
    return VuoImageTextData_getNearestCharToPoint((VuoImageTextData) state->textImageData, VuoPoint2d_make(x, y));
}
 
static void stb_textedit_find_charpos(StbFindState* find, STB_TEXTEDIT_STRING *str, int n, STB_TexteditState* state)
{
    VuoImageTextData data = (VuoImageTextData)state->textImageData;
 
    unsigned int lineIndex = 0;
    VuoPoint2d position = VuoImageTextData_getPositionForCharIndex(data, n, &lineIndex);
 
    find->x = position.x;
    find->y = position.y;
    find->height = data->lineHeight;
    find->first_char = VuoImageTextData_getCharIndexForLine(data, lineIndex);
    find->length = data->lineCounts[lineIndex];
    find->prev_first = VuoImageTextData_getCharIndexForLine(data, MAX(0, ((int)lineIndex) - 1));
}
 
static int VuoTextEdit_findLineIndex(int charIndex, STB_TexteditState* state)
{
    VuoImageTextData data = (VuoImageTextData) state->textImageData;
    unsigned int lineIndex = 0;
    VuoImageTextData_getPositionForCharIndex(data, charIndex, &lineIndex);
    return VuoImageTextData_getCharIndexForLine(data, lineIndex);
}
 
static uint32_t STB_TEXTEDIT_KEYTOTEXT(STB_TEXTEDIT_CHARTYPE key)
{
    // fprintf(stderr, "raw: %llu (%llu) hi: %llu  lo: %u\n", key, (OPTION_HI | 0xd), key & VuoModifierKey_Any, (uint32_t) ((key & ~VuoModifierKey_Any) & 0xFFFF));
 
    // special case - alt+enter inserts new line, alt+tab inserts tab
    if(key == (OPTION_HI | KEYCODE_RETURN))
        return STB_TEXTEDIT_NEWLINE;
    else if(key == (OPTION_HI | KEYCODE_TAB))
        return '\t';
 
    uint32_t lo = (uint32_t) (key & 0xFFFF);
 
    return lo > 31 && lo < UINT32_MAX ? lo : 0;
}
 
#define STB_TEXTEDIT_IS_SPACE(x) VuoTextEdit_isSeparator(((uint32_t)x))
 
#define STB_TEXTEDIT_IS_SEPARATOR(x) VuoTextEdit_isSeparator(((uint32_t)x))
 
static float STB_TEXTEDIT_GETWIDTH(STB_TEXTEDIT_STRING* obj, int n, int i, STB_TexteditState* state)
{
    VuoImageTextData data = (VuoImageTextData) state->textImageData;
    return data->charAdvance[n + i];
}
 
static void STB_TEXTEDIT_LAYOUTROW(StbTexteditRow* r, STB_TEXTEDIT_STRING* obj, int line_start_idx, STB_TexteditState* state)
{
    unsigned int len = 1;
    VuoRectangle rect = VuoImageTextData_layoutRowAtIndex((VuoImageTextData) state->textImageData, line_start_idx, &len);
    r->x0 = rect.center.x - (rect.size.x * .5);
    r->x1 = rect.size.x;
    r->baseline_y_delta = rect.size.y;
    r->ymin = rect.center.y - (rect.size.y * .5f);
    r->ymax = rect.size.y;
    r->num_chars = len;
}
 
static void STB_TEXTEDIT_DELETECHARS(STB_TEXTEDIT_STRING* obj, int pos, int n)
{
    VuoText old = *obj;
    *obj = VuoText_removeAt(old, pos + 1, n);
    VuoRetain(*obj);
    VuoRelease(old);
}
 
static bool STB_TEXTEDIT_INSERTCHARS(STB_TEXTEDIT_STRING* obj, int pos, const STB_TEXTEDIT_CHARTYPE* new_text, int new_text_len)
{
    uint32_t new_text_32[new_text_len];
 
    for(int i = 0; i < new_text_len; i++)
        new_text_32[i] = (uint32_t) (new_text[i] & 0xFFFF);
 
    VuoText old = *obj;
    VuoText ascii = VuoText_makeFromUtf32(new_text_32, new_text_len);
    VuoLocal(ascii);
    *obj = VuoText_insert(old, pos + 1, ascii);
    VuoRelease(old);
    VuoRetain(*obj);
    return true;
}