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OctaCore/src/engine/textedit.hh

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struct editline
{
enum { CHUNKSIZE = 256 };
char *text;
int len, maxlen;
editline() : text(NULL), len(0), maxlen(0) {}
editline(const char *init) : text(NULL), len(0), maxlen(0)
{
set(init);
}
bool empty() { return len <= 0; }
void clear()
{
DELETEA(text);
len = maxlen = 0;
}
bool grow(int total, const char *fmt = "", ...)
{
if(total + 1 <= maxlen) return false;
maxlen = (total + CHUNKSIZE) - total%CHUNKSIZE;
char *newtext = new char[maxlen];
if(fmt)
{
va_list args;
va_start(args, fmt);
vformatstring(newtext, fmt, args, maxlen);
va_end(args);
}
else newtext[0] = '\0';
DELETEA(text);
text = newtext;
return true;
}
void set(const char *str, int slen = -1)
{
if(slen < 0)
{
slen = strlen(str);
if(!grow(slen, "%s", str)) memcpy(text, str, slen + 1);
}
else
{
grow(slen);
memcpy(text, str, slen);
text[slen] = '\0';
}
len = slen;
}
void prepend(const char *str)
{
int slen = strlen(str);
if(!grow(slen + len, "%s%s", str, text ? text : ""))
{
memmove(&text[slen], text, len + 1);
memcpy(text, str, slen + 1);
}
len += slen;
}
void append(const char *str)
{
int slen = strlen(str);
if(!grow(len + slen, "%s%s", text ? text : "", str)) memcpy(&text[len], str, slen + 1);
len += slen;
}
bool read(stream *f, int chop = -1)
{
if(chop < 0) chop = INT_MAX; else chop++;
set("");
while(len + 1 < chop && f->getline(&text[len], min(maxlen, chop) - len))
{
len += strlen(&text[len]);
if(len > 0 && text[len-1] == '\n')
{
text[--len] = '\0';
return true;
}
if(len + 1 >= maxlen && len + 1 < chop) grow(len + CHUNKSIZE, "%s", text);
}
if(len + 1 >= chop)
{
char buf[CHUNKSIZE];
while(f->getline(buf, sizeof(buf)))
{
int blen = strlen(buf);
if(blen > 0 && buf[blen-1] == '\n') return true;
}
}
return len > 0;
}
void del(int start, int count)
{
if(!text) return;
if(start < 0) { count += start; start = 0; }
if(count <= 0 || start >= len) return;
if(start + count > len) count = len - start - 1;
memmove(&text[start], &text[start+count], len + 1 - (start + count));
len -= count;
}
void chop(int newlen)
{
if(!text) return;
len = clamp(newlen, 0, len);
text[len] = '\0';
}
void insert(char *str, int start, int count = 0)
{
if(count <= 0) count = strlen(str);
start = clamp(start, 0, len);
grow(len + count, "%s", text ? text : "");
memmove(&text[start + count], &text[start], len - start + 1);
memcpy(&text[start], str, count);
len += count;
}
void combinelines(vector<editline> &src)
{
if(src.empty()) set("");
else loopv(src)
{
if(i) append("\n");
if(!i) set(src[i].text, src[i].len);
else insert(src[i].text, len, src[i].len);
}
}
};
enum { EDITORFOCUSED = 1, EDITORUSED, EDITORFOREVER };
struct editor
{
int mode; //editor mode - 1= keep while focused, 2= keep while used in gui, 3= keep forever (i.e. until mode changes)
bool active, rendered;
const char *name;
const char *filename;
int cx, cy; // cursor position - ensured to be valid after a region() or currentline()
int mx, my; // selection mark, mx=-1 if following cursor - avoid direct access, instead use region()
int maxx, maxy; // maxy=-1 if unlimited lines, 1 if single line editor
int scrolly; // vertical scroll offset
bool linewrap;
int pixelwidth; // required for up/down/hit/draw/bounds
int pixelheight; // -1 for variable sized, i.e. from bounds()
vector<editline> lines; // MUST always contain at least one line!
editor(const char *name, int mode, const char *initval) :
mode(mode), active(true), rendered(false), name(newstring(name)), filename(NULL),
cx(0), cy(0), mx(-1), maxx(-1), maxy(-1), scrolly(0), linewrap(false), pixelwidth(-1), pixelheight(-1)
{
//printf("editor %08x '%s'\n", this, name);
lines.add().set(initval ? initval : "");
}
~editor()
{
//printf("~editor %08x '%s'\n", this, name);
DELETEA(name);
DELETEA(filename);
clear(NULL);
}
bool empty() { return lines.length() == 1 && lines[0].empty(); }
void clear(const char *init = "")
{
cx = cy = 0;
mark(false);
loopv(lines) lines[i].clear();
lines.shrink(0);
if(init) lines.add().set(init);
}
void init(const char *inittext)
{
if(strcmp(lines[0].text, inittext)) clear(inittext);
}
void updateheight()
{
int width;
text_bounds(lines[0].text, width, pixelheight, pixelwidth);
}
void setfile(const char *fname)
{
DELETEA(filename);
if(fname) filename = newstring(fname);
}
void load()
{
if(!filename) return;
clear(NULL);
stream *file = openutf8file(filename, "r");
if(file)
{
while(lines.add().read(file, maxx) && (maxy < 0 || lines.length() <= maxy));
lines.pop().clear();
delete file;
}
if(lines.empty()) lines.add().set("");
}
void save()
{
if(!filename) return;
stream *file = openutf8file(filename, "w");
if(!file) return;
loopv(lines) file->putline(lines[i].text);
delete file;
}
void mark(bool enable)
{
mx = (enable) ? cx : -1;
my = cy;
}
void selectall()
{
mx = my = INT_MAX;
cx = cy = 0;
}
// constrain results to within buffer - s=start, e=end, return true if a selection range
// also ensures that cy is always within lines[] and cx is valid
bool region(int &sx, int &sy, int &ex, int &ey)
{
int n = lines.length();
ASSERT(n != 0);
if(cy < 0) cy = 0; else if(cy >= n) cy = n-1;
int len = lines[cy].len;
if(cx < 0) cx = 0; else if(cx > len) cx = len;
if(mx >= 0)
{
if(my < 0) my = 0; else if(my >= n) my = n-1;
len = lines[my].len;
if(mx > len) mx = len;
sx = mx; sy = my;
}
else { sx = cx; sy = cy; }
ex = cx;
ey = cy;
if(sy > ey) { swap(sy, ey); swap(sx, ex); }
else if(sy==ey && sx > ex) swap(sx, ex);
if(mx >= 0) ex++;
return (sx != ex) || (sy != ey);
}
bool region() { int sx, sy, ex, ey; return region(sx, sy, ex, ey); }
// also ensures that cy is always within lines[] and cx is valid
editline &currentline()
{
int n = lines.length();
ASSERT(n != 0);
if(cy < 0) cy = 0; else if(cy >= n) cy = n-1;
if(cx < 0) cx = 0; else if(cx > lines[cy].len) cx = lines[cy].len;
return lines[cy];
}
void copyselectionto(editor *b)
{
if(b==this) return;
b->clear(NULL);
int sx, sy, ex, ey;
region(sx, sy, ex, ey);
loopi(1+ey-sy)
{
if(b->maxy != -1 && b->lines.length() >= b->maxy) break;
int y = sy+i;
char *line = lines[y].text;
int len = lines[y].len;
if(y == sy && y == ey)
{
line += sx;
len = ex - sx;
}
else if(y == sy) line += sx;
else if(y == ey) len = ex;
b->lines.add().set(line, len);
}
if(b->lines.empty()) b->lines.add().set("");
}
char *tostring()
{
int len = 0;
loopv(lines) len += lines[i].len + 1;
char *str = newstring(len);
int offset = 0;
loopv(lines)
{
editline &l = lines[i];
memcpy(&str[offset], l.text, l.len);
offset += l.len;
str[offset++] = '\n';
}
str[offset] = '\0';
return str;
}
char *selectiontostring()
{
vector<char> buf;
int sx, sy, ex, ey;
region(sx, sy, ex, ey);
loopi(1+ey-sy)
{
int y = sy+i;
char *line = lines[y].text;
int len = lines[y].len;
if(y == sy && y == ey)
{
line += sx;
len = ex - sx;
}
else if(y == sy) line += sx;
else if(y == ey) len = ex;
buf.put(line, len);
buf.add('\n');
}
buf.add('\0');
return newstring(buf.getbuf(), buf.length()-1);
}
void removelines(int start, int count)
{
loopi(count) lines[start+i].clear();
lines.remove(start, count);
}
bool del() // removes the current selection (if any)
{
int sx, sy, ex, ey;
if(!region(sx, sy, ex, ey))
{
mark(false);
return false;
}
if(sy == ey)
{
if(sx == 0 && ex == lines[ey].len) removelines(sy, 1);
else lines[sy].del(sx, ex - sx);
}
else
{
if(ey > sy+1) { removelines(sy+1, ey-(sy+1)); ey = sy+1; }
if(ex == lines[ey].len) removelines(ey, 1); else lines[ey].del(0, ex);
if(sx == 0) removelines(sy, 1); else lines[sy].del(sx, lines[sy].len - sx);
}
if(lines.empty()) lines.add().set("");
mark(false);
cx = sx;
cy = sy;
editline &current = currentline();
if(cx >= current.len && cy < lines.length() - 1)
{
current.append(lines[cy+1].text);
removelines(cy + 1, 1);
}
return true;
}
void insert(char ch)
{
del();
editline &current = currentline();
if(ch == '\n')
{
if(maxy == -1 || cy < maxy-1)
{
editline newline(&current.text[cx]);
current.chop(cx);
cy = min(lines.length(), cy+1);
lines.insert(cy, newline);
}
else current.chop(cx);
cx = 0;
}
else
{
int len = current.len;
if(maxx >= 0 && len > maxx-1) len = maxx-1;
if(cx <= len) current.insert(&ch, cx++, 1);
}
}
void insert(const char *s)
{
while(*s) insert(*s++);
}
void insertallfrom(editor *b)
{
if(b==this) return;
del();
if(b->lines.length() == 1 || maxy == 1)
{
editline &current = currentline();
char *str = b->lines[0].text;
int slen = b->lines[0].len;
if(maxx >= 0 && b->lines[0].len + cx > maxx) slen = maxx-cx;
if(slen > 0)
{
int len = current.len;
if(maxx >= 0 && slen + cx + len > maxx) len = max(0, maxx-(cx+slen));
current.insert(str, cx, slen);
cx += slen;
}
}
else
{
loopv(b->lines)
{
if(!i)
{
lines[cy++].append(b->lines[i].text);
}
else if(i >= b->lines.length())
{
cx = b->lines[i].len;
lines[cy].prepend(b->lines[i].text);
}
else if(maxy < 0 || lines.length() < maxy) lines.insert(cy++, editline(b->lines[i].text));
}
}
}
void scrollup()
{
cy--;
}
void scrolldown()
{
cy++;
}
void key(int code)
{
switch(code)
{
case SDLK_UP:
if(linewrap)
{
int x, y;
char *str = currentline().text;
text_pos(str, cx+1, x, y, pixelwidth);
if(y > 0) { cx = text_visible(str, x, y-FONTH, pixelwidth); break; }
}
cy--;
break;
case SDLK_DOWN:
if(linewrap)
{
int x, y, width, height;
char *str = currentline().text;
text_pos(str, cx, x, y, pixelwidth);
text_bounds(str, width, height, pixelwidth);
y += FONTH;
if(y < height) { cx = text_visible(str, x, y, pixelwidth); break; }
}
cy++;
break;
case SDLK_PAGEUP:
cy-=pixelheight/FONTH;
break;
case SDLK_PAGEDOWN:
cy+=pixelheight/FONTH;
break;
case SDLK_HOME:
cx = cy = 0;
break;
case SDLK_END:
cx = cy = INT_MAX;
break;
case SDLK_LEFT:
cx--;
break;
case SDLK_RIGHT:
cx++;
break;
case SDLK_DELETE:
if(!del())
{
editline &current = currentline();
if(cx < current.len) current.del(cx, 1);
else if(cy < lines.length()-1)
{ //combine with next line
current.append(lines[cy+1].text);
removelines(cy+1, 1);
}
}
break;
case SDLK_BACKSPACE:
if(!del())
{
editline &current = currentline();
if(cx > 0) current.del(--cx, 1);
else if(cy > 0)
{ //combine with previous line
cx = lines[cy-1].len;
lines[cy-1].append(current.text);
removelines(cy--, 1);
}
}
break;
case SDLK_LSHIFT:
case SDLK_RSHIFT:
break;
case SDLK_RETURN:
insert('\n');
break;
case SDLK_TAB:
insert('\t');
break;
}
}
void input(const char *str, int len)
{
loopi(len) insert(str[i]);
}
void hit(int hitx, int hity, bool dragged)
{
int maxwidth = linewrap?pixelwidth:-1;
int h = 0;
for(int i = scrolly; i < lines.length(); i++)
{
int width, height;
text_bounds(lines[i].text, width, height, maxwidth);
if(h + height > pixelheight) break;
if(hity >= h && hity <= h+height)
{
int x = text_visible(lines[i].text, hitx, hity-h, maxwidth);
if(dragged) { mx = x; my = i; } else { cx = x; cy = i; };
break;
}
h+=height;
}
}
int limitscrolly()
{
int maxwidth = linewrap?pixelwidth:-1;
int slines = lines.length();
for(int ph = pixelheight; slines > 0 && ph > 0;)
{
int width, height;
text_bounds(lines[slines-1].text, width, height, maxwidth);
if(height > ph) break;
ph -= height;
slines--;
}
return slines;
}
void draw(int x, int y, int color, bool hit)
{
int maxwidth = linewrap?pixelwidth:-1;
int sx, sy, ex, ey;
bool selection = region(sx, sy, ex, ey);
// fix scrolly so that <cx, cy> is always on screen
if(cy < scrolly) scrolly = cy;
else
{
if(scrolly < 0) scrolly = 0;
int h = 0;
for(int i = cy; i >= scrolly; i--)
{
int width, height;
text_bounds(lines[i].text, width, height, maxwidth);
if(h + height > pixelheight) { scrolly = i+1; break; }
h += height;
}
}
if(selection)
{
// convert from cursor coords into pixel coords
int psx, psy, pex, pey;
text_pos(lines[sy].text, sx, psx, psy, maxwidth);
text_pos(lines[ey].text, ex, pex, pey, maxwidth);
int maxy = lines.length();
int h = 0;
for(int i = scrolly; i < maxy; i++)
{
int width, height;
text_bounds(lines[i].text, width, height, maxwidth);
if(h + height > pixelheight) { maxy = i; break; }
if(i == sy) psy += h;
if(i == ey) { pey += h; break; }
h += height;
}
maxy--;
if(ey >= scrolly && sy <= maxy)
{
// crop top/bottom within window
if(sy < scrolly) { sy = scrolly; psy = 0; psx = 0; }
if(ey > maxy) { ey = maxy; pey = pixelheight - FONTH; pex = pixelwidth; }
hudnotextureshader->set();
gle::colorub(0xA0, 0x80, 0x80);
gle::defvertex(2);
gle::begin(GL_QUADS);
if(psy == pey)
{
gle::attribf(x+psx, y+psy);
gle::attribf(x+pex, y+psy);
gle::attribf(x+pex, y+pey+FONTH);
gle::attribf(x+psx, y+pey+FONTH);
}
else
{ gle::attribf(x+psx, y+psy);
gle::attribf(x+psx, y+psy+FONTH);
gle::attribf(x+pixelwidth, y+psy+FONTH);
gle::attribf(x+pixelwidth, y+psy);
if(pey-psy > FONTH)
{
gle::attribf(x, y+psy+FONTH);
gle::attribf(x+pixelwidth, y+psy+FONTH);
gle::attribf(x+pixelwidth, y+pey);
gle::attribf(x, y+pey);
}
gle::attribf(x, y+pey);
gle::attribf(x, y+pey+FONTH);
gle::attribf(x+pex, y+pey+FONTH);
gle::attribf(x+pex, y+pey);
}
gle::end();
}
}
int h = 0;
for(int i = scrolly; i < lines.length(); i++)
{
int width, height;
text_bounds(lines[i].text, width, height, maxwidth);
if(h + height > pixelheight) break;
draw_text(lines[i].text, x, y+h, color>>16, (color>>8)&0xFF, color&0xFF, 0xFF, hit&&(cy==i)?cx:-1, maxwidth);
if(linewrap && height > FONTH) // line wrap indicator
{
hudnotextureshader->set();
gle::colorub(0x80, 0xA0, 0x80);
gle::defvertex(2);
gle::begin(GL_TRIANGLE_STRIP);
gle::attribf(x, y+h+FONTH);
gle::attribf(x, y+h+height);
gle::attribf(x-FONTW/2, y+h+FONTH);
gle::attribf(x-FONTW/2, y+h+height);
gle::end();
}
h+=height;
}
}
};
static vector<editor *> editors;
static editor *textfocus = NULL;
static void readyeditors()
{
loopv(editors) editors[i]->active = (editors[i]->mode==EDITORFOREVER);
}
static void flusheditors()
{
loopvrev(editors) if(!editors[i]->active)
{
editor *e = editors.remove(i);
if(e == textfocus) textfocus = NULL;
delete e;
}
}
static editor *useeditor(const char *name, int mode, bool focus, const char *initval = NULL)
{
loopv(editors) if(!strcmp(editors[i]->name, name))
{
editor *e = editors[i];
if(focus) textfocus = e;
e->active = true;
return e;
}
if(mode < 0) return NULL;
editor *e = new editor(name, mode, initval);
editors.add(e);
if(focus) textfocus = e;
return e;
}
#define TEXTCOMMAND(f, s, d, body) ICOMMAND(f, s, d,\
if(!textfocus || identflags&IDF_OVERRIDDEN) return;\
body\
)
ICOMMAND(textlist, "", (), // @DEBUG return list of all the editors
vector<char> s;
loopv(editors)
{
if(i > 0) s.put(", ", 2);
s.put(editors[i]->name, strlen(editors[i]->name));
}
s.add('\0');
result(s.getbuf());
);
TEXTCOMMAND(textshow, "", (), // @DEBUG return the start of the buffer
editline line;
line.combinelines(textfocus->lines);
result(line.text);
line.clear();
);
ICOMMAND(textfocus, "si", (char *name, int *mode), // focus on a (or create a persistent) specific editor, else returns current name
if(identflags&IDF_OVERRIDDEN) return;
if(*name) useeditor(name, *mode<=0 ? EDITORFOREVER : *mode, true);
else if(editors.length() > 0) result(editors.last()->name);
);
TEXTCOMMAND(textprev, "", (), editors.insert(0, textfocus); editors.pop();); // return to the previous editor
TEXTCOMMAND(textmode, "i", (int *m), // (1= keep while focused, 2= keep while used in gui, 3= keep forever (i.e. until mode changes)) topmost editor, return current setting if no args
if(*m) textfocus->mode = *m;
else intret(textfocus->mode);
);
TEXTCOMMAND(textsave, "s", (char *file), // saves the topmost (filename is optional)
if(*file) textfocus->setfile(path(file, true));
textfocus->save();
);
TEXTCOMMAND(textload, "s", (char *file), // loads into the textfocusmost editor, returns filename if no args
if(*file)
{
textfocus->setfile(path(file, true));
textfocus->load();
}
else if(textfocus->filename) result(textfocus->filename);
);
ICOMMAND(textinit, "sss", (char *name, char *file, char *initval), // loads into named editor if no file assigned and editor has been rendered
{
if(identflags&IDF_OVERRIDDEN) return;
editor *e = NULL;
loopv(editors) if(!strcmp(editors[i]->name, name)) { e = editors[i]; break; }
if(e && e->rendered && !e->filename && *file && (e->lines.empty() || (e->lines.length() == 1 && !strcmp(e->lines[0].text, initval))))
{
e->setfile(path(file, true));
e->load();
}
});
#define PASTEBUFFER "#pastebuffer"
TEXTCOMMAND(textcopy, "", (), editor *b = useeditor(PASTEBUFFER, EDITORFOREVER, false); textfocus->copyselectionto(b););
TEXTCOMMAND(textpaste, "", (), editor *b = useeditor(PASTEBUFFER, EDITORFOREVER, false); textfocus->insertallfrom(b););
TEXTCOMMAND(textmark, "i", (int *m), // (1=mark, 2=unmark), return current mark setting if no args
if(*m) textfocus->mark(*m==1);
else intret(textfocus->region() ? 1 : 2);
);
TEXTCOMMAND(textselectall, "", (), textfocus->selectall(););
TEXTCOMMAND(textclear, "", (), textfocus->clear(););
TEXTCOMMAND(textcurrentline, "", (), result(textfocus->currentline().text););
TEXTCOMMAND(textexec, "i", (int *selected), // execute script commands from the buffer (0=all, 1=selected region only)
char *script = *selected ? textfocus->selectiontostring() : textfocus->tostring();
execute(script);
delete[] script;
);
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