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#include "richtext.h"
static int matchIRCColourString(const char *str, int pos, int *result) {
// First, try to match a single digit.
if (str[pos] >= '0' && str[pos] <= '9') {
int first = str[pos] - '0';
if (str[pos + 1] >= '0' && str[pos + 1] <= '9') {
int second = str[pos + 1] - '0';
int attempt = (first * 10) + second;
if (attempt < 0 || attempt > 15) {
// Invalid number, give up here
return pos;
} else {
// Valid number!
*result = attempt;
return pos + 2;
}
} else {
// Second character was not a digit, so
// let's take the colour we *did* parse as is
*result = first;
return pos + 1;
}
} else {
// First character was not a digit, so pass entirely.
return pos;
}
}
static int matchIRCColourPair(const char *str, int pos, int *whichFG, int *whichBG) {
// str[pos] is the first character following the
// \x03 colour code.
*whichFG = -1;
*whichBG = -1;
pos = matchIRCColourString(str, pos, whichFG);
if (*whichFG != -1) {
if (str[pos] == ',') {
pos = matchIRCColourString(str, pos + 1, whichBG);
}
}
return pos;
}
void RichTextBuilder::appendIRC(const char *str) {
// We're up for fun here!
const int colLayer = COL_LEVEL_IRC;
bool b = false, i = false, u = false;
int activeFG = COL_DEFAULT_FG, activeBG = COL_DEFAULT_BG;
int pos = 0;
int len = strlen(str);
while (pos < len) {
char ch = str[pos];
if (ch < 0 || ch == 7 || ch == 10 || ch >= 0x20) {
// Pass this character through unfiltered.
writeU8(ch);
pos++;
continue;
}
// IRC control code, but what?
if (ch == 2) {
b = !b;
if (b)
bold();
else
endBold();
} else if (ch == 0x1D) {
i = !i;
if (i)
italic();
else
endItalic();
} else if (ch == 0x1F) {
u = !u;
if (u)
underline();
else
endUnderline();
} else if (ch == 0xF) {
// Reset all formatting
if (b) {
endBold();
b = false;
}
if (i) {
endItalic();
i = false;
}
if (u) {
endUnderline();
u = false;
}
if (activeFG != COL_DEFAULT_FG) {
endForeground(colLayer);
activeFG = COL_DEFAULT_FG;
}
if (activeBG != COL_DEFAULT_BG) {
endBackground(colLayer);
activeBG = COL_DEFAULT_BG;
}
} else if (ch == 0x16) {
// Reverse
int swap = activeBG;
activeBG = activeFG;
activeFG = swap;
if (activeFG == COL_DEFAULT_FG)
endForeground(colLayer);
else
foreground(colLayer, activeFG);
if (activeBG == COL_DEFAULT_BG)
endBackground(colLayer);
else
background(colLayer, activeBG);
} else if (ch == 3) {
// Colours!
int whichFG = -1, whichBG = -1;
pos = matchIRCColourPair(str, pos + 1, &whichFG, &whichBG);
if (whichFG == -1) {
if (activeFG != COL_DEFAULT_FG) {
activeFG = COL_DEFAULT_FG;
endForeground(colLayer);
}
} else {
activeFG = whichFG;
foreground(colLayer, whichFG);
}
if (whichBG == -1) {
if (whichFG == -1 && activeBG != COL_DEFAULT_BG) {
activeBG = COL_DEFAULT_BG;
endBackground(colLayer);
}
} else {
activeBG = whichBG;
background(colLayer, whichBG);
}
continue;
}
pos++;
}
// Clean up any leftover state.
if (b)
endBold();
if (i)
endItalic();
if (u)
endUnderline();
if (activeFG != COL_DEFAULT_FG)
endForeground(colLayer);
if (activeBG != COL_DEFAULT_BG)
endBackground(colLayer);
}
const char *RichTextBuilder::c_str() {
if (size() == 0 || data()[size() - 1] != 0)
writeU8(0);
return data();
}
inline static float hslValue(float n1, float n2, float hue) {
if (hue > 6.0f)
hue -= 6.0f;
else if (hue < 0.0f)
hue += 6.0f;
if (hue < 1.0f)
return n1 + (n2 - n1) * hue;
else if (hue < 3.0f)
return n2;
else if (hue < 4.0f)
return n1 + (n2 - n1) * (4.0f - hue);
else
return n1;
}
void calculateHSL(float h, float s, float l, uint8_t *r, uint8_t *g, uint8_t *b) {
// make it RGB
if (s == 0) {
*r = *g = *b = l*255.0f;
} else {
float m1, m2;
if (l <= 0.5f)
m2 = l * (1.0f + s);
else
m2 = l + s - l * s;
m1 = 2.0f * s - m2;
*r = hslValue(m1, m2, h * 6.0f + 2.0) * 255.0f;
*g = hslValue(m1, m2, h * 6.0f) * 255.0f;
*b = hslValue(m1, m2, h * 6.0f - 2.0) * 255.0f;
}
}
void RichTextBuilder::appendNick(const char *nick) {
uint32_t hash = 0;
const char *c = nick;
while (*c)
hash = (hash * 17) + *(c++);
int hueBase = ((hash & 0xFF0000) >> 16);
int satBase = ((hash & 0xFF00) >> 8);
int lumBase = (hash & 0xFF);
uint8_t r, g, b;
calculateHSL(
hueBase / 255.0f,
(0.50f + (satBase / 765.0f)),
(0.40f + (lumBase / 1020.0f)),
&r, &g, &b);
foreground(COL_LEVEL_NICK, r, g, b);
append(nick);
endForeground(COL_LEVEL_NICK);
}
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