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package net.brokenfox.vulpirc;
import android.graphics.Typeface;
import android.text.SpannableStringBuilder;
import android.text.Spanned;
import android.text.style.BackgroundColorSpan;
import android.text.style.ForegroundColorSpan;
import android.text.style.StyleSpan;
import android.text.style.UnderlineSpan;
import java.util.HashMap;
/**
* Created by ninji on 2/14/14.
*/
public class RichText {
private final static int[] presetColors = new int[] {
// IRC colours
0xFFFFFF, 0x000000, 0x000080, 0x008000,
0xFF0000, 0x800000, 0x800080, 0x808000,
0xFFFF00, 0x00FF00, 0x008080, 0x00FFFF,
0x0000FF, 0xFF00FF, 0x808080, 0xC0C0C0,
// Default FG, BG
0xFFFFFF, 0x000000,
// Preset message colours
0x6600CC, 0x009900, 0x660000, 0x660000,
0x660000, 0x336699,
};
private final static StyleSpan boldSpan = new StyleSpan(Typeface.BOLD);
private final static StyleSpan italicSpan = new StyleSpan(Typeface.ITALIC);
private final static UnderlineSpan underlineSpan = new UnderlineSpan();
private static ForegroundColorSpan[] presetForegroundSpans = null;
private static BackgroundColorSpan[] presetBackgroundSpans = null;
private static HashMap<Integer, ForegroundColorSpan> cachedForegroundSpans = new HashMap<Integer, ForegroundColorSpan>();
private static HashMap<Integer, BackgroundColorSpan> cachedBackgroundSpans = new HashMap<Integer, BackgroundColorSpan>();
private static void setupPresets() {
presetForegroundSpans = new ForegroundColorSpan[presetColors.length];
presetBackgroundSpans = new BackgroundColorSpan[presetColors.length];
for (int i = 0; i < presetColors.length; i++) {
presetForegroundSpans[i] = new ForegroundColorSpan(0xFF000000 | presetColors[i]);
presetBackgroundSpans[i] = new BackgroundColorSpan(0xFF000000 | presetColors[i]);
}
}
// This is kinda kludgey but... I don't want to make two extra allocations
// every time I process a string.
// So here.
private static ForegroundColorSpan[] currentFgSpans = new ForegroundColorSpan[4];
private static BackgroundColorSpan[] currentBgSpans = new BackgroundColorSpan[4];
public static Spanned process(String source) {
if (presetForegroundSpans == null)
setupPresets();
SpannableStringBuilder s = new SpannableStringBuilder();
int boldStart = -1;
int italicStart = -1;
int underlineStart = -1;
int fgStart = -1, bgStart = -1;
ForegroundColorSpan fgSpan = null;
BackgroundColorSpan bgSpan = null;
int rawTextStart = -1;
for (int i = 0; i < 4; i++) {
currentFgSpans[i] = null;
currentBgSpans[i] = null;
}
int in = 0, out = 0;
for (in = 0; in < source.length(); in++) {
char c = source.charAt(in);
if (c >= 0 && c <= 0x1F) {
// Control code!
if (rawTextStart != -1) {
s.append(source, rawTextStart, in);
rawTextStart = -1;
}
// Process the code...
if (c == 1 && boldStart == -1) {
boldStart = out;
} else if (c == 2 && boldStart > -1) {
s.setSpan(boldSpan, boldStart, out, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
boldStart = -1;
} else if (c == 3 && italicStart == -1) {
italicStart = out;
} else if (c == 4 && italicStart > -1) {
s.setSpan(italicSpan, italicStart, out, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
italicStart = -1;
} else if (c == 5 && underlineStart == -1) {
underlineStart = out;
} else if (c == 6 && underlineStart > -1) {
s.setSpan(underlineSpan, underlineStart, out, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
underlineStart = -1;
} else if (c >= 0x10 && c <= 0x1F) {
boolean isBG = ((c & 4) == 4);
boolean isEnd = ((c & 8) == 8);
int layer = (c & 3);
// Read what comes afterwards, to decide what we're doing
Object chosenSpan = null;
if (!isEnd && ((in + 1) < source.length())) {
char first = source.charAt(in + 1);
if ((first & 1) == 1) {
// Preset colour
if (isBG)
chosenSpan = presetBackgroundSpans[first >> 1];
else
chosenSpan = presetForegroundSpans[first >> 1];
in++; // Skip the extra
} else if ((in + 3) < source.length()) {
// RGB colour
int r = first;
int g = source.charAt(in + 2);
int b = source.charAt(in + 3);
int col = 0xFF000000 | (r << 17) | (g << 9) | (b << 1);
if (isBG) {
if (cachedBackgroundSpans.containsKey(col)) {
chosenSpan = cachedBackgroundSpans.get(col);
} else {
chosenSpan = new BackgroundColorSpan(col);
cachedBackgroundSpans.put(col, (BackgroundColorSpan)chosenSpan);
}
} else {
if (cachedForegroundSpans.containsKey(col)) {
chosenSpan = cachedForegroundSpans.get(col);
} else {
chosenSpan = new ForegroundColorSpan(col);
cachedForegroundSpans.put(col, (ForegroundColorSpan)chosenSpan);
}
}
in += 3; // Skip the extra
}
}
// OK, are we actually changing?
Object oldSpan, newSpan = null;
if (isBG)
oldSpan = bgSpan;
else
oldSpan = fgSpan;
// Modify the array, and figure out our new active span
if (isBG) {
if (isEnd)
currentBgSpans[layer] = null;
else
currentBgSpans[layer] = (BackgroundColorSpan)chosenSpan;
for (int i = 0; i < 4; i++)
if (currentBgSpans[i] != null)
newSpan = currentBgSpans[i];
} else {
if (isEnd)
currentFgSpans[layer] = null;
else
currentFgSpans[layer] = (ForegroundColorSpan)chosenSpan;
for (int i = 0; i < 4; i++)
if (currentFgSpans[i] != null)
newSpan = currentFgSpans[i];
}
// If we changed spans....
if (oldSpan != newSpan) {
// End the existing span, no matter what...
if (isBG) {
if (bgStart > -1) {
s.setSpan(bgSpan, bgStart, out, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
bgStart = -1;
}
} else {
if (fgStart > -1) {
s.setSpan(fgSpan, fgStart, out, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
fgStart = -1;
}
}
// .. and if we have another span, add it!
if (newSpan != null) {
// Preset colour
if (isBG) {
bgSpan = (BackgroundColorSpan)newSpan;
bgStart = out;
} else {
fgSpan = (ForegroundColorSpan)newSpan;
fgStart = out;
}
}
}
}
} else {
// Regular character.
if (rawTextStart == -1) {
rawTextStart = in;
}
out++;
}
}
// Anything left?
if (rawTextStart != -1) {
s.append(source, rawTextStart, source.length());
}
// Any un-applied spans?
if (boldStart > -1)
s.setSpan(boldSpan, boldStart, out, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
if (italicStart > -1)
s.setSpan(italicSpan, italicStart, out, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
if (underlineStart > -1)
s.setSpan(underlineSpan, underlineStart, out, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
if (bgStart > -1)
s.setSpan(bgSpan, bgStart, out, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
if (fgStart > -1)
s.setSpan(fgSpan, fgStart, out, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
return s;
}
}
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