Method CalcWordWrapPositionA

KBotExt/imgui/imgui_draw.cpp:3420–3516

Simple word-wrapping for English, not full-featured. Please submit failing cases! This will return the next location to wrap from. If no wrapping if necessary, this will fast-forward to e.g. text_end. FIXME: Much possible improvements (don't cut things like "word !", "word!!!" but cut within "word,,,,", more sensible support for punctuations, support for Unicode punctuations, etc.)

// This will return the next location to wrap from. If no wrapping if necessary, this will fast-forward to e.g. text_end.
// FIXME: Much possible improvements (don't cut things like "word !", "word!!!" but cut within "word,,,,", more sensible support for punctuations, support for Unicode punctuations, etc.)
const char* ImFont::CalcWordWrapPositionA(float scale, const char* text, const char* text_end, float wrap_width) const
{
	// For references, possible wrap point marked with ^
	//  "aaa bbb, ccc,ddd. eee   fff. ggg!"
	//      ^    ^    ^   ^   ^__    ^    ^

	// List of hardcoded separators: .,;!?'"

	// Skip extra blanks after a line returns (that includes not counting them in width computation)
	// e.g. "Hello    world" --> "Hello" "World"

	// Cut words that cannot possibly fit within one line.
	// e.g.: "The tropical fish" with ~5 characters worth of width --> "The tr" "opical" "fish"
	float line_width = 0.0f;
	float word_width = 0.0f;
	float blank_width = 0.0f;
	wrap_width /= scale; // We work with unscaled widths to avoid scaling every characters

	const char* word_end = text;
	const char* prev_word_end = NULL;
	bool inside_word = true;

	const char* s = text;
	IM_ASSERT(text_end != NULL);
	while (s < text_end)
	{
		unsigned int c = (unsigned int)*s;
		const char* next_s;
		if (c < 0x80)
			next_s = s + 1;
		else
			next_s = s + ImTextCharFromUtf8(&c, s, text_end);

		if (c < 32)
		{
			if (c == '\n')
			{
				line_width = word_width = blank_width = 0.0f;
				inside_word = true;
				s = next_s;
				continue;
			}
			if (c == '\r')
			{
				s = next_s;
				continue;
			}
		}

		const float char_width = ((int)c < IndexAdvanceX.Size ? IndexAdvanceX.Data[c] : FallbackAdvanceX);
		if (ImCharIsBlankW(c))
		{
			if (inside_word)
			{
				line_width += blank_width;
				blank_width = 0.0f;
				word_end = s;
			}