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Merge pull request #64564 from timothyqiu/word-wrap-3.x

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[3.x] Fix `String::word_wrap()` for long words
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Rémi Verschelde 2022-11-24 16:06:52 +01:00 • committed by GitHub
commit 4769aa4499
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2 changed files with 87 additions and 21 deletions
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72
core/ustring.cpp
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@ -3428,33 +3428,63 @@ bool String::is_valid_identifier() const {
return true;
}
//kind of poor should be rewritten properly
String String::word_wrap(int p_chars_per_line) const {
int from = 0;
int last_space = 0;
String ret;
int line_start = 0;
int line_end = 0; // End of last word on current line.
int word_start = 0; // -1 if no word encountered. Leading spaces are part of a word.
int word_length = 0;
for (int i = 0; i < length(); i++) {
if (i - from >= p_chars_per_line) {
if (last_space == -1) {
ret += substr(from, i - from + 1) + "\n";
} else {
ret += substr(from, last_space - from) + "\n";
i = last_space; //rewind
}
from = i + 1;
last_space = -1;
} else if (operator[](i) == ' ' || operator[](i) == '\t') {
last_space = i;
} else if (operator[](i) == '\n') {
ret += substr(from, i - from) + "\n";
from = i + 1;
last_space = -1;
const CharType c = operator[](i);
switch (c) {
case '\n': {
// Force newline.
ret += substr(line_start, i - line_start + 1);
line_start = i + 1;
line_end = line_start;
word_start = line_start;
word_length = 0;
} break;
case ' ':
case '\t': {
// A whitespace ends current word.
if (word_length > 0) {
line_end = i - 1;
word_start = -1;
word_length = 0;
}
} break;
default: {
if (word_start == -1) {
word_start = i;
}
word_length += 1;
if (word_length > p_chars_per_line) {
// Word too long: wrap before current character.
ret += substr(line_start, i - line_start) + "\n";
line_start = i;
line_end = i;
word_start = i;
word_length = 1;
} else if (i - line_start + 1 > p_chars_per_line) {
// Line too long: wrap after the last word.
ret += substr(line_start, line_end - line_start + 1) + "\n";
line_start = word_start;
line_end = line_start;
}
} break;
}
}
if (from < length()) {
ret += substr(from, length());
const int remaining = length() - line_start;
if (remaining) {
ret += substr(line_start, remaining);
}
return ret;