var GLYPH = /([\0-\u02FF\u0370-\u1DBF\u1E00-\u20CF\u2100-\uD7FF\uDC00-\uFE1F\uFE30-\uFFFF]|[\uD800-\uDBFF][\uDC00-\uDFFF]|[\uD800-\uDBFF])([\u0300-\u036F\u1DC0-\u1DFF\u20D0-\u20FF\uFE20-\uFE2F]*)/g;
- function diffLerp(source, target, amount ) {
- /** Interpolate between two strings using edit operations
-
- This interpolation algorithm applys a partial edit of one
- string into the other. This produces nice looking results,
- but can take a significant amount of time and memory to
- compute the edits. It is not recommended for strings
- longer than a few hundred characters.
- */
-
+ function diffLerpAstral(source, target, amount) {
// If given strings with astral codepoints or combining
// characters, split them into arrays of "glyphs" first,
// do the edit on the list of "glyphs", and rejoin them.
// This split is not perfect for all languages, but at least
// it won't create invalid surrogate pairs or orphaned
// combining characters.
- //
- // TODO: The way this is called is a hack.
- if (source.match && (source.match(MULTI) || target.match(MULTI))) {
- var sourceGlyphs = source.match(GLYPH) || [];
- var targetGlyphs = target.match(GLYPH) || [];
- return diffLerp(sourceGlyphs, targetGlyphs, amount).join("");
- }
-
+ var sourceGlyphs = source.match(GLYPH) || [];
+ var targetGlyphs = target.match(GLYPH) || [];
+ var edits = diff(targetGlyphs, sourceGlyphs, 2, 2, 3);
// The edit path works from the string end, forwards, because
// that's how Levenshtein edits work. To match LTR reading
// direction (and the behavior of fastLerp), swap the strings
// and invert the parameter when editing.
+ var partial = edits.slice(0, Math.round((1 - amount) * edits.length));
+ return patchArray(partial, targetGlyphs).join("");
+ }
+
+ function diffLerpBasic(source, target, amount) {
var edits = diff(target, source, 2, 2, 3);
+ // The edit path works from the string end, forwards, because
+ // that's how Levenshtein edits work. To match LTR reading
+ // direction (and the behavior of fastLerp), swap the strings
+ // and invert the parameter when editing.
var partial = edits.slice(0, Math.round((1 - amount) * edits.length));
- return patch(partial, target);
+ return patchString(partial, target);
+ }
+
+ function diffLerp(source, target, amount) {
+ /** Interpolate between two strings using edit operations
+
+ This interpolation algorithm applys a partial edit of one
+ string into the other. This produces nice looking results,
+ but can take a significant amount of time and memory to
+ compute the edits. It is not recommended for strings
+ longer than a few hundred characters.
+ */
+
+ if (source.match(MULTI) || target.match(MULTI))
+ return diffLerpAstral(source, target, amount);
+ else
+ return diffLerpBasic(source, target, amount);
}
var NUMBERS = /(-?\d{1,20}(?:\.\d{1,20})?)/g;
Numbers may have a leading "-" and a single "." to mark
the decimal point, but something must be after the ".".
No other floating point syntax (e.g. 1e6) is supported.
- If both of the numbers in a pair are integers, the result
- is clamped to an integer.
+ They are treated as fixed-point values, with the point's
+ position itself interpolating.
- For example, numericLerp("0.0", "100", 0.123) === "12.3"
+ For example, numericLerp("0.0", "100".0, 0.123) === "12.3"
because the "." in "0.0" is interpreted as a decimal
point. But numericLerp("0.", "100.", 0.123) === "12."
because the strings are interpreted as integers followed
projects / string-lerp.git / blobdiff