Category talk:Wren-str: Difference between revisions
Content added Content deleted
(Added Str.fromBytes and Str.fromCodePoints methods. Removed type aliases which are no longer needed.) |
(→Source code: Replaced Str.repeat method with a much more efficient version.) |
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chars[j] = t |
chars[j] = t |
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return Strs.concat(chars) |
return Strs.concat(chars) |
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} |
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// Private helper method for 'repeat'. |
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return rs |
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} |
} |
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// Returns 's' repeated 'reps' times. |
// Returns 's' repeated 'reps' times. |
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// If 'chunkSize' is chosen appropriately, this should be much faster than String's * operator |
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// for a large number of repetitions. |
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static repeat(s, reps, chunkSize) { |
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if (!(s is String)) s = "%(s)" |
if (!(s is String)) s = "%(s)" |
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if (!(reps is Num && reps.isInteger && reps > 0)) { |
if (!(reps is Num && reps.isInteger && reps >= 0)) { |
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Fiber.abort("Repetitions must be a |
Fiber.abort("Repetitions must be a non-negative integer.") |
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} |
} |
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if (!(chunkSize is Num && chunkSize.isInteger && chunkSize > 0)) { |
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Fiber.abort("Chunk size must be a positive integer.") |
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} |
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var chunks = (reps/chunkSize).floor |
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if (chunks == 0) return repeat_(s, reps) |
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var lastSize = reps % chunkSize |
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if (lastSize == 0) { |
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lastSize = chunkSize |
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} else { |
} else { |
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while (true) { |
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if (reps % 2 == 1) rs = rs + s |
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} |
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reps = reps >> 1 |
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if (reps == 0) break |
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s = s + s |
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} |
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rs = rs + ((i < chunks - 1) ? chunk : lastChunk) |
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} |
} |
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return rs |
return rs |
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} |
} |
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// Convenience version of the above which uses a 'chunkSize' of 8000. This usually gives a good result. |
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static repeat(s, reps) { repeat(s, reps, 8000) } |
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// Splits a string 's' into chunks of not more than 'size' characters. |
// Splits a string 's' into chunks of not more than 'size' characters. |
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