com.alibaba.dashscope.utils.StringUtils Maven / Gradle / Ivy
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package com.alibaba.dashscope.utils;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
public class StringUtils {
/*
* * Split src with spliter, return the every part of include spliter eg: src
* "<|im_start|>system", spliter: <|im_start|> the result is: ["<|im_start|>",
* "system"] used in tokenizer.
*/
public static List splitByString(String src, String spliter) {
List parts = new ArrayList<>();
int from = 0;
int first = src.indexOf(spliter, from);
while (first != -1) {
if (from == first) { // starts with special
parts.add(spliter);
from += spliter.length();
} else {
parts.add(src.substring(from, first));
parts.add(spliter);
from += first - from + spliter.length();
}
first = src.indexOf(spliter, from);
}
String remain = src.substring(from);
if (remain.length() > 0) {
parts.add(src.substring(from));
}
return parts;
}
/*
* * Split text by list of string. eg: "<|im_start|>system\nYour are a helpful
* assistant.<|im_end|>\n<|im_start|>user\nSanFrancisco is
* a<|im_end|>\n<|im_start|>assistant\n"; spliters: ["<|im_start|>", "<|im_end|>"]
* result: ["<|im_end|>","system\nYour are a helpful assistant.", "<|im_end|>",
* "\n","<|im_start|>", "user\nSanFrancisco is a", "<|im_end|>", "\n", "<|im_start|>",
* "assistant\n" ]
*/
public static List splitByStrings(String text, Collection spliters) {
List chunks = new ArrayList<>();
chunks.add(text);
for (String specialToken : spliters) {
List thisSplits = new ArrayList<>();
for (String chunk : chunks) {
thisSplits.addAll(splitByString(chunk, specialToken));
}
chunks = thisSplits;
}
return chunks;
}
}