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explain incomplete escape sequence handling (IDEA-CR-19217)

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Sergey Simonchik
2017-04-03 14:51:23 +03:00
parent e8e08693f7
commit dbf64509e9
1 changed files with 9 additions and 1 deletions
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platform/platform-api/src/com/intellij/execution/process/AnsiEscapeDecoder.java
+9 -1
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@@ -174,7 +174,15 @@ public class AnsiEscapeDecoder {
/**
* Returns end index of all consecutive escape sequences started at {@code firstEscSeqBeginInd}, or
* negative number if not found: -1 - (length of string suffix to keep in case of an incomplete last escape sequence).
* a negative number if not found. Since an escape sequence could be split among several subsequent output chunks
* (e.g. because of automatic flushing of standard stream when its buffer is full), it should be parsed
* when all the needed output chunks are available. To achieve that, the return value encodes
* the length of the passed string suffix to keep in case of an incomplete last escape sequence:
* {@code -1 - (length of string suffix to keep in case of an incomplete last escape sequence)}. </p>
* If the return value is -1, no string suffix should be kept => a malformed escape sequence has been encountered.
* If the return value is less than -1, no actual handing of the incomplete escape sequence should be performed,
* the string suffix length should be decoded with {@code #decodeUnhandledSuffixLength(the return value)} and the suffix
* should be preserved until the next output chunks is available.
*/
private static int findConsecutiveEscSequencesEndIndex(@NotNull String text, int firstEscSeqBeginInd) {
int escSeqBeginInd = firstEscSeqBeginInd;