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hexadecimal escapes #1

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Merged
lmasroca merged 9 commits into from
Oct 3, 2025
Merged

hexadecimal escapes #1

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aafcf38
Create test.txt
lmasroca Aug 7, 2025
58e9f70
hexadecimal escapes
lmasroca Aug 14, 2025
8aa402e
Merge branch 'WebFuzzing:master' into test
lmasroca Aug 21, 2025
00c352b
Merge branch 'WebFuzzing:master' into test
lmasroca Sep 5, 2025
5d6ed80
Merge branch 'WebFuzzing:master' into test
lmasroca Sep 19, 2025
b88f1d2
tests for invalid escapes
lmasroca Sep 30, 2025
931a4b0
added support for unicode escapes (e.g.: "\u0000", "\uaaaa", etc.)
lmasroca Sep 30, 2025
04ff031
small refactor
lmasroca Oct 3, 2025
2305c16
small refactor
lmasroca Oct 3, 2025
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28 changes: 17 additions & 11 deletions core/src/main/antlr4/org/evomaster/core/parser/RegexEcma262.g4
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Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,7 @@ grammar RegexEcma262;
//------ PARSER ------------------------------
// Parser rules have first letter in lower-case

pattern : disjunction;
pattern : disjunction EOF;


disjunction
Expand Down Expand Up @@ -96,13 +96,13 @@ atom


//TODO
//CharacterEscape
CharacterEscape
// : ControlEscape
// | 'c' ControlLetter
// | HexEscapeSequence
// | UnicodeEscapeSequence
: HexEscapeSequence
| UnicodeEscapeSequence
//| IdentityEscape
// ;
;

//TODO
//ControlEscape
Expand Down Expand Up @@ -205,7 +205,7 @@ AtomEscape
: '\\' CharacterClassEscape
//TODO
// | '\\' DecimalEscape
// | '\\' CharacterEscape
| '\\' CharacterEscape
;

fragment CharacterClassEscape
Expand Down Expand Up @@ -238,11 +238,17 @@ BaseChar
: ~[0-9,^$\\.*+?()[\]{}|-]
;

//TODO
//HexEscapeSequence
// : 'x' HexDigit HexDigit
// ;
//
UnicodeEscapeSequence
: 'u' HexDigit HexDigit HexDigit HexDigit
;

HexEscapeSequence
: 'x' HexDigit HexDigit
;

fragment HexDigit:
[a-fA-F0-9]
;

//TODO
//DecimalIntegerLiteral
Expand Down
28 changes: 17 additions & 11 deletions core/src/main/antlr4/org/evomaster/core/parser/RegexJava.g4
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Expand Up @@ -23,7 +23,7 @@ grammar RegexJava;
//------ PARSER ------------------------------
// Parser rules have first letter in lower-case

pattern : disjunction;
pattern : disjunction EOF;


disjunction
Expand Down Expand Up @@ -119,13 +119,13 @@ quoteChar
;

//TODO
//CharacterEscape
CharacterEscape
// : ControlEscape
// | 'c' ControlLetter
// | HexEscapeSequence
// | UnicodeEscapeSequence
: HexEscapeSequence
| UnicodeEscapeSequence
//| IdentityEscape
// ;
;

//TODO
//ControlEscape
Expand Down Expand Up @@ -230,7 +230,7 @@ AtomEscape
: '\\' CharacterClassEscape
//TODO
// | '\\' DecimalEscape
// | '\\' CharacterEscape
| '\\' CharacterEscape
;

fragment CharacterClassEscape
Expand Down Expand Up @@ -267,11 +267,17 @@ BaseChar
: ~[0-9,^$\\.*+?()[\]{}|-]
;

//TODO
//HexEscapeSequence
// : 'x' HexDigit HexDigit
// ;
//
UnicodeEscapeSequence:
'u' HexDigit HexDigit HexDigit HexDigit
;

HexEscapeSequence
: 'x' HexDigit HexDigit
;

fragment HexDigit:
[a-fA-F0-9]
;

//TODO
//DecimalIntegerLiteral
Expand Down
23 changes: 19 additions & 4 deletions core/src/main/kotlin/org/evomaster/core/parser/GeneRegexEcma262Visitor.kt
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Expand Up @@ -2,6 +2,7 @@ package org.evomaster.core.parser

import org.evomaster.core.search.gene.regex.*

private const val EOF_TOKEN = "<EOF>"
/**
* Parser Visitor based on the RegexEcma262.g4 grammar file
*/
Expand All @@ -16,7 +17,8 @@ class GeneRegexEcma262Visitor : RegexEcma262BaseVisitor<VisitResult>(){

val disjList = DisjunctionListRxGene(res.genes.map { it as DisjunctionRxGene })

val gene = RegexGene("regex", disjList,"${RegexGene.JAVA_REGEX_PREFIX}$text")
// we remove the <EOF> token from end of the string to store as sourceRegex
val gene = RegexGene("regex", disjList,"${RegexGene.JAVA_REGEX_PREFIX}${text.substring(0,text.length - EOF_TOKEN.length)}")

return VisitResult(gene)
}
Expand Down Expand Up @@ -166,9 +168,22 @@ class GeneRegexEcma262Visitor : RegexEcma262BaseVisitor<VisitResult>(){
return VisitResult(gene)
}

if(ctx.AtomEscape() != null){
val char = ctx.AtomEscape().text[1].toString()
return VisitResult(CharacterClassEscapeRxGene(char))
if(ctx.AtomEscape() != null) {
val txt = ctx.AtomEscape().text
when {
txt[1] == 'x' || txt[1] == 'u' -> {
val hexValue =
txt.subSequence(2, txt.length).toString().toInt(16)
return VisitResult(
PatternCharacterBlockGene(
txt,
hexValue.toChar().toString()
)
)
}

else -> return VisitResult(CharacterClassEscapeRxGene(txt[1].toString()))
}
}

if(ctx.disjunction() != null){
Expand Down
20 changes: 17 additions & 3 deletions core/src/main/kotlin/org/evomaster/core/parser/GeneRegexJavaVisitor.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@ package org.evomaster.core.parser

import org.evomaster.core.search.gene.regex.*

private const val EOF_TOKEN = "<EOF>"
/**
* Created by arcuri82 on 11-Sep-19.
*/
Expand All @@ -16,7 +17,8 @@ class GeneRegexJavaVisitor : RegexJavaBaseVisitor<VisitResult>(){

val disjList = DisjunctionListRxGene(res.genes.map { it as DisjunctionRxGene })

val gene = RegexGene("regex", disjList,"${RegexGene.JAVA_REGEX_PREFIX}$text")
// we remove the <EOF> token from end of the string to store as sourceRegex
val gene = RegexGene("regex", disjList,"${RegexGene.JAVA_REGEX_PREFIX}${text.substring(0, text.length - EOF_TOKEN.length)}")

return VisitResult(gene)
}
Expand Down Expand Up @@ -179,8 +181,20 @@ class GeneRegexJavaVisitor : RegexJavaBaseVisitor<VisitResult>(){
}

if(ctx.AtomEscape() != null){
val char = ctx.AtomEscape().text[1].toString()
return VisitResult(CharacterClassEscapeRxGene(char))
val txt = ctx.AtomEscape().text
when {
txt[1] == 'x' || txt[1] == 'u' -> {
val hexValue =
txt.subSequence(2, txt.length).toString().toInt(16)
return VisitResult(
PatternCharacterBlockGene(
txt,
hexValue.toChar().toString()
)
)
}
else -> return VisitResult(CharacterClassEscapeRxGene(txt[1].toString()))
}
}

if(ctx.disjunction() != null){
Expand Down
10 changes: 10 additions & 0 deletions core/src/test/kotlin/org/evomaster/core/parser/GeneRegexEcma262VisitorTest.kt
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Expand Up @@ -326,4 +326,14 @@ open class GeneRegexEcma262VisitorTest : RegexTestTemplate(){
// p = 1 / 2^6 = 1 / 64
checkCanSample("^((a|A)(b|B)(c|C)123(e|E)(f|F)(d|D))$", "aBc123EFd", 10_000)
}

@Test
fun testHexEscape(){
checkSameAsJava("""\x00\x0a\xba\xFF""")

@jgaleotti jgaleotti Sep 23, 2025

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are there any tests for "invalid" hex values?
What happens if "\xF" or "\xX" is tested?

}

@Test
fun testUnicodeEscape(){
checkSameAsJava("""\u0000\u0a0b\uffff""")
}
}
11 changes: 11 additions & 0 deletions core/src/test/kotlin/org/evomaster/core/parser/RegexHandlerTest.kt
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Expand Up @@ -121,4 +121,15 @@ internal class RegexHandlerTest{

}

@Test
fun testCreateGeneForJVMInvalidRegex() {

assertThrows(ParseCancellationException::class.java) { RegexHandler.createGeneForJVM("\\xR") }
}

@Test
fun testCreateGeneForEcma262InvalidRegex() {

assertThrows(ParseCancellationException::class.java) { RegexHandler.createGeneForEcma262("\\xR") }
}
}