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Support unicode bytes in string literals. #19

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Merged
webbju merged 1 commit into from
Dec 5, 2025
+71 −47
Merged

Support unicode bytes in string literals. #19

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112 changes: 68 additions & 44 deletions UnrealAngelscriptParser/Grammar/UnrealAngelscriptLexer.g4
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
/*
Adapted to Unreal Angelscript by Embark Studios AB (Fredrik Lindh [Temaran]).
Based on the C++ grammar made by Camilo Sanchez (Camiloasc1) and Martin Mirchev (Marti2203). See the parser file.
*/
Adapted to Unreal Angelscript by Embark Studios AB (originally Fredrik Lindh [Temaran]).
Based on: https://github.com/antlr/grammars-v4/blob/master/cpp/CPP14Lexer.g4
*/

lexer grammar UnrealAngelscriptLexer;

Expand All @@ -17,12 +17,12 @@ FloatingLiteral:
Fractionalconstant Exponentpart? Floatingsuffix?
| Digitsequence Exponentpart Floatingsuffix?;

StringLiteral:
'"""' .*? '"""'
| ('n' | 'f')? '"' (
~["\\\u0085\u2028\u2029]
| Escapesequence
)* '"';
// UnrealAngelscript string literals
// https://angelscript.hazelight.se/scripting/fname-literals/
// https://angelscript.hazelight.se/scripting/format-strings/
fragment Angelscriptstringprefix: 'n' | 'f';

StringLiteral: (Encodingprefix | Angelscriptstringprefix)? (Rawstring | '"' Schar* '"');

BooleanLiteral: False | True;

Expand All @@ -32,54 +32,69 @@ UserDefinedLiteral:
| UserDefinedStringLiteral
| UserDefinedCharacterLiteral;

/*Angelscript*/

Cast: 'Cast';

UClass: 'UCLASS';

UStruct: 'USTRUCT';

UProperty: 'UPROPERTY';

UFunction: 'UFUNCTION';

UEnum: 'UENUM';
/*
Angelscript reserved keywords
https://www.angelcode.com/angelscript/sdk/docs/manual/doc_reserved_keywords.html
*/

UMeta: 'UMETA';
Cast: 'cast';

Import: 'import';

From: 'from';

Out: 'out';
Int: 'int';

Property: 'property';
Int8: 'int8';

Ensure: 'ensure';
Int16: 'int16';

EnsureAlways: 'ensureAlways';
Int32: 'int32';

Check: 'check';
Int64: 'int64';

Mixin: 'mixin';

Int: 'int';
Int8: 'int8';
Int16: 'int16';
Int32: 'int32';
Int64: 'int64';
Property: 'property';

UInt: 'uint';

UInt8: 'uint8';

UInt16: 'uint16';

UInt32: 'uint32';

UInt64: 'uint64';

Float: 'float';

Float32: 'float32';

Float64: 'float64';

Double: 'double';

Bool: 'bool';

/* UnrealAngelscript */

UClass: 'UCLASS';

UStruct: 'USTRUCT';

UProperty: 'UPROPERTY';

UFunction: 'UFUNCTION';

UEnum: 'UENUM';

UMeta: 'UMETA';

Ensure: 'ensure';

EnsureAlways: 'ensureAlways';

Check: 'check';

/*Keywords*/

Auto: 'auto';
Expand Down Expand Up @@ -156,6 +171,8 @@ This: 'this';

True: 'true';

Typedef: 'typedef';

Virtual: 'virtual';

Void: 'void';
Expand Down Expand Up @@ -250,6 +267,10 @@ Semi: ';';

Dot: '.';

fragment Hexquad: HEXADECIMALDIGIT HEXADECIMALDIGIT HEXADECIMALDIGIT HEXADECIMALDIGIT;

fragment Universalcharactername: '\\u' Hexquad | '\\U' Hexquad Hexquad;

Identifier:
/*
Identifiernondigit | Identifier Identifiernondigit | Identifier DIGIT
Expand All @@ -266,9 +287,7 @@ DecimalLiteral: NONZERODIGIT ('\''? DIGIT)*;

OctalLiteral: '0' ('\''? OCTALDIGIT)*;

HexadecimalLiteral: ('0x' | '0X') HEXADECIMALDIGIT (
'\''? HEXADECIMALDIGIT
)*;
HexadecimalLiteral: ('0x' | '0X') HEXADECIMALDIGIT ( '\''? HEXADECIMALDIGIT)*;

BinaryLiteral: ('0b' | '0B') BINARYDIGIT ('\''? BINARYDIGIT)*;

Expand All @@ -292,12 +311,9 @@ fragment Longsuffix: [lL];

fragment Longlongsuffix: 'll' | 'LL';

fragment Cchar: ~ ['\\\r\n] | Escapesequence;
fragment Cchar: ~ ['\\\r\n] | Escapesequence | Universalcharactername;

fragment Escapesequence:
Simpleescapesequence
| Octalescapesequence
| Hexadecimalescapesequence;
fragment Escapesequence: Simpleescapesequence | Octalescapesequence | Hexadecimalescapesequence;

fragment Simpleescapesequence:
'\\\''
Expand Down Expand Up @@ -336,6 +352,10 @@ fragment Floatingsuffix: [flFL];

fragment Encodingprefix: 'u8' | 'u' | 'U' | 'L';

fragment Schar: ~ ["\\\r\n] | Escapesequence | Universalcharactername;

fragment Rawstring: 'R"' ( '\\' ["()] | ~[\r\n (])*? '(' ~[)]*? ')' ( '\\' ["()] | ~[\r\n "])*? '"';

UserDefinedIntegerLiteral:
DecimalLiteral Udsuffix
| OctalLiteral Udsuffix
Expand All @@ -355,7 +375,11 @@ fragment Udsuffix: Identifier;
Whitespace: [ \t]+ -> skip;

Newline: ('\r' '\n'? | '\n') -> skip;

BlockComment: '/*' .*? '*/' -> skip;

LineComment: '//' ~ [\r\n]* -> skip;

PreprocessorBranchRemoval: '#else' .*? '#endif' -> skip;
Preprocessor: ('#if' | '#ifdef' | '#else' | '#endif') ~ [\r\n]* -> skip;

Preprocessor: ('#if' | '#ifdef' | '#else' | '#endif') ~ [\r\n]* -> skip;
6 changes: 3 additions & 3 deletions UnrealAngelscriptParser/Grammar/UnrealAngelscriptParser.g4
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -21,9 +21,9 @@
*/

/*
Adapted to Unreal Angelscript by Embark Studios AB (Fredrik Lindh [Temaran]).
Based on the C++ grammar made by Camilo Sanchez (Camiloasc1) and Martin Mirchev (Marti2203). See the parser file.
*/
Adapted to Unreal Angelscript by Embark Studios AB (originally Fredrik Lindh [Temaran]).
Based on: https://github.com/antlr/grammars-v4/blob/master/cpp/CPP14Parser.g4
*/

parser grammar UnrealAngelscriptParser;
options {
Expand Down
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