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80 changes: 80 additions & 0 deletions
80
modules/core/src/main/antlr4/org/apache/synapse/util/synapse_expression/ExpressionLexer.g4
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,80 @@ | ||
| lexer grammar ExpressionLexer; | ||
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| JSONPATH_PARAMS: 'in' | 'nin' | 'subsetof' | 'anyof' | 'noneof' | 'size' | 'empty' | '=~'; | ||
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| JSONPATH_FUNCTIONS: 'length()' | 'size()' | 'min()' | 'max()' | 'avg()' | 'sum()' | 'stddev()' | 'keys()' | 'first()' | 'last()'; | ||
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| // Tokens for identifiers, operators, and keywords | ||
| VAR: 'var'; | ||
| PAYLOAD: 'payload' | '$'; | ||
| HEADERS: 'headers'; | ||
| CONFIG: 'config'; | ||
| ATTRIBUTES: 'attributes' | 'attr'; | ||
| AND: 'and' | '&&'; | ||
| OR: 'or' | '||'; | ||
| NOT: '!'; | ||
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| DOUBLE_DOT : '..'; | ||
| ASTERISK : '*'; | ||
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| // Operators | ||
| PLUS: '+'; | ||
| MINUS: '-'; | ||
| DIV: '/'; | ||
| MODULO: '%'; | ||
| EQ: '=='; | ||
| NEQ: '!='; | ||
| GT: '>'; | ||
| LT: '<'; | ||
| GTE: '>='; | ||
| LTE: '<='; | ||
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| // Delimiters | ||
| LPAREN: '('; | ||
| RPAREN: ')'; | ||
| LBRACKET: '['; | ||
| RBRACKET: ']'; | ||
| DOT: '.'; | ||
| COMMA: ','; | ||
| COLON: ':'; | ||
| QUOTE: '"' | '\''; | ||
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| // Literals | ||
| BOOLEAN_LITERAL: 'true' | 'false'; | ||
| NUMBER: '-'? [0-9]+ ('.' [0-9]+)?; | ||
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| STRING_LITERAL : ('"' (ESC | ~["\\])* '"' | '\'' (ESC | ~['\\])* '\''); | ||
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| fragment ESC | ||
| : '\\' [btnfr"'\\/] // Basic escape sequences | ||
| | UNICODE_ESC | ||
| | OCTAL_ESC | ||
| ; | ||
| fragment UNICODE_ESC | ||
| : '\\' 'u' HEX_DIGIT HEX_DIGIT HEX_DIGIT HEX_DIGIT | ||
| ; | ||
| fragment OCTAL_ESC | ||
| : '\\' [0-3]? [0-7] [0-7] | ||
| ; | ||
| fragment HEX_DIGIT | ||
| : [0-9a-fA-F] | ||
| ; | ||
| NULL_LITERAL | ||
| : 'null' // Define null as a recognized keyword | ||
| ; | ||
| // Identifiers | ||
| ID: [a-zA-Z_][a-zA-Z_0-9]*; | ||
| // Special symbols for JSONPath filter expressions | ||
| QUESTION: '?'; | ||
| AT: '@'; | ||
| // Whitespace | ||
| WS: [ \t\n\r]+ -> skip; |
147 changes: 147 additions & 0 deletions
147
modules/core/src/main/antlr4/org/apache/synapse/util/synapse_expression/ExpressionParser.g4
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,147 @@ | ||
| parser grammar ExpressionParser; | ||
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| options { | ||
| tokenVocab = ExpressionLexer; | ||
| } | ||
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| expression | ||
| : comparisonExpression | ||
| | conditionalExpression | ||
| | EOF | ||
| ; | ||
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| conditionalExpression | ||
| : comparisonExpression (QUESTION expression COLON expression)? | ||
| ; | ||
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| comparisonExpression | ||
| : logicalExpression ( (GT | LT | GTE | LTE | EQ | NEQ) logicalExpression )* | ||
| | logicalExpression (EQ | NEQ) NULL_LITERAL | ||
| ; | ||
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| logicalExpression | ||
| : arithmeticExpression (AND logicalExpression | OR logicalExpression)? | ||
| ; | ||
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| arithmeticExpression | ||
| : term ( (PLUS | MINUS) term )* | ||
| ; | ||
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| term | ||
| : factor ( (ASTERISK | DIV | MODULO) factor )* | ||
| ; | ||
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| factor | ||
| : literal | ||
| | functionCall | ||
| | variableAccess | ||
| | payloadAccess | ||
| | headerAccess | ||
| | configAccess | ||
| | attributeAccess | ||
| | LPAREN expression RPAREN | ||
| ; | ||
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| configAccess | ||
| : CONFIG propertyName | ||
| ; | ||
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| headerAccess | ||
| : HEADERS propertyName | ||
| ; | ||
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| attributeAccess | ||
| : ATTRIBUTES (DOT ID propertyName) | ||
| ; | ||
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| propertyName | ||
| : DOT ID | ||
| | (DOT)? LBRACKET STRING_LITERAL RBRACKET | ||
| ; | ||
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| literal | ||
| : arrayLiteral | ||
| | BOOLEAN_LITERAL | ||
| | NUMBER | ||
| | STRING_LITERAL | ||
| | NULL_LITERAL | ||
| ; | ||
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| jsonPathExpression | ||
| :( DOT JSONPATH_FUNCTIONS | ||
| |DOUBLE_DOT ASTERISK | ||
| | DOUBLE_DOT ID | ||
| | DOT ID | ||
| | (DOT)? LBRACKET arrayIndex RBRACKET | ||
| | DOT ASTERISK | ||
| | DOUBLE_DOT ID (LBRACKET arrayIndex RBRACKET)?)+ | ||
| ; | ||
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| variableAccess | ||
| : VAR ( DOT ID | ||
| | DOT STRING_LITERAL | ||
| | (DOT)? LBRACKET STRING_LITERAL RBRACKET // Bracket notation: var["variableName"] | ||
| ) | ||
| ( jsonPathExpression )? | ||
| ; | ||
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| arrayLiteral | ||
| : LBRACKET (expression (COMMA expression)*)? RBRACKET // Array with zero or more literals, separated by commas | ||
| ; | ||
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| payloadAccess | ||
| : PAYLOAD ( jsonPathExpression)? | ||
| ; | ||
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| arrayIndex | ||
| : NUMBER | ||
| | STRING_LITERAL | ||
| | expression | ||
| | multipleArrayIndices | ||
| | sliceArrayIndex | ||
| | expression ( (PLUS | MINUS | ASTERISK | DIV ) expression)* | ||
| | ASTERISK | ||
| | QUESTION? filterExpression | ||
| ; | ||
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| multipleArrayIndices | ||
| : expression (COMMA expression)+ | ||
| ; | ||
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| sliceArrayIndex | ||
| : signedExpressions? COLON signedExpressions? (COLON signedExpressions?)? | ||
| ; | ||
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| signedExpressions | ||
| : MINUS? expression | ||
| ; | ||
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| filterExpression | ||
| : (filterComponent)+ | ||
| ; | ||
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| filterComponent | ||
| : variableAccess | ||
| | payloadAccess | ||
| | headerAccess | ||
| | configAccess | ||
| | attributeAccess | ||
| | functionCall | ||
| | stringOrOperator | ||
| ; | ||
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| stringOrOperator | ||
| : QUESTION | AT | JSONPATH_PARAMS | STRING_LITERAL |NUMBER | BOOLEAN_LITERAL | ID | GT | LT | GTE | LTE | EQ | NEQ | ||
| | PLUS | MINUS | DIV | LPAREN | RPAREN | DOT | COMMA | COLON | WS | AND | OR | NOT | ASTERISK | ||
| ; | ||
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| functionCall | ||
| : ID LPAREN (expression (COMMA expression)*)? RPAREN functionCallSuffix? | ||
| ; | ||
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| functionCallSuffix | ||
| : DOT ID LPAREN (expression (COMMA expression)*)? RPAREN // Method chaining | ||
| | jsonPathExpression | ||
| ; |
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