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|
grammar CGrammar;
options {
contextSuperClass = Q1.Compiler.Context;
}
ID: [a-zA-Z_][a-zA-Z0-9_]*;
INT: [0-9]+;
WS: [ \t\r\n]+ -> skip;
COMMENT: '//' .*? ([\n] | EOF) -> channel(HIDDEN);
program
: function+ EOF
;
function
: 'int' name=ID '(' ( types+='int' params+=ID (',' types+='int' params+=ID )* )? ')' ';' #functionPrototype
| 'int' name=ID '(' ( types+='int' params+=ID (',' types+='int' params+=ID )* )? ')' block #functionDefinition
;
block
: '{' block_item* '}'
;
block_item
: statement
| declaration
;
statement
: 'return' expression ';' #returnStatement
| 'if' '(' expression ')' then=statement ('else' else=statement)? #ifStatement
| 'for' '(' (initializer=expression)? ';' cond=expression? ';' post=expression? ')' body=statement #forExprStatement
| 'for' '(' initializer=declaration cond=expression? ';' post=expression? ')' body=statement #forDeclStatement
| 'while' '(' cond=expression ')' body=statement #whileStatement
| 'do' body=statement 'while' '(' cond=expression ')' ';' #doWhileStatement
| 'break' ';' #breakStatement
| 'continue' ';' #continueStatement
| expression ';' #expressionStatement
| block #blockStatement
| ';' #nullStatement
;
declaration
: 'int' name=ID ('=' value=expression)? ';' #variableDeclaration
;
expression
: '(' expression ')' #parenthesizedExpression
// | left=expression ',' right=expression #commaExpression
| constant #constantExpression
| target '=' expression #assignmentExpression
| ID #variableExpression
| ID '(' ( params+=expression (',' params+=expression )* )? ')' #callExpression
| '!' expression #notExpression
| '~' expression #invertExpression
| '++' target #incrementPrefixExpression
| '--' target #decrementPrefixExpression
| target '++' #incrementPostfixExpression
| target '--' #decrementPostfixExpression
| left=expression '*' right=expression #multiplyExpression
| left=expression '/' right=expression #divideExpression
| left=expression '%' right=expression #modulusExpression
| left=expression '+' right=expression #addExpression
| left=expression '-' right=expression #subtractExpression
| left=expression '<' right=expression #lessThanExpression
| left=expression '>' right=expression #greaterThanExpression
| left=expression '<=' right=expression #lessThanOrEqualExpression
| left=expression '>=' right=expression #greaterThanOrEqualExpression
| left=expression '==' right=expression #equalExpression
| left=expression '!=' right=expression #notEqualExpression
| left=expression '&' right=expression #bitwiseAndExpression
| left=expression '|' right=expression #bitwiseOrExpression
| left=expression '^' right=expression #bitwiseXorExpression
| left=expression '<<' right=expression #bitwiseLeftShiftExpression
| left=expression '>>' right=expression #bitwiseRightShiftExpression
| left=expression '&&' right=expression #logicalAndExpression
| left=expression '||' right=expression #logicalOrExpression
| target '*=' expression #compoundMultiplyExpression
| target '/=' expression #compoundDivideExpression
| target '%=' expression #compoundModulusExpression
| target '+=' expression #compoundAddExpression
| target '-=' expression #compoundSubtractExpression
| target '&=' expression #compoundBitwiseAndExpression
| target '|=' expression #compoundBitwiseOrExpression
| target '^=' expression #compoundBitwiseXorExpression
| target '<<=' expression #compoundBitwiseLeftShiftExpression
| target '>>=' expression #compoundBitwiseRightShiftExpression
| cond=expression '?' then=expression ':' else=expression #ternaryExpression
;
constant
: INT # intConstant
;
target
: ID # variableTarget
;
|
