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# Syntax (old)
### Top-level elements
```PEG
FunctionDeclaration ← FunctionSignature ';'
FunctionDefinition ← FunctionSignature Block
FunctionSignature ← Type identifier '(' SignatureArguments? ')'
SignatureArguments ← Type identifier ',' SignatureArguments /
Type identifier ','?
```
### Statements
```PEG
Block ← '{' Statement* '}'
Statement ← VariableDefinition /
VariableDeclaration /
IfStatement /
SwitchStatement /
WhileStatement /
DoWhileStatement /
ForStatement /
FlowControlStatement /
AssignmentStatement /
ExpressionStatement
VariableDefinition ← Type identifier '=' Expression ';'
VariableDeclaration ← Type identifier ';'
IfStatement ← 'if' Expression Block 'else' Block /
'if' Expression Block
SwitchStatement ← 'switch' Expression '{' SwitchCase+ '}'
SwitchCase ← CaseSpecifier Block /
'default' Block
CaseSpecifier ← 'case' Expression ',' CaseSpecifier /
'case' Expression ','?
WhileStatement ← 'while' Expression Block
DoWhileStatement ← 'do' Block 'while' Expression ';'
ForStatement ← 'for' VariableDefinition? ';' Expression ';' AssignmentStatementBody? Block
FlowControlStatement ← 'continue' ';' /
'break' ';' /
'return' Expression? ';'
AssignmentStatement ← AssignmentStatementBody ';'
AssignmentStatementBody ← AssignmentTargetExpression '=' Expression /
AssignmentTargetExpression '+=' Expression /
AssignmentTargetExpression '-=' Expression /
AssignmentTargetExpression '*=' Expression /
AssignmentTargetExpression '/=' Expression /
AssignmentTargetExpression '%=' Expression /
AssignmentTargetExpression '&=' Expression /
AssignmentTargetExpression '^=' Expression /
AssignmentTargetExpression '|=' Expression /
AssignmentTargetExpression '++' /
AssignmentTargetExpression '--'
ExpressionStatement ← Expression ';'
```
### Types
```PEG
Type ← 'const' BasicType /
BasicType '*' /
BasicType '[' Expression ']' /
BasicType 'function' '(' (BasicType ',')* ')' /
BasicType
BasicType ← 'void' /
IntegerType /
'signed' IntegerType /
'unsigned' IntegerType /
'float' /
'double' /
'bool' /
'struct' identifier /
'enum' identifier /
'typedef' identifier /
'(' Type ')'
IntegerType ← 'char' /
'short' /
'int' /
'long'
```
### Expressions
```PEG
AssignmentTargetExpression ← identifier ATEElementSuffix*
ATEElementSuffix ← '[' Expression ']' /
'.' identifier /
'->' identifier
AtomicExpression ← identifier /
constant /
string-literal /
'(' Expression ')'
ObjectExpression ← AtomicExpression ObjectSuffix* /
ArrayLiteralExpression /
StructLiteralExpression
ObjectSuffix ← '[' Expression ']' /
'(' CommasExpressionList? ')' /
'.' identifier /
'->' identifier
CommasExpressionList ← Expression ',' CommasExpressionList? /
Expression ','?
ArrayLiteralExpression ← '{' CommasExpressionList '}'
StructLiteralExpression ← '{' StructLiteralBody '}'
StructLiteralBody ← StructLiteralElement ',' StructLiteralBody? /
StructLiteralElement ','?
StructLiteralElement ← '.' identifier '=' Expression
FactorExpression ← '(' Type ')' FactorExpression /
'&' FactorExpression /
'*' FactorExpression /
'+' FactorExpression /
'-' FactorExpression /
'~' FactorExpression /
'!' FactorExpression /
'sizeof' FactorExpression /
'sizeof' Type /
ObjectExpression
TermExpression ← FactorExpression TermSuffix*
TermSuffix ← '*' FactorExpression /
'/' FactorExpression /
'%' FactorExpression
ArithmeticExpression ← TermExpression ArithmeticSuffix*
ArithmeticSuffix ← '+' TermExpression /
'-' TermExpression
BitwiseOpExpression ← ArithmeticExpression '<<' ArithmeticExpression /
ArithmeticExpression '>>' ArithmeticExpression /
ArithmeticExpression '^' ArithmeticExpression /
ArithmeticExpression ('&' ArithmeticExpression)+ /
ArithmeticExpression ('|' ArithmeticExpression)+ /
ArithmeticExpression
ComparisonExpression ← BitwiseOpExpression '==' BitwiseOpExpression /
BitwiseOpExpression '!=' BitwiseOpExpression /
BitwiseOpExpression '<=' BitwiseOpExpression /
BitwiseOpExpression '>=' BitwiseOpExpression /
BitwiseOpExpression '<' BitwiseOpExpression /
BitwiseOpExpression '>' BitwiseOpExpression /
BitwiseOpExpression
Expression ← ComparisonExpression ('&&' ComparisonExpression)+ /
ComparisonExpression ('||' ComparisonExpression)+ /
ComparisonExpression
```
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