yacc Grammar Syntax

Present Terminals

• yacc ID
• INT
• VAR

Grammar Rules

For a grammar like: $\alpha \to {\beta }_1{\beta }_2\dots {\beta }_k$ with:

• $\alpha$ as a non-terminal
• ${\beta }_i$ as a non-terminal or terminal

expr := INT
  { $$ = new IntegerLiteral(@1, $1); };

• First line is the grammar rule, where we produce an int token
• $$ is the result of the production rule
• @1 is the source location of $\beta$
• $1 is the value of ${\beta }_1$, here INT