(bison.info) How Precedence

 
 How Precedence Works
 --------------------
 
    The first effect of the precedence declarations is to assign
 precedence levels to the terminal symbols declared.  The second effect
 is to assign precedence levels to certain rules: each rule gets its
 precedence from the last terminal symbol mentioned in the components.
 (You can also specify explicitly the precedence of a rule.  
 Context-Dependent Precedence Contextual Precedence.)
 
    Finally, the resolution of conflicts works by comparing the
 precedence of the rule being considered with that of the look-ahead
 token.  If the token's precedence is higher, the choice is to shift.
 If the rule's precedence is higher, the choice is to reduce.  If they
 have equal precedence, the choice is made based on the associativity of
 that precedence level.  The verbose output file made by `-v' (
 Invoking Bison Invocation.) says how each conflict was resolved.
 
    Not all rules and not all tokens have precedence.  If either the
 rule or the look-ahead token has no precedence, then the default is to
 shift.

Info Catalog

(bison.info) Precedence Examples

(bison.info) Precedence

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