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i need a n example on flex and bison , so i can learn how to build ast tree and symbol table and do semantic analysis
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Flex and Bison are tools for building programs that handle structured input. They were originally tools for building compilers, but they have proven to be useful in many other areas.
Flex and Bison are two separate software. Even though they are designed to work together there are compatibility issues and incompatible features. For example, Bison supports the generation of parser in C, C++ and Java, while Flex only supports C well.
If there were a useful semantic value associated with the `+' token, it could be referred to as $2 . If you don't specify an action for a rule, Bison supplies a default: $$ = $1 . Thus, the value of the first symbol in the rule becomes the value of the whole rule.
This link: Using Flex and Bison is really good. It describes how they work and afterwards explains step-by-step how to build a small programming language.
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PostgreSQL: http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/
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