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Chapter 3
`awk.ss`: Awk-like Syntax

This library defines the `awk` macro from Scsh:

    (awk next-record-expr
         (record field-variable ···)
         counter-variable/optional
         ((state-variable init-expr) ···)
         continue-variable/optional
      clause ···)

    counter-variable/optional is either empty or
      variable

    continue-variable/optional is either empty or
      variable

    clause is one of
      (test body-expr ···1)
      (test => procedure-expr)
      (/ regexp-str / (variable-or-false ···1) body-expr ···1)
      (range exclusive-start-test exclusive-stop-test body-expr ···1)
      (:range inclusive-start-test exclusive-stop-test body-expr ···1)
      (range: exclusive-start-test inclusive-stop-test body-expr ···1)
      (:range: inclusive-start-test inclusive-inclusive-stop-test body-expr ···1)
      (else body-expr ···1)
      (after body-expr ···1)

    test is one of
      integer
      regexp-str
      expr

    variable-or-false is one of
      variable
      #f

For detailed information about `awk`, see Olin Shivers's Scsh Reference Manual. In addition to `awk`, the Scsh-compatible procedures `match:start`, `match:end`, `match:substring`, and `regexp-exec` are defined. These `match:` procedures must be used to extract match information in a regular expression clause when using the `=>` form.