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• Parser

Parse-leave-statement

Attempts to eat a "leave" keyword and build a statement AST node of kind :leave.

Signature

(parse-leave-statement tokens) 
  → 
(mv result-ast tokens-after-statement)

Arguments

tokens — Guard (abnf::tree-listp tokens).

Returns

result-ast — Type (statement-resultp result-ast).

tokens-after-statement — Type (abnf::tree-listp tokens-after-statement).

Definitions and Theorems

Function: parse-leave-statement

(defun parse-leave-statement (tokens)
  (declare (xargs :guard (abnf::tree-listp tokens)))
  (let ((__function__ 'parse-leave-statement))
    (declare (ignorable __function__))
    (b* (((mv statement-or-nil tokens-after-statement)
          (parse-keyword "leave" tokens)))
      (if (or (not (statementp statement-or-nil))
              (reserrp tokens-after-statement))
          (mv (reserrf "no leave statement here")
              (abnf::tree-list-fix tokens))
        (mv statement-or-nil
            (abnf::tree-list-fix tokens-after-statement))))))

Theorem: statement-resultp-of-parse-leave-statement.result-ast

(defthm statement-resultp-of-parse-leave-statement.result-ast
  (b* (((mv ?result-ast ?tokens-after-statement)
        (parse-leave-statement tokens)))
    (statement-resultp result-ast))
  :rule-classes :rewrite)

Theorem: tree-listp-of-parse-leave-statement.tokens-after-statement

(defthm tree-listp-of-parse-leave-statement.tokens-after-statement
  (b* (((mv ?result-ast ?tokens-after-statement)
        (parse-leave-statement tokens)))
    (abnf::tree-listp tokens-after-statement))
  :rule-classes :rewrite)

Theorem: len-of-parse-leave-statement-<

(defthm len-of-parse-leave-statement-<
  (b* (((mv ?result-ast ?tokens-after-statement)
        (parse-leave-statement tokens)))
    (implies (not (reserrp result-ast))
             (< (len tokens-after-statement)
                (len tokens))))
  :rule-classes :linear)