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• Lexer

Lex-header-name

Lex a header name.

Signature

(lex-header-name parstate) → (mv erp hname span new-parstate)

Arguments

parstate — Guard (parstatep parstate).

Returns

hname — Type (header-namep hname).

span — Type (spanp span).

new-parstate — Type (parstatep new-parstate), given (parstatep parstate).

This is called when we expect a header name. We read the next character, which must be present. Then we read the two kinds of header names, based on whether the next character is greater-than or double quote. If it is neither, lexing fails.

Definitions and Theorems

Function: lex-header-name

(defun lex-header-name (parstate)
 (declare (xargs :stobjs (parstate)))
 (declare (xargs :guard (parstatep parstate)))
 (let ((__function__ 'lex-header-name))
  (declare (ignorable __function__))
  (b* (((reterr)
        (irr-header-name)
        (irr-span)
        parstate)
       ((erp char first-pos parstate)
        (read-char parstate)))
   (cond
    ((not char)
     (reterr-msg
      :where (position-to-msg first-pos)
      :expected
      "a greater-than ~
                             or a double quote"
      :found (char-to-msg char)))
    ((utf8-= char (char-code #\<))
     (b* (((erp hchars closing-angle-pos parstate)
           (lex-*-h-char parstate))
          (span (make-span :start first-pos
                           :end closing-angle-pos))
          ((unless hchars)
           (reterr-msg :where (position-to-msg closing-angle-pos)
                       :expected "one or more characters"
                       :found "none")))
       (retok (header-name-angles hchars)
              span parstate)))
    ((utf8-= char (char-code #\"))
     (b* (((erp qchars closing-dquote-pos parstate)
           (lex-*-q-char parstate))
          (span (make-span :start first-pos
                           :end closing-dquote-pos))
          ((unless qchars)
           (reterr-msg :where (position-to-msg closing-dquote-pos)
                       :expected "one or more characters"
                       :found "none")))
       (retok (header-name-quotes qchars)
              span parstate)))
    (t
     (reterr-msg
      :where (position-to-msg first-pos)
      :expected
      "a greater-than ~
                             or a double quote"
      :found (char-to-msg char)))))))

Theorem: header-namep-of-lex-header-name.hname

(defthm header-namep-of-lex-header-name.hname
  (b* (((mv acl2::?erp ?hname ?span ?new-parstate)
        (lex-header-name parstate)))
    (header-namep hname))
  :rule-classes :rewrite)

Theorem: spanp-of-lex-header-name.span

(defthm spanp-of-lex-header-name.span
  (b* (((mv acl2::?erp ?hname ?span ?new-parstate)
        (lex-header-name parstate)))
    (spanp span))
  :rule-classes :rewrite)

Theorem: parstatep-of-lex-header-name.new-parstate

(defthm parstatep-of-lex-header-name.new-parstate
  (implies (parstatep parstate)
           (b* (((mv acl2::?erp ?hname ?span ?new-parstate)
                 (lex-header-name parstate)))
             (parstatep new-parstate)))
  :rule-classes :rewrite)

Theorem: parsize-of-lex-header-name-uncond

(defthm parsize-of-lex-header-name-uncond
  (b* (((mv acl2::?erp ?hname ?span ?new-parstate)
        (lex-header-name parstate)))
    (<= (parsize new-parstate)
        (parsize parstate)))
  :rule-classes :linear)

Theorem: parsize-of-lex-header-name-cond

(defthm parsize-of-lex-header-name-cond
  (b* (((mv acl2::?erp ?hname ?span ?new-parstate)
        (lex-header-name parstate)))
    (implies (not erp)
             (<= (parsize new-parstate)
                 (1- (parsize parstate)))))
  :rule-classes :linear)