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emacs: dropped rest of now-unused JSON functionality
Notmuch cli provides all structured data previously provided in json format now in s-expression format, rendering all current json functionality obsolete.
This commit is contained in:
Tomi Ollila
David Bremner
parent
3553b0a288
commit
2bd374c91e
4 changed files with 3 additions and 271 deletions
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@ -23,7 +23,6 @@
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(require 'mm-view)
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(require 'mm-decode)
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(require 'json)
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(require 'cl)
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(defvar notmuch-command "notmuch"
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@ -258,7 +257,7 @@ the given type."
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parts))
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;; Helper for parts which are generally not included in the default
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;; JSON output.
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;; SEXP output.
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(defun notmuch-get-bodypart-internal (query part-number process-crypto)
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(let ((args '("show" "--format=raw"))
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(part-arg (format "--part=%s" part-number)))
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@ -559,271 +558,6 @@ status."
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(defvar notmuch-show-process-crypto nil)
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(make-variable-buffer-local 'notmuch-show-process-crypto)
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;; Incremental JSON parsing
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;; These two variables are internal variables to the parsing
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;; routines. They are always used buffer local but need to be declared
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;; globally to avoid compiler warnings.
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(defvar notmuch-json-parser nil
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"Internal incremental JSON parser object: local to the buffer being parsed.")
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(defvar notmuch-json-state nil
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"State of the internal JSON parser: local to the buffer being parsed.")
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(defun notmuch-json-create-parser (buffer)
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"Return a streaming JSON parser that consumes input from BUFFER.
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This parser is designed to read streaming JSON whose structure is
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known to the caller. Like a typical JSON parsing interface, it
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provides a function to read a complete JSON value from the input.
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However, it extends this with an additional function that
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requires the next value in the input to be a compound value and
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descends into it, allowing its elements to be read one at a time
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or further descended into. Both functions can return 'retry to
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indicate that not enough input is available.
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The parser always consumes input from BUFFER's point. Hence, the
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caller is allowed to delete and data before point and may
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resynchronize after an error by moving point."
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(list buffer
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;; Terminator stack: a stack of characters that indicate the
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;; end of the compound values enclosing point
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'()
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;; Next: One of
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;; * 'expect-value if the next token must be a value, but a
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;; value has not yet been reached
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;; * 'value if point is at the beginning of a value
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;; * 'expect-comma if the next token must be a comma
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'expect-value
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;; Allow terminator: non-nil if the next token may be a
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;; terminator
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nil
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;; Partial parse position: If state is 'value, a marker for
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;; the position of the partial parser or nil if no partial
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;; parsing has happened yet
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nil
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;; Partial parse state: If state is 'value, the current
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;; `parse-partial-sexp' state
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nil))
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(defmacro notmuch-json-buffer (jp) `(first ,jp))
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(defmacro notmuch-json-term-stack (jp) `(second ,jp))
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(defmacro notmuch-json-next (jp) `(third ,jp))
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(defmacro notmuch-json-allow-term (jp) `(fourth ,jp))
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(defmacro notmuch-json-partial-pos (jp) `(fifth ,jp))
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(defmacro notmuch-json-partial-state (jp) `(sixth ,jp))
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(defvar notmuch-json-syntax-table
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(let ((table (make-syntax-table)))
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;; The standard syntax table is what we need except that "." needs
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;; to have word syntax instead of punctuation syntax.
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(modify-syntax-entry ?. "w" table)
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table)
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"Syntax table used for incremental JSON parsing.")
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(defun notmuch-json-scan-to-value (jp)
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;; Helper function that consumes separators, terminators, and
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;; whitespace from point. Returns nil if it successfully reached
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;; the beginning of a value, 'end if it consumed a terminator, or
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;; 'retry if not enough input was available to reach a value. Upon
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;; nil return, (notmuch-json-next jp) is always 'value.
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(if (eq (notmuch-json-next jp) 'value)
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;; We're already at a value
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nil
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;; Drive the state toward 'expect-value
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(skip-chars-forward " \t\r\n")
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(or (when (eobp) 'retry)
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;; Test for the terminator for the current compound
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(when (and (notmuch-json-allow-term jp)
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(eq (char-after) (car (notmuch-json-term-stack jp))))
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;; Consume it and expect a comma or terminator next
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(forward-char)
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(setf (notmuch-json-term-stack jp) (cdr (notmuch-json-term-stack jp))
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(notmuch-json-next jp) 'expect-comma
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(notmuch-json-allow-term jp) t)
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'end)
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;; Test for a separator
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(when (eq (notmuch-json-next jp) 'expect-comma)
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(when (/= (char-after) ?,)
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(signal 'json-readtable-error (list "expected ','")))
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;; Consume it, switch to 'expect-value, and disallow a
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;; terminator
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(forward-char)
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(skip-chars-forward " \t\r\n")
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(setf (notmuch-json-next jp) 'expect-value
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(notmuch-json-allow-term jp) nil)
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;; We moved point, so test for eobp again and fall through
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;; to the next test if there's more input
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(when (eobp) 'retry))
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;; Next must be 'expect-value and we know this isn't
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;; whitespace, EOB, or a terminator, so point must be on a
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;; value
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(progn
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(assert (eq (notmuch-json-next jp) 'expect-value))
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(setf (notmuch-json-next jp) 'value)
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nil))))
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(defun notmuch-json-begin-compound (jp)
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"Parse the beginning of a compound value and traverse inside it.
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Returns 'retry if there is insufficient input to parse the
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beginning of the compound. If this is able to parse the
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beginning of a compound, it moves point past the token that opens
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the compound and returns t. Later calls to `notmuch-json-read'
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will return the compound's elements.
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Entering JSON objects is currently unimplemented."
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(with-current-buffer (notmuch-json-buffer jp)
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;; Disallow terminators
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(setf (notmuch-json-allow-term jp) nil)
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;; Save "next" so we can restore it if there's a syntax error
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(let ((saved-next (notmuch-json-next jp)))
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(or (notmuch-json-scan-to-value jp)
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(if (/= (char-after) ?\[)
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(progn
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(setf (notmuch-json-next jp) saved-next)
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(signal 'json-readtable-error (list "expected '['")))
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(forward-char)
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(push ?\] (notmuch-json-term-stack jp))
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;; Expect a value or terminator next
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(setf (notmuch-json-next jp) 'expect-value
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(notmuch-json-allow-term jp) t)
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t)))))
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(defun notmuch-json-read (jp)
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"Parse the value at point in JP's buffer.
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Returns 'retry if there is insufficient input to parse a complete
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JSON value (though it may still move point over separators or
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whitespace). If the parser is currently inside a compound value
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and the next token ends the list or object, this moves point just
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past the terminator and returns 'end. Otherwise, this moves
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point to just past the end of the value and returns the value."
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(with-current-buffer (notmuch-json-buffer jp)
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(or
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;; Get to a value state
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(notmuch-json-scan-to-value jp)
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;; Can we parse a complete value?
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(let ((complete
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(if (looking-at "[-+0-9tfn]")
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;; This is a number or a keyword, so the partial
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;; parser isn't going to help us because a truncated
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;; number or keyword looks like a complete symbol to
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;; it. Look for something that clearly ends it.
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(save-excursion
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(skip-chars-forward "^]},: \t\r\n")
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(not (eobp)))
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;; We're looking at a string, object, or array, which we
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;; can partial parse. If we just reached the value, set
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;; up the partial parser.
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(when (null (notmuch-json-partial-state jp))
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(setf (notmuch-json-partial-pos jp) (point-marker)))
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;; Extend the partial parse until we either reach EOB or
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;; get the whole value
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(save-excursion
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(let ((pstate
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(with-syntax-table notmuch-json-syntax-table
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(parse-partial-sexp
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(notmuch-json-partial-pos jp) (point-max) 0 nil
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(notmuch-json-partial-state jp)))))
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;; A complete value is available if we've reached
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;; depth 0 or less and encountered a complete
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;; subexpression.
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(if (and (<= (first pstate) 0) (third pstate))
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t
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;; Not complete. Update the partial parser state
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(setf (notmuch-json-partial-pos jp) (point-marker)
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(notmuch-json-partial-state jp) pstate)
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nil))))))
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(if (not complete)
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'retry
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;; We have a value. Reset the partial parse state and expect
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;; a comma or terminator after the value.
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(setf (notmuch-json-next jp) 'expect-comma
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(notmuch-json-allow-term jp) t
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(notmuch-json-partial-pos jp) nil
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(notmuch-json-partial-state jp) nil)
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;; Parse the value
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(let ((json-object-type 'plist)
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(json-array-type 'list)
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(json-false nil))
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(json-read)))))))
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(defun notmuch-json-eof (jp)
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"Signal a json-error if there is more data in JP's buffer.
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Moves point to the beginning of any trailing data or to the end
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of the buffer if there is only trailing whitespace."
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(with-current-buffer (notmuch-json-buffer jp)
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(skip-chars-forward " \t\r\n")
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(unless (eobp)
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(signal 'json-error (list "Trailing garbage following JSON data")))))
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(defun notmuch-json-parse-partial-list (result-function error-function results-buf)
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"Parse a partial JSON list from current buffer.
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This function consumes a JSON list from the current buffer,
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applying RESULT-FUNCTION in buffer RESULT-BUFFER to each complete
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value in the list. It operates incrementally and should be
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called whenever the buffer has been extended with additional
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data.
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If there is a syntax error, this will attempt to resynchronize
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with the input and will apply ERROR-FUNCTION in buffer
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RESULT-BUFFER to any input that was skipped.
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It sets up all the needed internal variables: the caller just
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needs to call it with point in the same place that the parser
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left it."
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(let (done)
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(unless (local-variable-p 'notmuch-json-parser)
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(set (make-local-variable 'notmuch-json-parser)
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(notmuch-json-create-parser (current-buffer)))
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(set (make-local-variable 'notmuch-json-state) 'begin))
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(while (not done)
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(condition-case nil
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(case notmuch-json-state
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((begin)
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;; Enter the results list
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(if (eq (notmuch-json-begin-compound
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notmuch-json-parser) 'retry)
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(setq done t)
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(setq notmuch-json-state 'result)))
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((result)
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;; Parse a result
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(let ((result (notmuch-json-read notmuch-json-parser)))
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(case result
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((retry) (setq done t))
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((end) (setq notmuch-json-state 'end))
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(otherwise (with-current-buffer results-buf
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(funcall result-function result))))))
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((end)
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;; Any trailing data is unexpected
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(notmuch-json-eof notmuch-json-parser)
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(setq done t)))
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(json-error
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;; Do our best to resynchronize and ensure forward
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;; progress
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(let ((bad (buffer-substring (line-beginning-position)
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(line-end-position))))
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(forward-line)
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(with-current-buffer results-buf
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(funcall error-function "%s" bad))))))
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;; Clear out what we've parsed
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(delete-region (point-min) (point))))
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(provide 'notmuch-lib)
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@ -19,7 +19,6 @@
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;;
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;; Authors: David Edmondson <dme@dme.org>
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(require 'json)
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(require 'message)
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(require 'mm-view)
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(require 'format-spec)
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@ -157,7 +156,7 @@ list."
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(setq args (append args '("--reply-to=sender"))))
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(setq args (append args (list query-string)))
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;; Get the reply object as JSON, and parse it into an elisp object.
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;; Get the reply object as SEXP, and parse it into an elisp object.
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(setq reply (apply #'notmuch-call-notmuch-sexp args))
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;; Extract the original message to simplify the following code.
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@ -20,7 +20,6 @@
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;; Authors: David Bremner <david@tethera.net>
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(require 'notmuch-lib)
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(require 'json)
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(defun notmuch-query-get-threads (search-terms)
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"Return a list of threads of messages matching SEARCH-TERMS.
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@ -2042,7 +2042,7 @@ the user (see `notmuch-show-stash-mlarchive-link-alist')."
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(with-current-buffer buf
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(setq notmuch-show-process-crypto process-crypto)
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;; Always acquires the part via `notmuch part', even if it is
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;; available in the JSON output.
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;; available in the SEXP output.
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(insert (notmuch-get-bodypart-internal message-id nth notmuch-show-process-crypto)))
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buf))
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