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;; a pinyin input method for zero-framework
;;==============
;; dependencies
;;==============
(require 's)
(require 'zero-framework)
;;===============================
;; basic data and emacs facility
;;===============================
(defvar zero-pinyin-state nil "zero-pinyin internal state. could be nil or `*zero-pinyin-state-im-partial-commit*'")
(defconst *zero-pinyin-state-im-partial-commit* 'IM-PARTIAL-COMMIT)
(defvar zero-pinyin-used-preedit-str-lengths nil
"accompany `zero-candidates', marks how many preedit-str chars are used for each candidate")
(defvar zero-pinyin-pending-str "")
(defvar zero-pinyin-pending-preedit-str "")
;;=====================
;; key logic functions
;;=====================
(defun zero-pinyin-reset ()
(setq zero-pinyin-state nil)
(setq zero-pinyin-used-preedit-str-lengths nil)
(setq zero-pinyin-pending-str "")
(setq zero-pinyin-pending-preedit-str ""))
(defun zero-pinyin-init ()
(make-local-variable 'zero-pinyin-state)
(zero-pinyin-reset))
(defun zero-pinyin-build-candidates (preedit-str)
(zero-pinyin-build-candidates-test preedit-str))
;; (defun zero-pinyin-build-candidates-async (preedit-str)
;; "build candidate list, when done show it via `zero-pinyin-show-candidates'"
;; (zero-pinyin-debug "building candidate list\n")
;; (let ((candidates (zero-pinyin-build-candidates preedit-str)))
;; ;; update cache to make SPC and digit key selection possible.
;; (setq zero-pinyin-candidates candidates)
;; (zero-pinyin-show-candidates candidates)))
(defun zero-pinyin-can-start-sequence (ch)
"return t if char ch can start a preedit sequence."
(and (>= ch ?a)
(<= ch ?z)
(not (= ch ?u))
(not (= ch ?v))))
(ert-deftest zero-pinyin-can-start-sequence ()
(should (zero-pinyin-can-start-sequence ?a))
(should (zero-pinyin-can-start-sequence ?l))
(should (zero-pinyin-can-start-sequence ?m))
(should (zero-pinyin-can-start-sequence ?z))
(should-not (zero-pinyin-can-start-sequence ?1))
(should-not (zero-pinyin-can-start-sequence ?.))
(should-not (zero-pinyin-can-start-sequence ?u))
(should-not (zero-pinyin-can-start-sequence ?v)))
(defun zero-pinyin-pending-preedit-str-changed ()
(zero-build-candidates-async zero-pinyin-pending-preedit-str))
(defun zero-pinyin-commit-nth-candidate (n)
"commit nth candidate and return true if it exists, otherwise, return false"
(let* ((candidate (nth n (zero-candidates-on-page zero-candidates)))
(used-len (when candidate
(nth (+ n (* zero-candidates-per-page zero-current-page)) zero-pinyin-used-preedit-str-lengths))))
(when candidate
(zero-debug
"zero-pinyin-commit-nth-candidate n=%s candidate=%s used-len=%s zero-pinyin-pending-preedit-str=%s\n"
n candidate used-len zero-pinyin-pending-preedit-str)
(cond
((null zero-pinyin-state)
(if (= used-len (length zero-preedit-str))
(progn
(zero-debug "commit in full\n")
(zero-set-state *zero-state-im-waiting-input*)
(zero-commit-text candidate)
t)
(zero-debug "partial commit, in partial commit mode now.\n")
(setq zero-pinyin-state *zero-pinyin-state-im-partial-commit*)
(setq zero-pinyin-pending-str candidate)
(setq zero-pinyin-pending-preedit-str (substring zero-preedit-str used-len))
(zero-pinyin-pending-preedit-str-changed)
t))
((eq zero-pinyin-state *zero-pinyin-state-im-partial-commit*)
(if (= used-len (length zero-pinyin-pending-preedit-str))
(progn
(zero-debug "finishes partial commit\n")
(setq zero-pinyin-state nil)
(zero-set-state *zero-state-im-waiting-input*)
(zero-commit-text (concat zero-pinyin-pending-str candidate))
t)
(zero-debug "continue partial commit\n")
(setq zero-pinyin-pending-str (concat zero-pinyin-pending-str candidate))
(setq zero-pinyin-pending-preedit-str (substring zero-pinyin-pending-preedit-str used-len))
(zero-pinyin-pending-preedit-str-changed)
t))
(t (error "unexpected zero-pinyin-state: %s" zero-pinyin-state))))))
(defun zero-pinyin-commit-first-candidate-or-preedit-str ()
(unless (zero-pinyin-commit-nth-candidate 0)
(zero-commit-preedit-str)))
(defun zero-pinyin-commit-first-candidate-in-full ()
"commit first candidate and return t if first candidate consumes all preedit-str.
otherwise, just return nil"
(let ((candidate (nth 0 (zero-candidates-on-page zero-candidates)))
(used-len (nth (* zero-candidates-per-page zero-current-page) zero-pinyin-used-preedit-str-lengths)))
(when candidate
(cond
((null zero-pinyin-state)
(when (= used-len (length zero-preedit-str))
(zero-set-state *zero-state-im-waiting-input*)
(zero-commit-text candidate)
t))
((eq zero-pinyin-state *zero-pinyin-state-im-partial-commit*)
(when (= used-len (length zero-pinyin-pending-preedit-str))
(setq zero-pinyin-state nil)
(zero-set-state *zero-state-im-waiting-input*)
(zero-commit-text (concat zero-pinyin-pending-str candidate))
t))
(t (error "unexpected zero-pinyin-state: %s" zero-pinyin-state))))))
(defun zero-pinyin-handle-preedit-char (ch)
"handle IM-PREEDITING state char insert. overrides `zero-handle-preedit-char-default'"
(zero-pinyin-commit-first-candidate-or-preedit-str))
((and (>= ch ?0) (<= ch ?9))
;; 1 commit the 0th candidate
;; 2 commit the 1st candidate
;; ...
;; 0 commit the 9th candidate
(unless (zero-pinyin-commit-nth-candidate (mod (- (- ch ?0) 1) 10))
(zero-append-char-to-preedit-str ch)
(setq zero-pinyin-state nil)))
((or (= ch zero-previous-page-key)
(= ch zero-next-page-key))
(zero-handle-preedit-char-default ch))
(t (let ((str (zero-convert-punctuation ch)))
(if str
(when (zero-pinyin-commit-first-candidate-in-full)
(zero-set-state *zero-state-im-waiting-input*)
(insert str))
(zero-append-char-to-preedit-str ch))))))
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(defun zero-pinyin-get-preedit-str-for-panel ()
(if (eq zero-pinyin-state *zero-pinyin-state-im-partial-commit*)
(concat zero-pinyin-pending-str zero-pinyin-pending-preedit-str)
zero-preedit-str))
(defun zero-pinyin-backspace ()
"handle backspace key in `*zero-state-im-preediting*' state"
(if (eq zero-pinyin-state *zero-pinyin-state-im-partial-commit*)
(progn
;; start over for candidate selection process.
(setq zero-pinyin-state nil)
(zero-preedit-str-changed))
(zero-backspace-default)))
;;===============================
;; register IM to zero framework
;;===============================
(zero-register-im
'pinyin
'((:build-candidates . zero-pinyin-build-candidates)
(:can-start-sequence . zero-pinyin-can-start-sequence)
(:handle-preedit-char . zero-pinyin-handle-preedit-char)
(:get-preedit-str-for-panel . zero-pinyin-get-preedit-str-for-panel)
(:handle-backspace . zero-pinyin-backspace)
(:init . zero-pinyin-init)))
;;============
;; public API
;;============
;;===========
;; test data
;;===========
(defun zero-pinyin-build-candidates-test (preedit-str)
"test data for testing partial commit"
(cond
((equal preedit-str "liyifeng")
(setq zero-pinyin-used-preedit-str-lengths '(8 4 4 4 2 2 2))
'("李易峰" "利益" "礼仪" "离异" "里" "理" "力"))
((equal preedit-str "feng")
(setq zero-pinyin-used-preedit-str-lengths '(4 4 4 4 4))
'("风" "封" "疯" "丰" "凤"))
((equal preedit-str "yifeng")
(setq zero-pinyin-used-preedit-str-lengths '(6 6 2 2 2 2))
'("一封" "遗风" "艺" "依" "一" "以"))
(t nil)))
(provide 'zero-pinyin)