branch: elpa/teco
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Author: Mark T. Kennedy <m...@acm.org>
Commit: Mark T. Kennedy <m...@acm.org>
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+# teco
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+;;; teco.el --- Dale Worley's teco-in-elisp interpreter
+
+;; -*-byte-compile-dynamic-docstrings: nil;-*-
+;;; Commentary
+;;; Teco interpreter for Gnu Emacs, version 7.
+
+;; LCD Archive Entry:
+;; teco|Dale R. Worley|wor...@alum.mit.edu
+;; |Teco interpreter
+;; |96-09-02|version 7|~/packages/teco.el.Z
+
+;; This code has been tested some, but no doubt contains a zillion bugs.
+;; You have been warned.
+
+;; Some byte-compilers will not compile the function definitions for the
+;; Teco commands because the defuns are created by macros. If you have this
+;; problem, I can send you the byte-compiled version.
+
+;; Written by Dale R. Worley based on a C implementation by Matt Fichtenbaum.
+;; Please send comments, bug fixes, enhancements, etc. to wor...@alum.mit.edu.
+
+;; WARRANTY DISCLAIMER
+
+;; This software was created by Dale R. Worley and is
+;; distributed free of charge. It is placed in the public domain and
+;; permission is granted to anyone to use, duplicate, modify and redistribute
+;; it provided that this notice is attached.
+
+;; Dale R. Worley provides absolutely NO WARRANTY OF ANY KIND
+;; with respect to this software. The entire risk as to the quality and
+;; performance of this software is with the user. IN NO EVENT WILL DALE R.
+;; WORLEY BE LIABLE TO ANYONE FOR ANY DAMAGES ARISING OUT THE
+;; USE OF THIS SOFTWARE, INCLUDING, WITHOUT LIMITATION, DAMAGES RESULTING FROM
+;; LOST DATA OR LOST PROFITS, OR FOR ANY SPECIAL, INCIDENTAL OR CONSEQUENTIAL
+;; DAMAGES.
+
+;; Since much of this code is translated from the C version by
+;; Matt Fichtenbaum, I include his copyright notice:
+;; TECO for Ultrix. Copyright 1986 Matt Fichtenbaum.
+;; This program and its components belong to GenRad Inc, Concord MA 01742.
+;; They may be copied if this copyright notice is included.
+
+;; Change log:
+
+;; Version 1
+;; Original implementation
+
+;; Version 2
+;; Fix bugs found by Alan Katz in S.
+
+;; Version 3
+;; Fix bugs found by Lum Johnson in key-binding code.
+;; Fix handling of ^C, ^G, and ^L in command input.
+;; Fix <...> so it iterates indefinitely. (Found by Mark Henderson.)
+;; Fix ; so it exits from iterations correctly.
+;; Add FR and FS commands.
+;; Make commands that are supposed to set ^S do so.
+;; Make flow-control commands clear the @-flag, so the @-flag can be
+;; statically predicted during skipping of code.
+;; Set up immediate-action commands ?, /, and *q.
+
+;; Version 4
+;; The T, D, and K commands weren't clearing their arguments.
+;; Since ! is a flow-control command (O can go to it), it must clear the
+;; @-flag.
+
+;; Version 5
+;; Fix bug found by k...@kelp.boston.ma.us in teco:output, causing trace output
+;; to generate errors. It also caused =, ==, and === operators to generate
+;; errors.
+;; Put in improved disclaimer of copyright and warranty.
+;; Added teco:version variable and function.
+
+;; Version 6
+;; Add attribution to "Philosophy".
+;; Fix handling of negative arguments to S. (Fix due to Bill Freeman.)
+;; Fix order of arguments produced by ^Y. (Fix due to Bill Freeman.)
+;; Add ES flag to control placement of cursor after reverse searches.
+;; (because different Tecos handle cursor placement differently)
+;; Altered expression computation so that "-" alone yields -1 as a value.
+;; (useful for -Sabc$)
+;; Add n,mL command, mostly for use with FW.
+;; Add FL and FW commands.
+;; Add FR and FS to list of commands.
+;; Add FE to execute Emacs lisp code.
+;; Add teco:copy-to-q-reg to make loading q-regs easier.
+;; Function 'teco' added as alias for 'teco:command', to make invocation with
+;; M-x easier.
+;; Fix an assortment of bugs and bad coding found by k...@kelp.boston.ma.us.
+
+;; Version 7
+;; Changed construction of teco:command-keymap to work in Emacs 19.30.
+;; (This may be non-compatible with Emacs 18.)
+;; Fixed minor bugs revealed by byte-compile.
+
+;; Version 8
+;; Change `last-command-char' to new `last-command-event'.
+;; Fixed some bugs revealed by byte-compile.
+;; Added support for evil, try to add the ability to remap
+;; teco:command-escape, which is one of the original feature
+;; of TECO.
+
+;; To be able to invoke Teco directly, do:
+;; (global-set-key "\C-z" 'teco:command)
+;; ; or whatever key binding you want
+;; (autoload 'teco:command "teco"
+;; "Read and execute a Teco command string."
+;; t nil)
+;; (autoload 'teco "teco"
+;; "Read and execute a Teco command string."
+;; t nil)
+;; ; 'teco' is an alias for 'teco:command'
+;; This can be useful for loading q-regs from an Emacs buffer:
+;; (global-set-key "\C-xy" 'teco:copy-to-q-reg)
+;; ; or whatever key binding you want
+;; (autoload 'teco:copy-to-q-reg "teco"
+;; "Copy region into Teco q-reg REG."
+;; t nil)
+
+;; Differences from other Tecos:
+;; Character positions in the buffer are numbered in the Emacs way: The first
+;; character is numbered 1 (or (point-min) if narrowing is in effect). The
+;; B command returns that number.
+;; Ends of lines are represented by a single character (newline), so C and R
+;; skip over them, rather than 2C and 2R.
+;; All file I/O is left to the underlying Emacs. Thus, almost all Ex commands
+;; are omitted.
+;; Immediate action commands are ?, /, and *q.
+
+;; Command set:
+;; NUL Not a command.
+;; ^A Output message to terminal (argument ends with ^A)
+;; ^C Exit macro
+;; ^C^C Stop execution
+;; ^C (type-in) abort command
+;; ^D Set radix to decimal
+;; ^EA (match char) Match alphabetics
+;; ^EC (match char) Match symbol constituents
+;; ^ED (match char) Match numerics
+;; ^EGq (match char) Match any char in q-reg
+;; ^EL (match char) Match line terminators
+;; ^EQq (string char) Use contents of q-reg
+;; ^ER (match char) Match alphanumerics
+;; ^ES (match char) Match non-null space/tab
+;; ^EV (match char) Match lower case alphabetic
+;; ^EW (match char) Match upper case alphabetic
+;; ^EX (match char) Match any char
+;; ^G (type-in) abort command
+;; TAB Insert tab and text
+;; LF Line terminator; Ignored in commands
+;; VT Ignored in commands
+;; FF Ignored in commands
+;; FF (type-in) redraw screen
+;; CR Ignored in commands
+;; ^Nx (match char) Match all but x
+;; ^O Set radix to octal
+;; ^Q Convert line argument into character argument
+;; ^Qx (string char) Use x literally
+;; n^R Set radix to n
+;; :^R Enter recursive edit
+;; ^S -(length of last referenced string)
+;; set by S, I, TAB, G, FR, FS, and \
+;; ^S (match char) match separator char
+;; ^T Ascii value of next character typed
+;; n^T Output Ascii character with value n
+;; ^U (type-in) Kill command line
+;; ^Uq Put text argument into q-reg
+;; n^Uq Put Ascii character 'n' into q-reg
+;; :^Uq Append text argument to q-reg
+;; n:^Uq Append character 'n' to q-reg
+;; ^X Set/get search mode flag
+;; ^X (match char) Match any character
+;; ^Y Equivalent to '.+^S,.'
+;; ^Z Not a Teco command
+;; ESC String terminator; absorbs arguments
+;; ESC ESC (type-in) End command
+;; ESC ESC Exit from macro
+;; ^\ Not a Teco command
+;; ^] Not a Teco command
+;; ^^x Ascii value of the character x
+;; ^_ One's complement (logical NOT)
+;; ! Define label (argument ends with !)
+;; " Start conditional
+;; n"< Test for less than zero
+;; n"> Test for greater than zero
+;; n"= Test for equal to zero
+;; n"A Test for alphabetic
+;; n"C Test for symbol constituent
+;; n"D Test for numeric
+;; n"E Test for equal to zero
+;; n"F Test for false
+;; n"G Test for greater than zero
+;; n"L Test for less than zero
+;; n"N Test for not equal to zero
+;; n"R Test for alphanumeric
+;; n"S Test for successful
+;; n"T Test for true
+;; n"U Test for unsuccessful
+;; n"V Test for lower case
+;; n"W Test for upper case
+;; # Logical OR
+;; $ Not a Teco command
+;; n%q Add n to q-reg and return result
+;; & Logical AND
+;; ' End conditional
+;; ( Expression grouping
+;; ) Expression grouping
+;; * Multiplication
+;; *q (immediate action) Copy last command into q-reg
+;; + Addition
+;; , Argument separator
+;; - Subtraction or negation
+;; . Current pointer position
+;; / Division
+;; / (immediate action) Insert last command into command buffer
+;; 0-9 Digit
+;; n< Iterate n times
+;; = Type in decimal
+;; := Type in decimal, no newline
+;; == Type in octal
+;; :== Type in octal, no newline
+;; === Type in hexadecimal
+;; :=== Type in hexadecimal, no newline
+;; :: Make next search a compare
+;; > End iteration
+;; ? Toggle tracing
+;; ? (immediate action) Insert command string or macro that reported
+;; last error, up to point of error, into command buffer
+;; n:A Get Ascii code of character at relative position n
+;; B Character position of beginning of buffer
+;; nC Advance n characters
+;; nD Delete n characters
+;; n,mD Delete characters between n and m
+;; ET Typeout control flag
+;; 8 no echo for ^T
+;; 32 no wait for ^T
+;; ES Search control flag
+;; 1 leave pointer at end of found string
+;; after reverse search, rather than at beginning
+;; FE Execute text argument as Emacs lisp. Uses string chars but
+;; not match chars, so FE^EQq$ executes contents of q-reg
+;; FL Searches right or left over balanced parenthesized strings,
+;; in the same way as FW searches over words
+;; Syntax is defined by Emacs' syntax table
+;; FR Replace string found by previous match with text argument
+;; FSaaa$bbb$
+;; Search for string aaa and replace it with bbb.
+;; nFW Return arguments .,x where x is the other side of the n-th
+;; word from point. Main uses: FWL moves right one word,
+;; -FWL moves left one word, FWK deletes one word to right,
+;; nFWXq puts n words into q-reg
+;; "word" is defined by Emacs' syntax table
+;; :FW Like FW, but goes to near side of the n-th word
+;; Gq Get string from q-reg into buffer
+;; :Gq Type out q-reg
+;; H Equivalent to 'B,Z'
+;; I Insert text argument
+;; nJ Move pointer to character n
+;; nK Kill n lines
+;; n,mK Kill characters between n and m
+;; nL Advance n lines
+;; n,mL Same as n+m-.J, mostly for use by FW
+;; Mq Execute string in q-reg
+;; O Goto label
+;; nO Go to n-th label in list (0-origin)
+;; Qq Number in q-reg
+;; nQq Ascii value of n-th character in q-reg
+;; :Qq Size of text in q-reg
+;; nR Back up n characters
+;; nS Search
+;; nT Type n lines
+;; n,mT Type chars from n to m
+;; nUq Put number n into q-reg
+;; nV Type n lines around pointer
+;; W Redraw the display
+;; nW Put point on line n of the display
+;; nXq Put n lines into q-reg
+;; n,mXq Put characters from n to m into q-reg
+;; n:Xq Append n lines to q-reg q
+;; n,m:Xq Append characters from n to m into q-reg
+;; Z Pointer position at end of buffer
+;; [q Put q-reg on stack
+;; \ Value of digit string in buffer
+;; n\ Convert n to digits and insert in buffer
+;; ]q Pop q-reg from stack
+;; :]q Test whether stack is empty and return value
+;; ` Not a Teco command
+;; a-z Treated the same as A-Z
+;; { Not a Teco command
+;; | Conditional 'else'
+;; } Not a Teco comand
+;; ~ Not a Teco command
+;; DEL Delete last character typed in
+
+;; Special q-register names:
+;;
+;; _ last search string
+;; # the current command string
+;; * last command string
+;; % the last command string or macro that returned an error,
+;; to the point at which the error was found
+
+;; Philosophy:
+;; Real programmers don't want "what you see is what you get", they want
+;; "you asked for it, you got it". They want editors that are terse,
+;; powerful, cryptic, and unforgiving. In a word, Teco.
+;; after Ed Post, "Real Programmers Don't Use Pascal", in Datamation,
+;; July 1983, p. 264
+
+;;; Code:
+;; (require 'backquote)
+
+;; The version number
+(defvar teco-version "7.9"
+ "The version of Teco.")
+
+(defun teco-version ()
+ "Return string describing the version of Teco.
+When called interactively, displays the version."
+ (interactive)
+ (if (called-interactively-p)
+ (message "Teco version %s" (teco-version))
+ teco-version))
+
+;; set a range of elements of an array to a value
+(defun teco:set-elements (array start end value)
+ (let ((i start))
+ (while (<= i end)
+ (aset array i value)
+ (setq i (1+ i)))))
+
+;; set a range of elements of an array to their indexes plus an offset
+(defun teco:set-elements-index (array start end offset)
+ (let ((i start))
+ (while (<= i end)
+ (aset array i (+ i offset))
+ (setq i (1+ i)))))
+
+(defvar teco:command-string ""
+ "The current command string being executed.")
+
+(defvar teco:command-pointer nil
+ "Pointer into teco:command-string showing next character to be executed.")
+
+(defvar teco:ctrl-r 10
+ "Current number radix.")
+
+(defvar teco:et-flag 0
+ "ET flags:
+8 do not echo ^T input
+32 do not wait for ^T input if no character is available.")
+
+(defvar teco:es-flag 0
+ "ES flags:
+1 leave pointer at end of found string after reverse search,
+rather than at beginning.")
+
+(defvar teco:ctrl-s 0
+ "The negative of the length of the last string inserted or searched for.
+Set by the S, I, TAB, G, FR, FS, and \\ commands.")
+
+(defvar teco:digit-switch nil
+ "Set if we have just executed a digit.")
+
+(defvar teco:exp-exp nil
+ "Expression value preceeding operator.")
+
+(defvar teco:exp-val1 nil
+ "Current argument value.")
+
+(defvar teco:exp-val2 nil
+ "Argument before comma.")
+
+(defvar teco:exp-flag1 nil
+ "t if argument is present.")
+
+(defvar teco:exp-flag2 nil
+ "t if argument before comma is present.")
+
+(defvar teco:exp-op nil
+ "Pending arithmetic operation on argument.")
+
+(defvar teco:exp-stack nil
+ "Stack for parenthesized expressions.")
+
+(defvar teco:macro-stack nil
+ "Stack for macro invocations.")
+
+(defvar teco:mapch-l nil
+ "Translation table to lower-case letters.")
+
+ (setq teco:mapch-l (make-vector 256 0))
+ (teco:set-elements-index teco:mapch-l 0 255 0)
+ (teco:set-elements-index teco:mapch-l ?A ?Z (- ?a ?A))
+
+(defvar teco:trace nil
+ "t if tracing is on.")
+
+(defvar teco:at-flag nil
+ "t if an @ flag is pending.")
+
+(defvar teco:colon-flag nil
+ "1 if a : flag is pending, 2 if a :: flag is pending.")
+
+(defvar teco:qspec-valid nil
+ "Flags describing whether a character is a vaid q-register name.
+3 means yes, 2 means yes but only for file and search operations.")
+
+ (setq teco:qspec-valid (make-vector 256 0))
+ (teco:set-elements teco:qspec-valid ?a ?z 3)
+ (teco:set-elements teco:qspec-valid ?0 ?9 3)
+ (aset teco:qspec-valid ?_ 2)
+ (aset teco:qspec-valid ?# 2)
+ (aset teco:qspec-valid ?* 2)
+ (aset teco:qspec-valid ?% 2)
+
+(defvar teco:iteration-stack nil
+ "Iteration list.")
+
+(defvar teco:cond-stack nil
+ "Conditional stack.")
+
+(defvar teco:qreg-text (make-vector 256 "")
+ "The text contents of the q-registers.")
+
+(defvar teco:qreg-number (make-vector 256 0)
+ "The number contents of the q-registers.")
+
+(defvar teco:qreg-stack nil
+ "The stack of saved q-registers.")
+
+(defconst teco:prompt "*"
+ "*Prompt to be used when inputting Teco command.")
+
+(defconst teco:exec-1 (make-vector 256 nil)
+ "Names of routines handling type 1 characters (characters that are
+part of expression processing).")
+
+(defconst teco:exec-2 (make-vector 256 nil)
+ "Names of routines handling type 2 characters (characters that are
+not part of expression processing).")
+
+(defvar teco:last-search-regexp ""
+ "Regexp version of last search string (q-reg '_').")
+
+(defvar teco:search-result 0
+ "Result of the last search.")
+
+(defmacro teco:define-type-1 (char &rest body)
+ "Define the code to process a type 1 character.
+Transforms
+ (teco:define-type-1 ?x
+ code ...)
+into
+ (defun teco:type-1-x ()
+ code ...)
+and does
+ (aset teco:exec-1 ?x 'teco:type-1-x)"
+ (let ((s (intern (concat "teco:type-1-" (char-to-string char)))))
+ `(progn
+ (defun ,s ()
+ ,@body)
+ (aset teco:exec-1 ,char (quote ,s)))))
+
+(defmacro teco:define-type-2 (char &rest body)
+ "Define the code to process a type 2 character.
+Transforms
+ (teco:define-type-2 ?x
+ code ...)
+into
+ (defun teco:type-2-x ()
+ code ...)
+and does
+ (aset teco:exec-2 ?x 'teco:type-2-x)"
+ (let ((s (intern (concat "teco:type-2-" (char-to-string char)))))
+ `(progn
+ (defun ,s ()
+ ,@body)
+ (aset teco:exec-2 ,char (quote ,s)))))
+
+(defconst teco:char-types (make-vector 256 0)
+ "Define the characteristics of characters, as tested by \":
+ 1 alphabetic
+ 2 alphabetic, $, or .
+ 4 digit
+ 8 alphabetic or digit
+ 16 lower-case alphabetic
+ 32 upper-case alphabetic")
+
+(teco:set-elements teco:char-types ?0 ?9 (+ 4 8))
+(teco:set-elements teco:char-types ?A ?Z (+ 1 2 8 32))
+(teco:set-elements teco:char-types ?a ?z (+ 1 2 8 16))
+(aset teco:char-types ?$ 2)
+(aset teco:char-types ?. 2)
+
+(defconst teco:error-texts '(("BNI" . "> not in iteration")
+ ("CPQ" . "Can't pop Q register")
+ ("COF" . "Can't open output file ")
+ ("FNF" . "File not found ")
+ ("IEC" . "Invalid E character")
+ ("IFC" . "Invalid F character")
+ ("IIA" . "Invalid insert arg")
+ ("ILL" . "Invalid command")
+ ("ILN" . "Invalid number")
+ ("IPA" . "Invalid P arg")
+ ("IQC" . "Invalid \" character")
+ ("IQN" . "Invalid Q-reg name")
+ ("IRA" . "Invalid radix arg")
+ ("ISA" . "Invalid search arg")
+ ("ISS" . "Invalid search or text string")
+ ("IUC" . "Invalid ^ character")
+ ("LNF" . "Label not found")
+ ("MEM" . "Insufficient memory available")
+ ("MRP" . "Missing )")
+ ("NAB" . "No arg before ^_")
+ ("NAC" . "No arg before ,")
+ ("NAE" . "No arg before =")
+ ("NAP" . "No arg before )")
+ ("NAQ" . "No arg before \"")
+ ("NAS" . "No arg before ;")
+ ("NAU" . "No arg before U")
+ ("NFI" . "No file for input")
+ ("NFO" . "No file for output")
+ ("NYA" . "Numeric arg with Y")
+ ("OFO" . "Output file already open")
+ ("PDO" . "Pushdown list overflow")
+ ("POP" . "Pointer off page")
+ ("SNI" . "; not in iteration")
+ ("SRH" . "Search failure ")
+ ("STL" . "String too long")
+ ("UTC" . "Unterminated command")
+ ("UTM" . "Unterminated macro")
+ ("XAB" . "Execution interrupted")
+ ("YCA" . "Y command suppressed")
+ ("IWA" . "Invalid W arg")
+ ("NFR" . "Numeric arg with FR")
+ ("INT" . "Internal error")
+ ("EFI" . "EOF read from std input")
+ ("IAA" . "Invalid A arg")
+ ))
+
+(defconst teco:spec-chars
+ [0 1 0 0 ; ^@ ^A ^B ^C
+ 0 64 0 0 ; ^D ^E ^F ^G
+ 0 2 128 128 ; ^H ^I ^J ^K
+ 128 0 64 0 ; ^L ^M ^N ^O
+ 0 64 64 64 ; ^P ^Q ^R ^S
+ 0 34 0 0 ; ^T ^U ^V ^W
+ 64 0 0 0 ; ^X ^Y ^Z ^\[
+ 0 0 1 0 ; ^\ ^\] ^^ ^_
+ 0 1025 1040 0 ; ! \" #
+ 0 0 0 1040; $ % & '
+ 0 0 0 0 ; \( \) * +
+ 0 0 0 0 ; , - . /
+ 0 0 0 0 ; 0 1 2 3
+ 0 0 0 0 ; 4 5 6 7
+ 0 0 0 0 ; 8 9 : ;
+ 1040 0 1040 0 ; < = > ?
+ 1 0 12 0 ; @ A B C
+ 0 9 1 32 ; D E F G
+ 0 2 0 0 ; H I J K
+ 0 32 10 1026; L M N O
+ 0 32 8 514 ; P Q R S
+ 0 32 0 4 ; T U V W
+ 32 0 0 32 ; X Y Z \[
+ 0 32 1 2 ; \ \] ^ _
+ 0 0 12 0 ; ` a b c
+ 0 9 1 32 ; d e f g
+ 0 2 0 0 ; h i j k
+ 0 32 10 1026; l m n o
+ 0 32 8 514 ; p q r s
+ 0 32 0 4 ; t u v w
+ 32 0 0 0 ; x y z {
+ 16 0 0 0 ; | } ~ DEL
+ ]
+ "The special properties of characters:
+ 1 skipto() special character
+ 2 command with std text argument
+ 4 E<char> takes a text argument
+ 8 F<char> takes a text argument
+ 16 char causes skipto() to exit
+ 32 command with q-register argument
+ 64 special char in search string
+ 128 character is a line separator
+ 256 command with a double text argument
+ 512 F<char> takes a double text argument
+ 1024 transfer of control command")
+
+
+(defun teco:execute-command (string)
+ "Execute teco command string."
+ ;; Initialize everything
+ (let ((teco:command-string string)
+ (teco:command-pointer 0)
+ (teco:digit-switch nil)
+ (teco:exp-exp nil)
+ (teco:exp-val1 nil)
+ (teco:exp-val2 nil)
+ (teco:exp-flag1 nil)
+ (teco:exp-flag2 nil)
+ (teco:exp-op 'start)
+ (teco:trace nil)
+ (teco:at-flag nil)
+ (teco:colon-flag nil)
+ (teco:iteration-stack nil)
+ (teco:cond-stack nil)
+ (teco:exp-stack nil)
+ (teco:macro-stack nil)
+ (teco:qreg-stack nil)
+ (teco:search-result 0))
+ ;; save command string
+ (aset teco:qreg-text ?* (aref teco:qreg-text ?#))
+ (aset teco:qreg-text ?# string)
+ ;; initialize output
+ (teco:out-init)
+ ;; execute commands
+ (catch 'teco:exit
+ (while t
+ ;; get next command character
+ (let ((cmdc (teco:get-command0 teco:trace)))
+ ;; if it's ^, interpret the next character as a control character
+ (if (eq cmdc ?^)
+ (setq cmdc (logand (teco:get-command teco:trace) 31)))
+ (if (and (<= ?0 cmdc) (<= cmdc ?9))
+ ;; process a number
+ (progn
+ (setq cmdc (- cmdc ?0))
+ ;; check for invalid digit
+ (if (>= cmdc teco:ctrl-r)
+ (teco:error "ILN"))
+ (if teco:digit-switch
+ ;; later digits
+ (setq teco:exp-val1
+ (+ (* teco:exp-val1 teco:ctrl-r) cmdc))
+ ;; first digit
+ (setq teco:exp-val1 cmdc)
+ (setq teco:digit-switch t))
+ ;; indicate a value was read in
+ (setq teco:exp-flag1 t))
+ ;; not a digit
+ (setq teco:digit-switch nil)
+ ;; cannonicalize the case
+ (setq cmdc (aref teco:mapch-l cmdc))
+ ;; dispatch on the character, if it is a type 1 character
+ (let ((r (aref teco:exec-1 cmdc)))
+ (if r
+ (funcall r)
+ ;; if a value has been entered, process any pending operation
+ (if teco:exp-flag1
+ (cond ((eq teco:exp-op 'start)
+ nil)
+ ((eq teco:exp-op 'add)
+ (setq teco:exp-val1 (+ teco:exp-exp teco:exp-val1))
+ (setq teco:exp-op 'start))
+ ((eq teco:exp-op 'sub)
+ (setq teco:exp-val1 (- teco:exp-exp teco:exp-val1))
+ (setq teco:exp-op 'start))
+ ((eq teco:exp-op 'mult)
+ (setq teco:exp-val1 (* teco:exp-exp teco:exp-val1))
+ (setq teco:exp-op 'start))
+ ((eq teco:exp-op 'div)
+ (setq teco:exp-val1
+ (if (/= teco:exp-val1 0)
+ (/ teco:exp-exp teco:exp-val1)
+ 0))
+ (setq teco:exp-op 'start))
+ ((eq teco:exp-op 'and)
+ (setq teco:exp-val1
+ (logand teco:exp-exp teco:exp-val1))
+ (setq teco:exp-op 'start))
+ ((eq teco:exp-op 'or)
+ (setq teco:exp-val1
+ (logior teco:exp-exp teco:exp-val1))
+ (setq teco:exp-op 'start)))
+ ;; a solitary '-' yields -1
+ (if (eq teco:exp-op 'sub)
+ (setq teco:exp-val1 -1
+ teco:exp-op 'start
+ teco:exp-flag1 t)))
+ ;; dispatch on a type 2 character
+ (let ((r (aref teco:exec-2 cmdc)))
+ (if r
+ (funcall r)
+ (teco:error "ILL")))))))))))
+
+;; Type 1 commands
+
+(teco:define-type-1
+ ?\^m ; CR
+ nil)
+
+(teco:define-type-1
+ ?\n ; LF
+ nil)
+
+(teco:define-type-1
+ ?\^k ; VT
+ nil)
+
+(teco:define-type-1
+ ?\^l ; FF
+ nil)
+
+(teco:define-type-1
+ 32 ; SPC
+ nil)
+
+(teco:define-type-1
+ ?\e ; ESC
+ (if (teco:peek-command ?\e)
+ ;; ESC ESC terminates macro or command
+ (teco:pop-macro-stack)
+ ;; otherwise, consume arguments
+ (setq teco:exp-flag1 nil
+ teco:exp-flag2 nil
+ teco:exp-op 'start)))
+
+(teco:define-type-1
+ ?! ; !
+ (while (/= (teco:get-command teco:trace) ?!)
+ nil)
+ (setq teco:at-flag nil))
+
+(teco:define-type-1
+ ?@ ; @
+ ;; set at-flag
+ (setq teco:at-flag t))
+
+(teco:define-type-1
+ ?: ; :
+ ;; is it '::'?
+ (if (teco:peek-command ?:)
+ (progn
+ ;; skip second colon
+ (teco:get-command teco:trace)
+ ;; set flag to show two colons
+ (setq teco:colon-flag 2))
+ ;; set flag to show one colon
+ (setq teco:colon-flag 1)))
+
+(teco:define-type-1
+ ?? ; ?
+ ;; toggle trace
+ (setq teco:trace (not teco:trace)))
+
+(teco:define-type-1
+ ?. ; .
+ ;; value is point
+ (setq teco:exp-val1 (point)
+ teco:exp-flag1 t))
+
+(teco:define-type-1
+ ?z ; z
+ ;; value is point-max
+ (setq teco:exp-val1 (point-max)
+ teco:exp-flag1 t))
+
+(teco:define-type-1
+ ?b ; b
+ ;; value is point-min
+ (setq teco:exp-val1 (point-min)
+ teco:exp-flag1 t))
+
+(teco:define-type-1
+ ?h ; h
+ ;; value is b,z
+ (setq teco:exp-val1 (point-max)
+ teco:exp-val2 (point-min)
+ teco:exp-flag1 t
+ teco:exp-flag2 t
+ teco:exp-op 'start))
+
+(teco:define-type-1
+ ?\^s ; ^s
+ ;; value is - length of last insert, etc.
+ (setq teco:exp-val1 teco:ctrl-s
+ teco:exp-flag1 t))
+
+(teco:define-type-1
+ ?\^y ; ^y
+ ;; value is .+^S,.
+ (setq teco:exp-val1 (point)
+ teco:exp-val2 (+ (point) teco:ctrl-s)
+ teco:exp-flag1 t
+ teco:exp-flag2 t
+ teco:exp-op 'start))
+
+(teco:define-type-1
+ ?\( ; \(
+ ;; push expression stack
+ (teco:push-exp-stack)
+ (setq teco:exp-flag1 nil
+ teco:exp-flag2 nil
+ teco:exp-op 'start))
+
+(teco:define-type-1
+ ?\C-^ ; ^^
+ ;; get next command character
+ (setq teco:exp-val1 (teco:get-command teco:trace)
+ teco:exp-flag1 t))
+
+
+;; Type 2 commands
+(teco:define-type-2
+ ?+ ; +
+ (setq teco:exp-exp (if teco:exp-flag1 teco:exp-val1 0)
+ teco:exp-flag1 nil
+ teco:exp-op 'add))
+
+(teco:define-type-2
+ ?- ; -
+ (setq teco:exp-exp (if teco:exp-flag1 teco:exp-val1 0)
+ teco:exp-flag1 nil
+ teco:exp-op 'sub))
+
+(teco:define-type-2
+ ?* ; *
+ (setq teco:exp-exp (if teco:exp-flag1 teco:exp-val1 0)
+ teco:exp-flag1 nil
+ teco:exp-op 'mult))
+
+(teco:define-type-2
+ ?/ ; /
+ (setq teco:exp-exp (if teco:exp-flag1 teco:exp-val1 0)
+ teco:exp-flag1 nil
+ teco:exp-op 'div))
+
+(teco:define-type-2
+ ?& ; &
+ (setq teco:exp-exp (if teco:exp-flag1 teco:exp-val1 0)
+ teco:exp-flag1 nil
+ teco:exp-op 'and))
+
+(teco:define-type-2
+ ?# ; #
+ (setq teco:exp-exp (if teco:exp-flag1 teco:exp-val1 0)
+ teco:exp-flag1 nil
+ teco:exp-op 'or))
+
+(teco:define-type-2
+ ?\) ; \)
+ (if (or (not teco:exp-flag1) (not teco:exp-stack))
+ (teco:error "NAP"))
+ (let ((v teco:exp-val1))
+ (teco:pop-exp-stack)
+ (setq teco:exp-val1 v
+ teco:exp-flag1 t)))
+
+(teco:define-type-2
+ ?, ; ,
+ (if (not teco:exp-flag1)
+ (teco:error "NAC"))
+ (setq teco:exp-val2 teco:exp-val1
+ teco:exp-flag2 t
+ teco:exp-flag1 nil))
+
+(teco:define-type-2
+ ?\^_ ; ^_
+ (if (not teco:exp-flag1)
+ (teco:error "NAB")
+ (setq teco:exp-val1 (lognot teco:exp-val1))))
+
+(teco:define-type-2
+ ?\^d ; ^d
+ (setq teco:ctrl-r 10
+ teco:exp-flag1 nil
+ teco:exp-op 'start))
+
+(teco:define-type-2
+ ?\^o ; ^o
+ (setq teco:ctrl-r 8
+ teco:exp-flag1 nil
+ teco:exp-op 'start))
+
+(teco:define-type-2
+ ?\^r ; ^r
+ (if teco:colon-flag
+ (progn
+ (recursive-edit)
+ (setq teco:colon-flag nil))
+ (if teco:exp-flag1
+ ;; set radix
+ (progn
+ (if (and (/= teco:exp-val1 8)
+ (/= teco:exp-val1 10)
+ (/= teco:exp-val1 16))
+ (teco:error "IRA"))
+ (setq teco:ctrl-r teco:exp-val1
+ teco:exp-flag1 nil
+ teco:exp-op 'start))
+ ;; get radix
+ (setq teco:exp-val1 teco:ctrl-r
+ teco:exp-flag1 t))))
+
+(teco:define-type-2
+ ?\^c ; ^c
+ (if (teco:peek-command ?\^c)
+ ;; ^C^C stops execution
+ (throw 'teco:exit nil)
+ (if teco:macro-stack
+ ;; ^C inside macro exits macro
+ (teco:pop-macro-stack)
+ ;; ^C in command stops execution
+ (throw 'teco:exit nil))))
+
+(teco:define-type-2
+ ?\^x ; ^x
+ ;; set/get search mode flag, which is case-fold-search
+ (let ((x-flag (if case-fold-search 0 -1)))
+ (teco:set-var 'x-flag)
+ (setq case-fold-search (= x-flag 0))))
+
+(teco:define-type-2
+ ?m ; m
+ (let ((macro-name (teco:get-qspec nil
+ (teco:get-command teco:trace))))
+ (teco:push-macro-stack)
+ (setq teco:command-string (aref teco:qreg-text macro-name)
+ teco:command-pointer 0)))
+
+(teco:define-type-2
+ ?< ; <
+ ;; begin iteration
+ (if (and teco:exp-flag1 (<= teco:exp-val1 0))
+ ;; if this is not to be executed, just skip the
+ ;; intervening stuff
+ (teco:find-enditer)
+ ;; push iteration stack
+ (teco:push-iter-stack teco:command-pointer
+ teco:exp-flag1 teco:exp-val1)
+ ;; consume the argument
+ (setq teco:exp-flag1 nil
+ teco:at-flag nil)))
+
+(teco:define-type-2
+ ?> ; >
+ ;; end iteration
+ (if (not teco:iteration-stack)
+ (teco:error "BNI"))
+ ;; decrement count and pop conditionally
+ (teco:pop-iter-stack nil)
+ ;; consume arguments
+ (setq teco:exp-flag1 nil
+ teco:exp-flag2 nil
+ teco:exp-op 'start
+ teco:at-flag nil))
+
+(teco:define-type-2
+ 59 ; ;
+ ;; semicolon iteration exit
+ (if (not teco:iteration-stack)
+ (teco:error "SNI"))
+ ;; if exit
+ (if (if (>= (if teco:exp-flag1
+ teco:exp-val1
+ teco:search-result) 0)
+ (not teco:colon-flag)
+ teco:colon-flag)
+ (progn
+ (teco:find-enditer)
+ (teco:pop-iter-stack t)))
+ ;; consume argument and colon
+ (setq teco:exp-flag1 nil
+ teco:colon-flag nil
+ teco:exp-op 'start))
+
+(teco:define-type-2
+ ?\" ; \"
+ ;; must be an argument
+ (if (not teco:exp-flag1)
+ (teco:error "NAQ"))
+ ;; consume argument
+ (setq teco:exp-flag1 nil
+ teco:exp-op 'start)
+ (let* (;; get the test specification
+ (c (aref teco:mapch-l (teco:get-command teco:trace)))
+ ;; determine whether the test is true
+ (test (cond ((eq c ?a)
+ (/= (logand (aref teco:char-types teco:exp-val1)
+ 1) 0))
+ ((eq c ?c)
+ (/= (logand (aref teco:char-types teco:exp-val1)
+ 2) 0))
+ ((eq c ?d)
+ (/= (logand (aref teco:char-types teco:exp-val1)
+ 4) 0))
+ ((or (eq c ?e) (eq c ?f) (eq c ?u) (eq c ?=))
+ (= teco:exp-val1 0))
+ ((or (eq c ?g) (eq c ?>))
+ (> teco:exp-val1 0))
+ ((or (eq c ?l) (eq c ?s) (eq c ?t) (eq c ?<))
+ (< teco:exp-val1 0))
+ ((eq c ?n)
+ (/= teco:exp-val1 0))
+ ((eq c ?r)
+ (/= (logand (aref teco:char-types teco:exp-val1)
+ 8) 0))
+ ((eq c ?v)
+ (/= (logand (aref teco:char-types teco:exp-val1)
+ 16) 0))
+ ((eq c ?w)
+ (/= (logand (aref teco:char-types teco:exp-val1)
+ 32) 0))
+ (t
+ (teco:error "IQC")))))
+ (if (not test)
+ ;; if the conditional isn't satisfied, read
+ ;; to matching | or '
+ ;; ll counts the number of conditionals we are inside of
+ (let ((ll 1)
+ c)
+ (while (> ll 0)
+ ;; skip to the next significant character
+ (while (progn (setq c (teco:skipto))
+ (and (/= c ?\")
+ (/= c ?|)
+ (/= c ?\')))
+ nil)
+ (if (= c ?\")
+ (setq ll (1+ ll))
+ (if (= c ?\')
+ (setq ll (1- ll))
+ (if (= ll 1)
+ (setq ll 0) ; for immediate exit if | at ll=1
+ ))))))
+ ;; clear at-flag
+ (setq teco:at-flag nil)))
+
+(teco:define-type-2
+ ?' ; '
+ ;; no effect if executing
+ ;; clear at-flag
+ (setq teco:at-flag nil))
+
+(teco:define-type-2
+ ?| ; |
+ (let ((ll 1)
+ c)
+ (while (> ll 0)
+ (while (progn (setq c (teco:skipto))
+ (and (/= c ?\")
+ (/= c ?\')))
+ nil)
+ (if (= c ?\")
+ (setq ll (1+ ll))
+ (setq ll (1- ll))))))
+
+(teco:define-type-2
+ ?u ; u
+ (if (not teco:exp-flag1)
+ (teco:error "NAU"))
+ (aset teco:qreg-number
+ (teco:get-qspec 0 (teco:get-command teco:trace))
+ teco:exp-val1)
+ (setq teco:exp-flag1 teco:exp-flag2 ; command's value is second arg
+ teco:exp-val1 teco:exp-val2
+ teco:exp-flag2 nil
+ teco:exp-op 'start))
+
+(teco:define-type-2
+ ?q ; q
+ ;; Qn is numeric val, :Qn is # of chars, mQn is mth char
+ (let ((mm (teco:get-qspec (or teco:colon-flag teco:exp-flag1)
+ (teco:get-command teco:trace))))
+ (if (not teco:exp-flag1)
+ (setq teco:exp-val1 (if teco:colon-flag
+ ;; :Qn
+ (length (aref teco:qreg-text mm))
+ ;; Qn
+ (aref teco:qreg-number mm))
+ teco:exp-flag1 t)
+ ;; mQn
+ (let ((v (aref teco:qreg-text mm)))
+ (setq teco:exp-val1 (condition-case nil
+ (aref v teco:exp-val1)
+ (error -1))
+ teco:exp-op 'start)))
+ (setq teco:colon-flag nil)))
+
+(teco:define-type-2
+ ?% ; %
+ (let* ((mm (teco:get-qspec nil (teco:get-command teco:trace)))
+ (v (+ (aref teco:qreg-number mm) (teco:get-value 1))))
+ (aset teco:qreg-number mm v)
+ (setq teco:exp-val1 v
+ teco:exp-flag1 t)))
+
+(teco:define-type-2
+ ?c ; c
+ (let ((p (+ (point) (teco:get-value 1))))
+ (if (or (< p (point-min)) (> p (point-max)))
+ (teco:error "POP")
+ (goto-char p)
+ (setq teco:exp-flag2 nil))))
+
+(teco:define-type-2
+ ?r ; r
+ (let ((p (- (point) (teco:get-value 1))))
+ (if (or (< p (point-min)) (> p (point-max)))
+ (teco:error "POP")
+ (goto-char p)
+ (setq teco:exp-flag2 nil))))
+
+(teco:define-type-2
+ ?j ; j
+ (let ((p (teco:get-value (point-min))))
+ (if (or (< p (point-min)) (> p (point-max)))
+ (teco:error "POP")
+ (goto-char p)
+ (setq teco:exp-flag1 nil
+ teco:exp-flag2 nil))))
+
+(teco:define-type-2
+ ?l ; l
+ ;; move forward by lines
+ (let* ((ll (teco:line-args))
+ (p (+ (car ll) (cdr ll) (- (point)))))
+ (if (or (< p (point-min)) (> p (point-max)))
+ (teco:error "POP")
+ (goto-char p))))
+
+(teco:define-type-2
+ ?\C-q ; ^q
+ ;; number of characters until the nth line feed
+ (setq teco:exp-val1 (teco:lines (teco:get-value 1))
+ teco:exp-flag1 t))
+
+(teco:define-type-2
+ ?= ; =
+ ;; print numeric value
+ (if (not teco:exp-flag1)
+ (teco:error "NAE"))
+ (teco:output (format
+ (if (teco:peek-command ?=)
+ ;; at least one more =
+ (progn
+ ;; read past it
+ (teco:get-command teco:trace)
+ (if (teco:peek-command ?=)
+ ;; another?
+ (progn
+ ;; read it too
+ (teco:get-command teco:trace)
+ ;; print in hex
+ "%x")
+ ;; print in octal
+ "%o"))
+ ;; print in decimal
+ "%d")
+ teco:exp-val1))
+ ;; add newline if no colon
+ (if (not teco:colon-flag)
+ (teco:output ?\n))
+ ;; absorb argument, etc.
+ (setq teco:exp-flag1 nil
+ teco:exp-flag2 nil
+ teco:colon-flag nil
+ teco:exp-op 'start))
+
+(teco:define-type-2
+ ?\t ; TAB
+ (if teco:exp-flag1
+ (teco:error "IIA"))
+ (let ((text (teco:get-text-arg)))
+ (insert ?\t text)
+ (setq teco:ctrl-s (- (1+ (length text)))))
+ ;; clear arguments
+ (setq teco:colon-flag nil
+ teco:exp-flag1 nil
+ teco:exp-flag2 nil))
+
+(teco:define-type-2
+ ?i ; i
+ (let ((text (teco:get-text-arg)))
+ (if teco:exp-flag1
+ ;; if a nI$ command
+ (progn
+ ;; text argument must be null
+ (or (string-equal text "") (teco:error "IIA"))
+ ;; insert the character
+ (insert teco:exp-val1)
+ (setq teco:ctrl-s -1)
+ ;; consume argument
+ (setq teco:exp-op 'start))
+ ;; otherwise, insert the text
+ (insert text)
+ (setq teco:ctrl-s (- (length text))))
+ ;; clear arguments
+ (setq teco:colon-flag nil
+ teco:exp-flag1 nil
+ teco:exp-flag2 nil)))
+
+(teco:define-type-2
+ ?t ; t
+ (let ((args (teco:line-args)))
+ (teco:output (buffer-substring (car args) (cdr args)))))
+
+(teco:define-type-2
+ ?v ; v
+ (let ((ll (teco:get-value 1)))
+ (teco:output (buffer-substring (+ (point) (teco:lines (- 1 ll)))
+ (+ (point) (teco:lines ll))))))
+
+(teco:define-type-2
+ ?\C-a ; ^a
+ (teco:output (teco:get-text-arg nil ?\C-a))
+ (setq teco:at-flag nil
+ teco:colon-flag nil
+ teco:exp-flag1 nil
+ teco:exp-flag2 nil
+ teco:exp-op 'start))
+
+(teco:define-type-2
+ ?d ; d
+ (if (not teco:exp-flag2)
+ ;; if only one argument
+ (delete-char (teco:get-value 1))
+ ;; if two arguments, treat as n,mK
+ (let ((ll (teco:line-args)))
+ (delete-region (car ll) (cdr ll)))))
+
+(teco:define-type-2
+ ?k ; k
+ (let ((ll (teco:line-args)))
+ (delete-region (car ll) (cdr ll))))
+
+(teco:define-type-2
+ ?\C-u ; ^u
+ (let* ((mm (teco:get-qspec nil (teco:get-command teco:trace)))
+ (text-arg (teco:get-text-arg))
+ (text (if (not teco:exp-flag1)
+ text-arg
+ (if (string-equal text-arg "")
+ (char-to-string teco:exp-val1)
+ (teco:error "IIA")))))
+ ;; if :, append to the register
+ (aset teco:qreg-text mm (if teco:colon-flag
+ (concat (aref teco:qreg-text mm) text)
+ text))
+ ;; clear various flags
+ (setq teco:exp-flag1 nil
+ teco:at-flag nil
+ teco:colon-flag nil
+ teco:exp-flag1 nil)))
+
+(teco:define-type-2
+ ?x ; x
+ (let* ((mm (teco:get-qspec nil (teco:get-command teco:trace)))
+ (args (teco:line-args))
+ (text (buffer-substring (car args) (cdr args))))
+ ;; if :, append to the register
+ (aset teco:qreg-text mm (if teco:colon-flag
+ (concat (aref teco:qreg-text mm) text)
+ text))
+ ;; clear various flags
+ (setq teco:at-flag nil
+ teco:colon-flag nil)))
+
+(teco:define-type-2
+ ?g ; g
+ (let ((mm (teco:get-qspec t (teco:get-command teco:trace))))
+ (if teco:colon-flag
+ (teco:output (aref teco:qreg-text mm))
+ (let ((text (aref teco:qreg-text mm)))
+ (insert text)
+ (setq teco:ctrl-s (- (length text)))))
+ (setq teco:colon-flag nil)))
+
+(teco:define-type-2
+ ?\[ ; \[
+ (let ((mm (teco:get-qspec t (teco:get-command teco:trace))))
+ (setq teco:qreg-stack
+ (cons (cons (aref teco:qreg-text mm)
+ (aref teco:qreg-number mm))
+ teco:qreg-stack))))
+
+(teco:define-type-2
+ ?\] ; \]
+ (let ((mm (teco:get-qspec t (teco:get-command teco:trace))))
+ (if teco:colon-flag
+ (setq teco:exp-flag1 t
+ teco:exp-val1 (if teco:qreg-stack -1 0))
+ (if teco:qreg-stack
+ (let ((pop (car teco:qreg-stack)))
+ (aset teco:qreg-text mm (car pop))
+ (aset teco:qreg-number mm (cdr pop))
+ (setq teco:qreg-stack (cdr teco:qreg-stack)))
+ (teco:error "CPQ")))
+ (setq teco:colon-flag nil)))
+
+(teco:define-type-2
+ ?\\ ; \
+ (if (not teco:exp-flag1)
+ ;; no argument; read number
+ (let ((p (point))
+ (sign +1)
+ (n 0)
+ c)
+ (setq c (char-after p))
+ (if c
+ (if (= c ?+)
+ (setq p (1+ p))
+ (if (= c ?-)
+ (setq p (1+ p)
+ sign -1))))
+ (cond
+ ((= teco:ctrl-r 8)
+ (while (progn
+ (setq c (char-after p))
+ (and c (>= c ?0) (<= c ?7)))
+ (setq p (1+ p)
+ n (+ c -48 (* n 8)))))
+ ((= teco:ctrl-r 10)
+ (while (progn
+ (setq c (char-after p))
+ (and c (>= c ?0) (<= c ?9)))
+ (setq p (1+ p)
+ n (+ c -48 (* n 10)))))
+ (t
+ (while (progn
+ (setq c (char-after p))
+ (and c
+ (or
+ (and (>= c ?0) (<= c ?9))
+ (and (>= c ?a) (<= c ?f))
+ (and (>= c ?A) (<= c ?F)))))
+ (setq p (1+ p)
+ n (+ c (if (> c ?F)
+ ;; convert 'a' to 10
+ -87
+ (if (> c ?9)
+ ;; convert 'A' to 10
+ -55
+ ;; convert '0' to 0
+ -48))
+ (* n 16))))))
+ (setq teco:exp-val1 (* n sign)
+ teco:exp-flag1 t
+ teco:ctrl-s (- (point) p))
+ (goto-char p))
+ ;; argument: insert it as a digit string
+ (insert (format (cond
+ ((= teco:ctrl-r 8) "%o")
+ ((= teco:ctrl-r 10) "%d")
+ (t "%x"))
+ teco:exp-val1))
+ (setq teco:exp-flag1 nil
+ teco:exp-op 'start)))
+
+(teco:define-type-2
+ ?\C-t ; ^t
+ (if teco:exp-flag1
+ ;; type a character
+ (progn
+ (teco:output teco:exp-val1)
+ (setq teco:exp-flag1 nil))
+ ;; input a character
+ (if (or (= (logand teco:et-flag 32) 0)
+ (input-pending-p))
+ ;; input is pending, or we must wait
+ (let* ((echo-keystrokes 0)
+ (c (read-char)))
+ (if (= (logand teco:et-flag 8) 0)
+ (teco:output c))
+ (setq teco:exp-val1 c
+ teco:exp-flag1 t))
+ ;; no input is pending, and ET bit 32 is set
+ (setq teco:exp-val1 -1
+ teco:exp-flag1 t))))
+
+(teco:define-type-2
+ ?w ; w
+ (if teco:exp-flag1
+ (progn
+ (recenter teco:exp-val1)
+ (setq teco:exp-flag1 nil))
+ (redraw-display)))
+
+(teco:define-type-2
+ ?s ; s
+ (let ((arg (teco:get-text-arg))
+ (count (if teco:exp-flag1 teco:exp-val1 1))
+ regexp)
+ (if (string-equal arg "")
+ ;; Retrieve last search string
+ (setq regexp teco:last-search-regexp
+ arg (aref teco:qreg-text ?_))
+ ;; Store this search string
+ (setq regexp (teco:parse-search-string arg)
+ teco:last-search-regexp regexp)
+ (aset teco:qreg-text ?_ arg))
+ (let ((result (cond
+ ((eq teco:colon-flag 2)
+ (looking-at regexp))
+ ((> count 0)
+ (re-search-forward regexp nil t count))
+ ((< count 0)
+ (re-search-backward regexp nil t (- count)))
+ (t
+ ;; 0s is always successful
+ t))))
+ (if (and result
+ (< count 0)
+ (= (logand teco:es-flag 1) 1))
+ (goto-char (match-end 0)))
+ ;; set ctrl-s, if the match was successful
+ (if (and result
+ (or (/= count 0) (eq teco:colon-flag 2)))
+ (setq teco:ctrl-s (- (match-beginning 0) (match-end 0))))
+ ;; save result for later ';'
+ (setq teco:search-result (if result -1 0))
+ ;; if no real or implied colon, error if not found
+ (if (and (not result)
+ (not teco:colon-flag)
+ (not (teco:peek-command 59)))
+ (teco:error "SRH"))
+ ;; set return results
+ (if teco:colon-flag
+ (setq teco:exp-flag1 t
+ teco:exp-val1 teco:search-result)
+ (setq teco:exp-flag1 nil))
+ ;; clear other flags
+ (setq teco:exp-flag2 nil
+ teco:colon-flag nil
+ teco:at-flag nil
+ teco:exp-op 'start))))
+
+(defun teco:parse-search-string (s)
+ (let ((i 0)
+ (l (length s))
+ (r "")
+ c)
+ (while (< i l)
+ (setq r (concat r (teco:parse-search-string-1))))
+ r))
+
+(defun teco:parse-search-string-1 ()
+ (if (>= i l)
+ (teco:error "ISS"))
+ (setq c (aref s i))
+ (setq i (1+ i))
+ (cond
+ ((eq c ?\C-e) ; ^E - special match characters
+ (teco:parse-search-string-e))
+ ((eq c ?\C-n) ; ^Nx - match all but x
+ (teco:parse-search-string-n))
+ ((eq c ?\C-q) ; ^Qx - use x literally
+ (teco:parse-search-string-q))
+ ((eq c ?\C-s) ; ^S - match separator chars
+ "[^A-Za-z0-9]")
+ ((eq c ?\C-x) ; ^X - match any character
+ "[\000-\377]")
+ (t ; ordinary character
+ (teco:parse-search-string-char c))))
+
+(defun teco:parse-search-string-char (c)
+ (regexp-quote (char-to-string c)))
+
+(defun teco:parse-search-string-q ()
+ (if (>= i l)
+ (teco:error "ISS"))
+ (setq c (aref s i))
+ (setq i (1+ i))
+ (teco:parse-search-string-char c))
+
+(defun teco:parse-search-string-e ()
+ (if (>= i l)
+ (teco:error "ISS"))
+ (setq c (aref s i))
+ (setq i (1+ i))
+ (cond
+ ((or (eq c ?a) (eq c ?A)) ; ^EA - match alphabetics
+ "[A-Za-z]")
+ ((or (eq c ?c) (eq c ?C)) ; ^EC - match symbol constituents
+ "[A-Za-z.$]")
+ ((or (eq c ?d) (eq c ?D)) ; ^ED - match numerics
+ "[0-9]")
+ ((eq c ?g) ; ^EGq - match any char in q-reg
+ (teco:parse-search-string-e-g))
+ ((or (eq c ?l) (eq c ?L)) ; ^EL - match line terminators
+ "[\012\013\014]")
+ ((eq c ?q) ; ^EQq - use contents of q-reg
+ (teco:parse-search-string-e-q))
+ ((eq c ?r) ; ^ER - match alphanumerics
+ "[A-Za-z0-9]")
+ ((eq c ?s) ; ^ES - match non-null space/tab seq
+ "[ \t]+")
+ ((eq c ?v) ; ^EV - match lower case alphabetic
+ "[a-z]")
+ ((eq c ?w) ; ^EW - match upper case alphabetic
+ "[A-Z]")
+ ((eq c ?x) ; ^EX - match any character
+ "[\000-\377]")
+ (t
+ (teco:error "ISS"))))
+
+(defun teco:parse-search-string-e-q ()
+ (if (>= i l)
+ (teco:error "ISS"))
+ (setq c (aref s i))
+ (setq i (1+ i))
+ (regexp-quote (aref teco:q-reg-text c)))
+
+(defun teco:parse-search-string-e-g ()
+ (if (>= i l)
+ (teco:error "ISS"))
+ (setq c (aref s i))
+ (setq i (1+ i))
+ (let* ((q (aref teco:qreg-text c))
+ (len (length q))
+ (null (= len 0))
+ (one-char (= len 1))
+ (dash-present (string-match "-" q))
+ (caret-present (string-match "\\^" q))
+ (outbracket-present (string-match "]" q))
+ p)
+ (cond
+ (null
+ "[^\000-\377]")
+ (one-char
+ (teco:parse-search-string-char c))
+ (t
+ (while (setq p (string-match "^]\\^" q)) ;FIXME
+ (setq q (concat (substring q 1 p) (substring q (1+ p)))))
+ (concat
+ "["
+ (if outbracket-present "]" "")
+ (if dash-present "---" "")
+ q
+ (if caret-present "^" ""))))))
+
+(defun teco:parse-search-string-n ()
+ (let ((p (teco:parse-search-string-1)))
+ (cond
+ ((= (aref p 0) ?\[)
+ (if (= (aref p 1) ?^)
+ ;; complement character set
+ (if (= (length p) 4)
+ ;; complement of one character
+ (teco:parse-search-string-char (aref p 2))
+ ;; complement of more than one character
+ (concat "[" (substring p 2)))
+ ;; character set - invert it
+ (concat "[^" (substring p 1))))
+ ((= (aref p 0) ?\\)
+ ;; single quoted character
+ (concat "[^" (substring p 1) "]"))
+ (t
+ ;; single character
+ (if (string-equal p "-")
+ "[^---]"
+ (concat "[^" p "]"))))))
+
+(defun teco:substitute-text-string (s)
+ (let ((i 0)
+ (l (length s))
+ (r "")
+ c)
+ (while (< i l)
+ (setq r (concat r (teco:substitute-text-string-1))))
+ r))
+
+(defun teco:substitute-text-string-1 ()
+ (if (>= i l)
+ (teco:error "ISS"))
+ (setq c (aref s i))
+ (setq i (1+ i))
+ (cond
+ ((eq c ?\C-e) ; ^E - special string characters
+ (teco:substitute-text-string-e))
+ ((eq c ?\C-q) ; ^Qx - use x literally
+ (teco:substitute-text-string-q))
+ (t ; ordinary character
+ (char-to-string c))))
+
+(defun teco:substitute-text-string-q ()
+ (if (>= i l)
+ (teco:error "ISS"))
+ (setq c (aref s i))
+ (setq i (1+ i))
+ (char-to-string c))
+
+(defun teco:substitute-text-string-e ()
+ (if (>= i l)
+ (teco:error "ISS"))
+ (setq c (aref s i))
+ (setq i (1+ i))
+ (cond
+ ((eq c ?q) ; ^EQq - use contents of q-reg
+ (teco:substitute-text-string-e-q))
+ (t
+ (teco:error "ISS"))))
+
+(defun teco:substitute-text-string-e-q ()
+ (if (>= i l)
+ (teco:error "ISS"))
+ (setq c (aref s i))
+ (setq i (1+ i))
+ (aref teco:q-reg-text c))
+
+(teco:define-type-2
+ ?o ; o
+ (let ((label (teco:get-text-arg))
+ (index (and teco:exp-flag1 teco:exp-val1)))
+ (setq teco:exp-flag1 nil)
+ ;; handle computed goto by extracting the proper label
+ (if index
+ (if (< index 0)
+ ;; argument < 0 is a noop
+ (setq label "")
+ ;; otherwise, find the n-th label (0-origin)
+ (setq label (concat label ","))
+ (let ((p 0)
+ q)
+ (while (and (> index 0)
+ (setq p (string-match "," label p))
+ (setq p (1+ p)))
+ (setq index (1- index)))
+ (setq q (string-match "," label p))
+ (setq label (substring label p q)))))
+ ;; if the label is non-null, find the correct label
+ ;; start from beginning of iteration or macro, and look for tag
+ (setq teco:command-pointer
+ (if teco:iteration-stack
+ ;; if in iteration, start at beginning of iteration
+ (aref (car teco:iteration-stack) 0)
+ ;; if not in iteration, start at beginning of command or macro
+ 0))
+ ;; search for tag
+ (catch 'label
+ (let ((level 0)
+ c p l)
+ ;; look for interesting things, including !
+ (while t
+ (setq c (teco:skipto t))
+ (cond
+ ((= c ?<) ; start of iteration
+ (setq level (1+ level)))
+ ((= c ?>) ; end of iteration
+ (if (= level 0)
+ (teco:pop-iter-stack t)
+ (setq level (1- level))))
+ ((= c ?!) ; start of tag
+ (setq p (string-match "!" teco:command-string teco:command-pointer))
+ (if (and p
+ (string-equal label (substring teco:command-string
+ teco:command-pointer
+ p)))
+ (progn
+ (setq teco:command-pointer (1+ p))
+ (throw 'label nil))))))))))
+
+(teco:define-type-2
+ ?a ; :a
+ ;; 'a' must be used as ':a'
+ (if (and teco:exp-flag1 teco:colon-flag)
+ (let ((char (+ (point) teco:exp-val1)))
+ (setq teco:exp-val1
+ (if (and (>= char (point-min))
+ (< char (point-max)))
+ (char-after char)
+ -1)
+ teco:colon-flag nil))
+ (teco:error "ILL")))
+
+(teco:define-type-2
+ ?e ; e
+ (let ((c (teco:get-command teco:trace)))
+ (cond
+ ((= c ?t) (teco:set-var 'teco:et-flag))
+ ((= c ?s) (teco:set-var 'teco:es-flag))
+ (t (teco:error "IEC")))))
+
+(teco:define-type-2
+ ?f ; f
+ (let ((c (teco:get-command teco:trace)))
+ (cond
+ ((= c ?e) (teco:fe-command))
+ ((= c ?l) (teco:fl-command))
+ ((= c ?r) (teco:fr-command))
+ ((= c ?s) (teco:fs-command))
+ ((= c ?w) (teco:fw-command))
+ (t (teco:error "IFC")))))
+
+(defun teco:fe-command ()
+ "Aka fe."
+ (let ((text (teco:substitute-text-string (teco:get-text-arg))))
+ (prin1-to-string (eval (read text)))))
+
+(defun teco:fl-command ()
+ "Aka fl."
+ (let ((count (teco:get-value 1))
+ (start (point)))
+ ;; argument 0 is a no-op
+ (if (/= count 0)
+ (forward-sexp count))
+ ;; get the result values into the arguments
+ (setq teco:exp-val2 start
+ teco:exp-flag2 t
+ teco:exp-val1 (point)
+ teco:exp-flag1 t
+ teco:colon-flag nil)
+ ;; don't move the point
+ (goto-char start)))
+
+(defun teco:fr-command ()
+ "Aka fr."
+ (let ((text (teco:get-text-arg)))
+ ;; delete the previous match
+ (delete-char teco:ctrl-s)
+ ;; insert the argument
+ (insert text)
+ ;; set ^S for the insertion
+ (setq teco:ctrl-s (- (length text)))))
+
+(defun teco:fs-command ()
+ "Aka fs."
+ (let* ((args (teco:get-two-text-args))
+ (search (car args))
+ (replace (car (cdr args)))
+ regexp)
+ (if (string-equal search "")
+ ;; Retrieve last search string
+ (setq regexp teco:last-search-regexp
+ search (aref teco:qreg-text ?_))
+ ;; Store this search string
+ (setq regexp (teco:parse-search-string search)
+ teco:last-search-regexp regexp)
+ (aset teco:qreg-text ?_ search))
+ (let ((result (re-search-forward regexp nil t)))
+ ;; save result for later ';'
+ (setq teco:search-result (if result -1 0))
+ ;; if no real or implied colon, error if not found
+ (if (and (not result)
+ (not teco:colon-flag)
+ (not (teco:peek-command 59)))
+ (teco:error "SRH"))
+ ;; set return results
+ (if teco:colon-flag
+ (setq teco:exp-flag1 t
+ teco:exp-val1 teco:search-result)
+ (setq teco:exp-flag1 nil))
+ ;; clear other flags
+ (setq teco:exp-flag2 nil
+ teco:colon-flag nil
+ teco:at-flag nil
+ teco:exp-op 'start)
+ (if result
+ (progn
+ ;; delete the match
+ (delete-char (- (match-end 0) (match-beginning 0)))
+ ;; insert the argument
+ (insert replace)
+ ;; set ^S for the insertion
+ (setq teco:ctrl-s (- (length replace))))))))
+
+(defun teco:fw-command ()
+ "Aka fw."
+ (let ((count (teco:get-value 1))
+ (start (point)))
+ ;; argument 0 is a no-op
+ (if (/= count 0)
+ (progn
+ (forward-word count)
+ ;; If : is present, back off to the near side of the last word
+ ;; found. Make sure we don't run past the starting position.
+ (if teco:colon-flag
+ (if (> count 0)
+ ;; Searching forward
+ (progn
+ (forward-word -1)
+ (if (< (point) start)
+ (goto-char start)))
+ ;; Searching backward
+ (progn
+ (forward-word 1)
+ (if (> (point) start)
+ (goto-char start)))))))
+ ;; get the result values into the arguments
+ (setq teco:exp-val2 start
+ teco:exp-flag2 t
+ teco:exp-val1 (point)
+ teco:exp-flag1 t
+ teco:colon-flag nil)
+ ;; don't move the point
+ (goto-char start)))
+
+;; Routines to get next character from command buffer
+;; getcmdc0, when reading beyond command string, pops
+;; macro stack and continues.
+;; getcmdc, in similar circumstances, reports an error.
+;; If pushcmdc() has returned any chars, read them first
+;; routines type characters as read, if argument != 0.
+
+(defun teco:get-command0 (trace)
+ "Get the next character TRACE."
+ (let (char)
+ (while (not (condition-case nil
+ (setq char (aref teco:command-string teco:command-pointer))
+ ;; if we've exhausted the string, pop the macro stack
+ ;; if we exhaust the macro stack, exit
+ (error (teco:pop-macro-stack)
+ nil))))
+ ;; bump the command pointer
+ (setq teco:command-pointer (1+ teco:command-pointer))
+ ;; trace, if requested
+ (and trace (teco:trace-type char))
+ ;; return the character
+ char))
+
+(defun teco:get-command (trace)
+ "Get the next character TRACE."
+ (let ((char (condition-case nil
+ (aref teco:command-string teco:command-pointer)
+ ;; if we've exhausted the string, give error
+ (error
+ (teco:error (if teco:macro-stack "UTM" "UTC"))))))
+ ;; bump the command pointer
+ (setq teco:command-pointer (1+ teco:command-pointer))
+ ;; trace, if requested
+ (and trace (teco:trace-type char))
+ ;; return the character
+ char))
+
+;; peek at next char in command string, return 1 if it is equal
+;; (case independent) to argument
+
+(defun teco:peek-command (arg)
+ (condition-case nil
+ (eq (aref teco:mapch-l (aref teco:command-string teco:command-pointer))
+ (aref teco:mapch-l arg))
+ (error nil)))
+
+(defun teco:get-text-arg (&optional term-char default-term-char)
+ ;; figure out what the terminating character is
+ (setq teco:term-char (or term-char
+ (if teco:at-flag
+ (teco:get-command teco:trace)
+ (or default-term-char
+ ?\e)))
+ teco:at-flag nil)
+ (let ((s "")
+ c)
+ (while (progn
+ (setq c (teco:get-command teco:trace))
+ (/= c teco:term-char))
+ (setq s (concat s (char-to-string c))))
+ s))
+
+(defun teco:get-two-text-args (&optional term-char default-term-char)
+ ;; figure out what the terminating character is
+ (setq teco:term-char (or term-char
+ (if teco:at-flag
+ (teco:get-command teco:trace)
+ (or default-term-char
+ ?\e)))
+ teco:at-flag nil)
+ (let ((s1 "")
+ (s2 "")
+ c)
+ (while (progn
+ (setq c (teco:get-command teco:trace))
+ (/= c teco:term-char))
+ (setq s1 (concat s1 (char-to-string c))))
+ (while (progn
+ (setq c (teco:get-command teco:trace))
+ (/= c teco:term-char))
+ (setq s2 (concat s2 (char-to-string c))))
+ (list s1 s2)))
+
+;; Routines to manipulate the stacks
+
+;; Pop the macro stack. Throw to 'teco:exit' if the stack is empty.
+(defun teco:pop-macro-stack ()
+ (if teco:macro-stack
+ (let ((frame (car teco:macro-stack)))
+ (setq teco:macro-stack (cdr teco:macro-stack)
+ teco:command-string (aref frame 0)
+ teco:command-pointer (aref frame 1)
+ teco:iteration-stack (aref frame 2)
+ teco:cond-stack (aref frame 3)
+ teco:at-flag nil))
+ (throw 'teco:exit nil)))
+
+;; Push the macro stack.
+(defun teco:push-macro-stack ()
+ (setq teco:macro-stack
+ (cons (vector teco:command-string
+ teco:command-pointer
+ teco:iteration-stack
+ teco:cond-stack)
+ teco:macro-stack)))
+
+;; Pop the expression stack.
+(defun teco:pop-exp-stack ()
+ (let ((frame (car teco:exp-stack)))
+ (setq teco:exp-stack (cdr teco:exp-stack)
+ teco:exp-val1 (aref frame 0)
+ teco:exp-flag1 (aref frame 1)
+ teco:exp-val2 (aref frame 2)
+ teco:exp-flag2 (aref frame 3)
+ teco:exp-exp (aref frame 4)
+ teco:exp-op (aref frame 5))))
+
+;; Push the expression stack.
+(defun teco:push-exp-stack ()
+ (setq teco:exp-stack
+ (cons (vector teco:exp-val1
+ teco:exp-flag1
+ teco:exp-val2
+ teco:exp-flag2
+ teco:exp-exp
+ teco:exp-op)
+ teco:exp-stack)))
+
+;; Pop the iteration stack
+;; if arg t, exit unconditionally
+;; else check exit conditions and exit or reiterate
+(defun teco:pop-iter-stack (arg)
+ (let ((frame (car teco:iteration-stack)))
+ (if (or arg
+ (and ;; without argument, iterate indefinitely
+ (aref frame 1)
+ ;; test against 1, since one iteration has already been done
+ (<= (aref frame 2) 1)))
+ ;; exit iteration
+ (setq teco:iteration-stack (cdr teco:iteration-stack))
+ ;; continue with iteration
+ ;; decrement count
+ (and (aref frame 1)
+ (aset frame 2 (1- (aref frame 2))))
+ ;; reset command pointer
+ (setq teco:command-pointer (aref frame 0)))))
+
+;; Push the iteration stack
+(defun teco:push-iter-stack (pointer flag count)
+ (setq teco:iteration-stack
+ (cons (vector pointer
+ flag
+ count)
+ teco:iteration-stack)))
+
+(defun teco:find-enditer ()
+ (let ((icnt 1)
+ c)
+ (while (> icnt 0)
+ (while (progn (setq c (teco:skipto))
+ (and (/= c ?<)
+ (/= c ?>))))
+ (if (= c ?<)
+ (setq icnt (1+ icnt))
+ (setq icnt (1- icnt))))))
+
+
+;; I/O routines
+
+(defvar teco:output-buffer (get-buffer-create "*Teco Output*")
+ "The buffer into which Teco output is written.")
+
+(defun teco:out-init ()
+ "Recreate the teco output buffer, if necessary."
+ (setq teco:output-buffer (get-buffer-create "*Teco Output*"))
+ (with-current-buffer teco:output-buffer
+ ;; get a fresh line in output buffer
+ (goto-char (point-max))
+ (insert ?\n)
+ ;; remember where to start displaying
+ (setq teco:output-start (point))
+ ;; clear minibuffer, in case we have to display in it
+ (save-window-excursion
+ (select-window (minibuffer-window))
+ (erase-buffer))
+ ;; if output is visible, position it correctly
+ (let ((w (get-buffer-window teco:output-buffer)))
+ (if w
+ (progn
+ (set-window-start w teco:output-start)
+ (set-window-point w teco:output-start))))))
+
+(defun teco:output (s)
+ ;; Do no work if output is "". Also, this avoids an error condition.
+ (if (not (and (stringp s) (string-equal s "")))
+ (let ((w (get-buffer-window teco:output-buffer))
+ (b (current-buffer))
+ (sw (selected-window)))
+ ;; Put the text in the output buffer
+ (set-buffer teco:output-buffer)
+ (goto-char (point-max))
+ (insert s)
+ (let ((p (point)))
+ (set-buffer b)
+ (if w
+ ;; if output is visible, move the window point to the end
+ (set-window-point w p)
+ ;; Otherwise, we have to figure out how to display the text
+ ;; Has a newline followed by another character been added to the
+ ;; output buffer? If so, we have to make the output buffer
+ ;; visible.
+ (if (with-current-buffer teco:output-buffer
+ (backward-char 1)
+ (search-backward "\n" teco:output-start t))
+ ;; a newline has been seen, clear the minibuffer and make the
+ ;; output buffer visible
+ (progn
+ (save-window-excursion
+ (select-window (minibuffer-window))
+ (erase-buffer))
+ (let ((pop-up-windows t))
+ (pop-to-buffer teco:output-buffer)
+ (goto-char p)
+ (set-window-start w teco:output-start)
+ (set-window-point w p)
+ (select-window sw)))
+ ;; a newline has not been seen, add output to minibuffer
+ (save-window-excursion
+ (select-window (minibuffer-window))
+ (goto-char (point-max))
+ (insert s))))))))
+
+;; Output a character of tracing information
+(defun teco:trace-type (c)
+ (teco:output (if (= c ?\e)
+ ?$
+ c)))
+
+;; Report an error
+(defun teco:error (code)
+ ;; save the command with the error
+ (aset teco:qreg-text ?%
+ (substring teco:command-string 0 teco:command-pointer))
+ (let ((text (cdr (assoc code teco:error-texts))))
+ (teco:output (concat (if (with-current-buffer teco:output-buffer
+ (/= (point) teco:output-start))
+ "\n"
+ "")
+ ;; due to the test in teco:output and Emacs' handling
+ ;; of trailing newlines in the minibuffer-window,
+ ;; we can have a newline at the end of the error
+ ;; message and it will not force the output display
+ ;; from the minibuffer into the Teco output buffer
+ "? " code " " text "\n"))
+ (beep)
+ (if debug-on-error (debug nil code text))
+ (throw 'teco:exit nil)))
+
+
+;; Utility routines
+
+;; Convert character to q-register name
+;; If file-or-search is t, allow special q-reg names
+(defun teco:get-qspec (file-or-search char)
+ ;; lower-case char
+ (setq char (aref teco:mapch-l char))
+ ;; test that it's valid
+ (if (= (logand (aref teco:qspec-valid char) (if file-or-search 2 1)) 0)
+ (teco:error "IQN"))
+ char)
+
+;; Set or get value of a variable
+(defun teco:set-var (variable)
+ ;; If there is an argument, then set the variable
+ (if teco:exp-flag1
+ (progn
+ (set variable
+ (if teco:exp-flag2
+ ;; If there are two arguments, then they are bits to clear
+ ;; and bits to set
+ (logior (logand (lognot (symbol-value variable))
+ teco:exp-val2)
+ teco:exp-val1)
+ ;; One argument is the new value alone
+ teco:exp-val1))
+ (setq teco:exp-flag1 nil
+ teco:exp-flag2 nil))
+ ;; No arguments mean to fetch the variable's value
+ (setq teco:exp-val1 (symbol-value variable)
+ teco:exp-flag1 t)))
+
+;; Get numeric argument
+(defun teco:get-value (default)
+ (prog1
+ (if teco:exp-flag1
+ teco:exp-val1
+ (if (eq teco:exp-op 'sub)
+ (- default)
+ default))
+ ;; consume argument
+ (setq teco:exp-flag1 nil
+ teco:exp-op 'start)))
+
+;; Get argument measuring in lines
+(defun teco:lines (r)
+ (- (save-excursion
+ (if (> r 0)
+ (if (search-forward "\n" nil t r)
+ (point)
+ (point-max))
+ (if (search-backward "\n" nil t (- 1 r))
+ (1+ (point))
+ (point-min))))
+ (point)))
+
+;; routine to handle args for K, T, X, etc.
+;; if two args, 'char x' to 'char y'
+;; if just one arg, then n lines (default 1)
+(defun teco:line-args ()
+ (prog1
+ (if teco:exp-flag2
+ (cons teco:exp-val1 teco:exp-val2)
+ (cons (point) (+ (point) (teco:lines (if teco:exp-flag1
+ teco:exp-val1
+ 1)))))
+ (setq teco:exp-flag1 nil
+ teco:exp-flag2 nil)))
+
+;; routine to skip to next ", ', |, <, or >
+;; skips over these chars embedded in text strings
+;; stops in ! if argument is t
+;; returns character found
+(defun teco:skipto (&optional arg)
+ (catch 'teco:skip
+ (let (;; "at" prefix
+ (atsw nil)
+ ;; temp attributes
+ ta
+ ;; terminator
+ term
+ skipc)
+ (while t ; forever
+ (while (progn
+ (setq skipc (teco:get-command nil)
+ ta (aref teco:spec-chars skipc))
+ (cond
+ ;; if char is ^, treat next char as control
+ ((eq skipc ?^)
+ (setq skipc (logand 31 (teco:get-command nil))
+ ta (aref teco:spec-chars skipc)))
+ ;; if char is E or F, pick up next char and interpret the
+ ;; two-character sequence
+ ((eq skipc ?e)
+ (setq skipc (teco:get-command nil)
+ ta (logand -259 (aref teco:spec-chars skipc)))
+ (if (/= (logand ta 4) 0)
+ (setq ta (logior ta 2))))
+ ((eq skipc ?f)
+ (setq skipc (teco:get-command nil)
+ ta (logand -259 (aref teco:spec-chars skipc)))
+ (if (/= (logand ta 8) 0)
+ (setq ta (logior ta 2)))
+ (if (/= (logand ta 512) 0)
+ (setq ta (logior ta 256)))))
+ (= (logand ta 307) 0)) ; read until something
interesting
+ ; found
+ nil)
+ (if (/= (logand ta 32) 0)
+ (teco:get-command nil)) ; if command takes a Q spec,
+ ; skip the spec
+ (if (/= (logand ta 16) 0) ; sought char found: quit
+ (progn
+ (if (= skipc ?\") ; quote must skip next char
+ (teco:get-command nil))
+ (throw 'teco:skip skipc)))
+ (if (/= (logand ta 1) 0) ; other special char
+ (cond
+ ((eq skipc ?@) ; use alternative text terminator
+ (setq atsw t))
+ ((eq skipc ?\C-^) ; ^^ is value of next char
+ ; skip that char
+ (teco:get-command nil))
+ ((eq skipc ?\C-a) ; type text
+ (setq term (if atsw (teco:get-command nil) ?\C-a)
+ atsw nil)
+ (while (/= (teco:get-command nil) term)
+ nil)) ; skip text
+ ((eq skipc ?!) ; tag
+ (if arg
+ (throw 'teco:skip skipc))
+ (while (/= (teco:get-command nil) ?!)
+ nil)) ; skip until next !
+ ((or (eq skipc ?e)
+ (eq skipc ?f)) ; first char of two-letter E or F
+ ; command
+ nil))) ; not implemented
+ (if (/= (logand ta 2) 0) ; command with a text
+ ; argument
+ (progn
+ (setq term (if atsw (teco:get-command nil) ?\e)
+ atsw nil)
+ (while (/= (teco:get-command nil) term)
+ nil) ; skip text
+ ))
+ (if (/= (logand ta 256) 0) ; command with a double text
+ ; argument
+ (progn
+ (setq term (if atsw (teco:get-command nil) ?\e)
+ atsw nil)
+ (while (/= (teco:get-command nil) term)
+ nil) ; skip text
+ (while (/= (teco:get-command nil) term)
+ nil) ; skip second text
+ (if (/= (logand ta 1024) 0)
+ (setq atsw nil)) ; transfer command clears @-flag
+ ; after executing
+ ))))))
+
+
+;; Input handling
+
+(defvar teco:command-keymap
+ (list 'keymap (make-vector 128 'teco:command-self-insert))
+ "Keymap used while reading teco commands.")
+
+(define-key teco:command-keymap "\^c" 'teco:command-quit)
+(define-key teco:command-keymap "\^g" 'teco:command-quit)
+(define-key teco:command-keymap "\^l" 'teco:command-ctrl-l)
+(define-key teco:command-keymap "\^m" 'teco:command-return)
+(define-key teco:command-keymap "\^u" 'teco:command-ctrl-u)
+(define-key teco:command-keymap "\e" 'teco:command-escape)
+(define-key teco:command-keymap "\^?" 'teco:command-delete)
+(define-key teco:command-keymap "?" 'teco:command-query)
+(define-key teco:command-keymap "/" 'teco:command-slash)
+(define-key teco:command-keymap "*" 'teco:command-star)
+
+(defvar teco:command-display-table
+ (let ((table (make-display-table)))
+ (aset table ?\e [?$])
+ table)
+ "Display table used while reading teco commands.")
+
+(defun teco:copy-to-q-reg (char start end)
+ "Copy region into Teco q-reg REG.
+When called from program, takes three args: REG, START, and END.
+START and END are buffer positions indicating what to copy."
+ (interactive "cCopy region to q-reg: \nr")
+ (setq char (aref teco:mapch-l char))
+ ;; test that it's valid
+ (if (= (logand (aref teco:qspec-valid char) 1) 0)
+ (error "? IQN Invalid Q-reg name"))
+ (aset teco:qreg-text char (buffer-substring start end)))
+
+(defun teco:command ()
+ "Read and execute a Teco command string."
+ (interactive)
+ (let ((command (teco:read-command)))
+ (if command
+ (progn
+ (setq teco:output-buffer (get-buffer-create "*Teco Output*"))
+ (with-current-buffer teco:output-buffer
+ (goto-char (point-max))
+ (insert teco:prompt command))
+ (teco:execute-command command)))))
+(defalias 'teco 'teco:command)
+
+(defun teco:read-command ()
+ "Read a teco command string from the user."
+ (minibuffer-with-setup-hook
+ (lambda ()
+ (setq buffer-display-table teco:command-display-table))
+ (catch 'teco:command-quit
+ (read-from-minibuffer teco:prompt nil teco:command-keymap))))
+
+(defun teco:command-self-insert ()
+ (interactive)
+ (teco:command-insert-character last-command-event))
+
+(defun teco:command-quit ()
+ (interactive)
+ (beep)
+ (throw 'teco:command-quit nil))
+
+(defun teco:command-ctrl-l ()
+ (interactive)
+ (redraw-display))
+
+(defun teco:command-return ()
+ (interactive)
+ (setq last-command-event ?\n)
+ (teco:command-self-insert))
+
+(defun teco:command-escape ()
+ (interactive)
+ ;; Two ESCs in a row terminate the command string
+ (if (eq last-command 'teco:command-escape)
+ (throw 'teco:command-quit (minibuffer-contents-no-properties)))
+ (teco:command-insert-character 27))
+
+(defun teco:command-ctrl-u ()
+ (interactive)
+ ;; delete the characters
+ (kill-line 0)
+ ;; decide whether to shrink the window
+ (while (let ((a (insert ?\n))
+ (b (pos-visible-in-window-p))
+ (c (backward-delete-char 1)))
+ b)
+ (shrink-window 1)))
+
+(defun teco:command-delete ()
+ (interactive)
+ ;; delete the character
+ (backward-delete-char 1)
+ ;; decide whether to shrink the window
+ (insert ?\n)
+ (if (prog1 (pos-visible-in-window-p)
+ (backward-delete-char 1))
+ (shrink-window 1)))
+
+(defun teco:command-query ()
+ (interactive)
+ ;; first input char sees last-command equal to 't
+ (if (eq last-command t)
+ ;; if first character of command, insert erroneous command
+ (let* ((s (aref teco:qreg-text ?%))
+ (l (length s))
+ (i 0))
+ (while (< i l)
+ (teco:command-insert-character (aref s i))
+ (setq i (1+ i))))
+ ;; otherwise, just insert the character
+ (teco:command-self-insert)))
+
+(defun teco:command-slash ()
+ (interactive)
+ ;; first input char sees last-command equal to 't
+ (if (eq last-command t)
+ ;; if first character of command, insert last command
+ (let* ((s (aref teco:qreg-text ?#))
+ (l (length s))
+ (i 0))
+ (while (< i l)
+ (teco:command-insert-character (aref s i))
+ (setq i (1+ i))))
+ ;; otherwise, just insert the character
+ (teco:command-self-insert)))
+
+(defun teco:command-star ()
+ (interactive)
+ ;; first input char sees last-command equal to 't
+ (if (eq last-command t)
+ ;; if first character of command, offer to save previous command in
+ ;; q-register
+ (progn
+ ;; insert the * into the buffer
+ (teco:command-insert-character last-command-event)
+ ;; read the next character
+ (let ((c (read-char))
+ c1)
+ ;; test if it is a valid q-reg name
+ (setq c1 (aref teco:mapch-l c))
+ (if (/= (logand (aref teco:qspec-valid c1) 1) 0)
+ ;; if so, store the command, give a message, and abort command
+ (progn
+ (aset teco:qreg-text c1 (aref teco:qreg-text ?#))
+ (message "Last Teco command stored in q-register %c" c1)
+ (throw 'teco:command-quit nil))
+ ;; if q-reg name is invalid, just insert the character
+ (beep)
+ (teco:command-insert-character c))))
+ ;; otherwise, just insert the character
+ (teco:command-self-insert)))
+
+;; Insert a single command character
+(defun teco:command-insert-character (c)
+ (insert c)
+ (if (not (pos-visible-in-window-p))
+ (enlarge-window 1)))
+
+(provide 'teco)
+;;; teco.el ends here
