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swift3-mode-lexer.el
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swift3-mode-lexer.el
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;;; swift3-mode-lexer.el --- Major-mode for Apple's Swift programming language, lexer. -*- lexical-binding: t -*-
;; Copyright (C) 2014-2016 taku0, Chris Barrett, Bozhidar Batsov, Arthur Evstifeev
;; Authors: taku0 (http://github.com/taku0)
;; Chris Barrett <[email protected]>
;; Bozhidar Batsov <[email protected]>
;; Arthur Evstifeev <[email protected]>
;;
;; Version: 2.1.1
;; Package-Requires: ((emacs "24.4"))
;; Keywords: languages swift
;; This file is not part of GNU Emacs.
;; This program is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; Routines for Swift tokens
;; Token is a tuple consists of:
;;
;; - Token type
;; - Token text
;; - Start position (inclusive)
;; - End position (exclusive)
;;; Code:
(declare-function swift3-mode:backward-sexps-until "swift3-mode-indent.el"
(token-types
&optional
stop-at-eol-token-types
stop-at-bol-token-types))
(defun swift3-mode:token (type text start end)
"Construct and returns a token."
(list type text start end))
(defun swift3-mode:token:type (token)
"Return the type of TOKEN."
(nth 0 token))
(defun swift3-mode:token:text (token)
"Return the text of TOKEN."
(nth 1 token))
(defun swift3-mode:token:start (token)
"Return the start position of TOKEN."
(nth 2 token))
(defun swift3-mode:token:end (token)
"Return the end position of TOKEN."
(nth 3 token))
;; Token types is one of the follwing symbols:
;;
;; - prefix-operator (including try, try?, and try!)
;; - postfix-operator
;; - binary-operator (including as, as?, as!, is, =, ., and ->)
;; - identifier (including keywords, numbers, implicit parameters, and unknown tokens)
;; - [
;; - ]
;; - {
;; - }
;; - (
;; - )
;; - ,
;; - ;
;; - implicit-;
;; - < (as an angle bracket)
;; - > (as an angle bracket)
;; - typing-: (colon for supertype declaration or type declaration of let or var)
;; - case-: (colon for case or default label)
;; - : (part of conditional operator, key-value separator, label-statement separator
;; - anonymous-function-parameter-in ("in" after anonymous function parameter)
;; - outside-of-buffer
;;
;; Additionaly, `swift3-mode:backward-token-or-list' may return a parenthesized
;; expression as a token with one of the following types:
;; - ()
;; - []
;; - {}
;; - <>
;;; Syntax table
(defconst swift3-mode:syntax-table
(let ((table (make-syntax-table)))
;; Whitespace characters
;; Word constituents
;; Symbol constituents
(modify-syntax-entry ?_ "_" table)
(modify-syntax-entry ?$ "_" table)
(modify-syntax-entry ?@ "_" table)
(modify-syntax-entry ?# "_" table)
;; Punctuation characters
;;
;; Operators
;; https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/doc/uid/TP40014097-CH30-ID410
;; TODO Unicode operators
;;
;; / and * will be overridden below as comment delimiters
(mapc (lambda (c) (modify-syntax-entry c "." table)) "/=-+!*%<>&|^~?.")
;; Separators
(mapc (lambda (c) (modify-syntax-entry c "." table)) ",;")
;; Parenthesis characters
(modify-syntax-entry ?( "()" table)
(modify-syntax-entry ?) ")(" table)
(modify-syntax-entry ?[ "(]" table)
(modify-syntax-entry ?] ")[" table)
(modify-syntax-entry ?{ "(}" table)
(modify-syntax-entry ?} "){" table)
;; String quotes
(modify-syntax-entry ?\" "\"" table)
(modify-syntax-entry ?` "\"" table)
;; Escape-syntax characters
(modify-syntax-entry ?\\ "\\" table)
;; Character quotes
;; Paired delimiters
;; Expression prefixes
;; Comments
(modify-syntax-entry ?/ ". 124b" table)
(modify-syntax-entry ?* ". 23n" table)
(modify-syntax-entry ?\n "> b" table)
(modify-syntax-entry ?\r "> b" table)
table))
;;; Lexers
(defun swift3-mode:implicit-semi-p ()
"Return t if the cursor is after the end of a statement."
(let
((previous-token (save-excursion
(swift3-mode:backquote-identifier-if-after-dot
(swift3-mode:backward-token-simple))))
(next-token (save-excursion
(swift3-mode:backquote-identifier-if-after-dot
(swift3-mode:forward-token-simple)))))
;; If the cursor is on the empty line, pretend an identifier is the line.
(when (and
(< (swift3-mode:token:end previous-token) (line-beginning-position))
(< (line-end-position) (swift3-mode:token:start next-token)))
(setq next-token (swift3-mode:token 'identifier "" (point) (point))))
(cond
((or
;; Supresses implicit semicolon around binary operators and separators.
(memq (swift3-mode:token:type previous-token)
'(binary-operator \; \, :))
(memq (swift3-mode:token:type next-token)
'(binary-operator \; \, :))
;; Supresses implicit semicolon after try, try?, and try!.
(member (swift3-mode:token:text previous-token)
'("try" "try?" "try!"))
;; Suppress implicit semicolon after open brackets or before close
;; brackets.
(memq (swift3-mode:token:type previous-token) '({ \( \[))
(memq (swift3-mode:token:type next-token) '(} \) \]))
;; Suppress implicit semicolon around keywords that cannot start or end
;; statements.
(member (swift3-mode:token:text previous-token)
'("inout" "throws" "rethrows" "in" "where"))
(member (swift3-mode:token:text next-token)
'("inout" "throws" "rethrows" "in" "where")))
nil)
;; Inserts implicit semicolon around #... directives.
;;
;; Note that we cannot split #if line; the following code is not allowed.
;;
;; #if
;; true
;; #end if
((and
(or
(string-prefix-p "#" (swift3-mode:token:text previous-token))
(string-prefix-p "#" (swift3-mode:token:text next-token)))
(not (member (swift3-mode:token:text previous-token)
'("#file" "#line" "column" "#function")))
(not (member (swift3-mode:token:text next-token)
'("#file" "#line" "column" "#function"))))
t)
;; Suppress implicit semicolon after modifiers.
((member (swift3-mode:token:text previous-token)
'("indirect" "convenience" "dynamic" "final" "infix" "lazy"
"mutating" "nonmutating" "optional" "override" "postfix"
"prefix" "required" "static" "unowned" "weak" "internal"
"private" "public" "open" "fileprivate"))
nil)
;; internal(set) private(set) public(set) open(set) fileprivate(set)
;; unowned(safe) unowned(unsafe)
((and
(eq (swift3-mode:token:type previous-token) '\))
(save-excursion
(and
(eq (swift3-mode:token:type (swift3-mode:backward-token-simple)) '\))
(member (swift3-mode:token:text (swift3-mode:backward-token-simple))
'("set" "safe" "unsafe"))
(eq (swift3-mode:token:type (swift3-mode:backward-token-simple)) '\()
(member (swift3-mode:token:text
(swift3-mode:backquote-identifier-if-after-dot
(swift3-mode:backward-token-simple)))
'("unowned" "internal" "private" "public" "open" "fileprivate")))))
nil)
;; Insert implicit semicolon before modifiers.
;;
;; Preceding mofidiers takes precedence over this.
((member (swift3-mode:token:text next-token)
'("indirect" "convenience" "dynamic" "final" "infix" "lazy"
"mutating" "nonmutating" "optional" "override" "postfix"
"prefix" "required" "static" "unowned" "weak" "internal"
"private" "public" "open" "fileprivate"))
t)
;; Inserts implicit semicolon around keywords that forms single keyword
;; statements.
((or
(member (swift3-mode:token:text previous-token)
'("break" "continue" "fallthrough"))
(member (swift3-mode:token:text next-token)
'("break" "continue" "fallthrough")))
t)
;; Suppress implicit semicolon after keywords that cannot end statements.
((member (swift3-mode:token:text previous-token)
'("while" "for" "switch" "case" "default" "catch" "if" "guard"
"let" "var" "throw" "import" "return"))
nil)
;; Inserts implicit semicolon before keywords that starts a new statement.
((member (swift3-mode:token:text next-token)
'("for" "repeat" "switch" "case" "default" "defer" "do" "if"
"guard" "let" "var" "throw" "import" "return"))
t)
;; Inserts implicit semicolon before `while' unless it is part of
;; `repeat...while'.
((equal (swift3-mode:token:text next-token) "while")
(save-excursion
(not
(and
(eq (swift3-mode:token:type previous-token) '\})
(progn
(backward-list)
(equal (swift3-mode:token:text
(swift3-mode:backquote-identifier-if-after-dot
(swift3-mode:backward-token-simple)))
"repeat"))))))
;; Inserts implicit around else
((or
(equal (swift3-mode:token:text previous-token) "else")
(equal (swift3-mode:token:text next-token) "else"))
t)
;; Supress implicit semicolon after attributes.
((string-prefix-p "@" (swift3-mode:token:text previous-token)) nil)
;; Inserts implicit semicolon before keywords that behave like method
;; names.
((member (swift3-mode:token:text next-token)
'("get" "set" "willSet" "didSet" "subscript" "init" "deinit"))
t)
;; Suppress implicit semicolon after keywords that behave like method
;; names.
;;
;; Note that binary operators take precedence over this:
;;
;; self . // not insert semicolon here
;; init
((member (swift3-mode:token:text previous-token)
'("set" "willSet" "didSet" "subscript" "init" "deinit"))
nil)
;; Suppress implicit semicolon after declaration starters.
((member (swift3-mode:token:text previous-token)
'("class" "struct" "protocol" "enum" "extension" "func" "typealias"
"associatedtype" "precedencegroup" "operator"))
nil)
;; Inserts implicit semicolon before declaration starters.
;; Modifiers take precedence over this.
;;
;; Notes that class-requirement is handled by the `:' rule above:
;;
;; protocol Foo: // not insert semicolon here
;; class
;;
;; `protocol' is handled by the next rule
((member (swift3-mode:token:text next-token)
'("class" "struct" "enum" "extension" "func" "typealias"
"associatedtype" "precedencegroup"))
t)
;; Inserts implicit semicolon before protocol unless it is followed by <.
((equal "protocol" (swift3-mode:token:text next-token))
(not (equal (swift3-mode:token:text
(save-excursion
(swift3-mode:forward-token-simple)
(swift3-mode:forward-token-simple)))
"<")))
;; Inserts implicit semicolon before attributes unless other condtions
;; met.
((string-prefix-p "@" (swift3-mode:token:text previous-token)) t)
;; Inserts implicit semicolon before open square bracket.
;;
;; Open square bracket for array indexing cannot appear at the start of a
;; line.
;; https://github.com/apple/swift/blob/8d4b1cc3c47c7624d57f188d5b227152ccb03163/lib/Parse/ParseExpr.cpp#L1525
;;
;; Note that the following pattern (i.e. after binary-operator) is handled
;; by above case.
;;
;; let x =
;; [
;; 1
;; ]
((eq (swift3-mode:token:type next-token) '\[) t)
;; Inserts implicit semicolon before open parenthesis.
;;
;; Open parenthesis for function arguments cannot appear at the start of a
;; line.
;; https://github.com/apple/swift/blob/8d4b1cc3c47c7624d57f188d5b227152ccb03163/lib/Parse/ParseExpr.cpp#L1251
;;
;; Note that the following pattern (i.e. after binary-operator) is handled
;; by above case.
;;
;; let x =
;; (
;; 1
;; )
((eq (swift3-mode:token:type next-token) '\() t)
;; Inserts semicolon before open curly bracket.
;;
;; Open curly bracket may continue the previous line, but we do not indent
;; there. For example, the code below is parsed as `(foo() { x in ... })'
;; by the Swift compiler, but we indent it like `foo(); { x in ... }'.
;;
;; foo()
;; { // does not indent here
;; x in
;; ...
;; }
((eq (swift3-mode:token:type next-token) '\{) t)
;; Otherwise, inserts implicit semicolon.
(t t))))
(defun swift3-mode:type-colon-p ()
"Return t if a colon at the cursor is the colon for type annotation.
That is supertype declaration or type declaration of let or var."
(save-excursion
(let ((previous-token (swift3-mode:backward-token-simple)))
;; class Foo<T>: Bar ← type colon
;; class Foo<T> : Bar ← type colon
;; class Foo<T where T: Bar<[(Int, String)]>> : Bar ← type colon
;; case Foo: ← not a type colon
;; case Foo where foo: ← not a type colon
;; default: ← not a type colon
;; foo ? bar : baz ← not a type colon
;; [
;; foo: ← not a type colon
;; bar
;; ]
;; foo(bar, baz: baz) ← not a type colon
(or
(eq (swift3-mode:token:type previous-token) '>)
;; class Foo: ← type colon
;; extension Foo: ← type colon
;; let foo: ← type colon
;; var foo: ← type colon
;; protocol Foo {
;; typealias Bar: Baz ← type colon
;; }
(member (swift3-mode:token:text
(swift3-mode:backquote-identifier-if-after-dot
(swift3-mode:backward-token-simple)))
'("class" "extension" "enum" "struct" "protocol" "typealias"
"associatedtype" "let" "var"))))))
(defun swift3-mode:case-colon-p ()
"Return t if a colon at the cursor is the colon for case or default label."
(save-excursion
(member
;; This function can be confused by conditional operator.
;;
;;
;; switch foo {
;; case let x where x is Foo ?
;; a : // This function should return nil but it
;; // actually retuns t.
;; b: // This function should return t but it
;; // actually return nil.
;; let y = a ? b : c // This function returns nil correctly for this.
;; }
;; FIXME: mutual dependency
(swift3-mode:token:text (swift3-mode:backward-sexps-until
'(implicit-\; \; { \( \[ "case" "default" 'case-:)))
'("case" "default"))))
(defun swift3-mode:anonyous-parameter-in-p ()
"Return t if a 'in' token at the cursor is for anonymous function parameters."
(save-excursion
(eq
;; FIXME: mutual dependency
(swift3-mode:token:type (swift3-mode:backward-sexps-until
'(\; { \( \[ "for")))
'{)))
(defun swift3-mode:fix-operator-type (token)
"Return new operator token with proper token type."
;; Operator type (i.e. prefix, postfix, infix) is decided from spaces or
;; comments around the operator.
;; https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/doc/uid/TP40014097-CH30-ID410
;; https://github.com/apple/swift-evolution/blob/master/proposals/0037-clarify-comments-and-operators.md
(let*
((text (swift3-mode:token:text token))
(start (swift3-mode:token:start token))
(end (swift3-mode:token:end token))
(has-preceding-space (or
(= start (point-min))
(memq (char-syntax (char-before start)) '(? ?>))
(nth 4 (save-excursion (syntax-ppss (1- start))))))
(has-following-space (or
(= end (point-max))
(memq (char-syntax (char-after end)) '(? ?<))
(save-excursion (goto-char end)
(looking-at "/\\*\\|//"))
(= (char-after end) ?\C-j)))
(has-following-dot (eq (char-after end) ?.))
(is-declaration (save-excursion
;; i.e.
;; func +++(x1: X, x2: X)
;; or operator declarations.
(goto-char start)
(member
(swift3-mode:token:text
(swift3-mode:backquote-identifier-if-after-dot
(swift3-mode:backward-token-simple)))
'("func" "operator"))))
(type
(cond
(is-declaration 'identifier)
((member text '("try" "try?" "try!")) 'prefix-operator)
((equal text ".") 'binary-operator)
((and has-preceding-space has-following-space) 'binary-operator)
(has-preceding-space 'prefix-operator)
((or has-following-space has-following-dot) 'postfix-operator)
(t 'binary-operator))))
(swift3-mode:token type text start end)))
(defun swift3-mode:backquote-identifier-if-after-dot (token)
"Backquote identifiers including keywords if it is after dot.
See SE-0071:
https://github.com/apple/swift-evolution/blob/master/proposals/0071-member-keywords.md"
(if (and (string-match "^[a-z]" (swift3-mode:token:text token))
(save-excursion
(goto-char (swift3-mode:token:start token))
(equal (swift3-mode:token:text (swift3-mode:backward-token-simple))
".")))
(swift3-mode:token
'identifier
(concat "`" (swift3-mode:token:text token) "`")
(swift3-mode:token:start token)
(swift3-mode:token:end token))
token))
(defun swift3-mode:forward-token ()
"Move point forward to the next position of the end of a token.
Return the token object. If no more tokens available, return a token with
type `out-of-buffer'"
(let ((pos (point)))
(forward-comment (point-max))
(cond
;; Outside of buffer
((eobp)
(swift3-mode:token 'outside-of-buffer "" (point) (point)))
;; Implicit semicolon
((and (< pos
(save-excursion
(swift3-mode:goto-non-comment-bol)
(point)))
(save-excursion (goto-char pos) (swift3-mode:implicit-semi-p)))
(swift3-mode:token 'implicit-\;
(buffer-substring-no-properties pos (point))
pos
(point)))
;; Colon
((eq (char-after) ?:)
(swift3-mode:token (cond
((swift3-mode:type-colon-p) 'typing-:)
((swift3-mode:case-colon-p) 'case-:)
(t ':))
":"
(progn (forward-char) (1- (point)))
(point)))
(t
(let ((token (swift3-mode:forward-token-simple)))
(setq token (swift3-mode:backquote-identifier-if-after-dot token))
(when (and (equal (swift3-mode:token:text token) "in")
(save-excursion
(goto-char (swift3-mode:token:start token))
(swift3-mode:anonyous-parameter-in-p)))
(setq token
(swift3-mode:token
'anonymous-function-parameter-in
"in"
(swift3-mode:token:start token)
(swift3-mode:token:end token))))
token)))))
(defun swift3-mode:forward-token-simple ()
"Like `swift3-mode:forward-token' without recursion, and never produces
`implicit-;' or `type-:'."
(forward-comment (point-max))
(cond
;; Outside of buffer
((eobp)
(swift3-mode:token 'outside-of-buffer "" (point) (point)))
;; Separators and parentheses
((memq (char-after) '(?, ?\; ?\{ ?\} ?\[ ?\] ?\( ?\) ?:))
(forward-char)
(swift3-mode:token (intern (string (char-before)))
(string (char-before))
(1- (point))
(point)))
;; Open angle bracket for type parameters
;;
;; We use a heuristic: spaces are inserted around inequality sign, but not
;; for angle bracket, and a type paramer starts with an upper case
;; character, a square bracket, a parenthesis, or keyword 'protocol'.
((and (eq (char-after) ?<) (looking-at "<\\([[:upper:]\\[[(]\\|protocol\\)"))
(forward-char)
(swift3-mode:token '< "<" (1- (point)) (point)))
;; Close angle bracket for type parameters
;;
;; Close angle bracket follows identifier, a square bracket, a parenthesis,
;; or another another bracket (e.g. Foo<Bar<[(Int, String)]>>)
((and (eq (char-after) ?>)
(save-excursion
;; You know that regular language can be reversed. Thus you may
;; think that `looking-back' reverse the given regexp and scan
;; chars backwards. Nevertheless, `looking' function does not
;; do that. It just repeats `looking-at' with decrementing start
;; position until it succeeds. The document says that it is not
;; recommended to use. So using `skip-chars-backward',
;; `skip-syntax-backward', and `looking-at' here.
(skip-chars-backward "])>")
(skip-syntax-backward "w_")
(looking-at "[[:upper:]_]")))
(forward-char)
(swift3-mode:token '> ">" (1- (point)) (point)))
;; Operator (other than as, try, or is)
;;
;; Operators starts with a dot can contains dots. Other operators cannot
;; contain dots.
;;
;; https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/dot-operator-head
((looking-at "[-/=+!*%<>&|^~?]+\\|[.][-./=+!*%<>&|^~?]*")
(let*
((text (match-string-no-properties 0))
(start (match-beginning 0))
(end (match-end 0)))
(when (string-match ".*/\\*\\|.*//" text)
;; e.g. +++/* */ or +++//
(setq end
(- end
(- (length text) (- (match-end 0) 2))))
(setq text (substring text 0 (- (match-end 0) 2))))
(goto-char end)
(swift3-mode:fix-operator-type
(swift3-mode:token nil text start end))))
;; String and backquoted identifer
((memq (char-after) '(?\" ?`))
(let ((pos-after-comment (point)))
(goto-char (scan-sexps (point) 1))
(swift3-mode:token
'identifier
(buffer-substring-no-properties pos-after-comment (point))
pos-after-comment
(point))))
;; Other tokens including identifers, implicit parameters, keywords, and
;; numbers
(t
(let*
((pos-after-comment (point))
(text
(cond
;; Identifers, implicit parameters, keywords, numbers
;;
;; Note: syntax class _ includes #, @, and $.
((memq (char-syntax (char-after)) '(?w ?_))
(progn (forward-symbol 1)
(buffer-substring-no-properties pos-after-comment (point))))
;; Unknown character type. Treats as a single-letter token.
(t (forward-char) (string (char-before))))))
(cond
((member text '("as" "try"))
;; as?, as!, try?, or try!
(when (member (char-after) '(?? ?!))
(forward-char)
(setq text (concat text (list (char-before)))))
(swift3-mode:token (if (member text '("as" "as?" "as!"))
'binary-operator
'prefix-operator)
text
(- (point) (length text))
(point)))
((equal text "is")
(swift3-mode:token 'binary-operator
text
(- (point) (length text))
(point)))
(t
(swift3-mode:token 'identifer
text
(- (point) (length text))
(point))))))))
(defun swift3-mode:backward-token ()
"Move point backward to the previous position of the end of a token.
Return the token object. If no more tokens available, return a token with
type `out-of-buffer'."
(let ((pos (point)))
(forward-comment (- (point)))
(cond
;; Outside of buffer
((bobp)
(swift3-mode:token 'outside-of-buffer "" (point) (point)))
;; Implicit semicolon
((and (< (save-excursion
(swift3-mode:goto-non-comment-eol)
(point))
pos)
(save-excursion (goto-char pos) (swift3-mode:implicit-semi-p)))
(swift3-mode:token 'implicit-\;
(buffer-substring-no-properties (point) pos)
(point)
pos))
;; Colon
((eq (char-before) ?:)
(backward-char)
(swift3-mode:token (cond
((swift3-mode:type-colon-p) 'typing-:)
((swift3-mode:case-colon-p) 'case-:)
(t ':))
":"
(point)
(1+ (point))))
(t
(let ((token (swift3-mode:backward-token-simple)))
(setq token (swift3-mode:backquote-identifier-if-after-dot token))
(when (and (equal (swift3-mode:token:text token) "in")
(save-excursion
(goto-char (swift3-mode:token:start token))
(swift3-mode:anonyous-parameter-in-p)))
(setq token
(swift3-mode:token
'anonymous-function-parameter-in
"in"
(swift3-mode:token:start token)
(swift3-mode:token:end token))))
token)))))
(defun swift3-mode:backward-token-simple ()
"Like `swift3-mode:backward-token' without recursion, and never produces
`implicit-;' or `type-:'."
(forward-comment (- (point)))
(cond
;; Outside of buffer
((bobp)
(swift3-mode:token 'outside-of-buffer "" (point) (point)))
;; Separators and parentheses
((memq (char-before) '(?, ?\; ?\{ ?\} ?\[ ?\] ?\( ?\) ?:))
(backward-char)
(swift3-mode:token (intern (string (char-after)))
(string (char-after))
(point)
(1+ (point))))
;; >! or >?
((and (memq (char-before) '(?! ??))
(eq (char-before (1- (point))) ?>)
(save-excursion
(backward-char)
(eq (swift3-mode:token:type (swift3-mode:backward-token-simple)) '>)))
(backward-char)
(swift3-mode:token (intern (string (char-after)))
(string (char-after))
(point)
(1+ (point))))
;; Open angle bracket for type parameters
;;
;; We use a heuristic: spaces are inserted around inequality sign, but not
;; for angle bracket, and a type paramer starts with an upper case
;; character, a square bracket, a parenthesis, or keyword `protocol'.
((and (eq (char-before) ?<) (looking-at "\\([[:upper:]\\[[(]\\|protocol\\)"))
(backward-char)
(swift3-mode:token '< "<" (point) (1+ (point))))
;; Close angle bracket for type parameters
;;
;; Close angle bracket follows identifier, a square bracket, a parenthesis,
;; or another another bracket (e.g. Foo<Bar<[(Int, String)]>>)
((and (eq (char-before) ?>)
(save-excursion
(skip-chars-backward "])>")
(skip-syntax-backward "w_")
(looking-at "[[:upper:]_]")))
(backward-char)
(swift3-mode:token '> ">" (point) (1+ (point))))
;; Operator (other than as, try, or is)
;;
;; Operators which starts with a dot can contain other dots. Other operators
;; cannot contain dots.
;;
;; https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/swift/grammar/dot-operator-head
((memq (char-before) '(?. ?- ?/ ?= ?+ ?! ?* ?% ?< ?> ?& ?| ?^ ?~ ??))
(let ((point-before-comments (point)))
(skip-chars-backward "-./=+!*%<>&|^~?")
(cond
((save-excursion
(forward-symbol -1)
(and (looking-at "\\(as\\|try\\)[?!]")
(= point-before-comments (match-end 0))))
;; as?, as!, try?, try!
t)
((looking-at "[.][-./=+!*%<>&|^~?]*")
;; e.g. 1 .++++.++++...+. 1
t)
((and (looking-at "[-/=+!*%<>&|^~?]+")
(<= point-before-comments (match-end 0)))
;; e.g. 1 +++++++++ 1
t)
(t
;; e.g. 1+++++...++++1, that is (1+++++) ...++++ 1
(skip-chars-forward "-/=+!*%<>&|^~?")
(looking-at "[.][-./=+!*%<>&|^~?]*")))
(let*
((start (match-beginning 0))
(end (min point-before-comments (match-end 0)))
(text (substring (match-string-no-properties 0) 0 (- end start))))
(goto-char start)
(swift3-mode:fix-operator-type
(swift3-mode:token nil text start end)))))
;; String and backquoted identifer
((memq (char-before) '(?\" ?`))
(let ((pos-before-comment (point)))
(goto-char (scan-sexps (point) -1))
(swift3-mode:token
'identifier
(buffer-substring-no-properties (point) pos-before-comment)
(point)
pos-before-comment)))
;; Other tokens including identifers, implicit parameters, keywords, and
;; numbers
(t
(let*
((pos-before-comment (point))
(text
(cond
;; Identifers, implicit parameters, keywords, numbers
;;
;; Note: syntax class _ includes #, @, and $.
((memq (char-syntax (char-before)) '(?w ?_))
(progn (forward-symbol -1)
(buffer-substring-no-properties (point) pos-before-comment)))
;; Unknown character type. Treats as a single-letter token.
(t (backward-char) (string (char-after))))))
(cond
((member text '("is" "as"))
(swift3-mode:token 'binary-operator
text
(point)
(+ (point) (length text))))
((equal text "try")
(swift3-mode:token 'prefix-operator
text
(point)
(+ (point) (length text))))
(t
(swift3-mode:token 'identifier
text
(point)
(+ (point) (length text)))))))))
(defun swift3-mode:goto-non-comment-bol ()
"Back to the beginning of line that is not inside a comment."
(beginning-of-line)
(while (nth 4 (syntax-ppss))
;; The cursor is in a comment. Backs to the beginning of the comment.
(goto-char (nth 8 (syntax-ppss)))
(beginning-of-line)))
(defun swift3-mode:goto-non-comment-eol ()
"Proceed to the end of line that is not inside a comment.
If this line ends with a single-line comment, goto just before the comment."
(end-of-line)
(while (nth 4 (syntax-ppss))
;; The cursor is in a comment.
(if (eq (nth 4 (syntax-ppss)) t)
;; This ia a single-line comment
;; Back to the beginning of the comment.
(goto-char (nth 8 (syntax-ppss)))
;; This is a multiline comment
;; Proceed to the end of the comment.
(goto-char (nth 8 (syntax-ppss)))
(forward-comment 1)
(end-of-line))))
(provide 'swift3-mode-lexer)
;;; swift3-mode-lexer.el ends here