Proper nested indentation
[hcoop/domtool2.git] / elisp / domtool-mode.el
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1; Created by Brian Templeton (bpt@hcoop.net)
2; Extended by Adam Chlipala (adamc@hcoop.net)
3
4(eval-when-compile (require 'cl))
5
6(defvar domtool-indent 2)
7
8(defvar domtool-mode-syntax-table
9 (let ((table (make-syntax-table)))
10 (loop for i from ?a to ?z
11 do (modify-syntax-entry i "w" table))
12 (loop for i from ?A to ?Z
13 do (modify-syntax-entry i "w" table))
14 (loop for i from ?0 to ?9
15 do (modify-syntax-entry i "w" table))
16 (mapc
17 (lambda (pair)
18 (loop for ch across (if (stringp (car pair))
19 (car pair)
20 (string (car pair)))
21 do (modify-syntax-entry ch (cadr pair) table)))
22 '((" \t\n\14" " ") ; \14 is ^L
23 (?_ "_")
24 (?* ". 23n")
25 (?\( "()1")
26 (?\) ")(4")
27 (?\" "\"")
28 (?\\ "\\")
29 (?\[ "(]")
30 (?\] ")[")
31 ;; We identify single-line comments using
32 ;; font-lock-syntactic-keywords, because it's easier to
33 ;; recognize documentation comments using the syntax table.
34 (?\{ "(}12b")
35 (?\} "){34b")
36 ("->=<,:;^!&" ".") ; -> => <- = , : ; ^ ! &
37 ))
38 table))
39
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40(defun domtool-syms-re (&rest syms)
41 (concat "\\<" (regexp-opt syms t) "\\>"))
42
43(defconst domtool-types-regexp
44 (domtool-syms-re "proxy_target" "proxy_port" "mod_rewrite_cond_flag" "mod_rewrite_flag" "rewrite_arg" "redirect_code" "autoindex_option" "autoindex_width" "homedir_path" "dnsRecord" "apache_option" "authType" "location" "ssl" "ssl_cert_path" "suexec_flag" "web_node" "aliasTarget" "aliasSource" "email" "emailUser" "mail_node" "dnsKind" "master" "dns_node" "soa" "serial" "your_path" "your_group" "your_user" "group" "user" "node" "your_domain_host" "your_domain" "domain" "host" "ip" "no_newlines" "no_spaces" "bool" "string" "int")
45 "A regexp that matches Domtool types from the standard library.")
46
47(defconst domtool-contexts-regexp
48 (domtool-syms-re "Location" "Vhost" "Domain")
49 "A regexp that matches Domtool contexts from the standard library.")
50
51(defconst domtool-actions-regexp
52 (domtool-syms-re "errorDocument" "scriptAlias" "alias" "proxyPassReverse" "proxyPass" "rewriteLogLevel" "localProxyRewrite" "rewriteBase" "rewriteCond" "rewriteRule" "setEnv" "davFilesystem" "readmeName" "headerName" "unset_indexOptions" "set_indexOptions" "indexOptions" "addDescription" "mailmanWebHost" "dnsDefault" "dnsAlias" "dnsMail" "dnsIP" "nameserver" "dom" "web" "webAt" "relayMail" "handleMail" "dns" "addDefaultCharset" "action" "forceTypeOff" "forceType" "directoryIndex" "unset_options" "set_options" "options" "satisfyAny" "satisfyAll" "denyFrom" "denyFromAll" "allowFrom" "allowFromAll" "orderDenyAllow" "orderAllowDeny" "requireGroup" "requireUser" "requireValidUser" "authUserFile" "authName" "authType" "serverAliasDefault" "serverAlias" "serverAliasHost" "directory" "location" "vhost" "defaultAlias" "aliasDrop" "aliasMulti" "emailAlias" "aliasPrim" "domain")
53 "A regexp that matches Domtool actions from the standard library.")
54
55(defconst domtool-vals-regexp
56 (domtool-syms-re "ornext" "cond_nocase" "env" "skip" "redirectWith" "mimeType" "passthrough" "noescape" "qsappend" "nocase" "nosubreq" "chain" "last" "gone" "forbidden" "redirect" "redir307" "redir305" "redir304" "redir303" "redir302" "redir301" "redir300" "seeother" "permanent" "temp" "xhtml" "versionSort" "trackModified" "suppressSize" "suppressRules" "suppressLastModified" "suppressIcon" "suppressHtmlPreamble" "suppressDescription" "suppressColumnSorting" "scanHtmlTitles" "nameWidth" "ignoreClient" "ignoreCase" "iconWidth" "iconHeight" "iconsAreLinks" "htmlTable" "foldersFirst" "fancyIndexing" "descriptionWidth" "characters" "autofit" "home" "web_node" "default_node" "dnsDefaultA" "dnsNS" "dnsMX" "dnsCNAME" "dnsA" "indexes" "includesNOEXEC" "execCGI" "kerberos" "digest" "basic" "use_cert" "no_ssl" "web_node_to_node" "dropTarget" "addressesTarget" "addressTarget" "catchAllSource" "defaultSource" "userSource" "mail_node_to_node" "noDns" "useDns" "internalMaster" "externalMaster" "dns_node_to_node" "defaultSoa" "soa" "serialConst" "serialAuto" "ip_of_node" "true" "false")
57 "A regexp that matches Domtool vals from the standard library.")
58
59(defconst domtool-env-vars-regexp
60 (domtool-syms-re "Aliases" "DNS" "DocumentRoot" "Group" "MailNodes" "Mailbox" "SSL" "ServerAdmin" "SuExec" "TTL" "User" "WebNodes")
61 "A regexp that matches Domtool env-vars from the standard library.")
62
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63(defvar domtool-font-lock-keywords
64 `(,(concat
65 "\\_<"
66 (regexp-opt '("let" "in" "begin" "end" "with" "where" "extern" "type"
ef18a741 67 "val" "context" "Root")
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68 t)
69 "\\_>")
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70
71 (,domtool-actions-regexp . font-lock-builtin-face)
72 (,domtool-vals-regexp . font-lock-variable-name-face)
73 (,domtool-contexts-regexp . font-lock-constant-face)
74 (,domtool-env-vars-regexp . font-lock-constant-face)
75 (,domtool-types-regexp . font-lock-type-face)
76
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77 ("type[ \t]+\\(\\(\\sw\\|\\s_\\)+\\)" 1 font-lock-type-face)
78 ("val[ \t]+\\(\\(\\sw\\|\\s_\\)+\\)" 1 font-lock-variable-name-face)))
79
80(defvar domtool-font-lock-syntactic-keywords
81 '(("\\(#\\).*\\(\n\\|\\'\\)"
82 (1 "!")
83 (2 "!"))))
84
85(defun domtool-font-lock-syntactic-face-function (state)
86 "Major mode for editing Domtool files."
87 (cond ((nth 3 state) font-lock-string-face)
88 ((eq (nth 7 state) t) font-lock-doc-face)
89 (t font-lock-comment-face)))
90
91(define-derived-mode domtool-mode fundamental-mode "Domtool"
92 ;; For some reason, whatever twiddling `define-derived-mode' does
93 ;; with the syntax table breaks recognition of (*...*) comments. So
94 ;; we need to tell d-d-m to leave our syntax table alone.
95 :syntax-table domtool-mode-syntax-table
96 (set (make-local-variable 'indent-line-function) 'domtool-indent-line)
97 (set (make-local-variable 'font-lock-defaults)
98 '(domtool-font-lock-keywords
99 nil nil nil nil
100 (font-lock-syntactic-keywords
101 . domtool-font-lock-syntactic-keywords)
102 (font-lock-syntactic-face-function
103 . domtool-font-lock-syntactic-face-function))))
104
105(defun domtool-indent-line ()
106 (let ((savep (> (current-column) (current-indentation)))
107 (indent (domtool-calculate-indent)))
108 (cond
109 ((eq indent 'noindent) indent)
110 (savep (save-excursion (indent-line-to indent)))
111 (t (indent-line-to indent)))))
112
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113(defun until-closed (level)
114 (if
115 (re-search-backward "\\_<\\(with\\|where\\|begin\\|end\\)\\_>"
116 nil t)
117 (cond
118 ((string= (match-string 0) "end")
119 (until-closed (+ level 1)))
120 ((= level 0)
121 (current-indentation))
122 (t
123 (until-closed (- level 1))))
124
125 nil))
126
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127(defun domtool-calculate-indent ()
128 (save-excursion
129 (back-to-indentation)
130 (multiple-value-bind (previous-keyword base-indent)
131 (save-excursion
1cbe9174 132 (if (re-search-backward "\\_<\\(with\\|where\\|begin\\|end\\)\\_>"
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133 nil t)
134 (values (match-string 0) (current-indentation))
135 (values nil 0)))
136 (let ((state (syntax-ppss)))
137 (cond
138 ((nth 3 state)
139 'noindent)
140 ((nth 4 state)
141 (domtool-calculate-comment-indent state))
4542571e 142 ((looking-at "\\_<\\(with\\|end\\)\\_>")
1cbe9174 143 (until-closed 0))
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144 ((not previous-keyword)
145 base-indent)
146 ((string= previous-keyword "end")
147 base-indent)
148 (t
149 (+ base-indent domtool-indent)))))))
150
151(defun domtool-calculate-comment-indent (state)
152 (ecase (nth 7 state)
153 ((t) 'noindent)
154 ((syntax-table) 'noindent) ; can't happen
155 ((nil) (let ((start (nth 8 state))
156 (depth 0))
157 (while (> (point) start)
158 (re-search-backward "(\\*\\|\\*)" start t)
159 (if (looking-at "(\\*")
160 (incf depth)
161 (decf depth)))
162 (+ (current-indentation) depth)))))