0
|
1 <!doctype html>
|
|
2
|
|
3 <title>CodeMirror: Simple Mode Demo</title>
|
|
4 <meta charset="utf-8"/>
|
|
5 <link rel=stylesheet href="../doc/docs.css">
|
|
6
|
|
7 <link rel="stylesheet" href="../lib/codemirror.css">
|
|
8 <script src="../lib/codemirror.js"></script>
|
|
9 <script src="../addon/mode/simple.js"></script>
|
|
10 <script src="../mode/xml/xml.js"></script>
|
|
11 <style>
|
|
12 .CodeMirror {border: 1px solid silver; margin-bottom: 1em; }
|
|
13 dt { text-indent: -2em; padding-left: 2em; margin-top: 1em; }
|
|
14 dd { margin-left: 1.5em; margin-bottom: 1em; }
|
|
15 dt {margin-top: 1em;}
|
|
16 </style>
|
|
17
|
|
18 <div id=nav>
|
|
19 <a href="https://codemirror.net/5"><h1>CodeMirror</h1><img id=logo src="../doc/logo.png"></a>
|
|
20
|
|
21 <ul>
|
|
22 <li><a href="../index.html">Home</a>
|
|
23 <li><a href="../doc/manual.html">Manual</a>
|
|
24 <li><a href="https://github.com/codemirror/codemirror5">Code</a>
|
|
25 </ul>
|
|
26 <ul>
|
|
27 <li><a class=active href="#">Simple Mode</a>
|
|
28 </ul>
|
|
29 </div>
|
|
30
|
|
31 <article>
|
|
32 <h2>Simple Mode Demo</h2>
|
|
33
|
|
34 <p>The <a href="../addon/mode/simple.js"><code>mode/simple</code></a>
|
|
35 addon allows CodeMirror modes to be specified using a relatively simple
|
|
36 declarative format. This format is not as powerful as writing code
|
|
37 directly against the <a href="../doc/manual.html#modeapi">mode
|
|
38 interface</a>, but is a lot easier to get started with, and
|
|
39 sufficiently expressive for many simple language modes.</p>
|
|
40
|
|
41 <p>This interface is still in flux. It is unlikely to be scrapped or
|
|
42 overhauled completely, so do start writing code against it, but
|
|
43 details might change as it stabilizes, and you might have to tweak
|
|
44 your code when upgrading.</p>
|
|
45
|
|
46 <p>Simple modes (loosely based on
|
|
47 the <a href="https://github.com/mozilla/skywriter/wiki/Common-JavaScript-Syntax-Highlighting-Specification">Common
|
|
48 JavaScript Syntax Highlighting Specification</a>, which never took
|
|
49 off), are state machines, where each state has a number of rules that
|
|
50 match tokens. A rule describes a type of token that may occur in the
|
|
51 current state, and possibly a transition to another state caused by
|
|
52 that token.</p>
|
|
53
|
|
54 <p>The <code>CodeMirror.defineSimpleMode(name, states)</code> method
|
|
55 takes a mode name and an object that describes the mode's states. The
|
|
56 editor below shows an example of such a mode (and is itself
|
|
57 highlighted by the mode shown in it).</p>
|
|
58
|
|
59 <div id="code"></div>
|
|
60
|
|
61 <p>Each state is an array of rules. A rule may have the following properties:</p>
|
|
62
|
|
63 <dl>
|
|
64 <dt><code><strong>regex</strong>: string | RegExp</code></dt>
|
|
65 <dd>The regular expression that matches the token. May be a string
|
|
66 or a regex object. When a regex, the <code>ignoreCase</code> flag
|
|
67 will be taken into account when matching the token. This regex
|
|
68 has to capture groups when the <code>token</code> property is
|
|
69 an array. If it captures groups, it must capture <em>all</em> of the string
|
|
70 (since JS provides no way to find out where a group matched).
|
|
71 Currently negative lookbehind assertion for regex is not supported, regardless of browser support.</dd>
|
|
72 <dt><code><strong>token</strong></code>: string | array<string> | null</dt>
|
|
73 <dd>An optional token style. Multiple styles can be specified by
|
|
74 separating them with dots or spaces. When this property holds an array of token styles,
|
|
75 the <code>regex</code> for this rule must capture a group for each array item.
|
|
76 </dd>
|
|
77 <dt><code><strong>sol</strong></code>: boolean</dt>
|
|
78 <dd>When true, this token will only match at the start of the line.
|
|
79 (The <code>^</code> regexp marker doesn't work as you'd expect in
|
|
80 this context because of limitations in JavaScript's RegExp
|
|
81 API.)</dd>
|
|
82 <dt><code><strong>next</strong>: string</code></dt>
|
|
83 <dd>When a <code>next</code> property is present, the mode will
|
|
84 transfer to the state named by the property when the token is
|
|
85 encountered.</dd>
|
|
86 <dt><code><strong>push</strong>: string</code></dt>
|
|
87 <dd>Like <code>next</code>, but instead replacing the current state
|
|
88 by the new state, the current state is kept on a stack, and can be
|
|
89 returned to with the <code>pop</code> directive.</dd>
|
|
90 <dt><code><strong>pop</strong>: bool</code></dt>
|
|
91 <dd>When true, and there is another state on the state stack, will
|
|
92 cause the mode to pop that state off the stack and transition to
|
|
93 it.</dd>
|
|
94 <dt><code><strong>mode</strong>: {spec, end, persistent}</code></dt>
|
|
95 <dd>Can be used to embed another mode inside a mode. When present,
|
|
96 must hold an object with a <code>spec</code> property that describes
|
|
97 the embedded mode, and an optional <code>end</code> end property
|
|
98 that specifies the regexp that will end the extent of the mode. When
|
|
99 a <code>persistent</code> property is set (and true), the nested
|
|
100 mode's state will be preserved between occurrences of the mode.</dd>
|
|
101 <dt><code><strong>indent</strong>: bool</code></dt>
|
|
102 <dd>When true, this token changes the indentation to be one unit
|
|
103 more than the current line's indentation.</dd>
|
|
104 <dt><code><strong>dedent</strong>: bool</code></dt>
|
|
105 <dd>When true, this token will pop one scope off the indentation
|
|
106 stack.</dd>
|
|
107 <dt><code><strong>dedentIfLineStart</strong>: bool</code></dt>
|
|
108 <dd>If a token has its <code>dedent</code> property set, it will, by
|
|
109 default, cause lines where it appears at the start to be dedented.
|
|
110 Set this property to false to prevent that behavior.</dd>
|
|
111 </dl>
|
|
112
|
|
113 <p>The <code>meta</code> property of the states object is special, and
|
|
114 will not be interpreted as a state. Instead, properties set on it will
|
|
115 be set on the mode, which is useful for properties
|
|
116 like <a href="../doc/manual.html#addon_comment"><code>lineComment</code></a>,
|
|
117 which sets the comment style for a mode. The simple mode addon also
|
|
118 recognizes a few such properties:</p>
|
|
119
|
|
120 <dl>
|
|
121 <dt><code><strong>dontIndentStates</strong>: array<string></code></dt>
|
|
122 <dd>An array of states in which the mode's auto-indentation should
|
|
123 not take effect. Usually used for multi-line comment and string
|
|
124 states.</dd>
|
|
125 </dl>
|
|
126
|
|
127 <script id="modecode">/* Example definition of a simple mode that understands a subset of
|
|
128 * JavaScript:
|
|
129 */
|
|
130
|
|
131 CodeMirror.defineSimpleMode("simplemode", {
|
|
132 // The start state contains the rules that are initially used
|
|
133 start: [
|
|
134 // The regex matches the token, the token property contains the type
|
|
135 {regex: /"(?:[^\\]|\\.)*?(?:"|$)/, token: "string"},
|
|
136 // You can match multiple tokens at once. Note that the captured
|
|
137 // groups must span the whole string in this case
|
|
138 {regex: /(function)(\s+)([a-z$][\w$]*)/,
|
|
139 token: ["keyword", null, "variable-2"]},
|
|
140 // Rules are matched in the order in which they appear, so there is
|
|
141 // no ambiguity between this one and the one above
|
|
142 {regex: /(?:function|var|return|if|for|while|else|do|this)\b/,
|
|
143 token: "keyword"},
|
|
144 {regex: /true|false|null|undefined/, token: "atom"},
|
|
145 {regex: /0x[a-f\d]+|[-+]?(?:\.\d+|\d+\.?\d*)(?:e[-+]?\d+)?/i,
|
|
146 token: "number"},
|
|
147 {regex: /\/\/.*/, token: "comment"},
|
|
148 {regex: /\/(?:[^\\]|\\.)*?\//, token: "variable-3"},
|
|
149 // A next property will cause the mode to move to a different state
|
|
150 {regex: /\/\*/, token: "comment", next: "comment"},
|
|
151 {regex: /[-+\/*=<>!]+/, token: "operator"},
|
|
152 // indent and dedent properties guide autoindentation
|
|
153 {regex: /[\{\[\(]/, indent: true},
|
|
154 {regex: /[\}\]\)]/, dedent: true},
|
|
155 {regex: /[a-z$][\w$]*/, token: "variable"},
|
|
156 // You can embed other modes with the mode property. This rule
|
|
157 // causes all code between << and >> to be highlighted with the XML
|
|
158 // mode.
|
|
159 {regex: /<</, token: "meta", mode: {spec: "xml", end: />>/}}
|
|
160 ],
|
|
161 // The multi-line comment state.
|
|
162 comment: [
|
|
163 {regex: /.*?\*\//, token: "comment", next: "start"},
|
|
164 {regex: /.*/, token: "comment"}
|
|
165 ],
|
|
166 // The meta property contains global information about the mode. It
|
|
167 // can contain properties like lineComment, which are supported by
|
|
168 // all modes, and also directives like dontIndentStates, which are
|
|
169 // specific to simple modes.
|
|
170 meta: {
|
|
171 dontIndentStates: ["comment"],
|
|
172 lineComment: "//"
|
|
173 }
|
|
174 });
|
|
175 </script>
|
|
176
|
|
177 <script>
|
|
178 var sc = document.getElementById("modecode");
|
|
179 var code = document.getElementById("code");
|
|
180 var editor = CodeMirror(code, {
|
|
181 value: (sc.textContent || sc.innerText || sc.innerHTML),
|
|
182 mode: "simplemode"
|
|
183 });
|
|
184 </script>
|
|
185
|
|
186 </article>
|