summaryrefslogtreecommitdiff
path: root/codemirror_ui/lib/CodeMirror-2.3/doc/manual.html
diff options
context:
space:
mode:
Diffstat (limited to 'codemirror_ui/lib/CodeMirror-2.3/doc/manual.html')
-rw-r--r--codemirror_ui/lib/CodeMirror-2.3/doc/manual.html1128
1 files changed, 1128 insertions, 0 deletions
diff --git a/codemirror_ui/lib/CodeMirror-2.3/doc/manual.html b/codemirror_ui/lib/CodeMirror-2.3/doc/manual.html
new file mode 100644
index 0000000..88b2746
--- /dev/null
+++ b/codemirror_ui/lib/CodeMirror-2.3/doc/manual.html
@@ -0,0 +1,1128 @@
+<!doctype html>
+<html>
+ <head>
+ <title>CodeMirror: User Manual</title>
+ <link rel="stylesheet" type="text/css" href="http://fonts.googleapis.com/css?family=Droid+Sans|Droid+Sans:bold"/>
+ <link rel="stylesheet" type="text/css" href="docs.css"/>
+ <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
+ <style>dl dl {margin: 0;}</style>
+ </head>
+ <body>
+
+<h1><span class="logo-braces">{ }</span> <a href="http://codemirror.net/">CodeMirror</a></h1>
+
+<pre class="grey">
+<img src="baboon.png" class="logo" alt="logo"/>/* User manual and
+ reference guide */
+</pre>
+
+<div class="clear"><div class="leftbig blk">
+
+ <h2 id="overview">Overview</h2>
+
+ <p>CodeMirror is a code-editor component that can be embedded in
+ Web pages. The code library provides <em>only</em> the editor
+ component, no accompanying buttons, auto-completion, or other IDE
+ functionality. It does provide a rich API on top of which such
+ functionality can be straightforwardly implemented. See
+ the <a href="#addons">add-ons</a> included in the distribution,
+ and
+ the <a href="https://github.com/jagthedrummer/codemirror-ui">CodeMirror
+ UI</a> project, for reusable implementations of extra features.</p>
+
+ <p>CodeMirror works with language-specific modes. Modes are
+ JavaScript programs that help color (and optionally indent) text
+ written in a given language. The distribution comes with a number
+ of modes (see the <code>mode/</code> directory), and it isn't hard
+ to <a href="#modeapi">write new ones</a> for other languages.</p>
+
+ <h2 id="usage">Basic Usage</h2>
+
+ <p>The easiest way to use CodeMirror is to simply load the script
+ and style sheet found under <code>lib/</code> in the distribution,
+ plus a mode script from one of the <code>mode/</code> directories
+ and a theme stylesheet from <code>theme/</code>. (See
+ also <a href="compress.html">the compression helper</a>.) For
+ example:</p>
+
+ <pre>&lt;script src="lib/codemirror.js">&lt;/script>
+&lt;link rel="stylesheet" href="../lib/codemirror.css">
+&lt;script src="mode/javascript/javascript.js">&lt;/script></pre>
+
+ <p>Having done this, an editor instance can be created like
+ this:</p>
+
+ <pre>var myCodeMirror = CodeMirror(document.body);</pre>
+
+ <p>The editor will be appended to the document body, will start
+ empty, and will use the mode that we loaded. To have more control
+ over the new editor, a configuration object can be passed
+ to <code>CodeMirror</code> as a second argument:</p>
+
+ <pre>var myCodeMirror = CodeMirror(document.body, {
+ value: "function myScript(){return 100;}\n",
+ mode: "javascript"
+});</pre>
+
+ <p>This will initialize the editor with a piece of code already in
+ it, and explicitly tell it to use the JavaScript mode (which is
+ useful when multiple modes are loaded).
+ See <a href="#config">below</a> for a full discussion of the
+ configuration options that CodeMirror accepts.</p>
+
+ <p>In cases where you don't want to append the editor to an
+ element, and need more control over the way it is inserted, the
+ first argument to the <code>CodeMirror</code> function can also
+ be a function that, when given a DOM element, inserts it into the
+ document somewhere. This could be used to, for example, replace a
+ textarea with a real editor:</p>
+
+ <pre>var myCodeMirror = CodeMirror(function(elt) {
+ myTextArea.parentNode.replaceChild(elt, myTextArea);
+}, {value: myTextArea.value});</pre>
+
+ <p>However, for this use case, which is a common way to use
+ CodeMirror, the library provides a much more powerful
+ shortcut:</p>
+
+ <pre>var myCodeMirror = CodeMirror.fromTextArea(myTextArea);</pre>
+
+ <p>This will, among other things, ensure that the textarea's value
+ is updated when the form (if it is part of a form) is submitted.
+ See the <a href="#fromTextArea">API reference</a> for a full
+ description of this method.</p>
+
+ <h2 id="config">Configuration</h2>
+
+ <p>Both the <code>CodeMirror</code> function and
+ its <code>fromTextArea</code> method take as second (optional)
+ argument an object containing configuration options. Any option
+ not supplied like this will be taken
+ from <code>CodeMirror.defaults</code>, an object containing the
+ default options. You can update this object to change the defaults
+ on your page.</p>
+
+ <p>Options are not checked in any way, so setting bogus option
+ values is bound to lead to odd errors.</p>
+
+ <p>These are the supported options:</p>
+
+ <dl>
+ <dt id="option_value"><code>value (string)</code></dt>
+ <dd>The starting value of the editor.</dd>
+
+ <dt id="option_mode"><code>mode (string or object)</code></dt>
+ <dd>The mode to use. When not given, this will default to the
+ first mode that was loaded. It may be a string, which either
+ simply names the mode or is
+ a <a href="http://en.wikipedia.org/wiki/MIME">MIME</a> type
+ associated with the mode. Alternatively, it may be an object
+ containing configuration options for the mode, with
+ a <code>name</code> property that names the mode (for
+ example <code>{name: "javascript", json: true}</code>). The demo
+ pages for each mode contain information about what configuration
+ parameters the mode supports. You can ask CodeMirror which modes
+ and MIME types are loaded with
+ the <code>CodeMirror.listModes</code>
+ and <code>CodeMirror.listMIMEs</code> functions.</dd>
+
+ <dt id="option_theme"><code>theme (string)</code></dt>
+ <dd>The theme to style the editor with. You must make sure the
+ CSS file defining the corresponding <code>.cm-s-[name]</code>
+ styles is loaded (see
+ the <a href="../theme/"><code>theme</code></a> directory in the
+ distribution). The default is <code>"default"</code>, for which
+ colors are included in <code>codemirror.css</code>. It is
+ possible to use multiple theming classes at once—for
+ example <code>"foo bar"</code> will assign both
+ the <code>cm-s-foo</code> and the <code>cm-s-bar</code> classes
+ to the editor.</dd>
+
+ <dt id="option_indentUnit"><code>indentUnit (integer)</code></dt>
+ <dd>How many spaces a block (whatever that means in the edited
+ language) should be indented. The default is 2.</dd>
+
+ <dt id="option_smartIndent"><code>smartIndent (boolean)</code></dt>
+ <dd>Whether to use the context-sensitive indentation that the
+ mode provides (or just indent the same as the line before).
+ Defaults to true.</dd>
+
+ <dt id="option_tabSize"><code>tabSize (integer)</code></dt>
+ <dd>The width of a tab character. Defaults to 4.</dd>
+
+ <dt id="option_indentWithTabs"><code>indentWithTabs (boolean)</code></dt>
+ <dd>Whether, when indenting, the first N*<code>tabSize</code>
+ spaces should be replaced by N tabs. Default is false.</dd>
+
+ <dt id="option_electricChars"><code>electricChars (boolean)</code></dt>
+ <dd>Configures whether the editor should re-indent the current
+ line when a character is typed that might change its proper
+ indentation (only works if the mode supports indentation).
+ Default is true.</dd>
+
+ <dt id="option_autoClearEmptyLines"><code>autoClearEmptyLines (boolean)</code></dt>
+ <dd>When turned on (default is off), this will clear
+ automatically clear lines consisting only of whitespace when the
+ cursor leaves them. This is mostly useful to prevent auto
+ indentation from introducing trailing whitespace in a file.</dd>
+
+ <dt id="option_keyMap"><code>keyMap (string)</code></dt>
+ <dd>Configures the keymap to use. The default
+ is <code>"default"</code>, which is the only keymap defined
+ in <code>codemirror.js</code> itself. Extra keymaps are found in
+ the <a href="../keymap/"><code>keymap</code></a> directory. See
+ the <a href="#keymaps">section on keymaps</a> for more
+ information.</dd>
+
+ <dt id="option_extraKeys"><code>extraKeys (object)</code></dt>
+ <dd>Can be used to specify extra keybindings for the editor,
+ alongside the ones defined
+ by <a href="#option_keyMap"><code>keyMap</code></a>. Should be
+ either null, or a valid <a href="#keymaps">keymap</a> value.</dd>
+
+ <dt id="option_lineWrapping"><code>lineWrapping (boolean)</code></dt>
+ <dd>Whether CodeMirror should scroll or wrap for long lines.
+ Defaults to <code>false</code> (scroll).</dd>
+
+ <dt id="option_lineNumbers"><code>lineNumbers (boolean)</code></dt>
+ <dd>Whether to show line numbers to the left of the editor.</dd>
+
+ <dt id="option_firstLineNumber"><code>firstLineNumber (integer)</code></dt>
+ <dd>At which number to start counting lines. Default is 1.</dd>
+
+ <dt id="option_gutter"><code>gutter (boolean)</code></dt>
+ <dd>Can be used to force a 'gutter' (empty space on the left of
+ the editor) to be shown even when no line numbers are active.
+ This is useful for setting <a href="#setMarker">markers</a>.</dd>
+
+ <dt id="option_fixedGutter"><code>fixedGutter (boolean)</code></dt>
+ <dd>When enabled (off by default), this will make the gutter
+ stay visible when the document is scrolled horizontally.</dd>
+
+ <dt id="option_readOnly"><code>readOnly (boolean)</code></dt>
+ <dd>This disables editing of the editor content by the user. If
+ the special value <code>"nocursor"</code> is given (instead of
+ simply <code>true</code>), focusing of the editor is also
+ disallowed.</dd>
+
+ <dt id="option_onChange"><code>onChange (function)</code></dt>
+ <dd>When given, this function will be called every time the
+ content of the editor is changed. It will be given the editor
+ instance as first argument, and an <code>{from, to, text, next}</code>
+ object containing information about the changes
+ that occurred as second argument. <code>from</code>
+ and <code>to</code> are the positions (in the pre-change
+ coordinate system) where the change started and
+ ended (for example, it might be <code>{ch:0, line:18}</code> if the
+ position is at the beginning of line #19). <code>text</code>
+ is an array of strings representing the text that replaced the changed
+ range (split by line). If multiple changes happened during a single
+ operation, the object will have a <code>next</code> property pointing to
+ another change object (which may point to another, etc).</dd>
+
+ <dt id="option_onCursorActivity"><code>onCursorActivity (function)</code></dt>
+ <dd>Will be called when the cursor or selection moves, or any
+ change is made to the editor content.</dd>
+
+ <dt id="option_onGutterClick"><code>onGutterClick (function)</code></dt>
+ <dd>When given, will be called whenever the editor gutter (the
+ line-number area) is clicked. Will be given the editor instance
+ as first argument, the (zero-based) number of the line that was
+ clicked as second argument, and the raw <code>mousedown</code>
+ event object as third argument.</dd>
+
+ <dt id="option_onFocus"><code>onFocus, onBlur (function)</code></dt>
+ <dd>The given functions will be called whenever the editor is
+ focused or unfocused.</dd>
+
+ <dt id="option_onScroll"><code>onScroll (function)</code></dt>
+ <dd>When given, will be called whenever the editor is
+ scrolled.</dd>
+
+ <dt id="option_onHighlightComplete"><code>onHighlightComplete (function)</code></dt>
+ <dd>Whenever the editor's content has been fully highlighted,
+ this function (if given) will be called. It'll be given a single
+ argument, the editor instance.</dd>
+
+ <dt id="option_onUpdate"><code>onUpdate (function)</code></dt>
+ <dd>Will be called whenever CodeMirror updates its DOM display.</dd>
+
+ <dt id="option_matchBrackets"><code>matchBrackets (boolean)</code></dt>
+ <dd>Determines whether brackets are matched whenever the cursor
+ is moved next to a bracket.</dd>
+
+ <dt id="option_workTime"><code>workTime, workDelay (number)</code></dt>
+ <dd>Highlighting is done by a pseudo background-thread that will
+ work for <code>workTime</code> milliseconds, and then use
+ timeout to sleep for <code>workDelay</code> milliseconds. The
+ defaults are 200 and 300, you can change these options to make
+ the highlighting more or less aggressive.</dd>
+
+ <dt id="option_pollInterval"><code>pollInterval (number)</code></dt>
+ <dd>Indicates how quickly CodeMirror should poll its input
+ textarea for changes. Most input is captured by events, but some
+ things, like IME input on some browsers, doesn't generate events
+ that allow CodeMirror to properly detect it. Thus, it polls.
+ Default is 100 milliseconds.</dd>
+
+ <dt id="option_undoDepth"><code>undoDepth (integer)</code></dt>
+ <dd>The maximum number of undo levels that the editor stores.
+ Defaults to 40.</dd>
+
+ <dt id="option_tabindex"><code>tabindex (integer)</code></dt>
+ <dd>The <a href="http://www.w3.org/TR/html401/interact/forms.html#adef-tabindex">tab
+ index</a> to assign to the editor. If not given, no tab index
+ will be assigned.</dd>
+
+ <dt id="option_autofocus"><code>autofocus (boolean)</code></dt>
+ <dd>Can be used to make CodeMirror focus itself on
+ initialization. Defaults to off.
+ When <a href="#fromTextArea"><code>fromTextArea</code></a> is
+ used, and no explicit value is given for this option, it will
+ inherit the setting from the textarea's <code>autofocus</code>
+ attribute.</dd>
+
+ <dt id="option_dragDrop"><code>dragDrop (boolean)</code></dt>
+ <dd>Controls whether drag-and-drop is enabled. On by default.</dd>
+
+ <dt id="option_onDragEvent"><code>onDragEvent (function)</code></dt>
+ <dd>When given, this will be called when the editor is handling
+ a <code>dragenter</code>, <code>dragover</code>,
+ or <code>drop</code> event. It will be passed the editor instance
+ and the event object as arguments. The callback can choose to
+ handle the event itself, in which case it should
+ return <code>true</code> to indicate that CodeMirror should not
+ do anything further.</dd>
+
+ <dt id="option_onKeyEvent"><code>onKeyEvent (function)</code></dt>
+ <dd>This provides a rather low-level hook into CodeMirror's key
+ handling. If provided, this function will be called on
+ every <code>keydown</code>, <code>keyup</code>,
+ and <code>keypress</code> event that CodeMirror captures. It
+ will be passed two arguments, the editor instance and the key
+ event. This key event is pretty much the raw key event, except
+ that a <code>stop()</code> method is always added to it. You
+ could feed it to, for example, <code>jQuery.Event</code> to
+ further normalize it.<br>This function can inspect the key
+ event, and handle it if it wants to. It may return true to tell
+ CodeMirror to ignore the event. Be wary that, on some browsers,
+ stopping a <code>keydown</code> does not stop
+ the <code>keypress</code> from firing, whereas on others it
+ does. If you respond to an event, you should probably inspect
+ its <code>type</code> property and only do something when it
+ is <code>keydown</code> (or <code>keypress</code> for actions
+ that need character data).</dd>
+ </dl>
+
+ <h2 id="keymaps">Keymaps</h2>
+
+ <p>Keymaps are ways to associate keys with functionality. A keymap
+ is an object mapping strings that identify the keys to functions
+ that implement their functionality.</p>
+
+ <p>Keys are identified either by name or by character.
+ The <code>CodeMirror.keyNames</code> object defines names for
+ common keys and associates them with their key codes. Examples of
+ names defined here are <code>Enter</code>, <code>F5</code>,
+ and <code>Q</code>. These can be prefixed
+ with <code>Shift-</code>, <code>Cmd-</code>, <code>Ctrl-</code>,
+ and <code>Alt-</code> (in that order!) to specify a modifier. So
+ for example, <code>Shift-Ctrl-Space</code> would be a valid key
+ identifier.</p>
+
+ <p>Alternatively, a character can be specified directly by
+ surrounding it in single quotes, for example <code>'$'</code>
+ or <code>'q'</code>. Due to limitations in the way browsers fire
+ key events, these may not be prefixed with modifiers.</p>
+
+ <p>The <code>CodeMirror.keyMap</code> object associates keymaps
+ with names. User code and keymap definitions can assign extra
+ properties to this object. Anywhere where a keymap is expected, a
+ string can be given, which will be looked up in this object. It
+ also contains the <code>"default"</code> keymap holding the
+ default bindings.</p>
+
+ <p>The values of properties in keymaps can be either functions of
+ a single argument (the CodeMirror instance), or strings. Such
+ strings refer to properties of the
+ <code>CodeMirror.commands</code> object, which defines a number of
+ common commands that are used by the default keybindings, and maps
+ them to functions. A key handler function may throw
+ <code>CodeMirror.Pass</code> to indicate that it has decided not
+ to handle the key, and other handlers (or the default behavior)
+ should be given a turn.</p>
+
+ <p>Keys mapped to command names that start with the
+ characters <code>"go"</code> (which should be used for
+ cursor-movement actions) will be fired even when an
+ extra <code>Shift</code> modifier is present (i.e. <code>"Up":
+ "goLineUp"</code> matches both up and shift-up). This is used to
+ easily implement shift-selection.</p>
+
+ <p>Keymaps can defer to each other by defining
+ a <code>fallthrough</code> property. This indicates that when a
+ key is not found in the map itself, one or more other maps should
+ be searched. It can hold either a single keymap or an array of
+ keymaps.</p>
+
+ <p>When a keymap contains a <code>nofallthrough</code> property
+ set to <code>true</code>, keys matched against that map will be
+ ignored if they don't match any of the bindings in the map (no
+ further child maps will be tried, and the default effect of
+ inserting a character will not occur).</p>
+
+ <h2 id="styling">Customized Styling</h2>
+
+ <p>Up to a certain extent, CodeMirror's look can be changed by
+ modifying style sheet files. The style sheets supplied by modes
+ simply provide the colors for that mode, and can be adapted in a
+ very straightforward way. To style the editor itself, it is
+ possible to alter or override the styles defined
+ in <a href="../lib/codemirror.css"><code>codemirror.css</code></a>.</p>
+
+ <p>Some care must be taken there, since a lot of the rules in this
+ file are necessary to have CodeMirror function properly. Adjusting
+ colors should be safe, of course, and with some care a lot of
+ other things can be changed as well. The CSS classes defined in
+ this file serve the following roles:</p>
+
+ <dl>
+ <dt id="class_CodeMirror"><code>CodeMirror</code></dt>
+ <dd>The outer element of the editor. This should be used for
+ borders and positioning. Can also be used to set styles that
+ should hold for everything inside the editor (such as font
+ and font size), or to set a background.</dd>
+
+ <dt id="class_CodeMirror_scroll"><code>CodeMirror-scroll</code></dt>
+ <dd>This determines whether the editor scrolls (<code>overflow:
+ auto</code> + fixed height). By default, it does. Giving
+ this <code>height: auto; overflow: visible;</code> will cause
+ the editor to resize to fit its content.</dd>
+
+ <dt id="class_CodeMirror_focused"><code>CodeMirror-focused</code></dt>
+ <dd>Whenever the editor is focused, the top element gets this
+ class. This is used to hide the cursor and give the selection a
+ different color when the editor is not focused.</dd>
+
+ <dt id="class_CodeMirror_gutter"><code>CodeMirror-gutter</code></dt>
+ <dd>Use this for giving a background or a border to the editor
+ gutter. Don't set any padding here,
+ use <code>CodeMirror-gutter-text</code> for that. By default,
+ the gutter is 'fluid', meaning it will adjust its width to the
+ maximum line number or line marker width. You can also set a
+ fixed width if you want.</dd>
+
+ <dt id="class_CodeMirror_gutter_text"><code>CodeMirror-gutter-text</code></dt>
+ <dd>Used to style the actual line numbers. For the numbers to
+ line up, you must make sure that the font in the gutter is the
+ same as the one in the rest of the editor, so you should
+ probably only set font style and size in
+ the <code>CodeMirror</code> class.</dd>
+
+ <dt id="class_CodeMirror_lines"><code>CodeMirror-lines</code></dt>
+ <dd>The visible lines. If this has vertical
+ padding, <code>CodeMirror-gutter</code> should have the same
+ padding.</dd>
+
+ <dt id="class_CodeMirror_cursor"><code>CodeMirror-cursor</code></dt>
+ <dd>The cursor is a block element that is absolutely positioned.
+ You can make it look whichever way you want.</dd>
+
+ <dt id="class_CodeMirror_selected"><code>CodeMirror-selected</code></dt>
+ <dd>The selection is represented by <code>span</code> elements
+ with this class.</dd>
+
+ <dt id="class_CodeMirror_matchingbracket"><code>CodeMirror-matchingbracket</code>,
+ <code>CodeMirror-nonmatchingbracket</code></dt>
+ <dd>These are used to style matched (or unmatched) brackets.</dd>
+ </dl>
+
+ <p>The actual lines, as well as the cursor, are represented
+ by <code>pre</code> elements. By default no text styling (such as
+ bold) that might change line height is applied. If you do want
+ such effects, you'll have to give <code>CodeMirror pre</code> a
+ fixed height.</p>
+
+ <p>If your page's style sheets do funky things to
+ all <code>div</code> or <code>pre</code> elements (you probably
+ shouldn't do that), you'll have to define rules to cancel these
+ effects out again for elements under the <code>CodeMirror</code>
+ class.</p>
+
+ <p>Themes are also simply CSS files, which define colors for
+ various syntactic elements. See the files in
+ the <a href="../theme/"><code>theme</code></a> directory.</p>
+
+ <h2 id="api">Programming API</h2>
+
+ <p>A lot of CodeMirror features are only available through its API.
+ This has the disadvantage that you need to do work to enable them,
+ and the advantage that CodeMirror will fit seamlessly into your
+ application.</p>
+
+ <p>Whenever points in the document are represented, the API uses
+ objects with <code>line</code> and <code>ch</code> properties.
+ Both are zero-based. CodeMirror makes sure to 'clip' any positions
+ passed by client code so that they fit inside the document, so you
+ shouldn't worry too much about sanitizing your coordinates. If you
+ give <code>ch</code> a value of <code>null</code>, or don't
+ specify it, it will be replaced with the length of the specified
+ line.</p>
+
+ <dl>
+ <dt id="getValue"><code>getValue() → string</code></dt>
+ <dd>Get the current editor content.</dd>
+ <dt id="setValue"><code>setValue(string)</code></dt>
+ <dd>Set the editor content.</dd>
+
+ <dt id="getSelection"><code>getSelection() → string</code></dt>
+ <dd>Get the currently selected code.</dd>
+ <dt id="replaceSelection"><code>replaceSelection(string)</code></dt>
+ <dd>Replace the selection with the given string.</dd>
+
+ <dt id="focus"><code>focus()</code></dt>
+ <dd>Give the editor focus.</dd>
+ <dt id="scrollTo"><code>scrollTo(x, y)</code></dt>
+ <dd>Scroll the editor to a given (pixel) position. Both
+ arguments may be left as <code>null</code>
+ or <code>undefined</code> to have no effect.</dd>
+ <dt id="getScrollInfo"><code>getScrollInfo()</code></dt>
+ <dd>Get an <code>{x, y, width, height}</code> object that
+ represents the current scroll position and scrollable area size
+ of the editor.</dd>
+
+ <dt id="setOption"><code>setOption(option, value)</code></dt>
+ <dd>Change the configuration of the editor. <code>option</code>
+ should the name of an <a href="#config">option</a>,
+ and <code>value</code> should be a valid value for that
+ option.</dd>
+ <dt id="getOption"><code>getOption(option) → value</code></dt>
+ <dd>Retrieves the current value of the given option for this
+ editor instance.</dd>
+
+ <dt id="cursorCoords"><code>cursorCoords(start, mode) → object</code></dt>
+ <dd>Returns an <code>{x, y, yBot}</code> object containing the
+ coordinates of the cursor. If <code>mode</code>
+ is <code>"local"</code>, they will be relative to the top-left
+ corner of the editable document. If it is <code>"page"</code> or
+ not given, they are relative to the top-left corner of the
+ page. <code>yBot</code> is the coordinate of the bottom of the
+ cursor. <code>start</code> is a boolean indicating whether you
+ want the start or the end of the selection.</dd>
+ <dt id="charCoords"><code>charCoords(pos, mode) → object</code></dt>
+ <dd>Like <code>cursorCoords</code>, but returns the position of
+ an arbitrary characters. <code>pos</code> should be
+ a <code>{line, ch}</code> object.</dd>
+ <dt id="coordsChar"><code>coordsChar(object) → pos</code></dt>
+ <dd>Given an <code>{x, y}</code> object (in page coordinates),
+ returns the <code>{line, ch}</code> position that corresponds to
+ it.</dd>
+
+ <dt id="undo"><code>undo()</code></dt>
+ <dd>Undo one edit (if any undo events are stored).</dd>
+ <dt id="redo"><code>redo()</code></dt>
+ <dd>Redo one undone edit.</dd>
+ <dt id="historySize"><code>historySize() → object</code></dt>
+ <dd>Returns an object with <code>{undo, redo}</code> properties,
+ both of which hold integers, indicating the amount of stored
+ undo and redo operations.</dd>
+ <dt id="clearHistory"><code>clearHistory()</code></dt>
+ <dd>Clears the editor's undo history.</dd>
+
+ <dt id="indentLine"><code>indentLine(line, dir)</code></dt>
+ <dd>Reset the given line's indentation to the indentation
+ prescribed by the mode. If the second argument is given,
+ indentation will be increased (if <code>dir</code> is true) or
+ decreased (if false) by an <a href="#option_indentUnit">indent
+ unit</a> instead.</dd>
+
+ <dt id="getTokenAt"><code>getTokenAt(pos) → object</code></dt>
+ <dd>Retrieves information about the token the current mode found
+ before the given position (a <code>{line, ch}</code> object). The
+ returned object has the following properties:
+ <dl>
+ <dt><code>start</code></dt><dd>The character (on the given line) at which the token starts.</dd>
+ <dt><code>end</code></dt><dd>The character at which the token ends.</dd>
+ <dt><code>string</code></dt><dd>The token's string.</dd>
+ <dt><code>className</code></dt><dd>The class the mode assigned
+ to the token. (Can be null when no class was assigned.)</dd>
+ <dt><code>state</code></dt><dd>The mode's state at the end of this token.</dd>
+ </dl></dd>
+
+ <dt id="markText"><code>markText(from, to, className) → object</code></dt>
+ <dd>Can be used to mark a range of text with a specific CSS
+ class name. <code>from</code> and <code>to</code> should
+ be <code>{line, ch}</code> objects. The method will return an
+ object with two methods, <code>clear()</code>, which removes the
+ mark, and <code>find()</code>, which returns a <code>{from,
+ to}</code> (both document positions), indicating the current
+ position of the marked range.</dd>
+
+ <dt id="setBookmark"><code>setBookmark(pos) → object</code></dt>
+ <dd>Inserts a bookmark, a handle that follows the text around it
+ as it is being edited, at the given position. A bookmark has two
+ methods <code>find()</code> and <code>clear()</code>. The first
+ returns the current position of the bookmark, if it is still in
+ the document, and the second explicitly removes the
+ bookmark.</dd>
+
+ <dt id="findMarksAt"><code>findMarksAt(pos) → array</code></dt>
+ <dd>Returns an array of all the bookmarks and marked ranges
+ present at the given position.</dd>
+
+ <dt id="setMarker"><code>setMarker(line, text, className) → lineHandle</code></dt>
+ <dd>Add a gutter marker for the given line. Gutter markers are
+ shown in the line-number area (instead of the number for this
+ line). Both <code>text</code> and <code>className</code> are
+ optional. Setting <code>text</code> to a Unicode character like
+ ● tends to give a nice effect. To put a picture in the gutter,
+ set <code>text</code> to a space and <code>className</code> to
+ something that sets a background image. If you
+ specify <code>text</code>, the given text (which may contain
+ HTML) will, by default, replace the line number for that line.
+ If this is not what you want, you can include the
+ string <code>%N%</code> in the text, which will be replaced by
+ the line number.</dd>
+ <dt id="clearMarker"><code>clearMarker(line)</code></dt>
+ <dd>Clears a marker created
+ with <code>setMarker</code>. <code>line</code> can be either a
+ number or a handle returned by <code>setMarker</code> (since a
+ number may now refer to a different line if something was added
+ or deleted).</dd>
+ <dt id="setLineClass"><code>setLineClass(line, className, backgroundClassName) → lineHandle</code></dt>
+ <dd>Set a CSS class name for the given line. <code>line</code>
+ can be a number or a line handle (as returned
+ by <code>setMarker</code> or this
+ function). <code>className</code> will be used to style the text
+ for the line, and <code>backgroundClassName</code> to style its
+ background (which lies behind the selection).
+ Pass <code>null</code> to clear the classes for a line.</dd>
+ <dt id="hideLine"><code>hideLine(line) → lineHandle</code></dt>
+ <dd>Hide the given line (either by number or by handle). Hidden
+ lines don't show up in the editor, and their numbers are skipped
+ when <a href="#option_lineNumbers">line numbers</a> are enabled.
+ Deleting a region around them does delete them, and coping a
+ region around will include them in the copied text.</dd>
+ <dt id="showLine"><code>showLine(line) → lineHandle</code></dt>
+ <dd>The inverse of <code>hideLine</code>—re-shows a previously
+ hidden line, by number or by handle.</dd>
+
+ <dt id="onDeleteLine"><code>onDeleteLine(line, func)</code></dt>
+ <dd>Register a function that should be called when the line is
+ deleted from the document.</dd>
+
+ <dt id="lineInfo"><code>lineInfo(line) → object</code></dt>
+ <dd>Returns the line number, text content, and marker status of
+ the given line, which can be either a number or a handle
+ returned by <code>setMarker</code>. The returned object has the
+ structure <code>{line, handle, text, markerText, markerClass,
+ lineClass, bgClass}</code>.</dd>
+
+ <dt id="getLineHandle"><code>getLineHandle(num) → lineHandle</code></dt>
+ <dd>Fetches the line handle for the given line number.</dd>
+
+ <dt id="addWidget"><code>addWidget(pos, node, scrollIntoView)</code></dt>
+ <dd>Puts <code>node</code>, which should be an absolutely
+ positioned DOM node, into the editor, positioned right below the
+ given <code>{line, ch}</code> position.
+ When <code>scrollIntoView</code> is true, the editor will ensure
+ that the entire node is visible (if possible). To remove the
+ widget again, simply use DOM methods (move it somewhere else, or
+ call <code>removeChild</code> on its parent).</dd>
+
+ <dt id="matchBrackets"><code>matchBrackets()</code></dt>
+ <dd>Force matching-bracket-highlighting to happen.</dd>
+
+ <dt id="lineCount"><code>lineCount() → number</code></dt>
+ <dd>Get the number of lines in the editor.</dd>
+
+ <dt id="getCursor"><code>getCursor(start) → object</code></dt>
+ <dd><code>start</code> is a boolean indicating whether the start
+ or the end of the selection must be retrieved. If it is not
+ given, the current cursor pos, i.e. the side of the selection
+ that would move if you pressed an arrow key, is chosen.
+ A <code>{line, ch}</code> object will be returned.</dd>
+ <dt id="somethingSelected"><code>somethingSelected() → boolean</code></dt>
+ <dd>Return true if any text is selected.</dd>
+ <dt id="setCursor"><code>setCursor(pos)</code></dt>
+ <dd>Set the cursor position. You can either pass a
+ single <code>{line, ch}</code> object, or the line and the
+ character as two separate parameters.</dd>
+ <dt id="setSelection"><code>setSelection(start, end)</code></dt>
+ <dd>Set the selection range. <code>start</code>
+ and <code>end</code> should be <code>{line, ch}</code> objects.</dd>
+
+ <dt id="getLine"><code>getLine(n) → string</code></dt>
+ <dd>Get the content of line <code>n</code>.</dd>
+ <dt id="setLine"><code>setLine(n, text)</code></dt>
+ <dd>Set the content of line <code>n</code>.</dd>
+ <dt id="removeLine"><code>removeLine(n)</code></dt>
+ <dd>Remove the given line from the document.</dd>
+
+ <dt id="getRange"><code>getRange(from, to) → string</code></td>
+ <dd>Get the text between the given points in the editor, which
+ should be <code>{line, ch}</code> objects.</dd>
+ <dt id="replaceRange"><code>replaceRange(string, from, to)</code></dt>
+ <dd>Replace the part of the document between <code>from</code>
+ and <code>to</code> with the given string. <code>from</code>
+ and <code>to</code> must be <code>{line, ch}</code>
+ objects. <code>to</code> can be left off to simply insert the
+ string at position <code>from</code>.</dd>
+
+ <dt id="posFromIndex"><code>posFromIndex(index) → object</code></dt>
+ <dd>Calculates and returns a <code>{line, ch}</code> object for a
+ zero-based <code>index</code> who's value is relative to the start of the
+ editor's text. If the <code>index</code> is out of range of the text then
+ the returned object is clipped to start or end of the text
+ respectively.</dd>
+ <dt id="indexFromPos"><code>indexFromPos(object) → number</code></dt>
+ <dd>The reverse of <a href="#posFromIndex"><code>posFromIndex</code></a>.</dd>
+ </dl>
+
+ <p>The following are more low-level methods:</p>
+
+ <dl>
+ <dt id="operation"><code>operation(func) → result</code></dt>
+ <dd>CodeMirror internally buffers changes and only updates its
+ DOM structure after it has finished performing some operation.
+ If you need to perform a lot of operations on a CodeMirror
+ instance, you can call this method with a function argument. It
+ will call the function, buffering up all changes, and only doing
+ the expensive update after the function returns. This can be a
+ lot faster. The return value from this method will be the return
+ value of your function.</dd>
+
+ <dt id="compoundChange"><code>compoundChange(func) → result</code></dt>
+ <dd>Will call the given function (and return its result),
+ combining all changes made while that function executes into a
+ single undo event.</dd>
+
+ <dt id="refresh"><code>refresh()</code></dt>
+ <dd>If your code does something to change the size of the editor
+ element (window resizes are already listened for), or unhides
+ it, you should probably follow up by calling this method to
+ ensure CodeMirror is still looking as intended.</dd>
+
+ <dt id="getInputField"><code>getInputField() → textarea</code></dt>
+ <dd>Returns the hidden textarea used to read input.</dd>
+ <dt id="getWrapperElement"><code>getWrapperElement() → node</code></dt>
+ <dd>Returns the DOM node that represents the editor. Remove this
+ from your tree to delete an editor instance.</dd>
+ <dt id="getScrollerElement"><code>getScrollerElement() → node</code></dt>
+ <dd>Returns the DOM node that is responsible for the sizing and
+ the scrolling of the editor. You can change
+ the <code>height</code> and <code>width</code> styles of this
+ element to resize an editor. (You might have to call
+ the <a href="#refresh"><code>refresh</code></a> method
+ afterwards.)</dd>
+ <dt id="getGutterElement"><code>getGutterElement() → node</code></dt>
+ <dd>Fetches the DOM node that represents the editor gutter.</dd>
+
+ <dt id="getStateAfter"><code>getStateAfter(line) → state</code></dt>
+ <dd>Returns the mode's parser state, if any, at the end of the
+ given line number. If no line number is given, the state at the
+ end of the document is returned. This can be useful for storing
+ parsing errors in the state, or getting other kinds of
+ contextual information for a line.</dd>
+ </dl>
+
+ <p id="fromTextArea">Finally, the <code>CodeMirror</code> object
+ itself has a method <code>fromTextArea</code>. This takes a
+ textarea DOM node as first argument and an optional configuration
+ object as second. It will replace the textarea with a CodeMirror
+ instance, and wire up the form of that textarea (if any) to make
+ sure the editor contents are put into the textarea when the form
+ is submitted. A CodeMirror instance created this way has two
+ additional methods:</p>
+
+ <dl>
+ <dt id="save"><code>save()</code></dt>
+ <dd>Copy the content of the editor into the textarea.</dd>
+
+ <dt id="toTextArea"><code>toTextArea()</code></dt>
+ <dd>Remove the editor, and restore the original textarea (with
+ the editor's current content).</dd>
+
+ <dt id="getTextArea"><code>getTextArea() → textarea</code></dt>
+ <dd>Returns the textarea that the instance was based on.</dd>
+ </dl>
+
+ <p id="defineExtension">If you want to define extra methods in terms
+ of the CodeMirror API, it is possible to
+ use <code>CodeMirror.defineExtension(name, value)</code>. This
+ will cause the given value (usually a method) to be added to all
+ CodeMirror instances created from then on.</p>
+
+ <h2 id="addons">Add-ons</h2>
+
+ <p>The <code>lib/util</code> directory in the distribution
+ contains a number of reusable components that implement extra
+ editor functionality. In brief, they are:</p>
+
+ <dl>
+ <dt id="util_dialog"><a href="../lib/util/dialog.js"><code>dialog.js</code></a></dt>
+ <dd>Provides a very simple way to query users for text input.
+ Adds an <code>openDialog</code> method to CodeMirror instances,
+ which can be called with an HTML fragment that provides the
+ prompt (should include an <code>input</code> tag), and a
+ callback function that is called when text has been entered.
+ Depends on <code>lib/util/dialog.css</code>.</dd>
+ <dt id="util_searchcursor"><a href="../lib/util/searchcursor.js"><code>searchcursor.js</code></a></dt>
+ <dd>Adds the <code>getSearchCursor(query, start, caseFold) →
+ cursor</code> method to CodeMirror instances, which can be used
+ to implement search/replace functionality. <code>query</code>
+ can be a regular expression or a string (only strings will match
+ across lines—if they contain newlines). <code>start</code>
+ provides the starting position of the search. It can be
+ a <code>{line, ch}</code> object, or can be left off to default
+ to the start of the document. <code>caseFold</code> is only
+ relevant when matching a string. It will cause the search to be
+ case-insensitive. A search cursor has the following methods:
+ <dl>
+ <dt><code>findNext(), findPrevious() → boolean</code></dt>
+ <dd>Search forward or backward from the current position.
+ The return value indicates whether a match was found. If
+ matching a regular expression, the return value will be the
+ array returned by the <code>match</code> method, in case you
+ want to extract matched groups.</dd>
+ <dt><code>from(), to() → object</code></dt>
+ <dd>These are only valid when the last call
+ to <code>findNext</code> or <code>findPrevious</code> did
+ not return false. They will return <code>{line, ch}</code>
+ objects pointing at the start and end of the match.</dd>
+ <dt><code>replace(text)</code></dt>
+ <dd>Replaces the currently found match with the given text
+ and adjusts the cursor position to reflect the
+ replacement.</dd>
+ </dl></dd>
+
+ <dt id="util_search"><a href="../lib/util/search.js"><code>search.js</code></a></dt>
+ <dd>Implements the search commands. CodeMirror has keys bound to
+ these by default, but will not do anything with them unless an
+ implementation is provided. Depends
+ on <code>searchcursor.js</code>, and will make use
+ of <a href="#util_dialog"><code>openDialog</code></a> when
+ available to make prompting for search queries less ugly.</dd>
+ <dt id="util_foldcode"><a href="../lib/util/foldcode.js"><code>foldcode.js</code></a></dt>
+ <dd>Helps with code folding.
+ See <a href="../demo/folding.html">the demo</a> for an example.
+ Call <code>CodeMirror.newFoldFunction</code> with a range-finder
+ helper function to create a function that will, when applied to
+ a CodeMirror instance and a line number, attempt to fold or
+ unfold the block starting at the given line. A range-finder is a
+ language-specific function that also takes an instance and a
+ line number, and returns an end line for the block, or null if
+ no block is started on that line. This file
+ provides <code>CodeMirror.braceRangeFinder</code>, which finds
+ blocks in brace languages (JavaScript, C, Java,
+ etc), <code>CodeMirror.indentRangeFinder</code>, for languages
+ where indentation determines block structure (Python, Haskell),
+ and <code>CodeMirror.tagRangeFinder</code>, for XML-style
+ languages.</dd>
+ <dt id="util_runmode"><a href="../lib/util/runmode.js"><code>runmode.js</code></a></dt>
+ <dd>Can be used to run a CodeMirror mode over text without
+ actually opening an editor instance.
+ See <a href="../demo/runmode.html">the demo</a> for an
+ example.</dd>
+ <dt id="util_overlay"><a href="../lib/util/overlay.js"><code>overlay.js</code></a></dt>
+ <dd>Mode combinator that can be used to extend a mode with an
+ 'overlay' — a secondary mode is run over the stream, along with
+ the base mode, and can color specific pieces of text without
+ interfering with the base mode.
+ Defines <code>CodeMirror.overlayMode</code>, which is used to
+ create such a mode. See <a href="../demo/mustache.html">this
+ demo</a> for a detailed example.</dd>
+ <dt id="util_multiplex"><a href="../lib/util/multiplex.js"><code>multiplex.js</code></a></dt>
+ <dd>Mode combinator that can be used to easily 'multiplex'
+ between several modes.
+ Defines <code>CodeMirror.multiplexingMode</code> which, when
+ given as first argument a mode object, and as other arguments
+ any number of <code>{open, close, mode [, delimStyle]}</code>
+ objects, will return a mode object that starts parsing using the
+ mode passed as first argument, but will switch to another mode
+ as soon as it encounters a string that occurs in one of
+ the <code>open</code> fields of the passed objects. When in a
+ sub-mode, it will go back to the top mode again when
+ the <code>close</code> string is encountered.
+ When <code>delimStyle</code> is specified, it will be the token
+ style returned for the delimiter tokens. The outer mode will not
+ see the content between the delimiters.
+ See <a href="../demo/multiplex.html">this demo</a> for an
+ example.</dd>
+ <dt id="util_simple-hint"><a href="../lib/util/simple-hint.js"><code>simple-hint.js</code></a></dt>
+ <dd>Provides a framework for showing autocompletion hints.
+ Defines <code>CodeMirror.simpleHint</code>, which takes a
+ CodeMirror instance and a hinting function, and pops up a widget
+ that allows the user to select a completion. Hinting functions
+ are function that take an editor instance, and return
+ a <code>{list, from, to}</code> object, where <code>list</code>
+ is an array of strings (the completions), and <code>from</code>
+ and <code>to</code> give the start and end of the token that is
+ being completed. Depends
+ on <code>lib/util/simple-hint.css</code>.</dd>
+ <dt id="util_javascript-hint"><a href="../lib/util/javascript-hint.js"><code>javascript-hint.js</code></a></dt>
+ <dd>Defines <code>CodeMirror.javascriptHint</code>
+ and <code>CodeMirror.coffeescriptHint</code>, which are simple
+ hinting functions for the JavaScript and CoffeeScript
+ modes.</dd>
+ <dt id="util_match-highlighter"><a href="../lib/util/match-highlighter.js"><code>match-highlighter.js</code></a></dt>
+ <dd>Adds a <code>matchHighlight</code> method to CodeMirror
+ instances that can be called (typically from
+ a <a href="#option_onCursorActivity"><code>onCursorActivity</code></a>
+ handler) to highlight all instances of a currently selected word
+ with the a classname given as a first argument to the method.
+ Depends on
+ the <a href="#util_searchcursor"><code>searchcursor</code></a>
+ add-on. Demo <a href="../demo/matchhighlighter.html">here</a>.</dd>
+ <dt id="util_closetag"><a href="../lib/util/closetag.js"><code>closetag.js</code></a></dt>
+ <dd>Provides utility functions for adding automatic tag closing
+ to XML modes. See
+ the <a href="../demo/closetag.html">demo</a>.</dd>
+ <dt id="util_loadmode"><a href="../lib/util/loadmode.js"><code>loadmode.js</code></a></dt>
+ <dd>Defines a <code>CodeMirror.requireMode(modename,
+ callback)</code> function that will try to load a given mode and
+ call the callback when it succeeded. You'll have to
+ set <code>CodeMirror.modeURL</code> to a string that mode paths
+ can be constructed from, for
+ example <code>"mode/%N/%N.js"</code>—the <code>%N</code>'s will
+ be replaced with the mode name. Also
+ defines <code>CodeMirror.autoLoadMode(instance, mode)</code>,
+ which will ensure the given mode is loaded and cause the given
+ editor instance to refresh its mode when the loading
+ succeeded. See the <a href="../demo/loadmode.html">demo</a>.</dd>
+ </dl>
+
+ <h2 id="modeapi">Writing CodeMirror Modes</h2>
+
+ <p>Modes typically consist of a single JavaScript file. This file
+ defines, in the simplest case, a lexer (tokenizer) for your
+ language—a function that takes a character stream as input,
+ advances it past a token, and returns a style for that token. More
+ advanced modes can also handle indentation for the language.</p>
+
+ <p id="defineMode">The mode script should
+ call <code>CodeMirror.defineMode</code> to register itself with
+ CodeMirror. This function takes two arguments. The first should be
+ the name of the mode, for which you should use a lowercase string,
+ preferably one that is also the name of the files that define the
+ mode (i.e. <code>"xml"</code> is defined <code>xml.js</code>). The
+ second argument should be a function that, given a CodeMirror
+ configuration object (the thing passed to
+ the <code>CodeMirror</code> function) and an optional mode
+ configuration object (as in
+ the <a href="#option_mode"><code>mode</code></a> option), returns
+ a mode object.</p>
+
+ <p>Typically, you should use this second argument
+ to <code>defineMode</code> as your module scope function (modes
+ should not leak anything into the global scope!), i.e. write your
+ whole mode inside this function.</p>
+
+ <p>The main responsibility of a mode script is <em>parsing</em>
+ the content of the editor. Depending on the language and the
+ amount of functionality desired, this can be done in really easy
+ or extremely complicated ways. Some parsers can be stateless,
+ meaning that they look at one element (<em>token</em>) of the code
+ at a time, with no memory of what came before. Most, however, will
+ need to remember something. This is done by using a <em>state
+ object</em>, which is an object that is always passed when
+ reading a token, and which can be mutated by the tokenizer.</p>
+
+ <p id="startState">Modes that use a state must define
+ a <code>startState</code> method on their mode object. This is a
+ function of no arguments that produces a state object to be used
+ at the start of a document.</p>
+
+ <p id="token">The most important part of a mode object is
+ its <code>token(stream, state)</code> method. All modes must
+ define this method. It should read one token from the stream it is
+ given as an argument, optionally update its state, and return a
+ style string, or <code>null</code> for tokens that do not have to
+ be styled. For your styles, you can either use the 'standard' ones
+ defined in the themes (without the <code>cm-</code> prefix), or
+ define your own and have people include a custom CSS file for your
+ mode.<p>
+
+ <p id="StringStream">The stream object encapsulates a line of code
+ (tokens may never span lines) and our current position in that
+ line. It has the following API:</p>
+
+ <dl>
+ <dt><code>eol() → boolean</code></dt>
+ <dd>Returns true only if the stream is at the end of the
+ line.</dd>
+ <dt><code>sol() → boolean</code></dt>
+ <dd>Returns true only if the stream is at the start of the
+ line.</dd>
+
+ <dt><code>peek() → character</code></dt>
+ <dd>Returns the next character in the stream without advancing
+ it. Will return <code>undefined</code> at the end of the
+ line.</dd>
+ <dt><code>next() → character</code></dt>
+ <dd>Returns the next character in the stream and advances it.
+ Also returns <code>undefined</code> when no more characters are
+ available.</dd>
+
+ <dt><code>eat(match) → character</code></dt>
+ <dd><code>match</code> can be a character, a regular expression,
+ or a function that takes a character and returns a boolean. If
+ the next character in the stream 'matches' the given argument,
+ it is consumed and returned. Otherwise, <code>undefined</code>
+ is returned.</dd>
+ <dt><code>eatWhile(match) → boolean</code></dt>
+ <dd>Repeatedly calls <code>eat</code> with the given argument,
+ until it fails. Returns true if any characters were eaten.</dd>
+ <dt><code>eatSpace() → boolean</code></dt>
+ <dd>Shortcut for <code>eatWhile</code> when matching
+ white-space.</dd>
+ <dt><code>skipToEnd()</code></dt>
+ <dd>Moves the position to the end of the line.</dd>
+ <dt><code>skipTo(ch) → boolean</code></dt>
+ <dd>Skips to the next occurrence of the given character, if
+ found on the current line (doesn't advance the stream if the
+ character does not occur on the line). Returns true if the
+ character was found.</dd>
+ <dt><code>match(pattern, consume, caseFold) → boolean</code></dt>
+ <dd>Act like a
+ multi-character <code>eat</code>—if <code>consume</code> is true
+ or not given—or a look-ahead that doesn't update the stream
+ position—if it is false. <code>pattern</code> can be either a
+ string or a regular expression starting with <code>^</code>.
+ When it is a string, <code>caseFold</code> can be set to true to
+ make the match case-insensitive. When successfully matching a
+ regular expression, the returned value will be the array
+ returned by <code>match</code>, in case you need to extract
+ matched groups.</dd>
+
+ <dt><code>backUp(n)</code></dt>
+ <dd>Backs up the stream <code>n</code> characters. Backing it up
+ further than the start of the current token will cause things to
+ break, so be careful.</dd>
+ <dt><code>column() → integer</code></dt>
+ <dd>Returns the column (taking into account tabs) at which the
+ current token starts. Can be used to find out whether a token
+ starts a new line.</dd>
+ <dt><code>indentation() → integer</code></dt>
+ <dd>Tells you how far the current line has been indented, in
+ spaces. Corrects for tab characters.</dd>
+
+ <dt><code>current() → string</code></dt>
+ <dd>Get the string between the start of the current token and
+ the current stream position.</dd>
+ </dl>
+
+ <p id="blankLine">By default, blank lines are simply skipped when
+ tokenizing a document. For languages that have significant blank
+ lines, you can define a <code>blankLine(state)</code> method on
+ your mode that will get called whenever a blank line is passed
+ over, so that it can update the parser state.</p>
+
+ <p id="copyState">Because state object are mutated, and CodeMirror
+ needs to keep valid versions of a state around so that it can
+ restart a parse at any line, copies must be made of state objects.
+ The default algorithm used is that a new state object is created,
+ which gets all the properties of the old object. Any properties
+ which hold arrays get a copy of these arrays (since arrays tend to
+ be used as mutable stacks). When this is not correct, for example
+ because a mode mutates non-array properties of its state object, a
+ mode object should define a <code>copyState</code> method,
+ which is given a state and should return a safe copy of that
+ state.</p>
+
+ <p id="compareStates">By default, CodeMirror will stop re-parsing
+ a document as soon as it encounters a few lines that were
+ highlighted the same in the old parse as in the new one. It is
+ possible to provide an explicit way to test whether a state is
+ equivalent to another one, which CodeMirror will use (instead of
+ the unchanged-lines heuristic) to decide when to stop
+ highlighting. You do this by providing
+ a <code>compareStates</code> method on your mode object, which
+ takes two state arguments and returns a boolean indicating whether
+ they are equivalent. See the XML mode, which uses this to provide
+ reliable highlighting of bad closing tags, as an example.</p>
+
+ <p id="indent">If you want your mode to provide smart indentation
+ (though the <a href="#indentLine"><code>indentLine</code></a>
+ method and the <code>indentAuto</code>
+ and <code>newlineAndIndent</code> commands, which keys can be
+ <a href="#option_extraKeys">bound</a> to), you must define
+ an <code>indent(state, textAfter)</code> method on your mode
+ object.</p>
+
+ <p>The indentation method should inspect the given state object,
+ and optionally the <code>textAfter</code> string, which contains
+ the text on the line that is being indented, and return an
+ integer, the amount of spaces to indent. It should usually take
+ the <a href="#option_indentUnit"><code>indentUnit</code></a>
+ option into account.</p>
+
+ <p id="electricChars">Finally, a mode may define
+ an <code>electricChars</code> property, which should hold a string
+ containing all the characters that should trigger the behaviour
+ described for
+ the <a href="#option_electricChars"><code>electricChars</code></a>
+ option.</p>
+
+ <p>So, to summarize, a mode <em>must</em> provide
+ a <code>token</code> method, and it <em>may</em>
+ provide <code>startState</code>, <code>copyState</code>,
+ <code>compareStates</code>, and <code>indent</code> methods. For
+ an example of a trivial mode, see
+ the <a href="../mode/diff/diff.js">diff mode</a>, for a more involved
+ example, see the <a href="../mode/clike/clike.js">C-like
+ mode</a>.</p>
+
+ <p>Sometimes, it is useful for modes to <em>nest</em>—to have one
+ mode delegate work to another mode. An example of this kind of
+ mode is the <a href="../mode/htmlmixed/htmlmixed.js">mixed-mode HTML
+ mode</a>. To implement such nesting, it is usually necessary to
+ create mode objects and copy states yourself. To create a mode
+ object, there are <code>CodeMirror.getMode(options,
+ parserConfig)</code>, where the first argument is a configuration
+ object as passed to the mode constructor function, and the second
+ argument is a mode specification as in
+ the <a href="#option_mode"><code>mode</code></a> option. To copy a
+ state object, call <code>CodeMirror.copyState(mode, state)</code>,
+ where <code>mode</code> is the mode that created the given
+ state.</p>
+
+ <p>To make indentation work properly in a nested parser, it is
+ advisable to give the <code>startState</code> method of modes that
+ are intended to be nested an optional argument that provides the
+ base indentation for the block of code. The JavaScript and CSS
+ parser do this, for example, to allow JavaScript and CSS code
+ inside the mixed-mode HTML mode to be properly indented.</p>
+
+ <p>Finally, it is possible to associate your mode, or a certain
+ configuration of your mode, with
+ a <a href="http://en.wikipedia.org/wiki/MIME">MIME</a> type. For
+ example, the JavaScript mode associates itself
+ with <code>text/javascript</code>, and its JSON variant
+ with <code>application/json</code>. To do this,
+ call <code>CodeMirror.defineMIME(mime, modeSpec)</code>,
+ where <code>modeSpec</code> can be a string or object specifying a
+ mode, as in the <a href="#option_mode"><code>mode</code></a>
+ option.</p>
+
+</div><div class="rightsmall blk">
+
+ <h2>Contents</h2>
+
+ <ul>
+ <li><a href="#overview">Overview</a></li>
+ <li><a href="#usage">Basic Usage</a></li>
+ <li><a href="#config">Configuration</a></li>
+ <li><a href="#keymaps">Keymaps</a></li>
+ <li><a href="#styling">Customized Styling</a></li>
+ <li><a href="#api">Programming API</a></li>
+ <li><a href="#addons">Add-ons</a></li>
+ <li><a href="#modeapi">Writing CodeMirror Modes</a></li>
+ </ul>
+
+</div></div>
+
+<div style="height: 2em">&nbsp;</div>
+
+ </body>
+</html>