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handler.js
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handler.js
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/*jslint vars: true, plusplus: true, devel: true, nomen: true, indent: 4, maxerr: 50 */
/*global define, brackets */
define(function (require, exports, module) {
"use strict";
var EditorManager = brackets.getModule("editor/EditorManager");
var Lines = require("lines"),
Paragraphs = require("paragraphs"),
Selections = require("selections"),
Dialogs = require("dialogs");
/**
* Regular expressions do most of the heavy lifting, here
* and everywhere.
*
* Note that the heading items allow for the possibility
* that the heading is preceded by a bullet. This seems
* odd but it also works, at least in Markdown Preview,
* and it is a plausible edge case.
*
* Numbering in front of a heading just displays a bullet,
* so it didn't seem worth preserving.
*
* Also note that there is a limit on white space before
* a heading, as four lines equals raw monospace text.
* But there isn't a similar limitation on bullets, because
* it would interfere with bullets at level 3+.
*/
var MATCH_H1 = /^(\s{0,3}|\s*\*\s*)(#\s)/;
var MATCH_H2 = /^(\s{0,3}|\s*\*\s*)(##\s)/;
var MATCH_H3 = /^(\s{0,3}|\s*\*\s*)(###\s)/;
var MATCH_H4 = /^(\s{0,3}|\s*\*\s*)(####\s)/;
var MATCH_H5 = /^(\s{0,3}|\s*\*\s*)(#####\s)/;
var MATCH_H6 = /^(\s{0,3}|\s*\*\s*)(######\s)/;
var MATCH_HD = /^(\s{0,3}|\s*\*\s*)(#+\s)/;
var MATCH_BULLET = /^\s*\*\s/;
var MATCH_NUMBERED = /^\s*\d\.\s/;
var MATCH_QUOTE = /^\s*>\s/;
var MATCH_LIST = /^\s*(\*|>|\d\.)\s/;
/**
* Check initial conditions for any buttons. Make sure
* we have an editor, are in a Markdown document, and
* have a cursor.
*/
function check(editor) {
if (!editor) {
return false;
}
var mode = editor._getModeFromDocument();
if (mode !== "gfm" && mode !== "markdown") {
return false;
}
var cursor = editor.getCursorPos(false, "to");
if (!cursor.line) {
return false;
}
return true;
}
/**
* Generic function to handle line-based tasks (headings and
* lists). For simple cases, this is a toggle. However, if
* multiple lines are selected, and the toggle is on for only
* some lines, it is turned on for all lines where it is off.
*
* This seems like the most intuitive behavior as it allows
* things like selecting across a bunch of lines, some already
* bulleted, and making them all bulleted. Even in that case,
* one extra click will then remove all the bullets.
*/
function handleLineButton(regexp, replace, after, insert) {
var editor = EditorManager.getActiveEditor();
if (!check(editor)) {
return;
}
if (!Lines.allLinesOn(editor, regexp)) {
Lines.turnLinesOn(editor, regexp, replace, after, insert);
} else {
Lines.turnLinesOff(editor, regexp, after);
}
}
/**
* Generic function to handle selection-based tasks (bold,
* italic, strikethrough). Behaves similarly to line behavior
* above.
*/
function handleSelectionButton(match, badMatch) {
var editor = EditorManager.getActiveEditor();
if (!check(editor)) {
return;
}
if (!Selections.allSelectionsOn(editor, match, badMatch)) {
Selections.turnSelectionsOn(editor, match, badMatch);
} else {
Selections.turnSelectionsOff(editor, match, badMatch);
}
}
// Define the exports; these are the functions that get wired
// into toolbar buttons when the toolbar is created.
exports.h1 = function () {
handleLineButton(MATCH_H1, MATCH_HD, MATCH_BULLET, "# ");
};
exports.h2 = function () {
handleLineButton(MATCH_H2, MATCH_HD, MATCH_BULLET, "## ");
};
exports.h3 = function () {
handleLineButton(MATCH_H3, MATCH_HD, MATCH_BULLET, "### ");
};
exports.h4 = function () {
handleLineButton(MATCH_H4, MATCH_HD, MATCH_BULLET, "#### ");
};
exports.h5 = function () {
handleLineButton(MATCH_H5, MATCH_HD, MATCH_BULLET, "##### ");
};
exports.h6 = function () {
handleLineButton(MATCH_H6, MATCH_HD, MATCH_BULLET, "###### ");
};
exports.bold = function () {
handleSelectionButton("**", "");
};
exports.italic = function () {
handleSelectionButton("*", "**");
};
exports.strikethrough = function () {
handleSelectionButton("~~", "");
};
exports.code = function () {
handleSelectionButton("`", "");
};
exports.image = function () {
var editor = EditorManager.getActiveEditor();
if (!check(editor)) {
return;
}
Dialogs.image(editor);
};
exports.link = function () {
var editor = EditorManager.getActiveEditor();
if (!check(editor)) {
return;
}
Dialogs.link(editor);
};
exports.bullet = function () {
handleLineButton(MATCH_BULLET, MATCH_LIST, null, "* ");
};
exports.numbered = function () {
handleLineButton(MATCH_NUMBERED, MATCH_LIST, null, "1. ");
};
exports.quote = function () {
handleLineButton(MATCH_QUOTE, MATCH_LIST, null, "> ");
};
exports.codeblock = function () {
var editor = EditorManager.getActiveEditor();
if (!check(editor)) {
return;
}
Paragraphs.codeblock(editor);
};
exports.paragraph = function () {
var editor = EditorManager.getActiveEditor();
if (!check(editor)) {
return;
}
Paragraphs.paragraph(editor);
};
exports.reflow = function () {
var editor = EditorManager.getActiveEditor();
if (!check(editor)) {
return;
}
Paragraphs.reflow(editor);
};
});