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Multi-error, multi-language, and cross-platform spell-check

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Scott Nonnenberg 2017-08-16 18:09:50 -07:00
parent 122719688a
commit e8c7e31363
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GPG key ID: A4931C09644C654B
3 changed files with 138 additions and 61 deletions
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134
js/spell_check.js Normal file
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@ -0,0 +1,134 @@
(function () {
var electron = require('electron');
var remote = electron.remote;
var app = remote.app;
var webFrame = electron.webFrame;
var path = require('path');
var osLocale = require('os-locale');
var os = require('os');
var semver = require('semver');
var spellchecker = require('spellchecker');
// `remote.require` since `Menu` is a main-process module.
var buildEditorContextMenu = remote.require('electron-editor-context-menu');
var EN_VARIANT = /^en/;
// Prevent the spellchecker from showing contractions as errors.
var ENGLISH_SKIP_WORDS = [
'ain',
'couldn',
'didn',
'doesn',
'hadn',
'hasn',
'mightn',
'mustn',
'needn',
'oughtn',
'shan',
'shouldn',
'wasn',
'weren',
'wouldn'
];
function setupLinux(locale) {
if (process.env.HUNSPELL_DICTIONARIES || locale !== 'en_US') {
// apt-get install hunspell-<locale> can be run for easy access to other dictionaries
var location = process.env.HUNSPELL_DICTIONARIES || '/usr/share/hunspell';
console.log('Detected Linux. Setting up spell check with locale', locale, 'and dictionary location', location);
spellchecker.setDictionary(locale, location);
} else {
console.log('Detected Linux. Using default en_US spell check dictionary');
}
}
function setupWin7AndEarlier(locale) {
if (process.env.HUNSPELL_DICTIONARIES || locale !== 'en_US') {
var location = process.env.HUNSPELL_DICTIONARIES;
console.log('Detected Windows 7 or below. Setting up spell-check with locale', locale, 'and dictionary location', location);
spellchecker.setDictionary(locale, location);
} else {
console.log('Detected Windows 7 or below. Using default en_US spell check dictionary');
}
}
var locale = osLocale.sync().replace('-', '_');
// The LANG environment variable is how node spellchecker finds its default language:
// https://github.com/atom/node-spellchecker/blob/59d2d5eee5785c4b34e9669cd5d987181d17c098/lib/spellchecker.js#L29
if (!process.env.LANG) {
process.env.LANG = locale;
}
if (process.platform === 'linux') {
setupLinux(locale);
} else if (process.platform === 'windows' && semver.lt(os.release(), '8.0.0')) {
setupWin7AndEarlier(locale);
} else {
// OSX and Windows 8+ have OS-level spellcheck APIs
console.log('Using OS-level spell check API with locale', process.env.LANG);
}
var simpleChecker = window.spellChecker = {
spellCheck: function(text) {
return !this.isMisspelled(text);
},
isMisspelled: function(text) {
var misspelled = spellchecker.isMisspelled(text);
// The idea is to make this as fast as possible. For the many, many calls which
// don't result in the red squiggly, we minimize the number of checks.
if (!misspelled) {
return false;
}
// Only if we think we've found an error do we check the locale and skip list.
if (locale.match(EN_VARIANT) && _.contains(ENGLISH_SKIP_WORDS, text)) {
return false;
}
return true;
},
getSuggestions: function(text) {
return spellchecker.getCorrectionsForMisspelling(text);
},
add: function(text) {
spellchecker.add(text);
}
};
webFrame.setSpellCheckProvider(
'en-US',
// Not sure what this parameter (`autoCorrectWord`) does: https://github.com/atom/electron/issues/4371
// The documentation for `webFrame.setSpellCheckProvider` passes `true` so we do too.
true,
simpleChecker
);
window.addEventListener('contextmenu', function(e) {
// Only show the context menu in text editors.
if (!e.target.closest('textarea, input, [contenteditable="true"]')) {
return;
}
var selectedText = window.getSelection().toString();
var isMisspelled = selectedText && simpleChecker.isMisspelled(selectedText);
var spellingSuggestions = isMisspelled && simpleChecker.getSuggestions(selectedText).slice(0, 5);
var menu = buildEditorContextMenu({
isMisspelled: isMisspelled,
spellingSuggestions: spellingSuggestions,
});
// The 'contextmenu' event is emitted after 'selectionchange' has fired but possibly before the
// visible selection has changed. Try to wait to show the menu until after that, otherwise the
// visible selection will update after the menu dismisses and look weird.
setTimeout(function() {
menu.popup(remote.getCurrentWindow());
}, 30);
});
})();

1
package.json
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@ -116,6 +116,7 @@
"images/**",
"fonts/*",
"node_modules/**",
"!node_modules/spellchecker/vendor/hunspell/**/*",
"!**/node_modules/*/{CHANGELOG.md,README.md,README,readme.md,readme,test,__tests__,tests,powered-test,example,examples,*.d.ts}",
"!**/node_modules/.bin",
"!**/node_modules/*/build/**",

64
preload.js
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@ -2,7 +2,7 @@
'use strict';
console.log('preload');
const electron = require('electron')
const electron = require('electron');
window.PROTO_ROOT = 'protos';
window.config = require('url').parse(window.location.toString(), true).query;
@ -28,68 +28,10 @@
ipc.on('debug-log', function() {
Whisper.events.trigger('showDebugLog');
});
/**
* Enables spell-checking and the right-click context menu in text editors.
* Electron (`webFrame.setSpellCheckProvider`) only underlines misspelled words;
* we must manage the menu ourselves.
*
* Run this in the renderer process.
*/
var remote = electron.remote;
var webFrame = electron.webFrame;
var SpellCheckProvider = require('electron-spell-check-provider');
// `remote.require` since `Menu` is a main-process module.
var buildEditorContextMenu = remote.require('electron-editor-context-menu');
var selection;
function resetSelection() {
selection = {
isMisspelled: false,
spellingSuggestions: []
};
}
resetSelection();
// We pull these dependencies in now, from here, because they have Node.js dependencies
window.spellChecker = new SpellCheckProvider(window.config.locale).on('misspelling', function(suggestions) {
// Prime the context menu with spelling suggestions _if_ the user has selected text. Electron
// may sometimes re-run the spell-check provider for an outdated selection e.g. if the user
// right-clicks some misspelled text and then an image.
if (window.getSelection().toString()) {
selection.isMisspelled = true;
// Take the first three suggestions if any.
selection.spellingSuggestions = suggestions.slice(0, 3);
}
});
// Reset the selection when clicking around, before the spell-checker runs and the context menu shows.
window.addEventListener('mousedown', resetSelection);
// The spell-checker runs when the user clicks on text and before the 'contextmenu' event fires.
// Thus, we may retrieve spell-checking suggestions to put in the menu just before it shows.
webFrame.setSpellCheckProvider(
'en-US',
// Not sure what this parameter (`autoCorrectWord`) does: https://github.com/atom/electron/issues/4371
// The documentation for `webFrame.setSpellCheckProvider` passes `true` so we do too.
true,
spellChecker
);
window.addEventListener('contextmenu', function(e) {
// Only show the context menu in text editors.
if (!e.target.closest('textarea, input, [contenteditable="true"]')) return;
var menu = buildEditorContextMenu(selection);
// The 'contextmenu' event is emitted after 'selectionchange' has fired but possibly before the
// visible selection has changed. Try to wait to show the menu until after that, otherwise the
// visible selection will update after the menu dismisses and look weird.
setTimeout(function() {
menu.popup(remote.getCurrentWindow());
}, 30);
});
// we have to pull this in this way because it references node APIs
require('./js/spell_check');
require('./js/backup');
})();