<!DOCTYPE HTML>
< html lang = "en" class = "sidebar-visible no-js colibri" >
< head >
<!-- Book generated using mdBook -->
< meta charset = "UTF-8" >
< title > Adding injection queries< / title >
<!-- Custom HTML head -->
< meta name = "description" content = "" >
< meta name = "viewport" content = "width=device-width, initial-scale=1" >
< meta name = "theme-color" content = "#ffffff" / >
< link rel = "icon" href = "../favicon.svg" >
< link rel = "shortcut icon" href = "../favicon.png" >
< link rel = "stylesheet" href = "../css/variables.css" >
< link rel = "stylesheet" href = "../css/general.css" >
< link rel = "stylesheet" href = "../css/chrome.css" >
< link rel = "stylesheet" href = "../css/print.css" media = "print" >
<!-- Fonts -->
< link rel = "stylesheet" href = "../FontAwesome/css/font-awesome.css" >
< link rel = "preconnect" href = "https://fonts.gstatic.com" >
< link href = "https://fonts.googleapis.com/css2?family=Inter:wght@200;400;500;700&display=swap" rel = "stylesheet" >
< link rel = "stylesheet" href = "../fonts/fonts.css" >
<!-- Highlight.js Stylesheets -->
< link rel = "stylesheet" href = "../highlight.css" >
< link rel = "stylesheet" href = "../tomorrow-night.css" >
< link rel = "stylesheet" href = "../ayu-highlight.css" >
<!-- Custom theme stylesheets -->
< link rel = "stylesheet" href = "../custom.css" >
< / head >
< body >
< div id = "body-container" >
<!-- Provide site root to javascript -->
< script >
var path_to_root = "../";
var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "colibri" : "colibri";
< / script >
<!-- Work around some values being stored in localStorage wrapped in quotes -->
< script >
try {
var theme = localStorage.getItem('mdbook-theme');
var sidebar = localStorage.getItem('mdbook-sidebar');
if (theme.startsWith('"') & & theme.endsWith('"')) {
localStorage.setItem('mdbook-theme', theme.slice(1, theme.length - 1));
}
if (sidebar.startsWith('"') & & sidebar.endsWith('"')) {
localStorage.setItem('mdbook-sidebar', sidebar.slice(1, sidebar.length - 1));
}
} catch (e) { }
< / script >
<!-- Set the theme before any content is loaded, prevents flash -->
< script >
var theme;
try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
if (theme === null || theme === undefined) { theme = default_theme; }
var html = document.querySelector('html');
html.classList.remove('no-js')
html.classList.remove('colibri')
html.classList.add(theme);
html.classList.add('js');
< / script >
<!-- Hide / unhide sidebar before it is displayed -->
< script >
var html = document.querySelector('html');
var sidebar = null;
if (document.body.clientWidth >= 1080) {
try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { }
sidebar = sidebar || 'visible';
} else {
sidebar = 'hidden';
}
html.classList.remove('sidebar-visible');
html.classList.add("sidebar-" + sidebar);
< / script >
< nav id = "sidebar" class = "sidebar" aria-label = "Table of contents" >
< div class = "sidebar-scrollbox" >
< ol class = "chapter" > < li class = "chapter-item expanded affix " > < a href = "../title-page.html" > Helix< / a > < / li > < li class = "chapter-item expanded " > < a href = "../install.html" > < strong aria-hidden = "true" > 1.< / strong > Installation< / a > < / li > < li class = "chapter-item expanded " > < a href = "../usage.html" > < strong aria-hidden = "true" > 2.< / strong > Usage< / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "../keymap.html" > < strong aria-hidden = "true" > 2.1.< / strong > Keymap< / a > < / li > < li class = "chapter-item expanded " > < a href = "../commands.html" > < strong aria-hidden = "true" > 2.2.< / strong > Commands< / a > < / li > < li class = "chapter-item expanded " > < a href = "../lang-support.html" > < strong aria-hidden = "true" > 2.3.< / strong > Language support< / a > < / li > < / ol > < / li > < li class = "chapter-item expanded " > < a href = "../from-vim.html" > < strong aria-hidden = "true" > 3.< / strong > Migrating from Vim< / a > < / li > < li class = "chapter-item expanded " > < a href = "../configuration.html" > < strong aria-hidden = "true" > 4.< / strong > Configuration< / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "../themes.html" > < strong aria-hidden = "true" > 4.1.< / strong > Themes< / a > < / li > < li class = "chapter-item expanded " > < a href = "../remapping.html" > < strong aria-hidden = "true" > 4.2.< / strong > Key remapping< / a > < / li > < li class = "chapter-item expanded " > < a href = "../languages.html" > < strong aria-hidden = "true" > 4.3.< / strong > Languages< / a > < / li > < / ol > < / li > < li class = "chapter-item expanded " > < a href = "../guides/index.html" > < strong aria-hidden = "true" > 5.< / strong > Guides< / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "../guides/adding_languages.html" > < strong aria-hidden = "true" > 5.1.< / strong > Adding languages< / a > < / li > < li class = "chapter-item expanded " > < a href = "../guides/textobject.html" > < strong aria-hidden = "true" > 5.2.< / strong > Adding textobject queries< / a > < / li > < li class = "chapter-item expanded " > < a href = "../guides/indent.html" > < strong aria-hidden = "true" > 5.3.< / strong > Adding indent queries< / a > < / li > < li class = "chapter-item expanded " > < a href = "../guides/injection.html" class = "active" > < strong aria-hidden = "true" > 5.4.< / strong > Adding injection queries< / a > < / li > < / ol > < / li > < / ol >
< / div >
< div id = "sidebar-resize-handle" class = "sidebar-resize-handle" > < / div >
< / nav >
<!-- Track and set sidebar scroll position -->
< script >
var sidebarScrollbox = document.querySelector('#sidebar .sidebar-scrollbox');
sidebarScrollbox.addEventListener('click', function(e) {
if (e.target.tagName === 'A') {
sessionStorage.setItem('sidebar-scroll', sidebarScrollbox.scrollTop);
}
}, { passive: true });
var sidebarScrollTop = sessionStorage.getItem('sidebar-scroll');
sessionStorage.removeItem('sidebar-scroll');
if (sidebarScrollTop) {
// preserve sidebar scroll position when navigating via links within sidebar
sidebarScrollbox.scrollTop = sidebarScrollTop;
} else {
// scroll sidebar to current active section when navigating via "next/previous chapter" buttons
var activeSection = document.querySelector('#sidebar .active');
if (activeSection) {
activeSection.scrollIntoView({ block: 'center' });
}
}
< / script >
< div id = "page-wrapper" class = "page-wrapper" >
< div class = "page" >
< div id = "menu-bar-hover-placeholder" > < / div >
< div id = "menu-bar" class = "menu-bar sticky" >
< div class = "left-buttons" >
< button id = "sidebar-toggle" class = "icon-button" type = "button" title = "Toggle Table of Contents" aria-label = "Toggle Table of Contents" aria-controls = "sidebar" >
< i class = "fa fa-bars" > < / i >
< / button >
< button id = "theme-toggle" class = "icon-button" type = "button" title = "Change theme" aria-label = "Change theme" aria-haspopup = "true" aria-expanded = "false" aria-controls = "theme-list" >
< i class = "fa fa-paint-brush" > < / i >
< / button >
< ul id = "theme-list" class = "theme-popup" aria-label = "Themes" role = "menu" >
< li role = "none" > < button role = "menuitem" class = "theme" id = "light" > Light< / button > < / li >
< li role = "none" > < button role = "menuitem" class = "theme" id = "rust" > Rust< / button > < / li >
< li role = "none" > < button role = "menuitem" class = "theme" id = "coal" > Coal< / button > < / li >
< li role = "none" > < button role = "menuitem" class = "theme" id = "navy" > Navy< / button > < / li >
< li role = "none" > < button role = "menuitem" class = "theme" id = "ayu" > Ayu< / button > < / li >
< li role = "none" > < button role = "menuitem" class = "theme" id = "colibri" > Colibri< / button > < / li >
< / ul >
< button id = "search-toggle" class = "icon-button" type = "button" title = "Search. (Shortkey: s)" aria-label = "Toggle Searchbar" aria-expanded = "false" aria-keyshortcuts = "S" aria-controls = "searchbar" >
< i class = "fa fa-search" > < / i >
< / button >
< / div >
< h1 class = "menu-title" > < / h1 >
< div class = "right-buttons" >
< a href = "../print.html" title = "Print this book" aria-label = "Print this book" >
< i id = "print-button" class = "fa fa-print" > < / i >
< / a >
< a href = "https://github.com/helix-editor/helix" title = "Git repository" aria-label = "Git repository" >
< i id = "git-repository-button" class = "fa fa-github" > < / i >
< / a >
< a href = "https://github.com/helix-editor/helix/edit/master/book/src/guides/injection.md" title = "Suggest an edit" aria-label = "Suggest an edit" >
< i id = "git-edit-button" class = "fa fa-edit" > < / i >
< / a >
< / div >
< / div >
< div id = "search-wrapper" class = "hidden" >
< form id = "searchbar-outer" class = "searchbar-outer" >
< input type = "search" id = "searchbar" name = "searchbar" placeholder = "Search this book ..." aria-controls = "searchresults-outer" aria-describedby = "searchresults-header" >
< / form >
< div id = "searchresults-outer" class = "searchresults-outer hidden" >
< div id = "searchresults-header" class = "searchresults-header" > < / div >
< ul id = "searchresults" >
< / ul >
< / div >
< / div >
<!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM -->
< script >
document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible');
document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible');
Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) {
link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1);
});
< / script >
< div id = "content" class = "content" >
< main >
< h1 id = "adding-injection-queries" > < a class = "header" href = "#adding-injection-queries" > Adding Injection Queries< / a > < / h1 >
< p > Writing language injection queries allows one to highlight a specific node as a different language.
In addition to the < a href = "http://tree-sitter.github.io/tree-sitter/syntax-highlighting#language-injection" > standard< / a > language injection options used by tree-sitter, there
are a few Helix specific extensions that allow for more control.< / p >
< p > And example of a simple query that would highlight all strings as bash in Nix:< / p >
< pre > < code class = "language-scm" > ((string_expression (string_fragment) @injection.content)
(#set! injection.language " bash" ))
< / code > < / pre >
< h2 id = "capture-types" > < a class = "header" href = "#capture-types" > Capture Types< / a > < / h2 >
< ul >
< li >
< p > < code > @injection.language< / code > (standard):
The captured node may contain the language name used to highlight the node captured by
< code > @injection.content< / code > .< / p >
< / li >
< li >
< p > < code > @injection.content< / code > (standard):
Marks the content to be highlighted as the language captured with < code > @injection.language< / code > < em > et al< / em > .< / p >
< / li >
< li >
< p > < code > @injection.filename< / code > (extension):
The captured node may contain a filename with a file-extension known to Helix,
highlighting < code > @injection.content< / code > as that language. This uses the language extensions defined in
both the default languages.toml distributed with Helix, as well as user defined languages.< / p >
< / li >
< li >
< p > < code > @injection.shebang< / code > (extension):
The captured node may contain a shebang used to choose a language to highlight as. This also uses
the shebangs defined in the default and user < code > languages.toml< / code > .< / p >
< / li >
< / ul >
< h2 id = "settings" > < a class = "header" href = "#settings" > Settings< / a > < / h2 >
< ul >
< li >
< p > < code > injection.combined< / code > (standard):
Indicates that all the matching nodes in the tree should have their content parsed as one
nested document.< / p >
< / li >
< li >
< p > < code > injection.language< / code > (standard):
Forces the captured content to be highlighted as the given language< / p >
< / li >
< li >
< p > < code > injection.include-children< / code > (standard):
Indicates that the content node’
nodes. By default, child nodes’ < / p >
< / li >
< li >
< p > < code > injection.include-unnamed-children< / code > (extension):
Same as < code > injection.include-children< / code > but only for unnamed child nodes.< / p >
< / li >
< / ul >
< h2 id = "predicates" > < a class = "header" href = "#predicates" > Predicates< / a > < / h2 >
< ul >
< li >
< p > < code > #eq?< / code > (standard):
The first argument (a capture) must be equal to the second argument
(a capture or a string).< / p >
< / li >
< li >
< p > < code > #match?< / code > (standard):
The first argument (a capture) must match the regex given in the
second argument (a string).< / p >
< / li >
< / ul >
< / main >
< nav class = "nav-wrapper" aria-label = "Page navigation" >
<!-- Mobile navigation buttons -->
< a rel = "prev" href = "../guides/indent.html" class = "mobile-nav-chapters previous" title = "Previous chapter" aria-label = "Previous chapter" aria-keyshortcuts = "Left" >
< i class = "fa fa-angle-left" > < / i >
< / a >
< div style = "clear: both" > < / div >
< / nav >
< / div >
< / div >
< nav class = "nav-wide-wrapper" aria-label = "Page navigation" >
< a rel = "prev" href = "../guides/indent.html" class = "nav-chapters previous" title = "Previous chapter" aria-label = "Previous chapter" aria-keyshortcuts = "Left" >
< i class = "fa fa-angle-left" > < / i >
< / a >
< / nav >
< / div >
< script >
window.playground_copyable = true;
< / script >
< script src = "../elasticlunr.min.js" > < / script >
< script src = "../mark.min.js" > < / script >
< script src = "../searcher.js" > < / script >
< script src = "../clipboard.min.js" > < / script >
< script src = "../highlight.js" > < / script >
< script src = "../book.js" > < / script >
<!-- Custom JS scripts -->
< / div >
< / body >
< / html >
