Awesome
highlightjs-grammar
Transform a JSON grammar into a syntax-highlight mode for Highlight.js
A simple and light-weight (~ 44kB minified, ~ 15kB zipped) Highlight.js add-on
to generate highlightjs-compatible modes from a grammar specification in JSON format.
see also:
- Abacus advanced Combinatorics and Algebraic Number Theory Symbolic Computation library for JavaScript, Python
- Plot.js simple and small library which can plot graphs of functions and various simple charts and can render to Canvas, SVG and plain HTML
- HAAR.js image feature detection based on Haar Cascades in JavaScript (Viola-Jones-Lienhart et al Algorithm)
- HAARPHP image feature detection based on Haar Cascades in PHP (Viola-Jones-Lienhart et al Algorithm)
- FILTER.js video and image processing and computer vision Library in pure JavaScript (browser and node)
- Xpresion a simple and flexible eXpression parser engine (with custom functions and variables support), based on GrammarTemplate, for PHP, JavaScript, Python
- Regex Analyzer/Composer Regular Expression Analyzer and Composer for PHP, JavaScript, Python
- GrammarTemplate grammar-based templating for PHP, JavaScript, Python
- codemirror-grammar transform a formal grammar in JSON format into a syntax-highlight parser for CodeMirror editor
- ace-grammar transform a formal grammar in JSON format into a syntax-highlight parser for ACE editor
- prism-grammar transform a formal grammar in JSON format into a syntax-highlighter for Prism code highlighter
- highlightjs-grammar transform a formal grammar in JSON format into a syntax-highlight mode for Highlight.js code highlighter
- syntaxhighlighter-grammar transform a formal grammar in JSON format to a highlight brush for SyntaxHighlighter code highlighter
- SortingAlgorithms implementations of Sorting Algorithms in JavaScript
- PatternMatchingAlgorithms implementations of Pattern Matching Algorithms in JavaScript
Note: The invariant codebase for all the *-grammar
add-ons resides at editor-grammar repository (used as a git submodule
)
Contents
Todo
see Modularity and Future Directions
- enable grammar add-on to pre-compile a grammar specification directly into mode source code, so it can be used without the add-on as standalone mode [TODO, maybe]
Features
- A
Grammar
can extend otherGrammars
(so arbitraryvariations
anddialects
can be handled more easily) Grammar
includes:Style Model
,Lex Model
andSyntax Model
(optional), plus a couple of settings (see examples)Grammar
specification can be minimal, defaults will be used (see example grammars)Grammar.Syntax Model
can enable highlight in a more context-specific way, plus detect possible syntax errorsGrammar.Syntax Model
can contain recursive referencesGrammar.Syntax Model
can be (fully) specificed usingPEG
-like notation orBNF
-like notation (NEW feature)Grammar.Syntax Model
implements positive / negative lookahead tokens (analogous toPEG
and-
/not-
predicates) (NEW feature)Grammar.Syntax Model
can include external (sub-)grammars so that new multiplexed / mixed grammars are created easily and intuitively (see test examples) (NEW feature)Grammar
can define action tokens to perform complex context-specific parsing functionality, including associated tag matching and duplicate identifiers (see for examplexml.grammar
example) (NEW feature)- Generated highlighters are optimized for speed and size
- Can generate a syntax-highlighter from a grammar interactively and on-the-fly ( see example, http://foo123.github.io/examples/highlightjs-grammar )
- see also Modularity and Future Directions
How to use:
An example for XML:
// 1. a partial xml grammar in simple JSON format
var xml_grammar = {
// prefix ID for regular expressions, represented as strings, used in the grammar
"RegExpID" : "RE::",
// Style model
"Style" : {
"declaration" : "section"
,"doctype" : "template-tag"
,"meta" : "meta"
,"comment" : "comment"
,"cdata" : "literal"
,"atom" : "literal"
,"tag" : "meta"
,"attribute" : "built_in"
,"string" : "string"
,"number" : "number"
},
// Lexical model
"Lex" : {
"comment:comment" : ["<!--", "-->"]
,"declaration:block" : ["<?xml", "?>"]
,"doctype:block" : ["RE::/<!doctype\\b/i", ">"]
,"meta:block" : ["RE::/<\\?[_a-zA-Z][\\w\\._\\-]*/", "?>"]
,"cdata:block" : ["<![CDATA[", "]]>"]
,"open_tag" : "RE::/<([_a-zA-Z][_a-zA-Z0-9\\-]*)/"
,"close_tag" : "RE::/<\\/([_a-zA-Z][_a-zA-Z0-9\\-]*)>/"
,"attribute" : "RE::/[_a-zA-Z][_a-zA-Z0-9\\-]*/"
,"string:line-block" : [["\""], ["'"]]
,"number" : ["RE::/[0-9]\\d*/", "RE::/#[0-9a-fA-F]+/"]
,"atom" : ["RE::/&#x[a-fA-F\\d]+;/", "RE::/&#[\\d]+;/", "RE::/&[a-zA-Z][a-zA-Z0-9]*;/"]
,"text" : "RE::/[^<&]+/"
// actions
,"tag_ctx:action" : {"context":true}
,"\\tag_ctx:action" : {"context":false}
,"unique_id:action" : {"unique":["xml", "$1"],"msg":"Duplicate id value \"$0\""}
,"unique_att:action" : {"unique":["tag", "$0"],"msg":"Duplicate attribute \"$0\"","in-context":true}
,"tag_opened:action" : {"push":"<$1>","ci":true}
,"tag_closed:action" : {"pop":"<$1>","ci":true,"msg":"Tags \"$0\" and \"$1\" do not match"}
,"tag_autoclosed:action" : {"pop":null}
,"out_of_place:error" : "\"$2$3\" can only be at the beginning of XML document"
},
// Syntax model (optional)
"Syntax" : {
"tag_att" : "'id'.attribute unique_att '=' string unique_id | attribute unique_att '=' (string | number)"
,"start_tag" : "open_tag.tag tag_ctx tag_opened tag_att* ('>'.tag | '/>'.tag tag_autoclosed) \\tag_ctx"
,"end_tag" : "close_tag.tag tag_closed"
,"xml" : "(^^1 declaration? doctype?) (declaration.error out_of_place | doctype.error out_of_place | comment | meta | cdata | start_tag | end_tag | atom | text)*"
},
// what to parse and in what order
"Parser" : [ ["xml"] ]
};
// 2. parse the grammar into a Highlight.js-compatible mode
var xml_mode = HighlightJSGrammar.getMode( xml_grammar );
// 3. use it with Highlight.js
hljs.registerLanguage( "xml", xml_mode );
hljs.highlightBlock( document.getElementById("code") );
Result: