vscode-rrebnf

This VSCode extension provides Extended Backus–Naur Form syntax highlighting.

Grammar is taken from Railroad Diagram Generator

Features

• Provides syntax highlighting for files with extension '.ebnf'

• Colours maybe customized by adopting settings.json

Screenshot above was taken with using the following theme customization:

{
    "editor.tokenColorCustomizations": {
        "textMateRules": [
            {
                "scope": "entity.name.declaration.ebnf",
                "settings": {
                    "foreground": "#ff9404",
                    "fontStyle": "bold"
                }
            },
            {
                "scope": "entity.name.ebnf",
                "settings": {
                    "foreground": "#4ea5b6",
                }
            },
            {
                "scope": "keyword.operator.new.ebnf",
                "settings": {
                    "foreground": "#3875d7",
                }
            },
            {
                "scope": "keyword.operator.alternative.ebnf",
                "settings": {
                    "foreground": "#b4e4fd",
                }
            },
            {
                "scope": "keyword.operator.quantifier.ebnf",
                "settings": {
                    "foreground": "#c0a0f3",
                    "fontStyle": "bold"
                }
            },
            {
                "scope": "keyword.operator.difference.ebnf",
                "settings": {
                    "foreground": "#7cbdf1",
                }
            },
        ]
    }
}

• Provides diagnostics
  • Used but undefined tokens

• Redefined tokens

Requirements

• It is required to split every rule with blank line
• requires HyperScopes extension installed

Extension Settings

• No settings provided

Known Issues

• Grammar doesn't recognize links
• Used non standard token classes
• HyperScopes extension works not perfectly and provides not reliable output (hscopes/issues/2). Diagnostics features may require another approach for implementation.

Release Notes

0.0.4

• include guard support (ifndef define endif)
• tests

0.0.3

• support for preprocessor directive #include

0.0.2

• experimental diagnostics implementation

0.0.1

• initial release with more or less stable tokenization

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Links which were useful during development

• syntax: ONIG_SYNTAX_ONIGURUMA (default syntax)
• rubular
• A guide to writing a language grammar (TextMate) in Atom
• Writing a TextMate Grammar: Some Lessons Learned
• Notes on how to create a Language Grammar and Custom Theme for a Textmate Bundle