Top Alternatives to TSynAnySyn for Advanced Code Editing Components

Step-by-Step Tutorial: Building Custom Language Parsers with TSynAnySyn

Delphi and Lazarus developers often need to add custom syntax highlighting to their applications. While writing a full scanner from scratch is complex, the SynEdit component suite offers a powerful shortcut: TSynAnySyn. This component allows you to build a custom language parser by simply defining rules through properties, completely bypassing the need to write complex parsing code.

Here is a step-by-step guide to building your own language parser using TSynAnySyn. 1. Understand the Role of TSynAnySyn

TSynAnySyn is a multi-purpose, rule-based highlighter component designed for SynEdit. Instead of hardcoding tokenization logic, you configure lists of keywords, identifiers, string delimiters, and comment markers. It is ideal for proprietary scripting languages, config files, or niche domain-specific languages (DSLs) where a full-blown custom highlighter class is overkill. 2. Drop the Components onto Your Form

To get started, open your IDE (Delphi or Lazarus) and set up the visual components:

Drop a TSynEdit component onto your form and set its Align property to alClient. Drop a TSynAnySyn component onto the form.

Select the TSynEdit component, locate its Highlighter property in the Object Inspector, and link it to your TSynAnySyn instance. 3. Configure Basic Token Definitions

Select the TSynAnySyn component to configure how it identifies basic text structures. Modify the following properties in the Object Inspector:

StringDelim: Set this to specify how strings are enclosed. For single quotes, use sdSingleQuote. For double quotes, use sdDoubleQuote.

IdentifierChars: Define which characters can make up a variable or function name. By default, this includes alphanumeric characters and underscores (a-z, A-Z, 0-9, _).

KeyWords: Click the ellipsis button to open the string list editor. Enter your language’s reserved words (e.g., if, then, else, while, return), putting each keyword on a new line. 4. Define Comment Styles

Languages handle comments differently, and TSynAnySyn can process multiple styles simultaneously:

Line Comments: Find the Comments property sub-options. Set LineComment to the characters that start a single-line comment (e.g., // for C-style or # for Python-style).

Block Comments: Set BlockCommentBeg to the starting sequence (e.g., / or {) and BlockCommentEnd to the closing sequence (e.g., */ or }). 5. Customize Visual Styles (Attributes)

TSynAnySyn manages visual styles through SynAttributes. Expand properties like KeyAttri (Keywords), CommentAttri (Comments), StringAttri (Strings), and IdentifierAttri (Identifiers) to customize their appearance:

Foreground: Change the text color (e.g., green for comments, blue for keywords). Background: Set a background color highlight if needed.

Style: Modify font styles to include bold, italic, or underline (e.g., making keywords bold). 6. Handle Objects and Active Highlighting

If your custom language supports object-oriented notation (like object.method), configure the object properties:

ObjectAttri: Customize the visual appearance of object names.

Objects: Input specific object names or class names that should trigger this styling.

Once these properties are filled, paste some sample text into your TSynEdit control at runtime. The text will instantly parse and highlight according to your rules. If you want to expand on this implementation,

Learn how to handle nested comments or complex string escaping. Export the highlighted text to HTML or RTF format. Tell me which advanced feature you want to explore next!