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SweetLine iOS Swift API

This document describes the Swift Package SDK in platform/iOS/SweetLine.

Overview

  • Module: SweetLine
  • Platform: iOS 14+
  • Binding style: Swift API over the SweetLine C API and bundled SweetLineCoreIOS.xcframework
  • Demo project: platform/iOS/SweetLineDemo (SwiftUI/UIKit)
  • Package version: 1.2.4

Install

For local development, add this folder as a local Swift Package dependency from an iOS app project:

platform/iOS/SweetLine

Then import the public SDK module:

import SweetLine

Native Artifact

The package uses a local binary target:

.binaryTarget(
    name: "SweetLineCoreIOS",
    path: "Vendor/iOS/SweetLineCoreIOS.xcframework"
)

Refresh the bundled artifact from the repository root:

scripts/build-shared.sh --platform ios
platform/iOS/SweetLine/Scripts/sync-native.sh

For remote SwiftPM distribution, publish SweetLineCoreIOS.xcframework.zip as a release artifact and replace the local binary target with a URL plus checksum.

Core Types

  • HighlightConfig(showIndex:inlineStyle:)
  • HighlightEngine
  • TextAnalyzer
  • Document
  • DocumentAnalyzer
  • TextPosition, TextRange, TextLineInfo, LineRange
  • TokenStyle, TokenSpan, LineHighlight, DocumentHighlight
  • DocumentHighlightSlice
  • IndentGuideLine, IndentGuideResult, LineScopeState
  • SweetLineError, SyntaxCompileError

HighlightEngine

public final class HighlightEngine {
    public init(config: HighlightConfig = HighlightConfig()) throws

    public func registerStyleName(_ styleName: String, id styleId: Int32) throws
    public func getStyleName(id styleId: Int32) throws -> String?
    public func defineMacro(_ macroName: String) throws
    public func undefineMacro(_ macroName: String) throws

    public func compileSyntax(fromJson syntaxJson: String) throws
    public func compileSyntax(fromFile path: String) throws

    public func createAnalyzer(syntaxName: String) throws -> TextAnalyzer?
    public func createAnalyzer(fileName: String) throws -> TextAnalyzer?
    public func loadDocument(_ document: Document) throws -> DocumentAnalyzer?

    public func close()
}

TextAnalyzer

public final class TextAnalyzer {
    public func analyzeText(_ text: String) throws -> DocumentHighlight
    public func analyzeLine(_ text: String, info: TextLineInfo) throws -> LineAnalyzeResult
    public func analyzeIndentGuides(_ text: String) throws -> IndentGuideResult
    public func close()
}

DocumentAnalyzer

public final class DocumentAnalyzer {
    public func analyze() throws -> DocumentHighlight
    public func analyzeLineRange(_ visibleRange: LineRange) throws -> DocumentHighlightSlice
    public func analyzeIncremental(range: TextRange, newText: String) throws -> DocumentHighlight
    public func analyzeIncrementalInLineRange(
        range: TextRange,
        newText: String,
        visibleRange: LineRange
    ) throws -> DocumentHighlightSlice
    public func getHighlightSlice(_ visibleRange: LineRange) throws -> DocumentHighlightSlice
    public func analyzeIndentGuides() throws -> IndentGuideResult
    public func close()
}

analyzeLineRange(...) analyzes enough lines from the current managed document state to satisfy the requested visible range. analyzeIncrementalInLineRange(...) applies a patch and immediately returns the requested slice. getHighlightSlice(...) reads a visible slice from the latest cached result after analyze() or analyzeIncremental(...).

SyntaxCompileError

SyntaxCompileError exposes the same compile error code constants as the Java 22 and C# desktop bindings:

SyntaxCompileError.ok
SyntaxCompileError.jsonPropertyMissed
SyntaxCompileError.jsonPropertyInvalid
SyntaxCompileError.patternInvalid
SyntaxCompileError.stateInvalid
SyntaxCompileError.jsonInvalid
SyntaxCompileError.fileNotExists
SyntaxCompileError.fileInvalid
SyntaxCompileError.importSyntaxNotFound
SyntaxCompileError.stateReferenceNotFound
SyntaxCompileError.inlineStyleReferenceNotFound

Complete Example

import SweetLine

let sourceCode = "struct Demo { let value = 1 }"
let syntaxJson = """
{
  "name": "swift",
  "fileSuffixes": [".swift"],
  "states": {
    "default": [
      { "pattern": "\\\\b(struct|let)\\\\b", "style": "keyword" }
    ]
  }
}
"""

let engine = try HighlightEngine(config: HighlightConfig(showIndex: true, inlineStyle: false))
defer { engine.close() }

try engine.registerStyleName("keyword", id: 1)
try engine.registerStyleName("string", id: 2)
try engine.compileSyntax(fromJson: syntaxJson)

if let textAnalyzer = try engine.createAnalyzer(fileName: "Demo.swift") {
    let preview = try textAnalyzer.analyzeText(sourceCode)
    let line = try textAnalyzer.analyzeLine(sourceCode, info: TextLineInfo(line: 0))
    let guides = try textAnalyzer.analyzeIndentGuides(sourceCode)
    _ = (preview, line, guides)
    textAnalyzer.close()
}

let document = try Document(uri: "file:///Demo.swift", text: sourceCode)
defer { document.close() }

if let analyzer = try engine.loadDocument(document) {
    let initial = try analyzer.analyze()
    let change = TextRange(
        start: TextPosition(line: 0, column: 7),
        end: TextPosition(line: 0, column: 11)
    )
    let updated = try analyzer.analyzeIncremental(range: change, newText: "Sample")
    let cachedVisible = try analyzer.getHighlightSlice(LineRange(startLine: 0, lineCount: 80))
    let visible = try analyzer.analyzeIncrementalInLineRange(
        range: change,
        newText: "Sample",
        visibleRange: LineRange(startLine: 0, lineCount: 80)
    )
    let indentGuides = try analyzer.analyzeIndentGuides()
    _ = (initial, updated, cachedVisible, visible, indentGuides)
    analyzer.close()
}