A high-performance LaTeX mathematical formula parsing and rendering library developed based on Kotlin Multiplatform (KMP). It supports consistent rendering effects on Android, iOS, Desktop (JVM), and Web (Wasm/JS) platforms.

中文版本

• Full Syntax Support: Covers 100+ Greek letters, basic arithmetic, matrices, and environments (align, cases, array, etc.).
• Custom Commands: Supports \newcommand macro definitions, including parameter replacement (#1-#9), nested definitions, and command overriding.
• High-Performance Parsing: AST-based recursive descent parser with support for incremental updates.
• Multi-platform Consistency: Uses Compose Multiplatform for cross-platform UI rendering.
• Chemical Formula Support: Built-in support for the \ce{...} plugin.
• Style Customization: Supports colors (\color), boxes (\boxed), and math mode switching (\displaystyle, etc.).
• Automatic Line Breaking: Smart line wrapping for long formulas at logical breakpoints (operators, relations).
• Image Export: Export rendered formulas as PNG/JPEG/WEBP images with configurable resolution scaling.
• Accessibility: Built-in screen reader support with MathSpeak-style formula descriptions.
• WYSIWYG Editor (Experimental): Built-in LaTeX editor with cursor positioning, tap-to-place, and real-time rendered preview.

The project includes a Demo App (composeApp/androidApp) showcasing various complex LaTeX scenarios:

Basic Math	Chemical Formulas	Incremental Parsing
Basic Math Rendering	Supports \ce{...} syntax	Real-time preview for incomplete input

In a Compose Multiplatform project, you can use the Latex component directly. The component handles incremental parsing automatically and supports real-time preview:

import com.hrm.latex.renderer.Latex
import com.hrm.latex.renderer.model.LatexConfig
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.unit.sp

@Composable
fun MyScreen() {
    Latex(
        latex = "\\frac{-b \\pm \\sqrt{b^2 - 4ac}}{2a}",
        config = LatexConfig(
            fontSize = 20.sp,
            color = Color.Black,
            darkColor = Color.White // Automatic dark mode support
        )
    )
}

For long formulas that need to wrap within the container width, use LatexAutoWrap:

import com.hrm.latex.renderer.LatexAutoWrap

@Composable
fun MyScreen() {
    LatexAutoWrap(
        latex = "E = mc^2 + \\frac{p^2}{2m} + V(x) + \\frac{1}{2}kx^2",
        modifier = Modifier.fillMaxWidth(),
        config = LatexConfig(fontSize = 20.sp)
    )
}

Line breaks occur at mathematically valid points: relation operators (=, <, >), then additive operators (+, -), then multiplicative operators (×, ÷). Atomic structures like fractions, roots, and matrices are never broken.

Export rendered LaTeX formulas as PNG, JPEG, or WEBP images. Use rememberLatexExporter() in a Composable scope, then call export() on a background thread:

import com.hrm.latex.renderer.export.*
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch

@Composable
fun MyScreen() {
    val exporter = rememberLatexExporter()
    val scope = rememberCoroutineScope()

    Button(onClick = {
        scope.launch(Dispatchers.Default) {
            // Export as PNG (default, 2x resolution)
            val result = exporter.export("E = mc^2")
            val pngBytes = result?.bytes       // PNG byte array
            val bitmap = result?.imageBitmap    // For in-app display

            // Export as JPEG (3x resolution, quality 85)
            val jpegResult = exporter.export(
                latex = "\\frac{a}{b}",
                exportConfig = ExportConfig(
                    scale = 3f,
                    format = ImageFormat.JPEG,
                    quality = 85
                )
            )

            // Export with transparent background (PNG only)
            val transparentResult = exporter.export(
                latex = "x^2 + y^2 = r^2",
                exportConfig = ExportConfig(transparentBackground = true)
            )
        }
    }) {
        Text("Export")
    }
}

ExportConfig parameters:

The library provides built-in accessibility support for screen readers. When enabled, each Latex component exposes a MathSpeak-style natural language description via Compose semantics, making math formulas readable by TalkBack (Android), VoiceOver (iOS), and other assistive technologies.

Latex(
    latex = "\\frac{1}{2}",
    config = LatexConfig(accessibilityEnabled = true)
)
// Screen reader reads: "fraction: 1 over 2"

The AccessibilityVisitor converts the LaTeX AST into descriptive text covering fractions, roots, superscripts/subscripts, matrices, Greek letters, operators, and more.

Note: The editor API is experimental and may change in future versions. All editor APIs require the @ExperimentalComposeUiApi annotation.

The library includes a built-in WYSIWYG (What You See Is What You Get) LaTeX editor component. Users can edit LaTeX source text and see the rendered formula in real-time, with cursor position synchronized between the source and the rendered output.

@OptIn(ExperimentalComposeUiApi::class)
@Composable
fun MyEditor() {
    val editorState = rememberEditorState(initialText = "x^{2} + y^{2} = r^{2}")

    LatexEditor(
        editorState = editorState,
        config = LatexConfig(fontSize = 20.sp),
        showSourceText = true // Show source text input field
    )
}

Add dependencies in gradle/libs.versions.toml:

[versions]
latex = "1.1.1"

[libraries]
latex-base = { module = "io.github.huarangmeng:latex-base", version.ref = "latex" }
latex-parser = { module = "io.github.huarangmeng:latex-parser", version.ref = "latex" }
latex-renderer = { module = "io.github.huarangmeng:latex-renderer", version.ref = "latex" }

Reference in your module's build.gradle.kts:

dependencies {
    implementation(libs.latex.base) // Basic logging
    implementation(libs.latex.renderer) // Rendering logic
    implementation(libs.latex.parser) // Parsing logic
}

• :latex-base: Base data structures and interfaces.
• :latex-parser: Core parsing engine, responsible for converting LaTeX strings to AST.
• :latex-renderer: Responsible for rendering AST into Compose UI components.
• :latex-preview: Preview components and sample datasets.
• :composeApp: Cross-platform Demo application.
• :androidApp: Android Demo application.

• Android: ./gradlew :androidApp:assembleDebug
• Desktop: ./gradlew :composeApp:run
• Web (Wasm): ./gradlew :composeApp:wasmJsBrowserDevelopmentRun
• iOS: Open iosApp/iosApp.xcworkspace in Xcode to run.

./run_parser_tests.sh

For a detailed list of supported features, please refer to: PARSER_COVERAGE_ANALYSIS.md

• KaTeX — This project uses font files from KaTeX for mathematical formula rendering. KaTeX is licensed under the MIT License.

This project is licensed under the MIT License - see the LICENSE file for details.

MIT License

Copyright (c) 2026 huarangmeng

Permission is hereby granted, free of charge, to any person obtaining a copy
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The above copyright notice and this permission notice shall be included in all
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SOFTWARE.