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

• High-Performance Parsing: AST-based recursive descent parser with support for incremental updates.
• Multi-platform Consistency: Uses Compose Multiplatform for consistent rendering on Android, iOS, Desktop (JVM), and Web (Wasm/JS).
• Automatic Line Breaking: Smart line wrapping for long formulas at logical breakpoints (operators, relations).
• Raster & Vector Export: Export formulas as PNG/JPEG/WEBP images or resolution-independent SVG vectors.
• Inline Math API: Create Compose InlineTextContent directly with LatexMeasurerState.inlineContent(), while retaining precise pre-measurement support.
• Accessibility: Built-in screen reader support with MathSpeak-style formula descriptions (MathSpeak).
• LaTeX → MathML: Convert LaTeX AST to Presentation MathML output.
• Formula Highlight: Highlight sub-expressions within formulas via HighlightConfig.
• Animation: Animated formula transitions (crossfade / slide / fade+slide).
• WYSIWYG Editor (Experimental): Built-in LaTeX editor with cursor positioning, tap-to-place, and real-time rendered preview.
• Structured Diagnostics: parseWithDiagnostics() provides 8-category structured diagnostics with severity filtering.
• RTL Support: Complete right-to-left text direction support (\RLE, \LRE, RTL/LTR environments, nesting).

The project includes a Demo App (composeApp/androidApp) showcasing various complex LaTeX scenarios. The preview dataset also contains a dedicated Enclose / menclose group covering circles, boxes, combined borders, strike-throughs, and color/background attributes:

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 com.hrm.latex.renderer.model.LatexTheme
import androidx.compose.ui.unit.sp

@Composable
fun MyScreen() {
    Latex(
        latex = "\\frac{-b \\pm \\sqrt{b^2 - 4ac}}{2a}",
        config = LatexConfig(
            fontSize = 20.sp,
            theme = LatexTheme.auto()
        )
    )
}

The bundled KaTeX TTF set is the renderer's only math-font pipeline. Its Main, Math, AMS, style and Size1–Size4 fonts are loaded together with matching KaTeX metrics, so measurement and drawing always use the same font data.

// Default: bundled KaTeX TTF fonts
LatexConfig()

External font injection is intentionally unsupported because KaTeX's layout metrics are specific to the bundled font files.

Use LatexTheme to control formula foreground/background colors:

import com.hrm.latex.renderer.model.LatexTheme

// Follow system light/dark mode
LatexConfig(theme = LatexTheme.auto())

// Fixed light theme
LatexConfig(theme = LatexTheme.light())

// Fixed dark theme
LatexConfig(theme = LatexTheme.dark())

// Follow current Material 3 ColorScheme
LatexConfig(theme = LatexTheme.material3())

If you need custom colors, build them from LatexThemeColors:

import androidx.compose.ui.graphics.Color
import com.hrm.latex.renderer.model.LatexTheme
import com.hrm.latex.renderer.model.LatexThemeColors

LatexConfig(
    theme = LatexTheme.auto(
        light = LatexThemeColors(
            color = Color(0xFF111111),
            backgroundColor = Color.Transparent
        ),
        dark = LatexThemeColors(
            color = Color(0xFFF5F5F5),
            backgroundColor = Color.Transparent
        )
    )
)

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:

For print, responsive Web embedding, or resolution-independent output, use exportSvg(). It reuses the exact same measure-and-draw pipeline as on-screen rendering and emits vector paths, lines, and shapes—never a raster image wrapped in SVG:

val svgResult = exporter.exportSvg(
    latex = "\\frac{-b \\pm \\sqrt{b^2 - 4ac}}{2a}",
    exportConfig = SvgExportConfig(
        transparentBackground = true,
        textMode = SvgTextMode.PATH
    )
)

val svg = svgResult?.svg       // SVG text for Web embedding
val svgBytes = svgResult?.bytes // UTF-8 bytes for saving or sharing

SvgExportConfig is intentionally separate from raster options:

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.

inlineContent() encapsulates formula pre-measurement, Placeholder sizing, and rendering for direct use with Compose Text:

val measurer = rememberLatexMeasurer(config)
val formula = measurer.inlineContent("\\frac{a}{b}", config)

Text(
    text = buildAnnotatedString {
        append("The fraction ")
        appendInlineContent("formula", "a divided by b")
        append(" represents a divided by b.")
    },
    inlineContent = formula?.let { mapOf("formula" to it) }.orEmpty()
)

For blank input or measurement failure, inlineContent() returns null, allowing Compose to display the alternate text supplied to appendInlineContent(). Repeated calls with the same formula and configuration reuse the LatexMeasurerState cache.

For custom layouts, the lower-level measure() API remains available. LatexDimensions provides widthPx, heightPx, and baselinePx (including padding), plus corresponding content-only fields. Use measureBatch() for batch measurement.

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
    )
}

This library publishes two variants for each release to support different Kotlin/Compose versions:

Choose the variant that matches your project's Kotlin version. If your project uses Kotlin 2.1.0, use the -kt2.1.0 suffixed version.

Add dependencies in gradle/libs.versions.toml:

[versions]
latex = "1.5.0"

[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" }

If your project uses Kotlin 2.1.0, use the -kt2.1.0 suffixed artifacts:

[versions]
latex = "1.5.0-kt2.1.0"

[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 supported features and chapter-specific follow-up items, see PARSER_COVERAGE_ANALYSIS.md.

• KaTeX — This project uses the KaTeX v0.16.11 font files for mathematical formula rendering. See THIRD_PARTY_NOTICES.md for attribution and license details.

• Markdown — A Kotlin Multiplatform Markdown parsing and rendering library by the same author. If you need both LaTeX and Markdown rendering in your project, check it out!

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
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.