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package tm4java.benchmark;

import org.openjdk.jmh.annotations.*;

import org.openjdk.jmh.runner.Runner;

import org.openjdk.jmh.runner.options.OptionsBuilder;

import tm4java.grammar.IGrammar;

import tm4java.grammar.IGrammarSource;

import tm4java.grammar.IStateStack;

import tm4java.internal.utils.Resources;

import tm4java.registry.Registry;

import java.util.Arrays;

import java.util.concurrent.TimeUnit;

@State(Scope.Thread)

@BenchmarkMode(Mode.Throughput)

@OutputTimeUnit(TimeUnit.SECONDS)

@Warmup(iterations = 5, time = 2, timeUnit = TimeUnit.SECONDS)

@Measurement(iterations = 5, time = 2, timeUnit = TimeUnit.SECONDS)

@Fork(value = 2)

public class GrammarBenchmark {

private IGrammar grammar;

private String[] sourceCode;

@Setup

public void setup() throws Exception {

grammar = new Registry().addGrammar(

IGrammarSource.fromResource(GrammarBenchmark.class, "GrammarBenchmark.Java.tmLanguage.json")

);

try (var sourceFileReader =

Resources.getReader(GrammarBenchmark.class, "GrammarBenchmark.JavaFile.txt")) {

sourceCode = sourceFileReader.lines().toArray(String[]::new);

}

System.out.printf("Source Code chars: %,d%n", Arrays.stream(sourceCode).mapToInt(String::length).sum());

System.out.printf("Source Code lines: %,d%n", sourceCode.length);

}

/** Tokenize all lines of the preloaded source file. */

@Benchmark

public IStateStack tokenizeGrammar() {

IStateStack state = null;

for (var line : sourceCode) {

state = grammar.tokenizeLine(line, state, null).ruleStack();

}

return state;

}

static void main(String[] args) throws Exception {

var opt = new OptionsBuilder()

.include(GrammarBenchmark.class.getSimpleName())

.addProfiler("gc")

.build();

new Runner(opt).run();

}