Bootstrap script for ANTLR 4

antlr4.ps1

$dp0 = $PSScriptRoot
$version = '4.13.1'

$jar = "antlr-$version-complete.jar"
$url = "https://www.antlr.org/download/$jar"

if (-not (Test-Path "$dp0/$jar")) {
    Invoke-WebRequest -Uri $url -OutFile "$dp0/$jar"
}

$JAVA_PATH = $env:JAVA_HOME_11 ?? $env:JAVA_HOME
$JAVA_EXEC = ($null -eq $JAVA_PATH) ? "java" : "$JAVA_PATH\bin\java.exe"

Write-Host -ForegroundColor Green ">>> $JAVA_EXEC -jar $dp0/$jar $args"

& "$JAVA_EXEC" "-version"
& "$JAVA_EXEC" "-jar" "$dp0/$jar" $args