generateLexer/generateParser gradle tasks problem in intellij idea plugin build - gradle

Question

I try to extend some old IntelliJ plug-in
And there is my build.gradle
buildscript {
ext.kotlin_version = '1.6.0'
repositories {
mavenCentral()
maven { url 'https://jitpack.io'}
maven {
url "https://oss.sonatype.org/content/repositories/snapshots/"
}
maven {
url 'https://dl.bintray.com/jetbrains/intellij-plugin-service'
}
maven {
url "https://plugins.gradle.org/m2/"
}
}
dependencies {
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}
}
plugins {
id "org.jetbrains.intellij" version "0.5.0"
id "org.jetbrains.grammarkit" version "2022.3"
}
group 'com.interfaced'
version '0.2.7'
apply plugin: 'kotlin'
apply plugin: 'org.jetbrains.intellij'
sourceSets {
all {
java.srcDirs += ['src/main/gen']
kotlin.srcDirs += ['src/main/kotlin']
resources.srcDirs = ['src/main/resources']
}
}
grammarKit {
jflexRelease = '1.7.0-2'
}
repositories {
mavenCentral()
maven {
url "https://packages.jetbrains.team/maven/p/ij/intellij-dependencies/"
}
}
dependencies {
// https://mvnrepository.com/artifact/org.jetbrains.kotlin/kotlin-stdlib
implementation group: 'org.jetbrains.kotlin', name: 'kotlin-stdlib', version: '1.7.22'
implementation group: 'junit', name: 'junit', version: '4.12'
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7"
}
intellij {
pluginName 'BrightScript'
version '2022.3'
}
patchPluginXml {
changeNotes """
<ul>
<li>Support for 2020.2</li>
</ul>
"""
}
import org.jetbrains.grammarkit.tasks.*
def GENERATE_GROUP = 'Generate'
task generateLexer(type: GenerateLexer) {
source = "src/main/grammar/BrightScript.flex"
targetDir = "src/main/gen/com/interfaced/brs/lang/lexer"
targetClass = "_BrsLexer"
skeleton = "src/main/grammar/idea-flex.skeleton"
purgeOldFiles = true
description = 'Generate Lexer Java sources for BrightScript'
group = GENERATE_GROUP
}
task generateParser(type: GenerateParser) {
source = "src/main/grammar/BrightScript.bnf"
targetRoot = 'src/main/gen'
pathToParser = 'src/main/gen/com/interfaced/brs/lang/BrsParser.java'
pathToPsiRoot = 'src/main/gen/com/interfaced/brs/lang/psi'
purgeOldFiles = true
description = 'Generate Parser Java sources for BrightScript'
group = GENERATE_GROUP
// patch up to date check
outputs.upToDateWhen { false }
}
compileKotlin {
kotlinOptions.jvmTarget = "17"
}
compileKotlin.dependsOn(generateLexer, generateParser)
When I try to run it have the following output
org.gradle.api.GradleScriptException: A problem occurred evaluating
root project 'brs-plugin'. at ... Caused by:
groovy.lang.MissingPropertyException: Could not get unknown property
'GenerateLexer' for root project 'brs-plugin' of type
org.gradle.api.Project.
But when I try to change my buildLexer/buildParser tasks as following
generateLexer {
source = "src/main/grammar/BrightScript.flex"
targetDir = "src/main/gen/com/interfaced/brs/lang/lexer"
targetClass = "_BrsLexer"
skeleton = "src/main/grammar/idea-flex.skeleton"
purgeOldFiles = true
description = 'Generate Lexer Java sources for BrightScript'
group = GENERATE_GROUP
}
generateParser {
source = "src/main/grammar/BrightScript.bnf"
targetRoot = 'src/main/gen'
pathToParser = 'src/main/gen/com/interfaced/brs/lang/BrsParser.java'
pathToPsiRoot = 'src/main/gen/com/interfaced/brs/lang/psi'
purgeOldFiles = true
description = 'Generate Parser Java sources for BrightScript'
group = GENERATE_GROUP
// patch up to date check
outputs.upToDateWhen { false }
}
have another one problem
A problem occurred evaluating root project 'brs-plugin'. ... Caused
by: java.lang.IllegalArgumentException: Cannot set the value of task
':generateLexer' property 'skeleton' of type
org.gradle.api.file.RegularFile
How to fix my problem?
Regards