mirror of https://github.com/shadowfacts/ekt.git
179 lines
5.2 KiB
Kotlin
179 lines
5.2 KiB
Kotlin
package net.shadowfacts.ekt
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import java.io.File
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import javax.script.ScriptContext
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import javax.script.ScriptEngineManager
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import javax.script.SimpleScriptContext
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/**
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* @author shadowfacts
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*/
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object EKT {
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private val startControlCodes: Map<String, (String) -> String> = mapOf(
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":" to { s -> s },
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"=" to { s -> ")" + s },
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"#" to { s -> "*/" + s }
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)
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private val endControlCodes: Map<String, (String) -> String> = mapOf(
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":" to { s -> s },
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"=" to { s -> s + "echo(" },
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"#" to { s -> s + "/*" }
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)
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private val startStringRegex = Regex("([:=#])]")
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private val endStringRegex = Regex("\\[([:=#])")
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private val scriptPrefix = """
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val _env = bindings["_env"] as net.shadowfacts.ekt.EKT.TemplateEnvironment
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val _result = StringBuilder()
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fun echo(it: Any) { _result.append(it) }
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fun include(include: String) {
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val env = net.shadowfacts.ekt.EKT.TemplateEnvironment(include, _env)
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echo(net.shadowfacts.ekt.EKT.render(env, env.include))
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}
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"""
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private val scriptSuffix = """
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_result.toString()
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"""
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private val engine by lazy {
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ScriptEngineManager().getEngineByExtension("kts")
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}
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fun render(env: TemplateEnvironment, template: String = env.template): String {
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if (env.cacheDir != null && env.cacheFile.exists()) {
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return eval(env.cacheFile.readText(Charsets.UTF_8), env)
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}
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@Suppress("NAME_SHADOWING")
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var template = template
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template = template.replace("$", "\${'$'}")
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template = ":]$template[:"
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template = template.replace(startStringRegex, {
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val c = it.groups[1]!!.value
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if (c in startControlCodes) {
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startControlCodes[c]!!("\necho(\"\"\"")
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} else {
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throw RuntimeException("Unknown control code: [$c")
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}
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})
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template = template.replace(endStringRegex, {
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val c = it.groups[1]!!.value
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if (c in endControlCodes) {
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endControlCodes[c]!!("\"\"\")\n")
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} else {
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throw RuntimeException("Unknown control code: $c]")
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}
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})
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// Hack to allow data to be accessed by name from template instead of via bindings map
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val unwrapBindings = env.data.keys.map {
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val type = env.data[it]!!.type
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"val $it = (bindings[\"$it\"] as net.shadowfacts.ekt.EKT.TypedValue).value as $type"
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}.joinToString("\n")
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val script = unwrapBindings + scriptPrefix + template + scriptSuffix
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if (env.cacheDir != null) {
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env.cacheFile.apply {
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if (!parentFile.exists()) parentFile.mkdirs()
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if (!exists()) createNewFile()
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writeText(script, Charsets.UTF_8)
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}
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}
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return eval(script, env)
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}
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fun render(name: String, templateDir: File, includeDir: File, cacheDir: File? = null, data: Map<String, TypedValue>): String {
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return render(TemplateEnvironment(name, templateDir, includeDir, cacheDir, data))
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}
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fun render(name: String, templateDir: File, includeDir: File, cacheDir: File? = null, init: DataProvider.() -> Unit): String {
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return render(TemplateEnvironment(name, templateDir, includeDir, cacheDir, init))
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}
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fun render(name: String, dir: File, cacheScripts: Boolean = false, data: Map<String, TypedValue>): String {
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return render(name, dir, File(dir, "includes"), if (cacheScripts) File(dir, "cache") else null, data)
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}
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fun render(name: String, dir: File, cacheScripts: Boolean = false, init: DataProvider.() -> Unit): String {
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return render(name, dir, File(dir, "includes"), if (cacheScripts) File(dir, "cache") else null, init)
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}
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internal fun eval(script: String, env: TemplateEnvironment): String {
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engine.context = SimpleScriptContext()
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val bindings = engine.getBindings(ScriptContext.ENGINE_SCOPE)
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bindings.putAll(env.data)
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bindings.put("_env", env)
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return engine.eval(script) as String
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}
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class TemplateEnvironment {
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val rootName: String
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val name: String
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val templateDir: File
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val includeDir: File
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val cacheDir: File?
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val data: Map<String, TypedValue>
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val template: String
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get() = File(templateDir, "$name.ekt").readText(Charsets.UTF_8)
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val include: String
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get() = File(includeDir, "$name.ekt").readText(Charsets.UTF_8)
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val cacheFile: File
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get() = File(cacheDir!!, "$name.kts")
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constructor(name: String, templateDir: File, includeDir: File, cacheDir: File?, data: Map<String, TypedValue>) {
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this.rootName = name
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this.name = name
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this.templateDir = templateDir
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this.includeDir = includeDir
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this.cacheDir = cacheDir
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this.data = data
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}
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constructor(name: String, templateDir: File, includeDir: File, cacheDir: File?, init: DataProvider.() -> Unit):
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this(name, templateDir, includeDir, cacheDir, DataProvider.init(init))
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constructor(name: String, parent: TemplateEnvironment) {
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this.rootName = parent.rootName
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this.name = name
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this.templateDir = parent.templateDir
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this.includeDir = parent.includeDir
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this.cacheDir = parent.cacheDir
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this.data = parent.data
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}
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}
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class DataProvider {
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internal val map = mutableMapOf<String, TypedValue>()
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infix fun String.to(value: Any) {
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if (value is TypedValue) {
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map[this] = value
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} else {
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map[this] = TypedValue(value, value::class.qualifiedName!!)
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}
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}
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infix fun Any.asType(type: String): TypedValue {
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return TypedValue(this, type)
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}
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companion object {
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fun init(init: DataProvider.() -> Unit): Map<String, TypedValue> {
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val ctx = DataProvider()
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ctx.init()
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return ctx.map
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}
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}
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}
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data class TypedValue(val value: Any, val type: String)
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} |