mirror of https://github.com/shadowfacts/ekt.git
115 lines
3.0 KiB
Kotlin
115 lines
3.0 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 _result = StringBuilder()
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fun echo(s: Any) { _result.append(s) }
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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 manager by lazy {
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ScriptEngineManager()
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}
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private val engine by lazy {
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manager.getEngineByExtension("kts")
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}
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fun render(template: String, dumpGeneratedScript: File? = null, dataProvider: DataProviderContext.() -> Unit): String {
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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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val script = scriptPrefix + template + scriptSuffix
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dumpGeneratedScript?.apply {
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if (!exists()) createNewFile()
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writeText(script)
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}
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val data = DataProviderContext()
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data.dataProvider()
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return eval(script, data.map) as String
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}
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fun render(template: File, dumpGeneratedScript: File? = null, dataProvider: DataProviderContext.() -> Unit): String {
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return render(template.readText(), dumpGeneratedScript, dataProvider)
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}
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internal fun eval(script: String, data: Map<String, TypedValue> = mapOf()): Any? {
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engine.context = SimpleScriptContext()
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val bindings = engine.getBindings(ScriptContext.ENGINE_SCOPE)
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bindings.putAll(data)
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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 = data.keys.map {
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val type = 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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engine.eval(unwrapBindings)
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return engine.eval(script)
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}
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class DataProviderContext {
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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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}
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data class TypedValue(val value: Any, val type: String)
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} |