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package ru.noties.prism4j.bundler;
import android.support.annotation.NonNull;
import com.google.googlejavaformat.java.Formatter;
import com.google.googlejavaformat.java.FormatterException;
import com.google.googlejavaformat.java.JavaFormatterOptions;
import org.apache.commons.io.IOUtils;
import java.io.IOException;
import java.io.Writer;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import javax.annotation.processing.AbstractProcessor;
import javax.annotation.processing.Filer;
import javax.annotation.processing.Messager;
import javax.annotation.processing.ProcessingEnvironment;
import javax.annotation.processing.RoundEnvironment;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.Element;
import javax.lang.model.element.PackageElement;
import javax.lang.model.element.TypeElement;
import javax.lang.model.util.Elements;
import javax.tools.JavaFileObject;
import ix.Ix;
import ru.noties.prism4j.annotations.PrismBundle;
import static javax.tools.Diagnostic.Kind.ERROR;
import static javax.tools.Diagnostic.Kind.NOTE;
public class PrismBundler extends AbstractProcessor {
private static final String LANGUAGES_PACKAGE = "ru.noties.prism4j.languages";
private static final String LANGUAGE_SOURCE_PATTERN = "languages/ru/noties/prism4j/languages/Prism_%1$s.java";
private static final String TEMPLATE_PACKAGE_NAME = "{{package-name}}";
private static final String TEMPLATE_IMPORTS = "{{imports}}";
private static final String TEMPLATE_CLASS_NAME = "{{class-name}}";
private static final String TEMPLATE_REAL_LANGUAGE_NAME = "{{real-language-name}}";
private static final String TEMPLATE_OBTAIN_GRAMMAR = "{{obtain-grammar}}";
private static final String TEMPLATE_TRIGGER_MODIFY = "{{trigger-modify}}";
private final AnnotationsInformation annotationsInformation = AnnotationsInformation.create();
private Messager messager;
private Elements elements;
private Filer filer;
// this override might've killed me... without it processor cannot find ANY resources...
@Override
public Set getSupportedOptions() {
return Collections.emptySet();
}
@Override
public Set getSupportedAnnotationTypes() {
return Collections.singleton(PrismBundle.class.getName());
}
@Override
public SourceVersion getSupportedSourceVersion() {
return SourceVersion.RELEASE_7;
}
@Override
public synchronized void init(ProcessingEnvironment processingEnvironment) {
super.init(processingEnvironment);
messager = processingEnvironment.getMessager();
elements = processingEnvironment.getElementUtils();
filer = processingEnvironment.getFiler();
}
@Override
public boolean process(Set set, RoundEnvironment roundEnvironment) {
if (!roundEnvironment.processingOver()) {
final long start = System.currentTimeMillis();
final Set elements = roundEnvironment.getElementsAnnotatedWith(PrismBundle.class);
// generate locator for each annotated element
// extract languages that are used by each locator
// then write them
if (elements != null) {
final Set languages = new HashSet<>();
for (Element element : elements) {
if (element != null) {
languages.addAll(process(element));
}
}
if (languages.size() > 0) {
writeLanguages(languages);
}
}
final long end = System.currentTimeMillis();
messager.printMessage(NOTE, "[prism4j-bundler] Processing took: " + (end - start) + " ms");
}
return false;
}
// we must return a set of languageInfos here (so we do not copy language more than once
// thus allowing multiple grammarLocators)
@NonNull
private Set process(@NonNull Element element) {
final PrismBundle bundle = element.getAnnotation(PrismBundle.class);
if (bundle == null) {
return Collections.emptySet();
}
final Map languages;
{
final List names = processLanguageNames(bundle.include());
final int size = names.size();
if (size > 0) {
languages = new LinkedHashMap<>(size);
for (String name : names) {
languageInfo(languages, name);
}
} else {
languages = null;
}
}
if (languages == null
|| languages.size() == 0) {
throw new RuntimeException("No languages are specified to be included");
}
final String template = grammarLocatorTemplate();
final ClassInfo classInfo = classInfo(element, bundle.name());
final String source = grammarLocatorSource(template, classInfo, languages);
Writer writer = null;
try {
final JavaFileObject javaFileObject = filer.createSourceFile(classInfo.packageName + "." + classInfo.className);
writer = javaFileObject.openWriter();
writer.write(source);
} catch (IOException e) {
throw new RuntimeException(e);
} finally {
if (writer != null) {
try {
writer.close();
} catch (IOException e) {
// no op
}
}
}
return new HashSet<>(languages.values());
// first obtain all languages from annotation `include` parameter
// then validate that such a language is present in `languages` folder
// then parse @Language annotation of a language source file
// additionally check for extend clause and add parent language to compilation also (and then again recursively)
// then just copy all requested language files
// then generate a grammarLocator implementation
// include all languages and additionally generate aliases information
// so, to start we generate a map of languages to include
}
private void writeLanguages(@NonNull Set languages) {
for (LanguageInfo info : languages) {
Writer writer = null;
try {
final JavaFileObject javaFileObject = filer.createSourceFile(LANGUAGES_PACKAGE + ".Prism_" + javaValidName(info.name));
writer = javaFileObject.openWriter();
writer.write(info.source);
} catch (IOException e) {
throw new RuntimeException(e);
} finally {
if (writer != null) {
try {
writer.close();
} catch (IOException e) {
// no op
}
}
}
}
}
@NonNull
private List processLanguageNames(@NonNull String[] names) {
return Ix.fromArray(names)
.filter(Objects::nonNull)
.filter(s -> s.length() > 0)
.filter(s -> s.trim().length() > 0)
.toList();
}
private void languageInfo(@NonNull Map map, @NonNull String name) {
if (map.containsKey(name)) {
return;
}
// read info
final String source;
try {
source = IOUtils.resourceToString(languageSourceFileName(name), StandardCharsets.UTF_8, PrismBundler.class.getClassLoader());
} catch (IOException e) {
throw new RuntimeException(String.format(Locale.US, "Unable to read language `%1$s` " +
"source file. Either it is not defined yet or it was referenced as an alias " +
"when specifying extend clause", name), e);
}
final List aliases = annotationsInformation.findAliasesInformation(source);
final String extend = annotationsInformation.findExtendInformation(source);
final List modify = annotationsInformation.findModifyInformation(source);
map.put(name, new LanguageInfo(name, aliases, extend, modify, source));
if (extend != null) {
languageInfo(map, extend);
}
}
@NonNull
private static String languageSourceFileName(@NonNull String name) {
return String.format(Locale.US, LANGUAGE_SOURCE_PATTERN, javaValidName(name));
}
@NonNull
private static String grammarLocatorTemplate() {
try {
return IOUtils.resourceToString("/GrammarLocator.template.java", StandardCharsets.UTF_8);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@NonNull
private ClassInfo classInfo(@NonNull Element element, @NonNull String name) {
final String packageName;
final String className;
if ('.' == name.charAt(0)) {
final PackageElement packageElement = elements.getPackageOf(element);
packageName = packageElement.getQualifiedName().toString();
className = name.substring(1);
} else {
final int index = name.lastIndexOf('.');
if (index < 0) {
// we won't allow _default_ package (aka no package)
messager.printMessage(ERROR, "No package info specified for grammar " +
"locator. In can start with a `dot` to put in the same package or must be " +
"fully specified, for example: `com.mypackage`", element);
throw new RuntimeException("No package info is specified. See error output " +
"for more details");
}
packageName = name.substring(0, index);
className = name.substring(index + 1);
}
return new ClassInfo(packageName, className);
}
@NonNull
private static String grammarLocatorSource(
@NonNull String template,
@NonNull ClassInfo classInfo,
@NonNull Map languages) {
final StringBuilder builder = new StringBuilder(template);
replaceTemplate(builder, TEMPLATE_PACKAGE_NAME, classInfo.packageName);
replaceTemplate(builder, TEMPLATE_IMPORTS, createImports(languages));
replaceTemplate(builder, TEMPLATE_CLASS_NAME, classInfo.className);
replaceTemplate(builder, TEMPLATE_REAL_LANGUAGE_NAME, createRealLanguageName(languages));
replaceTemplate(builder, TEMPLATE_OBTAIN_GRAMMAR, createObtainGrammar(languages));
replaceTemplate(builder, TEMPLATE_TRIGGER_MODIFY, createTriggerModify(languages));
final Formatter formatter = new Formatter(JavaFormatterOptions.defaultOptions());
try {
return formatter.formatSource(builder.toString());
} catch (FormatterException e) {
System.out.printf("source: %n%s%n", builder.toString());
throw new RuntimeException(e);
}
}
private static void replaceTemplate(@NonNull StringBuilder template, @NonNull String name, @NonNull String content) {
final int index = template.indexOf(name);
template.replace(index, index + name.length(), content);
}
@NonNull
private static String createImports(@NonNull Map languages) {
final StringBuilder builder = new StringBuilder();
Ix.from(languages.values())
.map(languageInfo -> languageInfo.name)
.orderBy(String::compareTo)
.foreach(s -> builder
.append("import ")
.append(LANGUAGES_PACKAGE)
.append(".Prism_")
.append(javaValidName(s))
.append(';')
.append('\n'));
return builder.toString();
}
@NonNull
private static String createRealLanguageName(@NonNull Map languages) {
final StringBuilder builder = new StringBuilder();
for (Map.Entry entry : languages.entrySet()) {
final List aliases = entry.getValue().aliases;
if (aliases != null
&& aliases.size() > 0) {
for (String alias : aliases) {
builder.append("case \"")
.append(alias)
.append('\"')
.append(':')
.append('\n');
}
builder.append("out = \"")
.append(entry.getKey())
.append('\"')
.append(';')
.append('\n')
.append("break;\n");
}
}
if (builder.length() > 0) {
builder.append("default:\n")
.append("out = name;\n")
.append("}\nreturn out;");
builder.insert(0, "final String out;\nswitch (name) {");
return builder.toString();
} else {
return "return name;";
}
}
@NonNull
private static String createObtainGrammar(@NonNull Map languages) {
final StringBuilder builder = new StringBuilder();
builder
.append("final Prism4j.Grammar grammar;\n")
.append("switch(name) {\n");
Ix.from(languages.keySet())
.orderBy(String::compareTo)
.foreach(s -> builder.append("case \"")
.append(s)
.append("\":\n")
.append("grammar = Prism_")
.append(javaValidName(s))
.append(".create(prism4j);\nbreak;\n"));
builder.append("default:\ngrammar = null;\n}")
.append("return grammar;");
return builder.toString();
}
@NonNull
private static String createTriggerModify(@NonNull Map languages) {
// so, create a map collection where each entry in `modify` is the key and languageInfo.name is value
final Map> map = new HashMap<>(3);
List modify;
for (LanguageInfo info : languages.values()) {
modify = info.modify;
if (modify != null
&& modify.size() > 0) {
for (String name : modify) {
map.computeIfAbsent(name, k -> new ArrayList<>(3)).add(info.name);
}
}
}
if (map.size() == 0) {
return "";
}
final StringBuilder builder = new StringBuilder();
builder.append("switch(name){\n");
for (Map.Entry> entry : map.entrySet()) {
builder.append("case \"")
.append(entry.getKey())
.append("\":\n");
for (String lang : entry.getValue()) {
builder.append("prism4j.grammar(\"")
.append(lang)
.append("\");\n");
}
builder.append("break;\n");
}
builder.append("}");
return builder.toString();
}
@NonNull
private static String javaValidName(@NonNull String name) {
return name.replaceAll("-", "_");
}
// public static void main(String[] args) {
// final ClassInfo classInfo = new ClassInfo("ru.noties.prism4j.languages", "MyClass");
// final Map languages = new HashMap<>();
// languages.put("clike", new LanguageInfo("clike", null, null, null, ""));
// languages.put("markup", new LanguageInfo("markup", null, null, null, ""));
// System.out.printf("source: %n%s%n", grammarLocatorSource(grammarLocatorTemplate(), classInfo, languages));
// }
}
