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package processing.mode.java.lsp;

import java.io.File;

import java.net.URI;

import java.util.AbstractMap;

import java.util.Arrays;

import java.util.Collections;

import java.util.concurrent.CompletableFuture;

import java.util.concurrent.ExecutionException;

import java.util.HashSet;

import java.util.List;

import java.util.Map;

import java.util.Optional;

import java.util.Set;

import java.util.stream.Collectors;

import java.util.stream.IntStream;

import org.eclipse.lsp4j.CompletionItem;

import org.eclipse.lsp4j.CompletionItemKind;

import org.eclipse.lsp4j.Diagnostic;

import org.eclipse.lsp4j.DiagnosticSeverity;

import org.eclipse.lsp4j.InsertTextFormat;

import org.eclipse.lsp4j.Location;

import org.eclipse.lsp4j.jsonrpc.CompletableFutures;

import org.eclipse.lsp4j.Position;

import org.eclipse.lsp4j.PublishDiagnosticsParams;

import org.eclipse.lsp4j.Range;

import org.eclipse.lsp4j.services.LanguageClient;

import org.eclipse.lsp4j.TextEdit;

import org.jsoup.Jsoup;

import processing.app.Base;

import processing.app.contrib.ModeContribution;

import processing.app.Platform;

import processing.app.Preferences;

import processing.app.Problem;

import processing.app.Sketch;

import processing.app.SketchCode;

import processing.mode.java.AutoFormat;

import processing.mode.java.CompletionCandidate;

import processing.mode.java.CompletionGenerator;

import processing.mode.java.ErrorChecker;

import processing.mode.java.JavaMode;

import processing.mode.java.JavaTextArea;

import processing.mode.java.PreprocService;

import processing.mode.java.PreprocSketch;

import static java.util.Arrays.copyOfRange;

class PdeAdapter {

File rootPath;

LanguageClient client;

JavaMode javaMode;

File pdeFile;

Sketch sketch;

CompletionGenerator completionGenerator;

PreprocService preprocService;

ErrorChecker errorChecker;

CompletableFuture<PreprocSketch> cps;

CompletionGenerator suggestionGenerator;

Set<URI> prevDiagnosticReportUris = new HashSet<>();

PreprocSketch ps;

PdeAdapter(File rootPath, LanguageClient client) {

this.rootPath = rootPath;

this.client = client;

File location = Platform.getContentFile("modes/java");

ModeContribution mc =

ModeContribution.load(null, location, JavaMode.class.getName());

if (mc == null) {

// Shouldn't be possible but IntelliJ is complaining about it,

// and we may run into path issues when running externally [fry 221126]

throw new RuntimeException("Could not load Java Mode from " + location);

}

javaMode = (JavaMode) mc.getMode();

pdeFile = new File(rootPath, rootPath.getName() + ".pde");

sketch = new Sketch(pdeFile.toString(), javaMode);

completionGenerator = new CompletionGenerator(javaMode);

preprocService = new PreprocService(javaMode, sketch);

errorChecker = new ErrorChecker(this::updateProblems, preprocService);

cps = CompletableFutures.computeAsync(_x -> {

throw new RuntimeException("unreachable");

});

suggestionGenerator = new CompletionGenerator(javaMode);

notifySketchChanged();

}

static Optional<File> uriToPath(URI uri) {

try {

return Optional.of(new File(uri));

} catch (Exception e) {

return Optional.empty();

}

static URI pathToUri(File path) {

return path.toURI();

}

static Offset toLineCol(String s, int offset) {

int line = (int)s.substring(0, offset).chars().filter(c -> c == '\n').count();

int col = offset - s.substring(0, offset).lastIndexOf('\n');

return new Offset(line, col);

}

static Offset toLineEndCol(String s, int offset) {

Offset before = toLineCol(s, offset);

return new Offset(before.line, Integer.MAX_VALUE);

}

/**

* Converts a tabOffset to a position within a tab

* @param program current code(text) from a tab

* @param tabOffset character offset inside a tab

* @return Position(line and col) within the tab

static Position toPosition(String program, int tabOffset){

Offset offset = toLineCol(program, tabOffset);

return new Position(offset.line, offset.col-1);

}

/**

* Converts a range (start to end offset) to a location.

* @param program current code(text) from a tab

* @param startTabOffset starting character offset inside a tab

* @param stopTabOffset ending character offset inside a tab

* @param uri uri from a tab

* @return Range inside a file

static Location toLocation(

String program,

int startTabOffset,

int stopTabOffset,

URI uri

){

Position startPos = toPosition(program, startTabOffset);

Position stopPos = toPosition(program, stopTabOffset);

Range range = new Range(startPos, stopPos);

return new Location(uri.toString(), range);

}

static void init() {

Base.setCommandLine();

Platform.init();

Preferences.init();

}

void notifySketchChanged() {

CompletableFuture<PreprocSketch> cps = new CompletableFuture<>();

this.cps = cps;

preprocService.notifySketchChanged();

errorChecker.notifySketchChanged();

preprocService.whenDone(cps::complete);

try { ps = cps.get();

} catch (InterruptedException | ExecutionException e) {

throw new RuntimeException(e);

}

Optional<SketchCode> findCodeByUri(URI uri) {

return PdeAdapter.uriToPath(uri)

.flatMap(path -> Arrays.stream(sketch.getCode())

.filter(code -> code.getFile().equals(path))

.findFirst()

);

}

/**

* Looks for the tab number for a given text

* @param code text(code) from a tab

* @return tabIndex where the code belongs to, or empty

public Optional<Integer> findTabIndex(SketchCode code){

int tabsCount = sketch.getCodeCount();

java.util.OptionalInt optionalTabIndex;

optionalTabIndex = IntStream.range(0, tabsCount)

.filter(i -> sketch.getCode(i).equals(code))

.findFirst();

if(optionalTabIndex.isEmpty()){

return Optional.empty();

}

return Optional.of(optionalTabIndex.getAsInt());

}

/**

* Looks for the javaOffset, this offset is the character position inside the

* full java file. The position can be used by the AST to find a node.

* @param uri uri of the file(tab) where to look

* @param line line number

* @param col column number

* @return character offset within the full AST

public Optional<Integer> findJavaOffset(URI uri, int line, int col){

Optional<SketchCode> optionalCode = findCodeByUri(uri);

if(optionalCode.isEmpty()){

System.out.println("couldn't find sketch code");

return Optional.empty();

}

SketchCode code = optionalCode.get();

Optional<Integer> optionalTabIndex = findTabIndex(code);

if (optionalTabIndex.isEmpty()){

System.out.println("couldn't find tab index");

return Optional.empty();

}

int tabIndex = optionalTabIndex.get();

String[] codeLines = copyOfRange(code.getProgram().split("\n"), 0,line);

String codeString = String.join("\n", codeLines);

int tabOffset = codeString.length() + col;

return Optional.of(ps.tabOffsetToJavaOffset(tabIndex, tabOffset));

}

void updateProblems(List<Problem> problems) {

Map<URI, List<Diagnostic>> dias = problems.stream()

.map(prob -> {

SketchCode code = sketch.getCode(prob.getTabIndex());

int startOffset = prob.getStartOffset();

int endOffset = prob.getStopOffset();

Position startPosition = new Position(

prob.getLineNumber(),

PdeAdapter

.toLineCol(code.getProgram(), startOffset)

.col - 1

);

Position stopPosition;

if (endOffset == -1) {

stopPosition = new Position(

prob.getLineNumber(),

PdeAdapter

.toLineEndCol(code.getProgram(), startOffset)

.col - 1

);

} else {

stopPosition = new Position(

prob.getLineNumber(),

PdeAdapter

.toLineCol(code.getProgram(), endOffset)

.col - 1

);

}

Diagnostic dia = new Diagnostic(

new Range(startPosition, stopPosition),

prob.getMessage()

);

dia.setSeverity(

prob.isError()

? DiagnosticSeverity.Error

: DiagnosticSeverity.Warning

);

return new AbstractMap.SimpleEntry<>(

PdeAdapter.pathToUri(code.getFile()),

dia

);

})

.collect(Collectors.groupingBy(

AbstractMap.SimpleEntry::getKey,

Collectors.mapping(

AbstractMap.SimpleEntry::getValue,

Collectors.toList()

)

));

for (Map.Entry<URI, List<Diagnostic>> entry : dias.entrySet()) {

PublishDiagnosticsParams params = new PublishDiagnosticsParams();

params.setUri(entry.getKey().toString());

params.setDiagnostics(entry.getValue());

client.publishDiagnostics(params);

}

for (URI uri : prevDiagnosticReportUris) {

if (!dias.containsKey(uri)) {

PublishDiagnosticsParams params = new PublishDiagnosticsParams();

params.setUri(uri.toString());

params.setDiagnostics(Collections.emptyList());

client.publishDiagnostics(params);

}

prevDiagnosticReportUris = dias.keySet();

}

CompletionItem convertCompletionCandidate(CompletionCandidate c) {

CompletionItem item = new CompletionItem();

item.setLabel(c.getElementName());

item.setInsertTextFormat(InsertTextFormat.Snippet);

String insert = c.getCompletionString();

if (insert.contains("( )")) {

insert = insert.replace("( )", "($1)");

} else if (insert.contains(",")) {

int n = 1;

char[] chs = insert.replace("(,", "($1,").toCharArray();

//insert = "";

StringBuilder newInsert = new StringBuilder();

for (char ch : chs) {

if (ch == ',') {

n += 1;

//insert += ",$" + n;

newInsert.append(",$").append(n);

}

//insert += ch;

newInsert.append(ch);

}

insert = newInsert.toString();

}

item.setInsertText(insert);

CompletionItemKind kind = switch (c.getType()) {

case 0 -> // PREDEF_CLASS

CompletionItemKind.Class;

case 1 -> // PREDEF_FIELD

CompletionItemKind.Constant;

case 2 -> // PREDEF_METHOD

CompletionItemKind.Function;

case 3 -> // LOCAL_CLASS

CompletionItemKind.Class;

case 4 -> // LOCAL_METHOD

CompletionItemKind.Method;

case 5 -> // LOCAL_FIELD

CompletionItemKind.Field;

case 6 -> // LOCAL_VARIABLE

CompletionItemKind.Variable;

default -> throw new IllegalArgumentException("Unknown completion type: " + c.getType());

};

item.setKind(kind);

item.setDetail(Jsoup.parse(c.getLabel()).text());

return item;

}

Optional<String> parsePhrase(String text) {

return Optional.ofNullable(JavaTextArea.parsePhrase(text));

}

List<CompletionCandidate> filterPredictions(

List<CompletionCandidate> candidates

) {

return Collections.list(CompletionGenerator.filterPredictions(candidates).elements());

}

CompletableFuture<List<CompletionItem>> generateCompletion(

URI uri,

int line,

int col

) {

return cps.thenApply(ps -> {

Optional<List<CompletionItem>> result =

findCodeByUri(uri)

.flatMap(code -> {

int codeIndex = IntStream.range(0, sketch.getCodeCount())

.filter(i -> sketch.getCode(i).equals(code))

.findFirst()

.getAsInt();

int lineStartOffset = String.join(

"\n",

Arrays.copyOfRange(code.getProgram().split("\n"), 0, line + 1)

)

.length();

int lineNumber = ps.tabOffsetToJavaLine(codeIndex, lineStartOffset);

String text = code.getProgram()

.split("\n")[line] // TODO: 範囲外のエラー処理

.substring(0, col);

return parsePhrase(text)

.map(phrase -> {

System.out.println("phrase: " + phrase);

System.out.println("lineNumber: " + lineNumber);

return Optional.ofNullable(

suggestionGenerator

.preparePredictions(ps, phrase, lineNumber)

)

.filter(x -> !x.isEmpty())

.map(candidates -> {

Collections.sort(candidates);

System.out.println("candidates: " + candidates);

List<CompletionCandidate> filtered = filterPredictions(candidates);

System.out.println("filtered: " + filtered);

return filtered.stream()

.map(this::convertCompletionCandidate)

.collect(Collectors.toList());

});

})

.orElse(Optional.empty());

});

return result.orElse(Collections.emptyList());

});

}

void onChange(URI uri, String text) {

findCodeByUri(uri)

.ifPresent(code -> {

code.setProgram(text);

notifySketchChanged();

});

}

Optional<TextEdit> format(URI uri) {

return findCodeByUri(uri)

.map(SketchCode::getProgram)

.map(code -> {

String newCode = new AutoFormat().format(code);

Offset end = PdeAdapter.toLineCol(code, code.length());

return new TextEdit(

new Range(

new Position(0, 0),

new Position(end.line, end.col)

newCode

);

});

}

static class Offset {

int line;

int col;

Offset(int line, int col) {

this.line = line;

this.col = col;

}