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/*
* Copyright (C) 2015 Square, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.squareup.javawriter.builders;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSortedMap;
import com.squareup.javawriter.ClassName;
import com.squareup.javawriter.StringLiteral;
import com.squareup.javawriter.TypeName;
import com.squareup.javawriter.TypeNames;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
/**
* Converts a {@link JavaFile} to a string suitable to both human- and javac-consumption. This
* honors imports, indentation, and deferred variable names.
*/
class CodeWriter {
private final String indent = " ";
private final StringBuilder out;
private final ImmutableMap<ClassName, String> importedTypes;
private final LinkedHashSet<TypeName> emittedTypes = new LinkedHashSet<>();
private final List<TypeName> visibleTypes = new ArrayList<>();
private int indentLevel;
public CodeWriter(StringBuilder out, ImmutableMap<ClassName, String> importedTypes) {
this.out = checkNotNull(out);
this.importedTypes = checkNotNull(importedTypes);
}
public CodeWriter indent() {
indentLevel++;
return this;
}
public CodeWriter unindent() {
checkState(indentLevel > 0);
indentLevel--;
return this;
}
public CodeWriter pushVisibleType(TypeName typeName) {
visibleTypes.add(typeName);
return this;
}
public CodeWriter popVisibleType(TypeName typeName) {
checkState(visibleTypes.remove(typeName));
return this;
}
public CodeWriter emit(String format, Object... args) {
return emit(new Snippet(format, args));
}
public CodeWriter emit(Snippet snippet) {
int a = 0;
for (String part : snippet.formatParts) {
switch (part) {
case "$L":
emitAndIndent(String.valueOf(snippet.args.get(a++)));
break;
case "$S":
String arg = String.valueOf(snippet.args.get(a++));
emitAndIndent(StringLiteral.forValue(arg).literal());
break;
case "$T":
emitType(snippet.args.get(a++));
break;
case "$$":
emitAndIndent("$");
break;
default:
emitAndIndent(part);
break;
}
}
return this;
}
private void emitType(Object arg) {
TypeName typeName = toTypeName(arg);
emittedTypes.add(typeName);
String shortName = !visibleTypes.contains(typeName)
? importedTypes.get(typeName)
: null;
emitAndIndent(shortName != null ? shortName : typeName.toString());
}
/** Emits {@code s} with indentation as required. */
private void emitAndIndent(String s) {
boolean first = true;
for (String line : s.split("\n", -1)) {
if (!first) out.append('\n');
first = false;
if (line.isEmpty()) continue; // Don't indent empty lines.
emitIndentationIfNecessary();
out.append(line);
}
}
private void emitIndentationIfNecessary() {
// Only emit indentation immediately after a '\n' character.
if (out.length() <= 0 || out.charAt(out.length() - 1) != '\n') return;
for (int j = 0; j < indentLevel; j++) {
out.append(indent);
}
}
private TypeName toTypeName(Object arg) {
if (arg instanceof TypeName) return (TypeName) arg;
if (arg instanceof Class<?>) return TypeNames.forClass((Class<?>) arg);
throw new IllegalArgumentException("Expected type but was " + arg);
}
/**
* Returns the types that should have been imported for this code. If there were any simple name
* collisions, that type's first use is imported.
*/
ImmutableMap<ClassName, String> suggestedImports() {
// Find the simple names that can be imported, and the classes that they target.
Map<String, ClassName> simpleNameToType = new LinkedHashMap<>();
for (TypeName typeName : emittedTypes) {
if (!(typeName instanceof ClassName)) continue;
ClassName className = (ClassName) typeName;
if (simpleNameToType.containsKey(className.simpleName())) continue;
simpleNameToType.put(className.simpleName(), className);
}
// Invert the map.
ImmutableSortedMap.Builder<ClassName, String> typeToSimpleName
= ImmutableSortedMap.naturalOrder();
for (Map.Entry<String, ClassName> entry : simpleNameToType.entrySet()) {
typeToSimpleName.put(entry.getValue(), entry.getKey());
}
// TODO(jwilson): omit imports from java.lang, unless their simple names is also present in the
// current class's package. (Yuck.)
return typeToSimpleName.build();
}
}
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