com.shapesecurity.shift.codegen.TokenStream Maven / Gradle / Ivy
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Shift format ECMAScript 6 AST tooling
/*
* Copyright 2014 Shape Security, 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.shapesecurity.shift.codegen;
import com.shapesecurity.shift.utils.D2A;
import com.shapesecurity.shift.utils.Utils;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
class TokenStream {
@NotNull
private final StringBuilder writer;
private char lastChar = (char) -1;
@Nullable
private String lastNumber;
private boolean optionalSemi;
public TokenStream(@NotNull StringBuilder writer) {
this.writer = writer;
}
@NotNull
private static String numberDot(@NotNull String fragment) {
if (fragment.indexOf('.') < 0 && fragment.indexOf('e') < 0) {
return "..";
}
return ".";
}
public void putNumber(double number) {
String tokenStr = D2A.shortD2a(number);
put(tokenStr);
this.lastNumber = tokenStr;
}
public void putOptionalSemi() {
this.optionalSemi = true;
}
@SuppressWarnings("LiteralAsArgToStringEquals")
public void put(@NotNull String tokenStr) {
if (this.optionalSemi) {
this.optionalSemi = false;
if (!tokenStr.equals("}")) {
this.put(";");
}
}
if (this.lastNumber != null && tokenStr.length() == 1) {
if (String.valueOf(tokenStr).equals(".")) {
this.writer.append(numberDot(this.lastNumber));
this.lastNumber = null;
this.lastChar = '.';
return;
}
}
this.lastNumber = null;
char rightChar = tokenStr.charAt(0);
char lastChar = this.lastChar;
this.lastChar = tokenStr.charAt(tokenStr.length() - 1);
if ((lastChar == '+' || lastChar == '-') && lastChar == rightChar ||
Utils.isIdentifierPart(lastChar) && Utils.isIdentifierPart(rightChar) ||
lastChar == '/' && (rightChar == 'i' || rightChar == '/')) {
this.writer.append(' ');
}
if (this.writer.length() >= 2 && tokenStr.equals("--") && this.writer.substring(this.writer.length() - 2,
this.writer.length()).equals("