com.google.auto.value.processor.Reformatter Maven / Gradle / Ivy
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Immutable value-type code generation for Java 1.6+.
/*
* Copyright 2014 Google LLC
*
* 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.google.auto.value.processor;
/**
* Postprocessor that runs over the output of the template engine in order to make it look nicer.
* Mostly, this involves removing surplus horizontal and vertical space.
*
* @author [email protected] (Éamonn McManus)
*/
class Reformatter {
static String fixup(String s) {
StringBuilder out = new StringBuilder();
JavaScanner scanner = new JavaScanner(s);
s = scanner.string();
int len = s.length();
for (int start = 0, previous = 0, braces = 0, parens = 0, end = 0;
start < len;
previous = start, start = end) {
end = scanner.tokenEnd(start);
// The tokenized string always ends with \n so we can usually look at s.charAt(end) without
// worrying about going past the end of the string.
switch (s.charAt(start)) {
case '(':
parens++;
break;
case ')':
parens--;
break;
case '{':
braces++;
break;
case '}':
braces--;
break;
case ' ':
// This token is a string of consecutive spaces that is not at the start of a line.
// Consecutive spaces at the start of a line are attached to the previous newline, and
// we don't expect the first line to start with spaces. So we are going to compress this
// into just one space, and we are going to delete it entirely if it follows '(' or
// precedes a newline or one of the punctuation characters here.
if (s.charAt(previous) != '(' && "\n.,;)".indexOf(s.charAt(end)) < 0) {
out.append(' ');
}
continue;
case '\n':
// This token is a newline plus any following spaces (the indentation of the next line).
// If it is followed by something other than a newline then we will output it. Otherwise,
// it is part of a sequence of newlines but it is not the last one. If this is a context
// where we delete blank lines, or if this is not the first new line in the sequence, or
// if we are at the start of the file, we will delete this one. Otherwise we will output a
// single newline with no following indentation. Contexts where we delete blank lines are
// inside parentheses or inside more than one set of braces.
if (end < len && s.charAt(end) != '\n') {
if (out.length() == 0) {
// Omit newlines at the very start of the file.
start++;
}
break; // Output the newline and its following indentation.
}
if (parens == 0 && braces < 2 && s.charAt(previous) != '\n' && out.length() > 0) {
out.append('\n');
}
continue;
default:
break;
}
out.append(s, start, end);
}
return out.toString();
}
}
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