PyStringLiteralTest.java example

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/*
 * Copyright 2000-2013 JetBrains s.r.o.
 *
 * 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.jetbrains.python;

import com.intellij.openapi.util.Pair;
import com.intellij.openapi.util.TextRange;
import com.intellij.psi.LiteralTextEscaper;
import com.intellij.psi.PsiFile;
import com.intellij.psi.PsiFileFactory;
import com.intellij.psi.PsiLanguageInjectionHost;
import com.intellij.psi.util.PsiTreeUtil;
import com.jetbrains.python.fixtures.PyTestCase;
import com.jetbrains.python.psi.PyStringLiteralExpression;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

/**
 * @author yole
 */
public class PyStringLiteralTest extends PyTestCase {
  public void testEscaperDecode() {
    final PyStringLiteralExpression expr = createLiteralFromText("'\\nfoo'");
    assertNotNull(expr);
    assertEquals("fo", decodeRange(expr, TextRange.create(3, 5)));
    assertEquals("\n", decodeRange(expr, TextRange.create(1, 3)));
  }

  public void testEscaperOffsetInHost() {
    final PyStringLiteralExpression expr = createLiteralFromText("'\\nfoo'");
    assertNotNull(expr);
    final LiteralTextEscaper<? extends PsiLanguageInjectionHost> escaper = expr.createLiteralTextEscaper();
    final TextRange newLineFoo = TextRange.create(1, 6);
    assertEquals(1, escaper.getOffsetInHost(0, newLineFoo));
    assertEquals(3, escaper.getOffsetInHost(1, newLineFoo));
    assertEquals(4, escaper.getOffsetInHost(2, newLineFoo));
    assertEquals(5, escaper.getOffsetInHost(3, newLineFoo));
    assertEquals(6, escaper.getOffsetInHost(4, newLineFoo));
    assertEquals(-1, escaper.getOffsetInHost(5, newLineFoo));
  }

  public void testEscaperOffsetInHostSubString() {
    final PyStringLiteralExpression expr = createLiteralFromText("'\\nfoo'");
    assertNotNull(expr);
    final LiteralTextEscaper<? extends PsiLanguageInjectionHost> escaper = expr.createLiteralTextEscaper();
    final TextRange fooOnly = TextRange.create(3, 6);
    assertEquals(3, escaper.getOffsetInHost(0, fooOnly));
    assertEquals(4, escaper.getOffsetInHost(1, fooOnly));
    assertEquals(5, escaper.getOffsetInHost(2, fooOnly));
    assertEquals(6, escaper.getOffsetInHost(3, fooOnly));
    assertEquals(-1, escaper.getOffsetInHost(4, fooOnly));
  }

  public void testEscaperOffsetInSingleCharString() {
    final PyStringLiteralExpression expr = createLiteralFromText("'c'");
    assertNotNull(expr);
    final LiteralTextEscaper<? extends PsiLanguageInjectionHost> escaper = expr.createLiteralTextEscaper();
    final TextRange range = TextRange.create(1, 2);
    assertEquals(1, escaper.getOffsetInHost(0, range));
    assertEquals(2, escaper.getOffsetInHost(1, range));
    assertEquals(-1, escaper.getOffsetInHost(2, range));
  }

  public void testEscaperOffsetInSingleEscapedCharString() {
    final PyStringLiteralExpression expr = createLiteralFromText("'\\n'");
    assertNotNull(expr);
    final LiteralTextEscaper<? extends PsiLanguageInjectionHost> escaper = expr.createLiteralTextEscaper();
    final TextRange range = TextRange.create(1, 3);
    assertEquals(1, escaper.getOffsetInHost(0, range));
    assertEquals(3, escaper.getOffsetInHost(1, range));
    assertEquals(-1, escaper.getOffsetInHost(2, range));
  }

  public void testIterateCharacterRanges() {
    assertSameElements(getCharacterRanges("'\\nfoo'  'bar'"),
                       Arrays.asList("\n", "foo", "bar"));
  }

  public void testIterateEscapedBackslash() {
    assertSameElements(getCharacterRanges("'''\n" +
                                          "foo.\\\\\n" +
                                          "bar\n" +
                                          "'''\n"),
                       Arrays.asList("\nfoo.", "\\", "\nbar\n"));
  }

  public void testEscaperOffsetInEscapedBackslash() {
    final PyStringLiteralExpression expr = createLiteralFromText("'XXX foo.\\\\bar YYY'");
    assertNotNull(expr);
    final LiteralTextEscaper<? extends PsiLanguageInjectionHost> escaper = expr.createLiteralTextEscaper();
    final TextRange range = TextRange.create(5, 14);
    assertEquals(5, escaper.getOffsetInHost(0, range));
    assertEquals(6, escaper.getOffsetInHost(1, range));
    assertEquals(7, escaper.getOffsetInHost(2, range));
    assertEquals(8, escaper.getOffsetInHost(3, range));
    assertEquals(9, escaper.getOffsetInHost(4, range));
    assertEquals(11, escaper.getOffsetInHost(5, range));
    assertEquals(12, escaper.getOffsetInHost(6, range));
    assertEquals(13, escaper.getOffsetInHost(7, range));
    assertEquals(14, escaper.getOffsetInHost(8, range));
    assertEquals(-1, escaper.getOffsetInHost(9, range));
  }

  public void testEscaperOffsetInLongUnicodeEscape() {
    final PyStringLiteralExpression expr = createLiteralFromText("u'XXX a\\U0001F600\\U0001F600b YYY'");
    final LiteralTextEscaper<? extends PsiLanguageInjectionHost> escaper = expr.createLiteralTextEscaper();
    final TextRange range = TextRange.create(6, 28);
    assertEquals(6, escaper.getOffsetInHost(0, range));
    assertEquals(7, escaper.getOffsetInHost(1, range));
    // Each \\U0001F600 is represented as a surrogate pair, hence 2 characters-wide step in decoded text
    assertEquals(17, escaper.getOffsetInHost(3, range)); 
    assertEquals(27, escaper.getOffsetInHost(5, range));
    assertEquals(28, escaper.getOffsetInHost(6, range));
    assertEquals(-1, escaper.getOffsetInHost(7, range));
  }

  public void testStringValue() {
    assertEquals("foo", createLiteralFromText("\"\"\"foo\"\"\"").getStringValue());
    assertEquals("foo", createLiteralFromText("u\"foo\"").getStringValue());
    assertEquals("foo", createLiteralFromText("b\"foo\"").getStringValue());
    assertEquals("\\b", createLiteralFromText("r'\\b'").getStringValue());
    assertEquals("b\\n", createLiteralFromText("ur'\\u0062\\n'").getStringValue());
    assertEquals("\\8", createLiteralFromText("'\\8'").getStringValue());
  }

  public void testEscapedUnicodeInLiterals() {
    assertEquals("\\u0041", createLiteralFromText("'\\u0041'").getStringValue());
    assertEquals("A", createLiteralFromText("u'\\u0041'").getStringValue());
    assertEquals("\\u0041", createLiteralFromText("b'\\u0041'").getStringValue());
  }

  public void testNonUnicodeCodePointValue() {
    assertEquals("\\U12345678", createLiteralFromText("u'\\U12345678'").getStringValue());
  }

  private static String decodeRange(PyStringLiteralExpression expr, TextRange range) {
    final StringBuilder builder = new StringBuilder();
    expr.createLiteralTextEscaper().decode(range, builder);
    return builder.toString();
  }

  private PyStringLiteralExpression createLiteralFromText(final String text) {
    final PsiFile file = PsiFileFactory.getInstance(myFixture.getProject()).createFileFromText("test.py", "a = " + text);
    final PyStringLiteralExpression expr = PsiTreeUtil.getParentOfType(file.findElementAt(5), PyStringLiteralExpression.class);
    assert expr != null;
    return expr;
  }

  private List<String> getCharacterRanges(String text) {
    final PyStringLiteralExpression expr = createLiteralFromText(text);
    assertNotNull(expr);
    final List<String> characters = new ArrayList<>();
    for (Pair<TextRange, String> fragment : expr.getDecodedFragments()) {
      characters.add(fragment.getSecond());
    }
    return characters;
  }
}