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2. Parsing Test

The first test will check if the parser, implemented in the Lexer and Parser Definition section of the Custom Language Support Tutorial works as we expect it.

2.1. Define input test data

Create a file ParsingTestData.simple in testData folder.

# You are reading the ".properties" entry.
! The exclamation mark can also mark text as comments.
website = http://en.wikipedia.org/

language = English
# The backslash below tells the application to continue reading
# the value onto the next line.
message = Welcome to \
          Wikipedia!
# Add spaces to the key
key\ with\ spaces = This is the value that could be looked up with the key "key with spaces".
# Unicode
tab : \u0009

2.2. Copy the expected PSI tree

The easiest way to get the expected PSI structure for any file is to use PSI Viewer. Run the project and call Tools → View PSI Structure.

PSI Tree Copy

Use Copy PSI button to copy the expected PSI structure to the clipboard.

2.3. Define an output test data

Create a file ParsingTestData.txt with the copied PSI tree.

Simple File(0,433)
  PsiComment(SimpleTokenType.COMMENT)('# You are reading the ".properties" entry.')(0,42)
  PsiElement(SimpleTokenType.CRLF)('\n')(42,43)
  PsiComment(SimpleTokenType.COMMENT)('! The exclamation mark can also mark text as comments.')(43,97)
  PsiElement(SimpleTokenType.CRLF)('\n')(97,98)
  SimplePropertyImpl(PROPERTY)(98,132)
    PsiElement(SimpleTokenType.KEY)('website')(98,105)
    PsiWhiteSpace(' ')(105,106)
    PsiElement(SimpleTokenType.SEPARATOR)('=')(106,107)
    PsiWhiteSpace(' ')(107,108)
    PsiElement(SimpleTokenType.VALUE)('http://en.wikipedia.org/')(108,132)
  PsiElement(SimpleTokenType.CRLF)('\n')(132,133)
  PsiElement(SimpleTokenType.CRLF)('\n')(133,134)
  SimplePropertyImpl(PROPERTY)(134,152)
    PsiElement(SimpleTokenType.KEY)('language')(134,142)
    PsiWhiteSpace(' ')(142,143)
    PsiElement(SimpleTokenType.SEPARATOR)('=')(143,144)
    PsiWhiteSpace(' ')(144,145)
    PsiElement(SimpleTokenType.VALUE)('English')(145,152)
  PsiElement(SimpleTokenType.CRLF)('\n')(152,153)
  PsiComment(SimpleTokenType.COMMENT)('# The backslash below tells the application to continue reading')(153,216)
  PsiElement(SimpleTokenType.CRLF)('\n')(216,217)
  PsiComment(SimpleTokenType.COMMENT)('# the value onto the next line.')(217,248)
  PsiElement(SimpleTokenType.CRLF)('\n')(248,249)
  SimplePropertyImpl(PROPERTY)(249,292)
    PsiElement(SimpleTokenType.KEY)('message')(249,256)
    PsiWhiteSpace(' ')(256,257)
    PsiElement(SimpleTokenType.SEPARATOR)('=')(257,258)
    PsiWhiteSpace(' ')(258,259)
    PsiElement(SimpleTokenType.VALUE)('Welcome to \\n          Wikipedia!')(259,292)
  PsiElement(SimpleTokenType.CRLF)('\n')(292,293)
  PsiComment(SimpleTokenType.COMMENT)('# Add spaces to the key')(293,316)
  PsiElement(SimpleTokenType.CRLF)('\n')(316,317)
  SimplePropertyImpl(PROPERTY)(317,410)
    PsiElement(SimpleTokenType.KEY)('key\ with\ spaces')(317,334)
    PsiWhiteSpace(' ')(334,335)
    PsiElement(SimpleTokenType.SEPARATOR)('=')(335,336)
    PsiWhiteSpace(' ')(336,337)
    PsiElement(SimpleTokenType.VALUE)('This is the value that could be looked up with the key "key with spaces".')(337,410)
  PsiElement(SimpleTokenType.CRLF)('\n')(410,411)
  PsiComment(SimpleTokenType.COMMENT)('# Unicode')(411,420)
  PsiElement(SimpleTokenType.CRLF)('\n')(420,421)
  SimplePropertyImpl(PROPERTY)(421,433)
    PsiElement(SimpleTokenType.KEY)('tab')(421,424)
    PsiWhiteSpace(' ')(424,425)
    PsiElement(SimpleTokenType.SEPARATOR)(':')(425,426)
    PsiWhiteSpace(' ')(426,427)
    PsiElement(SimpleTokenType.VALUE)('\u0009')(427,433)

2.4. Define a parsing test

{% include /code_samples/simple_language_plugin/tests/com/simpleplugin/SimpleParsingTest.java %}

2.5. Run the test

Run the test and make sure it's green.

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