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grammar_and_parser.md: minor

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topics/tutorials/custom_language_support/grammar_and_parser.md
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[//]: # (title: 3. Grammar and Parser)
<!-- Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
<!-- Copyright 2000-2021 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
In order for the IntelliJ Platform to parse a Simple Language file, tokens and elements must be defined based on [`IElementType`](upsource:///platform/core-api/src/com/intellij/psi/tree/IElementType.java).
The Simple Language grammar must also be defined to generate a parser.
@ -47,7 +47,7 @@ private item_ ::= (property|COMMENT|CRLF)
property ::= (KEY? SEPARATOR VALUE?) | KEY
```
As shown, a properties file can contain properties, comments, and line breaks.
As shown, a Simple Language file can contain properties, comments, and line breaks.
Please see [Grammar Kit](https://github.com/JetBrains/Grammar-Kit) documentation for more details on BNF syntax.
@ -55,7 +55,7 @@ The grammar defines the flexibility of the support for a language.
The above grammar specifies that a property may have or may not have key and value.
This flexibility allows the IntelliJ Platform to recognize incorrectly defined properties and provide corresponding code analysis and quick-fixes.
Note that the `SimpleTypes` class in the `elementTypeHolderClass` field above specifies the name of a class that gets generated from the grammar; it doesn't exist at this point.
Note that the `SimpleTypes` class in the `elementTypeHolderClass` attribute above specifies the name of a class that gets generated from the grammar; it doesn't exist at this point.
## Generate a Parser
Now that the grammar is defined generate a parser with PSI classes via **Generate Parser Code** from the context menu on the *Simple.bnf* file.