Fix import path grammar and grammar testing details.

docs/grammar.rst

@@ -2,12 +2,12 @@
 Language Grammar
 ****************
 
-.. a4:autogrammar:: Solidity
-   :only-reachable-from: Solidity.sourceUnit
+.. a4:autogrammar:: SolidityParser
+   :only-reachable-from: SolidityParser.sourceUnit
    :undocumented:
    :cc-to-dash:
 
 .. a4:autogrammar:: SolidityLexer
-   :only-reachable-from: Solidity.sourceUnit
+   :only-reachable-from: SolidityParser.sourceUnit
    :fragments:
    :cc-to-dash:

docs/grammar/SolidityLexer.g4

@@ -155,15 +155,20 @@ Not: '!';
 BitNot: '~';
 Inc: '++';
 Dec: '--';
+//@doc:inline
+DoubleQuote: '"';
+//@doc:inline
+SingleQuote: '\'';
 
 /**
- * A single quoted string literal restricted to printable characters.
- */
-StringLiteral: '"' DoubleQuotedStringCharacter* '"' | '\'' SingleQuotedStringCharacter* '\'';
-/**
- * A single non-empty quoted string literal.
+ * A non-empty quoted string literal restricted to printable characters.
  */
 NonEmptyStringLiteral: '"' DoubleQuotedStringCharacter+ '"' | '\'' SingleQuotedStringCharacter+ '\'';
+/**
+ * An empty string literal
+ */
+EmptyStringLiteral: '"' '"' | '\'' '\'';
+
 // Note that this will also be used for Yul string literals.
 //@doc:inline
 fragment DoubleQuotedStringCharacter: DoubleQuotedPrintable | EscapeSequence;
@@ -200,6 +205,7 @@ fragment DoubleQuotedUnicodeStringCharacter: ~["\r\n\\] | EscapeSequence;
 //@doc:inline
 fragment SingleQuotedUnicodeStringCharacter: ~['\r\n\\] | EscapeSequence;
 
+// Note that this will also be used for Yul hex string literals.
 /**
  * Hex strings need to consist of an even number of hex digits that may be grouped using underscores.
  */
@@ -315,6 +321,7 @@ YulDecimalNumber: '0' | ([1-9] [0-9]*);
 YulStringLiteral:
 	'"' DoubleQuotedStringCharacter* '"'
 	| '\'' SingleQuotedStringCharacter* '\'';
+//@doc:inline
 YulHexStringLiteral: HexString;
 
 YulWS: [ \t\r\n\u000C]+ -> skip ;

docs/grammar/SolidityParser.g4

@@ -1,7 +1,7 @@
 /**
  * Solidity is a statically typed, contract-oriented, high-level language for implementing smart contracts on the Ethereum platform.
  */
-grammar Solidity;
+parser grammar SolidityParser;
 
 options { tokenVocab=SolidityLexer; }
 
@@ -388,7 +388,7 @@ booleanLiteral: True | False;
 /**
  * A full string literal consists of either one or several consecutive quoted strings.
  */
-stringLiteral: StringLiteral+;
+stringLiteral: (NonEmptyStringLiteral | EmptyStringLiteral)+;
 /**
  * A full hex string literal that consists of either one or several consecutive hex strings.
  */