Package org.apache.groovy.parser.antlr4

Class SemanticPredicates

java.lang.Object
org.apache.groovy.parser.antlr4.SemanticPredicates
public class SemanticPredicates extends Object
Semantic predicates for the lexer and parser.

Lexer helpers on this class run on the tokenisation hot path (GString $, slashy strings, newline-as-separator). They use direct character tests, not regular expressions. Parser helpers such as isIdentifierAssign(TokenStream) are O(1) bitset lookups so AdaptivePredict can skip exploring assignment as an annotation element value (GROOVY-12398).

  • Constructor Details

    • SemanticPredicates

      public SemanticPredicates()

  • Method Details

    • isFollowedByWhiteSpaces

      public static boolean isFollowedByWhiteSpaces(org.antlr.v4.runtime.CharStream cs)
      Check whether the next characters are only white spaces until the end of line or end of file. Matches Java regex \s minus the newlines the loop already stops at: space, tab, VT, FF.

    • isFollowedBy

      public static boolean isFollowedBy(org.antlr.v4.runtime.CharStream cs, char... chars)
      Check whether the next character is one of the specified characters.

    • isFollowedByJavaLetterInGString

      public static boolean isFollowedByJavaLetterInGString(org.antlr.v4.runtime.CharStream cs)
      Check whether the next character is a valid Java identifier part or a left curly brace (for GString expressions).

    • isIdentifierAssign

      public static boolean isIdentifierAssign(org.antlr.v4.runtime.TokenStream ts)
      true when the upcoming tokens are name '=' ..., i.e. a named annotation element-value pair rather than a single element value. Inside annotation parentheses newlines are already hidden, so LT(2) is the token after the name.

    • isFollowingArgumentsOrClosure

      public static boolean isFollowingArgumentsOrClosure(GroovyParser.ExpressionContext context)
      Check whether following a method name of command expression. Method name should not end with "2: arguments" and "3: closure"
      Parameters:
      context - the preceding expression

    • isInvalidMethodDeclaration

      public static boolean isInvalidMethodDeclaration(org.antlr.v4.runtime.TokenStream ts)
      Distinguish between method declaration and method call/constructor declaration

    • isInvalidLocalVariableDeclaration

      public static boolean isInvalidLocalVariableDeclaration(org.antlr.v4.runtime.TokenStream ts)
      Distinguish between local variable declaration and method call, e.g. `a b`