Lookahead uses at* notation, Cursor uses isAt* notation.

Author: natikgadzhi

Sources/SwiftParser/Expressions.swift

@@ -874,7 +874,7 @@ extension Parser {
             }
           } while lookahead.at(.poundIf) && lookahead.hasProgressed(&loopProgress)
 
-          guard lookahead.isAtStartOfPostfixExprSuffix() else {
+          guard lookahead.atStartOfPostfixExprSuffix() else {
             break
           }
         }
@@ -2487,7 +2487,7 @@ extension Parser.Lookahead {
 extension Parser.Lookahead {
   // Helper function to see if we can parse member reference like suffixes
   // inside '#if'.
-  fileprivate mutating func isAtStartOfPostfixExprSuffix() -> Bool {
+  fileprivate mutating func atStartOfPostfixExprSuffix() -> Bool {
     guard self.at(.period) else {
       return false
     }

Sources/SwiftParser/Lexer/Cursor.swift

@@ -1856,7 +1856,7 @@ extension Lexer.Cursor {
 
   /// Returns `true` if the cursor is positioned at `\##(` with `delimiterLength`
   /// pound characters.
-  private func atStringInterpolationAnchor(delimiterLength: Int) -> Bool {
+  private func isAtStringInterpolationAnchor(delimiterLength: Int) -> Bool {
     guard self.is(at: "\\") else {
       return false
     }
@@ -1868,7 +1868,7 @@ extension Lexer.Cursor {
 
   /// Returns `true` if we are positioned at a backslash that escapes the newline
   /// character in a multi-line string literal.
-  private func atEscapedNewline(delimiterLength: Int) -> Bool {
+  private func isAtEscapedNewline(delimiterLength: Int) -> Bool {
     guard self.is(at: "\\") else {
       return false
     }
@@ -1891,13 +1891,13 @@ extension Lexer.Cursor {
     while true {
       switch self.peek() {
       case UInt8(ascii: "\\"):
-        if self.atStringInterpolationAnchor(delimiterLength: delimiterLength) {
+        if self.isAtStringInterpolationAnchor(delimiterLength: delimiterLength) {
           return Lexer.Result(
             .stringSegment,
             error: error,
             stateTransition: .push(newState: .inStringInterpolationStart(stringLiteralKind: stringLiteralKind))
           )
-        } else if stringLiteralKind == .multiLine && self.atEscapedNewline(delimiterLength: delimiterLength) {
+        } else if stringLiteralKind == .multiLine && self.isAtEscapedNewline(delimiterLength: delimiterLength) {
           return Lexer.Result(
             .stringSegment,
             trailingTriviaLexingMode: .escapedNewlineInMultiLineStringLiteral