Rename strange-sounding "group syntax" to "operator syntax".

Author: DougGregor

Sources/SwiftOperatorPrecedence/OperatorPrecedence+Folding.swift

@@ -176,9 +176,9 @@ extension OperatorPrecedence {
   /// Determine the associativity between two precedence groups.
   private func associativity(
     firstGroup: PrecedenceGroupName?,
-    firstGroupSyntax: Syntax?,
+    firstOperatorSyntax: Syntax?,
     secondGroup: PrecedenceGroupName?,
-    secondGroupSyntax: Syntax?,
+    secondOperatorSyntax: Syntax?,
     errorHandler: OperatorPrecedenceErrorHandler = { throw $0 }
   ) rethrows -> Associativity {
     guard let firstGroup = firstGroup, let secondGroup = secondGroup else {
@@ -189,7 +189,7 @@ extension OperatorPrecedence {
     if firstGroup == secondGroup {
       guard let group = precedenceGraph.lookupGroup(firstGroup) else {
         try errorHandler(
-          .missingGroup(firstGroup, referencedFrom: firstGroupSyntax))
+          .missingGroup(firstGroup, referencedFrom: firstOperatorSyntax))
         return .none
       }
 
@@ -198,7 +198,7 @@ extension OperatorPrecedence {
 
     let prec = try precedenceGraph.precedence(
       relating: firstGroup, to: secondGroup,
-      startSyntax: firstGroupSyntax, endSyntax: secondGroupSyntax,
+      startSyntax: firstOperatorSyntax, endSyntax: secondOperatorSyntax,
       errorHandler: errorHandler
     )
 
@@ -288,9 +288,9 @@ extension OperatorPrecedence {
 
       let associativity = try associativity(
         firstGroup: op1Precedence,
-        firstGroupSyntax: Syntax(op1),
+        firstOperatorSyntax: Syntax(op1),
         secondGroup: op2Precedence,
-        secondGroupSyntax: Syntax(op2),
+        secondOperatorSyntax: Syntax(op2),
         errorHandler: errorHandler
       )
 

Sources/SwiftOperatorPrecedence/OperatorPrecedence+Semantics.swift

@@ -73,9 +73,9 @@ extension Operator {
 
     name = syntax.identifier.text
 
-    if let groupSyntax = syntax.operatorPrecedenceAndTypes?
+    if let operatorSyntax = syntax.operatorPrecedenceAndTypes?
         .precedenceGroupAndDesignatedTypes {
-      precedenceGroup = groupSyntax.firstToken?.text
+      precedenceGroup = operatorSyntax.firstToken?.text
     } else {
       precedenceGroup = nil
     }

Sources/SwiftOperatorPrecedence/PrecedenceGraph.swift

@@ -72,10 +72,10 @@ struct PrecedenceGraph {
 
     var stack: [(PrecedenceGroupName, Syntax?)] =
       [(initialGroupName, initialSyntax)]
-    while let (currentGroupName, currentGroupSyntax) = stack.popLast() {
+    while let (currentGroupName, currentOperatorSyntax) = stack.popLast() {
       guard let currentGroup = lookupGroup(currentGroupName) else {
         try errorHandler(
-          .missingGroup(currentGroupName, referencedFrom: currentGroupSyntax))
+          .missingGroup(currentGroupName, referencedFrom: currentOperatorSyntax))
         continue
       }