[libSyntax] Store range in token_data in C lib parse actions

We don't actually need the range for layout nodes, so just store it
for token nodes. This will also make deferred node handling easier
later on, because we don't need to keep track of layout node ranges.

Author: ahoppen

Diff for: include/swift-c/SyntaxParser/SwiftSyntaxParser.h

@@ -103,6 +103,8 @@ typedef struct {
   uint16_t leading_trivia_count;
   uint16_t trailing_trivia_count;
   swiftparse_token_kind_t kind;
+  /// Represents the range for the node, including trivia.
+  swiftparse_range_t range;
 } swiftparse_token_data_t;
 
 typedef struct {
@@ -115,9 +117,6 @@ typedef struct {
     swiftparse_token_data_t token_data;
     swiftparse_layout_data_t layout_data;
   };
-  /// Represents the range for the node. For a token node the range includes
-  /// the trivia associated with it.
-  swiftparse_range_t range;
   /// The syntax kind. A value of '0' means this is a token node.
   swiftparse_syntax_kind_t kind;
   bool present;

Diff for: tools/libSwiftSyntaxParser/libSwiftSyntaxParser.cpp

@@ -150,7 +150,7 @@ class CLibParseActions : public SyntaxParseActions {
     node.token_data.trailing_trivia_count = trailingTrivia.size();
     assert(node.token_data.trailing_trivia_count == trailingTrivia.size() &&
            "trailing trivia count value is too large");
-    makeCRange(node.range, range);
+    makeCRange(node.token_data.range, range);
     node.present = true;
   }
 
@@ -186,7 +186,6 @@ class CLibParseActions : public SyntaxParseActions {
     node.layout_data.nodes =
         const_cast<const swiftparse_client_node_t *>(elements.data());
     node.layout_data.nodes_count = elements.size();
-    makeCRange(node.range, range);
     node.present = true;
     return getNodeHandler()(&node);
   }

Diff for: tools/swift-syntax-parser-test/swift-syntax-parser-test.cpp

@@ -58,7 +58,6 @@ NumParses("n", cl::desc("number of invocations"), cl::init(1));
 namespace {
 struct SPNode {
   swiftparse_syntax_kind_t kind;
-  StringRef nodeText;
 
   Optional<swiftparse_token_kind_t> tokKind;
   StringRef leadingTriviaText;
@@ -111,21 +110,20 @@ static swiftparse_client_node_t
 makeNode(const swiftparse_syntax_node_t *raw_node, StringRef source) {
   SPNode *node = new SPNode();
   node->kind = raw_node->kind;
-  auto range = raw_node->range;
-  node->nodeText = source.substr(range.offset, range.length);
   if (raw_node->kind == 0) {
+    auto range = raw_node->token_data.range;
+    auto nodeText = source.substr(range.offset, range.length);
     node->tokKind = raw_node->token_data.kind;
     size_t leadingTriviaLen =
       trivialLen(makeArrayRef(raw_node->token_data.leading_trivia,
                               raw_node->token_data.leading_trivia_count));
     size_t trailingTriviaLen =
       trivialLen(makeArrayRef(raw_node->token_data.trailing_trivia,
                               raw_node->token_data.trailing_trivia_count));
-    node->leadingTriviaText = node->nodeText.take_front(leadingTriviaLen);
-    node->tokenText =
-      node->nodeText.substr(leadingTriviaLen,
-                            range.length-leadingTriviaLen-trailingTriviaLen);
-    node->trailingTriviaText = node->nodeText.take_back(trailingTriviaLen);
+    node->leadingTriviaText = nodeText.take_front(leadingTriviaLen);
+    node->tokenText = nodeText.substr(
+        leadingTriviaLen, range.length - leadingTriviaLen - trailingTriviaLen);
+    node->trailingTriviaText = nodeText.take_back(trailingTriviaLen);
   } else {
     for (unsigned i = 0, e = raw_node->layout_data.nodes_count; i != e; ++i) {
       auto subnode = convertClientNode(raw_node->layout_data.nodes[i]);