Revert "Switch to the new SkSL lexer."

This reverts commit c576e93d174f3106e072a2f506bca3990b541265.

Reason for revert: ASAN failures

Original change's description:
> Switch to the new SkSL lexer.
> 
> This completely replaces flex with a new in-house lexical analyzer generator,
> which we have done for performance and memory usage reasons. Flex requires us
> to copy strings every time we need the text of a token, whereas this new lexer
> allows us to handle strings as a (non-null-terminated) pointer and length
> everywhere, eliminating most string copies.
> 
> Bug: skia:
> Change-Id: I2add26efc9e20cb699520e82abcf713af3968aca
> Reviewed-on: https://skia-review.googlesource.com/39780
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Ethan Nicholas <ethannicholas@google.com>

TBR=bsalomon@google.com,ethannicholas@google.com

Change-Id: If27b750a5f696d06a6bcffed12fe9f0598e084a6
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/44881
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/src/sksl/ir/SkSLPrefixExpression.h b/src/sksl/ir/SkSLPrefixExpression.h
index d5d97b2517..5ac84c66b1 100644
--- a/src/sksl/ir/SkSLPrefixExpression.h
+++ b/src/sksl/ir/SkSLPrefixExpression.h
@@ -11,7 +11,7 @@
 #include "SkSLExpression.h"
 #include "SkSLFloatLiteral.h"
 #include "SkSLIRGenerator.h"
-#include "SkSLLexer.h"
+#include "SkSLToken.h"
 
 namespace SkSL {
 
@@ -20,7 +20,7 @@ namespace SkSL {
  */
 struct PrefixExpression : public Expression {
     PrefixExpression(Token::Kind op, std::unique_ptr<Expression> operand)
-    : INHERITED(operand->fOffset, kPrefix_Kind, operand->fType)
+    : INHERITED(operand->fPosition, kPrefix_Kind, operand->fType)
     , fOperand(std::move(operand))
     , fOperator(op) {}
 
@@ -38,7 +38,7 @@ struct PrefixExpression : public Expression {
         if (fOperand->fKind == Expression::kFloatLiteral_Kind) {
             return std::unique_ptr<Expression>(new FloatLiteral(
                                                               irGenerator.fContext,
-                                                              fOffset,
+                                                              Position(),
                                                               -((FloatLiteral&) *fOperand).fValue));
 
         }
@@ -46,7 +46,7 @@ struct PrefixExpression : public Expression {
     }
 
     String description() const override {
-        return Compiler::OperatorName(fOperator) + fOperand->description();
+        return Token::OperatorName(fOperator) + fOperand->description();
     }
 
     std::unique_ptr<Expression> fOperand;