Implement var statement pre-scanning. (#3103)

The patch also checks whether pre-scanning is successful when scanning is, so no need for explicit pre-scanner checks anymore. JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
2019-09-13 15:36:41 +02:00
parent 6e79bb148e
commit 951d7e6842
18 changed files with 194 additions and 89 deletions
@@ -0,0 +1,73 @@
+/* Copyright JS Foundation and other contributors, http://js.foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef JS_SCANNER_INTERNAL_H
+#define JS_SCANNER_INTERNAL_H
+
+/** \addtogroup parser Parser
+ * @{
+ *
+ * \addtogroup jsparser JavaScript
+ * @{
+ *
+ * \addtogroup jsparser_scanner Scanner
+ * @{
+ */
+
+/**
+ * Generic descriptor which stores only the start position.
+ */
+typedef struct
+{
+  const uint8_t *source_p; /**< start source byte */
+} scanner_source_start_t;
+
+/**
+ * For statement descriptor.
+ */
+typedef struct
+{
+  /** shared fields of for statements */
+  union
+  {
+    const uint8_t *source_p; /**< start source byte */
+    scanner_for_info_t *for_info_p; /**< for info */
+  } u;
+} scanner_for_statement_t;
+
+/**
+ * Switch statement descriptor.
+ */
+typedef struct
+{
+  scanner_case_info_t **last_case_p; /**< last case info */
+} scanner_switch_statement_t;
+
+/**
+ * Scanner context.
+ */
+typedef struct
+{
+  uint8_t mode; /**< scanner mode */
+  scanner_switch_statement_t active_switch_statement; /**< currently active switch statement */
+} scanner_context_t;
+
+/**
+ * @}
+ * @}
+ * @}
+ */
+
+#endif /* !JS_SCANNER_INTERNAL_H */