Add feature to remove parser. (#1476)

Remove the parser so we can save space if we are
only interested in running snapshots.

Removing the parser enables the snapshot execution.

JerryScript-DCO-1.0-Signed-off-by: Sergio Martinez sergio.martinez.rodriguez@intel.com

jerry-core/parser/js/js-parser.c

@@ -19,6 +19,8 @@
 #include "jcontext.h"
 #include "js-parser-internal.h"
 
+#ifndef JERRY_DISABLE_PARSER
+
 /** \addtogroup parser Parser
  * @{
  *
@@ -2228,6 +2230,8 @@ parser_raise_error (parser_context_t *context_p, /**< context */
 #define PARSE_ERR_POS_END         "]"
 #define PARSE_ERR_POS_END_SIZE    ((uint32_t) sizeof (PARSE_ERR_POS_END))
 
+#endif /* !JERRY_DISABLE_PARSER */
+
 /**
  * Parse EcamScript source code
  *
@@ -2243,6 +2247,7 @@ parser_parse_script (const uint8_t *source_p, /**< source code */
                      bool is_strict, /**< strict mode */
                      ecma_compiled_code_t **bytecode_data_p) /**< [out] JS bytecode */
 {
+#ifndef JERRY_DISABLE_PARSER
   parser_error_location_t parser_error;
   *bytecode_data_p = parser_parse_source (source_p, size, is_strict, &parser_error);
 
@@ -2305,8 +2310,15 @@ parser_parse_script (const uint8_t *source_p, /**< source code */
     return ecma_raise_syntax_error ("");
 #endif /* JERRY_ENABLE_ERROR_MESSAGES */
   }
-
   return ecma_make_simple_value (ECMA_SIMPLE_VALUE_TRUE);
+#else /* !JERRY_DISABLE_PARSER */
+  JERRY_UNUSED (source_p);
+  JERRY_UNUSED (size);
+  JERRY_UNUSED (is_strict);
+  JERRY_UNUSED (bytecode_data_p);
+
+  return ecma_raise_syntax_error (ECMA_ERR_MSG ("The parser has been disabled."));
+#endif /* JERRY_DISABLE_PARSER */
 } /* parser_parse_script */
 
 /**