Support Promise<T> syntax in the IDL parser.

The Web IDL spec specifies Promise<T> syntax. This CL makes the IDL parser
recognize the syntax.

BUG=421539

Review URL: https://codereview.chromium.org/653343002

Cr-Commit-Position: refs/heads/master@{#300255}

tools/idl_parser/idl_lexer.py

@@ -94,6 +94,7 @@ class IDLLexer(object):
     'optional' : 'OPTIONAL',
     'or' : 'OR',
     'partial' : 'PARTIAL',
+    'Promise' : 'PROMISE',
     'readonly' : 'READONLY',
     'RegExp' : 'REGEXP',
     'sequence' : 'SEQUENCE',

tools/idl_parser/idl_ppapi_lexer.py

@@ -59,8 +59,8 @@ class IDLPPAPILexer(IDLLexer):
 
     # Remove JS types
     self._DelKeywords(['boolean', 'byte', 'ByteString', 'Date', 'DOMString',
-                       'double', 'float', 'long', 'object', 'octet', 'RegExp',
-                       'short', 'unsigned'])
+                       'double', 'float', 'long', 'object', 'octet', 'Promise',
+                       'RegExp', 'short', 'unsigned'])
 
 
 # If run by itself, attempt to build the lexer

tools/idl_parser/idl_ppapi_parser.py

@@ -124,18 +124,15 @@ class IDLPPAPIParser(IDLParser):
     """StructMember : ExtendedAttributeList Type identifier ';'"""
     p[0] = self.BuildNamed('Member', p, 3, ListFromConcat(p[1], p[2]))
 
-  # [24]
   def p_Typedef(self, p):
     """Typedef : TYPEDEF ExtendedAttributeListNoComments Type identifier ';'"""
     p[0] = self.BuildNamed('Typedef', p, 4, ListFromConcat(p[2], p[3]))
 
-  # [24.1]
   def p_TypedefFunc(self, p):
     """Typedef : TYPEDEF ExtendedAttributeListNoComments ReturnType identifier '(' ArgumentList ')' ';'"""
     args = self.BuildProduction('Arguments', p, 5, p[6])
     p[0] = self.BuildNamed('Callback', p, 4, ListFromConcat(p[2], p[3], args))
 
-  # [27]
   def p_ConstValue(self, p):
     """ConstValue : integer
                   | integer LSHIFT integer
@@ -157,12 +154,10 @@ class IDLPPAPIParser(IDLParser):
                   | BooleanLiteral """
     p[0] = p[1]
 
-  # [21]
   def p_EnumValueList(self, p):
     """EnumValueList : EnumValue EnumValues"""
     p[0] = ListFromConcat(p[1], p[2])
 
-  # [22]
   def p_EnumValues(self, p):
     """EnumValues : ',' EnumValue EnumValues
                   |"""
@@ -176,6 +171,13 @@ class IDLPPAPIParser(IDLParser):
     if len(p) > 3:
       p[0].AddChildren(p[4])
 
+  # Omit PromiseType, as it is a JS type.
+  def p_NonAnyType(self, p):
+    """NonAnyType : PrimitiveType TypeSuffix
+                  | identifier TypeSuffix
+                  | SEQUENCE '<' Type '>' Null"""
+    IDLParser.p_NonAnyType(self, p)
+
   def p_PrimitiveType(self, p):
     """PrimitiveType : IntegerType
                      | UnsignedIntegerType
@@ -200,13 +202,11 @@ class IDLPPAPIParser(IDLParser):
                   | PP_FILEHANDLE"""
     p[0] = p[1]
 
-  # [66]
   def p_FloatType(self, p):
     """FloatType : FLOAT_T
                  | DOUBLE_T"""
     p[0] = p[1]
 
-  # [67]
   def p_UnsignedIntegerType(self, p):
     """UnsignedIntegerType : UINT8_T
                            | UINT16_T
@@ -215,7 +215,6 @@ class IDLPPAPIParser(IDLParser):
     p[0] = p[1]
 
 
-  # [68]
   def p_IntegerType(self, p):
     """IntegerType : CHAR
                    | INT8_T
@@ -237,6 +236,10 @@ class IDLPPAPIParser(IDLParser):
     """ """
     pass
 
+  def p_PromiseType(self, p):
+    """ """
+    pass
+
   # We only support:
   #    [ identifier ]
   #    [ identifier ( ArgumentList )]
@@ -272,7 +275,6 @@ class IDLPPAPIParser(IDLParser):
     if len(p) > 1:
       p[0] = p[1]
 
-  # [76]
   def p_ExtendedAttributeIdentConst(self, p):
     """ExtendedAttributeIdentConst : identifier '=' ConstValue"""
     p[0] = self.BuildNamed('ExtAttribute', p, 1, p[3])

tools/idl_parser/test_parser/interface_web.idl

@@ -181,3 +181,37 @@ interface MyIFaceStringifiers {
 interface MyExtendedAttributeInterface {
   [Attr, MethodIdentList=(Foo, Bar)] void method();
 };
+
+/* TREE
+ *Interface(MyIfacePromise)
+ *  Operation(method1)
+ *    Arguments()
+ *    Type()
+ *      Promise(Promise)
+ *        Type()
+ *          PrimitiveType(void)
+ *  Operation(method2)
+ *    Arguments()
+ *    Type()
+ *      Promise(Promise)
+ *        Type()
+ *          PrimitiveType(long)
+ *  Operation(method3)
+ *    Arguments()
+ *    Type()
+ *      Promise(Promise)
+ *        Type()
+ *          Any()
+ *  Operation(method4)
+ *    Arguments()
+ *    Type()
+ *      Promise(Promise)
+ *        Type()
+ *          Any()
+ */
+interface MyIfacePromise {
+  Promise<void> method1();
+  Promise<long> method2();
+  Promise<any> method3();
+  Promise method4();
+};

tools/idl_parser/test_parser/struct_ppapi.idl

@@ -42,6 +42,9 @@ symatics should exist.  This is an exact match.
  *      ExtAttribute(fake_attribute)
  *    Type()
  *      PrimitiveType(str_t)
+ *  Member(z)
+ *    Type()
+ *      Typeref(Promise)
  *  ExtAttributes()
  *    ExtAttribute(union)
  */
@@ -49,4 +52,5 @@ symatics should exist.  This is an exact match.
   uint32_t x;
   uint64_t y;
   [fake_attribute] str_t string;
+  Promise z;
 };