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- More AST'ing about.

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SVN r2359 (scripting)
This commit is contained in:
Randy Heit 2010-06-06 21:04:55 +00:00
parent c043627cc1
commit 85d869315b
2 changed files with 192 additions and 56 deletions
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193
src/zscript/zcc-parse.lemon
View file

@ -1,10 +1,15 @@
%include
{
// Allocates a new AST node off the parse state's arena.
#define NEW_AST_NODE(type,name) \
ZCC_##type *name = (ZCC_##type *)stat->SyntaxArena.Alloc(sizeof(ZCC_##type)); \
name->SiblingNext = name; \
name->SiblingPrev = name; \
name->NodeType = AST_##type
// If a is non-null, appends b to a. Otherwise, sets a to b.
#define SAFE_APPEND(a,b) \
if (a == NULL) a = b; else a->AppendSibling(b);
}
%token_prefix ZCC_
@ -87,23 +92,76 @@ opt_expr(X) ::= expr(A).
}
/* A class definition. Can only occur at global scope. */
class_definition ::= class_start class_body.
/************ Class Definition ************/
/* Can only occur at global scope. */
%type class_definition{ZCC_Class *}
%type class_head{ZCC_Class *}
%type class_innards{ZCC_Class *}
%type class_body{ZCC_TreeNode *}
class_definition(X) ::= class_head(A) class_body(B).
{
/* stat->CurrClass = NULL;*/
A->Body = B;
X = A;
}
class_start ::= CLASS IDENTIFIER class_ancestry class_flags.
class_head(X) ::= CLASS dottable_id(A) class_ancestry(B) class_flags(C).
{
NEW_AST_NODE(Class,head);
head->ClassName = A;
head->ParentName = B;
head->Flags = C.Flags;
head->Replaces = C.Replaces;
X = head;
}
%type class_ancestry {ENamedName}
class_ancestry(X) ::= . { X = NAME_Object; }
class_ancestry(X) ::= COLON IDENTIFIER(A). { X = ENamedName(A.Int); }
%type class_ancestry{ZCC_Identifier *}
class_ancestry(X) ::= . { X = NULL; }
class_ancestry(X) ::= COLON dottable_id(A). { X = A; }
class_flags ::= .
class_flags ::= class_flags ABSTRACT.
class_flags ::= class_flags NATIVE.
class_flags ::= class_flags REPLACES IDENTIFIER.
%type class_flags{ClassFlagsBlock}
%include{
struct ClassFlagsBlock {
VM_UWORD Flags;
ZCC_Identifier *Replaces;
};
}
class_flags(X) ::= . { X.Flags = 0; X.Replaces = NULL; }
class_flags(X) ::= class_flags(A) ABSTRACT. { X.Flags = A.Flags | 0/*FIXME*/; X.Replaces = A.Replaces; }
class_flags(X) ::= class_flags(A) NATIVE. { X.Flags = A.Flags | 0/*FIXME*/; X.Replaces = A.Replaces; }
class_flags(X) ::= class_flags(A) REPLACES dottable_id(B). { X.Flags = A.Flags; X.Replaces = B; }
/*----- Dottable Identifier -----*/
// This can be either a single identifier or two identifiers connected by a .
%type dottable_id{ZCC_Identifier *}
dottable_id(X) ::= IDENTIFIER(A).
{
NEW_AST_NODE(Identifier,id);
id->Id = A.Name();
X = id;
}
dottable_id(X) ::= IDENTIFIER(A) DOT IDENTIFIER(B).
{
NEW_AST_NODE(Identifier,id1);
NEW_AST_NODE(Identifier,id2);
id1->Id = A.Name();
id2->Id = B.Name();
id1->AppendSibling(id2);
X = id1;
}
/*------ Class Body ------*/
// Body is a list of:
// * variable definitions
// * function definitions
// * enum definitions
// * struct definitions
// * state definitions
// * constants
// * defaults
class_body ::= SEMICOLON class_innards EOF.
class_body ::= LBRACE class_innards RBRACE.
@ -111,7 +169,10 @@ class_body ::= LBRACE class_innards RBRACE.
class_innards ::= .
class_innards ::= class_innards class_member.
/* Classes can define variables, functions, enums, structs, states, constants, and defaults. */
%type struct_def{ZCC_Struct *}
%type enum_def {ZCC_Enum *}
%type states_def {ZCC_States *}
class_member ::= declarator.
class_member ::= enum_def.
class_member ::= struct_def.
@ -119,25 +180,79 @@ class_member ::= states_def.
class_member ::= default_def.
class_member ::= const_def.
/* Structs can define variables, enums, and structs. */
struct_def ::= STRUCT IDENTIFIER LBRACE struct_body RBRACE opt_semicolon.
struct_member ::= declarator_no_fun.
struct_member ::= enum_def.
/*----- Struct Definition -----*/
/* Structs can define variables, enums<s>, and structs</s>. */
%type struct_body{ZCC_TreeNode *}
%type struct_member{ZCC_TreeNode *}
struct_def(X) ::= STRUCT IDENTIFIER(A) LBRACE struct_body(B) RBRACE opt_semicolon.
{
NEW_AST_NODE(Struct,def);
def->StructName = A.Name();
def->Body = B;
X = def;
}
struct_body(X) ::= error. { X = NULL; }
struct_body(X) ::= struct_member(A). { X = A; }
struct_body(X) ::= struct_member(A) struct_body(B). { X = A; A->AppendSibling(B); }
struct_member(X) ::= declarator_no_fun(A). { X = A; }
struct_member(X) ::= enum_def(A). { X = A; }
/*----- Enum Definition -----*/
/* Enumerators are lists of named integers. */
enum_def ::= ENUM IDENTIFIER enum_type LBRACE enum_list opt_comma RBRACE opt_semicolon.
enum_type ::= .
enum_type ::= COLON int_type.
%type enum_type {EZCCIntType}
%type enum_list {ZCC_EnumNode *}
%type enumerator {ZCC_EnumNode *}
enum_list ::= enumerator.
enum_list ::= enum_list COMMA enumerator.
enum_def(X) ::= ENUM IDENTIFIER(A) enum_type(B) LBRACE enum_list(C) opt_comma RBRACE opt_semicolon.
{
NEW_AST_NODE(Enum,def);
def->EnumName = A.Name();
def->EnumType = B;
def->Elements = C;
X = def;
}
enumerator ::= IDENTIFIER.
enumerator ::= IDENTIFIER EQ expr. /* Expression must be constant. */
enum_type(X) ::= . { X = ZCCINT_Auto; }
enum_type(X) ::= COLON int_type(A). { X = A; }
/* States */
states_def ::= STATES scanner_mode LBRACE states_body RBRACE.
enum_list(X) ::= error. { X = NULL; }
enum_list(X) ::= enumerator(A). { X = A; }
enum_list(X) ::= enum_list(A) COMMA enumerator(B). { X = A; A->AppendSibling(B); }
enumerator(X) ::= IDENTIFIER(A).
{
NEW_AST_NODE(EnumNode,node);
node->ElemName = A.Name();
node->ElemValue = NULL;
X = node;
}
enumerator(X) ::= IDENTIFIER(A) EQ expr(B). /* Expression must be constant. */
{
NEW_AST_NODE(EnumNode,node);
node->ElemName = A.Name();
node->ElemValue = B;
X = node;
}
/************ States ************/
%type states_body {ZCC_StatePart *}
%type state_line {ZCC_StatePart *}
%type state_label {ZCC_StatePart *}
%type state_flow {ZCC_StatePart *}
states_def(X) ::= STATES scanner_mode LBRACE states_body(A) RBRACE.
{
NEW_AST_NODE(States,def);
def->Body = A;
X = def;
}
/* We use a special scanner mode to allow for sprite names and frame characters
* to not be quoted even if they contain special characters. The scanner_mode
@ -152,12 +267,11 @@ states_def ::= STATES scanner_mode LBRACE states_body RBRACE.
*/
scanner_mode ::= . { stat->sc.SetStateMode(true); }
states_body ::= .
states_body ::= error.
/*states_body ::= states_body LABELID.*/
states_body ::= states_body state_line.
states_body ::= states_body state_label.
states_body ::= states_body state_flow.
states_body(X) ::= . { X = NULL; }
states_body(X) ::= error. { X = NULL; }
states_body(X) ::= states_body(A) state_line(B). { SAFE_APPEND(A,B); X = A; }
states_body(X) ::= states_body(A) state_label(B). { SAFE_APPEND(A,B); X = A; }
states_body(X) ::= states_body(A) state_flow(B). { SAFE_APPEND(A,B); X = A; }
state_label ::= NWS(A) COLON.
{ Printf("Label %s\n", FName(ENamedName(A.Int)).GetChars()); }
@ -201,15 +315,15 @@ dotted_identifier ::= dotted_identifier DOT IDENTIFIER.
default_def ::= DEFAULT compound_statement.
/* Type names */
%type int_type {PType *}
%type int_type {EZCCIntType}
%type type_name {PType *}
int_type(X) ::= SBYTE. { X = TypeSInt8; }
int_type(X) ::= BYTE. { X = TypeUInt8; }
int_type(X) ::= SHORT. { X = TypeSInt16; }
int_type(X) ::= USHORT. { X = TypeUInt16; }
int_type(X) ::= INT. { X = TypeSInt32; }
int_type(X) ::= UINT. { X = TypeUInt32; }
int_type(X) ::= SBYTE. { X = ZCCINT_SInt8; }
int_type(X) ::= BYTE. { X = ZCCINT_UInt8; }
int_type(X) ::= SHORT. { X = ZCCINT_SInt16; }
int_type(X) ::= USHORT. { X = ZCCINT_UInt16; }
int_type(X) ::= INT. { X = ZCCINT_SInt32; }
int_type(X) ::= UINT. { X = ZCCINT_UInt32; }
type_name(X) ::= BOOL. { /*FIXME*/ X = TypeBool; }
type_name(X) ::= int_type(A). { X = A; }
@ -358,9 +472,6 @@ func_param_flags ::= func_param_flags IN.
func_param_flags ::= func_param_flags OUT.
func_param_flags ::= func_param_flags OPTIONAL.
struct_body ::= struct_member.
struct_body ::= struct_member struct_body.
/* Like UnrealScript, a constant's type is implied by its value's type. */
const_def ::= CONST IDENTIFIER EQ expr SEMICOLON.

55
src/zscript/zcc_parser.h
View file

@ -14,16 +14,20 @@ union ZCCToken
int Int;
double Float;
FString *String;
ENamedName Name() { return ENamedName(Int); }
};
// Syntax tree structures.
enum EZCCTreeNodeType
{
AST_Identifier,
AST_Class,
AST_Struct,
AST_Enum,
AST_EnumNode,
AST_States,
AST_StatePart,
AST_StateLabel,
AST_StateGoto,
AST_StateLine,
@ -58,6 +62,16 @@ enum EZCCTreeNodeType
AST_LocalVarStmt,
};
enum EZCCIntType
{
ZCCINT_SInt8,
ZCCINT_UInt8,
ZCCINT_SInt16,
ZCCINT_UInt16,
ZCCINT_SInt32,
ZCCINT_UInt32,
ZCCINT_Auto, // for enums, autoselect appropriately sized int
};
enum EZCCExprType
{
@ -151,49 +165,60 @@ struct ZCC_TreeNode
}
};
struct ZCC_Identifier : ZCC_TreeNode
{
ENamedName Id;
};
struct ZCC_Class : ZCC_TreeNode
{
FName ClassName;
FName ParentName;
ZCC_Identifier *ClassName;
ZCC_Identifier *ParentName;
ZCC_Identifier *Replaces;
VM_UWORD Flags;
ZCC_TreeNode *Body;
};
struct ZCC_Struct : ZCC_TreeNode
{
FName StructName;
ENamedName StructName;
ZCC_TreeNode *Body;
};
struct ZCC_Enum : ZCC_TreeNode
{
FName EnumName;
ENamedName EnumName;
EZCCIntType EnumType;
struct ZCC_EnumNode *Elements;
};
struct ZCC_EnumNode : ZCC_TreeNode
{
FName ElemName;
ENamedName ElemName;
ZCC_TreeNode *ElemValue;
};
struct ZCC_States : ZCC_TreeNode
{
ZCC_TreeNode *Body;
struct ZCC_StatePart *Body;
};
struct ZCC_StateLabel : ZCC_TreeNode
struct ZCC_StatePart : ZCC_TreeNode
{
FName Label;
};
struct ZCC_StateGoto : ZCC_TreeNode
struct ZCC_StateLabel : ZCC_StatePart
{
ENamedName Label;
};
struct ZCC_StateGoto : ZCC_StatePart
{
ZCC_TreeNode *Label;
ZCC_TreeNode *Offset;
};
struct ZCC_StateLine : ZCC_TreeNode
struct ZCC_StateLine : ZCC_StatePart
{
char Sprite[4];
FString *Frames;
@ -225,7 +250,7 @@ struct ZCC_Type : ZCC_TreeNode
struct ZCC_BasicType : ZCC_Type
{
PType *Type;
FName TypeName;
ENamedName TypeName;
};
struct ZCC_MapType : ZCC_Type
@ -241,12 +266,12 @@ struct ZCC_DynArrayType : ZCC_Type
struct ZCC_ClassType : ZCC_Type
{
FName Restriction;
ENamedName Restriction;
};
struct ZCC_ExprID : ZCC_Expression
{
FName Identifier;
ENamedName Identifier;
};
struct ZCC_ExprString : ZCC_Expression
@ -267,7 +292,7 @@ struct ZCC_ExprFloat : ZCC_Expression
struct ZCC_FuncParm : ZCC_TreeNode
{
ZCC_Expression *Value;
FName Label;
ENamedName Label;
};
struct ZCC_ExprFuncCall : ZCC_Expression
@ -279,7 +304,7 @@ struct ZCC_ExprFuncCall : ZCC_Expression
struct ZCC_ExprMemberAccess : ZCC_Expression
{
ZCC_Expression *Left;
FName Right;
ENamedName Right;
};
struct ZCC_ExprUnary : ZCC_Expression