mirror of
https://github.com/ZDoom/gzdoom.git
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- More AST'ing about.
SVN r2359 (scripting)
This commit is contained in:
parent
c043627cc1
commit
85d869315b
2 changed files with 192 additions and 56 deletions
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@ -1,10 +1,15 @@
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%include
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{
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// Allocates a new AST node off the parse state's arena.
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#define NEW_AST_NODE(type,name) \
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ZCC_##type *name = (ZCC_##type *)stat->SyntaxArena.Alloc(sizeof(ZCC_##type)); \
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name->SiblingNext = name; \
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name->SiblingPrev = name; \
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name->NodeType = AST_##type
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// If a is non-null, appends b to a. Otherwise, sets a to b.
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#define SAFE_APPEND(a,b) \
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if (a == NULL) a = b; else a->AppendSibling(b);
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}
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%token_prefix ZCC_
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@ -87,23 +92,76 @@ opt_expr(X) ::= expr(A).
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}
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/* A class definition. Can only occur at global scope. */
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class_definition ::= class_start class_body.
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/************ Class Definition ************/
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/* Can only occur at global scope. */
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%type class_definition{ZCC_Class *}
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%type class_head{ZCC_Class *}
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%type class_innards{ZCC_Class *}
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%type class_body{ZCC_TreeNode *}
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class_definition(X) ::= class_head(A) class_body(B).
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{
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/* stat->CurrClass = NULL;*/
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A->Body = B;
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X = A;
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}
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class_start ::= CLASS IDENTIFIER class_ancestry class_flags.
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class_head(X) ::= CLASS dottable_id(A) class_ancestry(B) class_flags(C).
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{
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NEW_AST_NODE(Class,head);
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head->ClassName = A;
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head->ParentName = B;
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head->Flags = C.Flags;
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head->Replaces = C.Replaces;
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X = head;
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}
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%type class_ancestry {ENamedName}
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class_ancestry(X) ::= . { X = NAME_Object; }
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class_ancestry(X) ::= COLON IDENTIFIER(A). { X = ENamedName(A.Int); }
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%type class_ancestry{ZCC_Identifier *}
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class_ancestry(X) ::= . { X = NULL; }
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class_ancestry(X) ::= COLON dottable_id(A). { X = A; }
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class_flags ::= .
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class_flags ::= class_flags ABSTRACT.
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class_flags ::= class_flags NATIVE.
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class_flags ::= class_flags REPLACES IDENTIFIER.
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%type class_flags{ClassFlagsBlock}
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%include{
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struct ClassFlagsBlock {
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VM_UWORD Flags;
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ZCC_Identifier *Replaces;
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};
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}
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class_flags(X) ::= . { X.Flags = 0; X.Replaces = NULL; }
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class_flags(X) ::= class_flags(A) ABSTRACT. { X.Flags = A.Flags | 0/*FIXME*/; X.Replaces = A.Replaces; }
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class_flags(X) ::= class_flags(A) NATIVE. { X.Flags = A.Flags | 0/*FIXME*/; X.Replaces = A.Replaces; }
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class_flags(X) ::= class_flags(A) REPLACES dottable_id(B). { X.Flags = A.Flags; X.Replaces = B; }
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/*----- Dottable Identifier -----*/
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// This can be either a single identifier or two identifiers connected by a .
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%type dottable_id{ZCC_Identifier *}
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dottable_id(X) ::= IDENTIFIER(A).
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{
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NEW_AST_NODE(Identifier,id);
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id->Id = A.Name();
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X = id;
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}
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dottable_id(X) ::= IDENTIFIER(A) DOT IDENTIFIER(B).
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{
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NEW_AST_NODE(Identifier,id1);
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NEW_AST_NODE(Identifier,id2);
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id1->Id = A.Name();
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id2->Id = B.Name();
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id1->AppendSibling(id2);
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X = id1;
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}
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/*------ Class Body ------*/
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// Body is a list of:
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// * variable definitions
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// * function definitions
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// * enum definitions
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// * struct definitions
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// * state definitions
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// * constants
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// * defaults
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class_body ::= SEMICOLON class_innards EOF.
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class_body ::= LBRACE class_innards RBRACE.
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@ -111,7 +169,10 @@ class_body ::= LBRACE class_innards RBRACE.
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class_innards ::= .
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class_innards ::= class_innards class_member.
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/* Classes can define variables, functions, enums, structs, states, constants, and defaults. */
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%type struct_def{ZCC_Struct *}
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%type enum_def {ZCC_Enum *}
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%type states_def {ZCC_States *}
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class_member ::= declarator.
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class_member ::= enum_def.
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class_member ::= struct_def.
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@ -119,25 +180,79 @@ class_member ::= states_def.
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class_member ::= default_def.
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class_member ::= const_def.
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/* Structs can define variables, enums, and structs. */
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struct_def ::= STRUCT IDENTIFIER LBRACE struct_body RBRACE opt_semicolon.
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struct_member ::= declarator_no_fun.
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struct_member ::= enum_def.
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/*----- Struct Definition -----*/
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/* Structs can define variables, enums<s>, and structs</s>. */
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%type struct_body{ZCC_TreeNode *}
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%type struct_member{ZCC_TreeNode *}
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struct_def(X) ::= STRUCT IDENTIFIER(A) LBRACE struct_body(B) RBRACE opt_semicolon.
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{
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NEW_AST_NODE(Struct,def);
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def->StructName = A.Name();
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def->Body = B;
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X = def;
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}
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struct_body(X) ::= error. { X = NULL; }
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struct_body(X) ::= struct_member(A). { X = A; }
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struct_body(X) ::= struct_member(A) struct_body(B). { X = A; A->AppendSibling(B); }
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struct_member(X) ::= declarator_no_fun(A). { X = A; }
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struct_member(X) ::= enum_def(A). { X = A; }
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/*----- Enum Definition -----*/
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/* Enumerators are lists of named integers. */
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enum_def ::= ENUM IDENTIFIER enum_type LBRACE enum_list opt_comma RBRACE opt_semicolon.
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enum_type ::= .
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enum_type ::= COLON int_type.
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%type enum_type {EZCCIntType}
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%type enum_list {ZCC_EnumNode *}
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%type enumerator {ZCC_EnumNode *}
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enum_list ::= enumerator.
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enum_list ::= enum_list COMMA enumerator.
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enum_def(X) ::= ENUM IDENTIFIER(A) enum_type(B) LBRACE enum_list(C) opt_comma RBRACE opt_semicolon.
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{
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NEW_AST_NODE(Enum,def);
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def->EnumName = A.Name();
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def->EnumType = B;
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def->Elements = C;
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X = def;
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}
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enumerator ::= IDENTIFIER.
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enumerator ::= IDENTIFIER EQ expr. /* Expression must be constant. */
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enum_type(X) ::= . { X = ZCCINT_Auto; }
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enum_type(X) ::= COLON int_type(A). { X = A; }
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/* States */
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states_def ::= STATES scanner_mode LBRACE states_body RBRACE.
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enum_list(X) ::= error. { X = NULL; }
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enum_list(X) ::= enumerator(A). { X = A; }
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enum_list(X) ::= enum_list(A) COMMA enumerator(B). { X = A; A->AppendSibling(B); }
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enumerator(X) ::= IDENTIFIER(A).
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{
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NEW_AST_NODE(EnumNode,node);
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node->ElemName = A.Name();
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node->ElemValue = NULL;
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X = node;
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}
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enumerator(X) ::= IDENTIFIER(A) EQ expr(B). /* Expression must be constant. */
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{
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NEW_AST_NODE(EnumNode,node);
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node->ElemName = A.Name();
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node->ElemValue = B;
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X = node;
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}
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/************ States ************/
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%type states_body {ZCC_StatePart *}
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%type state_line {ZCC_StatePart *}
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%type state_label {ZCC_StatePart *}
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%type state_flow {ZCC_StatePart *}
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states_def(X) ::= STATES scanner_mode LBRACE states_body(A) RBRACE.
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{
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NEW_AST_NODE(States,def);
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def->Body = A;
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X = def;
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}
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/* We use a special scanner mode to allow for sprite names and frame characters
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* to not be quoted even if they contain special characters. The scanner_mode
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*/
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scanner_mode ::= . { stat->sc.SetStateMode(true); }
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states_body ::= .
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states_body ::= error.
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/*states_body ::= states_body LABELID.*/
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states_body ::= states_body state_line.
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states_body ::= states_body state_label.
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states_body ::= states_body state_flow.
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states_body(X) ::= . { X = NULL; }
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states_body(X) ::= error. { X = NULL; }
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states_body(X) ::= states_body(A) state_line(B). { SAFE_APPEND(A,B); X = A; }
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states_body(X) ::= states_body(A) state_label(B). { SAFE_APPEND(A,B); X = A; }
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states_body(X) ::= states_body(A) state_flow(B). { SAFE_APPEND(A,B); X = A; }
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state_label ::= NWS(A) COLON.
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{ Printf("Label %s\n", FName(ENamedName(A.Int)).GetChars()); }
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default_def ::= DEFAULT compound_statement.
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/* Type names */
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%type int_type {PType *}
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%type int_type {EZCCIntType}
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%type type_name {PType *}
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int_type(X) ::= SBYTE. { X = TypeSInt8; }
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int_type(X) ::= BYTE. { X = TypeUInt8; }
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int_type(X) ::= SHORT. { X = TypeSInt16; }
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int_type(X) ::= USHORT. { X = TypeUInt16; }
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int_type(X) ::= INT. { X = TypeSInt32; }
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int_type(X) ::= UINT. { X = TypeUInt32; }
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int_type(X) ::= SBYTE. { X = ZCCINT_SInt8; }
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int_type(X) ::= BYTE. { X = ZCCINT_UInt8; }
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int_type(X) ::= SHORT. { X = ZCCINT_SInt16; }
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int_type(X) ::= USHORT. { X = ZCCINT_UInt16; }
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int_type(X) ::= INT. { X = ZCCINT_SInt32; }
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int_type(X) ::= UINT. { X = ZCCINT_UInt32; }
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type_name(X) ::= BOOL. { /*FIXME*/ X = TypeBool; }
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type_name(X) ::= int_type(A). { X = A; }
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func_param_flags ::= func_param_flags OUT.
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func_param_flags ::= func_param_flags OPTIONAL.
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struct_body ::= struct_member.
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struct_body ::= struct_member struct_body.
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/* Like UnrealScript, a constant's type is implied by its value's type. */
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const_def ::= CONST IDENTIFIER EQ expr SEMICOLON.
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@ -14,16 +14,20 @@ union ZCCToken
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int Int;
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double Float;
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FString *String;
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ENamedName Name() { return ENamedName(Int); }
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};
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// Syntax tree structures.
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enum EZCCTreeNodeType
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{
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AST_Identifier,
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AST_Class,
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AST_Struct,
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AST_Enum,
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AST_EnumNode,
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AST_States,
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AST_StatePart,
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AST_StateLabel,
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AST_StateGoto,
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AST_StateLine,
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AST_LocalVarStmt,
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};
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enum EZCCIntType
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{
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ZCCINT_SInt8,
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ZCCINT_UInt8,
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ZCCINT_SInt16,
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ZCCINT_UInt16,
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ZCCINT_SInt32,
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ZCCINT_UInt32,
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ZCCINT_Auto, // for enums, autoselect appropriately sized int
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};
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enum EZCCExprType
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{
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}
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};
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struct ZCC_Identifier : ZCC_TreeNode
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{
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ENamedName Id;
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};
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struct ZCC_Class : ZCC_TreeNode
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{
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FName ClassName;
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FName ParentName;
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ZCC_Identifier *ClassName;
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ZCC_Identifier *ParentName;
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ZCC_Identifier *Replaces;
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VM_UWORD Flags;
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ZCC_TreeNode *Body;
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};
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struct ZCC_Struct : ZCC_TreeNode
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{
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FName StructName;
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ENamedName StructName;
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ZCC_TreeNode *Body;
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};
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struct ZCC_Enum : ZCC_TreeNode
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{
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FName EnumName;
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ENamedName EnumName;
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EZCCIntType EnumType;
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struct ZCC_EnumNode *Elements;
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};
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struct ZCC_EnumNode : ZCC_TreeNode
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{
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FName ElemName;
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ENamedName ElemName;
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ZCC_TreeNode *ElemValue;
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};
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struct ZCC_States : ZCC_TreeNode
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{
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ZCC_TreeNode *Body;
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struct ZCC_StatePart *Body;
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};
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struct ZCC_StateLabel : ZCC_TreeNode
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struct ZCC_StatePart : ZCC_TreeNode
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{
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FName Label;
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};
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struct ZCC_StateGoto : ZCC_TreeNode
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struct ZCC_StateLabel : ZCC_StatePart
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{
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ENamedName Label;
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};
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struct ZCC_StateGoto : ZCC_StatePart
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{
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ZCC_TreeNode *Label;
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ZCC_TreeNode *Offset;
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};
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struct ZCC_StateLine : ZCC_TreeNode
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struct ZCC_StateLine : ZCC_StatePart
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{
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char Sprite[4];
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FString *Frames;
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struct ZCC_BasicType : ZCC_Type
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{
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PType *Type;
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FName TypeName;
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ENamedName TypeName;
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};
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struct ZCC_MapType : ZCC_Type
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@ -241,12 +266,12 @@ struct ZCC_DynArrayType : ZCC_Type
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struct ZCC_ClassType : ZCC_Type
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{
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FName Restriction;
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ENamedName Restriction;
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};
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struct ZCC_ExprID : ZCC_Expression
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{
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FName Identifier;
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ENamedName Identifier;
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};
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struct ZCC_ExprString : ZCC_Expression
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struct ZCC_FuncParm : ZCC_TreeNode
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{
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ZCC_Expression *Value;
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FName Label;
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ENamedName Label;
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};
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struct ZCC_ExprFuncCall : ZCC_Expression
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@ -279,7 +304,7 @@ struct ZCC_ExprFuncCall : ZCC_Expression
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struct ZCC_ExprMemberAccess : ZCC_Expression
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{
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ZCC_Expression *Left;
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FName Right;
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ENamedName Right;
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};
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struct ZCC_ExprUnary : ZCC_Expression
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