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- fixed some issues with the grammar for parsing states:

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* Goto did not support the class scope operator '::'. Like in DECORATE, this cannot be done with a simple '.' because it creates semantic problems with first part of a state label. This requires different syntax so that it can unambiguously distinguish between a scope identifier and the actual label
 * Goto used the incorrect token PLUS for '+' instead of ADD.
 * The state's duration was not stored in the AST.
 * Truncating the sprite name inside the parser is probably not the best idea because it used a simple Printf to report this. Let's do this during processing of the AST where this can be properly handled as an error.
This commit is contained in:
Christoph Oelckers 2016-10-12 00:04:30 +02:00
parent d8c689d874
commit f46b6b5be5
3 changed files with 23 additions and 13 deletions
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4
src/zscript/ast.cpp
View file

@ -405,6 +405,7 @@ static void PrintStateGoto(FLispString &out, ZCC_TreeNode *node)
{
ZCC_StateGoto *snode = (ZCC_StateGoto *)node;
out.Open("state-goto");
PrintNodes(out, snode->Qualifier);
PrintNodes(out, snode->Label);
PrintNodes(out, snode->Offset);
out.Close();
@ -414,7 +415,8 @@ static void PrintStateLine(FLispString &out, ZCC_TreeNode *node)
{
ZCC_StateLine *snode = (ZCC_StateLine *)node;
out.Open("state-line");
out.Add(snode->Sprite, 4);
out.Add(*(snode->Sprite));
PrintNodes(out, snode->Duration);
if (snode->bNoDelay) out.Add("nodelay", 7);
if (snode->bBright) out.Add("bright", 6);
if (snode->bFast) out.Add("fast", 4);

28
src/zscript/zcc-parse.lemon
View file

@ -430,25 +430,31 @@ state_flow_type(X) ::= GOTO(T) dottable_id(A) state_goto_offset(B).
NEW_AST_NODE(StateGoto, flow, T);
flow->Label = A;
flow->Offset = B;
flow->Qualifier = nullptr;
X = flow;
}
state_flow_type(X) ::= GOTO(T) IDENTIFIER(C) SCOPE dottable_id(A) state_goto_offset(B).
{
NEW_AST_NODE(StateGoto, flow, T);
flow->Label = A;
flow->Offset = B;
NEW_AST_NODE(Identifier,id,C);
id->Id = C.Name();
flow->Qualifier =id;
X = flow;
}
state_goto_offset(X) ::= . { X = NULL; }
state_goto_offset(X) ::= PLUS expr(A). { X = A; /*X-overwrites-A*/ } /* Must evaluate to a non-negative integer constant. */
state_goto_offset(X) ::= ADD expr(A). { X = A; /*X-overwrites-A*/ } /* Must evaluate to a non-negative integer constant. */
state_line(X) ::= NWS(A) NWS(B) expr state_opts(C) state_action(D).
state_line(X) ::= NWS(A) NWS(B) expr(E) state_opts(C) state_action(D).
{
NEW_AST_NODE(StateLine, line, A);
const char *sprite = FName(A.Name()).GetChars();
if (strlen(sprite) != 4)
{
Printf("Sprite name '%s' must be four characters", sprite);
}
else
{
memcpy(line->Sprite, sprite, 4);
}
line->Sprite = stat->Strings.Alloc(FName(A.Name()).GetChars());
line->Frames = stat->Strings.Alloc(FName(B.Name()).GetChars());
line->Duration = E;
line->bBright = C.Bright;
line->bFast = C.Fast;
line->bSlow = C.Slow;

4
src/zscript/zcc_parser.h
View file

@ -260,19 +260,21 @@ struct ZCC_Expression : ZCC_TreeNode
struct ZCC_StateGoto : ZCC_StatePart
{
ZCC_Identifier *Qualifier;
ZCC_Identifier *Label;
ZCC_Expression *Offset;
};
struct ZCC_StateLine : ZCC_StatePart
{
char Sprite[4];
FString *Sprite;
BITFIELD bBright : 1;
BITFIELD bFast : 1;
BITFIELD bSlow : 1;
BITFIELD bNoDelay : 1;
BITFIELD bCanRaise : 1;
FString *Frames;
ZCC_Expression *Duration;
ZCC_Expression *Offset;
ZCC_TreeNode *Action;
};