{
/* lex_do kills the previous token */
parser->tok = lex_do(parser->lex);
- if (parser->tok == TOKEN_EOF || parser->tok >= TOKEN_ERROR)
+ if (parser->tok == TOKEN_EOF)
return false;
+ if (parser->tok >= TOKEN_ERROR) {
+ parseerror(parser, "lex error");
+ return false;
+ }
return true;
}
op = &operators[o];
/* when declaring variables, a comma starts a new variable */
- if (op->id == opid1(',') && !parens && stopatcomma)
+ if (op->id == opid1(',') && !parens && stopatcomma) {
+ /* fixup the token */
+ parser->tok = ',';
break;
+ }
if (sy.ops_count && !sy.ops[sy.ops_count-1].paren)
olast = &operators[sy.ops[sy.ops_count-1].etype-1];
if (!parser_next(parser)) {
goto onerr;
}
- if (parser->tok == ';') {
+ if (parser->tok == ';' || parser->tok == ']') {
break;
}
}
if (!parser_next(parser))
return false;
- } else if (parser->tok == '{') {
+ } else if (parser->tok == '{' || parser->tok == '[') {
/* function body */
+ ast_function *old;
ast_block *block;
size_t parami;
- ast_function *old = parser->function;
+
+ ast_expression *fld_think, *fld_nextthink, *fld_frame;
+ ast_expression *gbl_time, *gbl_self;
+ ast_expression *framenum, *nextthink;
+ bool has_frame_think;
+
+ has_frame_think = false;
+ old = parser->function;
if (localblock) {
parseerror(parser, "cannot declare functions within functions");
return false;
}
+ if (parser->tok == '[') {
+ /* got a frame definition: [ framenum, nextthink ]
+ * this translates to:
+ * self.frame = framenum;
+ * self.nextthink = time + 0.1;
+ * self.think = nextthink;
+ */
+ fld_think = parser_find_field(parser, "think");
+ fld_nextthink = parser_find_field(parser, "nextthink");
+ fld_frame = parser_find_field(parser, "frame");
+ if (!fld_think || !fld_nextthink || !fld_frame) {
+ parseerror(parser, "cannot use [frame,think] notation without the required fields");
+ parseerror(parser, "please declare the following entityfields: `frame`, `think`, `nextthink`");
+ return false;
+ }
+ gbl_time = parser_find_global(parser, "time");
+ gbl_self = parser_find_global(parser, "self");
+ if (!gbl_time || !gbl_self) {
+ parseerror(parser, "cannot use [frame,think] notation without the required globals");
+ parseerror(parser, "please declare the following globals: `time`, `self`");
+ return false;
+ }
+
+ if (!parser_next(parser)) {
+ return false;
+ }
+
+ framenum = parser_expression_leave(parser, true);
+ if (!framenum) {
+ parseerror(parser, "expected a framenumber constant in[frame,think] notation");
+ return false;
+ }
+ if (!ast_istype(framenum, ast_value) || !( (ast_value*)framenum )->isconst) {
+ ast_unref(framenum);
+ parseerror(parser, "framenumber in [frame,think] notation must be a constant");
+ }
+
+ if (parser->tok != ',') {
+ ast_unref(framenum);
+ parseerror(parser, "expected comma after frame number in [frame,think] notation");
+ parseerror(parser, "Got a %i\n", parser->tok);
+ return false;
+ }
+
+ if (!parser_next(parser)) {
+ ast_unref(framenum);
+ return false;
+ }
+
+ nextthink = parser_expression_leave(parser, true);
+ if (!nextthink) {
+ ast_unref(framenum);
+ parseerror(parser, "expected a think-function in [frame,think] notation");
+ return false;
+ }
+
+ if (!ast_istype(nextthink, ast_value) || !( (ast_value*)nextthink )->isconst) {
+ ast_unref(nextthink);
+ ast_unref(framenum);
+ parseerror(parser, "think-function in [frame,think] notation must be a constant");
+ }
+
+ if (parser->tok != ']') {
+ parseerror(parser, "expected closing `]` for [frame,think] notation");
+ ast_unref(nextthink);
+ ast_unref(framenum);
+ return false;
+ }
+
+ if (!parser_next(parser)) {
+ ast_unref(nextthink);
+ ast_unref(framenum);
+ return false;
+ }
+
+ if (parser->tok != '{') {
+ parseerror(parser, "a function body has to be declared after a [frame,think] declaration");
+ ast_unref(nextthink);
+ ast_unref(framenum);
+ return false;
+ }
+
+ has_frame_think = true;
+ }
+
block = ast_block_new(parser_ctx(parser));
if (!block) {
parseerror(parser, "failed to allocate block");
return false;
}
+ if (has_frame_think) {
+ lex_ctx ctx;
+ ast_expression *self_frame;
+ ast_expression *self_nextthink;
+ ast_expression *self_think;
+ ast_expression *time_plus_1;
+ ast_store *store_frame;
+ ast_store *store_nextthink;
+ ast_store *store_think;
+
+ ctx = parser_ctx(parser);
+ self_frame = (ast_expression*)ast_entfield_new(ctx, gbl_self, fld_frame);
+ self_nextthink = (ast_expression*)ast_entfield_new(ctx, gbl_self, fld_nextthink);
+ self_think = (ast_expression*)ast_entfield_new(ctx, gbl_self, fld_think);
+
+ time_plus_1 = (ast_expression*)ast_binary_new(ctx, INSTR_ADD_F,
+ gbl_time, (ast_expression*)parser_const_float(parser, 0.1));
+
+ store_frame = ast_store_new(ctx, INSTR_STOREP_F, self_frame, framenum);
+ store_nextthink = ast_store_new(ctx, INSTR_STOREP_F, self_nextthink, time_plus_1);
+ store_think = ast_store_new(ctx, INSTR_STOREP_FNC, self_think, nextthink);
+
+ if (!ast_block_exprs_add(block, (ast_expression*)store_frame) ||
+ !ast_block_exprs_add(block, (ast_expression*)store_nextthink) ||
+ !ast_block_exprs_add(block, (ast_expression*)store_think) )
+ {
+ parseerror(parser, "failed to generate code for [frame,think]");
+ ast_block_delete(block);
+ return false;
+ }
+ }
+
for (parami = 0; parami < var->expression.params_count; ++parami) {
ast_value *param = var->expression.params[parami];
varentry_t vx, vy, vz;