mirror of
https://github.com/ganelson/inform.git
synced 2024-07-08 01:54:21 +03:00
119 lines
4.4 KiB
OpenEdge ABL
119 lines
4.4 KiB
OpenEdge ABL
[VariableInstruction::] The Variable Construct.
|
|
|
|
Defining the variable construct.
|
|
|
|
@h Definition.
|
|
For what this does and why it is used, see //inter: Textual Inter//.
|
|
|
|
=
|
|
void VariableInstruction::define_construct(void) {
|
|
inter_construct *IC = InterInstruction::create_construct(VARIABLE_IST, I"variable");
|
|
InterInstruction::defines_symbol_in_fields(IC, DEFN_VAR_IFLD, TYPE_VAR_IFLD);
|
|
InterInstruction::specify_syntax(IC, I"variable TOKENS = TOKENS");
|
|
InterInstruction::fix_instruction_length_between(IC, 6, 6);
|
|
InterInstruction::permit(IC, INSIDE_PLAIN_PACKAGE_ICUP);
|
|
InterInstruction::permit(IC, CAN_HAVE_ANNOTATIONS_ICUP);
|
|
METHOD_ADD(IC, CONSTRUCT_READ_MTID, VariableInstruction::read);
|
|
METHOD_ADD(IC, CONSTRUCT_TRANSPOSE_MTID, VariableInstruction::transpose);
|
|
METHOD_ADD(IC, CONSTRUCT_VERIFY_MTID, VariableInstruction::verify);
|
|
METHOD_ADD(IC, CONSTRUCT_WRITE_MTID, VariableInstruction::write);
|
|
}
|
|
|
|
@h Instructions.
|
|
In bytecode, the frame of a |propertyvalue| instruction is laid out with the two
|
|
compulsory words |ID_IFLD| and |LEVEL_IFLD|, followed by:
|
|
|
|
@d DEFN_VAR_IFLD 2
|
|
@d TYPE_VAR_IFLD 3
|
|
@d VAL1_VAR_IFLD 4
|
|
@d VAL2_VAR_IFLD 5
|
|
|
|
=
|
|
inter_error_message *VariableInstruction::new(inter_bookmark *IBM, inter_symbol *var_s,
|
|
inter_type var_type, inter_pair val, inter_ti level, inter_error_location *eloc) {
|
|
inter_tree_node *P = Inode::new_with_4_data_fields(IBM, VARIABLE_IST,
|
|
/* DEFN_VAR_IFLD: */ InterSymbolsTable::id_at_bookmark(IBM, var_s),
|
|
/* TYPE_VAR_IFLD: */ InterTypes::to_TID_at(IBM, var_type),
|
|
/* VAL1_VAR_IFLD: */ InterValuePairs::to_word1(val),
|
|
/* VAL2_VAR_IFLD: */ InterValuePairs::to_word2(val),
|
|
eloc, level);
|
|
inter_error_message *E = VerifyingInter::instruction(InterBookmark::package(IBM), P);
|
|
if (E) return E;
|
|
NodePlacement::move_to_moving_bookmark(P, IBM);
|
|
return NULL;
|
|
}
|
|
|
|
void VariableInstruction::transpose(inter_construct *IC, inter_tree_node *P,
|
|
inter_ti *grid, inter_ti grid_extent, inter_error_message **E) {
|
|
InterValuePairs::set(P, VAL1_PVAL_IFLD,
|
|
InterValuePairs::transpose(InterValuePairs::get(P, VAL1_PVAL_IFLD), grid, grid_extent, E));
|
|
}
|
|
|
|
@ Verification consists only of sanity checks.
|
|
|
|
=
|
|
void VariableInstruction::verify(inter_construct *IC, inter_tree_node *P,
|
|
inter_package *owner, inter_error_message **E) {
|
|
*E = VerifyingInter::TID_field(owner, P, TYPE_VAR_IFLD);
|
|
if (*E) return;
|
|
inter_type type = InterTypes::from_TID_in_field(P, TYPE_VAR_IFLD);
|
|
*E = VerifyingInter::data_pair_fields(owner, P, VAL1_VAR_IFLD, type);
|
|
if (*E) return;
|
|
}
|
|
|
|
@h Creating from textual Inter syntax.
|
|
|
|
=
|
|
void VariableInstruction::read(inter_construct *IC, inter_bookmark *IBM,
|
|
inter_line_parse *ilp, inter_error_location *eloc, inter_error_message **E) {
|
|
text_stream *type_text = NULL, *name_text = ilp->mr.exp[0];
|
|
match_results mr = Regexp::create_mr();
|
|
if (Regexp::match(&mr, name_text, L"%((%c+)%) (%c+)")) {
|
|
type_text = mr.exp[0]; name_text = mr.exp[1];
|
|
}
|
|
inter_type var_type =
|
|
InterTypes::parse_simple(InterBookmark::scope(IBM), eloc, type_text, E);
|
|
inter_symbol *var_s = NULL;
|
|
if (*E == NULL)
|
|
var_s = TextualInter::new_symbol(eloc, InterBookmark::scope(IBM), name_text, E);
|
|
Regexp::dispose_of(&mr);
|
|
if (*E) return;
|
|
|
|
SymbolAnnotation::copy_set_to_symbol(&(ilp->set), var_s);
|
|
|
|
inter_pair val = InterValuePairs::undef();
|
|
*E = TextualInter::parse_pair(ilp->line, eloc, IBM, var_type, ilp->mr.exp[1], &val);
|
|
if (*E) return;
|
|
|
|
*E = VariableInstruction::new(IBM, var_s, var_type, val,
|
|
(inter_ti) ilp->indent_level, eloc);
|
|
}
|
|
|
|
@h Writing to textual Inter syntax.
|
|
|
|
=
|
|
void VariableInstruction::write(inter_construct *IC, OUTPUT_STREAM, inter_tree_node *P,
|
|
inter_error_message **E) {
|
|
inter_symbol *var_s = VariableInstruction::variable(P);
|
|
WRITE("variable ");
|
|
TextualInter::write_optional_type_marker(OUT, P, TYPE_VAR_IFLD);
|
|
WRITE("%S = ", InterSymbol::identifier(var_s));
|
|
TextualInter::write_pair(OUT, P, VariableInstruction::value(P), FALSE);
|
|
SymbolAnnotation::write_annotations(OUT, P, var_s);
|
|
}
|
|
|
|
@h Access functions.
|
|
|
|
=
|
|
inter_symbol *VariableInstruction::variable(inter_tree_node *P) {
|
|
if (P == NULL) return NULL;
|
|
if (P->W.instruction[ID_IFLD] != VARIABLE_IST) return NULL;
|
|
return InterSymbolsTable::symbol_from_ID_at_node(P, DEFN_VAR_IFLD);
|
|
}
|
|
|
|
inter_pair VariableInstruction::value(inter_tree_node *P) {
|
|
if (P == NULL) return InterValuePairs::undef();
|
|
if (P->W.instruction[ID_IFLD] != VARIABLE_IST) return InterValuePairs::undef();
|
|
return InterValuePairs::get(P, VAL1_VAR_IFLD);
|
|
}
|