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