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74 lines
2.7 KiB
OpenEdge ABL
74 lines
2.7 KiB
OpenEdge ABL
[CommentInstruction::] The Comment Construct.
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Defining the comment construct.
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@h Definition.
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Comments are present in Inter bytecode as actual instructions, enabling them
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to be preserved in binary Inter files. But they have no effect on the meaning
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or execution of a program.
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=
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void CommentInstruction::define_construct(void) {
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inter_construct *IC = InterInstruction::create_construct(COMMENT_IST, I"comment");
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InterInstruction::specify_syntax(IC, I"#ANY");
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InterInstruction::data_extent_always(IC, 1);
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METHOD_ADD(IC, CONSTRUCT_TRANSPOSE_MTID, CommentInstruction::transpose);
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METHOD_ADD(IC, CONSTRUCT_VERIFY_MTID, CommentInstruction::verify);
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METHOD_ADD(IC, CONSTRUCT_READ_MTID, CommentInstruction::read);
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METHOD_ADD(IC, CONSTRUCT_WRITE_MTID, CommentInstruction::write);
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InterInstruction::allow_in_depth_range(IC, 0, INFINITELY_DEEP);
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InterInstruction::permit(IC, OUTSIDE_OF_PACKAGES_ICUP);
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InterInstruction::permit(IC, INSIDE_PLAIN_PACKAGE_ICUP);
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InterInstruction::permit(IC, INSIDE_CODE_PACKAGE_ICUP);
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}
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@h Instructions.
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In bytecode, the frame of an |comment| instruction is laid out with the
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compulsory words -- see //Inter Nodes// -- followed by:
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@d TEXT_COMMENT_IFLD (DATA_IFLD + 0)
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=
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inter_error_message *CommentInstruction::new(inter_bookmark *IBM, text_stream *commentary,
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inter_error_location *eloc, inter_ti level) {
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inter_tree_node *P = Inode::new_with_1_data_field(IBM, COMMENT_IST,
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/* TEXT_COMMENT_IFLD: */ InterWarehouse::create_text_at(IBM, commentary),
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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 CommentInstruction::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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P->W.instruction[TEXT_COMMENT_IFLD] = grid[P->W.instruction[TEXT_COMMENT_IFLD]];
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}
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@ Verification consists only of sanity checks.
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=
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void CommentInstruction::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::text_field(owner, P, TEXT_COMMENT_IFLD);
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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 CommentInstruction::read(inter_construct *IC, inter_bookmark *IBM, inter_line_parse *ilp,
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inter_error_location *eloc, inter_error_message **E) {
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text_stream *commentary = ilp->mr.exp[0];
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*E = CommentInstruction::new(IBM, commentary, eloc, (inter_ti) ilp->indent_level);
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}
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@h Writing to textual Inter syntax.
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The empty comment is printed back as a blank line, rather than a lone |#|.
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=
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void CommentInstruction::write(inter_construct *IC, OUTPUT_STREAM, inter_tree_node *P) {
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text_stream *S = Inode::ID_to_text(P, P->W.instruction[TEXT_COMMENT_IFLD]);
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if (Str::len(S) > 0) WRITE("#%S", S);
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}
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