111 lines
2.9 KiB
C
111 lines
2.9 KiB
C
/**
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* print.c
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*
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* First pass at a printer, for bootstrapping.
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*
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*
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* (c) 2017 Simon Brooke <simon@journeyman.cc>
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* Licensed under GPL version 2.0, or, at your option, any later version.
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*/
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#include <ctype.h>
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#include <stdio.h>
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#include <string.h>
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/*
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* wide characters
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*/
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#include <wchar.h>
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#include <wctype.h>
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#include "conspage.h"
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#include "consspaceobject.h"
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#include "integer.h"
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#include "print.h"
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void print_string_contents( FILE * output, struct cons_pointer pointer ) {
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if ( stringp( pointer ) || symbolp( pointer ) ) {
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struct cons_space_object *cell = &pointer2cell( pointer );
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wint_t c = cell->payload.string.character;
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if ( c != '\0' ) {
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fputwc( c, output );
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}
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print_string_contents( output, cell->payload.string.cdr );
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}
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}
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void print_string( FILE * output, struct cons_pointer pointer ) {
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fputwc( btowc( '"' ), output );
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print_string_contents( output, pointer );
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fputwc( btowc( '"' ), output );
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}
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/**
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* Print a single list cell (cons cell). TODO: does not handle dotted pairs.
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*/
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void
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print_list_contents( FILE * output, struct cons_pointer pointer,
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bool initial_space ) {
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struct cons_space_object *cell = &pointer2cell( pointer );
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switch ( cell->tag.value ) {
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case CONSTV:
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if ( initial_space ) {
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fputwc( btowc( ' ' ), output );
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}
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print( output, cell->payload.cons.car );
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print_list_contents( output, cell->payload.cons.cdr, true );
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break;
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case NILTV:
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break;
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default:
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fwprintf( output, L" . " );
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print( output, pointer );
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}
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}
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void print_list( FILE * output, struct cons_pointer pointer ) {
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fputwc( btowc( '(' ), output );
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print_list_contents( output, pointer, false );
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fputwc( btowc( ')' ), output );
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}
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void print( FILE * output, struct cons_pointer pointer ) {
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struct cons_space_object cell = pointer2cell( pointer );
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/*
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* Because tags have values as well as bytes, this if ... else if
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* statement can ultimately be replaced by a switch, which will be neater.
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*/
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switch ( cell.tag.value ) {
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case CONSTV:
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print_list( output, pointer );
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break;
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case INTEGERTV:
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fwprintf( output, L"%ld", cell.payload.integer.value );
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break;
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case NILTV:
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fwprintf( output, L"nil" );
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break;
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case REALTV:
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fwprintf( output, L"%lf", cell.payload.real.value );
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break;
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case STRINGTV:
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print_string( output, pointer );
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break;
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case SYMBOLTV:
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print_string_contents( output, pointer );
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break;
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case TRUETV:
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fwprintf( output, L"t" );
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break;
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default:
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fwprintf( stderr,
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L"Error: Unrecognised tag value %d (%c%c%c%c)\n",
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cell.tag.value, cell.tag.bytes[0], cell.tag.bytes[1],
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cell.tag.bytes[2], cell.tag.bytes[3] );
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break;
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}
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}
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