06a1d2e33d
[INTERPRETER] * NEW: Support for the new Eval() feature. [GB.EVAL] * NEW: 'Eval()' now can evaluate several expressions at once, provided that they are separated by newlines. The value of the last expression is returned. * NEW: 'Eval()' now returns NULL if its last expression returns nothing.
759 lines
13 KiB
C
759 lines
13 KiB
C
/***************************************************************************
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eval_read.c
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(c) 2000-2017 Benoît Minisini <benoit.minisini@gambas-basic.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA.
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***************************************************************************/
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#define __EVAL_READ_C
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#include <ctype.h>
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#include "gb_common.h"
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#include "gb_error.h"
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#include "gb_table.h"
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#include "eval.h"
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#include "eval_read.h"
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//#define DEBUG 1
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const char *READ_source_ptr;
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#define source_ptr READ_source_ptr
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static bool is_init = FALSE;
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static bool _begin_line = FALSE;
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static char ident_car[256];
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static char first_car[256];
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static char noop_car[256];
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static char canres_car[256];
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#undef isspace
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#define isspace(_c) (((uchar)_c) <= ' ')
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#undef isdigit
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#define isdigit(_c) ((_c) >= '0' && (_c) <= '9')
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enum
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{
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GOTO_BREAK,
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GOTO_SPACE,
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GOTO_NEWLINE,
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GOTO_COMMENT,
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GOTO_STRING,
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GOTO_IDENT,
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GOTO_QUOTED_IDENT,
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GOTO_ERROR,
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GOTO_SHARP,
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GOTO_NUMBER,
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GOTO_NUMBER_OR_OPERATOR,
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GOTO_OPERATOR
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};
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static void READ_init(void)
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{
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unsigned char i;
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if (!is_init)
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{
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for (i = 0; i < 255; i++)
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{
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ident_car[i] = (i != 0) && ((i >= 'A' && i <= 'Z') || (i >= 'a' && i <= 'z') || (i >= '0' && i <= '9') || strchr("$_?@", i));
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noop_car[i] = ident_car[i] || (i >= '0' && i <= '9') || i <= ' ';
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canres_car[i] = (i != ':') && (i != '.') && (i != '!') && (i != '(');
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if (i == 0)
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first_car[i] = GOTO_BREAK;
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else if (i == '\n')
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first_car[i] = GOTO_NEWLINE;
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else if (i <= ' ')
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first_car[i] = GOTO_SPACE;
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else if (i == '\'')
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first_car[i] = GOTO_COMMENT;
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else if (i == '"')
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first_car[i] = GOTO_STRING;
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else if (i == '#')
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first_car[i] = GOTO_SHARP;
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else if ((i >= 'A' && i <= 'Z') || (i >= 'a' && i <= 'z') || i == '$' || i == '_')
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first_car[i] = GOTO_IDENT;
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else if (i == '{')
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first_car[i] = GOTO_QUOTED_IDENT;
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else if (i >= '0' && i <= '9')
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first_car[i] = GOTO_NUMBER;
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else if (i >= 127)
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first_car[i] = GOTO_ERROR;
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else if (i == '+' || i == '-' || i == '&')
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first_car[i] = GOTO_NUMBER_OR_OPERATOR;
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else
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first_car[i] = GOTO_OPERATOR;
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}
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is_init = TRUE;
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}
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}
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static bool _no_quote = FALSE;
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#define BUF_MAX 255
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static char _buffer[BUF_MAX + 1];
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char *READ_get_pattern(PATTERN *pattern)
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{
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int type = PATTERN_type(*pattern);
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int index = PATTERN_index(*pattern);
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const char *str;
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const char *before = _no_quote ? "" : "'";
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const char *after = _no_quote ? "" : "'";
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switch(type)
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{
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case RT_RESERVED:
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//snprintf(COMMON_buffer, COMMON_BUF_MAX, "%s%s%s", before, TABLE_get_symbol_name(COMP_res_table, index), after);
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str = COMP_res_info[index].name;
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if (ispunct((unsigned char)*str))
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snprintf(_buffer, BUF_MAX, "%s%s%s", before, str, after);
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else
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strcpy(_buffer, str);
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break;
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case RT_INTEGER:
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snprintf(_buffer, BUF_MAX, "%s%d%s", before, PATTERN_signed_index(*pattern), after);
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break;
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case RT_NUMBER:
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case RT_IDENTIFIER:
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case RT_CLASS:
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snprintf(_buffer, BUF_MAX, "%s%s%s", before, TABLE_get_symbol_name(EVAL->table, index), after);
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break;
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case RT_STRING:
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case RT_TSTRING:
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if (_no_quote)
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snprintf(_buffer, BUF_MAX, "\"%s\"", TABLE_get_symbol_name(EVAL->string, index));
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else
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strcpy(_buffer, "string");
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break;
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case RT_NEWLINE:
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case RT_END:
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strcpy(_buffer, "end of expression");
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break;
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case RT_SUBR:
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//snprintf(COMMON_buffer, COMMON_BUF_MAX, "%s%s%s", bafore, COMP_subr_info[index].name, after);
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strcpy(_buffer, COMP_subr_info[index].name);
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break;
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case RT_COMMENT:
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strncpy(_buffer, TABLE_get_symbol_name(EVAL->string, index), BUF_MAX);
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_buffer[BUF_MAX] = 0;
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break;
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case RT_SPACE:
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snprintf(_buffer, BUF_MAX, "[%d]", index);
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break;
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default:
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sprintf(_buffer, "%s?%08X?%s", before, *pattern, after);
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}
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return _buffer;
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}
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#if DEBUG
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void READ_dump_pattern(PATTERN *pattern)
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{
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int type = PATTERN_type(*pattern);
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int index = PATTERN_index(*pattern);
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int pos;
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pos = (int)(pattern - EVAL->pattern);
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if (pos < 0 || pos >= EVAL->pattern_count)
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return;
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printf("%d ", pos);
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if (PATTERN_flag(*pattern) & RT_FIRST)
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printf("!");
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else
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printf(" ");
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if (PATTERN_flag(*pattern) & RT_POINT)
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printf(".");
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else
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printf(" ");
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if (PATTERN_flag(*pattern) & RT_CLASS)
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printf("C");
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else
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printf(" ");
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printf(" ");
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_no_quote = TRUE;
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if (type == RT_RESERVED)
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printf("RESERVED %s\n", READ_get_pattern(pattern));
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else if (type == RT_INTEGER)
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printf("INTEGER %s\n", READ_get_pattern(pattern));
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else if (type == RT_NUMBER)
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printf("NUMBER %s\n", READ_get_pattern(pattern));
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else if (type == RT_IDENTIFIER)
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printf("IDENTIFIER %s\n", READ_get_pattern(pattern));
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else if (type == RT_CLASS)
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printf("CLASS %s\n", READ_get_pattern(pattern));
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else if (type == RT_STRING)
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printf("STRING %s\n", READ_get_pattern(pattern));
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else if (type == RT_TSTRING)
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printf("TSTRING %s\n", READ_get_pattern(pattern));
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else if (type == RT_NEWLINE)
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printf("NEWLINE (%d)\n", index);
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else if (type == RT_END)
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printf("END\n");
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else if (type == RT_PARAM)
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printf("PARAM %d\n", index);
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else if (type == RT_SUBR)
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printf("SUBR %s\n", READ_get_pattern(pattern));
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else if (type == RT_COMMENT)
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printf("COMMENT %s\n", READ_get_pattern(pattern));
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else if (type == RT_SPACE)
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printf("SPACE %s\n", READ_get_pattern(pattern));
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else
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printf("? %d\n", index);
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_no_quote = FALSE;
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}
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#endif
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#define get_char_offset(_offset) ((unsigned char)source_ptr[(_offset)])
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#define get_char() ((unsigned char)(*source_ptr))
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static unsigned char next_char(void)
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{
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source_ptr++;
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return get_char();
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}
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#ifdef DEBUG
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static void add_pattern(int type, int index)
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{
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EVAL->pattern[EVAL->pattern_count++] = PATTERN_make(type, index);
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READ_dump_pattern(&EVAL->pattern[EVAL->pattern_count - 1]);
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}
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#else
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#define add_pattern(_type, _index) EVAL->pattern[EVAL->pattern_count++] = PATTERN_make((_type), (_index));
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#endif
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static PATTERN get_previous_pattern(int n)
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{
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int i;
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PATTERN pattern;
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for (i = EVAL->pattern_count - 1; i >= 0; i--)
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{
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pattern = EVAL->pattern[i];
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if (!PATTERN_is_space(pattern))
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{
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n--;
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if (n == 0)
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return pattern;
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}
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}
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return NULL_PATTERN;
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}
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#define get_last_pattern() get_previous_pattern(1)
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#define get_last_last_pattern() get_previous_pattern(2)
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static void add_newline()
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{
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add_pattern(RT_NEWLINE, 0);
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}
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static void add_end()
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{
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add_pattern(RT_END, 0);
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}
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#include "gbc_read_temp.h"
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static void add_quoted_identifier(void)
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{
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unsigned char car;
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const char *start;
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int len;
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int index;
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int type;
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PATTERN last_pattern;
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last_pattern = get_last_pattern();
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type = RT_IDENTIFIER;
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start = source_ptr;
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len = 1;
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for(;;)
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{
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source_ptr++;
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car = get_char();
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len++;
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if (!ident_car[car])
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break;
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}
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source_ptr++;
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if (!EVAL->analyze)
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{
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if (car != '}')
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THROW("Missing '}'");
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if (len == 2)
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THROW("Void identifier");
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}
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else
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{
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if (!car)
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len--;
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if (car != '}' || len <= 2)
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type = RT_ERROR;
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}
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if (!EVAL->analyze && PATTERN_is(last_pattern, RS_EXCL))
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{
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index = TABLE_add_symbol(EVAL->string, start + 1, len - 2);
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type = RT_STRING;
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}
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else
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{
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if (!EVAL->rewrite && type != RT_ERROR)
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{
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start++;
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len -= 2;
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}
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index = TABLE_add_symbol(type == RT_ERROR ? EVAL->string : EVAL->table, start, len);
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}
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add_pattern(type, index);
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}
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static void add_operator()
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{
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unsigned char car;
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const char *start;
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const char *end;
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int len;
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int op = NO_SYMBOL;
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int index;
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start = source_ptr;
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end = start;
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len = 1;
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for(;;)
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{
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source_ptr++;
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index = RESERVED_find_word(start, len);
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if (index >= 0)
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{
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op = index;
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end = source_ptr;
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}
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car = get_char();
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//if (!isascii(car) || !ispunct(car))
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if (noop_car[car])
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break;
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len++;
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}
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source_ptr = end;
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if (EVAL->analyze && op == RS_QUES)
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op = RS_PRINT;
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if (op < 0)
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THROW("Unknown operator");
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add_pattern(RT_RESERVED, op);
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}
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static int xdigit_val(unsigned char c)
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{
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if (c >= '0' && c <= '9')
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return (c - '0');
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else if (c >= 'a' && c <= 'f')
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return (c - 'a' + 10);
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else if (c >= 'A' && c <= 'F')
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return (c - 'A' + 10);
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else
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return (-1);
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}
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static void add_string()
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{
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unsigned char car;
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const char *start;
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int len;
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int index;
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ushort newline;
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bool jump;
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char *p;
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int i;
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start = source_ptr;
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len = 0;
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newline = 0;
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jump = FALSE;
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p = (char *)source_ptr;
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//fprintf(stderr, "EVAL_read: add_string: [%d] %s\n", source_ptr - EVAL->source, source_ptr);
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for(;;)
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{
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source_ptr++;
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car = get_char();
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//fprintf(stderr, "EVAL_read: car = %d jump = %d\n", car, jump);
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if (jump)
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{
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if (car == '\n')
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newline++;
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else if (car == '"')
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jump = FALSE;
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else if (!car || !isspace(car))
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break;
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}
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else
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{
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p++;
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len++;
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if (!car || car == '\n')
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THROW("Non terminated string");
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if (car == '\\')
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{
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source_ptr++;
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car = get_char();
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if (car == 'n')
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*p = '\n';
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else if (car == 't')
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*p = '\t';
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else if (car == 'r')
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*p = '\r';
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else if (car == 'b')
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*p = '\b';
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else if (car == 'v')
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*p = '\v';
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else if (car == 'f')
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*p = '\f';
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else if (car == 'e')
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*p = '\x1B';
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else if (car == '0')
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*p = 0;
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else if (car == '\"' || car == '\'' || car == '\\')
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*p = car;
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else
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{
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if (car == 'x')
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{
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i = xdigit_val(get_char_offset(1));
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if (i >= 0)
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{
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car = i;
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i = xdigit_val(get_char_offset(2));
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if (i >= 0)
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{
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car = (car << 4) | (uchar)i;
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*p = car;
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source_ptr += 2;
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continue;
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}
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}
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}
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THROW("Bad character constant in string");
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}
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}
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else if (car == '"')
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{
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p--;
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len--;
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jump = TRUE;
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}
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else
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*p = car;
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}
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}
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p[1] = 0;
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//fprintf(stderr, "EVAL_read: add_string (end): [%d] %s\n", source_ptr - EVAL->source, source_ptr);
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if (len > 0)
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{
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index = TABLE_add_symbol(EVAL->string, start + 1, len);
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add_pattern(RT_STRING, index);
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}
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else
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add_pattern(RT_STRING, VOID_STRING_INDEX);
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for (i = 0; i < newline; i++)
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add_newline();
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source_ptr -= newline;
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}
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static void add_comment()
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{
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unsigned char car;
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const char *start;
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int len;
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int index;
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int type;
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start = source_ptr;
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len = 1;
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for(;;)
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{
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source_ptr++;
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car = get_char();
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if (car == 0 || car == '\n')
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break;
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len++;
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}
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index = TABLE_add_symbol(EVAL->string, start, len);
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type = RT_COMMENT;
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add_pattern(type, index);
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}
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static void add_string_for_analyze()
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{
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unsigned char car;
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const char *start;
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int len;
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int index;
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int type;
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start = source_ptr;
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len = 0;
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for(;;)
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{
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source_ptr++;
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car = get_char();
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if (car == '\\')
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{
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source_ptr++;
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car = get_char();
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len++;
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if (car == 0)
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break;
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}
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else if (car == 0 || car == '\n' || car == '"')
|
|
break;
|
|
len++;
|
|
}
|
|
|
|
if (car == '"')
|
|
source_ptr++;
|
|
|
|
index = TABLE_add_symbol(EVAL->string, start + 1, len);
|
|
type = RT_STRING;
|
|
|
|
add_pattern(type, index);
|
|
//fprintf(stderr, "add_string_for_analyze: %s\n", TABLE_get_symbol_name(EVAL->string, index));
|
|
}
|
|
|
|
|
|
static void add_spaces()
|
|
{
|
|
unsigned char car;
|
|
int len;
|
|
|
|
len = 1;
|
|
|
|
for(;;)
|
|
{
|
|
source_ptr++;
|
|
car = get_char();
|
|
if (car > ' ' || car == '\n' || car == 0)
|
|
break;
|
|
len++;
|
|
}
|
|
|
|
add_pattern(RT_SPACE, len);
|
|
}
|
|
|
|
|
|
void EVAL_read(void)
|
|
{
|
|
static const void *jump_char[12] =
|
|
{
|
|
&&__BREAK,
|
|
&&__SPACE,
|
|
&&__NEWLINE,
|
|
&&__COMMENT,
|
|
&&__STRING,
|
|
&&__IDENT,
|
|
&&__QUOTED_IDENT,
|
|
&&__ERROR,
|
|
&&__SHARP,
|
|
&&__NUMBER,
|
|
&&__NUMBER_OR_OPERATOR,
|
|
&&__OPERATOR
|
|
};
|
|
|
|
unsigned char car;
|
|
|
|
READ_init();
|
|
|
|
source_ptr = EVAL->source;
|
|
_begin_line = TRUE;
|
|
|
|
for(;;)
|
|
{
|
|
car = get_char();
|
|
goto *jump_char[(int)first_car[car]];
|
|
|
|
__ERROR:
|
|
|
|
THROW(E_SYNTAX);
|
|
|
|
__SPACE:
|
|
|
|
if (EVAL->analyze)
|
|
add_spaces();
|
|
else
|
|
source_ptr++;
|
|
|
|
continue;
|
|
|
|
__NEWLINE:
|
|
|
|
source_ptr++;
|
|
add_newline();
|
|
_begin_line = TRUE;
|
|
continue;
|
|
|
|
__COMMENT:
|
|
|
|
if (EVAL->analyze)
|
|
{
|
|
add_comment();
|
|
}
|
|
else
|
|
{
|
|
do
|
|
{
|
|
source_ptr++;
|
|
car = get_char();
|
|
}
|
|
while (car != '\n' && car != 0);
|
|
}
|
|
|
|
_begin_line = FALSE;
|
|
continue;
|
|
|
|
__STRING:
|
|
|
|
if (EVAL->analyze)
|
|
add_string_for_analyze();
|
|
else
|
|
add_string();
|
|
_begin_line = FALSE;
|
|
continue;
|
|
|
|
__IDENT:
|
|
|
|
add_identifier();
|
|
_begin_line = FALSE;
|
|
continue;
|
|
|
|
__QUOTED_IDENT:
|
|
|
|
add_quoted_identifier();
|
|
_begin_line = FALSE;
|
|
continue;
|
|
|
|
__SHARP:
|
|
|
|
if (_begin_line)
|
|
{
|
|
_begin_line = FALSE;
|
|
if (get_char_offset(1) == '!' && EVAL->analyze)
|
|
add_comment();
|
|
else
|
|
add_identifier();
|
|
continue;
|
|
}
|
|
|
|
__NUMBER_OR_OPERATOR:
|
|
|
|
if (add_number())
|
|
goto __OPERATOR;
|
|
|
|
_begin_line = FALSE;
|
|
continue;
|
|
|
|
__NUMBER:
|
|
|
|
add_number();
|
|
_begin_line = FALSE;
|
|
continue;
|
|
|
|
__OPERATOR:
|
|
|
|
add_operator();
|
|
_begin_line = FALSE;
|
|
continue;
|
|
}
|
|
|
|
__BREAK:
|
|
|
|
// We add end markers to simplify the compiler job, when it needs to look
|
|
// at many patterns in one shot.
|
|
|
|
add_end();
|
|
add_end();
|
|
add_end();
|
|
add_end();
|
|
}
|
|
|