697 lines
13 KiB
C
697 lines
13 KiB
C
/***************************************************************************
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trans_tree.c
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Convert expression to a tree
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(c) 2000-2007 Benoit Minisini <gambas@users.sourceforge.net>
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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 1, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
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***************************************************************************/
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#define __TRANS_TREE_C
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#include "gb_common.h"
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#include "gb_error.h"
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#include "gb_reserved.h"
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#include "eval_trans.h"
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#include "eval_read.h"
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#include "eval.h"
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/*#define DEBUG*/
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static short level;
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static PATTERN *current;
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/*PRIVATE PATTERN last_pattern;*/
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static void analyze_expr(short priority, short op_main);
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static void inc_level()
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{
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level++;
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if (level > MAX_EXPR_LEVEL)
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THROW("Expression too complex");
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}
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static void dec_level()
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{
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level--;
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}
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static void add_pattern(PATTERN pattern)
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{
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PATTERN *node;
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short index;
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index = (short)ARRAY_count(EVAL->tree);
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if (index >= MAX_EXPR_PATTERN)
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THROW("Expression too complex");
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node = ARRAY_add(&EVAL->tree);
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*node = pattern;
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/*last_pattern = pattern;*/
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/*#ifdef DEBUG
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READ_dump_pattern(&pattern);
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#endif*/
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}
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static void remove_last_pattern()
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{
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if (!ARRAY_count(EVAL->tree))
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return;
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ARRAY_remove_last(&EVAL->tree);
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}
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static PATTERN get_last_pattern(int dep)
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{
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short index;
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index = (short)ARRAY_count(EVAL->tree);
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if (index < dep)
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return NULL_PATTERN;
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return EVAL->tree[index - dep];
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}
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static void change_last_pattern(int dep, PATTERN pattern)
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{
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short index;
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index = (short)ARRAY_count(EVAL->tree);
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if (index < dep)
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return;
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EVAL->tree[index - dep] = pattern;
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}
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static void check_last_first(int dep)
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{
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if (PATTERN_is_identifier(get_last_pattern(dep)))
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change_last_pattern(dep, PATTERN_set_flag(get_last_pattern(dep), RT_FIRST));
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}
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static void add_reserved_pattern(int reserved)
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{
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add_pattern(PATTERN_make(RT_RESERVED, reserved));
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}
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static void add_operator_output(short op, short nparam, boolean has_output)
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{
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PATTERN pattern;
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/*
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Why this test?
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add_operator() can be called without operator. See:
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if (RES_priority(op) < prio) ...
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*/
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if (op == RS_NONE || op == RS_UNARY)
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return;
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if (op == RS_EXCL)
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{
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op = RS_LSQR;
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nparam = 2;
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check_last_first(2);
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}
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pattern = PATTERN_make(RT_RESERVED, op);
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if (op == RS_LBRA && has_output)
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pattern = PATTERN_set_flag(pattern, RT_OUTPUT);
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add_pattern(pattern);
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pattern = PATTERN_make(RT_PARAM, nparam);
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add_pattern(pattern);
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}
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static void add_operator(short op, short nparam)
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{
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add_operator_output(op, nparam, FALSE);
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}
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static void add_subr(PATTERN subr_pattern, short nparam, boolean has_output)
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{
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PATTERN pattern;
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if (has_output)
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subr_pattern = PATTERN_set_flag(subr_pattern, RT_OUTPUT);
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add_pattern(subr_pattern);
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pattern = PATTERN_make(RT_PARAM, nparam);
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add_pattern(pattern);
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}
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static void analyze_make_array()
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{
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int n = 0;
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if (PATTERN_is(*current, RS_RSQR))
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{
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current++;
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add_pattern(PATTERN_make(RT_RESERVED, RS_NULL));
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return;
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}
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for(;;)
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{
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n++;
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if (n > MAX_PARAM_OP)
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THROW("Too many arguments");
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analyze_expr(0, RS_NONE);
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if (!PATTERN_is(*current, RS_COMMA))
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break;
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current++;
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}
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if (!PATTERN_is(*current, RS_RSQR))
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THROW("Missing ']'");
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current++;
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add_operator(RS_RSQR, n);
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}
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static void analyze_single(int op)
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{
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PATTERN *pattern;
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if (PATTERN_is_newline(*current))
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current++;
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if (op == RS_PT && !PATTERN_is_identifier(*current))
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THROW("The '.' operator must be followed by an identifier");
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else if (op == RS_EXCL && !PATTERN_is_string(*current))
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THROW("The '!' operator must be followed by an identifier");
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/* ( expr ) */
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if (PATTERN_is(*current, RS_LBRA))
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{
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int index = ARRAY_count(EVAL->tree);
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PATTERN last;
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current++;
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analyze_expr(0, RS_NONE);
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if (!PATTERN_is(*current, RS_RBRA))
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THROW("Missing ')'");
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current++;
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if (ARRAY_count(EVAL->tree) == (index + 1))
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{
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last = get_last_pattern(1);
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if (PATTERN_is_string(last))
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change_last_pattern(1, PATTERN_make(RT_TSTRING, PATTERN_index(last)));
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}
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}
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/* [ expr, expr, ... ] */
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else if (PATTERN_is(*current, RS_LSQR))
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{
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current++;
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analyze_make_array();
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}
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/* - expr | NOT expr */
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else if (PATTERN_is(*current, RS_MINUS) || PATTERN_is(*current, RS_NOT))
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{
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pattern = current;
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current++;
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analyze_expr(RES_priority(RS_NOT), RS_UNARY);
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add_operator(PATTERN_index(*pattern), 1);
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}
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/* . symbol
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else if (PATTERN_is(*current, RS_PT) && PATTERN_is_identifier(current[1]))
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{
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add_operator(PATTERN_index(current[0]), 0);
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add_pattern(PATTERN_set_flag(current[1], RT_POINT));
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current += 2;
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}*/
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/* NULL, TRUE, FALSE, ME, LAST */
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/* nombre, chaine ou symbole */
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else if (PATTERN_is(*current, RS_NULL)
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|| PATTERN_is(*current, RS_ME)
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|| PATTERN_is(*current, RS_LAST)
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|| PATTERN_is(*current, RS_TRUE)
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|| PATTERN_is(*current, RS_FALSE)
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|| PATTERN_is(*current, RS_ERROR)
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|| (!PATTERN_is_reserved(*current) && !PATTERN_is_newline(*current) && !PATTERN_is_end(*current)))
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{
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add_pattern(*current);
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if (PATTERN_is_identifier(*current))
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{
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/*if ((op == RS_NONE || op == RS_UNARY) && (PATTERN_is_identifier(*current)))
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change_last_pattern(1, PATTERN_set_flag(get_last_pattern(1), RT_FIRST));*/
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if (op == RS_PT)
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{
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change_last_pattern(1, PATTERN_set_flag(get_last_pattern(1), RT_POINT));
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check_last_first(2);
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}
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}
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current++;
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}
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else
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THROW2("Unexpected &1", READ_get_pattern(current));
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}
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static void analyze_call()
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{
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/*static PATTERN *output[MAX_PARAM_OP];*/
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int nparam_post = 0;
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PATTERN subr_pattern = NULL_PATTERN;
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PATTERN last_pattern = get_last_pattern(1);
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boolean has_output = FALSE;
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/*int i;
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PATTERN *save_current;*/
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SUBR_INFO *info;
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boolean optional = TRUE;
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/*
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get_pattern_subr(last_pattern, &subr);
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*/
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if (PATTERN_is_subr(last_pattern))
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{
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subr_pattern = last_pattern;
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remove_last_pattern();
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optional = FALSE;
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}
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else if (PATTERN_is_identifier(last_pattern))
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{
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check_last_first(1);
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}
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else if (PATTERN_is_string(last_pattern) || PATTERN_is_number(last_pattern))
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THROW(E_SYNTAX);
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/* N.B. Le cas o last_pattern = "." n'a pas de test sp<73>ifique */
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for (;;)
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{
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if (PATTERN_is(*current, RS_RBRA))
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{
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current++;
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break;
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}
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if (nparam_post > 0)
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{
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if (!PATTERN_is(*current, RS_COMMA))
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THROW("Missing ')'");
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current++;
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}
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#if 0
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if (FALSE) /*(PATTERN_is(*current, RS_AMP))*/
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{
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current++;
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output[nparam_post] = current;
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has_output = TRUE;
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}
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else
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{
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output[nparam_post] = NULL;
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}
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#endif
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if (optional && (PATTERN_is(*current, RS_COMMA) || PATTERN_is(*current, RS_RBRA)))
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{
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add_reserved_pattern(RS_OPTIONAL);
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}
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else
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{
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analyze_expr(0, RS_NONE);
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}
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nparam_post++;
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if (nparam_post > MAX_PARAM_FUNC)
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THROW("Too many arguments");
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}
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if (get_last_pattern(1) == PATTERN_make(RT_RESERVED, RS_OPTIONAL))
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THROW("Syntax error. Needless arguments");
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/*
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while (nparam_post > 0)
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{
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if (get_last_pattern(1) != PATTERN_make(RT_RESERVED, RS_OPTIONAL))
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break;
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remove_last_pattern();
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nparam_post--;
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}
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*/
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if (subr_pattern == NULL_PATTERN)
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add_operator_output(RS_LBRA, nparam_post, has_output);
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else
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{
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info = &COMP_subr_info[PATTERN_index(subr_pattern)];
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if (nparam_post < info->min_param)
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THROW2("Not enough arguments to &1", info->name);
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else if (nparam_post > info->max_param)
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THROW2("Too many arguments to &1", info->name);
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add_subr(subr_pattern, nparam_post, has_output);
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}
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#if 0
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if (has_output)
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{
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save_current = current;
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for (i = nparam_post - 1; i >= 0; i--)
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{
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if (output[i] != NULL)
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{
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current = output[i];
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analyze_expr(0, RS_NONE);
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add_reserved_pattern(RS_AT);
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}
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else
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add_reserved_pattern(RS_COMMA); /* Provoque un drop */
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}
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if (subr_pattern != NULL_PATTERN)
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add_reserved_pattern(RS_RBRA); /* Provoque le PUSH RETURN dans le cas d'un call*/
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current = save_current;
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}
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#endif
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}
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static void analyze_array()
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{
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int i;
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check_last_first(1);
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for(i = 0; i < MAX_ARRAY_DIM; i++)
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{
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analyze_expr(0, RS_NONE);
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if (!PATTERN_is(*current, RS_COMMA))
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break;
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current++;
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}
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if (!PATTERN_is(*current, RS_RSQR))
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THROW("Missing ']'");
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current++;
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add_operator(RS_LSQR, i + 2);
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}
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#if 0
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static void analyze_expr_check_first(int op_curr)
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{
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/* On laisse le marqueur RT_FIRST que si on a affaire <20>l'op<6F>ateur '.' */
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/*
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last = get_last_pattern();
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if (PATTERN_is_first(last))
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{
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if (op_curr != RS_PT)
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change_last_pattern(PATTERN_unset_flag(last, RT_FIRST));
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}
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*/
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}
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#endif
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static void analyze_expr(short priority, short op_main)
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{
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int op_curr;
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int op;
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int prio;
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int nparam;
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inc_level();
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op_curr = op_main;
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nparam = (op_main == RS_NONE || op_main == RS_UNARY) ? 0 : 1;
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/* cas particulier de NEW */
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/* obsol<6F>e : ne doit jamais servir, l'analyse est faite ailleurs */
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if (PATTERN_is(*current, RS_NEW))
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THROW("Cannot use NEW operator there");
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/* analyse des op<6F>andes */
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READ_OPERAND:
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//analyze_expr_check_first(op_curr);
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analyze_single(op_curr);
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nparam++;
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if (nparam > MAX_PARAM_OP)
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THROW("Expression too complex. Too many operands");
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/* Lecture de l'op<6F>ateur */
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READ_OPERATOR:
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if (!PATTERN_is_reserved(*current))
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goto OPERATOR_END;
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op = PATTERN_index(*current);
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if (!RES_is_operator(op))
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goto OPERATOR_END;
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current++;
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if (priority)
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prio = priority;
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else if (op_curr == RS_NONE)
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prio = 0;
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else
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prio = RES_priority(op_curr);
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if (op_curr == RS_NONE)
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{
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if (RES_is_binary(op) || RES_is_n_ary(op))
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{
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op_curr = op;
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goto READ_OPERAND;
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}
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}
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if (op_curr == op)
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{
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if (!(RES_is_binary(op) && nparam == 2))
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goto READ_OPERAND;
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}
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|
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if (RES_priority(op) > prio)
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{
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if (op == RS_LSQR)
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analyze_array();
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else if (op == RS_LBRA)
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analyze_call();
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else
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analyze_expr(RES_priority(op), op);
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goto READ_OPERATOR;
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}
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|
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if (RES_priority(op) == prio)
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{
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add_operator(op_curr, nparam);
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|
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if (op == RS_LSQR)
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{
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analyze_array();
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goto READ_OPERATOR;
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}
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else if (op == RS_LBRA)
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{
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analyze_call();
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goto READ_OPERATOR;
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}
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else
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{
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if (RES_is_only(op_curr) || RES_is_only(op))
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THROW("Ambiguous expression. Please use braces");
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nparam = 1;
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op_curr = op;
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goto READ_OPERAND;
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}
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}
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|
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if (RES_priority(op) < prio)
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{
|
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if ((op_main != RS_NONE) || (priority > 0))
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{
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add_operator(op_curr, nparam);
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current--;
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goto END;
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}
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add_operator(op_curr, nparam);
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|
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if (op == RS_LSQR)
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{
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analyze_array();
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nparam = 1;
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op_curr = op_main;
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goto READ_OPERATOR;
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}
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else if (op == RS_LBRA)
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{
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analyze_call();
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nparam = 1;
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op_curr = op_main;
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goto READ_OPERATOR;
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}
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else
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{
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nparam = 1;
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op_curr = op;
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goto READ_OPERAND;
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}
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}
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dec_level();
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return;
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OPERATOR_END:
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//analyze_expr_check_first(op_curr);
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add_operator(op_curr, nparam);
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END:
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|
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dec_level();
|
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return;
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}
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|
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|
||
PUBLIC void TRANS_tree()
|
||
{
|
||
#ifdef DEBUG
|
||
int i;
|
||
#endif
|
||
|
||
/*last_pattern = NULL_PATTERN;*/
|
||
|
||
ARRAY_create(&EVAL->tree);
|
||
/*ARRAY_add(&tree);*/
|
||
|
||
current = EVAL->pattern;
|
||
|
||
if (PATTERN_is_newline(*current) || PATTERN_is_end(*current))
|
||
THROW(E_SYNTAX);
|
||
|
||
analyze_expr(0, RS_NONE);
|
||
|
||
while (PATTERN_is_newline(*current))
|
||
current++;
|
||
|
||
if (!PATTERN_is_end(*current))
|
||
THROW(E_SYNTAX);
|
||
|
||
#ifdef DEBUG
|
||
printf("\n");
|
||
for (i = 0; i < ARRAY_count(EVAL->tree); i++)
|
||
READ_dump_pattern(&EVAL->tree[i]);
|
||
#endif
|
||
}
|
||
|
||
|
||
#if 0
|
||
PUBLIC boolean TRANS_is_statement(TRANS_TREE *tree)
|
||
{
|
||
PATTERN last;
|
||
int count;
|
||
|
||
count = ARRAY_count(tree);
|
||
|
||
if (count == 0)
|
||
return FALSE;
|
||
|
||
count--;
|
||
last = tree[count];
|
||
|
||
if (PATTERN_is_param(last) && (count > 0))
|
||
{
|
||
count--;
|
||
last = tree[count];
|
||
}
|
||
|
||
if (PATTERN_is(last, RS_PT) || (PATTERN_is_identifier(last) && count == 0))
|
||
{
|
||
add_operator(RS_LBRA, 0);
|
||
return TRUE;
|
||
}
|
||
|
||
if (PATTERN_is_subr(last)
|
||
|| PATTERN_is(last, RS_LBRA)
|
||
|| PATTERN_is(last, RS_RBRA)
|
||
|| PATTERN_is(last, RS_AT)
|
||
|| PATTERN_is(last, RS_COMMA))
|
||
return TRUE;
|
||
|
||
#ifdef DEBUG
|
||
printf("Last = ");
|
||
READ_dump_pattern(&last);
|
||
#endif
|
||
|
||
return FALSE;
|
||
|
||
}
|
||
#endif
|
||
|