354 lines
6.6 KiB
C
354 lines
6.6 KiB
C
/*
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* $Id: run.c,v 1.13 2006-03-22 16:05:49 bacon Exp $
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*/
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#include <xp/awk/awk.h>
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#ifndef __STAND_ALONE
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#include <xp/bas/assert.h>
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#include <xp/bas/string.h>
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#include <xp/bas/memory.h>
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#endif
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static int __activate_block (xp_awk_t* awk, xp_awk_nde_blk_t* nde);
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static int __run_block (xp_awk_t* awk, xp_awk_nde_blk_t* nde);
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static int __run_statement (xp_awk_t* awk, xp_awk_nde_t* nde);
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static int __run_if_statement (xp_awk_t* awk, xp_awk_nde_if_t* nde);
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static xp_awk_val_t* __eval_expression (xp_awk_t* awk, xp_awk_nde_t* nde);
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static xp_awk_val_t* __eval_assignment (xp_awk_t* awk, xp_awk_nde_ass_t* nde);
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static xp_awk_val_t* __eval_binary (xp_awk_t* awk, xp_awk_nde_exp_t* nde);
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static void __refup (xp_awk_val_t* val);
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static void __refdown (xp_awk_val_t* val);
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int __printval (xp_awk_pair_t* pair)
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{
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xp_printf (XP_TEXT("%s = "), (const xp_char_t*)pair->key);
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xp_awk_printval ((xp_awk_val_t*)pair->val);
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xp_printf (XP_TEXT("\n"));
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return 0;
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}
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int xp_awk_run (xp_awk_t* awk)
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{
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if (awk->tree.begin != XP_NULL)
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{
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xp_assert (awk->tree.begin->type == XP_AWK_NDE_BLK);
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if (__run_block (awk,
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(xp_awk_nde_blk_t*)awk->tree.begin) == -1) return -1;
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}
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if (awk->tree.end != XP_NULL)
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{
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xp_assert (awk->tree.end->type == XP_AWK_NDE_BLK);
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if (__run_block (awk,
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(xp_awk_nde_blk_t*)awk->tree.end) == -1) return -1;
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}
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xp_printf (XP_TEXT("---------------------------\n"));
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xp_awk_map_walk (&awk->run.named, __printval);
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return 0;
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}
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static int __activate_block (xp_awk_t* awk, xp_awk_nde_blk_t* nde)
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{
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/*
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if (nde->nlocals == 0 && awk->run.top_frame != XP_NULL) {
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}
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*/
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return -1;
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}
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static int __run_block (xp_awk_t* awk, xp_awk_nde_blk_t* nde)
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{
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xp_awk_nde_t* p;
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xp_assert (nde->type == XP_AWK_NDE_BLK);
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p = nde->body;
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while (p != XP_NULL)
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{
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if (__run_statement(awk,p) == -1) return -1;
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p = p->next;
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}
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return 0;
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}
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static int __run_statement (xp_awk_t* awk, xp_awk_nde_t* nde)
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{
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switch (nde->type)
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{
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case XP_AWK_NDE_NULL:
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/* do nothing */
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break;
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case XP_AWK_NDE_BLK:
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if (__run_block(awk,(xp_awk_nde_blk_t*)nde) == -1) return -1;
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break;
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case XP_AWK_NDE_IF:
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if (__run_if_statement(awk,(xp_awk_nde_if_t*)nde) == -1) return -1;
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break;
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case XP_AWK_NDE_WHILE:
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break;
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case XP_AWK_NDE_DOWHILE:
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break;
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case XP_AWK_NDE_FOR:
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break;
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case XP_AWK_NDE_BREAK:
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break;
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case XP_AWK_NDE_CONTINUE:
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break;
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case XP_AWK_NDE_RETURN:
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break;
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case XP_AWK_NDE_EXIT:
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break;
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case XP_AWK_NDE_NEXT:
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break;
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case XP_AWK_NDE_NEXTFILE:
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break;
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default:
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if (__eval_expression(awk,nde) == XP_NULL) return -1;
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break;
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}
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return 0;
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}
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static int __run_if_statement (xp_awk_t* awk, xp_awk_nde_if_t* nde)
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{
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xp_awk_val_t* test;
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int n;
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test = __eval_expression (awk, nde->test);
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if (xp_awk_isvaltrue(test))
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{
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n = __run_statement (awk, nde->then_part);
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}
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else if (nde->else_part != XP_NULL)
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{
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n = __run_statement (awk, nde->else_part);
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}
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xp_awk_freeval (test); // TODO: is this correct?
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return n;
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}
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static xp_awk_val_t* __eval_expression (xp_awk_t* awk, xp_awk_nde_t* nde)
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{
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xp_awk_val_t* val;
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switch (nde->type)
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{
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case XP_AWK_NDE_ASS:
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val = __eval_assignment(awk,(xp_awk_nde_ass_t*)nde);
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break;
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case XP_AWK_NDE_EXP_BIN:
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val = __eval_binary(awk,(xp_awk_nde_exp_t*)nde);
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break;
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case XP_AWK_NDE_EXP_UNR:
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// TODO: .......................
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break;
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case XP_AWK_NDE_STR:
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val = xp_awk_makestrval(
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((xp_awk_nde_str_t*)nde)->buf,
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((xp_awk_nde_str_t*)nde)->len);
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break;
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case XP_AWK_NDE_INT:
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val = xp_awk_makeintval(((xp_awk_nde_int_t*)nde)->val);
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break;
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/* TODO:
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case XP_AWK_NDE_REAL:
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val = xp_awk_makerealval(((xp_awk_nde_real_t*)nde)->val);
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break;
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*/
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case XP_AWK_NDE_ARG:
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case XP_AWK_NDE_ARGIDX:
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case XP_AWK_NDE_NAMED:
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{
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xp_awk_nde_var_t* tgt = (xp_awk_nde_var_t*)nde;
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xp_awk_pair_t* pair;
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pair = xp_awk_map_get(&awk->run.named,tgt->id.name);
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if (pair == XP_NULL) val = xp_awk_val_nil;
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else val = xp_awk_cloneval (pair->val);
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}
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break;
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case XP_AWK_NDE_NAMEDIDX:
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case XP_AWK_NDE_GLOBAL:
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case XP_AWK_NDE_GLOBALIDX:
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case XP_AWK_NDE_LOCAL:
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case XP_AWK_NDE_LOCALIDX:
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case XP_AWK_NDE_POS:
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case XP_AWK_NDE_CALL:
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break;
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default:
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/* somthing wrong */
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return XP_NULL;
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}
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return val;
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}
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static xp_awk_val_t* __eval_assignment (xp_awk_t* awk, xp_awk_nde_ass_t* nde)
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{
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xp_awk_val_t* v;
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xp_awk_nde_var_t* tgt;
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tgt = (xp_awk_nde_var_t*)nde->left;
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if (tgt->type == XP_AWK_NDE_NAMED)
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{
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/* xp_awk_val_t* old, * new; */
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xp_awk_pair_t* pair;
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xp_awk_val_t* new;
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xp_char_t* name;
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new = __eval_expression(awk, nde->right);
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xp_assert (tgt != XP_NULL);
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if (new == XP_NULL) return XP_NULL;
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pair = xp_awk_map_get(&awk->run.named, tgt->id.name);
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if (pair == XP_NULL)
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{
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name = xp_strdup (tgt->id.name);
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if (name == XP_NULL)
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{
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xp_awk_freeval(new);
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awk->errnum = XP_AWK_ENOMEM;
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return XP_NULL;
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}
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}
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else name = pair->key;
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if (xp_awk_map_put(&awk->run.named, name, new) == XP_NULL)
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{
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xp_free (name);
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xp_awk_freeval (new);
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awk->errnum = XP_AWK_ENOMEM;
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return XP_NULL;
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}
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__refup (new);
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v = new;
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}
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else if (tgt->type == XP_AWK_NDE_GLOBAL)
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{
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}
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else if (tgt->type == XP_AWK_NDE_LOCAL)
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{
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}
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else if (tgt->type == XP_AWK_NDE_ARG)
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{
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}
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else if (tgt->type == XP_AWK_NDE_NAMEDIDX)
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{
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}
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else if (tgt->type == XP_AWK_NDE_GLOBALIDX)
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{
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}
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else if (tgt->type == XP_AWK_NDE_LOCALIDX)
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{
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}
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else if (tgt->type == XP_AWK_NDE_ARGIDX)
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{
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}
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else
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{
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/* this should never be reached. something wrong */
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// TODO: set errnum ....
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return XP_NULL;
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}
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return v;
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}
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static xp_awk_val_t* __eval_binary (xp_awk_t* awk, xp_awk_nde_exp_t* nde)
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{
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xp_awk_val_t* left, * right, * res;
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xp_assert (nde->type == XP_AWK_NDE_EXP_BIN);
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left = __eval_expression (awk, nde->left);
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if (left == XP_NULL) return XP_NULL;
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right = __eval_expression (awk, nde->right);
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if (right == XP_NULL)
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{
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xp_awk_freeval (left);
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return XP_NULL;
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}
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res = XP_NULL;
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// TODO: a lot of things to do....
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if (nde->opcode == XP_AWK_BINOP_PLUS)
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{
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if (left->type == XP_AWK_VAL_INT &&
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right->type == XP_AWK_VAL_INT)
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{
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xp_long_t r =
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((xp_awk_val_int_t*)left)->val +
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((xp_awk_val_int_t*)right)->val;
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res = xp_awk_makeintval (r);
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}
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}
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else if (nde->opcode == XP_AWK_BINOP_MINUS)
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{
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if (left->type == XP_AWK_VAL_INT &&
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right->type == XP_AWK_VAL_INT)
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{
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xp_long_t r =
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((xp_awk_val_int_t*)left)->val -
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((xp_awk_val_int_t*)right)->val;
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res = xp_awk_makeintval (r);
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}
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}
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xp_awk_freeval(left);
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xp_awk_freeval(right);
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return res;
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}
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static void __refup (xp_awk_val_t* val)
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{
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val->ref++;
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}
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static void __refdown (xp_awk_val_t* val)
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{
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xp_assert (val->ref > 0);
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val->ref--;
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if (val->ref <= 0) xp_awk_freeval(val);
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}
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