822 lines
17 KiB
C
822 lines
17 KiB
C
/*
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* $Id: parse.c,v 1.13 2006-01-11 11:52:17 bacon Exp $
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*/
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#include <xp/awk/awk.h>
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#include <xp/awk/tree.h>
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#include <xp/awk/tree.h>
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#include <xp/bas/memory.h>
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#include <xp/bas/ctype.h>
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#include <xp/bas/string.h>
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#include <xp/bas/assert.h>
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enum
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{
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TOKEN_EOF,
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TOKEN_ASSIGN,
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TOKEN_EQ,
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TOKEN_NE,
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TOKEN_NOT,
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TOKEN_PLUS,
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TOKEN_PLUS_PLUS,
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TOKEN_PLUS_ASSIGN,
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TOKEN_MINUS,
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TOKEN_MINUS_MINUS,
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TOKEN_MINUS_ASSIGN,
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TOKEN_MUL,
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TOKEN_DIV,
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TOKEN_MOD,
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TOKEN_LPAREN,
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TOKEN_RPAREN,
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TOKEN_LBRACE,
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TOKEN_RBRACE,
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TOKEN_LBRACKET,
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TOKEN_RBRACKET,
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TOKEN_SEMICOLON,
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TOKEN_STRING,
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TOKEN_REGEX,
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TOKEN_IDENT,
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TOKEN_BEGIN,
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TOKEN_END,
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TOKEN_FUNCTION,
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TOKEN_IF,
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TOKEN_WHILE,
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TOKEN_FOR,
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TOKEN_DO,
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TOKEN_BREAK,
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TOKEN_CONTINUE,
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TOKEN_RETURN,
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TOKEN_EXIT,
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TOKEN_DELETE,
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TOKEN_NEXT,
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TOKEN_NEXTFILE
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};
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static xp_awk_node_t* __parse_program (xp_awk_t* awk);
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static xp_awk_node_t* __parse_funcdcl (xp_awk_t* awk);
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static xp_awk_node_t* __parse_patnact (xp_awk_t* awk);
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static xp_awk_node_t* __parse_block (xp_awk_t* awk);
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static xp_awk_node_t* __parse_stat (xp_awk_t* awk);
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static xp_awk_node_t* __parse_expr (xp_awk_t* awk);
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static xp_awk_node_t* __parse_assignment (xp_awk_t* awk, const xp_char_t* ident);
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static xp_awk_node_t* __parse_basic_expr (xp_awk_t* awk, const xp_char_t* ident);
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static xp_awk_node_t* __parse_additive (xp_awk_t* awk);
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static xp_awk_node_t* __parse_multiplicative (xp_awk_t* awk);
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static xp_awk_node_t* __parse_unary (xp_awk_t* awk);
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static xp_awk_node_t* __parse_primary (xp_awk_t* awk);
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static xp_awk_node_t* __parse_if (xp_awk_t* awk);
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static xp_awk_node_t* __parse_while (xp_awk_t* awk);
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static xp_awk_node_t* __parse_for (xp_awk_t* awk);
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static xp_awk_node_t* __parse_do (xp_awk_t* awk);
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static xp_awk_node_t* __parse_break (xp_awk_t* awk);
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static xp_awk_node_t* __parse_continue (xp_awk_t* awk);
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static int __get_token (xp_awk_t* awk);
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static int __get_char (xp_awk_t* awk);
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static int __unget_char (xp_awk_t* awk, xp_cint_t c);
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static int __skip_spaces (xp_awk_t* awk);
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static int __skip_comment (xp_awk_t* awk);
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static int __classfy_ident (const xp_char_t* ident);
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struct __kwent
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{
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const xp_char_t* name;
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int type;
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};
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static struct __kwent __kwtab[] =
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{
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{ XP_TEXT("BEGIN"), TOKEN_BEGIN },
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{ XP_TEXT("END"), TOKEN_END },
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{ XP_TEXT("function"), TOKEN_FUNCTION },
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{ XP_TEXT("if"), TOKEN_IF },
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{ XP_TEXT("while"), TOKEN_WHILE },
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{ XP_TEXT("for"), TOKEN_FOR },
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{ XP_TEXT("do"), TOKEN_DO },
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{ XP_TEXT("break"), TOKEN_BREAK },
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{ XP_TEXT("continue"), TOKEN_CONTINUE },
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{ XP_TEXT("return"), TOKEN_RETURN },
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{ XP_TEXT("exit"), TOKEN_EXIT },
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{ XP_TEXT("delete"), TOKEN_DELETE },
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{ XP_TEXT("next"), TOKEN_NEXT },
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{ XP_TEXT("nextfile"), TOKEN_NEXTFILE },
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{ XP_NULL, 0 },
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};
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#define GET_CHAR(awk) \
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do { if (__get_char(awk) == -1) return -1; } while(0)
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#define GET_CHAR_TO(awk,c) do { \
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if (__get_char(awk) == -1) return -1; \
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c = (awk)->lex.curc; \
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} while(0)
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#define SET_TOKEN_TYPE(awk,code) ((awk)->token.type = code)
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#define ADD_TOKEN_CHAR(awk,c) do { \
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if (xp_str_ccat(&(awk)->token.name,(c)) == -1) { \
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(awk)->errnum = XP_AWK_ENOMEM; return -1; \
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} \
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} while (0)
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#define ADD_TOKEN_STR(awk,str) do { \
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if (xp_str_cat(&(awk)->token.name,(str)) == -1) { \
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(awk)->errnum = XP_AWK_ENOMEM; return -1; \
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} \
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} while (0)
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#define GET_TOKEN(awk) \
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do { if (__get_token(awk) == -1) return -1; } while(0)
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#define MATCH(awk,token_type) ((awk)->token.type == (token_type))
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#define CONSUME(awk) \
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do { if (__get_token(awk) == -1) return XP_NULL; } while(0)
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#define PANIC(awk,code) do { (awk)->errnum = (code); return XP_NULL; } while (0);
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void __print_tabs (int depth)
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{
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int i;
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for (i = 0; i < depth; i++) xp_printf (XP_TEXT("\t"));
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}
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void __print_parse_tree (xp_awk_node_t* tree, int depth)
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{
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xp_awk_node_t* p;
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p = tree;
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while (p != XP_NULL) {
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if (p->type == XP_AWK_NODE_BLOCK) {
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__print_tabs (depth);
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xp_printf (XP_TEXT("{\n"));
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__print_parse_tree (((xp_awk_node_block_t*)p)->body, depth + 1);
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__print_tabs (depth);
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xp_printf (XP_TEXT("}\n"));
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}
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else if (p->type == XP_AWK_NODE_BREAK) {
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__print_tabs (depth);
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xp_printf (XP_TEXT("break;\n"));
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}
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else if (p->type == XP_AWK_NODE_CONTINUE) {
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__print_tabs (depth);
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xp_printf (XP_TEXT("continue;\n"));
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}
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p = p->next;
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}
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}
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void print_parse_tree (xp_awk_node_t* tree)
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{
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__print_parse_tree (tree, 0);
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}
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int xp_awk_parse (xp_awk_t* awk)
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{
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xp_awk_node_t* node;
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GET_CHAR (awk);
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GET_TOKEN (awk);
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node = __parse_program(awk);
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if (node == XP_NULL) {
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xp_printf (XP_TEXT("error - %d\n"), awk->errnum);
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return -1;
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}
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xp_printf (XP_TEXT("end - %d\n"), awk->errnum);
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awk->tree = node;
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return 0;
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}
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static xp_awk_node_t* __parse_program (xp_awk_t* awk)
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{
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/*
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pattern { action }
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function name (parameter-list) { statement }
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*/
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xp_awk_node_t* node;
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while (1) {
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xp_printf (XP_TEXT(">>>>> starting ... for testing ...\n"));
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if (MATCH(awk,TOKEN_FUNCTION)) {
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node = __parse_funcdcl(awk);
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}
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else {
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node = __parse_patnact(awk);
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}
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if (node == XP_NULL) return XP_NULL;
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xp_printf (XP_TEXT(">>>>> breaking ... for testing ...\n"));
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break;
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}
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return node;
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}
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static xp_awk_node_t* __parse_funcdcl (xp_awk_t* awk)
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{
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return XP_NULL;
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}
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static xp_awk_node_t* __parse_patnact (xp_awk_t* awk)
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{
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/*
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BEGIN
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END
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expressions
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/regular expression/
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pattern && pattern
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pattern || pattern
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!pattern
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(pattern)
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pattern, pattern
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*/
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xp_awk_node_t* node;
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if (MATCH(awk,TOKEN_BEGIN)) {
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CONSUME (awk);
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}
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else if (MATCH(awk,TOKEN_END)) {
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CONSUME (awk);
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}
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/* patterns ...
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* etc */
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if (!MATCH(awk,TOKEN_LBRACE)) {
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PANIC (awk, XP_AWK_ELBRACE);
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}
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CONSUME (awk);
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node = __parse_block(awk);
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if (node == XP_NULL) return XP_NULL;
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return node;
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}
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/* TODO: what is the best name for the parsing routine for the outermost block? */
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static xp_awk_node_t* __parse_block (xp_awk_t* awk)
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{
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xp_awk_node_block_t* blk;
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xp_awk_node_t* node, * prev;
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int saved_token;
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xp_printf (XP_TEXT("__parse_block....\n"));
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blk = (xp_awk_node_block_t*) xp_malloc (xp_sizeof(xp_awk_node_block_t));
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if (blk == XP_NULL) {
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/* TODO: do some clean-up */
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PANIC (awk, XP_AWK_ENOMEM);
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}
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blk->type = XP_AWK_NODE_BLOCK;
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blk->next = XP_NULL;
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blk->body = prev = XP_NULL;
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while (1) {
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saved_token = awk->token.type;
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if (MATCH(awk,TOKEN_EOF)) {
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/* TODO: do come clean-up */
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PANIC (awk, XP_AWK_EENDSRC);
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}
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if (MATCH(awk,TOKEN_RBRACE)) {
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/* TODO: should finalize a block */
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CONSUME (awk);
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break;
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}
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if (MATCH(awk, TOKEN_SEMICOLON)) {
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/* null statement */
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CONSUME (awk);
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continue;
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}
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if (MATCH(awk,TOKEN_LBRACE)) {
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/* nested block */
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CONSUME (awk);
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node = __parse_block(awk);
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}
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else node = __parse_stat (awk);
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if (node == XP_NULL) return XP_NULL;
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if (prev == XP_NULL) blk->body = node;
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else prev->next = node;
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prev = node;
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}
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return (xp_awk_node_t*)blk;
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}
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static xp_awk_node_t* __parse_stat (xp_awk_t* awk)
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{
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xp_awk_node_t* node;
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if (MATCH(awk,TOKEN_IF)) {
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CONSUME (awk);
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node = __parse_if(awk);
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}
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else if (MATCH(awk,TOKEN_WHILE)) {
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CONSUME (awk);
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node = __parse_while(awk);
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}
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else if (MATCH(awk,TOKEN_FOR)) {
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CONSUME (awk);
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node = __parse_for(awk);
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}
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else if (MATCH(awk,TOKEN_DO)) {
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CONSUME (awk);
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node = __parse_do(awk);
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}
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else if (MATCH(awk,TOKEN_BREAK)) {
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CONSUME (awk);
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node = __parse_break(awk);
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}
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else if (MATCH(awk,TOKEN_CONTINUE)) {
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CONSUME (awk);
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node = __parse_continue(awk);
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}
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else if (MATCH(awk,TOKEN_RETURN)) {
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CONSUME (awk);
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/* TOOD: */
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node = XP_NULL;
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}
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else if (MATCH(awk,TOKEN_EXIT)) {
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CONSUME (awk);
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/* TOOD: */
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node = XP_NULL;
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}
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else if (MATCH(awk,TOKEN_DELETE)) {
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CONSUME (awk);
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/* TOOD: */
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node = XP_NULL;
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}
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else if (MATCH(awk,TOKEN_NEXT)) {
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CONSUME (awk);
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/* TOOD: */
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node = XP_NULL;
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}
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else if (MATCH(awk,TOKEN_NEXTFILE)) {
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CONSUME (awk);
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/* TOOD: */
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node = XP_NULL;
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}
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else {
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node = __parse_expr(awk);
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}
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/* check if a statement ends with a semicolon */
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if (!MATCH(awk,TOKEN_SEMICOLON)) {
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/* TODO: do some clean-up */
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PANIC (awk, XP_AWK_ESEMICOLON);
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}
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/* eat up the semicolon and read in the next token */
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CONSUME (awk);
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return node;
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}
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static xp_awk_node_t* __parse_expr (xp_awk_t* awk)
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{
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/*
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* <expression> ::= <assignment> | <basic expression>
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* <assignment> ::= <assignment target> assignmentOperator <basic expression>
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* assignmentOperator ::= '='
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* <basic expression> ::=
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*/
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if (MATCH(awk,TOKEN_IDENT)) {
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// TODO: use a different approach later...
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xp_char_t* ident = xp_strdup (XP_STR_BUF(&awk->token.name));
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if (ident == XP_NULL) {
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// TODO: memory clean up
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PANIC (awk, XP_AWK_ENOMEM);
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}
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CONSUME (awk);
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if (MATCH(awk,TOKEN_ASSIGN)) {
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CONSUME (awk);
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if (__parse_assignment(awk, ident) == XP_NULL) {
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// TODO: memory clean up
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return XP_NULL;
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}
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}
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else {
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return __parse_basic_expr (awk, ident);
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}
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}
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return __parse_basic_expr (awk, XP_NULL);
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}
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static xp_awk_node_t* __parse_assignment (xp_awk_t* awk, const xp_char_t* ident)
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{
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xp_assert (ident != XP_NULL);
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return XP_NULL;
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}
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static xp_awk_node_t* __parse_basic_expr (xp_awk_t* awk, const xp_char_t* ident)
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{
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/* <basic expression> ::= <additive>
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* <additive> ::= <multiplicative> [additiveOp <multiplicative>]*
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* <multiplicative> ::= <unary> [multiplicativeOp <unary>]*
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* <unary> ::= [unaryOp]* <term>
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* <term> ::= <function call> | variable | literals
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* <function call> ::= <identifier> <lparen> <basic expression list>* <rparen>
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* <basic expression list> ::= <basic expression> [comma <basic expression>]*
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*/
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return __parse_additive (awk);
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}
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static xp_awk_node_t* __parse_additive (xp_awk_t* awk)
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{
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xp_awk_node_t* top, * left, * right;
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left = __parse_multiplicative (awk);
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if (left == XP_NULL) return XP_NULL;
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while (MATCH(awk,TOKEN_MUL) ||
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MATCH(awk,TOKEN_DIV) ||
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MATCH(awk,TOKEN_MOD)) {
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CONSUME (awk);
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right = __parse_multiplicative (awk);
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if (right == XP_NULL) {
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// TODO: memory clean-up
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return XP_NULL;
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}
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}
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return top;
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}
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static xp_awk_node_t* __parse_multiplicative (xp_awk_t* awk)
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{
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xp_awk_node_t* top, * left, * right;
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left = __parse_unary (awk);
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if (left == XP_NULL) return XP_NULL;
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while (MATCH(awk,TOKEN_MUL) ||
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MATCH(awk,TOKEN_DIV) ||
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MATCH(awk,TOKEN_MOD)) {
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CONSUME (awk);
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right = __parse_unary (awk);
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if (right == XP_NULL) {
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// TODO: memory clean-up
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return XP_NULL;
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}
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}
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return top;
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}
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static xp_awk_node_t* __parse_unary (xp_awk_t* awk)
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{
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return __parse_primary (awk);
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}
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static xp_awk_node_t* __parse_primary (xp_awk_t* awk)
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{
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#if 0
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if (MATCH(awk,TOKEN_IDENT)) {
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xp_awk_node_term_t* node;
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node = (xp_awk_node_term_t*)xp_malloc(xp_sizeof(xp_awk_node_term_t));
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if (node == XP_NULL) PANIC (awk, XP_AWK_ENOMEM);
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node->type = XP_AWK_NODE_IDT;
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node->next = XP_NULL;
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node->value = token_value....
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CONSUME (awk);
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}
|
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else if (MATCH(awk,TOKEN_STRING)) {
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xp_awk_node_term_t* node;
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node = (xp_awk_node_term_t*)xp_malloc(xp_sizeof(xp_awk_node_term_t));
|
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if (node == XP_NULL) PANIC (awk, XP_AWK_ENOMEM);
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node->type = XP_AWK_NODE_STR;
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node->next = XP_NULL;
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node->value = token_value;
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CONSUME (awk);
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}
|
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else if (MATCH(awk,TOKEN_LPAREN)) {
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xp_awk_node_t* tmp;
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xp_awk_node_term_t* node;
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|
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CONSUME (awk);
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tmp = __parse_expr (awk);
|
|
if (tmp == XP_NULL) return XP_NULL;
|
|
|
|
node = (xp_awk_node_term_t*)xp_malloc(xp_sizeof(xp_awk_node_term_t));
|
|
if (node == XP_NULL) PANIC (awk, XP_AWK_ENOMEM);
|
|
|
|
node->type = XP_AWK_NODE_EXPR;
|
|
node->next = XP_NULL;
|
|
node->value = tmp;
|
|
}
|
|
|
|
#endif
|
|
/* valid expression introducer is expected */
|
|
PANIC (awk, XP_AWK_EEXPR);
|
|
}
|
|
|
|
static xp_awk_node_t* __parse_if (xp_awk_t* awk)
|
|
{
|
|
return XP_NULL;
|
|
}
|
|
|
|
static xp_awk_node_t* __parse_while (xp_awk_t* awk)
|
|
{
|
|
return XP_NULL;
|
|
}
|
|
|
|
static xp_awk_node_t* __parse_for (xp_awk_t* awk)
|
|
{
|
|
return XP_NULL;
|
|
}
|
|
|
|
static xp_awk_node_t* __parse_do (xp_awk_t* awk)
|
|
{
|
|
return XP_NULL;
|
|
}
|
|
|
|
static xp_awk_node_t* __parse_break (xp_awk_t* awk)
|
|
{
|
|
xp_awk_node_t* node;
|
|
|
|
node = (xp_awk_node_t*) xp_malloc (xp_sizeof(xp_awk_node_t));
|
|
if (node == XP_NULL) PANIC (awk, XP_AWK_ENOMEM);
|
|
node->type = XP_AWK_NODE_BREAK;
|
|
node->next = XP_NULL;
|
|
|
|
/* TODO: do i have to consume a semicolon here???? */
|
|
return node;
|
|
}
|
|
|
|
static xp_awk_node_t* __parse_continue (xp_awk_t* awk)
|
|
{
|
|
xp_awk_node_t* node;
|
|
|
|
node = (xp_awk_node_t*) xp_malloc (xp_sizeof(xp_awk_node_t));
|
|
if (node == XP_NULL) PANIC (awk, XP_AWK_ENOMEM);
|
|
node->type = XP_AWK_NODE_CONTINUE;
|
|
node->next = XP_NULL;
|
|
|
|
/* TODO: do i have to consume a semicolon here???? */
|
|
return node;
|
|
}
|
|
|
|
static int __get_token (xp_awk_t* awk)
|
|
{
|
|
xp_cint_t c;
|
|
int n;
|
|
|
|
do {
|
|
if (__skip_spaces(awk) == -1) return -1;
|
|
if ((n = __skip_comment(awk)) == -1) return -1;
|
|
} while (n == 1);
|
|
|
|
xp_str_clear (&awk->token.name);
|
|
c = awk->lex.curc;
|
|
|
|
if (c == XP_CHAR_EOF) {
|
|
SET_TOKEN_TYPE (awk, TOKEN_EOF);
|
|
}
|
|
else if (xp_isdigit(c)) {
|
|
/* number */
|
|
}
|
|
else if (xp_isalpha(c) || c == XP_CHAR('_')) {
|
|
/* identifier */
|
|
do {
|
|
ADD_TOKEN_CHAR (awk, c);
|
|
GET_CHAR_TO (awk, c);
|
|
} while (xp_isalpha(c) || c == XP_CHAR('_') || xp_isdigit(c));
|
|
|
|
SET_TOKEN_TYPE (awk, __classfy_ident(XP_STR_BUF(&awk->token.name)));
|
|
}
|
|
else if (c == XP_CHAR('\"')) {
|
|
/* string */
|
|
}
|
|
else if (c == XP_CHAR('/')) {
|
|
/* regular expression */
|
|
}
|
|
else if (c == XP_CHAR('=')) {
|
|
GET_CHAR_TO (awk, c);
|
|
if (c == XP_CHAR('=')) {
|
|
SET_TOKEN_TYPE (awk, TOKEN_EQ);
|
|
ADD_TOKEN_STR (awk, XP_TEXT("=="));
|
|
GET_CHAR_TO (awk, c);
|
|
}
|
|
else {
|
|
SET_TOKEN_TYPE (awk, TOKEN_ASSIGN);
|
|
ADD_TOKEN_STR (awk, XP_TEXT("="));
|
|
}
|
|
}
|
|
else if (c == XP_CHAR('!')) {
|
|
GET_CHAR_TO (awk, c);
|
|
if (c == XP_CHAR('=')) {
|
|
SET_TOKEN_TYPE (awk, TOKEN_NE);
|
|
ADD_TOKEN_STR (awk, XP_TEXT("!="));
|
|
GET_CHAR_TO (awk, c);
|
|
}
|
|
else {
|
|
SET_TOKEN_TYPE (awk, TOKEN_NOT);
|
|
ADD_TOKEN_STR (awk, XP_TEXT("!"));
|
|
}
|
|
}
|
|
else if (c == XP_CHAR('+')) {
|
|
GET_CHAR_TO (awk, c);
|
|
if (c == XP_CHAR('+')) {
|
|
SET_TOKEN_TYPE (awk, TOKEN_PLUS_PLUS);
|
|
ADD_TOKEN_STR (awk, XP_TEXT("++"));
|
|
GET_CHAR_TO (awk, c);
|
|
}
|
|
else if (c == XP_CHAR('=')) {
|
|
SET_TOKEN_TYPE (awk, TOKEN_PLUS_ASSIGN);
|
|
ADD_TOKEN_STR (awk, XP_TEXT("+="));
|
|
GET_CHAR_TO (awk, c);
|
|
}
|
|
else if (xp_isdigit(c)) {
|
|
// read_number (XP_CHAR('+'));
|
|
}
|
|
else {
|
|
SET_TOKEN_TYPE (awk, TOKEN_PLUS);
|
|
ADD_TOKEN_STR (awk, XP_TEXT("+"));
|
|
}
|
|
}
|
|
else if (c == XP_CHAR('-')) {
|
|
GET_CHAR_TO (awk, c);
|
|
if (c == XP_CHAR('-')) {
|
|
SET_TOKEN_TYPE (awk, TOKEN_MINUS_MINUS);
|
|
ADD_TOKEN_STR (awk, XP_TEXT("--"));
|
|
GET_CHAR_TO (awk, c);
|
|
}
|
|
else if (c == XP_CHAR('=')) {
|
|
SET_TOKEN_TYPE (awk, TOKEN_MINUS_ASSIGN);
|
|
ADD_TOKEN_STR (awk, XP_TEXT("-="));
|
|
GET_CHAR_TO (awk, c);
|
|
}
|
|
else if (xp_isdigit(c)) {
|
|
// read_number (XP_CHAR('-'));
|
|
}
|
|
else {
|
|
SET_TOKEN_TYPE (awk, TOKEN_MINUS);
|
|
ADD_TOKEN_STR (awk, XP_TEXT("-"));
|
|
}
|
|
}
|
|
else if (c == XP_CHAR('*')) {
|
|
SET_TOKEN_TYPE (awk, TOKEN_MUL);
|
|
ADD_TOKEN_CHAR (awk, c);
|
|
GET_CHAR_TO (awk, c);
|
|
}
|
|
else if (c == XP_CHAR('/')) {
|
|
SET_TOKEN_TYPE (awk, TOKEN_DIV);
|
|
ADD_TOKEN_CHAR (awk, c);
|
|
GET_CHAR_TO (awk, c);
|
|
}
|
|
else if (c == XP_CHAR('%')) {
|
|
SET_TOKEN_TYPE (awk, TOKEN_MOD);
|
|
ADD_TOKEN_CHAR (awk, c);
|
|
GET_CHAR_TO (awk, c);
|
|
}
|
|
else if (c == XP_CHAR('(')) {
|
|
SET_TOKEN_TYPE (awk, TOKEN_LPAREN);
|
|
ADD_TOKEN_CHAR (awk, c);
|
|
GET_CHAR_TO (awk, c);
|
|
}
|
|
else if (c == XP_CHAR(')')) {
|
|
SET_TOKEN_TYPE (awk, TOKEN_RPAREN);
|
|
ADD_TOKEN_CHAR (awk, c);
|
|
GET_CHAR_TO (awk, c);
|
|
}
|
|
else if (c == XP_CHAR('{')) {
|
|
SET_TOKEN_TYPE (awk, TOKEN_LBRACE);
|
|
ADD_TOKEN_CHAR (awk, c);
|
|
GET_CHAR_TO (awk, c);
|
|
}
|
|
else if (c == XP_CHAR('}')) {
|
|
SET_TOKEN_TYPE (awk, TOKEN_RBRACE);
|
|
ADD_TOKEN_CHAR (awk, c);
|
|
GET_CHAR_TO (awk, c);
|
|
}
|
|
else if (c == XP_CHAR('[')) {
|
|
SET_TOKEN_TYPE (awk, TOKEN_LBRACKET);
|
|
ADD_TOKEN_CHAR (awk, c);
|
|
GET_CHAR_TO (awk, c);
|
|
}
|
|
else if (c == XP_CHAR(']')) {
|
|
SET_TOKEN_TYPE (awk, TOKEN_RBRACKET);
|
|
ADD_TOKEN_CHAR (awk, c);
|
|
GET_CHAR_TO (awk, c);
|
|
}
|
|
else if (c == XP_CHAR(';')) {
|
|
SET_TOKEN_TYPE (awk, TOKEN_SEMICOLON);
|
|
ADD_TOKEN_CHAR (awk, c);
|
|
GET_CHAR_TO (awk, c);
|
|
}
|
|
else {
|
|
awk->errnum = XP_AWK_ELXCHR;
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __get_char (xp_awk_t* awk)
|
|
{
|
|
xp_ssize_t n;
|
|
|
|
if (awk->lex.ungotc_count > 0) {
|
|
awk->lex.curc = awk->lex.ungotc[--awk->lex.ungotc_count];
|
|
return 0;
|
|
}
|
|
|
|
n = awk->src_func(XP_AWK_IO_DATA, awk->src_arg, &awk->lex.curc, 1);
|
|
if (n == -1) {
|
|
awk->errnum = XP_AWK_ESRCDT;
|
|
return -1;
|
|
}
|
|
if (n == 0) awk->lex.curc = XP_CHAR_EOF;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __unget_char (xp_awk_t* awk, xp_cint_t c)
|
|
{
|
|
if (awk->lex.ungotc_count >= xp_countof(awk->lex.ungotc)) {
|
|
awk->errnum = XP_AWK_ELXUNG;
|
|
return -1;
|
|
}
|
|
|
|
awk->lex.ungotc[awk->lex.ungotc_count++] = c;
|
|
return 0;
|
|
}
|
|
|
|
static int __skip_spaces (xp_awk_t* awk)
|
|
{
|
|
xp_cint_t c = awk->lex.curc;
|
|
while (xp_isspace(c)) GET_CHAR_TO (awk, c);
|
|
return 0;
|
|
}
|
|
|
|
static int __skip_comment (xp_awk_t* awk)
|
|
{
|
|
xp_cint_t c = awk->lex.curc;
|
|
|
|
if (c != XP_CHAR('/')) return 0;
|
|
GET_CHAR_TO (awk, c);
|
|
|
|
if (c == XP_CHAR('/')) {
|
|
do {
|
|
GET_CHAR_TO (awk, c);
|
|
} while (c != '\n' && c != XP_CHAR_EOF);
|
|
GET_CHAR (awk);
|
|
return 1;
|
|
}
|
|
else if (c == XP_CHAR('*')) {
|
|
do {
|
|
GET_CHAR_TO (awk, c);
|
|
if (c == XP_CHAR('*')) {
|
|
GET_CHAR_TO (awk, c);
|
|
if (c == XP_CHAR('/')) {
|
|
GET_CHAR_TO (awk, c);
|
|
break;
|
|
}
|
|
}
|
|
} while (0);
|
|
return 1;
|
|
}
|
|
|
|
if (__unget_char(awk, c) == -1) return -1;
|
|
return 0;
|
|
}
|
|
|
|
static int __classfy_ident (const xp_char_t* ident)
|
|
{
|
|
struct __kwent* p = __kwtab;
|
|
|
|
while (p->name != XP_NULL) {
|
|
if (xp_strcmp(p->name, ident) == 0) return p->type;
|
|
p++;
|
|
}
|
|
|
|
return TOKEN_IDENT;
|
|
}
|