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qse/ase/awk/parse.c

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/*
* $Id: parse.c,v 1.119 2006-06-21 15:37:51 bacon Exp $
*/
#include <xp/awk/awk_i.h>
#ifndef XP_AWK_STAND_ALONE
#include <xp/bas/memory.h>
#include <xp/bas/ctype.h>
#include <xp/bas/string.h>
#include <xp/bas/stdlib.h>
#include <xp/bas/assert.h>
#endif
enum
{
TOKEN_EOF,
TOKEN_ASSIGN,
TOKEN_PLUS_ASSIGN,
TOKEN_MINUS_ASSIGN,
TOKEN_MUL_ASSIGN,
TOKEN_DIV_ASSIGN,
TOKEN_MOD_ASSIGN,
TOKEN_EXP_ASSIGN,
TOKEN_EQ,
TOKEN_NE,
TOKEN_LE,
TOKEN_LT,
TOKEN_GE,
TOKEN_GT,
TOKEN_NM, /* not match */
TOKEN_NOT,
TOKEN_PLUS,
TOKEN_PLUSPLUS,
TOKEN_MINUS,
TOKEN_MINUSMINUS,
TOKEN_MUL,
TOKEN_DIV,
TOKEN_MOD,
TOKEN_LOR,
TOKEN_LAND,
TOKEN_BOR,
TOKEN_BXOR,
TOKEN_BAND,
TOKEN_BORAND,
TOKEN_TILDE, /* used for unary bitwise-not and regex match */
TOKEN_RSHIFT,
TOKEN_LSHIFT,
TOKEN_IN,
TOKEN_EXP,
TOKEN_LPAREN,
TOKEN_RPAREN,
TOKEN_LBRACE,
TOKEN_RBRACE,
TOKEN_LBRACK,
TOKEN_RBRACK,
TOKEN_DOLLAR,
TOKEN_COMMA,
TOKEN_PERIOD,
TOKEN_SEMICOLON,
TOKEN_COLON,
TOKEN_QUEST,
TOKEN_INT,
TOKEN_REAL,
TOKEN_STR,
TOKEN_REX,
TOKEN_IDENT,
TOKEN_BEGIN,
TOKEN_END,
TOKEN_FUNCTION,
TOKEN_IF,
TOKEN_ELSE,
TOKEN_WHILE,
TOKEN_FOR,
TOKEN_DO,
TOKEN_BREAK,
TOKEN_CONTINUE,
TOKEN_RETURN,
TOKEN_EXIT,
TOKEN_DELETE,
TOKEN_GETLINE,
TOKEN_NEXT,
TOKEN_NEXTFILE,
TOKEN_PRINT,
TOKEN_PRINTF,
TOKEN_LOCAL,
TOKEN_GLOBAL,
__TOKEN_COUNT__
};
typedef struct __binmap_t __binmap_t;
struct __binmap_t
{
int token;
int binop;
};
static xp_awk_t* __parse_progunit (xp_awk_t* awk);
static xp_awk_t* __collect_globals (xp_awk_t* awk);
static xp_awk_t* __collect_locals (xp_awk_t* awk, xp_size_t nlocals);
static xp_awk_nde_t* __parse_function (xp_awk_t* awk);
static xp_awk_nde_t* __parse_begin (xp_awk_t* awk);
static xp_awk_nde_t* __parse_end (xp_awk_t* awk);
static xp_awk_nde_t* __parse_ptnblock (xp_awk_t* awk, xp_awk_nde_t* ptn);
static xp_awk_nde_t* __parse_action (xp_awk_t* awk);
static xp_awk_nde_t* __parse_block (xp_awk_t* awk, xp_bool_t is_top);
static xp_awk_nde_t* __parse_statement (xp_awk_t* awk);
static xp_awk_nde_t* __parse_statement_nb (xp_awk_t* awk);
static xp_awk_nde_t* __parse_expression (xp_awk_t* awk);
static xp_awk_nde_t* __parse_basic_expr (xp_awk_t* awk);
static xp_awk_nde_t* __parse_binary_expr (
xp_awk_t* awk, const __binmap_t* binmap,
xp_awk_nde_t*(*next_level_func)(xp_awk_t*));
static xp_awk_nde_t* __parse_logical_or (xp_awk_t* awk);
static xp_awk_nde_t* __parse_logical_and (xp_awk_t* awk);
static xp_awk_nde_t* __parse_in (xp_awk_t* awk);
static xp_awk_nde_t* __parse_regex_match (xp_awk_t* awk);
static xp_awk_nde_t* __parse_bitwise_or (xp_awk_t* awk);
static xp_awk_nde_t* __parse_bitwise_or_with_extio (xp_awk_t* awk);
static xp_awk_nde_t* __parse_bitwise_xor (xp_awk_t* awk);
static xp_awk_nde_t* __parse_bitwise_and (xp_awk_t* awk);
static xp_awk_nde_t* __parse_equality (xp_awk_t* awk);
static xp_awk_nde_t* __parse_relational (xp_awk_t* awk);
static xp_awk_nde_t* __parse_shift (xp_awk_t* awk);
static xp_awk_nde_t* __parse_additive (xp_awk_t* awk);
static xp_awk_nde_t* __parse_multiplicative (xp_awk_t* awk);
static xp_awk_nde_t* __parse_unary (xp_awk_t* awk);
static xp_awk_nde_t* __parse_increment (xp_awk_t* awk);
static xp_awk_nde_t* __parse_primary (xp_awk_t* awk);
static xp_awk_nde_t* __parse_primary_ident (xp_awk_t* awk);
static xp_awk_nde_t* __parse_hashidx (xp_awk_t* awk, xp_char_t* name);
static xp_awk_nde_t* __parse_fncall (
xp_awk_t* awk, xp_char_t* name, xp_awk_bfn_t* bfn);
static xp_awk_nde_t* __parse_if (xp_awk_t* awk);
static xp_awk_nde_t* __parse_while (xp_awk_t* awk);
static xp_awk_nde_t* __parse_for (xp_awk_t* awk);
static xp_awk_nde_t* __parse_dowhile (xp_awk_t* awk);
static xp_awk_nde_t* __parse_break (xp_awk_t* awk);
static xp_awk_nde_t* __parse_continue (xp_awk_t* awk);
static xp_awk_nde_t* __parse_return (xp_awk_t* awk);
static xp_awk_nde_t* __parse_exit (xp_awk_t* awk);
static xp_awk_nde_t* __parse_delete (xp_awk_t* awk);
static xp_awk_nde_t* __parse_print (xp_awk_t* awk);
static xp_awk_nde_t* __parse_printf (xp_awk_t* awk);
static xp_awk_nde_t* __parse_next (xp_awk_t* awk);
static xp_awk_nde_t* __parse_nextfile (xp_awk_t* awk);
static int __get_token (xp_awk_t* awk);
static int __get_number (xp_awk_t* awk);
static int __get_string (xp_awk_t* awk);
static int __get_regex (xp_awk_t* awk);
static int __get_char (xp_awk_t* awk);
static int __unget_char (xp_awk_t* awk, xp_cint_t c);
static int __skip_spaces (xp_awk_t* awk);
static int __skip_comment (xp_awk_t* awk);
static int __classify_ident (xp_awk_t* awk, const xp_char_t* ident);
static int __assign_to_opcode (xp_awk_t* awk);
static int __is_plain_var (xp_awk_nde_t* nde);
struct __kwent
{
const xp_char_t* name;
int type;
int valid; /* the entry is valid when this option is set */
};
static struct __kwent __kwtab[] =
{
{ XP_T("BEGIN"), TOKEN_BEGIN, 0 },
{ XP_T("END"), TOKEN_END, 0 },
{ XP_T("function"), TOKEN_FUNCTION, 0 },
{ XP_T("func"), TOKEN_FUNCTION, 0 },
{ XP_T("if"), TOKEN_IF, 0 },
{ XP_T("else"), TOKEN_ELSE, 0 },
{ XP_T("while"), TOKEN_WHILE, 0 },
{ XP_T("for"), TOKEN_FOR, 0 },
{ XP_T("do"), TOKEN_DO, 0 },
{ XP_T("break"), TOKEN_BREAK, 0 },
{ XP_T("continue"), TOKEN_CONTINUE, 0 },
{ XP_T("return"), TOKEN_RETURN, 0 },
{ XP_T("exit"), TOKEN_EXIT, 0 },
{ XP_T("delete"), TOKEN_DELETE, 0 },
{ XP_T("getline"), TOKEN_GETLINE, XP_AWK_EXTIO },
{ XP_T("next"), TOKEN_NEXT, 0 },
{ XP_T("nextfile"), TOKEN_NEXTFILE, 0 },
{ XP_T("print"), TOKEN_PRINT, XP_AWK_EXTIO },
{ XP_T("printf"), TOKEN_PRINTF, XP_AWK_EXTIO },
{ XP_T("local"), TOKEN_LOCAL, XP_AWK_EXPLICIT },
{ XP_T("global"), TOKEN_GLOBAL, XP_AWK_EXPLICIT },
{ XP_T("in"), TOKEN_IN, 0 },
{ XP_NULL, 0, 0 }
};
/* TODO:
static struct __kwent __bvtab[] =
{
{ XP_T("ARGC"), TOKEN_ARGC, 0 },
{ XP_T("ARGIND"), TOKEN_ARGIND, 0 },
{ XP_T("ARGV"), TOKEN_ARGV, 0 },
{ XP_T("CONVFMT"), TOKEN_CONVFMT, 0 },
{ XP_T("FIELDWIDTHS"), TOKEN_FIELDWIDTHS, 0 },
{ XP_T("ENVIRON"), TOKEN_ENVIRON, 0 },
{ XP_T("ERRNO"), TOKEN_ERRNO, 0 },
{ XP_T("FILENAME"), TOKEN_FILENAME, 0 },
{ XP_T("FNR"), TOKEN_FNR, 0 },
{ XP_T("FS"), TOKEN_FS, 0 },
{ XP_T("IGNORECASE"), TOKEN_IGNORECASE, 0 },
{ XP_T("NF"), TOKEN_NF, 0 },
{ XP_T("NR"), TOKEN_NR, 0 },
{ XP_T("OFMT"), TOKEN_OFMT, 0 },
{ XP_T("OFS"), TOKEN_OFS, 0 },
{ XP_T("ORS"), TOKEN_ORS, 0 },
{ XP_T("RS"), TOKEN_RS, 0 },
{ XP_T("RT"), TOKEN_RT, 0 },
{ XP_T("RSTART"), TOKEN_RSTART, 0 },
{ XP_T("RLENGTH"), TOKEN_RLENGTH, 0 },
{ XP_T("SUBSEP"), TOKEN_SUBSEP, 0 },
{ XP_NULL, 0, 0 }
};
*/
#define GET_CHAR(awk) \
do { if (__get_char(awk) == -1) return -1; } while(0)
#define GET_CHAR_TO(awk,c) \
do { \
if (__get_char(awk) == -1) return -1; \
c = (awk)->lex.curc; \
} while(0)
#define SET_TOKEN_TYPE(awk,code) ((awk)->token.type = code)
#define ADD_TOKEN_CHAR(awk,c) \
do { \
if (xp_str_ccat(&(awk)->token.name,(c)) == (xp_size_t)-1) { \
(awk)->errnum = XP_AWK_ENOMEM; return -1; \
} \
} while (0)
#define ADD_TOKEN_STR(awk,str) \
do { \
if (xp_str_cat(&(awk)->token.name,(str)) == (xp_size_t)-1) { \
(awk)->errnum = XP_AWK_ENOMEM; return -1; \
} \
} while (0)
#define GET_TOKEN(awk) \
do { if (__get_token(awk) == -1) return -1; } while (0)
#define MATCH(awk,token_type) ((awk)->token.type == (token_type))
#define CONSUME(awk) \
do { if (__get_token(awk) == -1) return XP_NULL; } while (0)
#define PANIC(awk,code) \
do { (awk)->errnum = (code); return XP_NULL; } while (0)
/* TODO: remove stdio.h */
#ifndef XP_AWK_STAND_ALONE
#include <xp/bas/stdio.h>
#endif
static int __dump_func (xp_awk_pair_t* pair, void* arg)
{
xp_awk_afn_t* afn = (xp_awk_afn_t*)pair->val;
xp_size_t i;
xp_assert (xp_strcmp(pair->key, afn->name) == 0);
xp_printf (XP_T("function %s ("), afn->name);
for (i = 0; i < afn->nargs; )
{
xp_printf (XP_T("__arg%lu"), (unsigned long)i++);
if (i >= afn->nargs) break;
xp_printf (XP_T(", "));
}
xp_printf (XP_T(")\n"));
xp_awk_prnpt (afn->body);
xp_printf (XP_T("\n"));
return 0;
}
static void __dump (xp_awk_t* awk)
{
xp_awk_chain_t* chain;
if (awk->tree.nglobals > 0)
{
xp_size_t i;
xp_printf (XP_T("global "));
for (i = 0; i < awk->tree.nglobals - 1; i++)
{
xp_printf (XP_T("__global%lu, "), (unsigned long)i);
}
xp_printf (XP_T("__global%lu;\n\n"), (unsigned long)i);
}
xp_awk_map_walk (&awk->tree.afns, __dump_func, XP_NULL);
if (awk->tree.begin != XP_NULL)
{
xp_printf (XP_T("BEGIN "));
xp_awk_prnpt (awk->tree.begin);
xp_printf (XP_T("\n"));
}
chain = awk->tree.chain;
while (chain != XP_NULL)
{
if (chain->pattern != XP_NULL)
{
/*xp_awk_prnpt (chain->pattern);*/
xp_awk_prnptnpt (chain->pattern);
}
if (chain->action != XP_NULL)
{
xp_awk_prnpt (chain->action);
}
xp_printf (XP_T("\n"));
chain = chain->next;
}
if (awk->tree.end != XP_NULL)
{
xp_printf (XP_T("END "));
xp_awk_prnpt (awk->tree.end);
}
}
int xp_awk_parse (xp_awk_t* awk)
{
if (awk->srcio == XP_NULL)
{
/* the source code io handler is not set */
awk->errnum = XP_AWK_ENOSRCIO;
return -1;
}
xp_awk_clear (awk);
GET_CHAR (awk);
GET_TOKEN (awk);
while (1)
{
if (MATCH(awk,TOKEN_EOF)) break;
if (__parse_progunit(awk) == XP_NULL)
{
xp_awk_clear (awk);
return -1;
}
}
awk->tree.nglobals = xp_awk_tab_getsize(&awk->parse.globals);
xp_printf (XP_T("-----------------------------\n"));
__dump (awk);
return 0;
}
static xp_awk_t* __parse_progunit (xp_awk_t* awk)
{
/*
pattern { action }
function name (parameter-list) { statement }
*/
if ((awk->opt.parse & XP_AWK_EXPLICIT) && MATCH(awk,TOKEN_GLOBAL))
{
xp_size_t nglobals;
if (__get_token(awk) == -1) return XP_NULL;
nglobals = xp_awk_tab_getsize(&awk->parse.globals);
if (__collect_globals(awk) == XP_NULL)
{
xp_awk_tab_remove (
&awk->parse.globals, nglobals,
xp_awk_tab_getsize(&awk->parse.globals) - nglobals);
return XP_NULL;
}
}
else if (MATCH(awk,TOKEN_FUNCTION))
{
if (__parse_function(awk) == XP_NULL) return XP_NULL;
}
else if (MATCH(awk,TOKEN_BEGIN))
{
if (__parse_begin(awk) == XP_NULL) return XP_NULL;
}
else if (MATCH(awk,TOKEN_END))
{
if (__parse_end(awk) == XP_NULL) return XP_NULL;
}
else if (MATCH(awk,TOKEN_LBRACE))
{
/* pattern less block */
if (__parse_ptnblock(awk,XP_NULL) == XP_NULL) return XP_NULL;
}
else
{
/*
expressions
/regular expression/
pattern && pattern
pattern || pattern
!pattern
(pattern)
pattern, pattern
*/
xp_awk_nde_t* ptn;
ptn = __parse_expression (awk);
if (ptn == XP_NULL) return XP_NULL;
xp_assert (ptn->next == XP_NULL);
if (MATCH(awk,TOKEN_COMMA))
{
if (__get_token(awk) == -1)
{
xp_awk_clrpt (ptn);
return XP_NULL;
}
ptn->next = __parse_expression (awk);
if (ptn->next == XP_NULL)
{
xp_awk_clrpt (ptn);
return XP_NULL;
}
}
if (MATCH(awk,TOKEN_LBRACE))
{
if (__parse_ptnblock (awk,ptn) == XP_NULL)
{
xp_awk_clrpt (ptn);
return XP_NULL;
}
}
else
{
/* pattern without a block */
/* TODO: ... pattern { print $0; }*/
xp_awk_clrpt (ptn);
xp_printf (XP_T("BLOCKLESS NOT IMPLEMENTED\n"));
PANIC (awk, XP_AWK_EINTERNAL);
}
}
return awk;
}
static xp_awk_nde_t* __parse_function (xp_awk_t* awk)
{
xp_char_t* name;
xp_char_t* name_dup;
xp_awk_nde_t* body;
xp_awk_afn_t* afn;
xp_size_t nargs;
xp_awk_pair_t* pair;
int n;
/* eat up the keyword 'function' and get the next token */
if (__get_token(awk) == -1) return XP_NULL;
/* match a function name */
if (!MATCH(awk,TOKEN_IDENT))
{
/* cannot find a valid identifier for a function name */
PANIC (awk, XP_AWK_EIDENT);
}
name = XP_STR_BUF(&awk->token.name);
if (xp_awk_map_get(&awk->tree.afns, name) != XP_NULL)
{
/* the function is defined previously */
PANIC (awk, XP_AWK_EDUPFUNC);
}
if (awk->opt.parse & XP_AWK_UNIQUE)
{
/* check if it coincides to be a global variable name */
if (xp_awk_tab_find(&awk->parse.globals, name, 0) != (xp_size_t)-1)
{
PANIC (awk, XP_AWK_EDUPNAME);
}
}
/* clone the function name before it is overwritten */
name_dup = xp_strdup (name);
if (name_dup == XP_NULL) PANIC (awk, XP_AWK_ENOMEM);
/* get the next token */
if (__get_token(awk) == -1)
{
xp_free (name_dup);
return XP_NULL;
}
/* match a left parenthesis */
if (!MATCH(awk,TOKEN_LPAREN))
{
/* a function name is not followed by a left parenthesis */
xp_free (name_dup);
PANIC (awk, XP_AWK_ELPAREN);
}
/* get the next token */
if (__get_token(awk) == -1)
{
xp_free (name_dup);
return XP_NULL;
}
/* make sure that parameter table is empty */
xp_assert (xp_awk_tab_getsize(&awk->parse.params) == 0);
/* read parameter list */
if (MATCH(awk,TOKEN_RPAREN))
{
/* no function parameter found. get the next token */
if (__get_token(awk) == -1)
{
xp_free (name_dup);
return XP_NULL;
}
}
else
{
while (1)
{
xp_char_t* param;
if (!MATCH(awk,TOKEN_IDENT))
{
xp_free (name_dup);
xp_awk_tab_clear (&awk->parse.params);
PANIC (awk, XP_AWK_EIDENT);
}
param = XP_STR_BUF(&awk->token.name);
if (awk->opt.parse & XP_AWK_UNIQUE)
{
/* check if a parameter conflicts with a function */
if (xp_strcmp(name_dup, param) == 0 ||
xp_awk_map_get(&awk->tree.afns, param) != XP_NULL)
{
xp_free (name_dup);
xp_awk_tab_clear (&awk->parse.params);
PANIC (awk, XP_AWK_EDUPNAME);
}
/* NOTE: the following is not a conflict
* global x;
* function f (x) { print x; }
* x in print x is a parameter
*/
}
/* check if a parameter conflicts with other parameters */
if (xp_awk_tab_find(&awk->parse.params, param, 0) != (xp_size_t)-1)
{
xp_free (name_dup);
xp_awk_tab_clear (&awk->parse.params);
PANIC (awk, XP_AWK_EDUPPARAM);
}
/* push the parameter to the parameter list */
if (xp_awk_tab_add(&awk->parse.params, param) == (xp_size_t)-1)
{
xp_free (name_dup);
xp_awk_tab_clear (&awk->parse.params);
PANIC (awk, XP_AWK_ENOMEM);
}
if (__get_token(awk) == -1)
{
xp_free (name_dup);
xp_awk_tab_clear (&awk->parse.params);
return XP_NULL;
}
if (MATCH(awk,TOKEN_RPAREN)) break;
if (!MATCH(awk,TOKEN_COMMA))
{
xp_free (name_dup);
xp_awk_tab_clear (&awk->parse.params);
PANIC (awk, XP_AWK_ECOMMA);
}
if (__get_token(awk) == -1)
{
xp_free (name_dup);
xp_awk_tab_clear (&awk->parse.params);
return XP_NULL;
}
}
if (__get_token(awk) == -1)
{
xp_free (name_dup);
xp_awk_tab_clear (&awk->parse.params);
return XP_NULL;
}
}
/* check if the function body starts with a left brace */
if (!MATCH(awk,TOKEN_LBRACE))
{
xp_free (name_dup);
xp_awk_tab_clear (&awk->parse.params);
PANIC (awk, XP_AWK_ELBRACE);
}
if (__get_token(awk) == -1)
{
xp_free (name_dup);
xp_awk_tab_clear (&awk->parse.params);
return XP_NULL;
}
/* actual function body */
body = __parse_block (awk, xp_true);
if (body == XP_NULL)
{
xp_free (name_dup);
xp_awk_tab_clear (&awk->parse.params);
return XP_NULL;
}
/* TODO: consider if the parameter names should be saved for some reasons.. */
nargs = xp_awk_tab_getsize (&awk->parse.params);
/* parameter names are not required anymore. clear them */
xp_awk_tab_clear (&awk->parse.params);
afn = (xp_awk_afn_t*) xp_malloc (xp_sizeof(xp_awk_afn_t));
if (afn == XP_NULL)
{
xp_free (name_dup);
xp_awk_clrpt (body);
return XP_NULL;
}
afn->name = XP_NULL; /* function name set below */
afn->nargs = nargs;
afn->body = body;
n = xp_awk_map_putx (&awk->tree.afns, name_dup, afn, &pair);
if (n < 0)
{
xp_free (name_dup);
xp_awk_clrpt (body);
xp_free (afn);
PANIC (awk, XP_AWK_ENOMEM);
}
/* duplicate functions should have been detected previously */
xp_assert (n != 0);
afn->name = pair->key; /* do some trick to save a string. */
xp_free (name_dup);
return body;
}
static xp_awk_nde_t* __parse_begin (xp_awk_t* awk)
{
xp_awk_nde_t* nde;
if (awk->tree.begin != XP_NULL) PANIC (awk, XP_AWK_EDUPBEGIN);
if (__get_token(awk) == -1) return XP_NULL;
nde = __parse_action (awk);
if (nde == XP_NULL) return XP_NULL;
awk->tree.begin = nde;
return nde;
}
static xp_awk_nde_t* __parse_end (xp_awk_t* awk)
{
xp_awk_nde_t* nde;
if (awk->tree.end != XP_NULL) PANIC (awk, XP_AWK_EDUPEND);
if (__get_token(awk) == -1) return XP_NULL;
nde = __parse_action (awk);
if (nde == XP_NULL) return XP_NULL;
awk->tree.end = nde;
return nde;
}
static xp_awk_nde_t* __parse_ptnblock (xp_awk_t* awk, xp_awk_nde_t* ptn)
{
xp_awk_nde_t* nde;
xp_awk_chain_t* chain;
nde = __parse_action (awk);
if (nde == XP_NULL) return XP_NULL;
chain = (xp_awk_chain_t*) xp_malloc (xp_sizeof(xp_awk_chain_t));
if (chain == XP_NULL)
{
xp_awk_clrpt (nde);
PANIC (awk, XP_AWK_ENOMEM);
}
chain->pattern = ptn;
chain->action = nde;
chain->next = XP_NULL;
if (awk->tree.chain == XP_NULL)
{
awk->tree.chain = chain;
awk->tree.chain_tail = chain;
}
else
{
awk->tree.chain_tail->next = chain;
awk->tree.chain_tail = chain;
}
return nde;
}
static xp_awk_nde_t* __parse_action (xp_awk_t* awk)
{
if (!MATCH(awk,TOKEN_LBRACE)) PANIC (awk, XP_AWK_ELBRACE);
if (__get_token(awk) == -1) return XP_NULL;
return __parse_block(awk, xp_true);
}
static xp_awk_nde_t* __parse_block (xp_awk_t* awk, xp_bool_t is_top)
{
xp_awk_nde_t* head, * curr, * nde;
xp_awk_nde_blk_t* block;
xp_size_t nlocals, nlocals_max, tmp;
nlocals = xp_awk_tab_getsize(&awk->parse.locals);
nlocals_max = awk->parse.nlocals_max;
/* local variable declarations */
if (awk->opt.parse & XP_AWK_EXPLICIT)
{
while (1)
{
if (!MATCH(awk,TOKEN_LOCAL)) break;
if (__get_token(awk) == -1)
{
xp_awk_tab_remove (
&awk->parse.locals, nlocals,
xp_awk_tab_getsize(&awk->parse.locals) - nlocals);
return XP_NULL;
}
if (__collect_locals(awk, nlocals) == XP_NULL)
{
xp_awk_tab_remove (
&awk->parse.locals, nlocals,
xp_awk_tab_getsize(&awk->parse.locals) - nlocals);
return XP_NULL;
}
}
}
/* block body */
head = XP_NULL; curr = XP_NULL;
while (1)
{
if (MATCH(awk,TOKEN_EOF))
{
xp_awk_tab_remove (
&awk->parse.locals, nlocals,
xp_awk_tab_getsize(&awk->parse.locals) - nlocals);
if (head != XP_NULL) xp_awk_clrpt (head);
PANIC (awk, XP_AWK_EENDSRC);
}
if (MATCH(awk,TOKEN_RBRACE))
{
if (__get_token(awk) == -1)
{
xp_awk_tab_remove (
&awk->parse.locals, nlocals,
xp_awk_tab_getsize(&awk->parse.locals) - nlocals);
if (head != XP_NULL) xp_awk_clrpt (head);
return XP_NULL;
}
break;
}
nde = __parse_statement (awk);
if (nde == XP_NULL)
{
xp_awk_tab_remove (
&awk->parse.locals, nlocals,
xp_awk_tab_getsize(&awk->parse.locals) - nlocals);
if (head != XP_NULL) xp_awk_clrpt (head);
return XP_NULL;
}
/* remove unnecessary statements */
if (nde->type == XP_AWK_NDE_NULL ||
(nde->type == XP_AWK_NDE_BLK &&
((xp_awk_nde_blk_t*)nde)->body == XP_NULL)) continue;
if (curr == XP_NULL) head = nde;
else curr->next = nde;
curr = nde;
}
block = (xp_awk_nde_blk_t*) xp_malloc (xp_sizeof(xp_awk_nde_blk_t));
if (block == XP_NULL)
{
xp_awk_tab_remove (
&awk->parse.locals, nlocals,
xp_awk_tab_getsize(&awk->parse.locals) - nlocals);
xp_awk_clrpt (head);
PANIC (awk, XP_AWK_ENOMEM);
}
tmp = xp_awk_tab_getsize(&awk->parse.locals);
if (tmp > awk->parse.nlocals_max) awk->parse.nlocals_max = tmp;
xp_awk_tab_remove (
&awk->parse.locals, nlocals, tmp - nlocals);
/* adjust the number of locals for a block without any statements */
/* if (head == XP_NULL) tmp = 0; */
block->type = XP_AWK_NDE_BLK;
block->next = XP_NULL;
block->body = head;
/* TODO: not only local variables but also nested blocks,
unless it is part of other constructs such as if, can be promoted
and merged to top-level block */
/* migrate all block-local variables to a top-level block */
if (is_top)
{
block->nlocals = awk->parse.nlocals_max - nlocals;
awk->parse.nlocals_max = nlocals_max;
}
else
{
/*block->nlocals = tmp - nlocals;*/
block->nlocals = 0;
}
return (xp_awk_nde_t*)block;
}
static xp_awk_t* __collect_globals (xp_awk_t* awk)
{
xp_char_t* global;
while (1)
{
if (!MATCH(awk,TOKEN_IDENT))
{
PANIC (awk, XP_AWK_EIDENT);
}
global = XP_STR_BUF(&awk->token.name);
if (awk->opt.parse & XP_AWK_UNIQUE)
{
/* check if it conflict with a function name */
if (xp_awk_map_get(&awk->tree.afns, global) != XP_NULL)
{
PANIC (awk, XP_AWK_EDUPNAME);
}
}
/* check if it conflicts with other global variable names */
if (xp_awk_tab_find(&awk->parse.globals, global, 0) != (xp_size_t)-1)
{
PANIC (awk, XP_AWK_EDUPVAR);
}
if (xp_awk_tab_add(&awk->parse.globals, global) == (xp_size_t)-1)
{
PANIC (awk, XP_AWK_ENOMEM);
}
if (__get_token(awk) == -1) return XP_NULL;
if (MATCH(awk,TOKEN_SEMICOLON)) break;
if (!MATCH(awk,TOKEN_COMMA))
{
PANIC (awk, XP_AWK_ECOMMA);
}
if (__get_token(awk) == -1) return XP_NULL;
}
/* skip a semicolon */
if (__get_token(awk) == -1) return XP_NULL;
return awk;
}
static xp_awk_t* __collect_locals (xp_awk_t* awk, xp_size_t nlocals)
{
xp_char_t* local;
while (1)
{
if (!MATCH(awk,TOKEN_IDENT))
{
PANIC (awk, XP_AWK_EIDENT);
}
local = XP_STR_BUF(&awk->token.name);
/* NOTE: it is not checked againt globals names */
if (awk->opt.parse & XP_AWK_UNIQUE)
{
/* check if it conflict with a function name */
if (xp_awk_map_get(&awk->tree.afns, local) != XP_NULL)
{
PANIC (awk, XP_AWK_EDUPNAME);
}
}
/* check if it conflicts with a paremeter name */
if (xp_awk_tab_find(&awk->parse.params, local, 0) != (xp_size_t)-1)
{
PANIC (awk, XP_AWK_EDUPNAME);
}
/* check if it conflicts with other local variable names */
if (xp_awk_tab_find(&awk->parse.locals, local,
((awk->opt.parse & XP_AWK_SHADING)? nlocals: 0)) != (xp_size_t)-1)
{
PANIC (awk, XP_AWK_EDUPVAR);
}
if (xp_awk_tab_add(&awk->parse.locals, local) == (xp_size_t)-1)
{
PANIC (awk, XP_AWK_ENOMEM);
}
if (__get_token(awk) == -1) return XP_NULL;
if (MATCH(awk,TOKEN_SEMICOLON)) break;
if (!MATCH(awk,TOKEN_COMMA))
{
PANIC (awk, XP_AWK_ECOMMA);
}
if (__get_token(awk) == -1) return XP_NULL;
}
/* skip a semicolon */
if (__get_token(awk) == -1) return XP_NULL;
return awk;
}
static xp_awk_nde_t* __parse_statement (xp_awk_t* awk)
{
xp_awk_nde_t* nde;
if (MATCH(awk,TOKEN_SEMICOLON))
{
/* null statement */
nde = (xp_awk_nde_t*) xp_malloc (xp_sizeof(xp_awk_nde_t));
if (nde == XP_NULL) PANIC (awk, XP_AWK_ENOMEM);
nde->type = XP_AWK_NDE_NULL;
nde->next = XP_NULL;
if (__get_token(awk) == -1)
{
xp_free (nde);
return XP_NULL;
}
}
else if (MATCH(awk,TOKEN_LBRACE))
{
if (__get_token(awk) == -1) return XP_NULL;
nde = __parse_block (awk, xp_false);
}
else nde = __parse_statement_nb (awk);
return nde;
}
static xp_awk_nde_t* __parse_statement_nb (xp_awk_t* awk)
{
xp_awk_nde_t* nde;
/*
* keywords that don't require any terminating semicolon
*/
if (MATCH(awk,TOKEN_IF))
{
if (__get_token(awk) == -1) return XP_NULL;
return __parse_if (awk);
}
else if (MATCH(awk,TOKEN_WHILE))
{
if (__get_token(awk) == -1) return XP_NULL;
return __parse_while (awk);
}
else if (MATCH(awk,TOKEN_FOR))
{
if (__get_token(awk) == -1) return XP_NULL;
return __parse_for (awk);
}
/*
* keywords that require a terminating semicolon
*/
if (MATCH(awk,TOKEN_DO))
{
if (__get_token(awk) == -1) return XP_NULL;
nde = __parse_dowhile (awk);
}
else if (MATCH(awk,TOKEN_BREAK))
{
if (__get_token(awk) == -1) return XP_NULL;
nde = __parse_break(awk);
}
else if (MATCH(awk,TOKEN_CONTINUE))
{
if (__get_token(awk) == -1) return XP_NULL;
nde = __parse_continue(awk);
}
else if (MATCH(awk,TOKEN_RETURN))
{
if (__get_token(awk) == -1) return XP_NULL;
nde = __parse_return(awk);
}
else if (MATCH(awk,TOKEN_EXIT))
{
if (__get_token(awk) == -1) return XP_NULL;
nde = __parse_exit(awk);
}
else if (MATCH(awk,TOKEN_DELETE))
{
if (__get_token(awk) == -1) return XP_NULL;
nde = __parse_delete(awk);
}
else if (MATCH(awk,TOKEN_NEXT))
{
if (__get_token(awk) == -1) return XP_NULL;
nde = __parse_next(awk);
}
else if (MATCH(awk,TOKEN_NEXTFILE))
{
if (__get_token(awk) == -1) return XP_NULL;
nde = __parse_nextfile(awk);
}
else if (MATCH(awk,TOKEN_PRINT))
{
if (__get_token(awk) == -1) return XP_NULL;
nde = __parse_print(awk);
}
else if (MATCH(awk,TOKEN_PRINTF))
{
if (__get_token(awk) == -1) return XP_NULL;
nde = __parse_printf(awk);
}
else
{
nde = __parse_expression(awk);
}
if (nde == XP_NULL) return XP_NULL;
/* check if a statement ends with a semicolon */
if (!MATCH(awk,TOKEN_SEMICOLON))
{
if (nde != XP_NULL) xp_awk_clrpt (nde);
PANIC (awk, XP_AWK_ESEMICOLON);
}
/* eat up the semicolon and read in the next token */
if (__get_token(awk) == -1)
{
if (nde != XP_NULL) xp_awk_clrpt (nde);
return XP_NULL;
}
return nde;
}
static xp_awk_nde_t* __parse_expression (xp_awk_t* awk)
{
/*
* <expression> ::= <assignment> | <basic expression>
* <assignment> ::= <assignment target> assignmentOperator <basic expression>
* assignmentOperator ::= '='
* <basic expression> ::=
*/
xp_awk_nde_t* x, * y;
xp_awk_nde_ass_t* nde;
int opcode;
x = __parse_basic_expr (awk);
if (x == XP_NULL) return XP_NULL;
opcode = __assign_to_opcode (awk);
if (opcode == -1) return x;
xp_assert (x->next == XP_NULL);
if (x->type != XP_AWK_NDE_ARG &&
x->type != XP_AWK_NDE_ARGIDX &&
x->type != XP_AWK_NDE_NAMED &&
x->type != XP_AWK_NDE_NAMEDIDX &&
x->type != XP_AWK_NDE_GLOBAL &&
x->type != XP_AWK_NDE_GLOBALIDX &&
x->type != XP_AWK_NDE_LOCAL &&
x->type != XP_AWK_NDE_LOCALIDX &&
x->type != XP_AWK_NDE_POS)
{
xp_awk_clrpt (x);
PANIC (awk, XP_AWK_EASSIGNMENT);
}
if (__get_token(awk) == -1)
{
xp_awk_clrpt (x);
return XP_NULL;
}
y = __parse_basic_expr (awk);
if (y == XP_NULL)
{
xp_awk_clrpt (x);
return XP_NULL;
}
nde = (xp_awk_nde_ass_t*) xp_malloc (xp_sizeof(xp_awk_nde_ass_t));
if (nde == XP_NULL)
{
xp_awk_clrpt (x);
xp_awk_clrpt (y);
PANIC (awk, XP_AWK_ENOMEM);
}
nde->type = XP_AWK_NDE_ASS;
nde->next = XP_NULL;
nde->opcode = opcode;
nde->left = x;
nde->right = y;
return (xp_awk_nde_t*)nde;
}
static xp_awk_nde_t* __parse_basic_expr (xp_awk_t* awk)
{
xp_awk_nde_t* nde, * n1, * n2;
nde = __parse_logical_or (awk);
if (nde == XP_NULL) return XP_NULL;
if (MATCH(awk,TOKEN_QUEST))
{
xp_awk_nde_cnd_t* tmp;
if (__get_token(awk) == -1) return XP_NULL;
n1 = __parse_basic_expr (awk);
if (n1 == XP_NULL)
{
xp_awk_clrpt (nde);
return XP_NULL;
}
if (!MATCH(awk,TOKEN_COLON)) PANIC (awk, XP_AWK_ECOLON);
if (__get_token(awk) == -1) return XP_NULL;
n2 = __parse_basic_expr (awk);
if (n2 == XP_NULL)
{
xp_awk_clrpt (nde);
xp_awk_clrpt (n1);
return XP_NULL;
}
tmp = (xp_awk_nde_cnd_t*)
xp_malloc (xp_sizeof(xp_awk_nde_cnd_t));
if (tmp == XP_NULL)
{
xp_awk_clrpt (nde);
xp_awk_clrpt (n1);
xp_awk_clrpt (n2);
return XP_NULL;
}
tmp->type = XP_AWK_NDE_CND;
tmp->next = XP_NULL;
tmp->test = nde;
tmp->left = n1;
tmp->right = n2;
nde = (xp_awk_nde_t*)tmp;
}
return nde;
}
static xp_awk_nde_t* __parse_binary_expr (
xp_awk_t* awk, const __binmap_t* binmap,
xp_awk_nde_t*(*next_level_func)(xp_awk_t*))
{
xp_awk_nde_exp_t* nde;
xp_awk_nde_t* left, * right;
int opcode;
left = next_level_func (awk);
if (left == XP_NULL) return XP_NULL;
while (1)
{
const __binmap_t* p = binmap;
xp_bool_t matched = xp_false;
while (p->token != TOKEN_EOF)
{
if (MATCH(awk,p->token))
{
opcode = p->binop;
matched = xp_true;
break;
}
p++;
}
if (!matched) break;
if (__get_token(awk) == -1)
{
xp_awk_clrpt (left);
return XP_NULL;
}
right = next_level_func (awk);
if (right == XP_NULL)
{
xp_awk_clrpt (left);
return XP_NULL;
}
/* TODO: enhance constant folding. do it in a better way */
/* TODO: differentiate different types of numbers ... */
if (left->type == XP_AWK_NDE_INT &&
right->type == XP_AWK_NDE_INT)
{
xp_long_t l, r;
l = ((xp_awk_nde_int_t*)left)->val;
r = ((xp_awk_nde_int_t*)right)->val;
/* TODO: more operators */
if (opcode == XP_AWK_BINOP_PLUS) l += r;
else if (opcode == XP_AWK_BINOP_MINUS) l -= r;
else if (opcode == XP_AWK_BINOP_MUL) l *= r;
else if (opcode == XP_AWK_BINOP_DIV && r != 0) l /= r;
else if (opcode == XP_AWK_BINOP_MOD && r != 0) l %= r;
else goto skip_constant_folding;
xp_awk_clrpt (right);
((xp_awk_nde_int_t*)left)->val = l;
continue;
}
else if (left->type == XP_AWK_NDE_REAL &&
right->type == XP_AWK_NDE_REAL)
{
xp_real_t l, r;
l = ((xp_awk_nde_real_t*)left)->val;
r = ((xp_awk_nde_real_t*)right)->val;
/* TODO: more operators */
if (opcode == XP_AWK_BINOP_PLUS) l += r;
else if (opcode == XP_AWK_BINOP_MINUS) l -= r;
else if (opcode == XP_AWK_BINOP_MUL) l *= r;
else if (opcode == XP_AWK_BINOP_DIV) l /= r;
else goto skip_constant_folding;
xp_awk_clrpt (right);
((xp_awk_nde_real_t*)left)->val = l;
continue;
}
/* TODO: enhance constant folding more... */
skip_constant_folding:
nde = (xp_awk_nde_exp_t*)
xp_malloc (xp_sizeof(xp_awk_nde_exp_t));
if (nde == XP_NULL)
{
xp_awk_clrpt (right);
xp_awk_clrpt (left);
PANIC (awk, XP_AWK_ENOMEM);
}
nde->type = XP_AWK_NDE_EXP_BIN;
nde->next = XP_NULL;
nde->opcode = opcode;
nde->left = left;
nde->right = right;
left = (xp_awk_nde_t*)nde;
}
return left;
}
static xp_awk_nde_t* __parse_logical_or (xp_awk_t* awk)
{
static __binmap_t map[] =
{
{ TOKEN_LOR, XP_AWK_BINOP_LOR },
{ TOKEN_EOF, 0 }
};
return __parse_binary_expr (awk, map, __parse_logical_and);
}
static xp_awk_nde_t* __parse_logical_and (xp_awk_t* awk)
{
static __binmap_t map[] =
{
{ TOKEN_LAND, XP_AWK_BINOP_LAND },
{ TOKEN_EOF, 0 }
};
return __parse_binary_expr (awk, map, __parse_in);
}
static xp_awk_nde_t* __parse_in (xp_awk_t* awk)
{
/*
static __binmap_t map[] =
{
{ TOKEN_IN, XP_AWK_BINOP_IN },
{ TOKEN_EOF, 0 }
};
return __parse_binary_expr (awk, map, __parse_regex_match);
*/
xp_awk_nde_exp_t* nde;
xp_awk_nde_t* left, * right;
left = __parse_regex_match (awk);
if (left == XP_NULL) return XP_NULL;
while (1)
{
if (!MATCH(awk,TOKEN_IN)) break;
if (__get_token(awk) == -1)
{
xp_awk_clrpt (left);
return XP_NULL;
}
right = __parse_regex_match (awk);
if (right == XP_NULL)
{
xp_awk_clrpt (left);
return XP_NULL;
}
if (!__is_plain_var(right))
{
xp_awk_clrpt (right);
xp_awk_clrpt (left);
PANIC (awk, XP_AWK_ENOTVAR);
}
nde = (xp_awk_nde_exp_t*)
xp_malloc (xp_sizeof(xp_awk_nde_exp_t));
if (nde == XP_NULL)
{
xp_awk_clrpt (right);
xp_awk_clrpt (left);
PANIC (awk, XP_AWK_ENOMEM);
}
nde->type = XP_AWK_NDE_EXP_BIN;
nde->next = XP_NULL;
nde->opcode = XP_AWK_BINOP_IN;
nde->left = left;
nde->right = right;
left = (xp_awk_nde_t*)nde;
}
return left;
}
static xp_awk_nde_t* __parse_regex_match (xp_awk_t* awk)
{
static __binmap_t map[] =
{
{ TOKEN_TILDE, XP_AWK_BINOP_MA },
{ TOKEN_NM, XP_AWK_BINOP_NM },
{ TOKEN_EOF, 0 },
};
return __parse_binary_expr (awk, map, __parse_bitwise_or);
}
static xp_awk_nde_t* __parse_bitwise_or (xp_awk_t* awk)
{
if (awk->opt.parse & XP_AWK_EXTIO)
{
return __parse_bitwise_or_with_extio (awk);
}
else
{
static __binmap_t map[] =
{
{ TOKEN_BOR, XP_AWK_BINOP_BOR },
{ TOKEN_EOF, 0 }
};
return __parse_binary_expr (awk, map, __parse_bitwise_xor);
}
}
static xp_awk_nde_t* __parse_bitwise_or_with_extio (xp_awk_t* awk)
{
xp_awk_nde_t* left, * right;
left = __parse_bitwise_xor (awk);
if (left == XP_NULL) return XP_NULL;
while (1)
{
int in_type;
if (MATCH(awk,TOKEN_BOR))
in_type = XP_AWK_GETLINE_PIPE;
else if (MATCH(awk,TOKEN_BORAND))
in_type = XP_AWK_GETLINE_COPROC;
else break;
if (__get_token(awk) == -1)
{
xp_awk_clrpt (left);
return XP_NULL;
}
if (MATCH(awk,TOKEN_GETLINE))
{
xp_awk_nde_getline_t* nde;
xp_awk_nde_t* var = XP_NULL;
/* piped getline */
if (__get_token(awk) == -1)
{
xp_awk_clrpt (left);
return XP_NULL;
}
/* TODO: is this correct? */
if (MATCH(awk,TOKEN_IDENT))
{
/* command | getline var */
var = __parse_primary (awk);
if (var == XP_NULL)
{
xp_awk_clrpt (left);
return XP_NULL;
}
}
nde = (xp_awk_nde_getline_t*)
xp_malloc (xp_sizeof(xp_awk_nde_getline_t));
if (nde == XP_NULL)
{
xp_awk_clrpt (left);
PANIC (awk, XP_AWK_ENOMEM);
}
nde->type = XP_AWK_NDE_GETLINE;
nde->next = XP_NULL;
nde->var = var;
nde->in_type = in_type;
nde->in = left;
left = (xp_awk_nde_t*)nde;
}
else
{
xp_awk_nde_exp_t* nde;
if (in_type == XP_AWK_GETLINE_COPROC)
{
xp_awk_clrpt (left);
PANIC (awk, XP_AWK_EGETLINE);
}
right = __parse_bitwise_xor (awk);
if (right == XP_NULL)
{
xp_awk_clrpt (left);
return XP_NULL;
}
/* TODO: some constant folding */
nde = (xp_awk_nde_exp_t*)
xp_malloc (xp_sizeof(xp_awk_nde_exp_t));
if (nde == XP_NULL)
{
xp_awk_clrpt (right);
xp_awk_clrpt (left);
PANIC (awk, XP_AWK_ENOMEM);
}
nde->type = XP_AWK_NDE_EXP_BIN;
nde->next = XP_NULL;
nde->opcode = XP_AWK_BINOP_BOR;
nde->left = left;
nde->right = right;
left = (xp_awk_nde_t*)nde;
}
}
return left;
}
static xp_awk_nde_t* __parse_bitwise_xor (xp_awk_t* awk)
{
static __binmap_t map[] =
{
{ TOKEN_BXOR, XP_AWK_BINOP_BXOR },
{ TOKEN_EOF, 0 }
};
return __parse_binary_expr (awk, map, __parse_bitwise_and);
}
static xp_awk_nde_t* __parse_bitwise_and (xp_awk_t* awk)
{
static __binmap_t map[] =
{
{ TOKEN_BAND, XP_AWK_BINOP_BAND },
{ TOKEN_EOF, 0 }
};
return __parse_binary_expr (awk, map, __parse_equality);
}
static xp_awk_nde_t* __parse_equality (xp_awk_t* awk)
{
static __binmap_t map[] =
{
{ TOKEN_EQ, XP_AWK_BINOP_EQ },
{ TOKEN_NE, XP_AWK_BINOP_NE },
{ TOKEN_EOF, 0 }
};
return __parse_binary_expr (awk, map, __parse_relational);
}
static xp_awk_nde_t* __parse_relational (xp_awk_t* awk)
{
static __binmap_t map[] =
{
{ TOKEN_GT, XP_AWK_BINOP_GT },
{ TOKEN_GE, XP_AWK_BINOP_GE },
{ TOKEN_LT, XP_AWK_BINOP_LT },
{ TOKEN_LE, XP_AWK_BINOP_LE },
{ TOKEN_EOF, 0 }
};
return __parse_binary_expr (awk, map, __parse_shift);
}
static xp_awk_nde_t* __parse_shift (xp_awk_t* awk)
{
static __binmap_t map[] =
{
{ TOKEN_LSHIFT, XP_AWK_BINOP_LSHIFT },
{ TOKEN_RSHIFT, XP_AWK_BINOP_RSHIFT },
{ TOKEN_EOF, 0 }
};
return __parse_binary_expr (awk, map, __parse_additive);
}
static xp_awk_nde_t* __parse_additive (xp_awk_t* awk)
{
static __binmap_t map[] =
{
{ TOKEN_PLUS, XP_AWK_BINOP_PLUS },
{ TOKEN_MINUS, XP_AWK_BINOP_MINUS },
{ TOKEN_EOF, 0 }
};
return __parse_binary_expr (awk, map, __parse_multiplicative);
}
static xp_awk_nde_t* __parse_multiplicative (xp_awk_t* awk)
{
static __binmap_t map[] =
{
{ TOKEN_MUL, XP_AWK_BINOP_MUL },
{ TOKEN_DIV, XP_AWK_BINOP_DIV },
{ TOKEN_MOD, XP_AWK_BINOP_MOD },
{ TOKEN_EXP, XP_AWK_BINOP_EXP },
{ TOKEN_EOF, 0 }
};
return __parse_binary_expr (awk, map, __parse_unary);
}
static xp_awk_nde_t* __parse_unary (xp_awk_t* awk)
{
xp_awk_nde_exp_t* nde;
xp_awk_nde_t* left;
int opcode;
opcode = (MATCH(awk,TOKEN_PLUS))? XP_AWK_UNROP_PLUS:
(MATCH(awk,TOKEN_MINUS))? XP_AWK_UNROP_MINUS:
(MATCH(awk,TOKEN_NOT))? XP_AWK_UNROP_NOT:
(MATCH(awk,TOKEN_TILDE))? XP_AWK_UNROP_BNOT: -1;
if (opcode == -1) return __parse_increment (awk);
if (__get_token(awk) == -1) return XP_NULL;
left = __parse_unary (awk);
if (left == XP_NULL) return XP_NULL;
nde = (xp_awk_nde_exp_t*)
xp_malloc (xp_sizeof(xp_awk_nde_exp_t));
if (nde == XP_NULL)
{
xp_awk_clrpt (left);
PANIC (awk, XP_AWK_ENOMEM);
}
nde->type = XP_AWK_NDE_EXP_UNR;
nde->next = XP_NULL;
nde->opcode = opcode;
nde->left = left;
nde->right = XP_NULL;
return (xp_awk_nde_t*)nde;
}
static xp_awk_nde_t* __parse_increment (xp_awk_t* awk)
{
xp_awk_nde_exp_t* nde;
xp_awk_nde_t* left;
int type, opcode, opcode1, opcode2;
opcode1 = MATCH(awk,TOKEN_PLUSPLUS)? XP_AWK_INCOP_PLUS:
MATCH(awk,TOKEN_MINUSMINUS)? XP_AWK_INCOP_MINUS: -1;
if (opcode1 != -1)
{
if (__get_token(awk) == -1) return XP_NULL;
}
left = __parse_primary (awk);
if (left == XP_NULL) return XP_NULL;
opcode2 = MATCH(awk,TOKEN_PLUSPLUS)? XP_AWK_INCOP_PLUS:
MATCH(awk,TOKEN_MINUSMINUS)? XP_AWK_INCOP_MINUS: -1;
if (opcode1 != -1 && opcode2 != -1)
{
xp_awk_clrpt (left);
PANIC (awk, XP_AWK_ELVALUE);
}
else if (opcode1 == -1 && opcode2 == -1)
{
return left;
}
else if (opcode1 != -1)
{
type = XP_AWK_NDE_EXP_INCPRE;
opcode = opcode1;
}
else if (opcode2 != -1)
{
type = XP_AWK_NDE_EXP_INCPST;
opcode = opcode2;
if (__get_token(awk) == -1) return XP_NULL;
}
nde = (xp_awk_nde_exp_t*)
xp_malloc (xp_sizeof(xp_awk_nde_exp_t));
if (nde == XP_NULL)
{
xp_awk_clrpt (left);
PANIC (awk, XP_AWK_ENOMEM);
}
nde->type = type;
nde->next = XP_NULL;
nde->opcode = opcode;
nde->left = left;
nde->right = XP_NULL;
return (xp_awk_nde_t*)nde;
}
static xp_awk_nde_t* __parse_primary (xp_awk_t* awk)
{
if (MATCH(awk,TOKEN_IDENT))
{
return __parse_primary_ident (awk);
}
else if (MATCH(awk,TOKEN_INT))
{
xp_awk_nde_int_t* nde;
nde = (xp_awk_nde_int_t*)
xp_malloc (xp_sizeof(xp_awk_nde_int_t));
if (nde == XP_NULL) PANIC (awk, XP_AWK_ENOMEM);
nde->type = XP_AWK_NDE_INT;
nde->next = XP_NULL;
nde->val = xp_awk_strtolong (
XP_STR_BUF(&awk->token.name), 0, XP_NULL);
xp_assert (
XP_STR_LEN(&awk->token.name) ==
xp_strlen(XP_STR_BUF(&awk->token.name)));
if (__get_token(awk) == -1)
{
xp_free (nde);
return XP_NULL;
}
return (xp_awk_nde_t*)nde;
}
else if (MATCH(awk,TOKEN_REAL))
{
xp_awk_nde_real_t* nde;
nde = (xp_awk_nde_real_t*)
xp_malloc (xp_sizeof(xp_awk_nde_real_t));
if (nde == XP_NULL) PANIC (awk, XP_AWK_ENOMEM);
nde->type = XP_AWK_NDE_REAL;
nde->next = XP_NULL;
nde->val = xp_awk_strtoreal (XP_STR_BUF(&awk->token.name));
xp_assert (
XP_STR_LEN(&awk->token.name) ==
xp_strlen(XP_STR_BUF(&awk->token.name)));
if (__get_token(awk) == -1)
{
xp_free (nde);
return XP_NULL;
}
return (xp_awk_nde_t*)nde;
}
else if (MATCH(awk,TOKEN_STR))
{
xp_awk_nde_str_t* nde;
nde = (xp_awk_nde_str_t*)
xp_malloc (xp_sizeof(xp_awk_nde_str_t));
if (nde == XP_NULL) PANIC (awk, XP_AWK_ENOMEM);
nde->type = XP_AWK_NDE_STR;
nde->next = XP_NULL;
nde->len = XP_STR_LEN(&awk->token.name);
nde->buf = xp_strxdup(XP_STR_BUF(&awk->token.name), nde->len);
if (nde->buf == XP_NULL)
{
xp_free (nde);
PANIC (awk, XP_AWK_ENOMEM);
}
if (__get_token(awk) == -1)
{
xp_free (nde->buf);
xp_free (nde);
return XP_NULL;
}
return (xp_awk_nde_t*)nde;
}
else if (MATCH(awk,TOKEN_DIV))
{
xp_awk_nde_str_t* nde;
/* the regular expression is tokenized because of
* context-sensitivity of the slash symbol */
SET_TOKEN_TYPE (awk, TOKEN_REX);
if (__get_regex(awk) == -1) return XP_NULL;
xp_assert (MATCH(awk,TOKEN_REX));
nde = (xp_awk_nde_str_t*)
xp_malloc (xp_sizeof(xp_awk_nde_rex_t));
if (nde == XP_NULL) PANIC (awk, XP_AWK_ENOMEM);
nde->type = XP_AWK_NDE_REX;
nde->next = XP_NULL;
nde->len = XP_STR_LEN(&awk->token.name);
nde->buf = xp_strxdup(XP_STR_BUF(&awk->token.name), nde->len);
if (nde->buf == XP_NULL)
{
xp_free (nde);
PANIC (awk, XP_AWK_ENOMEM);
}
if (__get_token(awk) == -1)
{
xp_free (nde->buf);
xp_free (nde);
return XP_NULL;
}
return (xp_awk_nde_t*)nde;
}
else if (MATCH(awk,TOKEN_DOLLAR))
{
xp_awk_nde_pos_t* nde;
xp_awk_nde_t* prim;
if (__get_token(awk)) return XP_NULL;
prim = __parse_primary (awk);
if (prim == XP_NULL) return XP_NULL;
nde = (xp_awk_nde_pos_t*)
xp_malloc (xp_sizeof(xp_awk_nde_pos_t));
if (nde == XP_NULL)
{
xp_awk_clrpt (prim);
PANIC (awk, XP_AWK_ENOMEM);
}
nde->type = XP_AWK_NDE_POS;
nde->next = XP_NULL;
nde->val = prim;
return (xp_awk_nde_t*)nde;
}
else if (MATCH(awk,TOKEN_LPAREN))
{
xp_awk_nde_t* nde;
xp_awk_nde_t* last;
/* eat up the left parenthesis */
if (__get_token(awk) == -1) return XP_NULL;
/* parse the sub-expression inside the parentheses */
nde = __parse_expression (awk);
if (nde == XP_NULL) return XP_NULL;
/* parse subsequent expressions separated by a comma, if any */
last = nde;
xp_assert (last->next == XP_NULL);
while (MATCH(awk,TOKEN_COMMA))
{
xp_awk_nde_t* tmp;
if (__get_token(awk) == -1)
{
xp_awk_clrpt (nde);
return XP_NULL;
}
tmp = __parse_expression (awk);
if (tmp == XP_NULL)
{
xp_awk_clrpt (nde);
return XP_NULL;
}
xp_assert (tmp->next == XP_NULL);
last->next = tmp;
last = tmp;
}
/* ----------------- */
/* check for the closing parenthesis */
if (!MATCH(awk,TOKEN_RPAREN))
{
xp_awk_clrpt (nde);
PANIC (awk, XP_AWK_ERPAREN);
}
if (__get_token(awk) == -1)
{
xp_awk_clrpt (nde);
return XP_NULL;
}
/* check if it is a chained node */
if (nde->next != XP_NULL)
{
/* if so, it is a expression group */
/* (expr1, expr2, expr2) */
xp_awk_nde_grp_t* tmp;
if (!MATCH(awk,TOKEN_IN))
{
xp_awk_clrpt (nde);
PANIC (awk, XP_AWK_EIN);
}
tmp = (xp_awk_nde_grp_t*)
xp_malloc (xp_sizeof(xp_awk_nde_grp_t));
if (tmp == XP_NULL)
{
xp_awk_clrpt (nde);
PANIC (awk, XP_AWK_ENOMEM);
}
tmp->type = XP_AWK_NDE_GRP;
tmp->next = XP_NULL;
tmp->body = nde;
nde = (xp_awk_nde_t*)tmp;
}
/* ----------------- */
return nde;
}
else if (MATCH(awk,TOKEN_GETLINE))
{
xp_awk_nde_getline_t* nde;
xp_awk_nde_t* var = XP_NULL;
xp_awk_nde_t* in = XP_NULL;
if (__get_token(awk) == -1) return XP_NULL;
if (MATCH(awk,TOKEN_IDENT))
{
/* getline var */
var = __parse_primary (awk);
if (var == XP_NULL) return XP_NULL;
}
if (MATCH(awk, TOKEN_LT))
{
/* getline [var] < file */
if (__get_token(awk) == -1)
{
if (var != XP_NULL) xp_awk_clrpt (var);
return XP_NULL;
}
in = __parse_expression (awk);
if (in == XP_NULL)
{
if (var != XP_NULL) xp_awk_clrpt (var);
return XP_NULL;
}
}
nde = (xp_awk_nde_getline_t*)
xp_malloc (xp_sizeof(xp_awk_nde_getline_t));
if (nde == XP_NULL)
{
if (var != XP_NULL) xp_awk_clrpt (var);
if (in != XP_NULL) xp_awk_clrpt (in);
PANIC (awk, XP_AWK_ENOMEM);
}
nde->type = XP_AWK_NDE_GETLINE;
nde->next = XP_NULL;
nde->var = var;
nde->in_type = XP_AWK_GETLINE_FILE;
nde->in = in;
return (xp_awk_nde_t*)nde;
}
/* valid expression introducer is expected */
PANIC (awk, XP_AWK_EEXPRESSION);
}
static xp_awk_nde_t* __parse_primary_ident (xp_awk_t* awk)
{
xp_char_t* name_dup;
xp_awk_bfn_t* bfn;
xp_assert (MATCH(awk,TOKEN_IDENT));
name_dup = (xp_char_t*)xp_strdup(XP_STR_BUF(&awk->token.name));
if (name_dup == XP_NULL) PANIC (awk, XP_AWK_ENOMEM);
if (__get_token(awk) == -1)
{
xp_free (name_dup);
return XP_NULL;
}
/* what if name_dup is a built-in function name */
bfn = xp_awk_getbfn (awk, name_dup);
if (bfn != XP_NULL)
{
xp_awk_nde_t* nde;
xp_free (name_dup);
if (!MATCH(awk,TOKEN_LPAREN))
{
/* built-in function should be in the form
* of the function call */
PANIC (awk, XP_AWK_ELPAREN);
}
nde = __parse_fncall (awk, XP_NULL, bfn);
return (xp_awk_nde_t*)nde;
}
/* now we know that name_dup is a normal identifier. */
if (MATCH(awk,TOKEN_LBRACK))
{
xp_awk_nde_t* nde;
nde = __parse_hashidx (awk, name_dup);
if (nde == XP_NULL) xp_free (name_dup);
return (xp_awk_nde_t*)nde;
}
else if (MATCH(awk,TOKEN_LPAREN))
{
/* function call */
xp_awk_nde_t* nde;
nde = __parse_fncall (awk, name_dup, XP_NULL);
if (nde == XP_NULL) xp_free (name_dup);
return (xp_awk_nde_t*)nde;
}
else
{
/* normal variable */
xp_awk_nde_var_t* nde;
xp_size_t idxa;
nde = (xp_awk_nde_var_t*)
xp_malloc (xp_sizeof(xp_awk_nde_var_t));
if (nde == XP_NULL)
{
xp_free (name_dup);
PANIC (awk, XP_AWK_ENOMEM);
}
/* search the parameter name list */
idxa = xp_awk_tab_find(&awk->parse.params, name_dup, 0);
if (idxa != (xp_size_t)-1)
{
nde->type = XP_AWK_NDE_ARG;
nde->next = XP_NULL;
/*nde->id.name = XP_NULL;*/
nde->id.name = name_dup;
nde->id.idxa = idxa;
nde->idx = XP_NULL;
return (xp_awk_nde_t*)nde;
}
/* search the local variable list */
idxa = xp_awk_tab_rrfind(&awk->parse.locals, name_dup, 0);
if (idxa != (xp_size_t)-1)
{
nde->type = XP_AWK_NDE_LOCAL;
nde->next = XP_NULL;
/*nde->id.name = XP_NULL;*/
nde->id.name = name_dup;
nde->id.idxa = idxa;
nde->idx = XP_NULL;
return (xp_awk_nde_t*)nde;
}
/* search the global variable list */
idxa = xp_awk_tab_rrfind(&awk->parse.globals, name_dup, 0);
if (idxa != (xp_size_t)-1)
{
nde->type = XP_AWK_NDE_GLOBAL;
nde->next = XP_NULL;
/*nde->id.name = XP_NULL;*/
nde->id.name = name_dup;
nde->id.idxa = idxa;
nde->idx = XP_NULL;
return (xp_awk_nde_t*)nde;
}
if (awk->opt.parse & XP_AWK_IMPLICIT)
{
nde->type = XP_AWK_NDE_NAMED;
nde->next = XP_NULL;
nde->id.name = name_dup;
nde->id.idxa = (xp_size_t)-1;
nde->idx = XP_NULL;
return (xp_awk_nde_t*)nde;
}
/* undefined variable */
xp_free (name_dup);
xp_free (nde);
PANIC (awk, XP_AWK_EUNDEF);
}
}
static xp_awk_nde_t* __parse_hashidx (xp_awk_t* awk, xp_char_t* name)
{
xp_awk_nde_t* idx, * tmp, * last;
xp_awk_nde_var_t* nde;
xp_size_t idxa;
idx = XP_NULL;
last = XP_NULL;
do
{
if (__get_token(awk) == -1)
{
if (idx != XP_NULL) xp_awk_clrpt (idx);
return XP_NULL;
}
tmp = __parse_expression (awk);
if (tmp == XP_NULL)
{
if (idx != XP_NULL) xp_awk_clrpt (idx);
return XP_NULL;
}
if (idx == XP_NULL)
{
xp_assert (last == XP_NULL);
idx = tmp; last = tmp;
}
else
{
last->next = tmp;
last = tmp;
}
}
while (MATCH(awk,TOKEN_COMMA));
xp_assert (idx != XP_NULL);
if (!MATCH(awk,TOKEN_RBRACK))
{
xp_awk_clrpt (idx);
PANIC (awk, XP_AWK_ERBRACK);
}
if (__get_token(awk) == -1)
{
xp_awk_clrpt (idx);
return XP_NULL;
}
nde = (xp_awk_nde_var_t*) xp_malloc (xp_sizeof(xp_awk_nde_var_t));
if (nde == XP_NULL)
{
xp_awk_clrpt (idx);
PANIC (awk, XP_AWK_ENOMEM);
}
/* search the parameter name list */
idxa = xp_awk_tab_find (&awk->parse.params, name, 0);
if (idxa != (xp_size_t)-1)
{
nde->type = XP_AWK_NDE_ARGIDX;
nde->next = XP_NULL;
/*nde->id.name = XP_NULL; */
nde->id.name = name;
nde->id.idxa = idxa;
nde->idx = idx;
return (xp_awk_nde_t*)nde;
}
/* search the local variable list */
idxa = xp_awk_tab_rrfind(&awk->parse.locals, name, 0);
if (idxa != (xp_size_t)-1)
{
nde->type = XP_AWK_NDE_LOCALIDX;
nde->next = XP_NULL;
/*nde->id.name = XP_NULL; */
nde->id.name = name;
nde->id.idxa = idxa;
nde->idx = idx;
return (xp_awk_nde_t*)nde;
}
/* search the global variable list */
idxa = xp_awk_tab_rrfind(&awk->parse.globals, name, 0);
if (idxa != (xp_size_t)-1)
{
nde->type = XP_AWK_NDE_GLOBALIDX;
nde->next = XP_NULL;
/*nde->id.name = XP_NULL;*/
nde->id.name = name;
nde->id.idxa = idxa;
nde->idx = idx;
return (xp_awk_nde_t*)nde;
}
if (awk->opt.parse & XP_AWK_IMPLICIT)
{
nde->type = XP_AWK_NDE_NAMEDIDX;
nde->next = XP_NULL;
nde->id.name = name;
nde->id.idxa = (xp_size_t)-1;
nde->idx = idx;
return (xp_awk_nde_t*)nde;
}
/* undefined variable */
xp_awk_clrpt (idx);
xp_free (nde);
PANIC (awk, XP_AWK_EUNDEF);
}
static xp_awk_nde_t* __parse_fncall (
xp_awk_t* awk, xp_char_t* name, xp_awk_bfn_t* bfn)
{
xp_awk_nde_t* head, * curr, * nde;
xp_awk_nde_call_t* call;
xp_size_t nargs;
if (__get_token(awk) == -1) return XP_NULL;
head = curr = XP_NULL;
nargs = 0;
if (MATCH(awk,TOKEN_RPAREN))
{
/* no parameters to the function call */
if (__get_token(awk) == -1) return XP_NULL;
}
else
{
while (1)
{
nde = __parse_expression (awk);
if (nde == XP_NULL)
{
if (head != XP_NULL) xp_awk_clrpt (head);
return XP_NULL;
}
if (head == XP_NULL) head = nde;
else curr->next = nde;
curr = nde;
nargs++;
if (MATCH(awk,TOKEN_RPAREN))
{
if (__get_token(awk) == -1)
{
if (head != XP_NULL) xp_awk_clrpt (head);
return XP_NULL;
}
break;
}
if (!MATCH(awk,TOKEN_COMMA))
{
if (head != XP_NULL) xp_awk_clrpt (head);
PANIC (awk, XP_AWK_ECOMMA);
}
if (__get_token(awk) == -1)
{
if (head != XP_NULL) xp_awk_clrpt (head);
return XP_NULL;
}
}
}
call = (xp_awk_nde_call_t*) xp_malloc (xp_sizeof(xp_awk_nde_call_t));
if (call == XP_NULL)
{
if (head != XP_NULL) xp_awk_clrpt (head);
PANIC (awk, XP_AWK_ENOMEM);
}
if (bfn != XP_NULL)
{
call->type = XP_AWK_NDE_BFN;
call->next = XP_NULL;
call->what.bfn = bfn;
call->args = head;
call->nargs = nargs;
}
else
{
call->type = XP_AWK_NDE_UFN;
call->next = XP_NULL;
call->what.name = name;
call->args = head;
call->nargs = nargs;
}
return (xp_awk_nde_t*)call;
}
static xp_awk_nde_t* __parse_if (xp_awk_t* awk)
{
xp_awk_nde_t* test;
xp_awk_nde_t* then_part;
xp_awk_nde_t* else_part;
xp_awk_nde_if_t* nde;
if (!MATCH(awk,TOKEN_LPAREN)) PANIC (awk, XP_AWK_ELPAREN);
if (__get_token(awk) == -1) return XP_NULL;
test = __parse_expression (awk);
if (test == XP_NULL) return XP_NULL;
if (!MATCH(awk,TOKEN_RPAREN))
{
xp_awk_clrpt (test);
PANIC (awk, XP_AWK_ERPAREN);
}
if (__get_token(awk) == -1)
{
xp_awk_clrpt (test);
return XP_NULL;
}
then_part = __parse_statement (awk);
if (then_part == XP_NULL)
{
xp_awk_clrpt (test);
return XP_NULL;
}
if (MATCH(awk,TOKEN_ELSE))
{
if (__get_token(awk) == -1)
{
xp_awk_clrpt (then_part);
xp_awk_clrpt (test);
return XP_NULL;
}
else_part = __parse_statement (awk);
if (else_part == XP_NULL)
{
xp_awk_clrpt (then_part);
xp_awk_clrpt (test);
return XP_NULL;
}
}
else else_part = XP_NULL;
nde = (xp_awk_nde_if_t*) xp_malloc (xp_sizeof(xp_awk_nde_if_t));
if (nde == XP_NULL)
{
xp_awk_clrpt (else_part);
xp_awk_clrpt (then_part);
xp_awk_clrpt (test);
PANIC (awk, XP_AWK_ENOMEM);
}
nde->type = XP_AWK_NDE_IF;
nde->next = XP_NULL;
nde->test = test;
nde->then_part = then_part;
nde->else_part = else_part;
return (xp_awk_nde_t*)nde;
}
static xp_awk_nde_t* __parse_while (xp_awk_t* awk)
{
xp_awk_nde_t* test, * body;
xp_awk_nde_while_t* nde;
if (!MATCH(awk,TOKEN_LPAREN)) PANIC (awk, XP_AWK_ELPAREN);
if (__get_token(awk) == -1) return XP_NULL;
test = __parse_expression (awk);
if (test == XP_NULL) return XP_NULL;
if (!MATCH(awk,TOKEN_RPAREN))
{
xp_awk_clrpt (test);
PANIC (awk, XP_AWK_ERPAREN);
}
if (__get_token(awk) == -1)
{
xp_awk_clrpt (test);
return XP_NULL;
}
body = __parse_statement (awk);
if (body == XP_NULL)
{
xp_awk_clrpt (test);
return XP_NULL;
}
nde = (xp_awk_nde_while_t*) xp_malloc (xp_sizeof(xp_awk_nde_while_t));
if (nde == XP_NULL)
{
xp_awk_clrpt (body);
xp_awk_clrpt (test);
PANIC (awk, XP_AWK_ENOMEM);
}
nde->type = XP_AWK_NDE_WHILE;
nde->next = XP_NULL;
nde->test = test;
nde->body = body;
return (xp_awk_nde_t*)nde;
}
static xp_awk_nde_t* __parse_for (xp_awk_t* awk)
{
xp_awk_nde_t* init, * test, * incr, * body;
xp_awk_nde_for_t* nde;
xp_awk_nde_foreach_t* nde2;
if (!MATCH(awk,TOKEN_LPAREN)) PANIC (awk, XP_AWK_ELPAREN);
if (__get_token(awk) == -1) return XP_NULL;
if (MATCH(awk,TOKEN_SEMICOLON)) init = XP_NULL;
else
{
/* this line is very ugly. it checks the entire next
* expression or the first element in the expression
* is wrapped by a parenthesis */
int no_foreach = MATCH(awk,TOKEN_LPAREN);
init = __parse_expression (awk);
if (init == XP_NULL) return XP_NULL;
if (!no_foreach && init->type == XP_AWK_NDE_EXP_BIN &&
((xp_awk_nde_exp_t*)init)->opcode == XP_AWK_BINOP_IN &&
__is_plain_var(((xp_awk_nde_exp_t*)init)->left))
{
/* switch to foreach */
if (!MATCH(awk,TOKEN_RPAREN))
{
xp_awk_clrpt (init);
PANIC (awk, XP_AWK_ERPAREN);
}
if (__get_token(awk) == -1)
{
xp_awk_clrpt (init);
return XP_NULL;
}
body = __parse_statement (awk);
if (body == XP_NULL)
{
xp_awk_clrpt (init);
return XP_NULL;
}
nde2 = (xp_awk_nde_foreach_t*)
xp_malloc (xp_sizeof(xp_awk_nde_foreach_t));
if (nde2 == XP_NULL)
{
xp_awk_clrpt (init);
xp_awk_clrpt (body);
PANIC (awk, XP_AWK_ENOMEM);
}
nde2->type = XP_AWK_NDE_FOREACH;
nde2->next = XP_NULL;
nde2->test = init;
nde2->body = body;
return (xp_awk_nde_t*)nde2;
}
if (!MATCH(awk,TOKEN_SEMICOLON))
{
xp_awk_clrpt (init);
PANIC (awk, XP_AWK_ESEMICOLON);
}
}
if (__get_token(awk) == -1)
{
xp_awk_clrpt (init);
return XP_NULL;
}
if (MATCH(awk,TOKEN_SEMICOLON)) test = XP_NULL;
else
{
test = __parse_expression (awk);
if (test == XP_NULL)
{
xp_awk_clrpt (init);
return XP_NULL;
}
if (!MATCH(awk,TOKEN_SEMICOLON))
{
xp_awk_clrpt (init);
xp_awk_clrpt (test);
PANIC (awk, XP_AWK_ESEMICOLON);
}
}
if (__get_token(awk) == -1)
{
xp_awk_clrpt (init);
xp_awk_clrpt (test);
return XP_NULL;
}
if (MATCH(awk,TOKEN_RPAREN)) incr = XP_NULL;
else
{
incr = __parse_expression (awk);
if (incr == XP_NULL)
{
xp_awk_clrpt (init);
xp_awk_clrpt (test);
return XP_NULL;
}
if (!MATCH(awk,TOKEN_RPAREN))
{
xp_awk_clrpt (init);
xp_awk_clrpt (test);
xp_awk_clrpt (incr);
PANIC (awk, XP_AWK_ERPAREN);
}
}
if (__get_token(awk) == -1)
{
xp_awk_clrpt (init);
xp_awk_clrpt (test);
xp_awk_clrpt (incr);
return XP_NULL;
}
body = __parse_statement (awk);
if (body == XP_NULL)
{
xp_awk_clrpt (init);
xp_awk_clrpt (test);
xp_awk_clrpt (incr);
return XP_NULL;
}
nde = (xp_awk_nde_for_t*) xp_malloc (xp_sizeof(xp_awk_nde_for_t));
if (nde == XP_NULL)
{
xp_awk_clrpt (init);
xp_awk_clrpt (test);
xp_awk_clrpt (incr);
xp_awk_clrpt (body);
PANIC (awk, XP_AWK_ENOMEM);
}
nde->type = XP_AWK_NDE_FOR;
nde->next = XP_NULL;
nde->init = init;
nde->test = test;
nde->incr = incr;
nde->body = body;
return (xp_awk_nde_t*)nde;
}
static xp_awk_nde_t* __parse_dowhile (xp_awk_t* awk)
{
xp_awk_nde_t* test, * body;
xp_awk_nde_while_t* nde;
body = __parse_statement (awk);
if (body == XP_NULL) return XP_NULL;
if (!MATCH(awk,TOKEN_WHILE))
{
xp_awk_clrpt (body);
PANIC (awk, XP_AWK_EWHILE);
}
if (__get_token(awk) == -1)
{
xp_awk_clrpt (body);
return XP_NULL;
}
if (!MATCH(awk,TOKEN_LPAREN))
{
xp_awk_clrpt (body);
PANIC (awk, XP_AWK_ELPAREN);
}
if (__get_token(awk) == -1)
{
xp_awk_clrpt (body);
return XP_NULL;
}
test = __parse_expression (awk);
if (test == XP_NULL)
{
xp_awk_clrpt (body);
return XP_NULL;
}
if (!MATCH(awk,TOKEN_RPAREN))
{
xp_awk_clrpt (body);
xp_awk_clrpt (test);
PANIC (awk, XP_AWK_ERPAREN);
}
if (__get_token(awk) == -1)
{
xp_awk_clrpt (body);
xp_awk_clrpt (test);
return XP_NULL;
}
nde = (xp_awk_nde_while_t*) xp_malloc (xp_sizeof(xp_awk_nde_while_t));
if (nde == XP_NULL)
{
xp_awk_clrpt (body);
xp_awk_clrpt (test);
PANIC (awk, XP_AWK_ENOMEM);
}
nde->type = XP_AWK_NDE_DOWHILE;
nde->next = XP_NULL;
nde->test = test;
nde->body = body;
return (xp_awk_nde_t*)nde;
}
static xp_awk_nde_t* __parse_break (xp_awk_t* awk)
{
xp_awk_nde_break_t* nde;
nde = (xp_awk_nde_break_t*) xp_malloc (xp_sizeof(xp_awk_nde_break_t));
if (nde == XP_NULL) PANIC (awk, XP_AWK_ENOMEM);
nde->type = XP_AWK_NDE_BREAK;
nde->next = XP_NULL;
return (xp_awk_nde_t*)nde;
}
static xp_awk_nde_t* __parse_continue (xp_awk_t* awk)
{
xp_awk_nde_continue_t* nde;
nde = (xp_awk_nde_continue_t*)xp_malloc(xp_sizeof(xp_awk_nde_continue_t));
if (nde == XP_NULL) PANIC (awk, XP_AWK_ENOMEM);
nde->type = XP_AWK_NDE_CONTINUE;
nde->next = XP_NULL;
return (xp_awk_nde_t*)nde;
}
static xp_awk_nde_t* __parse_return (xp_awk_t* awk)
{
xp_awk_nde_return_t* nde;
xp_awk_nde_t* val;
nde = (xp_awk_nde_return_t*)xp_malloc(xp_sizeof(xp_awk_nde_return_t));
if (nde == XP_NULL) PANIC (awk, XP_AWK_ENOMEM);
nde->type = XP_AWK_NDE_RETURN;
nde->next = XP_NULL;
if (MATCH(awk,TOKEN_SEMICOLON))
{
/* no return value */
val = XP_NULL;
}
else
{
val = __parse_expression (awk);
if (val == XP_NULL)
{
xp_free (nde);
return XP_NULL;
}
}
nde->val = val;
return (xp_awk_nde_t*)nde;
}
static xp_awk_nde_t* __parse_exit (xp_awk_t* awk)
{
xp_awk_nde_exit_t* nde;
xp_awk_nde_t* val;
nde = (xp_awk_nde_exit_t*)xp_malloc(xp_sizeof(xp_awk_nde_exit_t));
if (nde == XP_NULL) PANIC (awk, XP_AWK_ENOMEM);
nde->type = XP_AWK_NDE_EXIT;
nde->next = XP_NULL;
if (MATCH(awk,TOKEN_SEMICOLON))
{
/* no exit code */
val = XP_NULL;
}
else
{
val = __parse_expression (awk);
if (val == XP_NULL)
{
xp_free (nde);
return XP_NULL;
}
}
nde->val = val;
return (xp_awk_nde_t*)nde;
}
static xp_awk_nde_t* __parse_delete (xp_awk_t* awk)
{
/* TODO: implement this... */
return XP_NULL;
}
static xp_awk_nde_t* __parse_print (xp_awk_t* awk)
{
xp_awk_nde_print_t* nde;
xp_awk_nde_t* args = XP_NULL;
xp_awk_nde_t* out = XP_NULL;
int out_type = -1;
/* TODO: expression list............ */
if (!MATCH(awk,TOKEN_SEMICOLON) &&
!MATCH(awk,TOKEN_GT) &&
!MATCH(awk,TOKEN_BOR) &&
!MATCH(awk,TOKEN_BORAND))
{
args = __parse_expression (awk);
if (args == XP_NULL) return XP_NULL;
}
if (MATCH(awk,TOKEN_GT))
{
out_type = XP_AWK_PRINT_FILE;
}
else if (MATCH(awk,TOKEN_BOR))
{
out_type = XP_AWK_PRINT_PIPE;
}
else if (MATCH(awk,TOKEN_BORAND))
{
out_type = XP_AWK_PRINT_COPROC;
}
if (out_type != -1)
{
if (__get_token(awk) == -1)
{
if (args != XP_NULL) xp_awk_clrpt (args);
return XP_NULL;
}
out = __parse_expression(awk);
if (out == XP_NULL)
{
if (args != XP_NULL) xp_awk_clrpt (args);
return XP_NULL;
}
}
nde = (xp_awk_nde_print_t*)xp_malloc(xp_sizeof(xp_awk_nde_print_t));
if (nde == XP_NULL)
{
if (args != XP_NULL) xp_awk_clrpt (args);
if (out != XP_NULL) xp_awk_clrpt (out);
PANIC (awk, XP_AWK_ENOMEM);
}
nde->type = XP_AWK_NDE_PRINT;
nde->next = XP_NULL;
nde->args = args;
nde->out_type = out_type;
nde->out = out;
return (xp_awk_nde_t*)nde;
}
static xp_awk_nde_t* __parse_printf (xp_awk_t* awk)
{
/* TODO: implement this... */
return XP_NULL;
}
static xp_awk_nde_t* __parse_next (xp_awk_t* awk)
{
xp_awk_nde_next_t* nde;
nde = (xp_awk_nde_next_t*) xp_malloc (xp_sizeof(xp_awk_nde_next_t));
if (nde == XP_NULL) PANIC (awk, XP_AWK_ENOMEM);
nde->type = XP_AWK_NDE_NEXT;
nde->next = XP_NULL;
return (xp_awk_nde_t*)nde;
}
static xp_awk_nde_t* __parse_nextfile (xp_awk_t* awk)
{
xp_awk_nde_nextfile_t* nde;
nde = (xp_awk_nde_nextfile_t*)
xp_malloc (xp_sizeof(xp_awk_nde_nextfile_t));
if (nde == XP_NULL) PANIC (awk, XP_AWK_ENOMEM);
nde->type = XP_AWK_NDE_NEXTFILE;
nde->next = XP_NULL;
return (xp_awk_nde_t*)nde;
}
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);
awk->token.line = awk->lex.line;
awk->token.column = awk->lex.column;
c = awk->lex.curc;
if (c == XP_CHAR_EOF)
{
SET_TOKEN_TYPE (awk, TOKEN_EOF);
}
else if (xp_isdigit(c))
{
if (__get_number(awk) == -1) return -1;
}
else if (xp_isalpha(c) || c == XP_T('_'))
{
int type;
/* identifier */
do
{
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
while (xp_isalpha(c) || c == XP_T('_') || xp_isdigit(c));
type = __classify_ident (awk,XP_STR_BUF(&awk->token.name));
SET_TOKEN_TYPE (awk, type);
}
else if (c == XP_T('\"'))
{
SET_TOKEN_TYPE (awk, TOKEN_STR);
if (__get_string(awk) == -1) return -1;
while (1)
{
do
{
if (__skip_spaces(awk) == -1) return -1;
if ((n = __skip_comment(awk)) == -1) return -1;
}
while (n == 1);
c = awk->lex.curc;
if (c != XP_T('\"')) break;
if (__get_string(awk) == -1) return -1;
}
}
else if (c == XP_T('='))
{
GET_CHAR_TO (awk, c);
if (c == XP_T('='))
{
SET_TOKEN_TYPE (awk, TOKEN_EQ);
ADD_TOKEN_STR (awk, XP_T("=="));
GET_CHAR_TO (awk, c);
}
else
{
SET_TOKEN_TYPE (awk, TOKEN_ASSIGN);
ADD_TOKEN_STR (awk, XP_T("="));
}
}
else if (c == XP_T('!'))
{
GET_CHAR_TO (awk, c);
if (c == XP_T('='))
{
SET_TOKEN_TYPE (awk, TOKEN_NE);
ADD_TOKEN_STR (awk, XP_T("!="));
GET_CHAR_TO (awk, c);
}
else if (c == XP_T('~'))
{
SET_TOKEN_TYPE (awk, TOKEN_NM);
ADD_TOKEN_STR (awk, XP_T("!~"));
GET_CHAR_TO (awk, c);
}
else
{
SET_TOKEN_TYPE (awk, TOKEN_NOT);
ADD_TOKEN_STR (awk, XP_T("!"));
}
}
else if (c == XP_T('>'))
{
GET_CHAR_TO (awk, c);
if ((awk->opt.parse & XP_AWK_SHIFT) && c == XP_T('>'))
{
SET_TOKEN_TYPE (awk, TOKEN_RSHIFT);
ADD_TOKEN_STR (awk, XP_T(">>"));
GET_CHAR_TO (awk, c);
}
else if (c == XP_T('='))
{
SET_TOKEN_TYPE (awk, TOKEN_GE);
ADD_TOKEN_STR (awk, XP_T(">="));
GET_CHAR_TO (awk, c);
}
else
{
SET_TOKEN_TYPE (awk, TOKEN_GT);
ADD_TOKEN_STR (awk, XP_T(">"));
}
}
else if (c == XP_T('<'))
{
GET_CHAR_TO (awk, c);
if ((awk->opt.parse & XP_AWK_SHIFT) && c == XP_T('<'))
{
SET_TOKEN_TYPE (awk, TOKEN_LSHIFT);
ADD_TOKEN_STR (awk, XP_T("<<"));
GET_CHAR_TO (awk, c);
}
else if (c == XP_T('='))
{
SET_TOKEN_TYPE (awk, TOKEN_LE);
ADD_TOKEN_STR (awk, XP_T("<="));
GET_CHAR_TO (awk, c);
}
else
{
SET_TOKEN_TYPE (awk, TOKEN_LT);
ADD_TOKEN_STR (awk, XP_T("<"));
}
}
else if (c == XP_T('|'))
{
GET_CHAR_TO (awk, c);
if (c == XP_T('|'))
{
SET_TOKEN_TYPE (awk, TOKEN_LOR);
ADD_TOKEN_STR (awk, XP_T("||"));
GET_CHAR_TO (awk, c);
}
else if (c == XP_T('&'))
{
SET_TOKEN_TYPE (awk, TOKEN_BORAND);
ADD_TOKEN_STR (awk, XP_T("|&"));
GET_CHAR_TO (awk, c);
}
else
{
SET_TOKEN_TYPE (awk, TOKEN_BOR);
ADD_TOKEN_STR (awk, XP_T("|"));
}
}
else if (c == XP_T('&'))
{
GET_CHAR_TO (awk, c);
if (c == XP_T('&'))
{
SET_TOKEN_TYPE (awk, TOKEN_LAND);
ADD_TOKEN_STR (awk, XP_T("&&"));
GET_CHAR_TO (awk, c);
}
else
{
SET_TOKEN_TYPE (awk, TOKEN_BAND);
ADD_TOKEN_STR (awk, XP_T("&"));
}
}
else if (c == XP_T('~'))
{
SET_TOKEN_TYPE (awk, TOKEN_TILDE);
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
else if (c == XP_T('^'))
{
SET_TOKEN_TYPE (awk, TOKEN_BXOR);
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
else if (c == XP_T('+'))
{
GET_CHAR_TO (awk, c);
if (c == XP_T('+'))
{
SET_TOKEN_TYPE (awk, TOKEN_PLUSPLUS);
ADD_TOKEN_STR (awk, XP_T("++"));
GET_CHAR_TO (awk, c);
}
else if (c == XP_T('='))
{
SET_TOKEN_TYPE (awk, TOKEN_PLUS_ASSIGN);
ADD_TOKEN_STR (awk, XP_T("+="));
GET_CHAR_TO (awk, c);
}
else
{
SET_TOKEN_TYPE (awk, TOKEN_PLUS);
ADD_TOKEN_STR (awk, XP_T("+"));
}
}
else if (c == XP_T('-'))
{
GET_CHAR_TO (awk, c);
if (c == XP_T('-'))
{
SET_TOKEN_TYPE (awk, TOKEN_MINUSMINUS);
ADD_TOKEN_STR (awk, XP_T("--"));
GET_CHAR_TO (awk, c);
}
else if (c == XP_T('='))
{
SET_TOKEN_TYPE (awk, TOKEN_MINUS_ASSIGN);
ADD_TOKEN_STR (awk, XP_T("-="));
GET_CHAR_TO (awk, c);
}
else
{
SET_TOKEN_TYPE (awk, TOKEN_MINUS);
ADD_TOKEN_STR (awk, XP_T("-"));
}
}
else if (c == XP_T('*'))
{
GET_CHAR_TO (awk, c);
if (c == XP_T('='))
{
SET_TOKEN_TYPE (awk, TOKEN_MUL_ASSIGN);
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
else if (c == XP_T('*'))
{
GET_CHAR_TO (awk, c);
if (c == XP_T('='))
{
SET_TOKEN_TYPE (awk, TOKEN_EXP_ASSIGN);
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
else
{
SET_TOKEN_TYPE (awk, TOKEN_EXP);
ADD_TOKEN_CHAR (awk, c);
}
}
else
{
SET_TOKEN_TYPE (awk, TOKEN_MUL);
ADD_TOKEN_CHAR (awk, c);
}
}
else if (c == XP_T('/'))
{
GET_CHAR_TO (awk, c);
if (c == XP_T('='))
{
SET_TOKEN_TYPE (awk, TOKEN_DIV_ASSIGN);
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
else
{
SET_TOKEN_TYPE (awk, TOKEN_DIV);
ADD_TOKEN_CHAR (awk, c);
}
}
else if (c == XP_T('%'))
{
GET_CHAR_TO (awk, c);
if (c == XP_T('='))
{
SET_TOKEN_TYPE (awk, TOKEN_MOD_ASSIGN);
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
else
{
SET_TOKEN_TYPE (awk, TOKEN_MOD);
ADD_TOKEN_CHAR (awk, c);
}
}
else if (c == XP_T('('))
{
SET_TOKEN_TYPE (awk, TOKEN_LPAREN);
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
else if (c == XP_T(')'))
{
SET_TOKEN_TYPE (awk, TOKEN_RPAREN);
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
else if (c == XP_T('{'))
{
SET_TOKEN_TYPE (awk, TOKEN_LBRACE);
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
else if (c == XP_T('}'))
{
SET_TOKEN_TYPE (awk, TOKEN_RBRACE);
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
else if (c == XP_T('['))
{
SET_TOKEN_TYPE (awk, TOKEN_LBRACK);
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
else if (c == XP_T(']'))
{
SET_TOKEN_TYPE (awk, TOKEN_RBRACK);
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
else if (c == XP_T('$'))
{
SET_TOKEN_TYPE (awk, TOKEN_DOLLAR);
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
else if (c == XP_T(','))
{
SET_TOKEN_TYPE (awk, TOKEN_COMMA);
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
else if (c == XP_T('.'))
{
SET_TOKEN_TYPE (awk, TOKEN_PERIOD);
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
else if (c == XP_T(';'))
{
SET_TOKEN_TYPE (awk, TOKEN_SEMICOLON);
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
else if (c == XP_T(':'))
{
SET_TOKEN_TYPE (awk, TOKEN_COLON);
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
else if (c == XP_T('?'))
{
SET_TOKEN_TYPE (awk, TOKEN_QUEST);
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
else
{
awk->errnum = XP_AWK_ELXCHR;
return -1;
}
/*xp_printf (XP_T("token -> [%s]\n"), XP_STR_BUF(&awk->token.name));*/
return 0;
}
static int __get_number (xp_awk_t* awk)
{
xp_cint_t c;
xp_assert (XP_STR_LEN(&awk->token.name) == 0);
SET_TOKEN_TYPE (awk, TOKEN_INT);
c = awk->lex.curc;
if (c == XP_T('0'))
{
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
if (c == XP_T('x') || c == XP_T('X'))
{
/* hexadecimal number */
do
{
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
while (xp_isxdigit(c));
return 0;
}
else if (c == XP_T('b') || c == XP_T('B'))
{
/* binary number */
do
{
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
while (c == XP_T('0') || c == XP_T('1'));
return 0;
}
else if (c != '.')
{
/* octal number */
while (c >= XP_T('0') && c <= XP_T('7'))
{
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
return 0;
}
}
while (xp_isdigit(c))
{
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
if (c == XP_T('.'))
{
/* floating-point number */
SET_TOKEN_TYPE (awk, TOKEN_REAL);
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
while (xp_isdigit(c))
{
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
}
if (c == XP_T('E') || c == XP_T('e'))
{
SET_TOKEN_TYPE (awk, TOKEN_REAL);
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
if (c == XP_T('+') || c == XP_T('-'))
{
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
while (xp_isdigit(c))
{
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
}
return 0;
}
static int __get_string (xp_awk_t* awk)
{
xp_cint_t c;
xp_bool_t escaped = xp_false;
GET_CHAR_TO (awk, c);
while (1)
{
if (c == XP_CHAR_EOF)
{
awk->errnum = XP_AWK_EENDSTR;
return -1;
}
if (escaped == xp_false && c == XP_T('\"'))
{
GET_CHAR_TO (awk, c);
break;
}
if (escaped == xp_false && c == XP_T('\\'))
{
GET_CHAR_TO (awk, c);
escaped = xp_true;
continue;
}
if (escaped == xp_true)
{
if (c == XP_T('n')) c = XP_T('\n');
else if (c == XP_T('r')) c = XP_T('\r');
else if (c == XP_T('t')) c = XP_T('\t');
/* TODO: more escape characters */
escaped = xp_false;
}
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
return 0;
}
static int __get_regex (xp_awk_t* awk)
{
/* TODO: do proper regular expression parsing */
/* TODO: think if the new line should be allowed to
* be included in to a regular expression */
xp_cint_t c;
xp_bool_t escaped = xp_false;
GET_CHAR_TO (awk, c);
while (1)
{
if (c == XP_CHAR_EOF)
{
awk->errnum = XP_AWK_EENDREX;
return -1;
}
if (escaped == xp_false && c == XP_T('/'))
{
GET_CHAR_TO (awk, c);
break;
}
if (escaped == xp_false && c == XP_T('\\'))
{
GET_CHAR_TO (awk, c);
escaped = xp_true;
continue;
}
if (escaped == xp_true)
{
if (c == XP_T('n')) c = XP_T('\n');
else if (c == XP_T('r')) c = XP_T('\r');
else if (c == XP_T('t')) c = XP_T('\t');
/* TODO: more escape characters */
escaped = xp_false;
}
ADD_TOKEN_CHAR (awk, c);
GET_CHAR_TO (awk, c);
}
return 0;
}
static int __get_char (xp_awk_t* awk)
{
xp_ssize_t n;
/*xp_char_t c;*/
if (awk->lex.ungotc_count > 0)
{
awk->lex.curc = awk->lex.ungotc[--awk->lex.ungotc_count];
return 0;
}
/*
n = awk->srcio (XP_AWK_INPUT_DATA, awk->srcio_arg, &c, 1);
if (n == -1)
{
awk->errnum = XP_AWK_ESRCINDATA;
return -1;
}
awk->lex.curc = (n == 0)? XP_CHAR_EOF: c;
*/
if (awk->lex.buf_pos >= awk->lex.buf_len)
{
n = awk->srcio (XP_AWK_INPUT_DATA,
awk->srcio_arg, awk->lex.buf, xp_countof(awk->lex.buf));
if (n == -1)
{
awk->errnum = XP_AWK_ESRCINDATA;
return -1;
}
if (n == 0)
{
awk->lex.curc = XP_CHAR_EOF;
return 0;
}
awk->lex.buf_pos = 0;
awk->lex.buf_len = n;
}
awk->lex.curc = awk->lex.buf[awk->lex.buf_pos++];
if (awk->lex.curc == XP_CHAR('\n'))
{
awk->lex.line++;
awk->lex.column = 1;
}
else awk->lex.column++;
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 ((awk->opt.parse & XP_AWK_HASHSIGN) && c == XP_T('#'))
{
do
{
GET_CHAR_TO (awk, c);
}
while (c != '\n' && c != XP_CHAR_EOF);
GET_CHAR (awk);
return 1; /* comment by # */
}
if (c != XP_T('/')) return 0; /* not a comment */
GET_CHAR_TO (awk, c);
if ((awk->opt.parse & XP_AWK_DBLSLASHES) && c == XP_T('/'))
{
do
{
GET_CHAR_TO (awk, c);
}
while (c != '\n' && c != XP_CHAR_EOF);
GET_CHAR (awk);
return 1; /* comment by // */
}
else if (c == XP_T('*'))
{
do
{
GET_CHAR_TO (awk, c);
if (c == XP_T('*'))
{
GET_CHAR_TO (awk, c);
if (c == XP_T('/'))
{
GET_CHAR_TO (awk, c);
break;
}
}
}
while (1);
return 1; /* c-style comment */
}
if (__unget_char(awk,c) == -1) return -1; /* error */
awk->lex.curc = XP_T('/');
return 0;
}
static int __classify_ident (xp_awk_t* awk, const xp_char_t* ident)
{
struct __kwent* kwp;
for (kwp = __kwtab; kwp->name != XP_NULL; kwp++)
{
if (kwp->valid != 0 &&
(awk->opt.parse & kwp->valid) == 0) continue;
if (xp_strcmp(kwp->name, ident) == 0) return kwp->type;
}
return TOKEN_IDENT;
}
static int __assign_to_opcode (xp_awk_t* awk)
{
if (MATCH(awk,TOKEN_ASSIGN)) return XP_AWK_ASSOP_NONE;
if (MATCH(awk,TOKEN_PLUS_ASSIGN)) return XP_AWK_ASSOP_PLUS;
if (MATCH(awk,TOKEN_MINUS_ASSIGN)) return XP_AWK_ASSOP_MINUS;
if (MATCH(awk,TOKEN_MUL_ASSIGN)) return XP_AWK_ASSOP_MUL;
if (MATCH(awk,TOKEN_DIV_ASSIGN)) return XP_AWK_ASSOP_DIV;
if (MATCH(awk,TOKEN_MOD_ASSIGN)) return XP_AWK_ASSOP_MOD;
if (MATCH(awk,TOKEN_EXP_ASSIGN)) return XP_AWK_ASSOP_EXP;
return -1;
}
static int __is_plain_var (xp_awk_nde_t* nde)
{
return nde->type == XP_AWK_NDE_GLOBAL ||
nde->type == XP_AWK_NDE_LOCAL ||
nde->type == XP_AWK_NDE_ARG ||
nde->type == XP_AWK_NDE_NAMED;
}
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