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hyung-hwan
2006-01-11 11:52:17 +00:00
parent 9f8e0c20bc
commit d625b17f00
1 changed files with 70 additions and 15 deletions
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85
ase/awk/parse.c
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@ -1,5 +1,5 @@
/* /*
* $Id: parse.c,v 1.12 2006-01-10 13:57:54 bacon Exp $ * $Id: parse.c,v 1.13 2006-01-11 11:52:17 bacon Exp $
*/ */
#include <xp/awk/awk.h> #include <xp/awk/awk.h>
@ -8,6 +8,7 @@
#include <xp/bas/memory.h> #include <xp/bas/memory.h>
#include <xp/bas/ctype.h> #include <xp/bas/ctype.h>
#include <xp/bas/string.h> #include <xp/bas/string.h>
#include <xp/bas/assert.h>
enum enum
{ {
@ -62,10 +63,12 @@ static xp_awk_node_t* __parse_patnact (xp_awk_t* awk);
static xp_awk_node_t* __parse_block (xp_awk_t* awk); static xp_awk_node_t* __parse_block (xp_awk_t* awk);
static xp_awk_node_t* __parse_stat (xp_awk_t* awk); static xp_awk_node_t* __parse_stat (xp_awk_t* awk);
static xp_awk_node_t* __parse_expr (xp_awk_t* awk); static xp_awk_node_t* __parse_expr (xp_awk_t* awk);
static xp_awk_node_t* __parse_additive (xp_awk_t* awk) static xp_awk_node_t* __parse_assignment (xp_awk_t* awk, const xp_char_t* ident);
static xp_awk_node_t* __parse_multiplicative (xp_awk_t* awk) static xp_awk_node_t* __parse_basic_expr (xp_awk_t* awk, const xp_char_t* ident);
static xp_awk_node_t* __parse_unary (xp_awk_t* awk) static xp_awk_node_t* __parse_additive (xp_awk_t* awk);
static xp_awk_node_t* __parse_primary (xp_awk_t* awk) static xp_awk_node_t* __parse_multiplicative (xp_awk_t* awk);
static xp_awk_node_t* __parse_unary (xp_awk_t* awk);
static xp_awk_node_t* __parse_primary (xp_awk_t* awk);
static xp_awk_node_t* __parse_if (xp_awk_t* awk); static xp_awk_node_t* __parse_if (xp_awk_t* awk);
static xp_awk_node_t* __parse_while (xp_awk_t* awk); static xp_awk_node_t* __parse_while (xp_awk_t* awk);
static xp_awk_node_t* __parse_for (xp_awk_t* awk); static xp_awk_node_t* __parse_for (xp_awk_t* awk);
@ -312,13 +315,6 @@ xp_printf (XP_TEXT("__parse_block....\n"));
else prev->next = node; else prev->next = node;
prev = node; prev = node;
if (saved_token != TOKEN_LBRACE) {
if (!MATCH(awk,TOKEN_SEMICOLON)) {
/* TODO: do some clean-up */
PANIC (awk, XP_AWK_ESEMICOLON);
}
CONSUME (awk);
}
} }
return (xp_awk_node_t*)blk; return (xp_awk_node_t*)blk;
@ -381,17 +377,74 @@ static xp_awk_node_t* __parse_stat (xp_awk_t* awk)
node = __parse_expr(awk); node = __parse_expr(awk);
} }
/* check if a statement ends with a semicolon */
if (!MATCH(awk,TOKEN_SEMICOLON)) {
/* TODO: do some clean-up */
PANIC (awk, XP_AWK_ESEMICOLON);
}
/* eat up the semicolon and read in the next token */
CONSUME (awk);
return node; return node;
} }
static xp_awk_node_t* __parse_expr (xp_awk_t* awk) static xp_awk_node_t* __parse_expr (xp_awk_t* awk)
{ {
return parse_additive (xp_awk_t* awk); /*
* <expression> ::= <assignment> | <basic expression>
* <assignment> ::= <assignment target> assignmentOperator <basic expression>
* assignmentOperator ::= '='
* <basic expression> ::=
*/
if (MATCH(awk,TOKEN_IDENT)) {
// TODO: use a different approach later...
xp_char_t* ident = xp_strdup (XP_STR_BUF(&awk->token.name));
if (ident == XP_NULL) {
// TODO: memory clean up
PANIC (awk, XP_AWK_ENOMEM);
}
CONSUME (awk);
if (MATCH(awk,TOKEN_ASSIGN)) {
CONSUME (awk);
if (__parse_assignment(awk, ident) == XP_NULL) {
// TODO: memory clean up
return XP_NULL;
}
}
else {
return __parse_basic_expr (awk, ident);
}
}
return __parse_basic_expr (awk, XP_NULL);
}
static xp_awk_node_t* __parse_assignment (xp_awk_t* awk, const xp_char_t* ident)
{
xp_assert (ident != XP_NULL);
return XP_NULL;
}
static xp_awk_node_t* __parse_basic_expr (xp_awk_t* awk, const xp_char_t* ident)
{
/* <basic expression> ::= <additive>
* <additive> ::= <multiplicative> [additiveOp <multiplicative>]*
* <multiplicative> ::= <unary> [multiplicativeOp <unary>]*
* <unary> ::= [unaryOp]* <term>
* <term> ::= <function call> | variable | literals
* <function call> ::= <identifier> <lparen> <basic expression list>* <rparen>
* <basic expression list> ::= <basic expression> [comma <basic expression>]*
*/
return __parse_additive (awk);
} }
static xp_awk_node_t* __parse_additive (xp_awk_t* awk) static xp_awk_node_t* __parse_additive (xp_awk_t* awk)
{ {
xp_node_t* top, * left, * right; xp_awk_node_t* top, * left, * right;
left = __parse_multiplicative (awk); left = __parse_multiplicative (awk);
if (left == XP_NULL) return XP_NULL; if (left == XP_NULL) return XP_NULL;
@ -413,7 +466,7 @@ static xp_awk_node_t* __parse_additive (xp_awk_t* awk)
static xp_awk_node_t* __parse_multiplicative (xp_awk_t* awk) static xp_awk_node_t* __parse_multiplicative (xp_awk_t* awk)
{ {
xp_node_t* top, * left, * right; xp_awk_node_t* top, * left, * right;
left = __parse_unary (awk); left = __parse_unary (awk);
if (left == XP_NULL) return XP_NULL; if (left == XP_NULL) return XP_NULL;
@ -440,6 +493,7 @@ static xp_awk_node_t* __parse_unary (xp_awk_t* awk)
static xp_awk_node_t* __parse_primary (xp_awk_t* awk) static xp_awk_node_t* __parse_primary (xp_awk_t* awk)
{ {
#if 0
if (MATCH(awk,TOKEN_IDENT)) { if (MATCH(awk,TOKEN_IDENT)) {
xp_awk_node_term_t* node; xp_awk_node_term_t* node;
node = (xp_awk_node_term_t*)xp_malloc(xp_sizeof(xp_awk_node_term_t)); node = (xp_awk_node_term_t*)xp_malloc(xp_sizeof(xp_awk_node_term_t));
@ -478,6 +532,7 @@ static xp_awk_node_t* __parse_primary (xp_awk_t* awk)
node->value = tmp; node->value = tmp;
} }
#endif
/* valid expression introducer is expected */ /* valid expression introducer is expected */
PANIC (awk, XP_AWK_EEXPR); PANIC (awk, XP_AWK_EEXPR);
} }