1996-07-09 08:22:35 +02:00
|
|
|
/*-------------------------------------------------------------------------
|
|
|
|
*
|
|
|
|
* read.c--
|
|
|
|
* routines to convert a string (legal ascii representation of node) back
|
|
|
|
* to nodes
|
|
|
|
*
|
|
|
|
* Copyright (c) 1994, Regents of the University of California
|
|
|
|
*
|
|
|
|
*
|
|
|
|
* IDENTIFICATION
|
1996-11-08 07:02:30 +01:00
|
|
|
* $Header: /cvsroot/pgsql/src/backend/nodes/read.c,v 1.2 1996/11/08 05:56:48 momjian Exp $
|
1996-07-09 08:22:35 +02:00
|
|
|
*
|
|
|
|
* HISTORY
|
|
|
|
* AUTHOR DATE MAJOR EVENT
|
|
|
|
* Andrew Yu Nov 2, 1994 file creation
|
|
|
|
*
|
|
|
|
*-------------------------------------------------------------------------
|
|
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
|
|
#include <string.h>
|
|
|
|
#include <ctype.h>
|
|
|
|
#include "postgres.h"
|
|
|
|
#include "nodes/pg_list.h"
|
|
|
|
#include "nodes/readfuncs.h"
|
|
|
|
#include "utils/elog.h"
|
|
|
|
|
|
|
|
/*
|
|
|
|
* stringToNode -
|
|
|
|
* returns a Node with a given legal ascii representation
|
|
|
|
*/
|
|
|
|
void *
|
|
|
|
stringToNode(char *str)
|
|
|
|
{
|
|
|
|
void *retval;
|
|
|
|
|
|
|
|
(void) lsptok(str, NULL); /* set the string used in lsptok */
|
|
|
|
retval = nodeRead(true); /* start reading */
|
|
|
|
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*****************************************************************************
|
|
|
|
*
|
|
|
|
* the lisp token parser
|
|
|
|
*
|
|
|
|
*****************************************************************************/
|
|
|
|
|
|
|
|
#define RIGHT_PAREN (1000000 + 1)
|
|
|
|
#define LEFT_PAREN (1000000 + 2)
|
|
|
|
#define PLAN_SYM (1000000 + 3)
|
|
|
|
#define AT_SYMBOL (1000000 + 4)
|
|
|
|
#define ATOM_TOKEN (1000000 + 5)
|
|
|
|
|
|
|
|
/*
|
|
|
|
* nodeTokenType -
|
|
|
|
* returns the type of the node token contained in token.
|
|
|
|
* It returns one of the following valid NodeTags:
|
|
|
|
* T_Integer, T_Float, T_String
|
|
|
|
* and some of its own:
|
|
|
|
* RIGHT_PAREN, LEFT_PAREN, PLAN_SYM, AT_SYMBOL, ATOM_TOKEN
|
|
|
|
*
|
|
|
|
* Assumption: the ascii representation is legal
|
|
|
|
*/
|
|
|
|
static NodeTag
|
|
|
|
nodeTokenType(char *token, int length)
|
|
|
|
{
|
1996-11-08 07:02:30 +01:00
|
|
|
NodeTag retval = 0;
|
1996-07-09 08:22:35 +02:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Check if the token is a number (decimal or integer,
|
|
|
|
* positive or negative
|
|
|
|
*/
|
|
|
|
if (isdigit(*token) ||
|
|
|
|
(length>=2 && *token=='-' && isdigit(*(token+1)) ))
|
|
|
|
{
|
|
|
|
/*
|
|
|
|
* skip the optional '-' (i.e. negative number)
|
|
|
|
*/
|
|
|
|
if (*token == '-') {
|
|
|
|
token++;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* See if there is a decimal point
|
|
|
|
*/
|
|
|
|
|
|
|
|
for (; length && *token != '.'; token++, length--);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* if there isn't, token's an int, otherwise it's a float.
|
|
|
|
*/
|
|
|
|
|
|
|
|
retval = (*token != '.') ? T_Integer : T_Float;
|
|
|
|
}
|
|
|
|
else if (isalpha(*token))
|
|
|
|
retval = ATOM_TOKEN;
|
|
|
|
else if (*token == '(')
|
|
|
|
retval = LEFT_PAREN;
|
|
|
|
else if (*token == ')')
|
|
|
|
retval = RIGHT_PAREN;
|
|
|
|
else if (*token == '@')
|
|
|
|
retval = AT_SYMBOL;
|
|
|
|
else if (*token == '\"')
|
|
|
|
retval = T_String;
|
|
|
|
else if (*token == '{')
|
|
|
|
retval = PLAN_SYM;
|
|
|
|
return(retval);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Works kinda like strtok, except it doesn't put nulls into string.
|
|
|
|
*
|
|
|
|
* Returns the length in length instead. The string can be set without
|
|
|
|
* returning a token by calling lsptok with length == NULL.
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
char *
|
|
|
|
lsptok(char *string, int *length)
|
|
|
|
{
|
|
|
|
static char *local_str;
|
|
|
|
char *ret_string;
|
|
|
|
|
|
|
|
if (string != NULL) {
|
|
|
|
local_str = string;
|
|
|
|
if (length == NULL) {
|
|
|
|
return(NULL);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
for (; *local_str == ' '
|
|
|
|
|| *local_str == '\n'
|
|
|
|
|| *local_str == '\t'; local_str++);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Now pointing at next token.
|
|
|
|
*/
|
|
|
|
ret_string = local_str;
|
|
|
|
if (*local_str == '\0') return(NULL);
|
|
|
|
*length = 1;
|
|
|
|
|
|
|
|
if (*local_str == '\"') {
|
|
|
|
for (local_str++; *local_str != '\"'; (*length)++, local_str++);
|
|
|
|
(*length)++; local_str++;
|
|
|
|
}else if (*local_str == ')' || *local_str == '(' ||
|
|
|
|
*local_str == '}' || *local_str == '{') {
|
|
|
|
local_str++;
|
|
|
|
}else {
|
|
|
|
for (; *local_str != ' '
|
|
|
|
&& *local_str != '\n'
|
|
|
|
&& *local_str != '\t'
|
|
|
|
&& *local_str != '{'
|
|
|
|
&& *local_str != '}'
|
|
|
|
&& *local_str != '('
|
|
|
|
&& *local_str != ')'; local_str++, (*length)++);
|
|
|
|
(*length)--;
|
|
|
|
}
|
|
|
|
return(ret_string);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This guy does all the reading.
|
|
|
|
*
|
|
|
|
* Secrets: He assumes that lsptok already has the string (see below).
|
|
|
|
* Any callers should set read_car_only to true.
|
|
|
|
*/
|
|
|
|
void *
|
|
|
|
nodeRead(bool read_car_only)
|
|
|
|
{
|
|
|
|
char *token;
|
|
|
|
NodeTag type;
|
1996-11-08 07:02:30 +01:00
|
|
|
Node *this_value = NULL, *return_value = NULL;
|
1996-07-09 08:22:35 +02:00
|
|
|
int tok_len;
|
|
|
|
char tmp;
|
|
|
|
bool make_dotted_pair_cell = false;
|
|
|
|
|
|
|
|
token = lsptok(NULL, &tok_len);
|
|
|
|
|
|
|
|
if (token == NULL) return(NULL);
|
|
|
|
|
|
|
|
type = nodeTokenType(token, tok_len);
|
|
|
|
|
|
|
|
switch(type) {
|
|
|
|
case PLAN_SYM:
|
|
|
|
this_value = parsePlanString();
|
|
|
|
token = lsptok(NULL, &tok_len);
|
|
|
|
if (token[0] != '}') return(NULL);
|
|
|
|
|
|
|
|
if (!read_car_only)
|
|
|
|
make_dotted_pair_cell = true;
|
|
|
|
else
|
|
|
|
make_dotted_pair_cell = false;
|
|
|
|
break;
|
|
|
|
case LEFT_PAREN:
|
|
|
|
if (!read_car_only) {
|
|
|
|
List *l = makeNode(List);
|
|
|
|
|
|
|
|
lfirst(l) = nodeRead(false);
|
|
|
|
lnext(l) = nodeRead(false);
|
|
|
|
this_value = (Node*)l;
|
|
|
|
}else {
|
|
|
|
this_value = nodeRead(false);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case RIGHT_PAREN:
|
|
|
|
this_value = NULL;
|
|
|
|
break;
|
|
|
|
case AT_SYMBOL:
|
|
|
|
break;
|
|
|
|
case ATOM_TOKEN:
|
|
|
|
if (!strncmp(token, "nil", 3)) {
|
|
|
|
this_value = NULL;
|
|
|
|
/*
|
|
|
|
* It might be "nil" but it is an atom!
|
|
|
|
*/
|
|
|
|
if (read_car_only) {
|
|
|
|
make_dotted_pair_cell = false;
|
|
|
|
} else {
|
|
|
|
make_dotted_pair_cell = true;
|
|
|
|
}
|
|
|
|
}else {
|
|
|
|
tmp = token[tok_len];
|
|
|
|
token[tok_len] = '\0';
|
|
|
|
this_value = (Node*)pstrdup(token); /* !attention! not a Node.
|
|
|
|
use with caution */
|
|
|
|
token[tok_len] = tmp;
|
|
|
|
make_dotted_pair_cell = true;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case T_Float:
|
|
|
|
tmp = token[tok_len];
|
|
|
|
token[tok_len] = '\0';
|
|
|
|
this_value = (Node*)makeFloat(atof(token));
|
|
|
|
token[tok_len] = tmp;
|
|
|
|
make_dotted_pair_cell = true;
|
|
|
|
break;
|
|
|
|
case T_Integer:
|
|
|
|
tmp = token[tok_len];
|
|
|
|
token[tok_len] = '\0';
|
|
|
|
this_value = (Node*)makeInteger(atoi(token));
|
|
|
|
token[tok_len] = tmp;
|
|
|
|
make_dotted_pair_cell = true;
|
|
|
|
break;
|
|
|
|
case T_String:
|
|
|
|
tmp = token[tok_len - 1];
|
|
|
|
token[tok_len - 1] = '\0';
|
|
|
|
token++;
|
|
|
|
this_value = (Node*)makeString(token); /* !! not strdup'd */
|
|
|
|
token[tok_len - 2] = tmp;
|
|
|
|
make_dotted_pair_cell = true;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
elog(WARN, "nodeRead: Bad type %d", type);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (make_dotted_pair_cell) {
|
|
|
|
List *l = makeNode(List);
|
|
|
|
|
|
|
|
lfirst(l) = this_value;
|
|
|
|
if (!read_car_only) {
|
|
|
|
lnext(l) = nodeRead(false);
|
|
|
|
}else {
|
|
|
|
lnext(l) = NULL;
|
|
|
|
}
|
|
|
|
return_value = (Node*)l;
|
|
|
|
}else {
|
|
|
|
return_value = this_value;
|
|
|
|
}
|
|
|
|
return(return_value);
|
|
|
|
}
|
|
|
|
|