-/* PSPP - computes sample statistics.
- Copyright (C) 1997-9, 2000, 2006 Free Software Foundation, Inc.
+/* PSPP - a program for statistical analysis.
+ Copyright (C) 1997-9, 2000, 2006, 2010, 2011, 2012, 2014 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or
- modify it under the terms of the GNU General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
- This program is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <limits.h>
#include <stdlib.h>
-#include "helpers.h"
-#include <data/case.h>
-#include <data/dictionary.h>
-#include <data/settings.h>
-#include <data/variable.h>
-#include <language/lexer/format-parser.h>
-#include <language/lexer/lexer.h>
-#include <language/lexer/variable-parser.h>
-#include <libpspp/alloc.h>
-#include <libpspp/array.h>
-#include <libpspp/assertion.h>
-#include <libpspp/message.h>
-#include <libpspp/misc.h>
-#include <libpspp/pool.h>
-#include <libpspp/str.h>
+#include "data/case.h"
+#include "data/dictionary.h"
+#include "data/settings.h"
+#include "data/variable.h"
+#include "language/expressions/helpers.h"
+#include "language/lexer/format-parser.h"
+#include "language/lexer/lexer.h"
+#include "language/lexer/variable-parser.h"
+#include "libpspp/array.h"
+#include "libpspp/assertion.h"
+#include "libpspp/i18n.h"
+#include "libpspp/message.h"
+#include "libpspp/misc.h"
+#include "libpspp/pool.h"
+#include "libpspp/str.h"
+
+#include "gl/c-strcase.h"
+#include "gl/minmax.h"
+#include "gl/xalloc.h"
\f
/* Declarations. */
/* Recursive descent parser in order of increasing precedence. */
-typedef union any_node *parse_recursively_func (struct lexer *, struct expression *);
+typedef struct expr_node *parse_recursively_func (struct lexer *, struct expression *);
static parse_recursively_func parse_or, parse_and, parse_not;
static parse_recursively_func parse_rel, parse_add, parse_mul;
static parse_recursively_func parse_neg, parse_exp;
/* Utility functions. */
static struct expression *expr_create (struct dataset *ds);
-atom_type expr_node_returns (const union any_node *);
+atom_type expr_node_returns (const struct expr_node *);
static const char *atom_type_name (atom_type);
-static struct expression *finish_expression (union any_node *,
+static struct expression *finish_expression (struct expr_node *,
struct expression *);
-static bool type_check (struct expression *, union any_node **,
- enum expr_type expected_type);
-static union any_node *allocate_unary_variable (struct expression *,
- struct variable *);
+static bool type_check (const struct expression *, const struct expr_node *,
+ enum val_type expected_type);
+static struct expr_node *allocate_unary_variable (struct expression *,
+ const struct variable *);
\f
/* Public functions. */
-/* Parses an expression of the given TYPE.
- If DICT is nonnull then variables and vectors within it may be
- referenced within the expression; otherwise, the expression
- must not reference any variables or vectors.
- Returns the new expression if successful or a null pointer
- otherwise. */
+static struct expr_node *
+parse_expr (struct lexer *lexer, struct expression *e)
+{
+ struct expr_node *n = parse_or (lexer, e);
+ if (n && n->type == OP_VEC_ELEM_NUM_RAW)
+ n->type = OP_VEC_ELEM_NUM;
+ return n;
+}
+
+/* Parses an expression of the given TYPE. If DS is nonnull then variables and
+ vectors within it may be referenced within the expression; otherwise, the
+ expression must not reference any variables or vectors. Returns the new
+ expression if successful or a null pointer otherwise. */
struct expression *
-expr_parse (struct lexer *lexer, struct dataset *ds, enum expr_type type)
+expr_parse (struct lexer *lexer, struct dataset *ds, enum val_type type)
{
- union any_node *n;
- struct expression *e;
+ assert (val_type_is_valid (type));
- assert (type == EXPR_NUMBER || type == EXPR_STRING || type == EXPR_BOOLEAN);
+ struct expression *e = expr_create (ds);
+ struct expr_node *n = parse_expr (lexer, e);
+ if (!n || !type_check (e, n, type))
+ {
+ expr_free (e);
+ return NULL;
+ }
- e = expr_create (ds);
- n = parse_or (lexer, e);
- if (n != NULL && type_check (e, &n, type))
- return finish_expression (expr_optimize (n, e), e);
- else
+ return finish_expression (expr_optimize (n, e), e);
+}
+
+/* Parses a boolean expression, otherwise similar to expr_parse(). */
+struct expression *
+expr_parse_bool (struct lexer *lexer, struct dataset *ds)
+{
+ struct expression *e = expr_create (ds);
+ struct expr_node *n = parse_expr (lexer, e);
+ if (!n)
+ {
+ expr_free (e);
+ return NULL;
+ }
+
+ atom_type actual_type = expr_node_returns (n);
+ if (actual_type == OP_number)
+ n = expr_allocate_unary (e, OP_EXPR_TO_BOOLEAN, n);
+ else if (actual_type != OP_boolean)
{
+ msg_at (SE, expr_location (e, n),
+ _("Type mismatch: expression has %s type, "
+ "but a boolean value is required here."),
+ atom_type_name (actual_type));
expr_free (e);
- return NULL;
+ return NULL;
}
+
+ return finish_expression (expr_optimize (n, e), e);
}
-/* Parses and returns an expression of the given TYPE, as
- expr_parse(), and sets up so that destroying POOL will free
- the expression as well. */
+/* Parses a numeric expression that is intended to be assigned to newly created
+ variable NEW_VAR_NAME. (This allows for a better error message if the
+ expression is not numeric.) Otherwise similar to expr_parse(). */
struct expression *
-expr_parse_pool (struct lexer *lexer,
- struct pool *pool,
- struct dataset *ds,
- enum expr_type type)
+expr_parse_new_variable (struct lexer *lexer, struct dataset *ds,
+ const char *new_var_name)
{
- struct expression *e = expr_parse (lexer, ds, type);
- if (e != NULL)
- pool_add_subpool (pool, e->expr_pool);
- return e;
+ struct expression *e = expr_create (ds);
+ struct expr_node *n = parse_expr (lexer, e);
+ if (!n)
+ {
+ expr_free (e);
+ return NULL;
+ }
+
+ atom_type actual_type = expr_node_returns (n);
+ if (actual_type != OP_number && actual_type != OP_boolean)
+ {
+ msg (SE, _("This command tries to create a new variable %s by assigning a "
+ "string value to it, but this is not supported. Use "
+ "the STRING command to create the new variable with the "
+ "correct width before assigning to it, e.g. STRING %s(A20)."),
+ new_var_name, new_var_name);
+ expr_free (e);
+ return NULL;
+ }
+
+ return finish_expression (expr_optimize (n, e), e);
}
/* Free expression E. */
struct expression *
expr_parse_any (struct lexer *lexer, struct dataset *ds, bool optimize)
{
- union any_node *n;
+ struct expr_node *n;
struct expression *e;
e = expr_create (ds);
- n = parse_or (lexer, e);
+ n = parse_expr (lexer, e);
if (n == NULL)
{
expr_free (e);
return NULL;
}
-
+
if (optimize)
n = expr_optimize (n, e);
return finish_expression (n, e);
/* Finishing up expression building. */
/* Height of an expression's stacks. */
-struct stack_heights
+struct stack_heights
{
int number_height; /* Height of number stack. */
int string_height; /* Height of string stack. */
atom_type_stack (atom_type type)
{
assert (is_atom (type));
-
- switch (type)
+
+ switch (type)
{
case OP_number:
case OP_boolean:
+ case OP_num_vec_elem:
return &on_number_stack;
case OP_string:
case OP_integer:
case OP_pos_int:
case OP_vector:
+ case OP_expr_node:
return ¬_on_stack;
-
+
default:
NOT_REACHED ();
}
the final stack height. Updates *MAX, if necessary, to
reflect the maximum intermediate or final height. */
static void
-measure_stack (const union any_node *n,
+measure_stack (const struct expr_node *n,
struct stack_heights *height, struct stack_heights *max)
{
const struct stack_heights *return_height;
- if (is_composite (n->type))
+ if (is_composite (n->type))
{
struct stack_heights args;
int i;
args = *height;
- for (i = 0; i < n->composite.arg_cnt; i++)
- measure_stack (n->composite.args[i], &args, max);
+ for (i = 0; i < n->n_args; i++)
+ measure_stack (n->args[i], &args, max);
return_height = atom_type_stack (operations[n->type].returns);
}
/* Allocates stacks within E sufficient for evaluating node N. */
static void
-allocate_stacks (union any_node *n, struct expression *e)
+allocate_stacks (struct expr_node *n, struct expression *e)
{
struct stack_heights initial = {0, 0};
struct stack_heights max = {0, 0};
/* Finalizes expression E for evaluating node N. */
static struct expression *
-finish_expression (union any_node *n, struct expression *e)
+finish_expression (struct expr_node *n, struct expression *e)
{
/* Allocate stacks. */
allocate_stacks (n, e);
converted to type EXPECTED_TYPE, inserting a conversion at *N
if necessary. Returns true if successful, false on failure. */
static bool
-type_check (struct expression *e,
- union any_node **n, enum expr_type expected_type)
+type_check (const struct expression *e, const struct expr_node *n,
+ enum val_type expected_type)
{
- atom_type actual_type = expr_node_returns (*n);
+ atom_type actual_type = expr_node_returns (n);
- switch (expected_type)
+ switch (expected_type)
{
- case EXPR_BOOLEAN:
- case EXPR_NUMBER:
+ case VAL_NUMERIC:
if (actual_type != OP_number && actual_type != OP_boolean)
{
- msg (SE, _("Type mismatch: expression has %s type, "
- "but a numeric value is required here."),
+ msg_at (SE, expr_location (e, n),
+ _("Type mismatch: expression has type '%s', "
+ "but a numeric value is required."),
atom_type_name (actual_type));
return false;
}
- if (actual_type == OP_number && expected_type == OP_boolean)
- *n = expr_allocate_unary (e, OP_NUM_TO_BOOLEAN, *n);
break;
-
- case EXPR_STRING:
+
+ case VAL_STRING:
if (actual_type != OP_string)
{
- msg (SE, _("Type mismatch: expression has %s type, "
- "but a string value is required here."),
+ msg_at (SE, expr_location (e, n),
+ _("Type mismatch: expression has type '%s', "
+ "but a string value is required."),
atom_type_name (actual_type));
return false;
}
default:
NOT_REACHED ();
}
-
+
return true;
}
\f
/* Recursive-descent expression parser. */
-/* Considers whether *NODE may be coerced to type REQUIRED_TYPE.
- Returns true if possible, false if disallowed.
+static void
+free_msg_location (void *loc_)
+{
+ struct msg_location *loc = loc_;
+ msg_location_destroy (loc);
+}
- If DO_COERCION is false, then *NODE is not modified and there
- are no side effects.
+static void
+expr_location__ (struct expression *e,
+ const struct expr_node *node,
+ const struct msg_location **minp,
+ const struct msg_location **maxp)
+{
+ struct msg_location *loc = node->location;
+ if (loc)
+ {
+ const struct msg_location *min = *minp;
+ if (loc->start.line
+ && (!min
+ || loc->start.line < min->start.line
+ || (loc->start.line == min->start.line
+ && loc->start.column < min->start.column)))
+ *minp = loc;
+
+ const struct msg_location *max = *maxp;
+ if (loc->end.line
+ && (!max
+ || loc->end.line > max->end.line
+ || (loc->end.line == max->end.line
+ && loc->end.column > max->end.column)))
+ *maxp = loc;
+
+ return;
+ }
- If DO_COERCION is true, we perform the coercion if possible,
- modifying *NODE if necessary. If the coercion is not possible
- then we free *NODE and set *NODE to a null pointer.
+ if (is_composite (node->type))
+ for (size_t i = 0; i < node->n_args; i++)
+ expr_location__ (e, node->args[i], minp, maxp);
+}
- This function's interface is somewhat awkward. Use one of the
- wrapper functions type_coercion(), type_coercion_assert(), or
- is_coercible() instead. */
-static bool
-type_coercion_core (struct expression *e,
- atom_type required_type,
- union any_node **node,
- const char *operator_name,
- bool do_coercion)
+/* Returns the source code location corresponding to expression NODE, computing
+ it lazily if needed. */
+const struct msg_location *
+expr_location (const struct expression *e_, const struct expr_node *node_)
{
- atom_type actual_type;
+ struct expr_node *node = CONST_CAST (struct expr_node *, node_);
+ if (!node)
+ return NULL;
- assert (!!do_coercion == (e != NULL));
- if (*node == NULL)
+ if (!node->location)
{
- /* Propagate error. Whatever caused the original error
- already emitted an error message. */
- return false;
+ struct expression *e = CONST_CAST (struct expression *, e_);
+ const struct msg_location *min = NULL;
+ const struct msg_location *max = NULL;
+ expr_location__ (e, node, &min, &max);
+ if (min && max)
+ {
+ node->location = msg_location_dup (min);
+ node->location->end = max->end;
+ pool_register (e->expr_pool, free_msg_location, node->location);
+ }
+ }
+ return node->location;
+}
+
+/* Sets e->location to the tokens in S's lexer from offset START_OFS to the
+ token before the current one. Has no effect if E already has a location or
+ if E is null. */
+static void
+expr_add_location (struct lexer *lexer, struct expression *e,
+ int start_ofs, struct expr_node *node)
+{
+ if (node && !node->location)
+ {
+ node->location = lex_ofs_location (lexer, start_ofs, lex_ofs (lexer) - 1);
+ pool_register (e->expr_pool, free_msg_location, node->location);
}
+}
- actual_type = expr_node_returns (*node);
- if (actual_type == required_type)
+static bool
+type_coercion__ (struct expression *e, struct expr_node *node, size_t arg_idx,
+ bool do_coercion)
+{
+ assert (!!do_coercion == (e != NULL));
+
+ if (!node)
+ return false;
+
+ struct expr_node **argp = &node->args[arg_idx];
+ struct expr_node *arg = *argp;
+ if (!arg)
+ return false;
+
+ const struct operation *op = &operations[node->type];
+ atom_type required_type = op->args[MIN (arg_idx, op->n_args - 1)];
+ atom_type actual_type = expr_node_returns (arg);
+ if (actual_type == required_type)
{
/* Type match. */
- return true;
+ return true;
}
- switch (required_type)
+ switch (required_type)
{
case OP_number:
- if (actual_type == OP_boolean)
+ if (actual_type == OP_boolean)
{
/* To enforce strict typing rules, insert Boolean to
numeric "conversion". This conversion is a no-op,
so it will be removed later. */
if (do_coercion)
- *node = expr_allocate_unary (e, OP_BOOLEAN_TO_NUM, *node);
- return true;
+ *argp = expr_allocate_unary (e, OP_BOOLEAN_TO_NUM, arg);
+ return true;
+ }
+ else if (actual_type == OP_num_vec_elem)
+ {
+ if (do_coercion)
+ arg->type = OP_VEC_ELEM_NUM;
+ return true;
}
break;
{
/* Convert numeric to boolean. */
if (do_coercion)
- *node = expr_allocate_unary (e, OP_NUM_TO_BOOLEAN, *node);
+ *argp = expr_allocate_binary (e, OP_OPERAND_TO_BOOLEAN, arg,
+ expr_allocate_expr_node (e, node));
+ return true;
+ }
+ break;
+
+ case OP_integer:
+ if (actual_type == OP_number)
+ {
+ /* Convert number to integer. */
+ if (do_coercion)
+ *argp = expr_allocate_unary (e, OP_NUM_TO_INTEGER, arg);
return true;
}
break;
case OP_format:
+ /* We never coerce to OP_format, only to OP_ni_format or OP_no_format. */
NOT_REACHED ();
case OP_ni_format:
msg_disable ();
- if ((*node)->type == OP_format
- && fmt_check_input (&(*node)->format.f)
- && fmt_check_type_compat (&(*node)->format.f, VAR_NUMERIC))
+ if (arg->type == OP_format
+ && fmt_check_input (&arg->format)
+ && fmt_check_type_compat (&arg->format, VAL_NUMERIC))
{
msg_enable ();
if (do_coercion)
- (*node)->type = OP_ni_format;
+ arg->type = OP_ni_format;
return true;
}
msg_enable ();
case OP_no_format:
msg_disable ();
- if ((*node)->type == OP_format
- && fmt_check_output (&(*node)->format.f)
- && fmt_check_type_compat (&(*node)->format.f, VAR_NUMERIC))
+ if (arg->type == OP_format
+ && fmt_check_output (&arg->format)
+ && fmt_check_type_compat (&arg->format, VAL_NUMERIC))
{
msg_enable ();
if (do_coercion)
- (*node)->type = OP_no_format;
+ arg->type = OP_no_format;
return true;
}
msg_enable ();
break;
case OP_num_var:
- if ((*node)->type == OP_NUM_VAR)
+ if (arg->type == OP_NUM_VAR)
{
if (do_coercion)
- *node = (*node)->composite.args[0];
+ *argp = arg->args[0];
return true;
}
break;
case OP_str_var:
- if ((*node)->type == OP_STR_VAR)
+ if (arg->type == OP_STR_VAR)
{
if (do_coercion)
- *node = (*node)->composite.args[0];
+ *argp = arg->args[0];
return true;
}
break;
case OP_var:
- if ((*node)->type == OP_NUM_VAR || (*node)->type == OP_STR_VAR)
+ if (arg->type == OP_NUM_VAR || arg->type == OP_STR_VAR)
{
if (do_coercion)
- *node = (*node)->composite.args[0];
+ *argp = arg->args[0];
return true;
}
break;
case OP_pos_int:
- if ((*node)->type == OP_number
- && floor ((*node)->number.n) == (*node)->number.n
- && (*node)->number.n > 0 && (*node)->number.n < INT_MAX)
+ if (arg->type == OP_number
+ && floor (arg->number) == arg->number
+ && arg->number > 0 && arg->number < INT_MAX)
{
if (do_coercion)
- *node = expr_allocate_pos_int (e, (*node)->number.n);
+ *argp = expr_allocate_pos_int (e, arg->number);
return true;
}
break;
default:
NOT_REACHED ();
}
-
- if (do_coercion)
- {
- msg (SE, _("Type mismatch while applying %s operator: "
- "cannot convert %s to %s."),
- operator_name,
- atom_type_name (actual_type), atom_type_name (required_type));
- *node = NULL;
- }
return false;
}
-/* Coerces *NODE to type REQUIRED_TYPE, and returns success. If
- *NODE cannot be coerced to the desired type then we issue an
- error message about operator OPERATOR_NAME and free *NODE. */
static bool
-type_coercion (struct expression *e,
- atom_type required_type, union any_node **node,
- const char *operator_name)
-{
- return type_coercion_core (e, required_type, node, operator_name, true);
-}
-
-/* Coerces *NODE to type REQUIRED_TYPE.
- Assert-fails if the coercion is disallowed. */
-static void
-type_coercion_assert (struct expression *e,
- atom_type required_type, union any_node **node)
+type_coercion (struct expression *e, struct expr_node *node, size_t arg_idx)
{
- int success = type_coercion_core (e, required_type, node, NULL, true);
- assert (success);
+ return type_coercion__ (e, node, arg_idx, true);
}
-/* Returns true if *NODE may be coerced to type REQUIRED_TYPE,
- false otherwise. */
static bool
-is_coercible (atom_type required_type, union any_node *const *node)
+is_coercible (const struct expr_node *node_, size_t arg_idx)
{
- return type_coercion_core (NULL, required_type,
- (union any_node **) node, NULL, false);
+ struct expr_node *node = CONST_CAST (struct expr_node *, node_);
+ return type_coercion__ (NULL, node, arg_idx, false);
}
-/* Returns true if ACTUAL_TYPE is a kind of REQUIRED_TYPE, false
- otherwise. */
-static bool
-is_compatible (atom_type required_type, atom_type actual_type)
-{
- return (required_type == actual_type
- || (required_type == OP_var
- && (actual_type == OP_num_var || actual_type == OP_str_var)));
-}
+/* How to parse an operator.
-/* How to parse an operator. */
+ Some operators support both numeric and string operators. For those,
+ 'num_op' and 'str_op' are both nonzero. Otherwise, only one 'num_op' is
+ nonzero. (PSPP doesn't have any string-only operators.) */
struct operator
{
- int token; /* Token representing operator. */
- operation_type type; /* Operation type representing operation. */
- const char *name; /* Name of operator. */
+ enum token_type token; /* Operator token. */
+ operation_type num_op; /* Operation for numeric operands (or 0). */
+ operation_type str_op; /* Operation for string operands (or 0). */
};
-/* Attempts to match the current token against the tokens for the
- OP_CNT operators in OPS[]. If successful, returns true
- and, if OPERATOR is non-null, sets *OPERATOR to the operator.
- On failure, returns false and, if OPERATOR is non-null, sets
- *OPERATOR to a null pointer. */
-static bool
-match_operator (struct lexer *lexer, const struct operator ops[], size_t op_cnt,
- const struct operator **operator)
+static operation_type
+match_operator (struct lexer *lexer, const struct operator ops[], size_t n_ops,
+ const struct expr_node *lhs)
{
- const struct operator *op;
+ bool lhs_is_numeric = operations[lhs->type].returns != OP_string;
+ for (const struct operator *op = ops; op < ops + n_ops; op++)
+ if (lex_token (lexer) == op->token)
+ {
+ if (op->token != T_NEG_NUM)
+ lex_get (lexer);
- for (op = ops; op < ops + op_cnt; op++)
- {
- if (op->token == '-')
- lex_negative_to_dash (lexer);
- if (lex_match (lexer, op->token))
- {
- if (operator != NULL)
- *operator = op;
- return true;
- }
- }
- if (operator != NULL)
- *operator = NULL;
- return false;
+ return op->str_op && !lhs_is_numeric ? op->str_op : op->num_op;
+ }
+ return 0;
}
-static bool
-check_operator (const struct operator *op, int arg_cnt, atom_type arg_type)
+static const char *
+operator_name (enum token_type token)
{
- const struct operation *o;
- size_t i;
-
- assert (op != NULL);
- o = &operations[op->type];
- assert (o->arg_cnt == arg_cnt);
- assert ((o->flags & OPF_ARRAY_OPERAND) == 0);
- for (i = 0; i < arg_cnt; i++)
- assert (is_compatible (arg_type, o->args[i]));
- return true;
+ return token == T_NEG_NUM ? "-" : token_type_to_string (token);
}
-static bool
-check_binary_operators (const struct operator ops[], size_t op_cnt,
- atom_type arg_type)
+static struct expr_node *
+parse_binary_operators__ (struct lexer *lexer, struct expression *e,
+ const struct operator ops[], size_t n_ops,
+ parse_recursively_func *parse_next_level,
+ const char *chain_warning, struct expr_node *lhs)
{
- size_t i;
+ for (int op_count = 0; ; op_count++)
+ {
+ enum token_type token = lex_token (lexer);
+ operation_type optype = match_operator (lexer, ops, n_ops, lhs);
+ if (!optype)
+ {
+ if (op_count > 1 && chain_warning)
+ msg_at (SW, expr_location (e, lhs), "%s", chain_warning);
- for (i = 0; i < op_cnt; i++)
- check_operator (&ops[i], 2, arg_type);
- return true;
-}
+ return lhs;
+ }
-static atom_type
-get_operand_type (const struct operator *op)
-{
- return operations[op->type].args[0];
-}
+ struct expr_node *rhs = parse_next_level (lexer, e);
+ if (!rhs)
+ return NULL;
-/* Parses a chain of left-associative operator/operand pairs.
- There are OP_CNT operators, specified in OPS[]. The
- operators' operands must all be the same type. The next
- higher level is parsed by PARSE_NEXT_LEVEL. If CHAIN_WARNING
- is non-null, then it will be issued as a warning if more than
- one operator/operand pair is parsed. */
-static union any_node *
-parse_binary_operators (struct lexer *lexer, struct expression *e, union any_node *node,
- const struct operator ops[], size_t op_cnt,
- parse_recursively_func *parse_next_level,
- const char *chain_warning)
-{
- atom_type operand_type = get_operand_type (&ops[0]);
- int op_count;
- const struct operator *operator;
+ struct expr_node *node = expr_allocate_binary (e, optype, lhs, rhs);
+ if (!is_coercible (node, 0) || !is_coercible (node, 1))
+ {
+ bool both = false;
+ for (size_t i = 0; i < n_ops; i++)
+ if (ops[i].token == token)
+ both = ops[i].num_op && ops[i].str_op;
+
+ const char *name = operator_name (token);
+ if (both)
+ msg_at (SE, expr_location (e, node),
+ _("Both operands of %s must have the same type."), name);
+ else if (operations[node->type].args[0] != OP_string)
+ msg_at (SE, expr_location (e, node),
+ _("Both operands of %s must be numeric."), name);
+ else
+ NOT_REACHED ();
- assert (check_binary_operators (ops, op_cnt, operand_type));
- if (node == NULL)
- return node;
+ msg_at (SN, expr_location (e, node->args[0]),
+ _("This operand has type '%s'."),
+ atom_type_name (expr_node_returns (node->args[0])));
+ msg_at (SN, expr_location (e, node->args[1]),
+ _("This operand has type '%s'."),
+ atom_type_name (expr_node_returns (node->args[1])));
- for (op_count = 0; match_operator (lexer, ops, op_cnt, &operator); op_count++)
- {
- union any_node *rhs;
+ return NULL;
+ }
- /* Convert the left-hand side to type OPERAND_TYPE. */
- if (!type_coercion (e, operand_type, &node, operator->name))
- return NULL;
+ if (!type_coercion (e, node, 0) || !type_coercion (e, node, 1))
+ NOT_REACHED ();
- /* Parse the right-hand side and coerce to type
- OPERAND_TYPE. */
- rhs = parse_next_level (lexer, e);
- if (!type_coercion (e, operand_type, &rhs, operator->name))
- return NULL;
- node = expr_allocate_binary (e, operator->type, node, rhs);
+ lhs = node;
}
+}
- if (op_count > 1 && chain_warning != NULL)
- msg (SW, chain_warning);
+static struct expr_node *
+parse_binary_operators (struct lexer *lexer, struct expression *e,
+ const struct operator ops[], size_t n_ops,
+ parse_recursively_func *parse_next_level,
+ const char *chain_warning)
+{
+ struct expr_node *lhs = parse_next_level (lexer, e);
+ if (!lhs)
+ return NULL;
- return node;
+ return parse_binary_operators__ (lexer, e, ops, n_ops, parse_next_level,
+ chain_warning, lhs);
}
-static union any_node *
+static struct expr_node *
parse_inverting_unary_operator (struct lexer *lexer, struct expression *e,
const struct operator *op,
- parse_recursively_func *parse_next_level)
+ parse_recursively_func *parse_next_level)
{
- union any_node *node;
- unsigned op_count;
+ int start_ofs = lex_ofs (lexer);
+ unsigned int op_count = 0;
+ while (lex_match (lexer, op->token))
+ op_count++;
- check_operator (op, 1, get_operand_type (op));
+ struct expr_node *inner = parse_next_level (lexer, e);
+ if (!inner || !op_count)
+ return inner;
- op_count = 0;
- while (match_operator (lexer, op, 1, NULL))
- op_count++;
+ struct expr_node *outer = expr_allocate_unary (e, op->num_op, inner);
+ expr_add_location (lexer, e, start_ofs, outer);
- node = parse_next_level (lexer, e);
- if (op_count > 0
- && type_coercion (e, get_operand_type (op), &node, op->name)
- && op_count % 2 != 0)
- return expr_allocate_unary (e, op->type, node);
- else
- return node;
+ if (!type_coercion (e, outer, 0))
+ {
+ assert (operations[outer->type].args[0] != OP_string);
+
+ const char *name = operator_name (op->token);
+ msg_at (SE, expr_location (e, outer),
+ _("The unary %s operator requires a numeric operand."), name);
+
+ msg_at (SN, expr_location (e, outer->args[0]),
+ _("The operand of %s has type '%s'."),
+ name, atom_type_name (expr_node_returns (outer->args[0])));
+
+ return NULL;
+ }
+
+ return op_count % 2 ? outer : outer->args[0];
}
/* Parses the OR level. */
-static union any_node *
+static struct expr_node *
parse_or (struct lexer *lexer, struct expression *e)
{
- static const struct operator op =
- { T_OR, OP_OR, "logical disjunction (\"OR\")" };
-
- return parse_binary_operators (lexer, e, parse_and (lexer, e), &op, 1, parse_and, NULL);
+ static const struct operator op = { .token = T_OR, .num_op = OP_OR };
+ return parse_binary_operators (lexer, e, &op, 1, parse_and, NULL);
}
/* Parses the AND level. */
-static union any_node *
+static struct expr_node *
parse_and (struct lexer *lexer, struct expression *e)
{
- static const struct operator op =
- { T_AND, OP_AND, "logical conjunction (\"AND\")" };
-
- return parse_binary_operators (lexer, e, parse_not (lexer, e),
- &op, 1, parse_not, NULL);
+ static const struct operator op = { .token = T_AND, .num_op = OP_AND };
+
+ return parse_binary_operators (lexer, e, &op, 1, parse_not, NULL);
}
/* Parses the NOT level. */
-static union any_node *
+static struct expr_node *
parse_not (struct lexer *lexer, struct expression *e)
{
- static const struct operator op
- = { T_NOT, OP_NOT, "logical negation (\"NOT\")" };
+ static const struct operator op = { .token = T_NOT, .num_op = OP_NOT };
return parse_inverting_unary_operator (lexer, e, &op, parse_rel);
}
/* Parse relational operators. */
-static union any_node *
+static struct expr_node *
parse_rel (struct lexer *lexer, struct expression *e)
{
- const char *chain_warning =
- _("Chaining relational operators (e.g. \"a < b < c\") will "
+ const char *chain_warning =
+ _("Chaining relational operators (e.g. `a < b < c') will "
"not produce the mathematically expected result. "
"Use the AND logical operator to fix the problem "
- "(e.g. \"a < b AND b < c\"). "
- "If chaining is really intended, parentheses will disable "
- "this warning (e.g. \"(a < b) < c\".)");
-
- union any_node *node = parse_add (lexer, e);
+ "(e.g. `a < b AND b < c'). "
+ "To disable this warning, insert parentheses.");
- if (node == NULL)
- return NULL;
-
- switch (expr_node_returns (node))
+ static const struct operator ops[] =
{
- case OP_number:
- case OP_boolean:
- {
- static const struct operator ops[] =
- {
- { '=', OP_EQ, "numeric equality (\"=\")" },
- { T_EQ, OP_EQ, "numeric equality (\"EQ\")" },
- { T_GE, OP_GE, "numeric greater-than-or-equal-to (\">=\")" },
- { T_GT, OP_GT, "numeric greater than (\">\")" },
- { T_LE, OP_LE, "numeric less-than-or-equal-to (\"<=\")" },
- { T_LT, OP_LT, "numeric less than (\"<\")" },
- { T_NE, OP_NE, "numeric inequality (\"<>\")" },
- };
-
- return parse_binary_operators (lexer, e, node, ops,
- sizeof ops / sizeof *ops,
- parse_add, chain_warning);
- }
-
- case OP_string:
- {
- static const struct operator ops[] =
- {
- { '=', OP_EQ_STRING, "string equality (\"=\")" },
- { T_EQ, OP_EQ_STRING, "string equality (\"EQ\")" },
- { T_GE, OP_GE_STRING, "string greater-than-or-equal-to (\">=\")" },
- { T_GT, OP_GT_STRING, "string greater than (\">\")" },
- { T_LE, OP_LE_STRING, "string less-than-or-equal-to (\"<=\")" },
- { T_LT, OP_LT_STRING, "string less than (\"<\")" },
- { T_NE, OP_NE_STRING, "string inequality (\"<>\")" },
- };
-
- return parse_binary_operators (lexer, e, node, ops,
- sizeof ops / sizeof *ops,
- parse_add, chain_warning);
- }
-
- default:
- return node;
- }
+ { .token = T_EQUALS, .num_op = OP_EQ, .str_op = OP_EQ_STRING },
+ { .token = T_EQ, .num_op = OP_EQ, .str_op = OP_EQ_STRING },
+ { .token = T_GE, .num_op = OP_GE, .str_op = OP_GE_STRING },
+ { .token = T_GT, .num_op = OP_GT, .str_op = OP_GT_STRING },
+ { .token = T_LE, .num_op = OP_LE, .str_op = OP_LE_STRING },
+ { .token = T_LT, .num_op = OP_LT, .str_op = OP_LT_STRING },
+ { .token = T_NE, .num_op = OP_NE, .str_op = OP_NE_STRING },
+ };
+
+ return parse_binary_operators (lexer, e, ops, sizeof ops / sizeof *ops,
+ parse_add, chain_warning);
}
/* Parses the addition and subtraction level. */
-static union any_node *
+static struct expr_node *
parse_add (struct lexer *lexer, struct expression *e)
{
- static const struct operator ops[] =
+ static const struct operator ops[] =
{
- { '+', OP_ADD, "addition (\"+\")" },
- { '-', OP_SUB, "subtraction (\"-\")" },
+ { .token = T_PLUS, .num_op = OP_ADD },
+ { .token = T_DASH, .num_op = OP_SUB },
+ { .token = T_NEG_NUM, .num_op = OP_ADD },
};
-
- return parse_binary_operators (lexer, e, parse_mul (lexer, e),
- ops, sizeof ops / sizeof *ops,
+
+ return parse_binary_operators (lexer, e, ops, sizeof ops / sizeof *ops,
parse_mul, NULL);
}
/* Parses the multiplication and division level. */
-static union any_node *
+static struct expr_node *
parse_mul (struct lexer *lexer, struct expression *e)
{
- static const struct operator ops[] =
+ static const struct operator ops[] =
{
- { '*', OP_MUL, "multiplication (\"*\")" },
- { '/', OP_DIV, "division (\"/\")" },
+ { .token = T_ASTERISK, .num_op = OP_MUL },
+ { .token = T_SLASH, .num_op = OP_DIV },
};
-
- return parse_binary_operators (lexer, e, parse_neg (lexer, e),
- ops, sizeof ops / sizeof *ops,
+
+ return parse_binary_operators (lexer, e, ops, sizeof ops / sizeof *ops,
parse_neg, NULL);
}
/* Parses the unary minus level. */
-static union any_node *
+static struct expr_node *
parse_neg (struct lexer *lexer, struct expression *e)
{
- static const struct operator op = { '-', OP_NEG, "negation (\"-\")" };
+ static const struct operator op = { .token = T_DASH, .num_op = OP_NEG };
return parse_inverting_unary_operator (lexer, e, &op, parse_exp);
}
-static union any_node *
+static struct expr_node *
parse_exp (struct lexer *lexer, struct expression *e)
{
- static const struct operator op =
- { T_EXP, OP_POW, "exponentiation (\"**\")" };
-
- const char *chain_warning =
- _("The exponentiation operator (\"**\") is left-associative, "
- "even though right-associative semantics are more useful. "
- "That is, \"a**b**c\" equals \"(a**b)**c\", not as \"a**(b**c)\". "
+ static const struct operator op = { .token = T_EXP, .num_op = OP_POW };
+
+ const char *chain_warning =
+ _("The exponentiation operator (`**') is left-associative: "
+ "`a**b**c' equals `(a**b)**c', not `a**(b**c)'. "
"To disable this warning, insert parentheses.");
- return parse_binary_operators (lexer, e, parse_primary (lexer, e), &op, 1,
- parse_primary, chain_warning);
+ if (lex_token (lexer) != T_NEG_NUM || lex_next_token (lexer, 1) != T_EXP)
+ return parse_binary_operators (lexer, e, &op, 1,
+ parse_primary, chain_warning);
+
+ /* Special case for situations like "-5**6", which must be parsed as
+ -(5**6). */
+
+ int start_ofs = lex_ofs (lexer);
+ struct expr_node *lhs = expr_allocate_number (e, -lex_tokval (lexer));
+ lex_get (lexer);
+ expr_add_location (lexer, e, start_ofs, lhs);
+
+ struct expr_node *node = parse_binary_operators__ (
+ lexer, e, &op, 1, parse_primary, chain_warning, lhs);
+ if (!node)
+ return NULL;
+
+ node = expr_allocate_unary (e, OP_NEG, node);
+ expr_add_location (lexer, e, start_ofs, node);
+ return node;
+}
+
+static double
+ymd_to_offset (int y, int m, int d)
+{
+ char *error;
+ double retval = calendar_gregorian_to_offset (
+ y, m, d, settings_get_fmt_settings (), &error);
+ if (error)
+ {
+ msg (SE, "%s", error);
+ free (error);
+ }
+ return retval;
+}
+
+static struct expr_node *
+expr_date (struct expression *e, int year_digits)
+{
+ static const char *months[12] =
+ {
+ "JAN", "FEB", "MAR", "APR", "MAY", "JUN",
+ "JUL", "AUG", "SEP", "OCT", "NOV", "DEC",
+ };
+
+ time_t last_proc_time = time_of_last_procedure (e->ds);
+ struct tm *time = localtime (&last_proc_time);
+
+ char *tmp = (year_digits == 2
+ ? xasprintf ("%02d-%s-%02d", time->tm_mday, months[time->tm_mon],
+ time->tm_year % 100)
+ : xasprintf ("%02d-%s-%04d", time->tm_mday, months[time->tm_mon],
+ time->tm_year + 1900));
+
+ struct substring s;
+ ss_alloc_substring_pool (&s, ss_cstr (tmp), e->expr_pool);
+
+ free (tmp);
+
+ return expr_allocate_string (e, s);
}
/* Parses system variables. */
-static union any_node *
+static struct expr_node *
parse_sysvar (struct lexer *lexer, struct expression *e)
{
if (lex_match_id (lexer, "$CASENUM"))
return expr_allocate_nullary (e, OP_CASENUM);
else if (lex_match_id (lexer, "$DATE"))
- {
- static const char *months[12] =
- {
- "JAN", "FEB", "MAR", "APR", "MAY", "JUN",
- "JUL", "AUG", "SEP", "OCT", "NOV", "DEC",
- };
-
- time_t last_proc_time = time_of_last_procedure (e->ds);
- struct tm *time;
- char temp_buf[10];
-
- time = localtime (&last_proc_time);
- sprintf (temp_buf, "%02d %s %02d", abs (time->tm_mday) % 100,
- months[abs (time->tm_mon) % 12], abs (time->tm_year) % 100);
-
- return expr_allocate_string_buffer (e, temp_buf, strlen (temp_buf));
- }
+ return expr_date (e, 2);
+ else if (lex_match_id (lexer, "$DATE11"))
+ return expr_date (e, 4);
else if (lex_match_id (lexer, "$TRUE"))
return expr_allocate_boolean (e, 1.0);
else if (lex_match_id (lexer, "$FALSE"))
{
time_t time = time_of_last_procedure (e->ds);
struct tm *tm = localtime (&time);
- return expr_allocate_number (e, expr_ymd_to_ofs (tm->tm_year + 1900,
- tm->tm_mon + 1,
- tm->tm_mday));
+ return expr_allocate_number (e, ymd_to_offset (tm->tm_year + 1900,
+ tm->tm_mon + 1,
+ tm->tm_mday));
}
else if (lex_match_id (lexer, "$TIME"))
{
time_t time = time_of_last_procedure (e->ds);
struct tm *tm = localtime (&time);
- return expr_allocate_number (e,
- expr_ymd_to_date (tm->tm_year + 1900,
+ return expr_allocate_number (e, ymd_to_offset (tm->tm_year + 1900,
tm->tm_mon + 1,
- tm->tm_mday)
+ tm->tm_mday) * DAY_S
+ tm->tm_hour * 60 * 60.
+ tm->tm_min * 60.
+ tm->tm_sec);
}
else if (lex_match_id (lexer, "$LENGTH"))
- return expr_allocate_number (e, get_viewlength ());
+ return expr_allocate_number (e, settings_get_viewlength ());
else if (lex_match_id (lexer, "$WIDTH"))
- return expr_allocate_number (e, get_viewwidth ());
+ return expr_allocate_number (e, settings_get_viewwidth ());
else
{
- msg (SE, _("Unknown system variable %s."), lex_tokid (lexer));
+ msg (SE, _("Unknown system variable %s."), lex_tokcstr (lexer));
return NULL;
}
}
/* Parses numbers, varnames, etc. */
-static union any_node *
-parse_primary (struct lexer *lexer, struct expression *e)
+static struct expr_node *
+parse_primary__ (struct lexer *lexer, struct expression *e)
{
switch (lex_token (lexer))
{
case T_ID:
- if (lex_look_ahead (lexer) == '(')
+ if (lex_next_token (lexer, 1) == T_LPAREN)
{
/* An identifier followed by a left parenthesis may be
a vector element reference. If not, it's a function
call. */
- if (e->ds != NULL && dict_lookup_vector (dataset_dict (e->ds), lex_tokid (lexer)) != NULL)
+ if (e->ds != NULL && dict_lookup_vector (dataset_dict (e->ds), lex_tokcstr (lexer)) != NULL)
return parse_vector_element (lexer, e);
else
return parse_function (lexer, e);
}
- else if (lex_tokid (lexer)[0] == '$')
+ else if (lex_tokcstr (lexer)[0] == '$')
{
/* $ at the beginning indicates a system variable. */
return parse_sysvar (lexer, e);
}
- else if (e->ds != NULL && dict_lookup_var (dataset_dict (e->ds), lex_tokid (lexer)))
+ else if (e->ds != NULL && dict_lookup_var (dataset_dict (e->ds), lex_tokcstr (lexer)))
{
/* It looks like a user variable.
(It could be a format specifier, but we'll assume
it's a variable unless proven otherwise. */
return allocate_unary_variable (e, parse_variable (lexer, dataset_dict (e->ds)));
}
- else
+ else
{
/* Try to parse it as a format specifier. */
struct fmt_spec fmt;
bool ok;
-
+
msg_disable ();
ok = parse_format_specifier (lexer, &fmt);
msg_enable ();
return expr_allocate_format (e, &fmt);
/* All attempts failed. */
- msg (SE, _("Unknown identifier %s."), lex_tokid (lexer));
+ msg (SE, _("Unknown identifier %s."), lex_tokcstr (lexer));
return NULL;
}
break;
-
- case T_POS_NUM:
- case T_NEG_NUM:
+
+ case T_POS_NUM:
+ case T_NEG_NUM:
{
- union any_node *node = expr_allocate_number (e, lex_tokval (lexer) );
+ struct expr_node *node = expr_allocate_number (e, lex_tokval (lexer));
lex_get (lexer);
- return node;
+ return node;
}
case T_STRING:
{
- union any_node *node = expr_allocate_string_buffer (
- e, ds_cstr (lex_tokstr (lexer) ), ds_length (lex_tokstr (lexer) ));
+ const char *dict_encoding;
+ struct expr_node *node;
+ char *s;
+
+ dict_encoding = (e->ds != NULL
+ ? dict_get_encoding (dataset_dict (e->ds))
+ : "UTF-8");
+ s = recode_string_pool (dict_encoding, "UTF-8", lex_tokcstr (lexer),
+ ss_length (lex_tokss (lexer)), e->expr_pool);
+ node = expr_allocate_string (e, ss_cstr (s));
+
lex_get (lexer);
return node;
}
- case '(':
+ case T_LPAREN:
{
- union any_node *node;
- lex_get (lexer);
- node = parse_or (lexer, e);
- if (node != NULL && !lex_match (lexer, ')'))
- {
- lex_error (lexer, _("expecting `)'"));
- return NULL;
- }
- return node;
+ lex_get (lexer);
+ struct expr_node *node = parse_or (lexer, e);
+ return !node || !lex_force_match (lexer, T_RPAREN) ? NULL : node;
}
default:
- lex_error (lexer, _("in expression"));
+ lex_error (lexer, NULL);
return NULL;
}
}
-static union any_node *
+static struct expr_node *
+parse_primary (struct lexer *lexer, struct expression *e)
+{
+ int start_ofs = lex_ofs (lexer);
+ struct expr_node *node = parse_primary__ (lexer, e);
+ expr_add_location (lexer, e, start_ofs, node);
+ return node;
+}
+
+static struct expr_node *
parse_vector_element (struct lexer *lexer, struct expression *e)
{
- const struct vector *vector;
- union any_node *element;
+ int vector_start_ofs = lex_ofs (lexer);
/* Find vector, skip token.
The caller must already have verified that the current token
is the name of a vector. */
- vector = dict_lookup_vector (dataset_dict (e->ds), lex_tokid (lexer));
+ const struct vector *vector = dict_lookup_vector (dataset_dict (e->ds),
+ lex_tokcstr (lexer));
assert (vector != NULL);
lex_get (lexer);
/* Skip left parenthesis token.
The caller must have verified that the lookahead is a left
parenthesis. */
- assert (lex_token (lexer) == '(');
+ assert (lex_token (lexer) == T_LPAREN);
lex_get (lexer);
- element = parse_or (lexer, e);
- if (!type_coercion (e, OP_number, &element, "vector indexing")
- || !lex_match (lexer, ')'))
+ int element_start_ofs = lex_ofs (lexer);
+ struct expr_node *element = parse_or (lexer, e);
+ if (!element)
return NULL;
+ expr_add_location (lexer, e, element_start_ofs, element);
+
+ if (!lex_match (lexer, T_RPAREN))
+ return NULL;
+
+ operation_type type = (vector_get_type (vector) == VAL_NUMERIC
+ ? OP_VEC_ELEM_NUM_RAW : OP_VEC_ELEM_STR);
+ struct expr_node *node = expr_allocate_binary (
+ e, type, element, expr_allocate_vector (e, vector));
+ expr_add_location (lexer, e, vector_start_ofs, node);
+
+ if (!type_coercion (e, node, 0))
+ {
+ msg_at (SE, expr_location (e, node),
+ _("A vector index must be numeric."));
- return expr_allocate_binary (e, (vector_get_type (vector) == VAR_NUMERIC
- ? OP_VEC_ELEM_NUM : OP_VEC_ELEM_STR),
- element, expr_allocate_vector (e, vector));
+ msg_at (SN, expr_location (e, node->args[0]),
+ _("This vector index has type '%s'."),
+ atom_type_name (expr_node_returns (node->args[0])));
+
+ return NULL;
+ }
+
+ return node;
}
\f
/* Individual function parsing. */
-const struct operation operations[OP_first + OP_cnt] = {
+const struct operation operations[OP_first + n_OP] = {
#include "parse.inc"
};
-
+
static bool
-word_matches (const char **test, const char **name)
+word_matches (const char **test, const char **name)
{
size_t test_len = strcspn (*test, ".");
size_t name_len = strcspn (*name, ".");
- if (test_len == name_len)
+ if (test_len == name_len)
{
if (buf_compare_case (*test, *name, test_len))
return false;
}
else if (test_len < 3 || test_len > name_len)
return false;
- else
+ else
{
if (buf_compare_case (*test, *name, test_len))
return false;
return true;
}
+/* Returns 0 if TOKEN and FUNC do not match,
+ 1 if TOKEN is an acceptable abbreviation for FUNC,
+ 2 if TOKEN equals FUNC. */
static int
-compare_names (const char *test, const char *name, bool abbrev_ok)
+compare_function_names (const char *token_, const char *func_)
{
- if (!abbrev_ok)
- return true;
-
- for (;;)
- {
- if (!word_matches (&test, &name))
- return true;
- if (*name == '\0' && *test == '\0')
- return false;
- }
+ const char *token = token_;
+ const char *func = func_;
+ while (*token || *func)
+ if (!word_matches (&token, &func))
+ return 0;
+ return !c_strcasecmp (token_, func_) ? 2 : 1;
}
-static int
-compare_strings (const char *test, const char *name, bool abbrev_ok UNUSED)
+static bool
+lookup_function (const char *token,
+ const struct operation **first,
+ const struct operation **last)
{
- return strcasecmp (test, name);
-}
+ *first = *last = NULL;
+ const struct operation *best = NULL;
-static bool
-lookup_function_helper (const char *name,
- int (*compare) (const char *test, const char *name,
- bool abbrev_ok),
- const struct operation **first,
- const struct operation **last)
-{
- const struct operation *f;
-
- for (f = operations + OP_function_first;
- f <= operations + OP_function_last; f++)
- if (!compare (name, f->name, !(f->flags & OPF_NO_ABBREV)))
- {
- *first = f;
+ for (const struct operation *f = operations + OP_function_first;
+ f <= operations + OP_function_last; f++)
+ {
+ int score = compare_function_names (token, f->name);
+ if (score == 2)
+ {
+ best = f;
+ break;
+ }
+ else if (score == 1 && !(f->flags & OPF_NO_ABBREV) && !best)
+ best = f;
+ }
- while (f <= operations + OP_function_last
- && !compare (name, f->name, !(f->flags & OPF_NO_ABBREV)))
- f++;
- *last = f;
+ if (!best)
+ return false;
- return true;
- }
+ *first = best;
- return false;
-}
+ const struct operation *f = best;
+ while (f <= operations + OP_function_last
+ && !c_strcasecmp (f->name, best->name))
+ f++;
+ *last = f;
-static bool
-lookup_function (const char *name,
- const struct operation **first,
- const struct operation **last)
-{
- *first = *last = NULL;
- return (lookup_function_helper (name, compare_strings, first, last)
- || lookup_function_helper (name, compare_names, first, last));
+ return true;
}
static int
-extract_min_valid (char *s)
+extract_min_valid (const char *s)
{
char *p = strrchr (s, '.');
if (p == NULL
return atoi (p + 1);
}
-static atom_type
-function_arg_type (const struct operation *f, size_t arg_idx)
-{
- assert (arg_idx < f->arg_cnt || (f->flags & OPF_ARRAY_OPERAND));
-
- return f->args[arg_idx < f->arg_cnt ? arg_idx : f->arg_cnt - 1];
-}
-
static bool
-match_function (union any_node **args, int arg_cnt, const struct operation *f)
+match_function__ (struct expr_node *node, const struct operation *f)
{
- size_t i;
-
- if (arg_cnt < f->arg_cnt
- || (arg_cnt > f->arg_cnt && (f->flags & OPF_ARRAY_OPERAND) == 0)
- || arg_cnt - (f->arg_cnt - 1) < f->array_min_elems)
+ if (node->n_args < f->n_args
+ || (node->n_args > f->n_args && (f->flags & OPF_ARRAY_OPERAND) == 0)
+ || node->n_args - (f->n_args - 1) < f->array_min_elems)
return false;
- for (i = 0; i < arg_cnt; i++)
- if (!is_coercible (function_arg_type (f, i), &args[i]))
- return false;
+ node->type = f - operations;
+ for (size_t i = 0; i < node->n_args; i++)
+ if (!is_coercible (node, i))
+ return false;
return true;
}
-static void
-coerce_function_args (struct expression *e, const struct operation *f,
- union any_node **args, size_t arg_cnt)
+static const struct operation *
+match_function (struct expr_node *node,
+ const struct operation *first, const struct operation *last)
{
- int i;
-
- for (i = 0; i < arg_cnt; i++)
- type_coercion_assert (e, function_arg_type (f, i), &args[i]);
+ for (const struct operation *f = first; f < last; f++)
+ if (match_function__ (node, f))
+ return f;
+ return NULL;
}
static bool
-validate_function_args (const struct operation *f, int arg_cnt, int min_valid)
+validate_function_args (const struct expression *e, const struct expr_node *n,
+ const struct operation *f, int n_args, int min_valid)
{
- int array_arg_cnt = arg_cnt - (f->arg_cnt - 1);
- if (array_arg_cnt < f->array_min_elems)
- {
- msg (SE, _("%s must have at least %d arguments in list."),
- f->prototype, f->array_min_elems);
- return false;
- }
+ /* Count the function arguments that go into the trailing array (if any). We
+ know that there must be at least the minimum number because
+ match_function() already checked. */
+ int array_n_args = n_args - (f->n_args - 1);
+ assert (array_n_args >= f->array_min_elems);
if ((f->flags & OPF_ARRAY_OPERAND)
- && array_arg_cnt % f->array_granularity != 0)
+ && array_n_args % f->array_granularity != 0)
{
- if (f->array_granularity == 2)
- msg (SE, _("%s must have even number of arguments in list."),
- f->prototype);
- else
- msg (SE, _("%s must have multiple of %d arguments in list."),
- f->prototype, f->array_granularity);
+ /* RANGE is the only case we have so far. It has paired arguments with
+ one initial argument, and that's the only special case we deal with
+ here. */
+ assert (f->array_granularity == 2);
+ assert (n_args % 2 == 0);
+ msg_at (SE, expr_location (e, n),
+ _("%s must have an odd number of arguments."), f->prototype);
return false;
}
-
- if (min_valid != -1)
+
+ if (min_valid != -1)
{
- if (f->array_min_elems == 0)
+ if (f->array_min_elems == 0)
{
assert ((f->flags & OPF_MIN_VALID) == 0);
- msg (SE, _("%s function does not accept a minimum valid "
- "argument count."), f->prototype);
+ msg_at (SE, expr_location (e, n),
+ _("%s function cannot accept suffix .%d to specify the "
+ "minimum number of valid arguments."),
+ f->prototype, min_valid);
return false;
}
- else
+ else
{
assert (f->flags & OPF_MIN_VALID);
- if (array_arg_cnt < f->array_min_elems)
+ if (min_valid > array_n_args)
{
- msg (SE, _("%s requires at least %d valid arguments in list."),
- f->prototype, f->array_min_elems);
- return false;
- }
- else if (min_valid > array_arg_cnt)
- {
- msg (SE, _("With %s, "
- "using minimum valid argument count of %d "
- "does not make sense when passing only %d "
- "arguments in list."),
- f->prototype, min_valid, array_arg_cnt);
+ msg_at (SE, expr_location (e, n),
+ _("For %s with %d arguments, at most %d (not %d) may be "
+ "required to be valid."),
+ f->prototype, n_args, array_n_args, min_valid);
return false;
}
}
}
static void
-add_arg (union any_node ***args, int *arg_cnt, int *arg_cap,
- union any_node *arg)
+add_arg (struct expr_node ***args, size_t *n_args, size_t *allocated_args,
+ struct expr_node *arg,
+ struct expression *e, struct lexer *lexer, int arg_start_ofs)
{
- if (*arg_cnt >= *arg_cap)
- {
- *arg_cap += 8;
- *args = xrealloc (*args, sizeof **args * *arg_cap);
- }
+ if (*n_args >= *allocated_args)
+ *args = x2nrealloc (*args, allocated_args, sizeof **args);
- (*args)[(*arg_cnt)++] = arg;
+ expr_add_location (lexer, e, arg_start_ofs, arg);
+ (*args)[(*n_args)++] = arg;
}
static void
put_invocation (struct string *s,
- const char *func_name, union any_node **args, size_t arg_cnt)
+ const char *func_name, struct expr_node *node)
{
size_t i;
ds_put_format (s, "%s(", func_name);
- for (i = 0; i < arg_cnt; i++)
+ for (i = 0; i < node->n_args; i++)
{
if (i > 0)
ds_put_cstr (s, ", ");
- ds_put_cstr (s, operations[expr_node_returns (args[i])].prototype);
+ ds_put_cstr (s, operations[expr_node_returns (node->args[i])].prototype);
}
- ds_put_char (s, ')');
+ ds_put_byte (s, ')');
}
static void
-no_match (const char *func_name,
- union any_node **args, size_t arg_cnt,
- const struct operation *first, const struct operation *last)
+no_match (struct expression *e, const char *func_name, struct expr_node *node,
+ const struct operation *ops, size_t n)
{
struct string s;
- const struct operation *f;
ds_init_empty (&s);
- if (last - first == 1)
+ if (n == 1)
{
- ds_put_format (&s, _("Type mismatch invoking %s as "), first->prototype);
- put_invocation (&s, func_name, args, arg_cnt);
+ ds_put_format (&s, _("Type mismatch invoking %s as "), ops->prototype);
+ put_invocation (&s, func_name, node);
}
- else
+ else
{
ds_put_cstr (&s, _("Function invocation "));
- put_invocation (&s, func_name, args, arg_cnt);
+ put_invocation (&s, func_name, node);
ds_put_cstr (&s, _(" does not match any known function. Candidates are:"));
- for (f = first; f < last; f++)
- ds_put_format (&s, "\n%s", f->prototype);
+ for (size_t i = 0; i < n; i++)
+ ds_put_format (&s, "\n%s", ops[i].prototype);
}
- ds_put_char (&s, '.');
+ ds_put_byte (&s, '.');
+
+ msg_at (SE, expr_location (e, node), "%s", ds_cstr (&s));
+
+ if (n == 1 && ops->n_args == node->n_args)
+ {
+ for (size_t i = 0; i < node->n_args; i++)
+ if (!is_coercible (node, i))
+ {
+ atom_type expected = ops->args[i];
+ atom_type actual = expr_node_returns (node->args[i]);
+ if ((expected == OP_ni_format || expected == OP_no_format)
+ && actual == OP_format)
+ {
+ const struct fmt_spec *f = &node->args[i]->format;
+ char *error = fmt_check__ (f, (ops->args[i] == OP_ni_format
+ ? FMT_FOR_INPUT : FMT_FOR_OUTPUT));
+ if (!error)
+ error = fmt_check_type_compat__ (f, VAL_NUMERIC);
+ if (error)
+ {
+ msg_at (SN, expr_location (e, node->args[i]), "%s", error);
+ free (error);
+ }
+ }
+ else
+ msg_at (SN, expr_location (e, node->args[i]),
+ _("This argument has type '%s' but '%s' is required."),
+ atom_type_name (actual), atom_type_name (expected));
+ }
+ }
- msg (SE, "%s", ds_cstr (&s));
-
ds_destroy (&s);
}
-static union any_node *
+static struct expr_node *
parse_function (struct lexer *lexer, struct expression *e)
{
- int min_valid;
- const struct operation *f, *first, *last;
-
- union any_node **args = NULL;
- int arg_cnt = 0;
- int arg_cap = 0;
-
struct string func_name;
+ ds_init_substring (&func_name, lex_tokss (lexer));
- union any_node *n;
+ int min_valid = extract_min_valid (lex_tokcstr (lexer));
- ds_init_string (&func_name, lex_tokstr (lexer));
- min_valid = extract_min_valid (ds_cstr (lex_tokstr (lexer)));
- if (!lookup_function (ds_cstr (lex_tokstr (lexer)), &first, &last))
+ const struct operation *first, *last;
+ if (!lookup_function (lex_tokcstr (lexer), &first, &last))
{
- msg (SE, _("No function or vector named %s."), ds_cstr (lex_tokstr (lexer)));
+ msg (SE, _("No function or vector named %s."), lex_tokcstr (lexer));
ds_destroy (&func_name);
return NULL;
}
+ int func_start_ofs = lex_ofs (lexer);
lex_get (lexer);
- if (!lex_force_match (lexer, '('))
+ if (!lex_force_match (lexer, T_LPAREN))
{
ds_destroy (&func_name);
- return NULL;
+ return NULL;
}
-
- args = NULL;
- arg_cnt = arg_cap = 0;
- if (lex_token (lexer) != ')')
+
+ struct expr_node **args = NULL;
+ size_t n_args = 0;
+ size_t allocated_args = 0;
+ if (lex_token (lexer) != T_RPAREN)
for (;;)
{
+ int arg_start_ofs = lex_ofs (lexer);
if (lex_token (lexer) == T_ID
- && toupper (lex_look_ahead (lexer)) == 'T')
+ && lex_next_token (lexer, 1) == T_TO)
{
- struct variable **vars;
- size_t var_cnt;
- size_t i;
+ const struct variable **vars;
+ size_t n_vars;
- if (!parse_variables (lexer, dataset_dict (e->ds), &vars, &var_cnt, PV_SINGLE))
+ if (!parse_variables_const (lexer, dataset_dict (e->ds),
+ &vars, &n_vars, PV_SINGLE))
goto fail;
- for (i = 0; i < var_cnt; i++)
- add_arg (&args, &arg_cnt, &arg_cap,
- allocate_unary_variable (e, vars[i]));
+ for (size_t i = 0; i < n_vars; i++)
+ add_arg (&args, &n_args, &allocated_args,
+ allocate_unary_variable (e, vars[i]),
+ e, lexer, arg_start_ofs);
free (vars);
}
else
{
- union any_node *arg = parse_or (lexer, e);
+ struct expr_node *arg = parse_or (lexer, e);
if (arg == NULL)
goto fail;
- add_arg (&args, &arg_cnt, &arg_cap, arg);
+ add_arg (&args, &n_args, &allocated_args, arg,
+ e, lexer, arg_start_ofs);
}
- if (lex_match (lexer, ')'))
+ if (lex_match (lexer, T_RPAREN))
break;
- else if (!lex_match (lexer, ','))
+ else if (!lex_match (lexer, T_COMMA))
{
- lex_error (lexer, _("expecting `,' or `)' invoking %s function"),
- first->name);
+ lex_error_expecting (lexer, "`,'", "`)'");
goto fail;
}
}
- for (f = first; f < last; f++)
- if (match_function (args, arg_cnt, f))
- break;
- if (f >= last)
+ struct expr_node *n = expr_allocate_composite (e, first - operations,
+ args, n_args);
+ expr_add_location (lexer, e, func_start_ofs, n);
+ const struct operation *f = match_function (n, first, last);
+ if (!f)
{
- no_match (ds_cstr (&func_name), args, arg_cnt, first, last);
+ no_match (e, ds_cstr (&func_name), n, first, last - first);
goto fail;
}
+ n->type = f - operations;
+ n->min_valid = min_valid != -1 ? min_valid : f->array_min_elems;
- coerce_function_args (e, f, args, arg_cnt);
- if (!validate_function_args (f, arg_cnt, min_valid))
+ for (size_t i = 0; i < n_args; i++)
+ if (!type_coercion (e, n, i))
+ {
+ /* Unreachable because match_function already checked that the
+ arguments were coercible. */
+ NOT_REACHED ();
+ }
+ if (!validate_function_args (e, n, f, n_args, min_valid))
goto fail;
- if ((f->flags & OPF_EXTENSION) && get_syntax () == COMPATIBLE)
- msg (SW, _("%s is a PSPP extension."), f->prototype);
- if (f->flags & OPF_UNIMPLEMENTED)
+ if ((f->flags & OPF_EXTENSION) && settings_get_syntax () == COMPATIBLE)
+ msg_at (SW, expr_location (e, n),
+ _("%s is a PSPP extension."), f->prototype);
+ if (f->flags & OPF_UNIMPLEMENTED)
{
- msg (SE, _("%s is not yet implemented."), f->prototype);
+ msg_at (SE, expr_location (e, n),
+ _("%s is not available in this version of PSPP."), f->prototype);
goto fail;
}
- if ((f->flags & OPF_PERM_ONLY) &&
- proc_in_temporary_transformations (e->ds))
+ if ((f->flags & OPF_PERM_ONLY) &&
+ proc_in_temporary_transformations (e->ds))
{
- msg (SE, _("%s may not appear after TEMPORARY."), f->prototype);
+ msg_at (SE, expr_location (e, n),
+ _("%s may not appear after %s."), f->prototype, "TEMPORARY");
goto fail;
}
-
- n = expr_allocate_composite (e, f - operations, args, arg_cnt);
- n->composite.min_valid = min_valid != -1 ? min_valid : f->array_min_elems;
- if (n->type == OP_LAG_Vn || n->type == OP_LAG_Vs)
+ if (n->type == OP_LAG_Vn || n->type == OP_LAG_Vs)
dataset_need_lag (e->ds, 1);
else if (n->type == OP_LAG_Vnn || n->type == OP_LAG_Vsn)
{
- int n_before;
- assert (n->composite.arg_cnt == 2);
- assert (n->composite.args[1]->type == OP_pos_int);
- n_before = n->composite.args[1]->integer.i;
- dataset_need_lag (e->ds, n_before);
+ assert (n->n_args == 2);
+ assert (n->args[1]->type == OP_pos_int);
+ dataset_need_lag (e->ds, n->args[1]->integer);
}
-
+
free (args);
ds_destroy (&func_name);
return n;
{
struct pool *pool = pool_create ();
struct expression *e = pool_alloc (pool, sizeof *e);
- e->expr_pool = pool;
- e->ds = ds;
- e->eval_pool = pool_create_subpool (e->expr_pool);
- e->ops = NULL;
- e->op_types = NULL;
- e->op_cnt = e->op_cap = 0;
+ *e = (struct expression) {
+ .expr_pool = pool,
+ .ds = ds,
+ .eval_pool = pool_create_subpool (pool),
+ };
return e;
}
atom_type
-expr_node_returns (const union any_node *n)
+expr_node_returns (const struct expr_node *n)
{
assert (n != NULL);
assert (is_operation (n->type));
- if (is_atom (n->type))
+ if (is_atom (n->type))
return n->type;
else if (is_composite (n->type))
return operations[n->type].returns;
atom_type_name (atom_type type)
{
assert (is_atom (type));
- return operations[type].name;
+
+ /* The Boolean type is purely an internal concept that the documentation
+ doesn't mention, so it might confuse users if we talked about them in
+ diagnostics. */
+ return type == OP_boolean ? "number" : operations[type].name;
}
-union any_node *
+struct expr_node *
expr_allocate_nullary (struct expression *e, operation_type op)
{
return expr_allocate_composite (e, op, NULL, 0);
}
-union any_node *
+struct expr_node *
expr_allocate_unary (struct expression *e, operation_type op,
- union any_node *arg0)
+ struct expr_node *arg0)
{
return expr_allocate_composite (e, op, &arg0, 1);
}
-union any_node *
+struct expr_node *
expr_allocate_binary (struct expression *e, operation_type op,
- union any_node *arg0, union any_node *arg1)
+ struct expr_node *arg0, struct expr_node *arg1)
{
- union any_node *args[2];
+ struct expr_node *args[2];
args[0] = arg0;
args[1] = arg1;
return expr_allocate_composite (e, op, args, 2);
}
-static bool
-is_valid_node (union any_node *n)
-{
- const struct operation *op;
- size_t i;
-
- assert (n != NULL);
- assert (is_operation (n->type));
- op = &operations[n->type];
-
- if (!is_atom (n->type))
- {
- struct composite_node *c = &n->composite;
-
- assert (is_composite (n->type));
- assert (c->arg_cnt >= op->arg_cnt);
- for (i = 0; i < op->arg_cnt; i++)
- assert (is_compatible (op->args[i], expr_node_returns (c->args[i])));
- if (c->arg_cnt > op->arg_cnt && !is_operator (n->type))
- {
- assert (op->flags & OPF_ARRAY_OPERAND);
- for (i = 0; i < c->arg_cnt; i++)
- assert (is_compatible (op->args[op->arg_cnt - 1],
- expr_node_returns (c->args[i])));
- }
- }
-
- return true;
-}
-
-union any_node *
+struct expr_node *
expr_allocate_composite (struct expression *e, operation_type op,
- union any_node **args, size_t arg_cnt)
+ struct expr_node **args, size_t n_args)
{
- union any_node *n;
- size_t i;
+ for (size_t i = 0; i < n_args; i++)
+ if (!args[i])
+ return NULL;
- n = pool_alloc (e->expr_pool, sizeof n->composite);
- n->type = op;
- n->composite.arg_cnt = arg_cnt;
- n->composite.args = pool_alloc (e->expr_pool,
- sizeof *n->composite.args * arg_cnt);
- for (i = 0; i < arg_cnt; i++)
- {
- if (args[i] == NULL)
- return NULL;
- n->composite.args[i] = args[i];
- }
- memcpy (n->composite.args, args, sizeof *n->composite.args * arg_cnt);
- n->composite.min_valid = 0;
- assert (is_valid_node (n));
+ struct expr_node *n = pool_alloc (e->expr_pool, sizeof *n);
+ *n = (struct expr_node) {
+ .type = op,
+ .n_args = n_args,
+ .args = pool_clone (e->expr_pool, args, sizeof *n->args * n_args),
+ };
return n;
}
-union any_node *
+struct expr_node *
expr_allocate_number (struct expression *e, double d)
{
- union any_node *n = pool_alloc (e->expr_pool, sizeof n->number);
- n->type = OP_number;
- n->number.n = d;
+ struct expr_node *n = pool_alloc (e->expr_pool, sizeof *n);
+ *n = (struct expr_node) { .type = OP_number, .number = d };
return n;
}
-union any_node *
+struct expr_node *
expr_allocate_boolean (struct expression *e, double b)
{
- union any_node *n = pool_alloc (e->expr_pool, sizeof n->number);
assert (b == 0.0 || b == 1.0 || b == SYSMIS);
- n->type = OP_boolean;
- n->number.n = b;
+
+ struct expr_node *n = pool_alloc (e->expr_pool, sizeof *n);
+ *n = (struct expr_node) { .type = OP_boolean, .number = b };
return n;
}
-union any_node *
+struct expr_node *
expr_allocate_integer (struct expression *e, int i)
{
- union any_node *n = pool_alloc (e->expr_pool, sizeof n->integer);
- n->type = OP_integer;
- n->integer.i = i;
+ struct expr_node *n = pool_alloc (e->expr_pool, sizeof *n);
+ *n = (struct expr_node) { .type = OP_integer, .integer = i };
return n;
}
-union any_node *
+struct expr_node *
expr_allocate_pos_int (struct expression *e, int i)
{
- union any_node *n = pool_alloc (e->expr_pool, sizeof n->integer);
assert (i > 0);
- n->type = OP_pos_int;
- n->integer.i = i;
+
+ struct expr_node *n = pool_alloc (e->expr_pool, sizeof *n);
+ *n = (struct expr_node) { .type = OP_pos_int, .integer = i };
return n;
}
-union any_node *
+struct expr_node *
expr_allocate_vector (struct expression *e, const struct vector *vector)
{
- union any_node *n = pool_alloc (e->expr_pool, sizeof n->vector);
- n->type = OP_vector;
- n->vector.v = vector;
+ struct expr_node *n = pool_alloc (e->expr_pool, sizeof *n);
+ *n = (struct expr_node) { .type = OP_vector, .vector = vector };
return n;
}
-union any_node *
-expr_allocate_string_buffer (struct expression *e,
- const char *string, size_t length)
+struct expr_node *
+expr_allocate_string (struct expression *e, struct substring s)
{
- union any_node *n = pool_alloc (e->expr_pool, sizeof n->string);
- n->type = OP_string;
- if (length > MAX_STRING)
- length = MAX_STRING;
- n->string.s = copy_string (e, string, length);
+ struct expr_node *n = pool_alloc (e->expr_pool, sizeof *n);
+ *n = (struct expr_node) { .type = OP_string, .string = s };
return n;
}
-union any_node *
-expr_allocate_string (struct expression *e, struct substring s)
+struct expr_node *
+expr_allocate_variable (struct expression *e, const struct variable *v)
{
- union any_node *n = pool_alloc (e->expr_pool, sizeof n->string);
- n->type = OP_string;
- n->string.s = s;
+ struct expr_node *n = pool_alloc (e->expr_pool, sizeof *n);
+ *n = (struct expr_node) {
+ .type = var_is_numeric (v) ? OP_num_var : OP_str_var,
+ .variable = v
+ };
return n;
}
-union any_node *
-expr_allocate_variable (struct expression *e, struct variable *v)
+struct expr_node *
+expr_allocate_format (struct expression *e, const struct fmt_spec *format)
{
- union any_node *n = pool_alloc (e->expr_pool, sizeof n->variable);
- n->type = var_is_numeric (v) ? OP_num_var : OP_str_var;
- n->variable.v = v;
+ struct expr_node *n = pool_alloc (e->expr_pool, sizeof *n);
+ *n = (struct expr_node) { .type = OP_format, .format = *format };
return n;
}
-union any_node *
-expr_allocate_format (struct expression *e, const struct fmt_spec *format)
+struct expr_node *
+expr_allocate_expr_node (struct expression *e,
+ const struct expr_node *expr_node)
{
- union any_node *n = pool_alloc (e->expr_pool, sizeof n->format);
- n->type = OP_format;
- n->format.f = *format;
+ struct expr_node *n = pool_alloc (e->expr_pool, sizeof *n);
+ *n = (struct expr_node) { .type = OP_expr_node, .expr_node = expr_node };
return n;
}
/* Allocates a unary composite node that represents the value of
variable V in expression E. */
-static union any_node *
-allocate_unary_variable (struct expression *e, struct variable *v)
+static struct expr_node *
+allocate_unary_variable (struct expression *e, const struct variable *v)
{
assert (v != NULL);
return expr_allocate_unary (e, var_is_numeric (v) ? OP_NUM_VAR : OP_STR_VAR,
expr_allocate_variable (e, v));
}
+\f
+/* Export function details to other modules. */
+
+/* Returns the operation structure for the function with the
+ given IDX. */
+const struct operation *
+expr_get_function (size_t idx)
+{
+ assert (idx < n_OP_function);
+ return &operations[OP_function_first + idx];
+}
+
+/* Returns the number of expression functions. */
+size_t
+expr_get_n_functions (void)
+{
+ return n_OP_function;
+}
+
+/* Returns the name of operation OP. */
+const char *
+expr_operation_get_name (const struct operation *op)
+{
+ return op->name;
+}
+
+/* Returns the human-readable prototype for operation OP. */
+const char *
+expr_operation_get_prototype (const struct operation *op)
+{
+ return op->prototype;
+}
+
+/* Returns the number of arguments for operation OP. */
+int
+expr_operation_get_n_args (const struct operation *op)
+{
+ return op->n_args;
+}
projects / pspp / blobdiff