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/*
* Copyright (c) 2015 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <vlib/vlib.h>
#include <vlib/lex.h>
vlib_lex_main_t vlib_lex_main;
#define LEX_DEBUG 0
u8 *
format_vlib_lex_token (u8 * s, va_list * args)
{
vlib_lex_main_t *lm = va_arg (*args, vlib_lex_main_t *);
vlib_lex_token_t *t = va_arg (*args, vlib_lex_token_t *);
if (t->token == VLIB_LEX_word)
s = format (s, "%s", t->value.as_pointer);
else
s = format (s, "%s", lm->lex_token_names[t->token]);
return s;
}
void
vlib_lex_get_token (vlib_lex_main_t * lm, vlib_lex_token_t * rv)
{
u8 c;
vlib_lex_table_t *t;
vlib_lex_table_entry_t *e;
uword tv;
if (PREDICT_FALSE (lm->pushback_sp >= 0))
{
rv[0] = lm->pushback_vector[lm->pushback_sp--];
return;
}
rv->value.as_uword = ~0;
while (1)
{
if (PREDICT_FALSE (lm->current_index >= vec_len (lm->input_vector)))
{
rv->token = VLIB_LEX_eof;
return;
}
t = vec_elt_at_index (lm->lex_tables, lm->current_table_index);
c = (lm->input_vector[lm->current_index++]) & 0x7f;
e = &t->entries[c];
lm->current_table_index = e->next_table_index;
switch (e->action)
{
case VLIB_LEX_IGNORE:
continue;
case VLIB_LEX_START_NUMBER:
lm->current_token_value = 0;
/* fallthru */
case VLIB_LEX_ADD_TO_NUMBER:
lm->current_number_base = e->token;
lm->current_token_value *= lm->current_number_base;
tv = c - '0';
if (tv >= lm->current_number_base)
{
tv = 10 + c - 'A';
if (tv >= lm->current_number_base)
tv = 10 + c - 'a';
}
lm->current_token_value += tv;
continue;
case VLIB_LEX_ADD_TO_TOKEN:
vec_add1 (lm->token_buffer, c);
continue;
case VLIB_LEX_KEYWORD_CHECK:
{
uword *p;
vec_add1 (lm->token_buffer, 0);
/* It's either a keyword or just a word. */
p = hash_get_mem (lm->lex_keywords, lm->token_buffer);
if (p)
{
rv->token = p[0];
if (LEX_DEBUG > 0)
clib_warning ("keyword '%s' token %s",
lm->token_buffer,
lm->lex_token_names[rv->token]);
}
else
{
/* it's a WORD */
rv->token = VLIB_LEX_word;
rv->value.as_pointer = vec_dup (lm->token_buffer);
if (LEX_DEBUG > 0)
clib_warning ("%s, value '%s'",
lm->lex_token_names[VLIB_LEX_word],
rv->value.as_pointer);
}
_vec_len (lm->token_buffer) = 0;
/* Rescan the character which terminated the keyword/word. */
lm->current_index--;
return;
}
case VLIB_LEX_RETURN_AND_RESCAN:
ASSERT (lm->current_index);
lm->current_index--;
/* note flow-through */
case VLIB_LEX_RETURN:
rv->token = e->token;
rv->value.as_uword = lm->current_token_value;
lm->current_token_value = ~0;
if (LEX_DEBUG > 0)
{
clib_warning
("table %s char '%c'(0x%02x) next table %s return %s",
t->name, c, c, lm->lex_tables[e->next_table_index].name,
lm->lex_token_names[e->token]);
if (rv->token == VLIB_LEX_number)
clib_warning (" numeric value 0x%x (%d)", rv->value,
rv->value);
}
return;
}
}
}
u16
vlib_lex_add_token (vlib_lex_main_t * lm, char *token_name)
{
uword *p;
u16 rv;
p = hash_get_mem (lm->lex_tokens_by_name, token_name);
if (p)
return p[0];
rv = vec_len (lm->lex_token_names);
hash_set_mem (lm->lex_tokens_by_name, token_name, rv);
vec_add1 (lm->lex_token_names, token_name);
return rv;
}
static u16
add_keyword (vlib_lex_main_t * lm, char *keyword, char *token_name)
{
uword *p;
u16 token;
p = hash_get_mem (lm->lex_keywords, keyword);
ASSERT (p == 0);
token = vlib_lex_add_token (lm, token_name);
hash_set_mem (lm->lex_keywords, keyword, token);
return token;
}
u16
vlib_lex_find_or_add_keyword (vlib_lex_main_t * lm, char *keyword,
char *token_name)
{
uword *p = hash_get_mem (lm->lex_keywords, keyword);
return p ? p[0] : add_keyword (lm, keyword, token_name);
}
void
vlib_lex_set_action_range (u32 table_index, u8 lo, u8 hi, u16 action,
u16 token, u32 next_table_index)
{
int i;
vlib_lex_main_t *lm = &vlib_lex_main;
vlib_lex_table_t *t = pool_elt_at_index (lm->lex_tables, table_index);
for (i = lo; i <= hi; i++)
{
ASSERT (i < ARRAY_LEN (t->entries));
t->entries[i].action = action;
t->entries[i].token = token;
t->entries[i].next_table_index = next_table_index;
}
}
u16
vlib_lex_add_table (char *name)
{
vlib_lex_main_t *lm = &vlib_lex_main;
vlib_lex_table_t *t;
uword *p;
p = hash_get_mem (lm->lex_tables_by_name, name);
ASSERT (p == 0);
pool_get_aligned (lm->lex_tables, t, CLIB_CACHE_LINE_BYTES);
t->name = name;
hash_set_mem (lm->lex_tables_by_name, name, t - lm->lex_tables);
vlib_lex_set_action_range (t - lm->lex_tables, 1, 0x7F, VLIB_LEX_IGNORE, ~0,
t - lm->lex_tables);
vlib_lex_set_action_range (t - lm->lex_tables, 0, 0, VLIB_LEX_RETURN,
VLIB_LEX_eof, t - lm->lex_tables);
return t - lm->lex_tables;
}
void
vlib_lex_reset (vlib_lex_main_t * lm, u8 * input_vector)
{
if (lm->pushback_vector)
_vec_len (lm->pushback_vector) = 0;
lm->pushback_sp = -1;
lm->input_vector = input_vector;
lm->current_index = 0;
}
static clib_error_t *
lex_onetime_init (vlib_main_t * vm)
{
vlib_lex_main_t *lm = &vlib_lex_main;
lm->lex_tables_by_name = hash_create_string (0, sizeof (uword));
lm->lex_tokens_by_name = hash_create_string (0, sizeof (uword));
lm->lex_keywords = hash_create_string (0, sizeof (uword));
lm->pushback_sp = -1;
#define _(f) { u16 tmp = vlib_lex_add_token (lm, #f); ASSERT (tmp == VLIB_LEX_##f); }
foreach_vlib_lex_global_token;
#undef _
vec_validate (lm->token_buffer, 127);
_vec_len (lm->token_buffer) = 0;
return 0;
}
VLIB_INIT_FUNCTION (lex_onetime_init);
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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