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py/parse: Remove rule_t struct because it's no longer needed.

pull/1/head
Damien George 2017-12-24 00:01:02 +11:00
parent 66d8885d85
commit c2c92ceefc
1 changed files with 36 additions and 43 deletions
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79
py/parse.c
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@ -58,12 +58,6 @@
// (un)comment to use rule names; for debugging
//#define USE_RULE_NAME (1)
typedef struct _rule_t {
byte rule_id;
byte act;
const uint16_t *arg;
} rule_t;
enum {
// define rules with a compile function
#define DEF_RULE(rule, comp, kind, ...) RULE_##rule,
@ -254,13 +248,12 @@ STATIC void push_rule_from_arg(parser_t *parser, size_t arg) {
push_rule(parser, parser->lexer->tok_line, rule_id, 0);
}
STATIC void pop_rule(parser_t *parser, rule_t *rule, size_t *arg_i, size_t *src_line) {
STATIC uint8_t pop_rule(parser_t *parser, size_t *arg_i, size_t *src_line) {
parser->rule_stack_top -= 1;
rule->rule_id = parser->rule_stack[parser->rule_stack_top].rule_id;
rule->act = rule_act_table[rule->rule_id];
rule->arg = rule_arg_table[rule->rule_id];
uint8_t rule_id = parser->rule_stack[parser->rule_stack_top].rule_id;
*arg_i = parser->rule_stack[parser->rule_stack_top].arg_i;
*src_line = parser->rule_stack[parser->rule_stack_top].src_line;
return rule_id;
}
bool mp_parse_node_is_const_false(mp_parse_node_t pn) {
@ -810,10 +803,7 @@ mp_parse_tree_t mp_parse(mp_lexer_t *lex, mp_parse_input_kind_t input_kind) {
// parse!
size_t n, i; // state for the current rule
size_t rule_src_line; // source line for the first token matched by the current rule
bool backtrack = false;
const rule_t *rule = NULL;
for (;;) {
next_rule:
@ -821,10 +811,13 @@ mp_parse_tree_t mp_parse(mp_lexer_t *lex, mp_parse_input_kind_t input_kind) {
break;
}
rule_t rule_data;
pop_rule(&parser, &rule_data, &i, &rule_src_line);
rule = &rule_data;
n = rule->act & RULE_ACT_ARG_MASK;
// Pop the next rule to process it
size_t i; // state for the current rule
size_t rule_src_line; // source line for the first token matched by the current rule
uint8_t rule_id = pop_rule(&parser, &i, &rule_src_line);
uint8_t rule_act = rule_act_table[rule_id];
const uint16_t *rule_arg = rule_arg_table[rule_id];
size_t n = rule_act & RULE_ACT_ARG_MASK;
/*
// debugging
@ -832,10 +825,10 @@ mp_parse_tree_t mp_parse(mp_lexer_t *lex, mp_parse_input_kind_t input_kind) {
for (int j = 0; j < parser.rule_stack_top; ++j) {
printf(" ");
}
printf("%s n=%d i=%d bt=%d\n", rule_name_table[rule->rule_id], n, i, backtrack);
printf("%s n=%d i=%d bt=%d\n", rule_name_table[rule_id], n, i, backtrack);
*/
switch (rule->act & RULE_ACT_KIND_MASK) {
switch (rule_act & RULE_ACT_KIND_MASK) {
case RULE_ACT_OR:
if (i > 0 && !backtrack) {
goto next_rule;
@ -843,19 +836,19 @@ mp_parse_tree_t mp_parse(mp_lexer_t *lex, mp_parse_input_kind_t input_kind) {
backtrack = false;
}
for (; i < n; ++i) {
uint16_t kind = rule->arg[i] & RULE_ARG_KIND_MASK;
uint16_t kind = rule_arg[i] & RULE_ARG_KIND_MASK;
if (kind == RULE_ARG_TOK) {
if (lex->tok_kind == (rule->arg[i] & RULE_ARG_ARG_MASK)) {
push_result_token(&parser, rule->rule_id);
if (lex->tok_kind == (rule_arg[i] & RULE_ARG_ARG_MASK)) {
push_result_token(&parser, rule_id);
mp_lexer_to_next(lex);
goto next_rule;
}
} else {
assert(kind == RULE_ARG_RULE);
if (i + 1 < n) {
push_rule(&parser, rule_src_line, rule->rule_id, i + 1); // save this or-rule
push_rule(&parser, rule_src_line, rule_id, i + 1); // save this or-rule
}
push_rule_from_arg(&parser, rule->arg[i]); // push child of or-rule
push_rule_from_arg(&parser, rule_arg[i]); // push child of or-rule
goto next_rule;
}
}
@ -867,7 +860,7 @@ mp_parse_tree_t mp_parse(mp_lexer_t *lex, mp_parse_input_kind_t input_kind) {
// failed, backtrack if we can, else syntax error
if (backtrack) {
assert(i > 0);
if ((rule->arg[i - 1] & RULE_ARG_KIND_MASK) == RULE_ARG_OPT_RULE) {
if ((rule_arg[i - 1] & RULE_ARG_KIND_MASK) == RULE_ARG_OPT_RULE) {
// an optional rule that failed, so continue with next arg
push_result_node(&parser, MP_PARSE_NODE_NULL);
backtrack = false;
@ -884,13 +877,13 @@ mp_parse_tree_t mp_parse(mp_lexer_t *lex, mp_parse_input_kind_t input_kind) {
// progress through the rule
for (; i < n; ++i) {
if ((rule->arg[i] & RULE_ARG_KIND_MASK) == RULE_ARG_TOK) {
if ((rule_arg[i] & RULE_ARG_KIND_MASK) == RULE_ARG_TOK) {
// need to match a token
mp_token_kind_t tok_kind = rule->arg[i] & RULE_ARG_ARG_MASK;
mp_token_kind_t tok_kind = rule_arg[i] & RULE_ARG_ARG_MASK;
if (lex->tok_kind == tok_kind) {
// matched token
if (tok_kind == MP_TOKEN_NAME) {
push_result_token(&parser, rule->rule_id);
push_result_token(&parser, rule_id);
}
mp_lexer_to_next(lex);
} else {
@ -905,8 +898,8 @@ mp_parse_tree_t mp_parse(mp_lexer_t *lex, mp_parse_input_kind_t input_kind) {
}
}
} else {
push_rule(&parser, rule_src_line, rule->rule_id, i + 1); // save this and-rule
push_rule_from_arg(&parser, rule->arg[i]); // push child of and-rule
push_rule(&parser, rule_src_line, rule_id, i + 1); // save this and-rule
push_rule_from_arg(&parser, rule_arg[i]); // push child of and-rule
goto next_rule;
}
}
@ -917,7 +910,7 @@ mp_parse_tree_t mp_parse(mp_lexer_t *lex, mp_parse_input_kind_t input_kind) {
#if !MICROPY_ENABLE_DOC_STRING
// this code discards lonely statements, such as doc strings
if (input_kind != MP_PARSE_SINGLE_INPUT && rule->rule_id == RULE_expr_stmt && peek_result(&parser, 0) == MP_PARSE_NODE_NULL) {
if (input_kind != MP_PARSE_SINGLE_INPUT && rule_id == RULE_expr_stmt && peek_result(&parser, 0) == MP_PARSE_NODE_NULL) {
mp_parse_node_t p = peek_result(&parser, 1);
if ((MP_PARSE_NODE_IS_LEAF(p) && !MP_PARSE_NODE_IS_ID(p))
|| MP_PARSE_NODE_IS_STRUCT_KIND(p, RULE_const_object)) {
@ -937,8 +930,8 @@ mp_parse_tree_t mp_parse(mp_lexer_t *lex, mp_parse_input_kind_t input_kind) {
size_t num_not_nil = 0;
for (size_t x = n; x > 0;) {
--x;
if ((rule->arg[x] & RULE_ARG_KIND_MASK) == RULE_ARG_TOK) {
mp_token_kind_t tok_kind = rule->arg[x] & RULE_ARG_ARG_MASK;
if ((rule_arg[x] & RULE_ARG_KIND_MASK) == RULE_ARG_TOK) {
mp_token_kind_t tok_kind = rule_arg[x] & RULE_ARG_ARG_MASK;
if (tok_kind == MP_TOKEN_NAME) {
// only tokens which were names are pushed to stack
i += 1;
@ -953,7 +946,7 @@ mp_parse_tree_t mp_parse(mp_lexer_t *lex, mp_parse_input_kind_t input_kind) {
}
}
if (num_not_nil == 1 && (rule->act & RULE_ACT_ALLOW_IDENT)) {
if (num_not_nil == 1 && (rule_act & RULE_ACT_ALLOW_IDENT)) {
// this rule has only 1 argument and should not be emitted
mp_parse_node_t pn = MP_PARSE_NODE_NULL;
for (size_t x = 0; x < i; ++x) {
@ -966,19 +959,19 @@ mp_parse_tree_t mp_parse(mp_lexer_t *lex, mp_parse_input_kind_t input_kind) {
} else {
// this rule must be emitted
if (rule->act & RULE_ACT_ADD_BLANK) {
if (rule_act & RULE_ACT_ADD_BLANK) {
// and add an extra blank node at the end (used by the compiler to store data)
push_result_node(&parser, MP_PARSE_NODE_NULL);
i += 1;
}
push_result_rule(&parser, rule_src_line, rule->rule_id, i);
push_result_rule(&parser, rule_src_line, rule_id, i);
}
break;
}
default: {
assert((rule->act & RULE_ACT_KIND_MASK) == RULE_ACT_LIST);
assert((rule_act & RULE_ACT_KIND_MASK) == RULE_ACT_LIST);
// n=2 is: item item*
// n=1 is: item (sep item)*
@ -1016,13 +1009,13 @@ mp_parse_tree_t mp_parse(mp_lexer_t *lex, mp_parse_input_kind_t input_kind) {
}
} else {
for (;;) {
size_t arg = rule->arg[i & 1 & n];
size_t arg = rule_arg[i & 1 & n];
if ((arg & RULE_ARG_KIND_MASK) == RULE_ARG_TOK) {
if (lex->tok_kind == (arg & RULE_ARG_ARG_MASK)) {
if (i & 1 & n) {
// separators which are tokens are not pushed to result stack
} else {
push_result_token(&parser, rule->rule_id);
push_result_token(&parser, rule_id);
}
mp_lexer_to_next(lex);
// got element of list, so continue parsing list
@ -1035,7 +1028,7 @@ mp_parse_tree_t mp_parse(mp_lexer_t *lex, mp_parse_input_kind_t input_kind) {
}
} else {
assert((arg & RULE_ARG_KIND_MASK) == RULE_ARG_RULE);
push_rule(&parser, rule_src_line, rule->rule_id, i + 1); // save this list-rule
push_rule(&parser, rule_src_line, rule_id, i + 1); // save this list-rule
push_rule_from_arg(&parser, arg); // push child of list-rule
goto next_rule;
}
@ -1045,7 +1038,7 @@ mp_parse_tree_t mp_parse(mp_lexer_t *lex, mp_parse_input_kind_t input_kind) {
// compute number of elements in list, result in i
i -= 1;
if ((n & 1) && (rule->arg[1] & RULE_ARG_KIND_MASK) == RULE_ARG_TOK) {
if ((n & 1) && (rule_arg[1] & RULE_ARG_KIND_MASK) == RULE_ARG_TOK) {
// don't count separators when they are tokens
i = (i + 1) / 2;
}
@ -1054,12 +1047,12 @@ mp_parse_tree_t mp_parse(mp_lexer_t *lex, mp_parse_input_kind_t input_kind) {
// list matched single item
if (had_trailing_sep) {
// if there was a trailing separator, make a list of a single item
push_result_rule(&parser, rule_src_line, rule->rule_id, i);
push_result_rule(&parser, rule_src_line, rule_id, i);
} else {
// just leave single item on stack (ie don't wrap in a list)
}
} else {
push_result_rule(&parser, rule_src_line, rule->rule_id, i);
push_result_rule(&parser, rule_src_line, rule_id, i);
}
break;
}