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parse.y
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parse.y
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/*
** parse.y - mruby parser
**
** See Copyright Notice in mruby.h
*/
%{
#undef PARSER_DEBUG
#define YYDEBUG 1
#define YYERROR_VERBOSE 1
/*
* Force yacc to use our memory management. This is a little evil because
* the macros assume that "parser_state *p" is in scope
*/
#define YYMALLOC(n) mrb_malloc(p->mrb, (n))
#define YYFREE(o) mrb_free(p->mrb, (o))
#define YYSTACK_USE_ALLOCA 0
#include "mruby.h"
#include "mruby/compile.h"
#include "mruby/proc.h"
#include "node.h"
#include <stdio.h>
#include <errno.h>
#include <ctype.h>
#include <string.h>
#define YYLEX_PARAM p
typedef mrb_ast_node node;
typedef struct mrb_parser_state parser_state;
typedef struct mrb_parser_heredoc_info parser_heredoc_info;
static int yylex(void *lval, parser_state *p);
static void yyerror(parser_state *p, const char *s);
static void yywarn(parser_state *p, const char *s);
static void yywarning(parser_state *p, const char *s);
static void backref_error(parser_state *p, node *n);
#define identchar(c) (isalnum(c) || (c) == '_' || !isascii(c))
typedef unsigned int stack_type;
#define BITSTACK_PUSH(stack, n) ((stack) = ((stack)<<1)|((n)&1))
#define BITSTACK_POP(stack) ((stack) = (stack) >> 1)
#define BITSTACK_LEXPOP(stack) ((stack) = ((stack) >> 1) | ((stack) & 1))
#define BITSTACK_SET_P(stack) ((stack)&1)
#define COND_PUSH(n) BITSTACK_PUSH(p->cond_stack, (n))
#define COND_POP() BITSTACK_POP(p->cond_stack)
#define COND_LEXPOP() BITSTACK_LEXPOP(p->cond_stack)
#define COND_P() BITSTACK_SET_P(p->cond_stack)
#define CMDARG_PUSH(n) BITSTACK_PUSH(p->cmdarg_stack, (n))
#define CMDARG_POP() BITSTACK_POP(p->cmdarg_stack)
#define CMDARG_LEXPOP() BITSTACK_LEXPOP(p->cmdarg_stack)
#define CMDARG_P() BITSTACK_SET_P(p->cmdarg_stack)
#define sym(x) ((mrb_sym)(intptr_t)(x))
#define nsym(x) ((node*)(intptr_t)(x))
static mrb_sym
intern_gen(parser_state *p, const char *s)
{
return mrb_intern(p->mrb, s);
}
#define intern(s) intern_gen(p,(s))
static void
cons_free_gen(parser_state *p, node *cons)
{
cons->cdr = p->cells;
p->cells = cons;
}
#define cons_free(c) cons_free_gen(p, (c))
static void*
parser_palloc(parser_state *p, size_t size)
{
void *m = mrb_pool_alloc(p->pool, size);
if (!m) {
longjmp(p->jmp, 1);
}
return m;
}
static node*
cons_gen(parser_state *p, node *car, node *cdr)
{
node *c;
if (p->cells) {
c = p->cells;
p->cells = p->cells->cdr;
}
else {
c = (node *)parser_palloc(p, sizeof(mrb_ast_node));
}
c->car = car;
c->cdr = cdr;
c->lineno = p->lineno;
return c;
}
#define cons(a,b) cons_gen(p,(a),(b))
static node*
list1_gen(parser_state *p, node *a)
{
return cons(a, 0);
}
#define list1(a) list1_gen(p, (a))
static node*
list2_gen(parser_state *p, node *a, node *b)
{
return cons(a, cons(b,0));
}
#define list2(a,b) list2_gen(p, (a),(b))
static node*
list3_gen(parser_state *p, node *a, node *b, node *c)
{
return cons(a, cons(b, cons(c,0)));
}
#define list3(a,b,c) list3_gen(p, (a),(b),(c))
static node*
list4_gen(parser_state *p, node *a, node *b, node *c, node *d)
{
return cons(a, cons(b, cons(c, cons(d, 0))));
}
#define list4(a,b,c,d) list4_gen(p, (a),(b),(c),(d))
static node*
list5_gen(parser_state *p, node *a, node *b, node *c, node *d, node *e)
{
return cons(a, cons(b, cons(c, cons(d, cons(e, 0)))));
}
#define list5(a,b,c,d,e) list5_gen(p, (a),(b),(c),(d),(e))
static node*
list6_gen(parser_state *p, node *a, node *b, node *c, node *d, node *e, node *f)
{
return cons(a, cons(b, cons(c, cons(d, cons(e, cons(f, 0))))));
}
#define list6(a,b,c,d,e,f) list6_gen(p, (a),(b),(c),(d),(e),(f))
static node*
append_gen(parser_state *p, node *a, node *b)
{
node *c = a;
if (!a) return b;
while (c->cdr) {
c = c->cdr;
}
if (b) {
c->cdr = b;
}
return a;
}
#define append(a,b) append_gen(p,(a),(b))
#define push(a,b) append_gen(p,(a),list1(b))
static char*
parser_strndup(parser_state *p, const char *s, size_t len)
{
char *b = (char *)parser_palloc(p, len+1);
memcpy(b, s, len);
b[len] = '\0';
return b;
}
#define strndup(s,len) parser_strndup(p, s, len)
static char*
parser_strdup(parser_state *p, const char *s)
{
return parser_strndup(p, s, strlen(s));
}
#undef strdup
#define strdup(s) parser_strdup(p, s)
// xxx -----------------------------
static node*
local_switch(parser_state *p)
{
node *prev = p->locals;
p->locals = cons(0, 0);
return prev;
}
static void
local_resume(parser_state *p, node *prev)
{
p->locals = prev;
}
static void
local_nest(parser_state *p)
{
p->locals = cons(0, p->locals);
}
static void
local_unnest(parser_state *p)
{
p->locals = p->locals->cdr;
}
static int
local_var_p(parser_state *p, mrb_sym sym)
{
node *l = p->locals;
while (l) {
node *n = l->car;
while (n) {
if (sym(n->car) == sym) return 1;
n = n->cdr;
}
l = l->cdr;
}
return 0;
}
static void
local_add_f(parser_state *p, mrb_sym sym)
{
p->locals->car = push(p->locals->car, nsym(sym));
}
static void
local_add(parser_state *p, mrb_sym sym)
{
if (!local_var_p(p, sym)) {
local_add_f(p, sym);
}
}
// (:scope (vars..) (prog...))
static node*
new_scope(parser_state *p, node *body)
{
return cons((node*)NODE_SCOPE, cons(p->locals->car, body));
}
// (:begin prog...)
static node*
new_begin(parser_state *p, node *body)
{
if (body)
return list2((node*)NODE_BEGIN, body);
return cons((node*)NODE_BEGIN, 0);
}
#define newline_node(n) (n)
// (:rescue body rescue else)
static node*
new_rescue(parser_state *p, node *body, node *resq, node *els)
{
return list4((node*)NODE_RESCUE, body, resq, els);
}
// (:ensure body ensure)
static node*
new_ensure(parser_state *p, node *a, node *b)
{
return cons((node*)NODE_ENSURE, cons(a, cons(0, b)));
}
// (:nil)
static node*
new_nil(parser_state *p)
{
return list1((node*)NODE_NIL);
}
// (:true)
static node*
new_true(parser_state *p)
{
return list1((node*)NODE_TRUE);
}
// (:false)
static node*
new_false(parser_state *p)
{
return list1((node*)NODE_FALSE);
}
// (:alias new old)
static node*
new_alias(parser_state *p, mrb_sym a, mrb_sym b)
{
return cons((node*)NODE_ALIAS, cons(nsym(a), nsym(b)));
}
// (:if cond then else)
static node*
new_if(parser_state *p, node *a, node *b, node *c)
{
return list4((node*)NODE_IF, a, b, c);
}
// (:unless cond then else)
static node*
new_unless(parser_state *p, node *a, node *b, node *c)
{
return list4((node*)NODE_IF, a, c, b);
}
// (:while cond body)
static node*
new_while(parser_state *p, node *a, node *b)
{
return cons((node*)NODE_WHILE, cons(a, b));
}
// (:until cond body)
static node*
new_until(parser_state *p, node *a, node *b)
{
return cons((node*)NODE_UNTIL, cons(a, b));
}
// (:for var obj body)
static node*
new_for(parser_state *p, node *v, node *o, node *b)
{
return list4((node*)NODE_FOR, v, o, b);
}
// (:case a ((when ...) body) ((when...) body))
static node*
new_case(parser_state *p, node *a, node *b)
{
node *n = list2((node*)NODE_CASE, a);
node *n2 = n;
while (n2->cdr) {
n2 = n2->cdr;
}
n2->cdr = b;
return n;
}
// (:postexe a)
static node*
new_postexe(parser_state *p, node *a)
{
return cons((node*)NODE_POSTEXE, a);
}
// (:self)
static node*
new_self(parser_state *p)
{
return list1((node*)NODE_SELF);
}
// (:call a b c)
static node*
new_call(parser_state *p, node *a, mrb_sym b, node *c)
{
return list4((node*)NODE_CALL, a, nsym(b), c);
}
// (:fcall self mid args)
static node*
new_fcall(parser_state *p, mrb_sym b, node *c)
{
return list4((node*)NODE_FCALL, new_self(p), nsym(b), c);
}
#if 0
// (:vcall self mid)
static node*
new_vcall(parser_state *p, mrb_sym b)
{
return list3((node*)NODE_VCALL, new_self(p), (node*)b);
}
#endif
// (:super . c)
static node*
new_super(parser_state *p, node *c)
{
return cons((node*)NODE_SUPER, c);
}
// (:zsuper)
static node*
new_zsuper(parser_state *p)
{
return list1((node*)NODE_ZSUPER);
}
// (:yield . c)
static node*
new_yield(parser_state *p, node *c)
{
if (c) {
if (c->cdr) {
yyerror(p, "both block arg and actual block given");
}
return cons((node*)NODE_YIELD, c->car);
}
return cons((node*)NODE_YIELD, 0);
}
// (:return . c)
static node*
new_return(parser_state *p, node *c)
{
return cons((node*)NODE_RETURN, c);
}
// (:break . c)
static node*
new_break(parser_state *p, node *c)
{
return cons((node*)NODE_BREAK, c);
}
// (:next . c)
static node*
new_next(parser_state *p, node *c)
{
return cons((node*)NODE_NEXT, c);
}
// (:redo)
static node*
new_redo(parser_state *p)
{
return list1((node*)NODE_REDO);
}
// (:retry)
static node*
new_retry(parser_state *p)
{
return list1((node*)NODE_RETRY);
}
// (:dot2 a b)
static node*
new_dot2(parser_state *p, node *a, node *b)
{
return cons((node*)NODE_DOT2, cons(a, b));
}
// (:dot3 a b)
static node*
new_dot3(parser_state *p, node *a, node *b)
{
return cons((node*)NODE_DOT3, cons(a, b));
}
// (:colon2 b c)
static node*
new_colon2(parser_state *p, node *b, mrb_sym c)
{
return cons((node*)NODE_COLON2, cons(b, nsym(c)));
}
// (:colon3 . c)
static node*
new_colon3(parser_state *p, mrb_sym c)
{
return cons((node*)NODE_COLON3, nsym(c));
}
// (:and a b)
static node*
new_and(parser_state *p, node *a, node *b)
{
return cons((node*)NODE_AND, cons(a, b));
}
// (:or a b)
static node*
new_or(parser_state *p, node *a, node *b)
{
return cons((node*)NODE_OR, cons(a, b));
}
// (:array a...)
static node*
new_array(parser_state *p, node *a)
{
return cons((node*)NODE_ARRAY, a);
}
// (:splat . a)
static node*
new_splat(parser_state *p, node *a)
{
return cons((node*)NODE_SPLAT, a);
}
// (:hash (k . v) (k . v)...)
static node*
new_hash(parser_state *p, node *a)
{
return cons((node*)NODE_HASH, a);
}
// (:sym . a)
static node*
new_sym(parser_state *p, mrb_sym sym)
{
return cons((node*)NODE_SYM, nsym(sym));
}
static mrb_sym
new_strsym(parser_state *p, node* str)
{
const char *s = (const char*)str->cdr->car;
size_t len = (size_t)str->cdr->cdr;
return mrb_intern2(p->mrb, s, len);
}
// (:lvar . a)
static node*
new_lvar(parser_state *p, mrb_sym sym)
{
return cons((node*)NODE_LVAR, nsym(sym));
}
// (:gvar . a)
static node*
new_gvar(parser_state *p, mrb_sym sym)
{
return cons((node*)NODE_GVAR, nsym(sym));
}
// (:ivar . a)
static node*
new_ivar(parser_state *p, mrb_sym sym)
{
return cons((node*)NODE_IVAR, nsym(sym));
}
// (:cvar . a)
static node*
new_cvar(parser_state *p, mrb_sym sym)
{
return cons((node*)NODE_CVAR, nsym(sym));
}
// (:const . a)
static node*
new_const(parser_state *p, mrb_sym sym)
{
return cons((node*)NODE_CONST, nsym(sym));
}
// (:undef a...)
static node*
new_undef(parser_state *p, mrb_sym sym)
{
return list2((node*)NODE_UNDEF, nsym(sym));
}
// (:class class super body)
static node*
new_class(parser_state *p, node *c, node *s, node *b)
{
return list4((node*)NODE_CLASS, c, s, cons(p->locals->car, b));
}
// (:sclass obj body)
static node*
new_sclass(parser_state *p, node *o, node *b)
{
return list3((node*)NODE_SCLASS, o, cons(p->locals->car, b));
}
// (:module module body)
static node*
new_module(parser_state *p, node *m, node *b)
{
return list3((node*)NODE_MODULE, m, cons(p->locals->car, b));
}
// (:def m lv (arg . body))
static node*
new_def(parser_state *p, mrb_sym m, node *a, node *b)
{
return list5((node*)NODE_DEF, nsym(m), p->locals->car, a, b);
}
// (:sdef obj m lv (arg . body))
static node*
new_sdef(parser_state *p, node *o, mrb_sym m, node *a, node *b)
{
return list6((node*)NODE_SDEF, o, nsym(m), p->locals->car, a, b);
}
// (:arg . sym)
static node*
new_arg(parser_state *p, mrb_sym sym)
{
return cons((node*)NODE_ARG, nsym(sym));
}
// (m o r m2 b)
// m: (a b c)
// o: ((a . e1) (b . e2))
// r: a
// m2: (a b c)
// b: a
static node*
new_args(parser_state *p, node *m, node *opt, mrb_sym rest, node *m2, mrb_sym blk)
{
node *n;
n = cons(m2, nsym(blk));
n = cons(nsym(rest), n);
n = cons(opt, n);
return cons(m, n);
}
// (:block_arg . a)
static node*
new_block_arg(parser_state *p, node *a)
{
return cons((node*)NODE_BLOCK_ARG, a);
}
// (:block arg body)
static node*
new_block(parser_state *p, node *a, node *b)
{
return list4((node*)NODE_BLOCK, p->locals->car, a, b);
}
// (:lambda arg body)
static node*
new_lambda(parser_state *p, node *a, node *b)
{
return list4((node*)NODE_LAMBDA, p->locals->car, a, b);
}
// (:asgn lhs rhs)
static node*
new_asgn(parser_state *p, node *a, node *b)
{
return cons((node*)NODE_ASGN, cons(a, b));
}
// (:masgn mlhs=(pre rest post) mrhs)
static node*
new_masgn(parser_state *p, node *a, node *b)
{
return cons((node*)NODE_MASGN, cons(a, b));
}
// (:asgn lhs rhs)
static node*
new_op_asgn(parser_state *p, node *a, mrb_sym op, node *b)
{
return list4((node*)NODE_OP_ASGN, a, nsym(op), b);
}
// (:int . i)
static node*
new_int(parser_state *p, const char *s, int base)
{
return list3((node*)NODE_INT, (node*)strdup(s), (node*)(intptr_t)base);
}
// (:float . i)
static node*
new_float(parser_state *p, const char *s)
{
return cons((node*)NODE_FLOAT, (node*)strdup(s));
}
// (:str . (s . len))
static node*
new_str(parser_state *p, const char *s, int len)
{
return cons((node*)NODE_STR, cons((node*)strndup(s, len), (node*)(intptr_t)len));
}
// (:dstr . a)
static node*
new_dstr(parser_state *p, node *a)
{
return cons((node*)NODE_DSTR, a);
}
// (:dsym . a)
static node*
new_dsym(parser_state *p, node *a)
{
return cons((node*)NODE_DSYM, new_dstr(p, a));
}
// (:str . (a . a))
static node*
new_regx(parser_state *p, const char *p1, const char* p2)
{
return cons((node*)NODE_REGX, cons((node*)p1, (node*)p2));
}
// (:dregx . a)
static node*
new_dregx(parser_state *p, node *a, node *b)
{
return cons((node*)NODE_DREGX, cons(a, b));
}
// (:backref . n)
static node*
new_back_ref(parser_state *p, int n)
{
return cons((node*)NODE_BACK_REF, (node*)(intptr_t)n);
}
// (:nthref . n)
static node*
new_nth_ref(parser_state *p, int n)
{
return cons((node*)NODE_NTH_REF, (node*)(intptr_t)n);
}
// (:heredoc . a)
static node*
new_heredoc(parser_state *p)
{
parser_heredoc_info *inf = parser_palloc(p, sizeof(parser_heredoc_info));
return cons((node*)NODE_HEREDOC, (node*)inf);
}
static void
new_bv(parser_state *p, mrb_sym id)
{
}
// xxx -----------------------------
// (:call a op)
static node*
call_uni_op(parser_state *p, node *recv, char *m)
{
return new_call(p, recv, intern(m), 0);
}
// (:call a op b)
static node*
call_bin_op(parser_state *p, node *recv, char *m, node *arg1)
{
return new_call(p, recv, intern(m), list1(list1(arg1)));
}
/*
// (:match (a . b))
static node*
match_op(parser_state *p, node *a, node *b)
{
return cons((node*)NODE_MATCH, cons((node*)a, (node*)b));
}
*/
static void
args_with_block(parser_state *p, node *a, node *b)
{
if (b) {
if (a->cdr) {
yyerror(p, "both block arg and actual block given");
}
a->cdr = b;
}
}
static void
call_with_block(parser_state *p, node *a, node *b)
{
node *n;
if (a->car == (node*)NODE_SUPER ||
a->car == (node*)NODE_ZSUPER) {
if (!a->cdr) a->cdr = cons(0, b);
else {
args_with_block(p, a->cdr, b);
}
}
else {
n = a->cdr->cdr->cdr;
if (!n->car) n->car = cons(0, b);
else {
args_with_block(p, n->car, b);
}
}
}
static node*
negate_lit(parser_state *p, node *n)
{
return cons((node*)NODE_NEGATE, n);
}
static node*
cond(node *n)
{
return n;
}
static node*
ret_args(parser_state *p, node *n)
{
if (n->cdr) {
yyerror(p, "block argument should not be given");
}
if (!n->car->cdr) return n->car->car;
return new_array(p, n->car);
}
static void
assignable(parser_state *p, node *lhs)
{
if ((int)(intptr_t)lhs->car == NODE_LVAR) {
local_add(p, sym(lhs->cdr));
}
}
static node*
var_reference(parser_state *p, node *lhs)
{
node *n;
if ((int)(intptr_t)lhs->car == NODE_LVAR) {
if (!local_var_p(p, sym(lhs->cdr))) {
n = new_fcall(p, sym(lhs->cdr), 0);
cons_free(lhs);
return n;
}
}
return lhs;
}
static node*
heredoc_start_sb(parser_state *p, const char* term, size_t term_len, enum heredoc_type type, int allow_indent)
{
node *newnode = new_heredoc(p);
parser_heredoc_info *inf = (parser_heredoc_info*)newnode->cdr;
inf->term = term;
inf->term_len = term_len;
inf->type = type;
inf->allow_indent = allow_indent;
inf->line_head = TRUE;
inf->doc = NULL;
p->heredocs = push(p->heredocs, newnode);
if (p->parsing_heredoc == NULL) {
node *c = p->heredocs;
while (c->cdr)
c = c->cdr;
p->parsing_heredoc = c;
}
p->heredoc_starts_nextline = TRUE;
p->lstate = EXPR_END;
return newnode;
}
static node*
heredoc_start(parser_state *p, node *beg, node *str, enum heredoc_type type)
{
char *bs = (char*)beg->cdr->car;
int allow_indent = (bs[2] == '-');
const char *s = (char*)str->cdr->car;
size_t len = (intptr_t)str->cdr->cdr;
return heredoc_start_sb(p, s, len, type, allow_indent);
}
static node*
heredoc_start_sym(parser_state *p, node *beg, mrb_sym sym, enum heredoc_type type)
{
char *bs = (char*)beg->cdr->car;
int allow_indent = (bs[2] == '-');
int len;
const char *s = mrb_sym2name_len(p->mrb, sym, &len);
return heredoc_start_sb(p, s, len, type, allow_indent);
}
parser_heredoc_info *
parsing_heredoc_inf(parser_state *p)
{
node *nd = p->parsing_heredoc;
if (nd == NULL)
return NULL;
/* assert(nd->car->car == NODE_HEREDOC); */
return (parser_heredoc_info*)nd->car->cdr;
}
static void
heredoc_end(parser_state *p)
{
p->parsing_heredoc = p->parsing_heredoc->cdr;
if (p->parsing_heredoc == NULL) {
p->lstate = EXPR_BEG;
p->cmd_start = TRUE;
p->sterm = 0;
p->heredoc_end_now = TRUE;
} else {
p->sterm = ' '; /* next heredoc */
}
}
// xxx -----------------------------
%}
%expect 2
%pure_parser
%parse-param {parser_state *p}
%lex-param {parser_state *p}
%union {
node *nd;
mrb_sym id;
int num;
unsigned int stack;
const struct vtable *vars;
}
%token
keyword_class
keyword_module
keyword_def
keyword_undef
keyword_begin
keyword_rescue
keyword_ensure
keyword_end
keyword_if
keyword_unless
keyword_then
keyword_elsif
keyword_else
keyword_case
keyword_when
keyword_while
keyword_until
keyword_for
keyword_break
keyword_next
keyword_redo
keyword_retry
keyword_in
keyword_do
keyword_do_cond
keyword_do_block
keyword_do_LAMBDA
keyword_return
keyword_yield
keyword_super
keyword_self
keyword_nil
keyword_true
keyword_false
keyword_and
keyword_or
keyword_not
modifier_if
modifier_unless
modifier_while
modifier_until
modifier_rescue
keyword_alias
keyword_BEGIN
keyword_END
keyword__LINE__
keyword__FILE__
keyword__ENCODING__
%token <id> tIDENTIFIER tFID tGVAR tIVAR tCONSTANT tCVAR tLABEL
%token <nd> tINTEGER tFLOAT tCHAR tREGEXP
%token <nd> tSTRING tSTRING_PART
%token <nd> tNTH_REF tBACK_REF
%token <num> tREGEXP_END
%type <nd> singleton string string_interp regexp
%type <nd> literal numeric cpath symbol
%type <nd> top_compstmt top_stmts top_stmt