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node.c
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/**********************************************************************
node.c - ruby node tree
$Author: mame $
created at: 09/12/06 21:23:44 JST
Copyright (C) 2009 Yusuke Endoh
**********************************************************************/
#include "internal.h"
#include "internal/hash.h"
#include "internal/variable.h"
#include "ruby/ruby.h"
#include "vm_core.h"
#define NODE_BUF_DEFAULT_LEN 16
#define A(str) rb_str_cat2(buf, (str))
#define AR(str) rb_str_concat(buf, (str))
#define A_INDENT add_indent(buf, indent)
#define D_INDENT rb_str_cat2(indent, next_indent)
#define D_DEDENT rb_str_resize(indent, RSTRING_LEN(indent) - 4)
#define A_ID(id) add_id(buf, (id))
#define A_INT(val) rb_str_catf(buf, "%d", (val))
#define A_LONG(val) rb_str_catf(buf, "%ld", (val))
#define A_LIT(lit) AR(rb_dump_literal(lit))
#define A_NODE_HEADER(node, term) \
rb_str_catf(buf, "@ %s (id: %d, line: %d, location: (%d,%d)-(%d,%d))%s"term, \
ruby_node_name(nd_type(node)), nd_node_id(node), nd_line(node), \
nd_first_lineno(node), nd_first_column(node), \
nd_last_lineno(node), nd_last_column(node), \
(node->flags & NODE_FL_NEWLINE ? "*" : ""))
#define A_FIELD_HEADER(len, name, term) \
rb_str_catf(buf, "+- %.*s:"term, (len), (name))
#define D_FIELD_HEADER(len, name, term) (A_INDENT, A_FIELD_HEADER(len, name, term))
#define D_NULL_NODE (A_INDENT, A("(null node)\n"))
#define D_NODE_HEADER(node) (A_INDENT, A_NODE_HEADER(node, "\n"))
#define COMPOUND_FIELD(len, name) \
FIELD_BLOCK((D_FIELD_HEADER((len), (name), "\n"), D_INDENT), D_DEDENT)
#define COMPOUND_FIELD1(name, ann) \
COMPOUND_FIELD(FIELD_NAME_LEN(name, ann), \
FIELD_NAME_DESC(name, ann))
#define FIELD_NAME_DESC(name, ann) name " (" ann ")"
#define FIELD_NAME_LEN(name, ann) (int)( \
comment ? \
rb_strlen_lit(FIELD_NAME_DESC(name, ann)) : \
rb_strlen_lit(name))
#define SIMPLE_FIELD(len, name) \
FIELD_BLOCK(D_FIELD_HEADER((len), (name), " "), A("\n"))
#define FIELD_BLOCK(init, reset) \
for (init, field_flag = 1; \
field_flag; /* should be optimized away */ \
reset, field_flag = 0)
#define SIMPLE_FIELD1(name, ann) SIMPLE_FIELD(FIELD_NAME_LEN(name, ann), FIELD_NAME_DESC(name, ann))
#define F_CUSTOM1(name, ann) SIMPLE_FIELD1(#name, ann)
#define F_ID(name, ann) SIMPLE_FIELD1(#name, ann) A_ID(node->name)
#define F_GENTRY(name, ann) SIMPLE_FIELD1(#name, ann) A_ID(node->name)
#define F_INT(name, ann) SIMPLE_FIELD1(#name, ann) A_INT(node->name)
#define F_LONG(name, ann) SIMPLE_FIELD1(#name, ann) A_LONG(node->name)
#define F_LIT(name, ann) SIMPLE_FIELD1(#name, ann) A_LIT(node->name)
#define F_MSG(name, ann, desc) SIMPLE_FIELD1(#name, ann) A(desc)
#define F_NODE(name, ann) \
COMPOUND_FIELD1(#name, ann) {dump_node(buf, indent, comment, node->name);}
#define ANN(ann) \
if (comment) { \
A_INDENT; A("| # " ann "\n"); \
}
#define LAST_NODE (next_indent = " ")
VALUE
rb_dump_literal(VALUE lit)
{
if (!RB_SPECIAL_CONST_P(lit)) {
VALUE str;
switch (RB_BUILTIN_TYPE(lit)) {
case T_CLASS: case T_MODULE: case T_ICLASS:
str = rb_class_path(lit);
if (FL_TEST(lit, FL_SINGLETON)) {
str = rb_sprintf("<%"PRIsVALUE">", str);
}
return str;
default:
break;
}
}
return rb_inspect(lit);
}
static void
add_indent(VALUE buf, VALUE indent)
{
AR(indent);
}
static void
add_id(VALUE buf, ID id)
{
if (id == 0) {
A("(null)");
}
else {
VALUE str = rb_id2str(id);
if (str) {
A(":"); AR(str);
}
else {
rb_str_catf(buf, "(internal variable: 0x%"PRIsVALUE")", id);
}
}
}
struct add_option_arg {
VALUE buf, indent;
st_index_t count;
};
static void dump_node(VALUE, VALUE, int, const NODE *);
static const char default_indent[] = "| ";
static void
dump_array(VALUE buf, VALUE indent, int comment, const NODE *node)
{
int field_flag;
const char *next_indent = default_indent;
F_LONG(nd_alen, "length");
F_NODE(nd_head, "element");
while (node->nd_next && nd_type_p(node->nd_next, NODE_LIST)) {
node = node->nd_next;
F_NODE(nd_head, "element");
}
LAST_NODE;
F_NODE(nd_next, "next element");
}
static void
dump_node(VALUE buf, VALUE indent, int comment, const NODE * node)
{
int field_flag;
int i;
const char *next_indent = default_indent;
enum node_type type;
if (!node) {
D_NULL_NODE;
return;
}
D_NODE_HEADER(node);
type = nd_type(node);
switch (type) {
case NODE_BLOCK:
ANN("statement sequence");
ANN("format: [nd_head]; ...; [nd_next]");
ANN("example: foo; bar");
i = 0;
do {
A_INDENT;
rb_str_catf(buf, "+- nd_head (%s%d):\n",
comment ? "statement #" : "", ++i);
if (!node->nd_next) LAST_NODE;
D_INDENT;
dump_node(buf, indent, comment, node->nd_head);
D_DEDENT;
} while (node->nd_next &&
nd_type_p(node->nd_next, NODE_BLOCK) &&
(node = node->nd_next, 1));
if (node->nd_next) {
LAST_NODE;
F_NODE(nd_next, "next block");
}
return;
case NODE_IF:
ANN("if statement");
ANN("format: if [nd_cond] then [nd_body] else [nd_else] end");
ANN("example: if x == 1 then foo else bar end");
F_NODE(nd_cond, "condition expr");
F_NODE(nd_body, "then clause");
LAST_NODE;
F_NODE(nd_else, "else clause");
return;
case NODE_UNLESS:
ANN("unless statement");
ANN("format: unless [nd_cond] then [nd_body] else [nd_else] end");
ANN("example: unless x == 1 then foo else bar end");
F_NODE(nd_cond, "condition expr");
F_NODE(nd_body, "then clause");
LAST_NODE;
F_NODE(nd_else, "else clause");
return;
case NODE_CASE:
ANN("case statement");
ANN("format: case [nd_head]; [nd_body]; end");
ANN("example: case x; when 1; foo; when 2; bar; else baz; end");
F_NODE(nd_head, "case expr");
LAST_NODE;
F_NODE(nd_body, "when clauses");
return;
case NODE_CASE2:
ANN("case statement with no head");
ANN("format: case; [nd_body]; end");
ANN("example: case; when 1; foo; when 2; bar; else baz; end");
F_NODE(nd_head, "case expr");
LAST_NODE;
F_NODE(nd_body, "when clauses");
return;
case NODE_CASE3:
ANN("case statement (pattern matching)");
ANN("format: case [nd_head]; [nd_body]; end");
ANN("example: case x; in 1; foo; in 2; bar; else baz; end");
F_NODE(nd_head, "case expr");
LAST_NODE;
F_NODE(nd_body, "in clauses");
return;
case NODE_WHEN:
ANN("when clause");
ANN("format: when [nd_head]; [nd_body]; (when or else) [nd_next]");
ANN("example: case x; when 1; foo; when 2; bar; else baz; end");
F_NODE(nd_head, "when value");
F_NODE(nd_body, "when body");
LAST_NODE;
F_NODE(nd_next, "next when clause");
return;
case NODE_IN:
ANN("in clause");
ANN("format: in [nd_head]; [nd_body]; (in or else) [nd_next]");
ANN("example: case x; in 1; foo; in 2; bar; else baz; end");
F_NODE(nd_head, "in pattern");
F_NODE(nd_body, "in body");
LAST_NODE;
F_NODE(nd_next, "next in clause");
return;
case NODE_WHILE:
ANN("while statement");
ANN("format: while [nd_cond]; [nd_body]; end");
ANN("example: while x == 1; foo; end");
goto loop;
case NODE_UNTIL:
ANN("until statement");
ANN("format: until [nd_cond]; [nd_body]; end");
ANN("example: until x == 1; foo; end");
loop:
F_CUSTOM1(nd_state, "begin-end-while?") {
A_INT((int)node->nd_state);
A((node->nd_state == 1) ? " (while-end)" : " (begin-end-while)");
}
F_NODE(nd_cond, "condition");
LAST_NODE;
F_NODE(nd_body, "body");
return;
case NODE_ITER:
ANN("method call with block");
ANN("format: [nd_iter] { [nd_body] }");
ANN("example: 3.times { foo }");
goto iter;
case NODE_FOR:
ANN("for statement");
ANN("format: for * in [nd_iter] do [nd_body] end");
ANN("example: for i in 1..3 do foo end");
iter:
F_NODE(nd_iter, "iteration receiver");
LAST_NODE;
F_NODE(nd_body, "body");
return;
case NODE_FOR_MASGN:
ANN("vars of for statement with masgn");
ANN("format: for [nd_var] in ... do ... end");
ANN("example: for x, y in 1..3 do foo end");
LAST_NODE;
F_NODE(nd_var, "var");
return;
case NODE_BREAK:
ANN("break statement");
ANN("format: break [nd_stts]");
ANN("example: break 1");
goto jump;
case NODE_NEXT:
ANN("next statement");
ANN("format: next [nd_stts]");
ANN("example: next 1");
goto jump;
case NODE_RETURN:
ANN("return statement");
ANN("format: return [nd_stts]");
ANN("example: return 1");
jump:
LAST_NODE;
F_NODE(nd_stts, "value");
return;
case NODE_REDO:
ANN("redo statement");
ANN("format: redo");
ANN("example: redo");
return;
case NODE_RETRY:
ANN("retry statement");
ANN("format: retry");
ANN("example: retry");
return;
case NODE_BEGIN:
ANN("begin statement");
ANN("format: begin; [nd_body]; end");
ANN("example: begin; 1; end");
LAST_NODE;
F_NODE(nd_body, "body");
return;
case NODE_RESCUE:
ANN("rescue clause");
ANN("format: begin; [nd_body]; (rescue) [nd_resq]; else [nd_else]; end");
ANN("example: begin; foo; rescue; bar; else; baz; end");
F_NODE(nd_head, "body");
F_NODE(nd_resq, "rescue clause list");
LAST_NODE;
F_NODE(nd_else, "rescue else clause");
return;
case NODE_RESBODY:
ANN("rescue clause (cont'd)");
ANN("format: rescue [nd_args]; [nd_body]; (rescue) [nd_head]");
ANN("example: begin; foo; rescue; bar; else; baz; end");
F_NODE(nd_args, "rescue exceptions");
F_NODE(nd_body, "rescue clause");
LAST_NODE;
F_NODE(nd_head, "next rescue clause");
return;
case NODE_ENSURE:
ANN("ensure clause");
ANN("format: begin; [nd_head]; ensure; [nd_ensr]; end");
ANN("example: begin; foo; ensure; bar; end");
F_NODE(nd_head, "body");
LAST_NODE;
F_NODE(nd_ensr, "ensure clause");
return;
case NODE_AND:
ANN("&& operator");
ANN("format: [nd_1st] && [nd_2nd]");
ANN("example: foo && bar");
goto andor;
case NODE_OR:
ANN("|| operator");
ANN("format: [nd_1st] || [nd_2nd]");
ANN("example: foo || bar");
andor:
while (1) {
F_NODE(nd_1st, "left expr");
if (!node->nd_2nd || !nd_type_p(node->nd_2nd, type))
break;
node = node->nd_2nd;
}
LAST_NODE;
F_NODE(nd_2nd, "right expr");
return;
case NODE_MASGN:
ANN("multiple assignment");
ANN("format: [nd_head], [nd_args] = [nd_value]");
ANN("example: a, b = foo");
F_NODE(nd_value, "rhsn");
F_NODE(nd_head, "lhsn");
if (NODE_NAMED_REST_P(node->nd_args)) {
LAST_NODE;
F_NODE(nd_args, "splatn");
}
else {
F_MSG(nd_args, "splatn", "NODE_SPECIAL_NO_NAME_REST (rest argument without name)");
}
return;
case NODE_LASGN:
ANN("local variable assignment");
ANN("format: [nd_vid](lvar) = [nd_value]");
ANN("example: x = foo");
F_ID(nd_vid, "local variable");
if (NODE_REQUIRED_KEYWORD_P(node)) {
F_MSG(nd_value, "rvalue", "NODE_SPECIAL_REQUIRED_KEYWORD (required keyword argument)");
}
else {
LAST_NODE;
F_NODE(nd_value, "rvalue");
}
return;
case NODE_DASGN:
ANN("dynamic variable assignment");
ANN("format: [nd_vid](dvar) = [nd_value]");
ANN("example: x = nil; 1.times { x = foo }");
ANN("example: 1.times { x = foo }");
F_ID(nd_vid, "local variable");
if (NODE_REQUIRED_KEYWORD_P(node)) {
F_MSG(nd_value, "rvalue", "NODE_SPECIAL_REQUIRED_KEYWORD (required keyword argument)");
}
else {
LAST_NODE;
F_NODE(nd_value, "rvalue");
}
return;
case NODE_IASGN:
ANN("instance variable assignment");
ANN("format: [nd_vid](ivar) = [nd_value]");
ANN("example: @x = foo");
F_ID(nd_vid, "instance variable");
LAST_NODE;
F_NODE(nd_value, "rvalue");
return;
case NODE_CVASGN:
ANN("class variable assignment");
ANN("format: [nd_vid](cvar) = [nd_value]");
ANN("example: @@x = foo");
F_ID(nd_vid, "class variable");
LAST_NODE;
F_NODE(nd_value, "rvalue");
return;
case NODE_GASGN:
ANN("global variable assignment");
ANN("format: [nd_entry](gvar) = [nd_value]");
ANN("example: $x = foo");
F_GENTRY(nd_entry, "global variable");
LAST_NODE;
F_NODE(nd_value, "rvalue");
return;
case NODE_CDECL:
ANN("constant declaration");
ANN("format: [nd_else]::[nd_vid](constant) = [nd_value]");
ANN("example: X = foo");
if (node->nd_vid) {
F_ID(nd_vid, "constant");
F_MSG(nd_else, "extension", "not used");
}
else {
F_MSG(nd_vid, "constant", "0 (see extension field)");
F_NODE(nd_else, "extension");
}
LAST_NODE;
F_NODE(nd_value, "rvalue");
return;
case NODE_OP_ASGN1:
ANN("array assignment with operator");
ANN("format: [nd_recv] [ [nd_args->nd_head] ] [nd_mid]= [nd_args->nd_body]");
ANN("example: ary[1] += foo");
F_NODE(nd_recv, "receiver");
F_ID(nd_mid, "operator");
F_NODE(nd_args->nd_head, "index");
LAST_NODE;
F_NODE(nd_args->nd_body, "rvalue");
return;
case NODE_OP_ASGN2:
ANN("attr assignment with operator");
ANN("format: [nd_recv].[attr] [nd_next->nd_mid]= [nd_value]");
ANN(" where [attr]: [nd_next->nd_vid]");
ANN("example: struct.field += foo");
F_NODE(nd_recv, "receiver");
F_CUSTOM1(nd_next->nd_vid, "attr") {
if (node->nd_next->nd_aid) A("? ");
A_ID(node->nd_next->nd_vid);
}
F_ID(nd_next->nd_mid, "operator");
LAST_NODE;
F_NODE(nd_value, "rvalue");
return;
case NODE_OP_ASGN_AND:
ANN("assignment with && operator");
ANN("format: [nd_head] &&= [nd_value]");
ANN("example: foo &&= bar");
goto asgn_andor;
case NODE_OP_ASGN_OR:
ANN("assignment with || operator");
ANN("format: [nd_head] ||= [nd_value]");
ANN("example: foo ||= bar");
asgn_andor:
F_NODE(nd_head, "variable");
LAST_NODE;
F_NODE(nd_value, "rvalue");
return;
case NODE_OP_CDECL:
ANN("constant declaration with operator");
ANN("format: [nd_head](constant) [nd_aid]= [nd_value]");
ANN("example: A::B ||= 1");
F_NODE(nd_head, "constant");
F_ID(nd_aid, "operator");
LAST_NODE;
F_NODE(nd_value, "rvalue");
return;
case NODE_CALL:
ANN("method invocation");
ANN("format: [nd_recv].[nd_mid]([nd_args])");
ANN("example: obj.foo(1)");
F_ID(nd_mid, "method id");
F_NODE(nd_recv, "receiver");
LAST_NODE;
F_NODE(nd_args, "arguments");
return;
case NODE_OPCALL:
ANN("method invocation");
ANN("format: [nd_recv] [nd_mid] [nd_args]");
ANN("example: foo + bar");
F_ID(nd_mid, "method id");
F_NODE(nd_recv, "receiver");
LAST_NODE;
F_NODE(nd_args, "arguments");
return;
case NODE_FCALL:
ANN("function call");
ANN("format: [nd_mid]([nd_args])");
ANN("example: foo(1)");
F_ID(nd_mid, "method id");
LAST_NODE;
F_NODE(nd_args, "arguments");
return;
case NODE_VCALL:
ANN("function call with no argument");
ANN("format: [nd_mid]");
ANN("example: foo");
F_ID(nd_mid, "method id");
return;
case NODE_QCALL:
ANN("safe method invocation");
ANN("format: [nd_recv]&.[nd_mid]([nd_args])");
ANN("example: obj&.foo(1)");
F_ID(nd_mid, "method id");
F_NODE(nd_recv, "receiver");
LAST_NODE;
F_NODE(nd_args, "arguments");
return;
case NODE_SUPER:
ANN("super invocation");
ANN("format: super [nd_args]");
ANN("example: super 1");
LAST_NODE;
F_NODE(nd_args, "arguments");
return;
case NODE_ZSUPER:
ANN("super invocation with no argument");
ANN("format: super");
ANN("example: super");
return;
case NODE_LIST:
ANN("list constructor");
ANN("format: [ [nd_head], [nd_next].. ] (length: [nd_alen])");
ANN("example: [1, 2, 3]");
goto ary;
case NODE_VALUES:
ANN("return arguments");
ANN("format: [ [nd_head], [nd_next].. ] (length: [nd_alen])");
ANN("example: return 1, 2, 3");
ary:
dump_array(buf, indent, comment, node);
return;
case NODE_ZLIST:
ANN("empty list constructor");
ANN("format: []");
ANN("example: []");
return;
case NODE_HASH:
if (!node->nd_brace) {
ANN("keyword arguments");
ANN("format: nd_head");
ANN("example: a: 1, b: 2");
}
else {
ANN("hash constructor");
ANN("format: { [nd_head] }");
ANN("example: { 1 => 2, 3 => 4 }");
}
F_CUSTOM1(nd_brace, "keyword arguments or hash literal") {
switch (node->nd_brace) {
case 0: A("0 (keyword argument)"); break;
case 1: A("1 (hash literal)"); break;
}
}
LAST_NODE;
F_NODE(nd_head, "contents");
return;
case NODE_YIELD:
ANN("yield invocation");
ANN("format: yield [nd_head]");
ANN("example: yield 1");
LAST_NODE;
F_NODE(nd_head, "arguments");
return;
case NODE_LVAR:
ANN("local variable reference");
ANN("format: [nd_vid](lvar)");
ANN("example: x");
F_ID(nd_vid, "local variable");
return;
case NODE_DVAR:
ANN("dynamic variable reference");
ANN("format: [nd_vid](dvar)");
ANN("example: 1.times { x = 1; x }");
F_ID(nd_vid, "local variable");
return;
case NODE_IVAR:
ANN("instance variable reference");
ANN("format: [nd_vid](ivar)");
ANN("example: @x");
F_ID(nd_vid, "instance variable");
return;
case NODE_CONST:
ANN("constant reference");
ANN("format: [nd_vid](constant)");
ANN("example: X");
F_ID(nd_vid, "constant");
return;
case NODE_CVAR:
ANN("class variable reference");
ANN("format: [nd_vid](cvar)");
ANN("example: @@x");
F_ID(nd_vid, "class variable");
return;
case NODE_GVAR:
ANN("global variable reference");
ANN("format: [nd_entry](gvar)");
ANN("example: $x");
F_GENTRY(nd_entry, "global variable");
return;
case NODE_NTH_REF:
ANN("nth special variable reference");
ANN("format: $[nd_nth]");
ANN("example: $1, $2, ..");
F_CUSTOM1(nd_nth, "variable") { A("$"); A_LONG(node->nd_nth); }
return;
case NODE_BACK_REF:
ANN("back special variable reference");
ANN("format: $[nd_nth]");
ANN("example: $&, $`, $', $+");
F_CUSTOM1(nd_nth, "variable") {
char name[3] = "$ ";
name[1] = (char)node->nd_nth;
A(name);
}
return;
case NODE_MATCH:
ANN("match expression (against $_ implicitly)");
ANN("format: [nd_lit] (in condition)");
ANN("example: if /foo/; foo; end");
F_LIT(nd_lit, "regexp");
return;
case NODE_MATCH2:
ANN("match expression (regexp first)");
ANN("format: [nd_recv] =~ [nd_value]");
ANN("example: /foo/ =~ 'foo'");
F_NODE(nd_recv, "regexp (receiver)");
if (!node->nd_args) LAST_NODE;
F_NODE(nd_value, "string (argument)");
if (node->nd_args) {
LAST_NODE;
F_NODE(nd_args, "named captures");
}
return;
case NODE_MATCH3:
ANN("match expression (regexp second)");
ANN("format: [nd_recv] =~ [nd_value]");
ANN("example: 'foo' =~ /foo/");
F_NODE(nd_recv, "string (receiver)");
LAST_NODE;
F_NODE(nd_value, "regexp (argument)");
return;
case NODE_LIT:
ANN("literal");
ANN("format: [nd_lit]");
ANN("example: 1, /foo/");
goto lit;
case NODE_STR:
ANN("string literal");
ANN("format: [nd_lit]");
ANN("example: 'foo'");
goto lit;
case NODE_XSTR:
ANN("xstring literal");
ANN("format: [nd_lit]");
ANN("example: `foo`");
lit:
F_LIT(nd_lit, "literal");
return;
case NODE_ONCE:
ANN("once evaluation");
ANN("format: [nd_body]");
ANN("example: /foo#{ bar }baz/o");
LAST_NODE;
F_NODE(nd_body, "body");
return;
case NODE_DSTR:
ANN("string literal with interpolation");
ANN("format: [nd_lit]");
ANN("example: \"foo#{ bar }baz\"");
goto dlit;
case NODE_DXSTR:
ANN("xstring literal with interpolation");
ANN("format: [nd_lit]");
ANN("example: `foo#{ bar }baz`");
goto dlit;
case NODE_DREGX:
ANN("regexp literal with interpolation");
ANN("format: [nd_lit]");
ANN("example: /foo#{ bar }baz/");
goto dlit;
case NODE_DSYM:
ANN("symbol literal with interpolation");
ANN("format: [nd_lit]");
ANN("example: :\"foo#{ bar }baz\"");
dlit:
F_LIT(nd_lit, "preceding string");
if (!node->nd_next) return;
F_NODE(nd_next->nd_head, "interpolation");
LAST_NODE;
F_NODE(nd_next->nd_next, "tailing strings");
return;
case NODE_EVSTR:
ANN("interpolation expression");
ANN("format: \"..#{ [nd_lit] }..\"");
ANN("example: \"foo#{ bar }baz\"");
LAST_NODE;
F_NODE(nd_body, "body");
return;
case NODE_ARGSCAT:
ANN("splat argument following arguments");
ANN("format: ..(*[nd_head], [nd_body..])");
ANN("example: foo(*ary, post_arg1, post_arg2)");
F_NODE(nd_head, "preceding array");
LAST_NODE;
F_NODE(nd_body, "following array");
return;
case NODE_ARGSPUSH:
ANN("splat argument following one argument");
ANN("format: ..(*[nd_head], [nd_body])");
ANN("example: foo(*ary, post_arg)");
F_NODE(nd_head, "preceding array");
LAST_NODE;
F_NODE(nd_body, "following element");
return;
case NODE_SPLAT:
ANN("splat argument");
ANN("format: *[nd_head]");
ANN("example: foo(*ary)");
LAST_NODE;
F_NODE(nd_head, "splat'ed array");
return;
case NODE_BLOCK_PASS:
ANN("arguments with block argument");
ANN("format: ..([nd_head], &[nd_body])");
ANN("example: foo(x, &blk)");
F_NODE(nd_head, "other arguments");
LAST_NODE;
F_NODE(nd_body, "block argument");
return;
case NODE_DEFN:
ANN("method definition");
ANN("format: def [nd_mid] [nd_defn]; end");
ANN("example: def foo; bar; end");
F_ID(nd_mid, "method name");
LAST_NODE;
F_NODE(nd_defn, "method definition");
return;
case NODE_DEFS:
ANN("singleton method definition");
ANN("format: def [nd_recv].[nd_mid] [nd_defn]; end");
ANN("example: def obj.foo; bar; end");
F_NODE(nd_recv, "receiver");
F_ID(nd_mid, "method name");
LAST_NODE;
F_NODE(nd_defn, "method definition");
return;
case NODE_ALIAS:
ANN("method alias statement");
ANN("format: alias [nd_1st] [nd_2nd]");
ANN("example: alias bar foo");
F_NODE(nd_1st, "new name");
LAST_NODE;
F_NODE(nd_2nd, "old name");
return;
case NODE_VALIAS:
ANN("global variable alias statement");
ANN("format: alias [nd_alias](gvar) [nd_orig](gvar)");
ANN("example: alias $y $x");
F_ID(nd_alias, "new name");
F_ID(nd_orig, "old name");
return;
case NODE_UNDEF:
ANN("method undef statement");
ANN("format: undef [nd_undef]");
ANN("example: undef foo");
LAST_NODE;
F_NODE(nd_undef, "old name");
return;
case NODE_CLASS:
ANN("class definition");
ANN("format: class [nd_cpath] < [nd_super]; [nd_body]; end");
ANN("example: class C2 < C; ..; end");
F_NODE(nd_cpath, "class path");
F_NODE(nd_super, "superclass");
LAST_NODE;
F_NODE(nd_body, "class definition");
return;
case NODE_MODULE:
ANN("module definition");
ANN("format: module [nd_cpath]; [nd_body]; end");
ANN("example: module M; ..; end");
F_NODE(nd_cpath, "module path");
LAST_NODE;
F_NODE(nd_body, "module definition");
return;
case NODE_SCLASS:
ANN("singleton class definition");
ANN("format: class << [nd_recv]; [nd_body]; end");
ANN("example: class << obj; ..; end");
F_NODE(nd_recv, "receiver");
LAST_NODE;
F_NODE(nd_body, "singleton class definition");
return;
case NODE_COLON2:
ANN("scoped constant reference");
ANN("format: [nd_head]::[nd_mid]");
ANN("example: M::C");
F_ID(nd_mid, "constant name");
LAST_NODE;
F_NODE(nd_head, "receiver");
return;
case NODE_COLON3:
ANN("top-level constant reference");
ANN("format: ::[nd_mid]");
ANN("example: ::Object");
F_ID(nd_mid, "constant name");
return;
case NODE_DOT2:
ANN("range constructor (incl.)");
ANN("format: [nd_beg]..[nd_end]");
ANN("example: 1..5");
goto dot;
case NODE_DOT3:
ANN("range constructor (excl.)");
ANN("format: [nd_beg]...[nd_end]");
ANN("example: 1...5");
goto dot;
case NODE_FLIP2:
ANN("flip-flop condition (incl.)");
ANN("format: [nd_beg]..[nd_end]");
ANN("example: if (x==1)..(x==5); foo; end");
goto dot;
case NODE_FLIP3:
ANN("flip-flop condition (excl.)");
ANN("format: [nd_beg]...[nd_end]");
ANN("example: if (x==1)...(x==5); foo; end");
dot:
F_NODE(nd_beg, "begin");
LAST_NODE;
F_NODE(nd_end, "end");
return;
case NODE_SELF:
ANN("self");
ANN("format: self");
ANN("example: self");
return;
case NODE_NIL:
ANN("nil");
ANN("format: nil");
ANN("example: nil");
return;
case NODE_TRUE:
ANN("true");
ANN("format: true");
ANN("example: true");
return;
case NODE_FALSE:
ANN("false");
ANN("format: false");
ANN("example: false");
return;
case NODE_ERRINFO:
ANN("virtual reference to $!");
ANN("format: rescue => id");
ANN("example: rescue => id");
return;
case NODE_DEFINED:
ANN("defined? expression");
ANN("format: defined?([nd_head])");
ANN("example: defined?(foo)");
F_NODE(nd_head, "expr");
return;
case NODE_POSTEXE:
ANN("post-execution");
ANN("format: END { [nd_body] }");
ANN("example: END { foo }");
LAST_NODE;
F_NODE(nd_body, "END clause");
return;
case NODE_ATTRASGN:
ANN("attr assignment");
ANN("format: [nd_recv].[nd_mid] = [nd_args]");
ANN("example: struct.field = foo");
F_NODE(nd_recv, "receiver");
F_ID(nd_mid, "method name");
LAST_NODE;
F_NODE(nd_args, "arguments");
return;
case NODE_LAMBDA:
ANN("lambda expression");
ANN("format: -> [nd_body]");
ANN("example: -> { foo }");
LAST_NODE;
F_NODE(nd_body, "lambda clause");
return;
case NODE_OPT_ARG:
ANN("optional arguments");
ANN("format: def method_name([nd_body=some], [nd_next..])");
ANN("example: def foo(a, b=1, c); end");
F_NODE(nd_body, "body");
LAST_NODE;
F_NODE(nd_next, "next");
return;
case NODE_KW_ARG:
ANN("keyword arguments");
ANN("format: def method_name([nd_body=some], [nd_next..])");
ANN("example: def foo(a:1, b:2); end");
F_NODE(nd_body, "body");
LAST_NODE;
F_NODE(nd_next, "next");
return;
case NODE_POSTARG:
ANN("post arguments");
ANN("format: *[nd_1st], [nd_2nd..] = ..");
ANN("example: a, *rest, z = foo");