晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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/*
   +----------------------------------------------------------------------+
   | Zend Engine                                                          |
   +----------------------------------------------------------------------+
   | Copyright (c) 1998-2016 Zend Technologies Ltd. (http://www.zend.com) |
   +----------------------------------------------------------------------+
   | This source file is subject to version 2.00 of the Zend license,     |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | http://www.zend.com/license/2_00.txt.                                |
   | If you did not receive a copy of the Zend license and are unable to  |
   | obtain it through the world-wide-web, please send a note to          |
   | license@zend.com so we can mail you a copy immediately.              |
   +----------------------------------------------------------------------+
   | Authors: Bob Weinand <bwoebi@php.net>                                |
   |          Dmitry Stogov <dmitry@zend.com>                             |
   +----------------------------------------------------------------------+
*/

/* $Id$ */

#ifndef ZEND_AST_H
#define ZEND_AST_H

typedef struct _zend_ast zend_ast;

#include "zend.h"

typedef enum _zend_ast_kind {
	/* first 256 kinds are reserved for opcodes */
	ZEND_CONST = 256,
	ZEND_BOOL_AND,
	ZEND_BOOL_OR,
	ZEND_SELECT,
	ZEND_UNARY_PLUS,
	ZEND_UNARY_MINUS,
} zend_ast_kind;

struct _zend_ast {
	unsigned short kind;
	unsigned short children;
	union {
		zval     *val;
		zend_ast *child;
	} u;
};

ZEND_API zend_ast *zend_ast_create_constant(zval *zv);

ZEND_API zend_ast *zend_ast_create_unary(uint kind, zend_ast *op0);
ZEND_API zend_ast *zend_ast_create_binary(uint kind, zend_ast *op0, zend_ast *op1);
ZEND_API zend_ast *zend_ast_create_ternary(uint kind, zend_ast *op0, zend_ast *op1, zend_ast *op2);
ZEND_API zend_ast* zend_ast_create_dynamic(uint kind);
ZEND_API void zend_ast_dynamic_add(zend_ast **ast, zend_ast *op);
ZEND_API void zend_ast_dynamic_shrink(zend_ast **ast);

ZEND_API int zend_ast_is_ct_constant(zend_ast *ast);

ZEND_API void zend_ast_evaluate(zval *result, zend_ast *ast, zend_class_entry *scope TSRMLS_DC);

ZEND_API zend_ast *zend_ast_copy(zend_ast *ast);
ZEND_API void zend_ast_destroy(zend_ast *ast);

#endif