Meta Programming. Nelson Ferraz

Transcrição

1 Meta Programming Nelson Ferraz

2 Resumo Meta Programming Code Generation AppML 23/11/07 Nelson Ferraz 2

3 Meta Programming Programas que manipulam programas Geração de código Em tempo de compilação Ou mesmo em runtime 23/11/07 Nelson Ferraz 3

4 Vantagens Qualidade Consistência Produtividade Abstração 23/11/07 Nelson Ferraz 4

5 Inline Code Expander 23/11/07 Nelson Ferraz 5

6 Inline Code Expander Código Expander Código++ 23/11/07 Nelson Ferraz 6

7 Inline Code Expander protected Long sample_id; protected String sample_type; public class Sample 23/11/07 Nelson Ferraz 7

8 Inline Code Expander $type $name protected Long sample_id; protected String sample_type; public class Sample 23/11/07 Nelson Ferraz 8

9 Inline Code Expander $type $name public class Sample public void set_$name($type p_$name) $name = p_$name; protected Long sample_id; protected String sample_type; public class Sample public $type get_$name() return $name; 23/11/07 Nelson Ferraz <nferraz@gmail.com> 9

10 Inline Code Expander public class Sample public void setsample_id(long p_sample_id) sample_id = p_sample_id; protected Long sample_id; protected String sample_type; public class Sample public Long getsample_id() return sample_id; 23/11/07 Nelson Ferraz <nferraz@gmail.com> 10

11 Inline Code Expander public class Sample public void setsample_id(long p_sample_id) sample_id = p_sample_id; protected Long sample_id; protected String sample_type; public class Sample public Long getsample_id() return sample_id; public void setsample_type(string p_sample_type) sample_type = p_sample_type; public String getsample_type() return sample_type; 23/11/07 Nelson Ferraz <nferraz@gmail.com> 11

12 Inline Code Expander protected Long sample_id; protected String sample_type; protected Long sample_id; protected String sample_type; public class Sample public class Sample public void setsample_id(long p_sample_id) sample_id = p_sample_id; public Long getsample_id() return sample_id; public void setsample_type(string p_sample_type) sample_type = p_sample_type; public String getsample_type() return sample_type; 23/11/07 Nelson Ferraz <nferraz@gmail.com> 12

13 Code Transformation Código 1 Transformation Código 2 23/11/07 Nelson Ferraz <nferraz@gmail.com> 13

14 Code Transformation * Class1 + Long prop1 + Int prop2 + String prop3 * Class2 + String prop1 + String prop2 * Class3 + Long prop1 + String prop2 + Int prop3 23/11/07 Nelson Ferraz <nferraz@gmail.com> 14

15 Code Transformation protected Long prop1; protected Int prop2; protected String prop3; * Class1 + Long prop1 + Int prop2 + String prop3 * Class2 + String prop1 + String prop2 * Class3 + Long prop1 + String prop2 + Int prop3 public class Class1 protected String prop1; protected String prop2; public class Class2 protected Long prop1; protected String prop2; protected Int prop3; public class Class3 23/11/07 Nelson Ferraz <nferraz@gmail.com> 15

16 Filosofia Unix Ferramentas pequenas Fazem apenas uma coisa (e bem) Funcionam como filtros: lêem textos e escrevem textos 23/11/07 Nelson Ferraz <nferraz@gmail.com> 16

17 Filosofia Unix Lang Transformation New Lang Expander New Lang++ * Class1 + Long prop1 + Int prop2 + String prop3 * Class2 + String prop1 + String prop2 * Class3 + Long prop1 + String prop2 + Int prop3 protected Long prop1; protected Int prop2; protected String prop3; public class Class1 protected Long sample_id; protected String sample_type; public class Class1 public void setsample_id(long p_sample_id) sample_id = p_sample_id; public Long getsample_id() return sample_id; public void setsample_type(string p_sample_type) sample_type = p_sample_type; 23/11/07 Nelson Ferraz <nferraz@gmail.com> public String getsample_type() 17 return sample_type;

18 Filosofia Unix Orig Dest * Class1 + Long prop1 + Int prop2 + String prop3 * Class2 + String prop1 + String prop2 protected Long sample_id; protected String sample_type; public class Class1 public void setsample_id(long p_sample_id) sample_id = p_sample_id; public Long getsample_id() return sample_id; * Class3 + Long prop1 + String prop2 + Int prop3 public void setsample_type(string p_sample_type) sample_type = p_sample_type; public String getsample_type() 23/11/07 Nelson Ferraz <nferraz@gmail.com> 18 return sample_type;

19 Orig Dest * Class1 + Long prop1 + Int prop2 + String prop3 * Class2 + String prop1 + String prop2 * Class3 + Long prop1 + String prop2 + Int prop3 CREATE TABLE Class1 ( prop1 type1, prop2 type2, prop3 type3, ); CREATE TABLE Class1 ( prop1 type1, prop2 type2, ); CREATE TABLE Class1 ( prop1 type1, prop2 type2, prop3 type3, ); 23/11/07 Nelson Ferraz <nferraz@gmail.com> 19

20 Orig Dest * Class1 + Long prop1 + Int prop2 + String prop3 * Class2 + String prop1 + String prop2 * Class3 + Long prop1 + String prop2 + Int prop3 class1.html <h1>class1</h1> <form> prop1: <input name= prop1 type= text size= 40 /> prop2: <input name= prop2 type= text size= 40 /> prop3: <input name= prop3 type= text size= 40 /> </form> class2.html <h1>class2</h1> <form> prop1: <input name= prop1 type= text size= 40 /> prop2: <input name= prop2 23/11/07 Nelson Ferraz <nferraz@gmail.com> type= text size= 40 /> 20 </form>

21 AppML Application Markup Language Uma fonte, múltiplas saídas: SQL XML Perl Templates 23/11/07 Nelson Ferraz 21

22 AppML agenda.xml <project name= agenda > </project> 23/11/07 Nelson Ferraz 22

23 AppML agenda.xml <project name= agenda > <table name= contato > </table> </project> 23/11/07 Nelson Ferraz 23

24 AppML agenda.xml <project name= agenda > <table name= contato > <field name= nome /> <field name= endereco /> <field name= telefone /> </table> </project> 23/11/07 Nelson Ferraz 24

25 AppML agenda.xml <project name= agenda > <table name= contato > <field name= nome type= varchar size= 40 /> <field name= endereco type= varchar size= 40 /> <field name= telefone type= varchar size= 40 /> </table> </project> 23/11/07 Nelson Ferraz 25

26 AppML agenda.xml <project name= agenda > <table name= contato > <field name= nome type= varchar size= 40 /> <field name= endereco type= varchar size= 40 /> </table> <table name= telefone > <rel name= pessoa table= contato /> <field name= telefone type= varchar size= 40 /> </table> </project> 23/11/07 Nelson Ferraz 26

27 AppML create.sql CREATE TABLE contato ( id serial primary key, nome varchar(40), endereco varchar(40), created timestamp DEFAULT NOW(), updated timestamp, deleted timestamp ); CREATE TABLE telefone ( id serial primary key, pessoa int references contato, telefone varchar(40), created timestamp DEFAULT NOW(), updated timestamp, deleted timestamp ); 23/11/07 Nelson Ferraz <nferraz@gmail.com> 27

28 AppML view.sql CREATE VIEW view_telefone AS SELECT telefone.telefone, telefone.pessoa, pessoa.nome AS pessoa_nome, pessoa.endereco AS pessoa_endereco FROM telefone LEFT JOIN contato ON (contato.id = telefone.pessoa); 23/11/07 Nelson Ferraz <nferraz@gmail.com> 28

29 AppML frm_telefone.tt2 (...) <form method="post" action="[% url %]/agenda/telefone/list_telefone" onsubmit="return(validation())"> <input type="hidden" name="action" value="[% todo_action %]"> <input type="hidden" name="table" value="telefone"> <input type="hidden" name="id" value="[% my_telefone.id() %]"> <table> <tr> <th class="frm"></th> <td class="frm"> <select name="pessoa"> <option value=""> </option> [% FOREACH row = list_contato %] <option value="[% row.id() %]" [% "selected" IF my_telefone.pessoa() == row.id() %]> [% row.() %] [% END %] </select> [% IF (show_insert_contato == 1) %] <a href="[% url %]/agenda/contato/frm_contato?todo_action=create">insert</a> [% END %] </td> </tr> (...) 23/11/07 Nelson Ferraz <nferraz@gmail.com> 29

30 AppML telefone.pm package agenda::cdbi::telefone; # Project: # Module: # Date: use strict; use base qw( agenda::cdbi ); PACKAGE ->table('telefone'); PACKAGE ->columns(all => qw(id pessoa telefone)); PACKAGE ->has_a(pessoa => 'agenda::cdbi::pessoa'); PACKAGE ->sequence('telefone_id_seq'); 1; 23/11/07 Nelson Ferraz <nferraz@gmail.com> 30

31 SQL::Translator Extrai informações diretamente do SQL Pode ser extendido através de Producers 23/11/07 Nelson Ferraz 31

32 SQL::Translator::Producer::App Perl SQL Templates 23/11/07 Nelson Ferraz 32

33 SQL::Translator::Producer::App 23/11/07 Nelson Ferraz 33