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| grammar Linguagem1; | |
| documento: bloco* ; | |
| bloco: 'h1' Texto | |
| | 'p' Texto | |
| | form | |
| ; | |
| form: 'form' '{' elemento* '}'; | |
| elemento: Id '=' Texto | |
| | 'input' Texto | |
| ; | |
| // Lexer | |
| Id: ('a'..'z')+; | |
| Texto: '"' .*? '"'; | |
| Espaco: [ \t\n\r] -> skip; |
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| package br.edu.ifrn.plp.linguagem1; | |
| import org.antlr.v4.runtime.ParserRuleContext; | |
| import org.antlr.v4.runtime.tree.ParseTreeProperty; | |
| import org.antlr.v4.runtime.tree.TerminalNode; | |
| import br.edu.ifrn.plp.linguagem1.Linguagem1Parser.BlocoContext; | |
| import br.edu.ifrn.plp.linguagem1.Linguagem1Parser.ElementoContext; | |
| public class MeuListener extends Linguagem1BaseListener { | |
| private final ParseTreeProperty<String> valores = new ParseTreeProperty<>(); | |
| private String saida = ""; | |
| public String getSaida() { | |
| return saida; | |
| } | |
| @Override | |
| public void exitDocumento(Linguagem1Parser.DocumentoContext ctx) { | |
| String pagina = "<html>"; | |
| for (BlocoContext filho : ctx.bloco()) { | |
| final String valor = valores.get(filho); | |
| pagina = pagina + valor; | |
| } | |
| pagina = pagina + "</html>"; | |
| saida = pagina; | |
| } | |
| @Override | |
| public void exitH1(Linguagem1Parser.H1Context ctx) { | |
| final String valor = "<h1>" + ctx.Texto().getText() + "</h1>"; | |
| valores.put(ctx, valor); | |
| } | |
| @Override | |
| public void exitParagrafo(Linguagem1Parser.ParagrafoContext ctx) { | |
| final String valor = "<p>" + ctx.Texto().getText() + "</p>"; | |
| valores.put(ctx, valor); | |
| } | |
| @Override | |
| public void exitFormulario(Linguagem1Parser.FormularioContext ctx) { | |
| String form = "<form>"; | |
| for (ElementoContext filho : ctx.elemento()) { | |
| final String valor = valores.get(filho); | |
| form = form + valor; | |
| } | |
| form = form + "</form>"; | |
| valores.put(ctx, form); | |
| } | |
| @Override | |
| public void exitParametro(Linguagem1Parser.ParametroContext ctx) { | |
| String id = ctx.Id().getText(); // valores.get(ctx.Id()) | |
| String texto = ctx.Id().getText(); | |
| String valor = id + " = " + texto; | |
| valores.put(ctx, valor); | |
| } | |
| @Override | |
| public void exitInput(Linguagem1Parser.InputContext ctx) { | |
| String texto = ctx.Texto().getText(); | |
| String valor = "<input name='" + texto + "'>"; | |
| valores.put(ctx, valor); | |
| } | |
| @Override | |
| public void exitEveryRule(ParserRuleContext ctx) { | |
| } | |
| @Override | |
| public void visitTerminal(TerminalNode node) { | |
| } | |
| } |
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| package br.edu.ifrn.plp.linguagem1; | |
| import org.antlr.v4.runtime.ParserRuleContext; | |
| import org.antlr.v4.runtime.misc.NotNull; | |
| import org.antlr.v4.runtime.tree.ParseTree; | |
| import org.antlr.v4.runtime.tree.ParseTreeProperty; | |
| import org.antlr.v4.runtime.tree.TerminalNode; | |
| public class MinhaLinguagem extends linguagemBaseListener { | |
| private final ParseTreeProperty<String> valores = new ParseTreeProperty<>(); | |
| private String saida = ""; | |
| public String getSaida() { | |
| return saida; | |
| } | |
| } |
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| package br.edu.ifrn.plp.linguagem1; | |
| import org.antlr.v4.runtime.*; | |
| import org.antlr.v4.runtime.tree.ParseTree; | |
| import org.antlr.v4.runtime.tree.ParseTreeWalker; | |
| public class Principal { | |
| public static void main(String[] args) { | |
| final ANTLRInputStream input = new ANTLRInputStream("h1 \"ola\"\npg \"TADS\""); | |
| final Linguagem1Lexer lexer = new Linguagem1Lexer(input); | |
| final CommonTokenStream tokens = new CommonTokenStream(lexer); | |
| final Linguagem1Parser parser = new Linguagem1Parser(tokens); | |
| final ParseTree tree = parser.documento(); | |
| final ParseTreeWalker walker = new ParseTreeWalker(); | |
| final MeuListener listener = new MeuListener(); | |
| try { | |
| walker.walk(listener, tree); | |
| } catch (Exception e) { | |
| } | |
| final String saida = listener.getSaida(); | |
| System.out.println(saida); | |
| } | |
| } |
Author
lrlucena
commented
Dec 15, 2016
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