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/*
* Copyright (c) 2012-2016 The ANTLR Project. All rights reserved.
* Use of this file is governed by the BSD 3-clause license that
* can be found in the LICENSE.txt file in the project root.
*/
package org.antlr.v4.test.tool;
import org.antlr.v4.runtime.Lexer;
import org.antlr.v4.runtime.Parser;
import org.antlr.v4.runtime.RuleContext;
import org.antlr.v4.runtime.misc.Pair;
import org.antlr.v4.runtime.tree.ParseTree;
import org.antlr.v4.runtime.tree.TerminalNode;
import org.antlr.v4.runtime.tree.xpath.XPath;
import org.junit.Before;
import org.junit.Test;
import java.util.ArrayList;
import java.util.List;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
public class TestXPath extends BaseJavaToolTest {
public static final String grammar =
"grammar Expr;\n" +
"prog: func+ ;\n" +
"func: 'def' ID '(' arg (',' arg)* ')' body ;\n" +
"body: '{' stat+ '}' ;\n" +
"arg : ID ;\n" +
"stat: expr ';' # printExpr\n" +
" | ID '=' expr ';' # assign\n" +
" | 'return' expr ';' # ret\n" +
" | ';' # blank\n" +
" ;\n" +
"expr: expr ('*'|'/') expr # MulDiv\n" +
" | expr ('+'|'-') expr # AddSub\n" +
" | primary # prim\n" +
" ;\n" +
"primary" +
" : INT # int\n" +
" | ID # id\n" +
" | '(' expr ')' # parens\n" +
" ;" +
"\n" +
"MUL : '*' ; // assigns token name to '*' used above in grammar\n" +
"DIV : '/' ;\n" +
"ADD : '+' ;\n" +
"SUB : '-' ;\n" +
"RETURN : 'return' ;\n" +
"ID : [a-zA-Z]+ ; // match identifiers\n" +
"INT : [0-9]+ ; // match integers\n" +
"NEWLINE:'\\r'? '\\n' -> skip; // return newlines to parser (is end-statement signal)\n" +
"WS : [ \\t]+ -> skip ; // toss out whitespace\n";
public static final String SAMPLE_PROGRAM =
"def f(x,y) { x = 3+4; y; ; }\n" +
"def g(x) { return 1+2*x; }\n";
@Before
@Override
public void testSetUp() throws Exception {
super.testSetUp();
}
@Test public void testValidPaths() throws Exception {
boolean ok =
rawGenerateAndBuildRecognizer("Expr.g4", grammar, "ExprParser",
"ExprLexer", false);
assertTrue(ok);
String xpath[] = {
"/prog/func", // all funcs under prog at root
"/prog/*", // all children of prog at root
"/*/func", // all func kids of any root node
"prog", // prog must be root node
"/prog", // prog must be root node
"/*", // any root
"*", // any root
"//ID", // any ID in tree
"//expr/primary/ID",// any ID child of a primary under any expr
"//body//ID", // any ID under a body
"//'return'", // any 'return' literal in tree, matched by literal name
"//RETURN", // any 'return' literal in tree, matched by symbolic name
"//primary/*", // all kids of any primary
"//func/*/stat", // all stat nodes grandkids of any func node
"/prog/func/'def'", // all def literal kids of func kid of prog
"//stat/';'", // all ';' under any stat node
"//expr/primary/!ID", // anything but ID under primary under any expr node
"//expr/!primary", // anything but primary under any expr node
"//!*", // nothing anywhere
"/!*", // nothing at root
"//expr//ID", // any ID under any expression (tests antlr/antlr4#370)
};
String expected[] = {
"[func, func]",
"[func, func]",
"[func, func]",
"[prog]",
"[prog]",
"[prog]",
"[prog]",
"[f, x, y, x, y, g, x, x]",
"[y, x]",
"[x, y, x]",
"[return]",
"[return]",
"[3, 4, y, 1, 2, x]",
"[stat, stat, stat, stat]",
"[def, def]",
"[;, ;, ;, ;]",
"[3, 4, 1, 2]",
"[expr, expr, expr, expr, expr, expr]",
"[]",
"[]",
"[y, x]",
};
for (int i=0; i<xpath.length; i++) {
List<String> nodes = getNodeStrings(SAMPLE_PROGRAM, xpath[i], "prog", "ExprParser", "ExprLexer");
String result = nodes.toString();
assertEquals("path "+xpath[i]+" failed", expected[i], result);
}
}
@Test public void testWeirdChar() throws Exception {
boolean ok =
rawGenerateAndBuildRecognizer("Expr.g4", grammar, "ExprParser",
"ExprLexer", false);
assertTrue(ok);
String path = "&";
String expected = "Invalid tokens or characters at index 0 in path '&'";
testError(SAMPLE_PROGRAM, path, expected, "prog", "ExprParser", "ExprLexer");
}
@Test public void testWeirdChar2() throws Exception {
boolean ok =
rawGenerateAndBuildRecognizer("Expr.g4", grammar, "ExprParser",
"ExprLexer", false);
assertTrue(ok);
String path = "//w&e/";
String expected = "Invalid tokens or characters at index 3 in path '//w&e/'";
testError(SAMPLE_PROGRAM, path, expected, "prog", "ExprParser", "ExprLexer");
}
@Test public void testBadSyntax() throws Exception {
boolean ok =
rawGenerateAndBuildRecognizer("Expr.g4", grammar, "ExprParser",
"ExprLexer", false);
assertTrue(ok);
String path = "///";
String expected = "/ at index 2 isn't a valid rule name";
testError(SAMPLE_PROGRAM, path, expected, "prog", "ExprParser", "ExprLexer");
}
@Test public void testMissingWordAtEnd() throws Exception {
boolean ok =
rawGenerateAndBuildRecognizer("Expr.g4", grammar, "ExprParser",
"ExprLexer", false);
assertTrue(ok);
String path = "//";
String expected = "Missing path element at end of path";
testError(SAMPLE_PROGRAM, path, expected, "prog", "ExprParser", "ExprLexer");
}
@Test public void testBadTokenName() throws Exception {
boolean ok =
rawGenerateAndBuildRecognizer("Expr.g4", grammar, "ExprParser",
"ExprLexer", false);
assertTrue(ok);
String path = "//Ick";
String expected = "Ick at index 2 isn't a valid token name";
testError(SAMPLE_PROGRAM, path, expected, "prog", "ExprParser", "ExprLexer");
}
@Test public void testBadRuleName() throws Exception {
boolean ok =
rawGenerateAndBuildRecognizer("Expr.g4", grammar, "ExprParser",
"ExprLexer", false);
assertTrue(ok);
String path = "/prog/ick";
String expected = "ick at index 6 isn't a valid rule name";
testError(SAMPLE_PROGRAM, path, expected, "prog", "ExprParser", "ExprLexer");
}
protected void testError(String input, String path, String expected,
String startRuleName,
String parserName, String lexerName)
throws Exception
{
Pair<Parser, Lexer> pl = getParserAndLexer(input, parserName, lexerName);
Parser parser = pl.a;
ParseTree tree = execStartRule(startRuleName, parser);
IllegalArgumentException e = null;
try {
XPath.findAll(tree, path, parser);
}
catch (IllegalArgumentException iae) {
e = iae;
}
assertNotNull(e);
assertEquals(expected, e.getMessage());
}
public List<String> getNodeStrings(String input, String xpath,
String startRuleName,
String parserName, String lexerName)
throws Exception
{
Pair<Parser, Lexer> pl = getParserAndLexer(input, parserName, lexerName);
Parser parser = pl.a;
ParseTree tree = execStartRule(startRuleName, parser);
List<String> nodes = new ArrayList<String>();
for (ParseTree t : XPath.findAll(tree, xpath, parser) ) {
if ( t instanceof RuleContext) {
RuleContext r = (RuleContext)t;
nodes.add(parser.getRuleNames()[r.getRuleIndex()]);
}
else {
TerminalNode token = (TerminalNode)t;
nodes.add(token.getText());
}
}
return nodes;
}
}
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