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Merge pull request #619 from sharwell/sempred 

Updated documentation and add argument validation assertion for SemPred
This commit is contained in:
Terence Parr 2014-06-10 16:44:23 -07:00
parent 63069a571d 50cc4ac736
commit 662ef9bfac
1 changed files with 27 additions and 4 deletions
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31
tool/src/org/antlr/v4/codegen/model/SemPred.java
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@ -34,6 +34,8 @@ import org.antlr.v4.codegen.ActionTranslator;
import org.antlr.v4.codegen.CodeGenerator;
import org.antlr.v4.codegen.OutputModelFactory;
import org.antlr.v4.codegen.model.chunk.ActionChunk;
import org.antlr.v4.runtime.atn.AbstractPredicateTransition;
import org.antlr.v4.runtime.misc.NotNull;
import org.antlr.v4.tool.ast.ActionAST;
import org.antlr.v4.tool.ast.GrammarAST;
@ -41,14 +43,35 @@ import java.util.List;
/** */
public class SemPred extends Action {
public String msg; // user-specified string in fail grammar option
public String predicate; // the predicate string with { }? stripped
/**
* The user-specified terminal option {@code fail}, if it was used and the
* value is a string literal. For example:
*
* <p>
* {@code {pred}?<fail='message'>}</p>
*/
public String msg;
/**
* The predicate string with <code>{</code> and <code>}?</code> stripped from the ends.
*/
public String predicate;
/** user-specified action in fail grammar option */
/**
* The translated chunks of the user-specified terminal option {@code fail},
* if it was used and the value is an action. For example:
*
* <p>
* {@code {pred}?<fail={"Java literal"}>}</p>
*/
@ModelElement public List<ActionChunk> failChunks;
public SemPred(OutputModelFactory factory, ActionAST ast) {
public SemPred(OutputModelFactory factory, @NotNull ActionAST ast) {
super(factory,ast);
assert ast.atnState != null
&& ast.atnState.getNumberOfTransitions() == 1
&& ast.atnState.transition(0) instanceof AbstractPredicateTransition;
GrammarAST failNode = ast.getOptionAST("fail");
CodeGenerator gen = factory.getGenerator();
predicate = ast.getText();