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POantlr4 puppet-style declarative grammar issue
 

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  1. POantlr4 puppet-style declarative grammar issue
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    <p>I'm trying to write a grammer for a puppet-styled declarative language. I have my basic grammar, and a JUnit test trying to implement a Listener approach to loading it. The JUnit test captures the first resource but not the second resource, its almost like the <code>resources</code> rule is never getting evaluated. I added logging statements to my Loader, and resources never gets entered/exited.</p> <pre><code> grammar Bosse; resources : resource+; resource : ID LBRACE STRING COLON attributes RBRACE ; attributes : keyvalue ( COMMA keyvalue )* COMMA? ; keyvalue : ID ASSIGN expr ; expr : STRING | INT | FLOAT ; ID : [a-z]+ ; STRING : SQUOTE (SQESC|.)*? SQUOTE; SQESC : '\\\'' | '\\\\' ; INT : DIGIT+ ; FLOAT : DIGIT+ '.' DIGIT* | '.' DIGIT+ ; ASSIGN : '=&gt;' ; LBRACE : '{' ; RBRACE : '}' ; fragment SQUOTE : '\'' ; COLON : ':' ; COMMA : ',' ; WS : (' '|'\n'|'\t'|'\r')+ -&gt; skip ; fragment DIGIT : [0-9] ; </code></pre> <p>My BaseListener implementation:</p> <pre><code> public class BosseLoader extends BosseBaseListener { private List&lt;Resource&gt; resources = new ArrayList&lt;Resource&gt;(); private String resourceType; private String resourceTitle; private Map&lt;String,Object&gt; attributes = new HashMap&lt;String,Object&gt;(); private String parseString(String str) { str = str.substring(1, str.length()-1); str.replaceAll("\\\\(.)", "\1"); return str; } public List&lt;Resource&gt; getResources() { return resources; } @Override public void enterResources(ResourcesContext ctx) { log.finest("entered "+ctx); } @Override public void exitResources(ResourcesContext ctx) { log.finest("entered "+ctx); } @Override public void enterResource(ResourceContext ctx) { log.finest("entered "+ctx); resourceType = ctx.ID().getText(); resourceTitle = parseString(ctx.STRING().getText()); } @Override public void exitResource(ResourceContext ctx) { log.finest("entered "+ctx); Resource r = new Resource() { public String getTitle() { return resourceTitle; } public String toString() { String type = resourceType.substring(0,1).toUpperCase()+resourceType.substring(1); return type+"["+resourceTitle+"]"; } }; resources.add(r); System.out.println(r); super.exitResource(ctx); } @Override public void enterAttributes(AttributesContext ctx) { log.finest("entered "+ctx); attributes = new HashMap&lt;String,Object&gt;(); } @Override public void exitKeyvalue(KeyvalueContext ctx) { log.finest("entered "+ctx); attributes.put(ctx.ID().getText(),ctx.expr().getText()); } } </code></pre> <p>My JUnit test</p> <pre><code> @Test public void testSyntaxDouble() { System.out.println("testSyntaxDouble()"); String data = "user { 'ruckc' : ensure =&gt; 'present' }\n"+ "user { 'cruck' : ensure =&gt; 'present' }\n"; BosseLoader loader = new BosseLoader(); BosseLexer lexer = new BosseLexer(new ANTLRInputStream(data)); CommonTokenStream tokens = new CommonTokenStream(lexer); BosseParser parser = new BosseParser(tokens); ParseTree tree = parser.resource(); ParseTreeWalker walker = new ParseTreeWalker(); walker.walk(loader, tree); assertEquals(2,loader.getResources().size()); Resource r = loader.getResources().get(0); assertEquals("ruckc", r.getTitle()); assertEquals("User[ruckc]", r.toString()); r = loader.getResources().get(1); assertEquals("cruck", r.getTitle()); assertEquals("User[cruck]", r.toString()); } </code></pre> <p>My test output:</p> <pre><code>testSyntaxDouble() FINEST: AM org.cruck.bosse.language.BosseLoader enterResource entered [] FINEST: AM org.cruck.bosse.language.BosseLoader enterAttributes entered [19] FINEST: AM org.cruck.bosse.language.BosseLoader exitKeyvalue entered [22 19] FINEST: AM org.cruck.bosse.language.BosseLoader exitResource entered [] User[ruckc] Failed tests: testSyntaxDouble(org.cruck.bosse.language.BosseLanguageTest): expected:&lt;2&gt; but was:&lt;1&gt; </code></pre>
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    1. USruckc
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      1. VTUpMod
    1. COYou're calling `parser.resource()`, but shouldn't that be `parser.resources()` (plural!) instead?
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      1. USBart Kiers
    2. COwow... that was it... thanks. i feel stupid now.
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