Support gawk syntax used by the compatibility suite

README.md

@@ -14,11 +14,12 @@ Jawk fully implements POSIX AWK, and adds support for the most commonly used gaw
 
 - Builtins, available by default through the built-in GNU Awk compatibility extension: `asort()`, `asorti()`, `typeof()`, `isarray()`, `mkbool()`, `gensub()`, `patsplit()`, `strtonum()`, `systime()`, `mktime()`, `strftime()`, `bindtextdomain()`, `dcgettext()`, `dcngettext()`, and `PROCINFO["sorted_in"]`-controlled array traversal
 - Arrays of arrays (`a[i][j]`) and typed regexp literals (`@/re/`)
+- Source inclusion with `@include`, namespaces with `@namespace` and `ns::name`, and indirect function calls such as `@functionName(args)`
 - `BEGINFILE` / `ENDFILE` special patterns, with the `ERRNO` and `ARGIND` special variables, so a script can hook into the command-line file processing loop and skip unreadable files without a fatal error
 - The `nextfile` statement
 - The `IGNORECASE`, `SYMTAB`, and `FUNCTAB` special variables
 
-As in gawk, the gawk-specific syntax is not special in `--posix` mode.
+The gawk-specific `@` syntax and arrays-of-arrays syntax are rejected in `--posix` mode.
 
 ## CLI Example
 

src/main/java/io/jawk/Awk.java

@@ -496,7 +496,10 @@ protected final <T extends AwkProgram> T compileProgram(
 		lastAst = null;
 		if (!scripts.isEmpty()) {
 			// Parse all script sources into a single AST
-			AwkParser parser = new AwkParser(this.extensionFunctions, settings.isPosix());
+			AwkParser parser = new AwkParser(
+					this.extensionFunctions,
+					settings.isPosix(),
+					isSourceIncludeAllowed());
 			AstNode ast = parser.parse(scripts);
 			lastAst = ast;
 			if (ast != null) {
@@ -521,6 +524,15 @@ protected final <T extends AwkProgram> T compileProgram(
 		return tuples;
 	}
 
+	/**
+	 * Returns whether scripts compiled by this engine may use {@code @include}.
+	 *
+	 * @return {@code true} for the standard engine
+	 */
+	protected boolean isSourceIncludeAllowed() {
+		return true;
+	}
+
 	/**
 	 * Compile an expression to evaluate (not a full script).
 	 *

src/main/java/io/jawk/Cli.java

@@ -376,7 +376,9 @@ private static void checkParameterHasArgument(String[] args, int argIdx) {
 		}
 	}
 
-	private static final Pattern INITIAL_VAR_PATTERN = Pattern.compile("([_a-zA-Z][_0-9a-zA-Z]*)=(.*)");
+	private static final Pattern INITIAL_VAR_PATTERN = Pattern
+			.compile(
+					"((?:[_a-zA-Z][_0-9a-zA-Z]*::)?[_a-zA-Z][_0-9a-zA-Z]*)=(.*)");
 
 	/**
 	 * Parses a variable assignment passed via <code>-v</code> and stores it in the
@@ -392,6 +394,9 @@ private static void addVariable(AwkSettings settings, String keyValue) {
 					"keyValue \"" + keyValue + "\" must be of the form \"name=value\"");
 		}
 		String name = m.group(1);
+		if (name.startsWith("awk::")) {
+			name = name.substring("awk::".length());
+		}
 		String valueString = m.group(2);
 		settings.putVariable(name, valueString);
 	}

src/main/java/io/jawk/SandboxedAwk.java

@@ -91,6 +91,11 @@ public AwkExpression compileExpression(String expression, boolean disableOptimiz
 		return compileExpression(expression, disableOptimizeParam, new SandboxedCompiledAwkExpression());
 	}
 
+	@Override
+	protected boolean isSourceIncludeAllowed() {
+		return false;
+	}
+
 	@Override
 	public AVM createAvm() {
 		return createAvm(getSettings());