use of org.eclipse.jdt.internal.core.util.CodeSnippetParsingUtil in project che by eclipse.
the class CheASTParser method internalCreateASTForKind.
/**
* Parses the given source between the bounds specified by the given offset (inclusive)
* and the given length and creates and returns a corresponding abstract syntax tree.
* <p>
* When the parse is successful the result returned includes the ASTs for the
* requested source:
* <ul>
* <li>{@link #K_CLASS_BODY_DECLARATIONS K_CLASS_BODY_DECLARATIONS}: The result node
* is a {@link TypeDeclaration TypeDeclaration} whose
* {@link TypeDeclaration#bodyDeclarations() bodyDeclarations}
* are the new trees. Other aspects of the type declaration are unspecified.</li>
* <li>{@link #K_STATEMENTS K_STATEMENTS}: The result node is a
* {@link Block Block} whose {@link Block#statements() statements}
* are the new trees. Other aspects of the block are unspecified.</li>
* <li>{@link #K_EXPRESSION K_EXPRESSION}: The result node is a subclass of
* {@link Expression Expression}. Other aspects of the expression are unspecified.</li>
* </ul>
* The resulting AST node is rooted under an contrived
* {@link CompilationUnit CompilationUnit} node, to allow the
* client to retrieve the following pieces of information
* available there:
* <ul>
* <li>{@linkplain CompilationUnit#getLineNumber(int) Line number map}. Line
* numbers start at 1 and only cover the subrange scanned
* (<code>source[offset]</code> through <code>source[offset+length-1]</code>).</li>
* <li>{@linkplain CompilationUnit#getMessages() Compiler messages}
* and {@linkplain CompilationUnit#getProblems() detailed problem reports}.
* Character positions are relative to the start of
* <code>source</code>; line positions are for the subrange scanned.</li>
* <li>{@linkplain CompilationUnit#getCommentList() Comment list}
* for the subrange scanned.</li>
* </ul>
* The contrived nodes do not have source positions. Other aspects of the
* {@link CompilationUnit CompilationUnit} node are unspecified, including
* the exact arrangment of intervening nodes.
* </p>
* <p>
* Lexical or syntax errors detected while parsing can result in
* a result node being marked as {@link ASTNode#MALFORMED MALFORMED}.
* In more severe failure cases where the parser is unable to
* recognize the input, this method returns
* a {@link CompilationUnit CompilationUnit} node with at least the
* compiler messages.
* </p>
* <p>Each node in the subtree (other than the contrived nodes)
* carries source range(s) information relating back
* to positions in the given source (the given source itself
* is not remembered with the AST).
* The source range usually begins at the first character of the first token
* corresponding to the node; leading whitespace and comments are <b>not</b>
* included. The source range usually extends through the last character of
* the last token corresponding to the node; trailing whitespace and
* comments are <b>not</b> included. There are a handful of exceptions
* (including the various body declarations); the
* specification for these node type spells out the details.
* Source ranges nest properly: the source range for a child is always
* within the source range of its parent, and the source ranges of sibling
* nodes never overlap.
* </p>
* <p>
* This method does not compute binding information; all <code>resolveBinding</code>
* methods applied to nodes of the resulting AST return <code>null</code>.
* </p>
*
* @return an AST node whose type depends on the kind of parse
* requested, with a fallback to a <code>CompilationUnit</code>
* in the case of severe parsing errors
* @see ASTNode#getStartPosition()
* @see ASTNode#getLength()
*/
private ASTNode internalCreateASTForKind() {
final ASTConverter converter = new ASTConverter(this.compilerOptions, false, null);
converter.compilationUnitSource = this.rawSource;
converter.compilationUnitSourceLength = this.rawSource.length;
converter.scanner.setSource(this.rawSource);
AST ast = AST.newAST(this.apiLevel);
ast.setDefaultNodeFlag(ASTNode.ORIGINAL);
ast.setBindingResolver(new BindingResolver());
if ((this.bits & CompilationUnitResolver.STATEMENT_RECOVERY) != 0) {
ast.setFlag(ICompilationUnit.ENABLE_STATEMENTS_RECOVERY);
}
converter.setAST(ast);
CodeSnippetParsingUtil codeSnippetParsingUtil = new CodeSnippetParsingUtil((this.bits & CompilationUnitResolver.IGNORE_METHOD_BODIES) != 0);
CompilationUnit compilationUnit = ast.newCompilationUnit();
if (this.sourceLength == -1) {
this.sourceLength = this.rawSource.length;
}
switch(this.astKind) {
case K_STATEMENTS:
ConstructorDeclaration constructorDeclaration = codeSnippetParsingUtil.parseStatements(this.rawSource, this.sourceOffset, this.sourceLength, this.compilerOptions, true, (this.bits & CompilationUnitResolver.STATEMENT_RECOVERY) != 0);
RecoveryScannerData data = constructorDeclaration.compilationResult.recoveryScannerData;
if (data != null) {
Scanner scanner = converter.scanner;
converter.scanner = new RecoveryScanner(scanner, data.removeUnused());
converter.docParser.scanner = converter.scanner;
converter.scanner.setSource(scanner.source);
compilationUnit.setStatementsRecoveryData(data);
}
RecordedParsingInformation recordedParsingInformation = codeSnippetParsingUtil.recordedParsingInformation;
int[][] comments = recordedParsingInformation.commentPositions;
if (comments != null) {
converter.buildCommentsTable(compilationUnit, comments);
}
compilationUnit.setLineEndTable(recordedParsingInformation.lineEnds);
Block block = ast.newBlock();
block.setSourceRange(this.sourceOffset, this.sourceOffset + this.sourceLength);
org.eclipse.jdt.internal.compiler.ast.Statement[] statements = constructorDeclaration.statements;
if (statements != null) {
int statementsLength = statements.length;
for (int i = 0; i < statementsLength; i++) {
if (statements[i] instanceof org.eclipse.jdt.internal.compiler.ast.LocalDeclaration) {
converter.checkAndAddMultipleLocalDeclaration(statements, i, block.statements());
} else {
Statement statement = converter.convert(statements[i]);
if (statement != null) {
block.statements().add(statement);
}
}
}
}
rootNodeToCompilationUnit(ast, compilationUnit, block, recordedParsingInformation, data);
ast.setDefaultNodeFlag(0);
ast.setOriginalModificationCount(ast.modificationCount());
return block;
case K_EXPRESSION:
org.eclipse.jdt.internal.compiler.ast.Expression expression = codeSnippetParsingUtil.parseExpression(this.rawSource, this.sourceOffset, this.sourceLength, this.compilerOptions, true);
recordedParsingInformation = codeSnippetParsingUtil.recordedParsingInformation;
comments = recordedParsingInformation.commentPositions;
if (comments != null) {
converter.buildCommentsTable(compilationUnit, comments);
}
compilationUnit.setLineEndTable(recordedParsingInformation.lineEnds);
if (expression != null) {
Expression expression2 = converter.convert(expression);
rootNodeToCompilationUnit(expression2.getAST(), compilationUnit, expression2, codeSnippetParsingUtil.recordedParsingInformation, null);
ast.setDefaultNodeFlag(0);
ast.setOriginalModificationCount(ast.modificationCount());
return expression2;
} else {
CategorizedProblem[] problems = recordedParsingInformation.problems;
if (problems != null) {
compilationUnit.setProblems(problems);
}
ast.setDefaultNodeFlag(0);
ast.setOriginalModificationCount(ast.modificationCount());
return compilationUnit;
}
case K_CLASS_BODY_DECLARATIONS:
final org.eclipse.jdt.internal.compiler.ast.ASTNode[] nodes = codeSnippetParsingUtil.parseClassBodyDeclarations(this.rawSource, this.sourceOffset, this.sourceLength, this.compilerOptions, true, (this.bits & CompilationUnitResolver.STATEMENT_RECOVERY) != 0);
recordedParsingInformation = codeSnippetParsingUtil.recordedParsingInformation;
comments = recordedParsingInformation.commentPositions;
if (comments != null) {
converter.buildCommentsTable(compilationUnit, comments);
}
compilationUnit.setLineEndTable(recordedParsingInformation.lineEnds);
if (nodes != null) {
// source has no syntax error or the statement recovery is enabled
TypeDeclaration typeDeclaration = converter.convert(nodes);
typeDeclaration.setSourceRange(this.sourceOffset, this.sourceOffset + this.sourceLength);
rootNodeToCompilationUnit(typeDeclaration.getAST(), compilationUnit, typeDeclaration, codeSnippetParsingUtil.recordedParsingInformation, null);
ast.setDefaultNodeFlag(0);
ast.setOriginalModificationCount(ast.modificationCount());
return typeDeclaration;
} else {
// source has syntax error and the statement recovery is disabled
CategorizedProblem[] problems = recordedParsingInformation.problems;
if (problems != null) {
compilationUnit.setProblems(problems);
}
ast.setDefaultNodeFlag(0);
ast.setOriginalModificationCount(ast.modificationCount());
return compilationUnit;
}
}
throw new IllegalStateException();
}
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