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/* ****************************************************************************

*

* Copyright (c) Microsoft Corporation.

*

* This source code is subject to terms and conditions of the Apache License, Version 2.0. A

* copy of the license can be found in the License.html file at the root of this distribution. If

* you cannot locate the Apache License, Version 2.0, please send an email to

* dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound

* by the terms of the Apache License, Version 2.0.

*

* You must not remove this notice, or any other, from this software.

*

*

* ***************************************************************************/

using System.CodeDom;

using System.Collections.Generic;

using Microsoft.Scripting.Runtime;

#if FEATURE_CODEDOM

namespace IronPython.Hosting {

internal class PythonCodeDomCodeGen : CodeDomCodeGen {

// Tracks the indents found in user provided snippets

private Stack<int> _indents = new Stack<int>(new int[] { 0 });

// Tracks the indent level that is required by generated

// nesting levels (that the user can't see)

private int _generatedIndent = 0;

protected override void WriteExpressionStatement(CodeExpressionStatement s) {

Writer.Write(new string(' ', _generatedIndent + _indents.Peek()));

WriteExpression(s.Expression);

Writer.Write("\n");

}

protected override void WriteSnippetExpression(CodeSnippetExpression e) {

Writer.Write(IndentSnippet(e.Value));

}

protected override void WriteSnippetStatement(CodeSnippetStatement s) {

string snippet = s.Value;

// Finally, append the snippet. Make sure that it is indented properly if

// it has nested newlines

Writer.Write(IndentSnippetStatement(snippet));

Writer.Write('\n');

// See if the snippet changes our indent level

string lastLine = snippet.Substring(snippet.LastIndexOf('\n') + 1);

// If the last line is only whitespace, then we have a new indent level

if (string.IsNullOrEmpty(lastLine.Trim('\t', ' '))) {

lastLine = lastLine.Replace("\t", " ");

int indentLen = lastLine.Length;

if (indentLen > _indents.Peek()) {

_indents.Push(indentLen);

}

else {

while (indentLen < _indents.Peek()) {

_indents.Pop();

}

}

}

}

protected override void WriteFunctionDefinition(CodeMemberMethod func) {

Writer.Write("def ");

Writer.Write(func.Name);

Writer.Write("(");

for (int i = 0; i < func.Parameters.Count; ++i) {

if (i != 0) {

Writer.Write(",");

}

Writer.Write(func.Parameters[i].Name);

}

Writer.Write("):\n");

int baseIndent = _indents.Peek();

_generatedIndent += 4;

foreach (CodeStatement stmt in func.Statements) {

WriteStatement(stmt);

}

_generatedIndent -= 4;

while (_indents.Peek() > baseIndent) {

_indents.Pop();

}

}

protected override string QuoteString(string val) {

return "'''" + val.Replace(@"\", @"\\").Replace("'''", @"\'''") + "'''";

}

private string IndentSnippet(string block) {

return block.Replace("\n", "\n" + new string(' ', _generatedIndent));

}

private string IndentSnippetStatement(string block) {

return new string(' ', _generatedIndent) + IndentSnippet(block);

}

}

}

#endif