293 lines
8.8 KiB
C#
293 lines
8.8 KiB
C#
//
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// ConditionParser.cs
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//
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// Author:
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// Marek Sieradzki (marek.sieradzki@gmail.com)
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// Jaroslaw Kowalski <jaak@jkowalski.net>
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//
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// (C) 2006 Marek Sieradzki
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// (C) 2004-2006 Jaroslaw Kowalski
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Text;
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namespace Microsoft.Build.BuildEngine {
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internal class ConditionParser {
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ConditionTokenizer tokenizer;
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string conditionStr;
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ConditionParser (string condition)
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{
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tokenizer = new ConditionTokenizer ();
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tokenizer.Tokenize (condition);
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conditionStr = condition;
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}
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public static bool ParseAndEvaluate (string condition, Project context)
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{
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if (String.IsNullOrEmpty (condition))
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return true;
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try {
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ConditionExpression ce = ParseCondition (condition);
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if (!ce.CanEvaluateToBool (context))
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throw new InvalidProjectFileException (String.Format ("Can not evaluate \"{0}\" to bool.", condition));
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return ce.BoolEvaluate (context);
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} catch (ExpressionParseException epe) {
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throw new InvalidProjectFileException (
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String.Format ("Unable to parse condition \"{0}\" : {1}", condition, epe.Message),
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epe);
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} catch (ExpressionEvaluationException epe) {
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throw new InvalidProjectFileException (
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String.Format ("Unable to evaluate condition \"{0}\" : {1}", condition, epe.Message),
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epe);
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}
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}
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public static ConditionExpression ParseCondition (string condition)
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{
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ConditionParser parser = new ConditionParser (condition);
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ConditionExpression e = parser.ParseExpression ();
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if (!parser.tokenizer.IsEOF ())
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throw new ExpressionParseException (String.Format ("Unexpected token found, {0}, in condition \"{1}\"", parser.tokenizer.Token, condition));
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return e;
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}
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ConditionExpression ParseExpression ()
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{
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return ParseBooleanExpression ();
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}
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ConditionExpression ParseBooleanExpression ()
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{
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return ParseBooleanAnd ();
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}
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public static string And (string a, string b)
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{
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return a + " and " + b;
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}
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ConditionExpression ParseBooleanAnd ()
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{
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ConditionExpression e = ParseBooleanOr ();
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while (tokenizer.IsToken (TokenType.And)) {
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tokenizer.GetNextToken ();
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e = new ConditionAndExpression (e, ParseBooleanOr ());
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}
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return e;
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}
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ConditionExpression ParseBooleanOr ()
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{
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ConditionExpression e = ParseRelationalExpression ();
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while (tokenizer.IsToken (TokenType.Or)) {
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tokenizer.GetNextToken ();
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e = new ConditionOrExpression (e, ParseRelationalExpression ());
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}
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return e;
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}
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ConditionExpression ParseRelationalExpression ()
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{
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ConditionExpression e = ParseFactorExpression ();
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Token opToken;
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RelationOperator op;
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if (tokenizer.IsToken (TokenType.Less) ||
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tokenizer.IsToken (TokenType.Greater) ||
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tokenizer.IsToken (TokenType.Equal) ||
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tokenizer.IsToken (TokenType.NotEqual) ||
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tokenizer.IsToken (TokenType.LessOrEqual) ||
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tokenizer.IsToken (TokenType.GreaterOrEqual)) {
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opToken = tokenizer.Token;
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tokenizer.GetNextToken ();
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switch (opToken.Type) {
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case TokenType.Equal:
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op = RelationOperator.Equal;
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break;
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case TokenType.NotEqual:
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op = RelationOperator.NotEqual;
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break;
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case TokenType.Less:
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op = RelationOperator.Less;
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break;
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case TokenType.LessOrEqual:
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op = RelationOperator.LessOrEqual;
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break;
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case TokenType.Greater:
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op = RelationOperator.Greater;
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break;
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case TokenType.GreaterOrEqual:
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op = RelationOperator.GreaterOrEqual;
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break;
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default:
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throw new ExpressionParseException (String.Format ("Wrong relation operator {0}", opToken.Value));
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}
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e = new ConditionRelationalExpression (e, ParseFactorExpression (), op);
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}
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return e;
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}
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ConditionExpression ParseFactorExpression ()
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{
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ConditionExpression e;
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Token token = tokenizer.Token;
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tokenizer.GetNextToken ();
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if (token.Type == TokenType.LeftParen) {
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e = ParseExpression ();
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tokenizer.Expect (TokenType.RightParen);
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} else if (token.Type == TokenType.String && tokenizer.Token.Type == TokenType.LeftParen) {
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e = ParseFunctionExpression (token.Value);
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} else if (token.Type == TokenType.String) {
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e = new ConditionFactorExpression (token);
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} else if (token.Type == TokenType.Number) {
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e = new ConditionFactorExpression (token);
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} else if (token.Type == TokenType.Item || token.Type == TokenType.Property
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|| token.Type == TokenType.Metadata) {
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e = ParseReferenceExpression (token.Value [0]);
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} else if (token.Type == TokenType.Not) {
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e = ParseNotExpression ();
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} else
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throw new ExpressionParseException (String.Format ("Unexpected token {0}, while parsing condition \"{1}\"", token, conditionStr));
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return e;
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}
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ConditionExpression ParseNotExpression ()
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{
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return new ConditionNotExpression (ParseFactorExpression ());
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}
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ConditionExpression ParseFunctionExpression (string function_name)
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{
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return new ConditionFunctionExpression (function_name, ParseFunctionArguments ());
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}
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List <ConditionFactorExpression> ParseFunctionArguments ()
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{
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List <ConditionFactorExpression> list = new List <ConditionFactorExpression> ();
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ConditionFactorExpression e;
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while (true) {
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tokenizer.GetNextToken ();
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if (tokenizer.Token.Type == TokenType.RightParen) {
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tokenizer.GetNextToken ();
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break;
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}
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if (tokenizer.Token.Type == TokenType.Comma)
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continue;
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tokenizer.Putback (tokenizer.Token);
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e = (ConditionFactorExpression) ParseFactorExpression ();
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list.Add (e);
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}
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return list;
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}
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//@prefix: @ or $
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ConditionExpression ParseReferenceExpression (char prefix)
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{
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int token_pos = tokenizer.Token.Position;
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string ref_type = prefix == '$' ? "a property" : "an item list";
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IsAtToken (TokenType.LeftParen, String.Format (
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"Expected {0} at position {1} in condition \"{2}\". Missing opening parantheses after the '{3}'.",
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ref_type, token_pos, conditionStr, prefix));
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if (prefix == '$') {
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//
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// Tjhe scan should consider quoted parenthesis but it breaks on .net as well
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// we are bug compatible
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//
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tokenizer.ScanForClosingParens ();
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} else {
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tokenizer.GetNextToken ();
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}
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if (tokenizer.IsEOF ())
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throw new ExpressionParseException ("Missing closing parenthesis in condition " + conditionStr);
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StringBuilder sb = new StringBuilder ();
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sb.AppendFormat ("{0}({1}", prefix, tokenizer.Token.Value);
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tokenizer.GetNextToken ();
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if (prefix == '@' && tokenizer.Token.Type == TokenType.Transform) {
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tokenizer.GetNextToken ();
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sb.AppendFormat ("->'{0}'", tokenizer.Token.Value);
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tokenizer.GetNextToken ();
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if (tokenizer.Token.Type == TokenType.Comma) {
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tokenizer.GetNextToken ();
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sb.AppendFormat (", '{0}'", tokenizer.Token.Value);
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tokenizer.GetNextToken ();
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}
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}
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IsAtToken (TokenType.RightParen, "Missing closing parenthesis in condition " + conditionStr);
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tokenizer.GetNextToken ();
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sb.Append (")");
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//FIXME: HACKY!
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return new ConditionFactorExpression (new Token (sb.ToString (), TokenType.String, token_pos));
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}
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// used to check current token type
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void IsAtToken (TokenType type, string error_msg)
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{
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if (tokenizer.Token.Type != type) {
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if (!String.IsNullOrEmpty (error_msg))
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throw new ExpressionParseException (error_msg);
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if (tokenizer.Token.Type == TokenType.EOF)
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throw new ExpressionParseException (String.Format (
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"Expected a \"{0}\" but the condition ended abruptly, while parsing condition \"{1}\"",
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Token.TypeAsString (type), conditionStr));
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throw new ExpressionParseException (String.Format (
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"Expected \"{0}\" token, but got {1}, while parsing \"{2}\"",
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Token.TypeAsString (type), tokenizer.Token, conditionStr));
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}
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}
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}
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}
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