292 lines
8.5 KiB
C#
292 lines
8.5 KiB
C#
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//
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// ExpressionCollection.cs
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//
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// Author:
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// Marek Sieradzki (marek.sieradzki@gmail.com)
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// Ankit Jain (jankit@novell.com)
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//
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// (C) 2006 Marek Sieradzki
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// Copyright 2009 Novell, Inc (http://www.novell.com)
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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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using Microsoft.Build.Framework;
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using Microsoft.Build.Utilities;
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namespace Microsoft.Build.BuildEngine {
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internal class ExpressionCollection {
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IList objects;
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static Dictionary<string, bool> boolValues;
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static ExpressionCollection ()
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{
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string[] trueValuesArray = new string[] {"true", "on", "yes"};
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string[] falseValuesArray = new string[] {"false", "off", "no"};
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boolValues = new Dictionary<string, bool> (StringComparer.OrdinalIgnoreCase);
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foreach (string s in trueValuesArray)
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boolValues.Add (s, true);
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foreach (string s in falseValuesArray)
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boolValues.Add (s, false);
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}
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public ExpressionCollection ()
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{
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objects = new ArrayList ();
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}
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public int Count {
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get { return objects.Count; }
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}
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public void Add (IReference reference)
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{
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objects.Add (reference);
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}
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public void Add (string s)
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{
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objects.Add (s);
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}
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public object ConvertTo (Project project, Type type, ExpressionOptions options)
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{
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if (type.IsArray) {
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if (type == typeof (ITaskItem[]))
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return ConvertToITaskItemArray (project, options);
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else
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return ConvertToArray (project, type, options);
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} else {
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if (type == typeof (ITaskItem))
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return ConvertToITaskItem (project, options);
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else
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return ConvertToNonArray (project, type, options);
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}
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}
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public IEnumerator GetEnumerator ()
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{
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foreach (object o in objects)
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yield return o;
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}
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object ConvertToNonArray (Project project, Type type, ExpressionOptions options)
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{
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return ConvertToObject (ConvertToString (project, options), type, options);
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}
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object ConvertToArray (Project project, Type type, ExpressionOptions options)
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{
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ITaskItem[] items = ConvertToITaskItemArray (project, options);
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Type element_type = type.GetElementType ();
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Array arr = Array.CreateInstance (element_type, items.Length);
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for (int i = 0; i < arr.Length; i ++)
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arr.SetValue (ConvertToObject (items [i].ItemSpec, element_type, options), i);
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return arr;
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}
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object ConvertToObject (string raw, Type type, ExpressionOptions options)
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{
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if (type == typeof (bool)) {
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bool value;
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if (boolValues.TryGetValue (raw, out value))
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return value;
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else
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return false;
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}
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if (type == typeof (string))
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return raw;
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if (type.IsPrimitive)
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return Convert.ChangeType (raw, type);
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if (type == typeof (DateTime))
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return DateTime.Parse (raw);
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throw new Exception (String.Format ("Unsupported type: {0}", type));
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}
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string ConvertToString (Project project, ExpressionOptions options)
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{
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StringBuilder sb = new StringBuilder ();
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foreach (object o in objects) {
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string s = o as string;
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if (s != null) {
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sb.Append (s);
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continue;
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}
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IReference br = o as IReference;
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if (br != null)
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sb.Append (br.ConvertToString (project, options));
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else
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throw new Exception ("BUG: Invalid type in objects collection.");
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}
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return sb.ToString ();
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}
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ITaskItem ConvertToITaskItem (Project project, ExpressionOptions options)
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{
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if (objects == null)
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throw new Exception ("Cannot cast empty expression to ITaskItem.");
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ITaskItem[] items = ConvertToITaskItemArray (project, options);
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if (items.Length > 1)
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//FIXME: msbuild gives better errors
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throw new Exception (String.Format ("Exactly one item required, but got: {0}", items.Length));
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if (items.Length == 0) return null;
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return items [0];
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}
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// Concat rules (deduced)
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// - ItemRef can concat only with a string ';' or PropertyRef ending in ';'
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// - MetadataRef can concat with anything other than ItemRef
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// - PropertyRef cannot be right after a ItemRef
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// PropertyRef concats if it doesn't end in ';'
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// - string cannot concat with ItemRef unless it is ';'.
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// string concats if it ends in ';'
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ITaskItem[] ConvertToITaskItemArray (Project project, ExpressionOptions options)
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{
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List <ITaskItem> finalItems = new List <ITaskItem> ();
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object prev = null;
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bool prev_can_concat = false;
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foreach (object o in objects) {
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bool can_concat = prev_can_concat;
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string str = o as string;
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if (str != null) {
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string trimmed_str = str.Trim ();
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if (!IsSemicolon (str) && trimmed_str.Length > 0 && prev != null && prev is ItemReference)
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// non-empty, non-semicolon string after item ref
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ThrowCantConcatError (prev, str);
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if (trimmed_str.Length == 0 && prev is string && IsSemicolon ((string) prev)) {
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// empty string after a ';', ignore it
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continue;
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}
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// empty string _after_ a itemref, not an error
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prev_can_concat = !(str.Length > 0 && str [str.Length - 1] == ';') && trimmed_str.Length > 0;
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AddItemsToArray (finalItems,
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ConvertToITaskItemArrayFromString (str),
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can_concat);
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prev = o;
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continue;
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}
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IReference br = o as IReference;
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if (br == null)
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throw new Exception ("BUG: Invalid type in objects collection.");
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if (o is ItemReference) {
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if (prev != null && !(prev is string && (string)prev == ";"))
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ThrowCantConcatError (prev, br);
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prev_can_concat = true;
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} else if (o is MetadataReference) {
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if (prev != null && prev is ItemReference)
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ThrowCantConcatError (prev, br);
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prev_can_concat = true;
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} else if (o is PropertyReference) {
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if (prev != null && prev is ItemReference)
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ThrowCantConcatError (prev, br);
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string value = ((PropertyReference) o).GetValue (project);
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prev_can_concat = !(value.Length > 0 && value [value.Length - 1] == ';');
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}
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AddItemsToArray (finalItems, br.ConvertToITaskItemArray (project, options), can_concat);
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prev = o;
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}
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// Trim and Remove empty items
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List<ITaskItem> toRemove = new List<ITaskItem> ();
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for (int i = 0; i < finalItems.Count; i ++) {
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string s = finalItems [i].ItemSpec.Trim ();
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if (s.Length == 0)
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toRemove.Add (finalItems [i]);
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else
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finalItems [i].ItemSpec = s;
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}
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foreach (ITaskItem ti in toRemove)
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finalItems.Remove (ti);
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return finalItems.ToArray ();
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}
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// concat's first item in @items to last item in @list if @concat is true
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// else just adds all @items to @list
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void AddItemsToArray (List<ITaskItem> list, ITaskItem[] items, bool concat)
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{
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if (items == null || items.Length == 0)
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return;
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int start_index = 1;
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if (concat && list.Count > 0)
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list [list.Count - 1].ItemSpec += items [0].ItemSpec;
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else
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start_index = 0;
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for (int i = start_index; i < items.Length; i ++)
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list.Add (items [i]);
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}
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ITaskItem [] ConvertToITaskItemArrayFromString (string source)
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{
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List <ITaskItem> items = new List <ITaskItem> ();
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string [] splitSource = source.Split (new char [] {';'},
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StringSplitOptions.RemoveEmptyEntries);
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foreach (string s in splitSource)
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items.Add (new TaskItem (s));
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return items.ToArray ();
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}
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bool IsSemicolon (string str)
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{
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return str != null && str.Length == 1 && str [0] == ';';
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}
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void ThrowCantConcatError (object first, object second)
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{
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throw new Exception (String.Format (
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"Can't concatenate Item list with other strings where an item list is " +
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"expected ('{0}', '{1}'). Use semi colon to separate items.",
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first.ToString (), second.ToString ()));
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}
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}
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}
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