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//
// ConditionTextExtractor.cs
//
// Authors:
// Chris Bacon (chrisbacon76@gmail.com)
//
// Copyright (C) 2010 Chris Bacon
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Mono.CodeContracts.Rewrite.AstVisitors;
using System.IO;
namespace Mono.CodeContracts.Rewrite {
class ConditionTextExtractor {
public ConditionTextExtractor (string filename, SourcePositionVisitor.CodePosition start, SourcePositionVisitor.CodePosition end)
{
this.filename = filename;
this.start = start;
this.end = end;
}
private string filename;
private SourcePositionVisitor.CodePosition start, end;
enum State {
FunctionName,
Parameters,
};
private State state;
public string GetConditionText ()
{
if (this.filename == null || this.start.IsEmpty || this.end.IsEmpty){
return "<unknown source code position>";
}
string[] lines;
try {
lines = File.ReadAllLines (this.filename);
} catch {
return "<cannot access source code>";
}
try {
StringBuilder sb = new StringBuilder ();
for (int i = this.start.Line; i <= this.end.Line; i++) {
string line = lines [i - 1];
if (i == this.end.Line && this.end.Column != 0) {
line = line.Substring (0, this.end.Column - 1);
}
if (i == this.start.Line && this.start.Column != 0) {
line = line.Substring (this.start.Column - 1);
}
sb.Append (line.Trim());
}
string cndStr = sb.ToString ();
this.state = State.FunctionName;
var cnd = this.RunStateMachine (cndStr);
return cnd.ToString ().Trim ();
} catch {
return "<source-code parse error>";
}
}
private StringBuilder RunStateMachine (string line)
{
StringBuilder cnd = new StringBuilder ();
int inBrackets = 0;
bool inDoubleQuotes = false;
bool inSingleQuotes = false;
bool inEscape = false;
foreach (char c in line) {
switch (this.state) {
case State.FunctionName:
if (c == '(') {
this.state = State.Parameters;
}
break;
case State.Parameters:
switch (c) {
case ',':
if (inBrackets == 0 && !inDoubleQuotes && !inSingleQuotes) {
return cnd;
}
break;
case '(':
if (!inDoubleQuotes && !inSingleQuotes) {
inBrackets++;
}
break;
case ')':
if (!inDoubleQuotes && !inSingleQuotes) {
if (inBrackets == 0) {
return cnd;
}
inBrackets--;
}
break;
case '"':
if (!inEscape) {
inDoubleQuotes = !inDoubleQuotes;
}
break;
case '\'':
if (!inEscape) {
inSingleQuotes = !inSingleQuotes;
}
break;
case '\\':
inEscape = true;
goto forceEscape;
}
inEscape = false;
forceEscape:
cnd.Append (c);
break;
default:
throw new NotSupportedException ("Cannot handle state: " + this.state);
}
}
return new StringBuilder ("<bad source code>");
}
}
}
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