protected override bool CompareAndAdvanceImp(
string input,
int pos,
int depth,
RunState runState,
out int index)
{
int depthPlusOne = depth + 1;
// If the start doesn't match the open then this is not a match
if (m_Open.CompareAndAdvance(input, pos, depthPlusOne, runState, out pos))
{
// How far down the rabbit hole are we?
int nestedDepth = 1;
for (; ;)
{
int currentPos = pos;
if (m_Open.CompareAndAdvance(input, currentPos, depthPlusOne, runState, out pos))
{
++nestedDepth;
}
else if (m_Close.CompareAndAdvance(input, currentPos, depthPlusOne, runState, out pos))
{
--nestedDepth;
if (nestedDepth == 0)
{
// Found the end
index = pos;
return(true);
}
}
else
{
// Advance by 1
pos = currentPos + 1;
}
}
}
index = -1;
return(false);
}
protected override void PerformImp(
string input,
int pos,
int depth,
RunState runState,
out int index)
{
if (!m_Comparison.CompareAndAdvance(input, pos, depth + 1, runState, out index))
{
// Reset the position back to the beginning if the comparison is false
index = pos;
}
}
protected override bool CompareAndAdvanceImp(
string input,
int pos,
int depth,
RunState runState,
out int index)
{
bool rv = Comparison.CompareAndAdvance(input, pos, depth + 1, runState, out index);
if (rv)
{
// Do the capture
Length = index - pos;
Captured = input.Substring(pos, Length);
BeginPos = pos;
EndPos = index;
}
return(rv);
}
protected override bool CompareAndAdvanceImp(
string input,
int pos,
int depth,
RunState runState,
out int index)
{
index = -1;
// Basically just loop until the comparison returns true
bool end = false;
int depthPlusOne = depth + 1;
for (index = pos; ;)
{
// Continue??
if (m_ContinueComp != null)
{
if (!m_ContinueComp.Compare(input, index, depthPlusOne, runState))
{
// No.
return(false);
}
}
int previousPos = index;
end = m_Comparison.CompareAndAdvance(input, index, depthPlusOne, runState, out index);
if (end)
{
return(true);
}
// If the comparison fails and we are at the end of the string (last char + 1) then cease to continue
if (previousPos == input.Length)
{
return(false);
}
// Advance by 1 and try again
index = previousPos + ((m_Forwards)?1: -1);
}
}
protected override void PerformImp(
string input,
int pos,
int depth,
RunState runState,
out int index)
{
index = -1;
// Basically just loop until the comparison returns false
bool end = false;
int depthPlusOne = depth + 1;
for (index = pos; index < input.Length && !end;)
{
int previousPos = index;
end = !m_Comparison.CompareAndAdvance(input, index, depthPlusOne, runState, out index);
if (end)
{
index = previousPos;
}
}
}
//TODO does it make sense to have a list of 0 items?
protected override bool CompareAndAdvanceImp(
string input,
int pos,
int depth,
RunState runState,
out int index)
{
index = -1;
// 'i' keeps track of how many iterations (list items) we've had
int i;
bool reachedEndOfList = false;
int depthPlusOne = depth + 1;
for (i = 0;;)
{
#if DEBUG
int dbgPosAtStart = pos;
#endif
// Skip the line wrap if there is one before the list item
m_Options.SkipLineWrap(input, pos, depthPlusOne, runState, out pos);
if (pos >= input.Length)
{
// Reached the end of the input string
break;
}
// Trim left
if (ItemTrim != null)
{
ItemTrim.Perform(input, pos, depthPlusOne, runState, out pos);
if (pos >= input.Length)
{
// Reached the end of the input string
break;
}
}
// Do the comparison
if (!m_Comparison.CompareAndAdvance(input, pos, depthPlusOne, runState, out pos))
{
// This list item does not match so overall it is a fail
index = -1;
return(false);
}
// We've had another successful item match
++i;
// Skip the line wrap if there is one after the list item
m_Options.SkipLineWrap(input, pos, depthPlusOne, runState, out pos);
if (pos >= input.Length)
{
// Reached the end of the input string
break;
}
// Trim right
int beforeRightTrim = pos;
if (ItemTrim != null)
{
ItemTrim.Perform(input, pos, depthPlusOne, runState, out pos);
if (pos >= input.Length)
{
// Reached the end of the input string
break;
}
}
// Did we reach the seperator/delimiter?
int afterSeperator;
if (m_Seperator.CompareAndAdvance(
input,
pos,
depthPlusOne,
runState,
out afterSeperator))
{
// Update the index to be after the seperator
pos = afterSeperator;
// Get another list item
}
else
{
// Must have reached the end of the list
// Keep the index as the first character of the end - key nuance design decision
reachedEndOfList = true;
// If we've reached the end of the list, retreat to before the item trim
pos = beforeRightTrim;
break;
}
}
// Do we have the minimum number of items?
bool rv;
if (MinAmount.HasValue && i < MinAmount.Value)
{
rv = false;
}
// Do we have too many items?
else if (MaxAmount.HasValue && i > MaxAmount.Value)
{
rv = false;
}
else
{
rv = reachedEndOfList;
}
index = pos;
return(rv);
}
// Returns whether this state is enabled
public bool Update(
string input,
int pos,
RunState runState,
out int index)
{
bool orgEnabled = IsEnabled;
index = pos;
if (IsEnabled)
{
// Look for the disable state
int afterDisable;
IsEnabled = !m_Disable.CompareAndAdvance(input, pos, 0, runState, out afterDisable);
if (!IsEnabled)
{
// Skip to after the compare
index = afterDisable;
}
}
else
{
// Look for the enable state
int afterEnable;
IsEnabled = m_Enable.CompareAndAdvance(input, pos, 0, runState, out afterEnable);
if (IsEnabled)
{
// Skip to after the compare
index = afterEnable;
}
}
#if DEBUG
// Has become enabled
if (!orgEnabled && IsEnabled)
{
if (pos <= 9279)
{
//Console.WriteLine(string.Format("enabled: {0}", pos));
}
}
if (pos == 1374)
{
Misc.Break();
}
#endif
#if DEBUG
if (Name == @"style=""" || Name == @"table or th")
{
if (orgEnabled != IsEnabled)
{
/*
* string stringPortion = input.Substring(pos, Math.Min(20, input.Length));
* Console.WriteLine(string.Format("Changed from {0} to {1}. pos: {3} string:\r\n{2}",
* orgEnabled,
* IsEnabled,
* stringPortion,
* pos));
*/
}
}
#endif
return(IsEnabled);
}
protected override bool CompareAndAdvanceImp(
string str,
int firstIndex,
int depth,
RunState runState,
out int index)
{
index = -1;
// Statement index
int stmtIndex;
bool failedMatch = false;
int pos;
int depthPlusOne = depth + 1;
for (stmtIndex = 0, pos = firstIndex; !failedMatch && stmtIndex < m_Statements.Count;
++stmtIndex)
{
// Key nuance design decision. It's OK to perform operations/comparisons even if we have reached the end of
// the string. This is necessary for things like setting variables, comparing against the end of the
// string e.t.c. No doubt there will be bugs presuming this isn't the case but I've only realised
// retrospectively that this is a requirement.
IStatement stmt = m_Statements[stmtIndex];
if (stmt is IOperation)
{
IOperation op = (IOperation)stmt;
op.Perform(str, pos, depthPlusOne, runState, out pos);
}
else
{
if (stmt is IComparisonWithAdvance)
{
IComparisonWithAdvance comp = (IComparisonWithAdvance)stmt;
int previousPos = pos;
if (!comp.CompareAndAdvance(str, pos, depthPlusOne, runState, out pos))
{
// This part of the pattern match failed. Start again (using the outer loop/index) but at
// the next character
failedMatch = true;
}
}
else if (stmt is IComparison)
{
//sidtodo not sure about this - I'm not sure the design of the statement classes is right
IComparison comp = (IComparison)stmt;
if (!comp.Compare(str, pos, depthPlusOne, runState))
{
failedMatch = true;
}
}
}
}
// Got this far without a match?
if (!failedMatch)
{
// Did we execute all statements?
if (stmtIndex == m_Statements.Count)
{
// Exclusions?
if (Exclusion != null)
{
string subStr = str.Substring(firstIndex, pos - firstIndex);
failedMatch = Exclusion.Compare(subStr, 0, depthPlusOne, runState);
}
if (!failedMatch)
{
// Successful match
index = pos;
}
}
else
{
// We did not complete all of the comparisons
// Go to the next character
// Potentially a speedup here? If we reach the end of the input string but cannot complete all
// comparisons then copy the remaining string rather than trying to do any more comparisons?
failedMatch = true;
}
}
return(!failedMatch);
}
private string Process(
string input,
string replaceWith,
IComparisonWithAdvance mainComparison,
Dictionary <string, Capture> capturing,
List <State> stateList,
bool replace,
out int numMatches,
Func <RunState, string, int, string> ReplaceFunc = null,
Action <RunState> InitRunState = null)
{
// The replaced string
StringBuilder replaced = new StringBuilder();
var runState = new RunState();
if (InitRunState != null)
{
InitRunState(runState);
}
numMatches = 0;
// Iterate the input string character by character
for (int outerIndex = 0; outerIndex < input.Length;)
{
runState.Clear();
runState.BeginPos = outerIndex;
#if DEBUG
int dbgInitialOuterIndex = outerIndex;
if (dbgInitialOuterIndex == 1374)
{
Misc.Break();
}
string dbgInputPortion = input.Substring(dbgInitialOuterIndex,
Math.Min(20, input.Length - dbgInitialOuterIndex));
#endif
//// All states enabled?
int afterState = outerIndex;
bool stateEnabled;
if (stateList != null)
{
for (; ;)
{
// If the state becomes enabled, check that directly afterwards we don't encounter a close state
// Imagine we have a state which opens on '<%' and closes on '%>' and the input string is '<%%> ...'
// We enable then instantly disable again. We only stop trying to update the state when updating the
// state doesn't advance the position
int curIndex = afterState;
stateEnabled = UpdateState(stateList, input, afterState, runState, out afterState);
if (curIndex == afterState)
{
// Updating the state did not advance the position - continue with the replace
break;
}
}
}
else
{
stateEnabled = true;
}
// Copy the state string (if any)
if (afterState != outerIndex)
{
string stateString = input.Substring(outerIndex, afterState - outerIndex);
replaced.Append(stateString);
}
// Update the main index
outerIndex = afterState;
if (outerIndex < input.Length)
{
bool matched = stateEnabled;
if (stateEnabled)
{
// Run the statements beginning from 'afterState'
int innerIndex = outerIndex;
int afterMatch;
matched = mainComparison.CompareAndAdvance(input, innerIndex, 0, runState, out afterMatch);
if (matched)
{
// The begin of the matching string
runState.BeginPos = outerIndex;
++numMatches;
// This is a match! :)
// Do the replace
string iterReplaced = ReplaceMatch(replaceWith, ReplaceFunc, capturing, runState, input, afterMatch);
replaced.Append(iterReplaced);
LogMatchReplace(
input,
innerIndex,
afterMatch,
iterReplaced,
capturing);
// Update the outer index and continue iterating from there
outerIndex = afterMatch;
}
}
if (!matched)
{
if (replace)
{
// Match failed: copy this character to the output string and move on to the next one (if this is replace mode)
replaced.Append(input[outerIndex]);
}
++outerIndex;
}
}
}
return(replaced.ToString());
}
