public void Copy(ProcessOutcome other)
{
Continue = other.Continue;
Leave = other.Leave;
Return = other.Return;
ReturnValue = other.ReturnValue;
}
/// <summary>
/// Process a section of the script, yielding an outcome
/// </summary>
/// <param name="startLine">What line of the script to start on?</param>
/// <param name="endLine">What line of the script to end with?</param>
/// <param name="outcome">Outcome object filled in by processing the script</param>
/// <param name="indentLevel">Indent level for HTML output</param>
/// <returns>Return value from a function call, or null</returns>
public async Task <object> ProcessAsync(int startLine, int endLine, ProcessOutcome outcome, int indentLevel, int callDepth)
{
for (int l = startLine; l <= endLine; ++l)
{
string line = m_lines[l].Trim();
if (line.Length == 0) // skip blank lines
{
continue;
}
char first = line[0];
#if !DEBUG
try
#endif
{
if (line == "/*")
{
++l;
while (m_lines[l].Trim() != "*/")
{
++l;
if (l >= m_lines.Length)
{
throw new ScriptException("Unfinished block comment");
}
}
}
else if (first == '!')
{
// No op
}
else if (line == "{>>")
{
++l;
while (m_lines[l].Trim() != ">>}")
{
m_writer.WriteLine(m_lines[l]);
++l;
if (l >= m_lines.Length)
{
throw new ScriptException("Unfinished block print");
}
}
}
else if (line.StartsWith(">>", StringComparison.Ordinal))
{
string valueStr = line.Substring(">>".Length).Trim();
if (indentLevel > 0)
{
valueStr = new string('\t', indentLevel) + valueStr;
}
m_writer.WriteLine(valueStr);
}
else if (first == '>')
{
string valueStr = line.Substring(1).Trim();
string answer = Utils.ToString(await EvaluateValueAsync(valueStr, indentLevel, callDepth).ConfigureAwait(false));
if (indentLevel > 0)
{
answer = new string('\t', indentLevel) + answer;
}
m_writer.WriteLine(answer);
}
else if (first == '$')
{
line = line.Substring(1);
int equalsIndex = line.IndexOf('=');
string nameStr = line.Substring(0, equalsIndex).Trim();
string valueStr = line.Substring(equalsIndex + 1).Trim();
object answer = await EvaluateValueAsync(valueStr, indentLevel, callDepth).ConfigureAwait(false);
m_symbols.Set(nameStr, answer);
}
else if (first == '&')
{
line = line.Substring(1);
int equalsIndex = line.IndexOf('=');
string nameStr = line.Substring(0, equalsIndex).Trim();
string valueStr = line.Substring(equalsIndex + 1).Trim();
object answer = await EvaluateValueAsync(valueStr, indentLevel, callDepth).ConfigureAwait(false);
m_symbols.Assign(nameStr, answer);
}
else if (first == 'O')
{
int loopEnd = FindMatchingEnd(m_lines, l, endLine);
int loopStart = l;
l = loopEnd;
using (var stacker = new SymbolStacker(m_symbols))
{
while (true)
{
var ourOutcome = new ProcessOutcome();
await ProcessAsync(loopStart + 1, loopEnd - 1, ourOutcome, indentLevel, callDepth + 1).ConfigureAwait(false);
if (ourOutcome.Return)
{
outcome.Return = true;
outcome.ReturnValue = ourOutcome.ReturnValue;
return(ourOutcome.ReturnValue);
}
else if (ourOutcome.Continue)
{
continue;
}
else if (ourOutcome.Leave)
{
break;
}
}
}
}
else if (first == '{')
{
int loopEnd = FindMatchingEnd(m_lines, l, endLine);
int loopStart = l;
l = loopEnd;
using (var stacker = new SymbolStacker(m_symbols))
{
var ourOutcome = new ProcessOutcome();
await ProcessAsync(loopStart + 1, loopEnd - 1, ourOutcome, indentLevel, callDepth + 1).ConfigureAwait(false);
if (ourOutcome.Return)
{
outcome.Return = true;
outcome.ReturnValue = ourOutcome.ReturnValue;
return(ourOutcome.ReturnValue);
}
else if (ourOutcome.Continue)
{
outcome.Continue = true;
return(null);
}
else if (ourOutcome.Leave)
{
outcome.Leave = true;
return(null);
}
}
}
else if (line == "<-" || line == "->")
{
outcome.Return = true;
return(null);
}
else if (line.StartsWith("<- ", StringComparison.Ordinal) ||
line.StartsWith("-> ", StringComparison.Ordinal))
{
int space = line.IndexOf(' ');
string expStr = line.Substring(space + 1);
outcome.ReturnValue = await EvaluateValueAsync(expStr, indentLevel, callDepth).ConfigureAwait(false);
outcome.Return = true;
return(outcome.ReturnValue);
}
else if (line.StartsWith("<{", StringComparison.Ordinal))
{
line = line.Substring("<{".Length).Trim();
int firstSpace = line.IndexOf(' ');
string name;
if (firstSpace < 0)
{
name = line.Trim();
}
else
{
name = line.Substring(0, firstSpace).Trim();
}
Names.ValidateName(name);
index settings = null;
if (firstSpace > 0)
{
string expression = line.Substring(firstSpace + 1).Trim();
if (expression.Length > 0)
{
object expValue = await EvaluateValueAsync(expression, indentLevel, callDepth).ConfigureAwait(false);
if (!(expValue is index))
{
throw new ScriptException("Invalid expression for block tag parameters, must be index");
}
settings = (index)expValue;
}
}
string scriptName = "", formAction = "";
if (name.Equals("form", StringComparison.OrdinalIgnoreCase))
{
object scriptNameObj = null;
if (settings == null || !settings.TryGetValue("script", out scriptNameObj))
{
scriptNameObj = m_scriptName;
}
scriptName = scriptNameObj != null?scriptNameObj.ToString() : "";
object formActionObj = null;
if (settings == null || !settings.TryGetValue("action", out formActionObj))
{
formActionObj = m_formAction;
}
formAction = formActionObj != null?formActionObj.ToString() : "";
}
int loopEnd = FindMatchingEnd(m_lines, l, endLine);
int loopStart = l;
l = loopEnd;
string tag = "<" + name;
if (settings != null)
{
foreach (var kvp in settings.Entries)
{
string key = (string)kvp.Key;
if
(
!key.Equals("script", StringComparison.OrdinalIgnoreCase)
&&
!key.Equals("action", StringComparison.OrdinalIgnoreCase)
)
{
tag
+= " " + kvp.Key
+ "=\"" + Utils.ObjectToHtmlAttribute(kvp.Value) + "\"";
}
}
}
if (!string.IsNullOrWhiteSpace(formAction))
{
tag += " action=\"" + Utils.ObjectToHtmlAttribute(formAction) + "\"";
}
tag += ">";
if (indentLevel > 0)
{
tag = new string('\t', indentLevel) + tag;
}
m_writer.WriteLine(tag);
if (!string.IsNullOrWhiteSpace(scriptName))
{
string hidden = $"<input type=hidden name=script value=\"{Utils.ObjectToHtmlAttribute(scriptName)}\"/>";
if (indentLevel >= 0)
{
hidden = new string('\t', indentLevel + 1) + hidden;
}
m_writer.WriteLine(hidden);
}
try
{
using (var stacker = new SymbolStacker(m_symbols))
{
var ourOutcome = new ProcessOutcome();
await ProcessAsync(loopStart + 1, loopEnd - 1, ourOutcome, indentLevel + 1, callDepth + 1).ConfigureAwait(false);
outcome.Copy(ourOutcome);
if (ourOutcome.Return)
{
return(ourOutcome.ReturnValue);
}
}
}
finally
{
string closingTag = "</" + name + ">";
if (indentLevel > 0)
{
closingTag = new string('\t', indentLevel) + closingTag;
}
m_writer.WriteLine(closingTag);
}
}
else if (first == '<')
{
line = line.Substring(1).Trim();
int firstSpace = line.IndexOf(' ');
string name;
if (firstSpace < 0)
{
name = line;
}
else
{
name = line.Substring(0, firstSpace).Trim();
}
Names.ValidateName(name);
index settings = null;
if (firstSpace > 0)
{
string expression = line.Substring(firstSpace + 1).Trim();
if (expression.Length > 0)
{
object expValue = await EvaluateValueAsync(expression, indentLevel, callDepth).ConfigureAwait(false);
if (!(expValue is index))
{
throw new ScriptException("Invalid expression for blocktag parameters, must be index");
}
settings = (index)expValue;
}
}
if (settings != null && settings.ContainsKey("inner"))
{
string inner = settings["inner"].ToString();
string tag = "<" + name;
foreach (var kvp in settings.Entries)
{
if (kvp.Key.ToString() == "inner")
{
continue;
}
tag += " " + kvp.Key + "=\"" + Utils.ObjectToHtmlAttribute(kvp.Value) + "\"";
}
tag += ">" + inner + "</" + name + ">";
if (indentLevel > 0)
{
tag = new string('\t', indentLevel) + tag;
}
m_writer.WriteLine(tag);
}
else
{
string tag = "<" + name;
if (settings != null)
{
foreach (var kvp in settings.Entries)
{
tag += " " + kvp.Key + "=\"" + Utils.ObjectToHtmlAttribute(kvp.Value) + "\"";
}
}
tag += "/>";
if (indentLevel > 0)
{
tag = new string('\t', indentLevel) + tag;
}
m_writer.WriteLine(tag);
}
}
else if (first == '?')
{
bool seenQuestion = false;
bool seenPlainElse = false;
var markers = FindElses(m_lines, l, endLine);
int endMarker = markers[markers.Count - 1];
l = endMarker;
for (int m = 0; m < markers.Count - 1; ++m)
{
int marker = markers[m];
int nextMarker = markers[Math.Min(m + 1, markers.Count - 1)];
string markerLine = m_lines[marker].Trim();
object answer;
int spaceIndex = markerLine.IndexOf(' ');
if (spaceIndex < 0)
{
if (seenPlainElse)
{
throw new ScriptException("Already seen <> statement");
}
if (!seenQuestion)
{
throw new ScriptException("No ? statement before <> statement");
}
seenPlainElse = true;
answer = true;
}
else
{
seenQuestion = true;
if (seenPlainElse)
{
throw new ScriptException("Already seen <> statement");
}
string criteria = markerLine.Substring(spaceIndex + 1);
answer = await EvaluateValueAsync(criteria, indentLevel, callDepth).ConfigureAwait(false);
if (!(answer is bool))
{
throw new ScriptException("? expression does not evaluate to true or false");
}
}
if (!Utils.BoolCast(answer))
{
continue;
}
using (var stacker = new SymbolStacker(m_symbols))
{
var ourOutcome = new ProcessOutcome();
await ProcessAsync(marker + 1, nextMarker - 1, ourOutcome, indentLevel, callDepth + 1).ConfigureAwait(false);
outcome.Copy(ourOutcome);
if (ourOutcome.Return)
{
return(ourOutcome.ReturnValue);
}
else if (ourOutcome.Continue)
{
return(null);
}
else if (ourOutcome.Leave)
{
return(null);
}
}
break;
}
}
else if (first == '@')
{
int firstSpace = line.IndexOf(' ');
int nextSpace = line.IndexOf(' ', firstSpace + 1);
if (nextSpace < 0)
{
throw new ScriptException("@ statement lacks : part");
}
int thirdSpace = line.IndexOf(' ', nextSpace + 1);
if (thirdSpace < 0)
{
throw new ScriptException("@ statement lacks collection expression");
}
string label = line.Substring(firstSpace, nextSpace - firstSpace).Trim();
Names.ValidateName(label);
string expression = line.Substring(thirdSpace + 1);
int loopEnd = FindMatchingEnd(m_lines, l, endLine);
int loopStart = l;
l = loopEnd;
IEnumerable <object> enumerable = null;
{
object answer = await EvaluateValueAsync(expression, indentLevel, callDepth).ConfigureAwait(false);
if (answer is string)
{
enumerable = ((string)answer).ToCharArray().Select(c => (object)c.ToString());
}
else if (answer is list)
{
enumerable = (list)answer;
}
else if (answer is index)
{
enumerable = new List <object>(((index)answer).Keys);
}
else
{
throw new ScriptException("The @ statement only works with strings, lists, and indexes");
}
}
using (var outerStacker = new SymbolStacker(m_symbols))
{
m_symbols.Set(label, null);
foreach (object val in enumerable)
{
using (var innerStacker = new SymbolStacker(m_symbols))
{
m_symbols.Assign(label, val);
var ourOutcome = new ProcessOutcome();
await ProcessAsync(loopStart + 1, loopEnd - 1, ourOutcome, indentLevel, callDepth + 1).ConfigureAwait(false);
if (ourOutcome.Return)
{
outcome.Copy(ourOutcome);
return(ourOutcome.ReturnValue);
}
else if (ourOutcome.Continue)
{
continue;
}
else if (ourOutcome.Leave)
{
break;
}
}
}
}
}
else if (first == '#')
{
int firstSpace = line.IndexOf(' ');
int nextSpace = line.IndexOf(' ', firstSpace + 1);
if (nextSpace < 0)
{
throw new ScriptException("# statement lacks counter variable");
}
string label = line.Substring(firstSpace, nextSpace - firstSpace).Trim();
Names.ValidateName(label);
int thirdSpace = line.IndexOf(' ', nextSpace + 1);
if (thirdSpace < 0)
{
throw new ScriptException("# statement lacks from part");
}
string from = line.Substring(nextSpace, thirdSpace - nextSpace).Trim();
if (from != ":")
{
throw new ScriptException("# statement invalid : part");
}
string theRest = line.Substring(thirdSpace + 1);
string fromExpStr = null, toExpStr = null;
int parenCount = 0;
bool inString = false;
for (int f = 0; f < theRest.Length - " -> ".Length; ++f)
{
char c = theRest[f];
if (c == '\"' && (f == 0 || theRest[f - 1] != '\\'))
{
inString = !inString;
}
if (!inString)
{
if (c == '(')
{
++parenCount;
}
else if (c == ')')
{
--parenCount;
}
}
if (!inString && parenCount == 0)
{
if (theRest.Substring(f).StartsWith(" -> ", StringComparison.Ordinal))
{
fromExpStr = theRest.Substring(0, f).Trim();
toExpStr = theRest.Substring(f + " -> ".Length).Trim();
break;
}
}
}
object fromValue = await EvaluateValueAsync(fromExpStr, indentLevel, callDepth).ConfigureAwait(false);
if (!(fromValue is double) || Convert.ToInt64(fromValue) != (double)fromValue)
{
throw new ScriptException("Invalid from value: " + fromValue);
}
object toValue = await EvaluateValueAsync(toExpStr, indentLevel, callDepth).ConfigureAwait(false);
if (!(toValue is double) || Convert.ToInt64(toValue) != (double)toValue)
{
throw new ScriptException("Invalid to value: " + toValue);
}
long fromIdx = Convert.ToInt64(fromValue);
long toIdx = Convert.ToInt64(toValue);
int loopEnd = FindMatchingEnd(m_lines, l, endLine);
int loopStart = l;
l = loopEnd;
using (var outerStacker = new SymbolStacker(m_symbols))
{
m_symbols.Set(label, null);
if (fromIdx <= toIdx)
{
for (long i = fromIdx; i <= toIdx; ++i)
{
m_symbols.Assign(label, (double)i);
var ourOutcome = new ProcessOutcome();
await ProcessAsync(loopStart + 1, loopEnd - 1, ourOutcome, indentLevel, callDepth + 1).ConfigureAwait(false);
if (ourOutcome.Return)
{
outcome.Copy(ourOutcome);
return(ourOutcome.ReturnValue);
}
else if (ourOutcome.Continue)
{
continue;
}
else if (ourOutcome.Leave)
{
break;
}
}
}
else
{
for (long i = fromIdx; i >= toIdx; --i)
{
m_symbols.Assign(label, (double)i);
var ourOutcome = new ProcessOutcome();
await ProcessAsync(loopStart + 1, loopEnd - 1, ourOutcome, indentLevel, callDepth + 1).ConfigureAwait(false);
if (ourOutcome.Return)
{
outcome.Copy(ourOutcome);
return(ourOutcome.ReturnValue);
}
else if (ourOutcome.Continue)
{
continue;
}
else if (ourOutcome.Leave)
{
break;
}
}
}
}
}
else if (first == 'f')
{
if (callDepth != 0)
{
throw new ScriptException("Functions can only be defined at the top level, not within anything else");
}
int loopEnd = FindMatchingEnd(m_lines, l, endLine);
int loopStart = l;
l = loopEnd;
}
else if (first == '^')
{
outcome.Continue = true;
return(null);
}
else if (first == 'v')
{
outcome.Leave = true;
return(null);
}
// a side-effect perhaps? like some list.add or msdb.define...?
else if (first == '*')
{
string valueStr = line.Substring(1).Trim();
await EvaluateValueAsync(valueStr, indentLevel, callDepth).ConfigureAwait(false);
}
else
{
throw new ScriptException("Invalid statement: " + line);
}
}
#if !DEBUG
catch (Exception exp)
{
HandleException(exp, line, l);
}
#endif
}
return(null);
}
