public JsFilterExpressionStatement(string originalText, JsToken expr, params JsCallExpression[] filters)
{
FilterExpression = new PageVariableFragment(originalText.AsMemory(), expr, new List <JsCallExpression>(filters));
}
public JsFilterExpressionStatement(ReadOnlyMemory <char> originalText, JsToken expr, List <JsCallExpression> filters)
{
FilterExpression = new PageVariableFragment(originalText, expr, filters);
}
protected bool Equals(PageVariableFragment other)
{
return(OriginalText.Span.SequenceEqual(other.OriginalText.Span) &&
Equals(Expression, other.Expression) &&
FilterExpressions.EquivalentTo(other.FilterExpressions));
}
public static List <PageFragment> ParseTemplate(this ScriptContext context, ReadOnlyMemory <char> text)
{
var to = new List <PageFragment>();
if (text.IsNullOrWhiteSpace())
{
return(to);
}
int pos;
var lastPos = 0;
int nextPos()
{
var c1 = text.IndexOf("{{", lastPos);
var c2 = text.IndexOf("{|", lastPos);
if (c2 == -1)
{
return(c1);
}
return(c1 == -1 ? c2 : c1 < c2 ? c1 : c2);
}
while ((pos = nextPos()) != -1)
{
var block = text.Slice(lastPos, pos - lastPos);
if (!block.IsNullOrEmpty())
{
to.Add(new PageStringFragment(block));
}
var varStartPos = pos + 2;
if (varStartPos >= text.Span.Length)
{
throw new SyntaxErrorException($"Unterminated '{{{{' expression, near '{text.Slice(lastPos).DebugLiteral()}'");
}
if (text.Span.SafeCharEquals(varStartPos - 1, '|')) // lang expression syntax {|lang ... |} https://flow.org/en/docs/types/objects/#toc-exact-object-types
{
var literal = text.Slice(varStartPos);
ScriptLanguage lang = null;
if (literal.SafeGetChar(0).IsValidVarNameChar())
{
literal = literal.ParseVarName(out var langSpan);
lang = context.GetScriptLanguage(langSpan.ToString());
if (lang != null)
{
var endPos = literal.IndexOf("|}");
if (endPos == -1)
{
throw new SyntaxErrorException($"Unterminated '|}}' expression, near '{text.Slice(varStartPos).DebugLiteral()}'");
}
var exprStr = literal.Slice(0, endPos);
var langExprFragment = lang.Parse(context, exprStr);
to.AddRange(langExprFragment);
}
}
if (lang == null)
{
var nextLastPos = text.IndexOf("|}", varStartPos) + 2;
block = text.Slice(pos, nextLastPos - pos);
if (!block.IsNullOrEmpty())
{
to.Add(new PageStringFragment(block));
}
}
lastPos = text.IndexOf("|}", varStartPos) + 2;
continue;
}
var firstChar = text.Span[varStartPos];
if (firstChar == '*') //comment
{
lastPos = text.IndexOf("*}}", varStartPos) + 3;
if (text.Span.SafeCharEquals(lastPos, '\r'))
{
lastPos++;
}
if (text.Span.SafeCharEquals(lastPos, '\n'))
{
lastPos++;
}
}
else if (firstChar == '#') //block statement
{
var literal = text.Slice(varStartPos + 1);
literal = literal.ParseTemplateScriptBlock(context, out var blockFragment);
var length = text.Length - pos - literal.Length;
blockFragment.OriginalText = text.Slice(pos, length);
lastPos = pos + length;
to.Add(blockFragment);
}
else
{
var literal = text.Slice(varStartPos).Span;
literal = literal.ParseJsExpression(out var expr, filterExpression: true);
var filters = new List <JsCallExpression>();
if (!literal.StartsWith("}}"))
{
literal = literal.AdvancePastWhitespace();
if (literal.FirstCharEquals(FilterSep))
{
literal = literal.AdvancePastPipeOperator();
while (true)
{
literal = literal.ParseJsCallExpression(out var filter, filterExpression: true);
filters.Add(filter);
literal = literal.AdvancePastWhitespace();
if (literal.IsNullOrEmpty())
{
throw new SyntaxErrorException("Unterminated filter expression");
}
if (literal.StartsWith("}}"))
{
literal = literal.Advance(2);
break;
}
if (!literal.FirstCharEquals(FilterSep))
{
throw new SyntaxErrorException(
$"Expected pipeline operator '|>' but was {literal.DebugFirstChar()}");
}
literal = literal.AdvancePastPipeOperator();
}
}
else if (!literal.AdvancePastWhitespace().IsNullOrEmpty())
{
throw new SyntaxErrorException($"Unexpected syntax '{literal.ToString()}', Expected pipeline operator '|>'");
}
}
else
{
literal = literal.Advance(2);
}
var length = text.Length - pos - literal.Length;
var originalText = text.Slice(pos, length);
lastPos = pos + length;
var varFragment = new PageVariableFragment(originalText, expr, filters);
to.Add(varFragment);
var newLineLen = literal.StartsWith("\n")
? 1
: literal.StartsWith("\r\n")
? 2
: 0;
if (newLineLen > 0)
{
var lastExpr = varFragment.FilterExpressions?.LastOrDefault();
var filterName = lastExpr?.Name ??
varFragment?.InitialExpression?.Name ?? varFragment.Binding;
if ((filterName != null && context.RemoveNewLineAfterFiltersNamed.Contains(filterName)) ||
expr is JsVariableDeclaration)
{
lastPos += newLineLen;
}
}
}
}
if (lastPos != text.Length)
{
var lastBlock = lastPos == 0 ? text : text.Slice(lastPos);
to.Add(new PageStringFragment(lastBlock));
}
return(to);
}
public static List <PageFragment> ParseTemplate(this ScriptContext context, ReadOnlyMemory <char> text)
{
var to = new List <PageFragment>();
if (text.IsNullOrWhiteSpace())
{
return(to);
}
int pos;
var lastPos = 0;
while ((pos = text.IndexOf("{{", lastPos)) != -1)
{
var block = text.Slice(lastPos, pos - lastPos);
if (!block.IsNullOrEmpty())
{
to.Add(new PageStringFragment(block));
}
var varStartPos = pos + 2;
if (varStartPos >= text.Span.Length)
{
throw new SyntaxErrorException($"Unterminated '{{{{' expression, near '{text.Slice(lastPos).DebugLiteral()}'");
}
var firstChar = text.Span[varStartPos];
if (firstChar == '*') //comment
{
lastPos = text.IndexOf("*}}", varStartPos) + 3;
if (text.Span.SafeCharEquals(lastPos, '\r'))
{
lastPos++;
}
if (text.Span.SafeCharEquals(lastPos, '\n'))
{
lastPos++;
}
}
else if (firstChar == '#') //block statement
{
var literal = text.Slice(varStartPos + 1);
literal = literal.ParseTemplateScriptBlock(context, out var blockFragment);
var length = text.Length - pos - literal.Length;
blockFragment.OriginalText = text.Slice(pos, length);
lastPos = pos + length;
to.Add(blockFragment);
}
else
{
var literal = text.Slice(varStartPos).Span;
literal = literal.ParseJsExpression(out var expr, filterExpression: true);
var filters = new List <JsCallExpression>();
if (!literal.StartsWith("}}"))
{
literal = literal.AdvancePastWhitespace();
if (literal.FirstCharEquals(FilterSep))
{
literal = literal.Advance(1);
while (true)
{
literal = literal.ParseJsCallExpression(out var filter, filterExpression: true);
filters.Add(filter);
literal = literal.AdvancePastWhitespace();
if (literal.IsNullOrEmpty())
{
throw new SyntaxErrorException("Unterminated filter expression");
}
if (literal.StartsWith("}}"))
{
literal = literal.Advance(2);
break;
}
if (!literal.FirstCharEquals(FilterSep))
{
throw new SyntaxErrorException(
$"Expected filter separator '|' but was {literal.DebugFirstChar()}");
}
literal = literal.Advance(1);
}
}
else
{
if (!literal.IsNullOrEmpty())
{
literal = literal.Advance(1);
}
}
}
else
{
literal = literal.Advance(2);
}
var length = text.Length - pos - literal.Length;
var originalText = text.Slice(pos, length);
lastPos = pos + length;
var varFragment = new PageVariableFragment(originalText, expr, filters);
to.Add(varFragment);
var newLineLen = literal.StartsWith("\n")
? 1
: literal.StartsWith("\r\n")
? 2
: 0;
if (newLineLen > 0)
{
var lastExpr = varFragment.FilterExpressions?.LastOrDefault();
var filterName = lastExpr?.Name ??
varFragment?.InitialExpression?.Name ?? varFragment.Binding;
if (filterName != null && context.RemoveNewLineAfterFiltersNamed.Contains(filterName))
{
lastPos += newLineLen;
}
}
}
}
if (lastPos != text.Length)
{
var lastBlock = lastPos == 0 ? text : text.Slice(lastPos);
to.Add(new PageStringFragment(lastBlock));
}
return(to);
}