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 async Task <SharpPage> Load()
{
if (IsImmutable)
{
return(this);
}
string contents;
using (var stream = File.OpenRead())
{
contents = await stream.ReadToEndAsync();
}
foreach (var preprocessor in Context.Preprocessors)
{
contents = preprocessor(contents);
}
var lastModified = File.LastModified;
var fileContents = contents.AsMemory();
var pageVars = new Dictionary <string, object>();
var pos = 0;
var bodyContents = fileContents;
fileContents.AdvancePastWhitespace().TryReadLine(out ReadOnlyMemory <char> line, ref pos);
var lineComment = ScriptLanguage.LineComment;
if (line.StartsWith(Format.ArgsPrefix) || (lineComment != null && line.StartsWith(lineComment + Format.ArgsPrefix)))
{
while (fileContents.TryReadLine(out line, ref pos))
{
if (line.Trim().Length == 0)
{
continue;
}
if (line.StartsWith(Format.ArgsSuffix) || (lineComment != null && line.StartsWith(lineComment + Format.ArgsSuffix)))
{
break;
}
if (lineComment != null && line.StartsWith(lineComment))
{
line = line.Slice(lineComment.Length).TrimStart();
}
var colonPos = line.IndexOf(':');
var spacePos = line.IndexOf(' ');
var bracePos = line.IndexOf('{');
var sep = colonPos >= 0 ? ':' : ' ';
if (bracePos > 0 && spacePos > 0 && colonPos > spacePos)
{
sep = ' ';
}
line.SplitOnFirst(sep, out var first, out var last);
var key = first.Trim().ToString();
pageVars[key] = !last.IsEmpty ? last.Trim().ToString() : "";
}
//When page has variables body starts from first non whitespace after variables end
var argsSuffixPos = line.LastIndexOf(Format.ArgsSuffix);
if (argsSuffixPos >= 0)
{
//Start back from the end of the ArgsSuffix
pos -= line.Length - argsSuffixPos - Format.ArgsSuffix.Length;
}
bodyContents = fileContents.SafeSlice(pos).AdvancePastWhitespace();
}
var pageFragments = pageVars.TryGetValue("ignore", out object ignore) &&
("page".Equals(ignore.ToString()) || "template".Equals(ignore.ToString()))
? new List <PageFragment> {
new PageStringFragment(bodyContents)
}
: ScriptLanguage.Parse(Context, bodyContents);
foreach (var fragment in pageFragments)
{
if (fragment is PageVariableFragment var && var.Binding == ScriptConstants.Page)
{
IsLayout = true;
break;
}
}
lock (semaphore)
{
LastModified = lastModified;
LastModifiedCheck = DateTime.UtcNow;
FileContents = fileContents;
Args = pageVars;
BodyContents = bodyContents;
PageFragments = pageFragments.ToArray();
HasInit = true;
LayoutPage = Format.ResolveLayout(this);
}
if (LayoutPage != null)
{
if (!LayoutPage.HasInit)
{
await LayoutPage.Load();
}
else
{
if (Context.DebugMode || Context.CheckForModifiedPagesAfter != null &&
DateTime.UtcNow - LayoutPage.LastModifiedCheck >= Context.CheckForModifiedPagesAfter.Value)
{
LayoutPage.File.Refresh();
LayoutPage.LastModifiedCheck = DateTime.UtcNow;
if (LayoutPage.File.LastModified != LayoutPage.LastModified)
{
await LayoutPage.Load();
}
}
}
}
return(this);
}
public static List <PageFragment> ParseScript(this ScriptContext context, ReadOnlyMemory <char> text)
{
var to = new List <PageFragment>();
ScriptLanguage scriptLanguage = null;
ReadOnlyMemory <char> modifiers = default;
ReadOnlyMemory <char> prevBlock = default;
int startBlockPos = -1;
var cursorPos = 0;
var lastBlockPos = 0;
const int delim = 3; // '```'.length
while (text.TryReadLine(out var line, ref cursorPos))
{
var lineLength = line.Length;
line = line.AdvancePastWhitespace();
if (line.StartsWith("```"))
{
if (scriptLanguage != null && startBlockPos >= 0 && line.Slice(delim).AdvancePastWhitespace().IsEmpty) //is end block
{
var templateFragments = ScriptTemplate.Language.Parse(context, prevBlock);
to.AddRange(templateFragments);
var blockBody = text.ToLineStart(cursorPos, lineLength, startBlockPos);
var blockFragments = scriptLanguage.Parse(context, blockBody, modifiers);
to.AddRange(blockFragments);
prevBlock = default;
startBlockPos = -1;
scriptLanguage = null;
modifiers = null;
lastBlockPos = cursorPos;
continue;
}
if (line.SafeGetChar(delim).IsValidVarNameChar())
{
line = line.Slice(delim).ParseVarName(out var blockNameSpan);
var blockName = blockNameSpan.ToString();
scriptLanguage = context.GetScriptLanguage(blockName);
if (scriptLanguage == null)
{
continue;
}
modifiers = line.AdvancePastChar('|');
var delimLen = text.Span.SafeCharEquals(cursorPos - 2, '\r') ? 2 : 1;
prevBlock = text.Slice(lastBlockPos, cursorPos - lastBlockPos - lineLength - delimLen);
startBlockPos = cursorPos;
}
}
}
var remainingBlock = text.Slice(lastBlockPos);
if (!remainingBlock.IsEmpty)
{
var templateFragments = ScriptTemplate.Language.Parse(context, remainingBlock);
to.AddRange(templateFragments);
}
return(to);
}