/
TemplateExtensions.cs
514 lines (436 loc) · 14.1 KB
/
TemplateExtensions.cs
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using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using ServiceStack.Text;
namespace ServiceStack.Support.Markdown
{
public static class TemplateExtensions
{
private const string UnwantedPrefix = "<p>";
private const string UnwantedSuffix = "</p>";
private const char EscapeChar = '\\';
private const char QuoteChar = '"';
public const char StatementPlaceholderChar = '^';
private const char BeginStatementChar = '{';
private const char EndStatementChar = '}';
private const char BeginMethodChar = '(';
private const char EndMethodChar = ')';
static readonly char[] LineEndChars = new[] { '\r', '\n' };
static readonly char[] WhiteSpaceChars = new[] { ' ', '\t', '\r', '\n' };
static readonly char[] WhiteSpaceAndSymbolChars = new[] {
' ', '\t', '\r', '\n', '(', ')', '!', '+', '-'
};
static readonly bool[] AlphaNumericFlags = new bool[128];
static readonly bool[] MemberExprFlags = new bool[128];
static readonly bool[] StatementFlags = new bool[128];
static readonly bool[] WhiteSpaceFlags = new bool[128];
static TemplateExtensions()
{
for (int i = 'A'; i <= 'Z'; i++)
{
AlphaNumericFlags[i] = true;
MemberExprFlags[i] = true;
StatementFlags[i] = true;
}
for (int i = 'a'; i <= 'z'; i++)
{
AlphaNumericFlags[i] = true;
MemberExprFlags[i] = true;
StatementFlags[i] = true;
}
for (int i = '0'; i <= '9'; i++)
{
AlphaNumericFlags[i] = true;
MemberExprFlags[i] = true;
StatementFlags[i] = true;
}
var exprChars = new[] { '.' }; //removed: '[', ']'
var tokenChars = new[] { '(', ')', '{', '}' };
foreach (var exprChar in exprChars)
{
MemberExprFlags[exprChar] = true;
StatementFlags[exprChar] = true;
}
foreach (var whitespaceChar in WhiteSpaceChars)
{
StatementFlags[whitespaceChar] = true;
WhiteSpaceFlags[whitespaceChar] = true;
}
foreach (var tokenChar in tokenChars)
{
StatementFlags[tokenChar] = true;
}
}
public static string[] SplitOnWhiteSpace(this string text)
{
return text.SplitAndTrimOn(WhiteSpaceChars);
}
public static string[] SplitOnWhiteSpaceAndSymbols(this string text)
{
return text.SplitAndTrimOn(WhiteSpaceAndSymbolChars);
}
public static string[] SplitAndTrimOn(this string text, char[] chars)
{
if (text == null) return TypeConstants.EmptyStringArray;
var parts = text.Split(chars);
var results = new List<string>();
foreach (var part in parts)
{
var val = part.Trim();
if (string.IsNullOrEmpty(val)) continue;
results.Add(part);
}
return results.ToArray();
}
public static string RenderToMarkdown(this MarkdownPage markdownPage, Dictionary<string, object> scopeArgs)
{
return RenderToString(markdownPage, scopeArgs, false);
}
public static string RenderToHtml(this MarkdownPage markdownPage, Dictionary<string, object> scopeArgs)
{
return RenderToString(markdownPage, scopeArgs, true);
}
public static string RenderToString(this MarkdownPage markdownPage, Dictionary<string, object> scopeArgs, bool renderHtml)
{
var writer = StringWriterCache.Allocate();
var pageContext = new PageContext(markdownPage, scopeArgs, renderHtml);
markdownPage.Write(writer, pageContext);
return StringWriterCache.ReturnAndFree(writer);
}
public static string RenderToString(this ITemplateWriter templateWriter, Dictionary<string, object> scopeArgs)
{
var writer = StringWriterCache.Allocate();
templateWriter.Write(null, writer, scopeArgs);
return StringWriterCache.ReturnAndFree(writer);
}
public static string RenderToString(this IEnumerable<ITemplateWriter> templateWriters, Dictionary<string, object> scopeArgs)
{
var writer = StringWriterCache.Allocate();
foreach (var templateWriter in templateWriters)
{
templateWriter.Write(null, writer, scopeArgs);
}
return StringWriterCache.ReturnAndFree(writer);
}
public static List<TemplateBlock> SplitIntoBlocks(this string content, string onPlaceHolder)
{
var blocks = new List<TemplateBlock>();
if (content.IsNullOrEmpty()) return blocks;
var pos = 0;
var lastPos = 0;
while ((pos = content.IndexOf(onPlaceHolder, lastPos)) != -1)
{
var contentBlock = content.Substring(lastPos, pos - lastPos);
blocks.Add(new TextBlock(contentBlock));
lastPos = pos + onPlaceHolder.Length;
}
if (lastPos != content.Length - 1)
{
var lastBlock = content.Substring(lastPos);
blocks.Add(new TextBlock(lastBlock));
}
return blocks;
}
public static void RemoveIfEndingWith(this TextBlock textBlock, string text)
{
if (textBlock == null) return;
if (textBlock.Content.EndsWith(text))
{
textBlock.Content = textBlock.Content.Substring(
0, textBlock.Content.Length - text.Length);
}
}
public static string TrimIfEndingWith(this string content, string text)
{
if (content == null || !content.EndsWith(text)) return content;
return content.Substring(0, content.Length - text.Length);
}
public static void SkipIfNextIs(this string content, ref int pos, string text)
{
if (content == null || text == null) return;
if (content.Length < pos + text.Length) return;
var test = content.Substring(pos, text.Length);
if (test != text) return;
pos += text.Length;
}
public static string TrimLineIfOnlyHasWhitespace(this string text)
{
var pos = text.LastIndexOfAny(LineEndChars) + 1; //after \n or at start if not found
if (pos == text.Length) return text;
var startPos = pos;
text.EatWhitespace(ref pos);
if (pos == text.Length) return text.Substring(0, startPos);
return text;
}
public static List<TemplateBlock> CreateTemplateBlocks(this string content, List<StatementExprBlock> statementBlocks)
{
var blocks = new List<TemplateBlock>();
if (content.IsNullOrEmpty()) return blocks;
int pos;
var lastPos = 0;
while ((pos = content.IndexOf('@', lastPos)) != -1)
{
var contentBlock = content.Substring(lastPos, pos - lastPos);
var prevTextBlock = new TextBlock(contentBlock);
blocks.Add(prevTextBlock);
pos++; //@
if (content[pos] == '@')
{
prevTextBlock.Content += "@";
pos++;
}
else if (content[pos] == StatementPlaceholderChar)
{
pos++; //^
var index = content.GetNextAlphaNumericExpr(ref pos);
int statementNo;
if (int.TryParse(index, out statementNo))
{
var statementIndex = statementNo - 1;
if (statementIndex >= statementBlocks.Count)
throw new ArgumentOutOfRangeException(
"Expected < " + statementBlocks.Count + " but was " + statementIndex);
var statement = statementBlocks[statementIndex];
blocks.Add(statement);
}
//Strip everything but @^1 in <p>@^1</p>\n
prevTextBlock.RemoveIfEndingWith(UnwantedPrefix);
content.SkipIfNextIs(ref pos, UnwantedSuffix);
content.SkipIfNextIs(ref pos, "\r");
content.SkipIfNextIs(ref pos, "\n");
}
else
{
//ignore email addresses with @ in it
var charBeforeAtSymbol = content.SafePeekAt(pos - 3);
if (!charBeforeAtSymbol.IsAlphaNumeric())
{
var memberExpr = content.GetNextMemberExpr(ref pos);
if (memberExpr != null)
{
blocks.Add(new MemberExprBlock(memberExpr));
}
}
else
{
prevTextBlock.Content += "@";
}
}
lastPos = pos;
}
if (lastPos != content.Length)
{
var lastBlock = lastPos == 0 ? content : content.Substring(lastPos);
blocks.Add(new TextBlock(lastBlock));
}
return blocks;
}
public static StatementExprBlock GetNextStatementExpr(this string content, ref int fromPos)
{
var varExpr = content.GetNextAlphaNumericExpr(ref fromPos);
if (varExpr != null)
{
if (varExpr == "foreach" || varExpr == "if" || varExpr == "section")
{
var conditionEndPos = content.IndexOf(BeginStatementChar, fromPos);
if (conditionEndPos == -1)
throw new InvalidDataException(varExpr + " at index: " + fromPos);
var condition = content.Substring(fromPos, conditionEndPos - fromPos)
.Trim('(', ')', ' ');
fromPos = conditionEndPos;
var statement = content.EatStatementExpr(ref fromPos);
statement = statement.TrimLineIfOnlyHasWhitespace();
if (varExpr == "foreach")
return new ForEachStatementExprBlock(condition, statement);
if (varExpr == "if")
{
string elseStatement = null;
var nextWord = content.PeekWordAfterWhitespace(fromPos);
if (nextWord == "else")
{
//Skip past else
content.EatWhitespace(ref fromPos);
content.GetNextAlphaNumericExpr(ref fromPos);
elseStatement = content.EatStatementExpr(ref fromPos);
}
return new IfStatementExprBlock(condition, statement, elseStatement);
}
if (varExpr == "section")
return new SectionStatementExprBlock(condition, statement);
}
else if (varExpr == "var"
|| varExpr == "model"
|| varExpr == "inherits"
|| varExpr == "helper"
|| varExpr == "template" || varExpr == "Layout")
{
var pos = content.IndexOfAny(LineEndChars, fromPos);
var restOfLine = content.Substring(fromPos, pos - fromPos);
fromPos = pos;
if (varExpr == "var")
return new VarStatementExprBlock(varExpr, restOfLine);
return new DirectiveBlock(varExpr, restOfLine);
}
}
var nextToken = PeekAfterWhitespace(content, fromPos);
if (nextToken == BeginMethodChar)
{
var methodParamsExpr = content.EatMethodExpr(ref fromPos);
return new MethodStatementExprBlock(varExpr, methodParamsExpr, null);
}
return null;
}
public static char PeekAfterWhitespace(this string content, int index)
{
int c;
for (; index < content.Length; index++)
{
c = content[index];
if (c >= WhiteSpaceFlags.Length || !WhiteSpaceFlags[c])
{
break;
}
}
return index == content.Length ? '\0' : content[index];
}
public static string PeekWordAfterWhitespace(this string content, int index)
{
content.EatWhitespace(ref index);
var word = content.GetNextAlphaNumericExpr(ref index);
return word;
}
public static void EatWhitespace(this string content, ref int index)
{
int c;
for (; index < content.Length; index++)
{
c = content[index];
if (c >= WhiteSpaceFlags.Length || !WhiteSpaceFlags[c])
{
break;
}
}
}
public static void EatRestOfLine(this string content, ref int index)
{
int c;
for (; index < content.Length; index++)
{
c = content[index];
if (c >= WhiteSpaceFlags.Length || !WhiteSpaceFlags[c])
{
return;
}
if (c != '\r' && c != '\n') continue;
if (c == '\r') index++;
index++;
return;
}
}
private static string EatBlockExpr(this string content, ref int fromPos,
char beginChar, char endChar, bool allowDoubleEscaping)
{
content.EatWhitespace(ref fromPos);
if (content[fromPos++] != beginChar)
throw new InvalidDataException("Expected " + beginChar + " at: " + fromPos);
content.EatRestOfLine(ref fromPos);
var startPos = fromPos;
var hasDoubleEscaping = false;
var withinQuotes = false;
var endsToEat = 1;
while (fromPos < content.Length && endsToEat > 0)
{
var c = content[fromPos];
if (c == QuoteChar
&& content[fromPos - 1] != EscapeChar)
withinQuotes = !withinQuotes;
if (!withinQuotes)
{
var nextChar = content.SafePeekAt(fromPos);
var isEscaped = allowDoubleEscaping
&& (c == beginChar && nextChar == beginChar
|| c == endChar && nextChar == endChar);
if (isEscaped)
{
hasDoubleEscaping = true;
fromPos++;
}
else
{
if (c == beginChar)
endsToEat++;
if (c == endChar)
endsToEat--;
}
}
fromPos++;
}
var result = content.Substring(startPos, fromPos - startPos - 1);
if (!hasDoubleEscaping) return result;
return result.Replace(beginChar.ToString() + beginChar, beginChar.ToString())
.Replace(endChar.ToString() + endChar, endChar.ToString());
}
public static char SafePeekAt(this string content, int fromPos)
{
return fromPos + 1 >= content.Length ? '\0' : content[fromPos + 1];
}
public static bool IsAlphaNumeric(this char c)
{
return c < AlphaNumericFlags.Length && AlphaNumericFlags[c];
}
private static string EatStatementExpr(this string content, ref int fromPos)
{
return EatBlockExpr(content, ref fromPos, BeginStatementChar, EndStatementChar, true);
}
private static string EatMethodExpr(this string content, ref int fromPos)
{
return EatBlockExpr(content, ref fromPos, BeginMethodChar, EndMethodChar, false);
}
public static string GetNextAlphaNumericExpr(this string content, ref int fromPos)
{
var startPos = fromPos;
for (; fromPos < content.Length; fromPos++)
{
var exprChar = content[fromPos];
if (exprChar >= MemberExprFlags.Length) return null;
if (!MemberExprFlags[exprChar]) break;
}
return content.Substring(startPos, fromPos - startPos);
}
public static string GetNextMemberExpr(this string content, ref int fromPos)
{
var startPos = fromPos;
for (; fromPos < content.Length; fromPos++)
{
var exprChar = content[fromPos];
if (exprChar >= MemberExprFlags.Length) return null;
if (!MemberExprFlags[exprChar]) break;
}
if (fromPos == startPos) return null;
//Remove trailing '.' if any
var memberExpr = content.Substring(startPos, fromPos - startPos);
if (memberExpr[memberExpr.Length-1] == '.')
{
memberExpr = memberExpr.Substring(0, memberExpr.Length - 1);
fromPos--;
}
return memberExpr;
}
public static string RemoveAllWhiteSpace(this string content)
{
return content.RemoveCharFlags(WhiteSpaceFlags);
}
public static string GetVarName(this string memberExpr)
{
if (memberExpr == null) return null;
for (var i = 0; i < memberExpr.Length; i++)
{
var exprChar = memberExpr[i];
if (exprChar >= AlphaNumericFlags.Length) return null;
if (!AlphaNumericFlags[exprChar]) return memberExpr.Substring(0, i);
}
return memberExpr;
}
}
}