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TemplateLexer.cs
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TemplateLexer.cs
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using System;
using System.Linq;
using System.Collections.Generic;
class TemplateLexer {
private List<string> toks = new List<string>(){"", ""};
private int index = 0;
private string contents;
private string currentChar = "";
public TemplateLexer(string str)
{
contents = str;
currentChar = index < contents.Length ? contents[index].ToString() : "";
}
private void Adavnce()
{
index += 1;
currentChar = index < contents.Length ? contents[index].ToString() : "";
}
private void Revert(int num)
{
index = num;
currentChar = index < contents.Length ? contents[index].ToString() : "";
}
private bool Matches(string matching)
{
var frozenIndex = index;
var matchIndex = 0;
var matchLength = frozenIndex + matching.Length;
while(index < matchLength)
{
if(matching[matchIndex].ToString() == currentChar.ToString()) this.Adavnce();
else
{
this.Revert(frozenIndex);
return false;
}
matchIndex += 1;
}
this.Revert(frozenIndex);
return true;
}
private void AddToken()
{
toks.Add("");
}
private void BeginningToken(string str)
{
AddToken();
foreach(var _ in str) this.Adavnce();
toks[toks.Count - 1] += str;
}
private void EndingToken(string str)
{
toks[toks.Count - 1] += str;
foreach(var _ in str) this.Adavnce();
AddToken();
}
public void SkipString()
{
var str = "";
var esacapeChar = false;
var escapeChars = new Dictionary<string, string>(){
{"n", "\n"},
{"t", "\t"}
};
this.Adavnce();
while (currentChar != Token.TT_END && (currentChar != "\"" || esacapeChar))
{
if(esacapeChar)
{
str += escapeChars[currentChar].ToString();
esacapeChar = false;
} else
{
if(currentChar == "\\")
{
esacapeChar = true;
} else
{
str += currentChar.ToString();
}
}
this.Adavnce();
}
this.Adavnce();
toks[toks.Count - 1] += "\"" + str + "\"";
}
private List<TemplateToken> ToTemplateTokens(string fn, List<string> toks)
{
var templateToks = new List<TemplateToken>();
var pos = new Position(fn, contents);
pos.Advance();
foreach(var tok in toks) {
var posStart = pos.Copy();
if (tok.StartsWith("{{") && tok.EndsWith("}}"))
{
pos.Advance();
pos.Advance();
var subStr = tok.Substring(2);
var finalStr = subStr.Substring(0, subStr.Length-2);
var toksForExprParser = new Lexer("<module>", finalStr, pos).Lex();
var node = new Parser(toksForExprParser).Parse();
pos.Advance();
pos.Advance();
var currentPos = pos.Copy();
var renderTok = new RenderToken(node, posStart, currentPos);
templateToks.Add(renderTok);
} else if (tok.StartsWith("{%") && (tok.EndsWith("%}") || tok.EndsWith("-%}")))
{
pos.Advance();
pos.Advance();
var subStr = tok.Substring(2);
var finalStr = subStr.Substring(0, subStr.Length-2);
var toksForExprParser = new Lexer("<module>", finalStr, pos).Lex();
var beginSmntCue = new Parser(toksForExprParser).ParseCue();
pos.Advance();
pos.Advance();
templateToks.Add(beginSmntCue);
} else {
foreach(var ch in tok) pos.Advance(ch.ToString());
var currentPos = pos.Copy();
templateToks.Add(new RenderToken(new StrNode(tok, posStart, currentPos), posStart, currentPos));
}
}
return templateToks;
}
public List<TemplateToken> Lex(string fn)
{
while (currentChar != "")
{
if (this.Matches("{{")) this.BeginningToken("{{");
else if (this.Matches("}}")) this.EndingToken("}}");
else if (this.Matches("{%"))
{
this.BeginningToken("{%");
if(currentChar == "-" || currentChar == "~")
{
var pred = GetPred(() => currentChar == "-");
var trimChars = currentChar == "-" ? new[]{'\n', '\r', '\t', ' '} : new[]{'\t', ' '};
var mainChar = currentChar[0];
this.Adavnce();
while(new List<char>(toks[toks.Count - 2]).All(pred) && toks[toks.Count - 2] != "")
{
toks.RemoveAt(toks.Count - 2);
}
toks[toks.Count - 2] = mainChar == '-' ? toks[toks.Count - 2].TrimEnd() : toks[toks.Count - 2].TrimEnd(new[]{' ', '\t'});
}
}
else if (this.Matches("-%}")) this.EndingToken("-%}");
else if (this.Matches("~%}")) this.EndingToken("~%}");
else if (this.Matches("%}")) this.EndingToken("%}");
else if (currentChar == "\"") this.SkipString();
else
{
toks[toks.Count - 1] += currentChar;
this.Adavnce();
}
}
var i = 0;
while(i < toks.Count)
{
var tok = toks[i];
if(tok.EndsWith("-%}") || tok.EndsWith("~%}"))
{
var pred = GetPred(() => tok.EndsWith("-%}"));
var mainChar = tok[0];
toks[i] = tok.Substring(0, tok.Length-3) + "%}";
var index = i+1;
while(index < toks.Count && toks[index].All(pred))
{
toks[index] = "";
i++;
index++;
}
if(index < toks.Count) toks[index] = mainChar == '-' ? toks[index].TrimStart() : toks[index].TrimStart(new[]{' ', '\t'});
}
i++;
}
toks = toks.Where(a => a != "").ToList();
return this.ToTemplateTokens(fn, toks);
}
Func<char, bool> GetPred(Func<bool> p)
{
return p()
? (Func<char, bool>)(x => System.Char.IsWhiteSpace(x))
: (Func<char, bool>)(x => System.Char.IsWhiteSpace(x) && (x != '\n'));
}
}