/// <summary>
/// indirect way of add production by string, format string as:
/// Pre ->|:|| Suf0 Suf1 ... [@SemantDelegateName[$attr]]
/// like this:
/// E -> F G
/// or like this:
/// E -> E add E @SemantAdd
/// or like this:
/// E | E opt E @SementOpt
/// or like this:
/// E : Delimiter E Delimiter @Semant
/// or with attr in string (attr will be string type), just add $attr directly behand @SemantDelegateName
/// E -> E F @Semant$deal
/// </summary>
/// <param name="productSentence">formated string</param>
/// <exception cref="ProductSentenceException">if productSentence is illeagal</exception>
public void AddProductionByString(string productSentence)
{
string[] vs = productSentence.Split(" ");
if (vs[1] != "->" && vs[1] != "|" && vs[1] != ":")
{
throw new ProductSentenceException(productSentence,
"ProductSentence Error: sentence \"" + productSentence + "\" is illeagal.");
}
int i = vs.Length - 1;
SemantDelegate semantDelegate = null;
object attr = null;
if (vs[i].StartsWith('@'))
{
string[] s = vs[i].TrimStart('@').Split("$", 2);
semantDelegate = SemantDelegateTable[s[0]];
if (s[1].Length > 0)
{
attr = s[1];
}
i--;
}
string[] sufs = new string[i];
for (int j = 2; j <= i; j++)
{
sufs[j - 2] = vs[j];
}
Production production = new Production(vs[0], sufs, semantDelegate, attr);
AddProduction(production);
}
/// <summary>
/// the production of grammar
/// </summary>
/// <param name="pre">antecedent</param>
/// <param name="sufs">seccedents</param>
/// <param name="semantDelegate">delegate for semanting</param>
/// <param name="attr">attr for advansing usage</param>
public Production(string pre, string[] sufs, SemantDelegate semantDelegate, object attr)
{
Pre = pre;
Sufs = sufs;
SemantDelegate = semantDelegate;
Attr = attr;
}
/// <summary> /// part of indirect way of add production, add the SemantDelegate to table. /// </summary> /// <param name="name">name of delegate method</param> /// <param name="semantDelegate">the delegate method</param> /// <exception cref="ProductSentenceException">if ProductSentence is illeagal</exception> public void AddSemantDelegateTable(string name, SemantDelegate semantDelegate) => SemantDelegateTable.Add(name, semantDelegate);