PluralFormsNode EqualityExpression()
{
PluralFormsNode p = RelationalExpression();
if (p == null)
{
return(null);
}
PluralFormsNode n = p;
if (Token.TokenType == PluralFormsToken.Type.Equal || Token.TokenType == PluralFormsToken.Type.NotEqual)
{
PluralFormsNode qn = new PluralFormsNode(new PluralFormsToken(Token));
if (!NextToken())
{
return(null);
}
p = RelationalExpression();
if (p == null)
{
return(null);
}
qn.SetNode(1, p);
qn.SetNode(0, n);
return(qn);
}
return(n);
}
PluralFormsNode MultiplicativeExpression()
{
PluralFormsNode p = PmExpression();
if (p == null)
{
return(null);
}
PluralFormsNode n = p;
if (Token.TokenType == PluralFormsToken.Type.Reminder)
{
PluralFormsNode qn = new PluralFormsNode(new PluralFormsToken(Token));
if (!NextToken())
{
return(null);
}
p = PmExpression();
if (p == null)
{
return(null);
}
qn.SetNode(1, p);
qn.SetNode(0, n);
return(qn);
}
return(n);
}
PluralFormsNode RelationalExpression()
{
PluralFormsNode p = MultiplicativeExpression();
if (p == null)
{
return(null);
}
PluralFormsNode n = p;
if (Token.TokenType == PluralFormsToken.Type.Greater ||
Token.TokenType == PluralFormsToken.Type.Less ||
Token.TokenType == PluralFormsToken.Type.GreaterOrEqual ||
Token.TokenType == PluralFormsToken.Type.LessOrEqual)
{
PluralFormsNode qn = new PluralFormsNode(new PluralFormsToken(Token));
if (!NextToken())
{
return(null);
}
p = MultiplicativeExpression();
if (p == null)
{
return(null);
}
qn.SetNode(1, p);
qn.SetNode(0, n);
return(qn);
}
return(n);
}
public void SetNode(int i, PluralFormsNode n)
{
if (i >= 0 && i <= 2)
{
nodes[i] = n;
}
}
public PluralFormsNode ReleaseNode(int i)
{
PluralFormsNode node = nodes[i];
nodes[i] = null;
return(node);
}
PluralFormsNode ParsePlural()
{
PluralFormsNode p = Expression();
if (p == null)
{
return(null);
}
if (Token.TokenType != PluralFormsToken.Type.Semicolon)
{
return(null);
}
return(p);
}
PluralFormsNode Expression()
{
PluralFormsNode p = LogicalOrExpression();
if (p == null)
{
return(null);
}
PluralFormsNode n = p;
if (Token.TokenType == PluralFormsToken.Type.Question)
{
PluralFormsNode qn = new PluralFormsNode(new PluralFormsToken(Token));
if (!NextToken())
{
return(null);
}
p = Expression();
if (p == null)
{
return(null);
}
qn.SetNode(1, p);
if (Token.TokenType != PluralFormsToken.Type.Colon)
{
return(null);
}
if (!NextToken())
{
return(null);
}
p = Expression();
if (p == null)
{
return(null);
}
qn.SetNode(2, p);
qn.SetNode(0, n);
return(qn);
}
return(n);
}
PluralFormsNode LogicalAndExpression()
{
PluralFormsNode p = EqualityExpression();
if (p == null)
{
return(null);
}
PluralFormsNode ln = p; // left
if (Token.TokenType == PluralFormsToken.Type.LogicalAnd)
{
PluralFormsNode un = new PluralFormsNode(new PluralFormsToken(Token)); // up
if (!NextToken())
{
return(null);
}
p = LogicalAndExpression();
if (p == null)
{
return(null);
}
PluralFormsNode rn = p; // right
if (rn.Token.TokenType == PluralFormsToken.Type.LogicalAnd)
{
// transform 1 && (2 && 3) -> (1 && 2) && 3
// u r
// l r -> u 3
// 2 3 l 2
un.SetNode(0, ln);
un.SetNode(1, rn.ReleaseNode(0));
rn.SetNode(0, un);
return(rn);
}
un.SetNode(0, ln);
un.SetNode(1, rn);
return(un);
}
return(ln);
}
PluralFormsNode PmExpression()
{
PluralFormsNode n;
if (Token.TokenType == PluralFormsToken.Type.N || Token.TokenType == PluralFormsToken.Type.Number)
{
n = new PluralFormsNode(new PluralFormsToken(Token));
if (!NextToken())
{
return(null);
}
}
else if (Token.TokenType == PluralFormsToken.Type.LeftBracket)
{
if (!NextToken())
{
return(null);
}
PluralFormsNode p = Expression();
if (p == null)
{
return(null);
}
n = p;
if (Token.TokenType != PluralFormsToken.Type.RightBracket)
{
return(null);
}
if (!NextToken())
{
return(null);
}
}
else
{
return(null);
}
return(n);
}
PluralFormsNode LogicalOrExpression()
{
PluralFormsNode p = LogicalAndExpression();
if (p == null)
{
return(null);
}
PluralFormsNode ln = p;
if (Token.TokenType == PluralFormsToken.Type.LogicalOr)
{
PluralFormsNode un = new PluralFormsNode(new PluralFormsToken(Token));
if (!NextToken())
{
return(null);
}
p = LogicalOrExpression();
if (p == null)
{
return(null);
}
PluralFormsNode rn = p; // right
if (rn.Token.TokenType == PluralFormsToken.Type.LogicalOr)
{
// see logicalAndExpression comment
un.SetNode(0, ln);
un.SetNode(1, rn.ReleaseNode(0));
rn.SetNode(0, un);
return(rn);
}
un.SetNode(0, ln);
un.SetNode(1, rn);
return(un);
}
return(ln);
}
public void SetNode (int i, PluralFormsNode n)
{
if (i >= 0 && i <= 2)
nodes[i] = n;
}
public void Init (int nplurals, PluralFormsNode plural)
{
this.nplurals = nplurals;
this.plural = plural;
}
PluralFormsNode Expression ()
{
PluralFormsNode p = LogicalOrExpression ();
if (p == null)
return null;
PluralFormsNode n = p;
if (Token.TokenType == PluralFormsToken.Type.Question)
{
PluralFormsNode qn = new PluralFormsNode (new PluralFormsToken (Token));
if (! NextToken ())
{
return null;
}
p = Expression ();
if (p == null)
{
return null;
}
qn.SetNode (1, p);
if (Token.TokenType != PluralFormsToken.Type.Colon)
{
return null;
}
if (! NextToken ())
{
return null;
}
p = Expression ();
if (p == null)
{
return null;
}
qn.SetNode (2, p);
qn.SetNode (0, n);
return qn;
}
return n;
}
PluralFormsNode LogicalOrExpression ()
{
PluralFormsNode p = LogicalAndExpression ();
if (p == null)
return null;
PluralFormsNode ln = p;
if (Token.TokenType == PluralFormsToken.Type.LogicalOr)
{
PluralFormsNode un = new PluralFormsNode (new PluralFormsToken(Token));
if (! NextToken ())
{
return null;
}
p = LogicalOrExpression ();
if (p == null)
{
return null;
}
PluralFormsNode rn = p; // right
if (rn.Token.TokenType == PluralFormsToken.Type.LogicalOr)
{
// see logicalAndExpression comment
un.SetNode (0, ln);
un.SetNode (1, rn.ReleaseNode (0));
rn.SetNode (0, un);
return rn;
}
un.SetNode (0, ln);
un.SetNode (1, rn);
return un;
}
return ln;
}
PluralFormsNode LogicalAndExpression ()
{
PluralFormsNode p = EqualityExpression ();
if (p == null)
return null;
PluralFormsNode ln = p; // left
if (Token.TokenType == PluralFormsToken.Type.LogicalAnd)
{
PluralFormsNode un = new PluralFormsNode (new PluralFormsToken(Token)); // up
if (! NextToken ())
{
return null;
}
p = LogicalAndExpression ();
if (p == null)
{
return null;
}
PluralFormsNode rn = p; // right
if (rn.Token.TokenType == PluralFormsToken.Type.LogicalAnd)
{
// transform 1 && (2 && 3) -> (1 && 2) && 3
// u r
// l r -> u 3
// 2 3 l 2
un.SetNode (0, ln);
un.SetNode (1, rn.ReleaseNode (0));
rn.SetNode (0, un);
return rn;
}
un.SetNode (0, ln);
un.SetNode (1, rn);
return un;
}
return ln;
}
PluralFormsNode EqualityExpression ()
{
PluralFormsNode p = RelationalExpression ();
if (p == null)
return null;
PluralFormsNode n = p;
if (Token.TokenType == PluralFormsToken.Type.Equal || Token.TokenType == PluralFormsToken.Type.NotEqual)
{
PluralFormsNode qn = new PluralFormsNode (new PluralFormsToken(Token));
if (! NextToken ())
{
return null;
}
p = RelationalExpression ();
if (p == null)
{
return null;
}
qn.SetNode (1, p);
qn.SetNode (0, n);
return qn;
}
return n;
}
public bool Parse(PluralFormsCalculator calculator)
{
if (Token.TokenType != PluralFormsToken.Type.Nplurals)
{
return(false);
}
if (!NextToken())
{
return(false);
}
if (Token.TokenType != PluralFormsToken.Type.Assign)
{
return(false);
}
if (!NextToken())
{
return(false);
}
if (Token.TokenType != PluralFormsToken.Type.Number)
{
return(false);
}
int nplurals = Token.Number;
if (!NextToken())
{
return(false);
}
if (Token.TokenType != PluralFormsToken.Type.Semicolon)
{
return(false);
}
if (!NextToken())
{
return(false);
}
if (Token.TokenType != PluralFormsToken.Type.Plural)
{
return(false);
}
if (!NextToken())
{
return(false);
}
if (Token.TokenType != PluralFormsToken.Type.Assign)
{
return(false);
}
if (!NextToken())
{
return(false);
}
PluralFormsNode plural = ParsePlural();
if (plural == null)
{
return(false);
}
if (Token.TokenType != PluralFormsToken.Type.Semicolon)
{
return(false);
}
if (!NextToken())
{
return(false);
}
if (Token.TokenType != PluralFormsToken.Type.Eof)
{
return(false);
}
calculator.Init(nplurals, plural);
return(true);
}
PluralFormsNode MultiplicativeExpression ()
{
PluralFormsNode p = PmExpression ();
if (p == null)
{
return null;
}
PluralFormsNode n = p;
if (Token.TokenType == PluralFormsToken.Type.Reminder)
{
PluralFormsNode qn = new PluralFormsNode (new PluralFormsToken(Token));
if (! NextToken())
{
return null;
}
p = PmExpression ();
if (p == null)
{
return null;
}
qn.SetNode (1, p);
qn.SetNode (0, n);
return qn;
}
return n;
}
public void Init(int nplurals, PluralFormsNode plural)
{
this.nplurals = nplurals;
this.plural = plural;
}
public PluralFormsCalculator()
{
nplurals = 0;
plural = null;
}
public PluralFormsCalculator ()
{
nplurals = 0;
plural = null;
}
PluralFormsNode RelationalExpression ()
{
PluralFormsNode p = MultiplicativeExpression ();
if (p == null)
return null;
PluralFormsNode n = p;
if (Token.TokenType == PluralFormsToken.Type.Greater
|| Token.TokenType == PluralFormsToken.Type.Less
|| Token.TokenType == PluralFormsToken.Type.GreaterOrEqual
|| Token.TokenType == PluralFormsToken.Type.LessOrEqual)
{
PluralFormsNode qn = new PluralFormsNode (new PluralFormsToken(Token));
if (! NextToken ()) {
return null;
}
p = MultiplicativeExpression ();
if (p == null) {
return null;
}
qn.SetNode (1, p);
qn.SetNode (0, n);
return qn;
}
return n;
}
PluralFormsNode PmExpression ()
{
PluralFormsNode n;
if (Token.TokenType == PluralFormsToken.Type.N || Token.TokenType == PluralFormsToken.Type.Number) {
n = new PluralFormsNode (new PluralFormsToken(Token));
if (! NextToken ()) {
return null;
}
} else if (Token.TokenType == PluralFormsToken.Type.LeftBracket) {
if (! NextToken ()) {
return null;
}
PluralFormsNode p = Expression ();
if (p == null) {
return null;
}
n = p;
if (Token.TokenType != PluralFormsToken.Type.RightBracket) {
return null;
}
if (! NextToken ()) {
return null;
}
} else {
return null;
}
return n;
}
