internal static bool CanParse(Parser p)
{
return p.NextSymbolsAre (TokenType.BeginCommand, TokenType.If);
}
internal static bool CanParse(Parser p)
{
return p.NextSymbolsAre (TokenType.BeginCommand, TokenType.Text) ||
p.NextSymbolsAre (TokenType.BeginCommand, TokenType.Identifier);
}
internal IfStatement(ParseNode parent, Parser p)
: base(parent, p)
{
// All if statements begin with "<<if EXPRESSION>>", so parse that
Clause primaryClause = new Clause();
p.ExpectSymbol(TokenType.BeginCommand);
p.ExpectSymbol(TokenType.If);
primaryClause.expression = Expression.Parse(this, p);
p.ExpectSymbol(TokenType.EndCommand);
// Read the statements for this clause until we hit an <<endif or <<else
// (which could be an "<<else>>" or an "<<else if"
var statements = new List<Statement>();
while (p.NextSymbolsAre(TokenType.BeginCommand, TokenType.EndIf) == false &&
p.NextSymbolsAre(TokenType.BeginCommand, TokenType.Else) == false &&
p.NextSymbolsAre(TokenType.BeginCommand, TokenType.ElseIf) == false) {
statements.Add(new Statement(this, p));
// Ignore any dedents
while (p.NextSymbolIs(TokenType.Dedent)) {
p.ExpectSymbol(TokenType.Dedent);
}
}
primaryClause.statements = statements;
clauses.Add(primaryClause);
// Handle as many <<elseif clauses as we find
while (p.NextSymbolsAre(TokenType.BeginCommand, TokenType.ElseIf)) {
var elseIfClause = new Clause();
// Parse the syntax for this clause's condition
p.ExpectSymbol(TokenType.BeginCommand);
p.ExpectSymbol(TokenType.ElseIf);
elseIfClause.expression = Expression.Parse(this, p);
p.ExpectSymbol(TokenType.EndCommand);
// Read statements until we hit an <<endif, <<else or another <<elseif
var clauseStatements = new List<Statement>();
while (p.NextSymbolsAre(TokenType.BeginCommand, TokenType.EndIf) == false &&
p.NextSymbolsAre(TokenType.BeginCommand, TokenType.Else) == false &&
p.NextSymbolsAre(TokenType.BeginCommand, TokenType.ElseIf) == false) {
clauseStatements.Add(new Statement(this, p));
// Ignore any dedents
while (p.NextSymbolIs(TokenType.Dedent)) {
p.ExpectSymbol(TokenType.Dedent);
}
}
elseIfClause.statements = clauseStatements;
clauses.Add(elseIfClause);
}
// Handle <<else>> if we have it
if (p.NextSymbolsAre(TokenType.BeginCommand, TokenType.Else, TokenType.EndCommand)) {
// parse the syntax (no expression this time, just "<<else>>"
p.ExpectSymbol(TokenType.BeginCommand);
p.ExpectSymbol(TokenType.Else);
p.ExpectSymbol(TokenType.EndCommand);
// and parse statements until we hit "<<endif"
var elseClause = new Clause();
var clauseStatements = new List<Statement>();
while (p.NextSymbolsAre(TokenType.BeginCommand, TokenType.EndIf) == false) {
clauseStatements.Add(new Statement(this, p));
}
elseClause.statements = clauseStatements;
this.clauses.Add(elseClause);
// Ignore any dedents
while (p.NextSymbolIs(TokenType.Dedent)) {
p.ExpectSymbol(TokenType.Dedent);
}
}
// Finish up by reading the <<endif>>
p.ExpectSymbol(TokenType.BeginCommand);
p.ExpectSymbol(TokenType.EndIf);
p.ExpectSymbol(TokenType.EndCommand);
}
internal ShortcutOption(int optionIndex, ParseNode parent, Parser p)
: base(parent, p)
{
p.ExpectSymbol(TokenType.ShortcutOption);
label = p.ExpectSymbol(TokenType.Text).value as string;
// Parse the conditional ("<<if $foo>>") if it's there
if (p.NextSymbolsAre(TokenType.BeginCommand, TokenType.If)) {
p.ExpectSymbol(TokenType.BeginCommand);
p.ExpectSymbol(TokenType.If);
condition = Expression.Parse(this, p);
p.ExpectSymbol(TokenType.EndCommand);
}
// Parse the statements belonging to this option if it has any
if (p.NextSymbolIs(TokenType.Indent)) {
p.ExpectSymbol(TokenType.Indent);
optionNode = new Node(NodeParent().name + "." + optionIndex, this, p);
p.ExpectSymbol(TokenType.Dedent);
}
}
