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- completed parser - accepts full language (modulo bugs)

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SVN=126551
This commit is contained in:
Robert Griesemer 2008-07-09 14:01:17 -07:00
parent 7b454bb1d9
commit cab94922e7
1 changed files with 63 additions and 2 deletions
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65
usr/gri/src/parser.go
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@ -692,6 +692,67 @@ func (P *Parser) ParseSwitchStat() {
}
func (P *Parser) ParseCommCase() {
P.Trace("CommCase");
if P.tok == Scanner.CASE {
P.Next();
if P.tok == Scanner.GTR {
// send
P.Next();
P.ParseExpression();
P.Expect(Scanner.EQL);
P.ParseExpression();
} else {
// receive
if P.tok != Scanner.LSS {
P.ParseIdent();
P.Expect(Scanner.ASSIGN);
}
P.Expect(Scanner.LSS);
P.ParseExpression();
}
} else {
P.Expect(Scanner.DEFAULT);
}
P.Expect(Scanner.COLON);
P.Ecart();
}
func (P *Parser) ParseCommClause() {
P.Trace("CommClause");
P.ParseCommCase();
if P.tok != Scanner.CASE && P.tok != Scanner.DEFAULT && P.tok != Scanner.RBRACE {
P.ParseStatementList();
P.Optional(Scanner.SEMICOLON);
}
P.Ecart();
}
func (P *Parser) ParseRangeStat() bool {
P.Trace("RangeStat");
P.Expect(Scanner.RANGE);
P.ParseIdentList();
P.Expect(Scanner.DEFINE);
P.ParseExpression();
P.ParseBlock();
P.Ecart();
}
func (P *Parser) ParseSelectStat() bool {
P.Trace("SelectStat");
P.Expect(Scanner.SELECT);
P.Expect(Scanner.LBRACE);
for P.tok != Scanner.RBRACE {
P.ParseCommClause();
}
P.Next();
P.Ecart();
}
func (P *Parser) TryStatement() bool {
P.Trace("Statement (try)");
switch P.tok {
@ -724,9 +785,9 @@ func (P *Parser) TryStatement() bool {
case Scanner.SWITCH:
P.ParseSwitchStat();
case Scanner.RANGE:
panic "range statement";
P.ParseRangeStat();
case Scanner.SELECT:
panic "select statement";
P.ParseSelectStat();
default:
// no statement found
P.Ecart();