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comment readers should return undef values to report continuablility to 

the parent function
This commit is contained in:
Yuichi Nishiwaki 2014-06-25 18:06:48 +09:00
parent 6eec3629e9
commit a90330d3d9
1 changed files with 39 additions and 27 deletions
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66
src/read.c
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@ -34,13 +34,7 @@ skip(struct pic_port *port, char c)
static char
next(struct pic_port *port)
{
char c;
c = xfgetc(port->file);
// printf("%c", c);
return c;
return xfgetc(port->file);
}
static char
@ -56,11 +50,13 @@ peek(struct pic_port *port)
static pic_value
read_comment(pic_state *pic, struct pic_port *port, char c)
{
UNUSED(pic);
do {
c = next(port);
} while (! (c == EOF || c == '\n'));
return read(pic, port, c);
return pic_undef_value();
}
static pic_value
@ -68,6 +64,7 @@ read_block_comment(pic_state *pic, struct pic_port *port, char c)
{
char x, y;
UNUSED(pic);
UNUSED(c);
x = next(port);
@ -80,11 +77,18 @@ read_block_comment(pic_state *pic, struct pic_port *port, char c)
break;
}
}
if (y != EOF) {
y = next(port);
}
return read(pic, port, y);
return pic_undef_value();
}
static pic_value
read_datum_comment(pic_state *pic, struct pic_port *port, char c)
{
UNUSED(c);
read(pic, port, next(port));
return pic_undef_value();
}
static pic_value
@ -115,16 +119,6 @@ read_comma(pic_state *pic, struct pic_port *port, char c)
}
}
static pic_value
read_datum_comment(pic_state *pic, struct pic_port *port, char c)
{
UNUSED(c);
read(pic, port, next(port));
return read(pic, port, next(port));
}
static pic_value
read_symbol(pic_state *pic, struct pic_port *port, char c)
{
@ -491,7 +485,7 @@ read_dispatch(pic_state *pic, struct pic_port *port, char c)
}
static pic_value
read(pic_state *pic, struct pic_port *port, char c)
read_nullable(pic_state *pic, struct pic_port *port, char c)
{
c = skip(port, c);
@ -526,6 +520,28 @@ read(pic_state *pic, struct pic_port *port, char c)
}
}
static pic_value
read(pic_state *pic, struct pic_port *port, char c)
{
pic_value val;
retry:
c = skip(port, c);
if (c == EOF) {
return pic_eof_object();
}
val = read_nullable(pic, port, c);
if (pic_undef_p(val)) {
c = next(port);
goto retry;
}
return val;
}
pic_value
pic_read(pic_state *pic, struct pic_port *port)
{
@ -533,10 +549,6 @@ pic_read(pic_state *pic, struct pic_port *port)
c = next(port);
if (c == EOF) {
return pic_eof_object();
}
return read(pic, port, c);
}