NAME ^

src/pmc/parrotio.pmc - Parrot IO

DESCRIPTION ^

These are the vtable functions for Parrot IO.

Methods ^

METHOD INTVAL say(STRING *s)

Print the string with an appended newline to SELF or to stdout if used as a class method.

METHOD PMC *open(STRING *file, STRING *mode, STRING *layer)

Opens the file with the given mode, using the given IO layer.

METHOD INTVAL set_readline_interactive(INTVAL)

Sets readline interactive mode to the given value, if PARROT_HAS_READLINE is defined, that is, if the readline library is available. The return values are:

METHOD PMC *readline(STRING *prompt)

Reads a line from the given PIO. If readline is interactive and a prompt is not empty, it will be displayed. The interactive feature is not available with the readline opcode (which will be removed anyway). Interactive mode adds non-empty lines to the readline history.

Returns the line without the newline in a String PMC. If ^D/eof occurred, this will return a Null PMC.

SYNOPSIS

      pio = getstdin
      $I0 = pio.'set_readline_interactive'(1)
      if $I0 >= 0 goto loop
      printerr "set_readline_interactive failed: "
      ...
  loop:
      $P1 = pio.'readline'('hello polly> ')
      if null $P1  goto ex
      ..
      goto loop
  ex:
METHOD STRING* slurp(STRING* name);

Slurp an (existing, disc) file named name into a STRING result.

Please note that this method isn't catching any failures yet.

Usage as class method:

  .local pmc cl
  cl = getclass 'ParrotIO'
  $S0 = cl.'slurp'('the_file')
The file will be opened, read, and closed.

Or with an openend file:

  pio = open 'the_file', '<'
  $S0 = pio.'slurp'('')
This does not close the file.

void class_init()

Class initialization.

METHOD INTVAL eof()

Returns true or false according to the end of file state of the object.

METHOD void flush()

Flushes pending writes.

METHOD INTVAL setbuf(INTVAL)

XXX TBD

METHOD INTVAL setlinebuf()

XXX TBD

void init()

Initializes the IO PMC.

void destroy()

Destroys the IO PMC, flushing and closing as necessary.

PMC *clone()

Clones the IO PMC.

For now, both PMCs refer to the same ParrotIO object. If we have different IO layers, we might copy data and struct_val.

INTVAL get_bool()

Returns whether at EOF or not.

STRING *get_string_keyed_int(INTVAL n)

Returns the name of the nth layer. n >= 0 returns layer names up from the bottom. If n is negative, returns layer names from top down. For non-existent layers, returns an empty string.

void push_string(STRING *value)

Pushes the layer name value onto the PIO's layer stack.

STRING *pop_string()

Pops a layer off the PIO's layer stack and returns its name.

HISTORY ^

Initial version by leo 2003/06/23.


 parrot