Implement pdf text quote operators (' and ")

[zacii7]

Single- and double quote operators are currently missing in pdfio

as per pdf specs,

(sometext)' is equivalent to T* (sometext)Tj

and

2 1 (sometext)" is equivalent to 2 Tw 1 Tc (sometext)'

[michaelrsweet]

Hmm, will consider this for a future feature release after 1.0. There is still a lot of work to do with text support...

[zacii7]

Fair enough

I figured the implementation should be fairly straight forward given the routines you already have in place, so it shouldn't add too much maintenance burden. And they can't really be added externally, because they rely on the internal write_string function.

  bool pdfioContentTextNewLineShow(pdfio_stream_t *st,bool unicode,char *s) {
    bool newline = false;
    if (!write_string(st, unicode, s, &newline))
      return (false);
    return(pdfioStreamPuts(st, "'\n"));
  }

  bool pdfioContentTextNewLineShowSpaced(pdfio_stream_t *st,double ws,double cs,bool unicode,char *s) {
    bool newline = false;

    if (!pdfioStreamPrintf(st, "%g %g", ws,cs)) {
      return (false);
    }

    if (!write_string(st, unicode, s, &newline))
      return (false);
    return(pdfioStreamPuts(st, "\"\n"));
  }

[michaelrsweet]

Opted to add a single set of APIs to cover both operators:

extern bool     pdfioContentTextNewLineShow(pdfio_stream_t *st, double ws, double cs, bool unicode, const char *s) _PDFIO_PUBLIC;
extern bool     pdfioContentTextNewLineShowf(pdfio_stream_t *st, double ws, double cs, bool unicode, const char *format, ...) _PDFIO_PUBLIC _PDFIO_FORMAT(5,6);

[master 7ff051f] Add pdfioContentTextNewLineShow/f functions (Issue #24)