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Sourcecode: halibut version File versions

bk_text.c

/*
 * text backend for Halibut
 */

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include "halibut.h"

typedef enum { LEFT, LEFTPLUS, CENTRE } alignment;
typedef struct {
    alignment align;
    int just_numbers;
    wchar_t *underline;
    wchar_t *number_suffix;
} alignstruct;

typedef struct {
    int indent, indent_code;
    int listindentbefore, listindentafter;
    int width;
    alignstruct atitle, achapter, *asect;
    int nasect;
    int include_version_id;
    int indent_preambles;
    int charset;
    word bullet;
    wchar_t *lquote, *rquote, *rule;
    char *filename;
    wchar_t *listsuffix, *startemph, *endemph;
} textconfig;

typedef struct {
    FILE *fp;
    int charset;
    charset_state state;
} textfile;

static void text_heading(textfile *, word *, word *, word *, alignstruct,
                   int, int, textconfig *);
static void text_rule(textfile *, int, int, textconfig *);
static void text_para(textfile *, word *, wchar_t *, word *, int, int, int,
                  textconfig *);
static void text_codepara(textfile *, word *, int, int);
static void text_versionid(textfile *, word *, textconfig *);

static void text_output(textfile *, const wchar_t *);
static void text_output_many(textfile *, int, wchar_t);

static alignment utoalign(wchar_t *p) {
    if (!ustricmp(p, L"centre") || !ustricmp(p, L"center"))
      return CENTRE;
    if (!ustricmp(p, L"leftplus"))
      return LEFTPLUS;
    return LEFT;
}

static textconfig text_configure(paragraph *source) {
    textconfig ret;
    paragraph *p;
    int n;

    /*
     * Non-negotiables.
     */
    ret.bullet.next = NULL;
    ret.bullet.alt = NULL;
    ret.bullet.type = word_Normal;
    ret.atitle.just_numbers = FALSE;   /* ignored */

    /*
     * Defaults.
     */
    ret.indent = 7;
    ret.indent_code = 2;
    ret.listindentbefore = 1;
    ret.listindentafter = 3;
    ret.width = 68;
    ret.atitle.align = CENTRE;
    ret.atitle.underline = L"\x2550\0=\0\0";
    ret.achapter.align = LEFT;
    ret.achapter.just_numbers = FALSE;
    ret.achapter.number_suffix = L": ";
    ret.achapter.underline = L"\x203E\0-\0\0";
    ret.nasect = 1;
    ret.asect = snewn(ret.nasect, alignstruct);
    ret.asect[0].align = LEFTPLUS;
    ret.asect[0].just_numbers = TRUE;
    ret.asect[0].number_suffix = L" ";
    ret.asect[0].underline = L"\0";
    ret.include_version_id = TRUE;
    ret.indent_preambles = FALSE;
    ret.bullet.text = L"\x2022\0-\0\0";
    ret.rule = L"\x2500\0-\0\0";
    ret.filename = dupstr("output.txt");
    ret.startemph = L"_\0_\0\0";
    ret.endemph = uadv(ret.startemph);
    ret.listsuffix = L".";
    ret.charset = CS_ASCII;
    /*
     * Default quote characters are Unicode matched single quotes,
     * falling back to the TeXlike `'.
     */
    ret.lquote = L"\x2018\0\x2019\0`\0'\0\0";
    ret.rquote = uadv(ret.lquote);

    /*
     * Two-pass configuration so that we can pick up global config
     * (e.g. `quotes') before having it overridden by specific
     * config (`text-quotes'), irrespective of the order in which
     * they occur.
     */
    for (p = source; p; p = p->next) {
      if (p->type == para_Config) {
          if (!ustricmp(p->keyword, L"quotes")) {
            if (*uadv(p->keyword) && *uadv(uadv(p->keyword))) {
                ret.lquote = uadv(p->keyword);
                ret.rquote = uadv(ret.lquote);
            }
          }
      }
    }

    for (p = source; p; p = p->next) {
      if (p->type == para_Config) {
          if (!ustricmp(p->keyword, L"text-indent")) {
            ret.indent = utoi(uadv(p->keyword));
          } else if (!ustricmp(p->keyword, L"text-charset")) {
            ret.charset = charset_from_ustr(&p->fpos, uadv(p->keyword));
          } else if (!ustricmp(p->keyword, L"text-filename")) {
            sfree(ret.filename);
            ret.filename = dupstr(adv(p->origkeyword));
          } else if (!ustricmp(p->keyword, L"text-indent-code")) {
            ret.indent_code = utoi(uadv(p->keyword));
          } else if (!ustricmp(p->keyword, L"text-width")) {
            ret.width = utoi(uadv(p->keyword));
          } else if (!ustricmp(p->keyword, L"text-list-indent")) {
            ret.listindentbefore = utoi(uadv(p->keyword));
          } else if (!ustricmp(p->keyword, L"text-listitem-indent")) {
            ret.listindentafter = utoi(uadv(p->keyword));
          } else if (!ustricmp(p->keyword, L"text-chapter-align")) {
            ret.achapter.align = utoalign(uadv(p->keyword));
          } else if (!ustricmp(p->keyword, L"text-chapter-underline")) {
            ret.achapter.underline = uadv(p->keyword);
          } else if (!ustricmp(p->keyword, L"text-chapter-numeric")) {
            ret.achapter.just_numbers = utob(uadv(p->keyword));
          } else if (!ustricmp(p->keyword, L"text-chapter-suffix")) {
            ret.achapter.number_suffix = uadv(p->keyword);
          } else if (!ustricmp(p->keyword, L"text-section-align")) {
            wchar_t *q = uadv(p->keyword);
            int n = 0;
            if (uisdigit(*q)) {
                n = utoi(q);
                q = uadv(q);
            }
            if (n >= ret.nasect) {
                int i;
                ret.asect = sresize(ret.asect, n+1, alignstruct);
                for (i = ret.nasect; i <= n; i++)
                  ret.asect[i] = ret.asect[ret.nasect-1];
                ret.nasect = n+1;
            }
            ret.asect[n].align = utoalign(q);
          } else if (!ustricmp(p->keyword, L"text-section-underline")) {
            wchar_t *q = uadv(p->keyword);
            int n = 0;
            if (uisdigit(*q)) {
                n = utoi(q);
                q = uadv(q);
            }
            if (n >= ret.nasect) {
                int i;
                ret.asect = sresize(ret.asect, n+1, alignstruct);
                for (i = ret.nasect; i <= n; i++)
                  ret.asect[i] = ret.asect[ret.nasect-1];
                ret.nasect = n+1;
            }
            ret.asect[n].underline = q;
          } else if (!ustricmp(p->keyword, L"text-section-numeric")) {
            wchar_t *q = uadv(p->keyword);
            int n = 0;
            if (uisdigit(*q)) {
                n = utoi(q);
                q = uadv(q);
            }
            if (n >= ret.nasect) {
                int i;
                ret.asect = sresize(ret.asect, n+1, alignstruct);
                for (i = ret.nasect; i <= n; i++)
                  ret.asect[i] = ret.asect[ret.nasect-1];
                ret.nasect = n+1;
            }
            ret.asect[n].just_numbers = utob(q);
          } else if (!ustricmp(p->keyword, L"text-section-suffix")) {
            wchar_t *q = uadv(p->keyword);
            int n = 0;
            if (uisdigit(*q)) {
                n = utoi(q);
                q = uadv(q);
            }
            if (n >= ret.nasect) {
                int i;
                ret.asect = sresize(ret.asect, n+1, alignstruct);
                for (i = ret.nasect; i <= n; i++) {
                  ret.asect[i] = ret.asect[ret.nasect-1];
                }
                ret.nasect = n+1;
            }
            ret.asect[n].number_suffix = q;
          } else if (!ustricmp(p->keyword, L"text-title-align")) {
            ret.atitle.align = utoalign(uadv(p->keyword));
          } else if (!ustricmp(p->keyword, L"text-title-underline")) {
            ret.atitle.underline = uadv(p->keyword);
          } else if (!ustricmp(p->keyword, L"text-versionid")) {
            ret.include_version_id = utob(uadv(p->keyword));
          } else if (!ustricmp(p->keyword, L"text-indent-preamble")) {
            ret.indent_preambles = utob(uadv(p->keyword));
          } else if (!ustricmp(p->keyword, L"text-bullet")) {
            ret.bullet.text = uadv(p->keyword);
          } else if (!ustricmp(p->keyword, L"text-rule")) {
            ret.rule = uadv(p->keyword);
          } else if (!ustricmp(p->keyword, L"text-list-suffix")) {
            ret.listsuffix = uadv(p->keyword);
          } else if (!ustricmp(p->keyword, L"text-emphasis")) {
            if (*uadv(p->keyword) && *uadv(uadv(p->keyword))) {
                ret.startemph = uadv(p->keyword);
                ret.endemph = uadv(ret.startemph);
            }
          } else if (!ustricmp(p->keyword, L"text-quotes")) {
            if (*uadv(p->keyword) && *uadv(uadv(p->keyword))) {
                ret.lquote = uadv(p->keyword);
                ret.rquote = uadv(ret.lquote);
            }
          }
      }
    }

    /*
     * Now process fallbacks on quote characters, underlines, the
     * rule character, the emphasis characters, and bullets.
     */
    while (*uadv(ret.rquote) && *uadv(uadv(ret.rquote)) &&
         (!cvt_ok(ret.charset, ret.lquote) ||
          !cvt_ok(ret.charset, ret.rquote))) {
      ret.lquote = uadv(ret.rquote);
      ret.rquote = uadv(ret.lquote);
    }

    while (*uadv(ret.endemph) && *uadv(uadv(ret.endemph)) &&
         (!cvt_ok(ret.charset, ret.startemph) ||
          !cvt_ok(ret.charset, ret.endemph))) {
      ret.startemph = uadv(ret.endemph);
      ret.endemph = uadv(ret.startemph);
    }

    while (*ret.atitle.underline && *uadv(ret.atitle.underline) &&
         !cvt_ok(ret.charset, ret.atitle.underline))
      ret.atitle.underline = uadv(ret.atitle.underline);
    
    while (*ret.achapter.underline && *uadv(ret.achapter.underline) &&
         !cvt_ok(ret.charset, ret.achapter.underline))
      ret.achapter.underline = uadv(ret.achapter.underline);

    for (n = 0; n < ret.nasect; n++) {
      while (*ret.asect[n].underline && *uadv(ret.asect[n].underline) &&
             !cvt_ok(ret.charset, ret.asect[n].underline))
          ret.asect[n].underline = uadv(ret.asect[n].underline);
    }
    
    while (*ret.bullet.text && *uadv(ret.bullet.text) &&
         !cvt_ok(ret.charset, ret.bullet.text))
      ret.bullet.text = uadv(ret.bullet.text);

    while (*ret.rule && *uadv(ret.rule) &&
         !cvt_ok(ret.charset, ret.rule))
      ret.rule = uadv(ret.rule);

    return ret;
}

paragraph *text_config_filename(char *filename)
{
    return cmdline_cfg_simple("text-filename", filename, NULL);
}

void text_backend(paragraph *sourceform, keywordlist *keywords,
              indexdata *idx, void *unused) {
    paragraph *p;
    textconfig conf;
    word *prefix, *body, *wp;
    word spaceword;
    textfile tf;
    wchar_t *prefixextra;
    int nesting, nestindent;
    int indentb, indenta;

    IGNORE(unused);
    IGNORE(keywords);                /* we don't happen to need this */
    IGNORE(idx);               /* or this */

    conf = text_configure(sourceform);

    /*
     * Open the output file.
     */
    tf.fp = fopen(conf.filename, "w");
    if (!tf.fp) {
      error(err_cantopenw, conf.filename);
      return;
    }
    tf.charset = conf.charset;
    tf.state = charset_init_state;

    /* Do the title */
    for (p = sourceform; p; p = p->next)
      if (p->type == para_Title)
          text_heading(&tf, NULL, NULL, p->words,
                   conf.atitle, conf.indent, conf.width, &conf);

    nestindent = conf.listindentbefore + conf.listindentafter;
    nesting = (conf.indent_preambles ? 0 : -conf.indent);

    /* Do the main document */
    for (p = sourceform; p; p = p->next) switch (p->type) {

      case para_QuotePush:
      nesting += 2;
      break;
      case para_QuotePop:
      nesting -= 2;
      assert(nesting >= 0);
      break;

      case para_LcontPush:
      nesting += nestindent;
      break;
      case para_LcontPop:
      nesting -= nestindent;
      assert(nesting >= 0);
      break;

      /*
       * Things we ignore because we've already processed them or
       * aren't going to touch them in this pass.
       */
      case para_IM:
      case para_BR:
      case para_Biblio:              /* only touch BiblioCited */
      case para_VersionID:
      case para_NoCite:
      case para_Title:
      break;

      /*
       * Chapter titles.
       */
      case para_Chapter:
      case para_Appendix:
      case para_UnnumberedChapter:
      text_heading(&tf, p->kwtext, p->kwtext2, p->words,
                 conf.achapter, conf.indent, conf.width, &conf);
      nesting = 0;
      break;

      case para_Heading:
      case para_Subsect:
      text_heading(&tf, p->kwtext, p->kwtext2, p->words,
                 conf.asect[p->aux>=conf.nasect ? conf.nasect-1 : p->aux],
                 conf.indent, conf.width, &conf);
      break;

      case para_Rule:
      text_rule(&tf, conf.indent + nesting, conf.width - nesting, &conf);
      break;

      case para_Normal:
      case para_Copyright:
      case para_DescribedThing:
      case para_Description:
      case para_BiblioCited:
      case para_Bullet:
      case para_NumberedList:
      if (p->type == para_Bullet) {
          prefix = &conf.bullet;
          prefixextra = NULL;
          indentb = conf.listindentbefore;
          indenta = conf.listindentafter;
      } else if (p->type == para_NumberedList) {
          prefix = p->kwtext;
          prefixextra = conf.listsuffix;
          indentb = conf.listindentbefore;
          indenta = conf.listindentafter;
      } else if (p->type == para_Description) {
          prefix = NULL;
          prefixextra = NULL;
          indentb = conf.listindentbefore;
          indenta = conf.listindentafter;
      } else {
          prefix = NULL;
          prefixextra = NULL;
          indentb = indenta = 0;
      }
      if (p->type == para_BiblioCited) {
          body = dup_word_list(p->kwtext);
          for (wp = body; wp->next; wp = wp->next);
          wp->next = &spaceword;
          spaceword.next = p->words;
          spaceword.alt = NULL;
          spaceword.type = word_WhiteSpace;
          spaceword.text = NULL;
      } else {
          wp = NULL;
          body = p->words;
      }
      text_para(&tf, prefix, prefixextra, body,
              conf.indent + nesting + indentb, indenta,
              conf.width - nesting - indentb - indenta, &conf);
      if (wp) {
          wp->next = NULL;
          free_word_list(body);
      }
      break;

      case para_Code:
      text_codepara(&tf, p->words,
                  conf.indent + nesting + conf.indent_code,
                  conf.width - nesting - 2 * conf.indent_code);
      break;
    }

    /* Do the version ID */
    if (conf.include_version_id) {
      for (p = sourceform; p; p = p->next)
          if (p->type == para_VersionID)
            text_versionid(&tf, p->words, &conf);
    }

    /*
     * Tidy up
     */
    text_output(&tf, NULL);          /* end charset conversion */
    fclose(tf.fp);
    sfree(conf.asect);
    sfree(conf.filename);
}

static void text_output(textfile *tf, const wchar_t *s)
{
    char buf[256];
    int ret, len;
    const wchar_t **sp;

    if (!s) {
      sp = NULL;
      len = 1;
    } else {
      sp = &s;
      len = ustrlen(s);
    }

    while (len > 0) {
      ret = charset_from_unicode(sp, &len, buf, lenof(buf),
                           tf->charset, &tf->state, NULL);
      if (!sp)
          len = 0;
      fwrite(buf, 1, ret, tf->fp);
    }
}

static void text_output_many(textfile *tf, int n, wchar_t c)
{
    wchar_t s[2];
    s[0] = c;
    s[1] = L'\0';
    while (n--)
      text_output(tf, s);
}

static void text_rdaddw(rdstring *rs, word *text, word *end, textconfig *cfg) {
    for (; text && text != end; text = text->next) switch (text->type) {
      case word_HyperLink:
      case word_HyperEnd:
      case word_UpperXref:
      case word_LowerXref:
      case word_XrefEnd:
      case word_IndexRef:
      break;

      case word_Normal:
      case word_Emph:
      case word_Code:
      case word_WeakCode:
      case word_WhiteSpace:
      case word_EmphSpace:
      case word_CodeSpace:
      case word_WkCodeSpace:
      case word_Quote:
      case word_EmphQuote:
      case word_CodeQuote:
      case word_WkCodeQuote:
      assert(text->type != word_CodeQuote &&
             text->type != word_WkCodeQuote);
      if (towordstyle(text->type) == word_Emph &&
          (attraux(text->aux) == attr_First ||
           attraux(text->aux) == attr_Only))
          rdadds(rs, cfg->startemph);
      else if (towordstyle(text->type) == word_Code &&
             (attraux(text->aux) == attr_First ||
              attraux(text->aux) == attr_Only))
          rdadds(rs, cfg->lquote);
      if (removeattr(text->type) == word_Normal) {
          if (cvt_ok(cfg->charset, text->text) || !text->alt)
            rdadds(rs, text->text);
          else
            text_rdaddw(rs, text->alt, NULL, cfg);
      } else if (removeattr(text->type) == word_WhiteSpace) {
          rdadd(rs, L' ');
      } else if (removeattr(text->type) == word_Quote) {
          rdadds(rs, quoteaux(text->aux) == quote_Open ?
               cfg->lquote : cfg->rquote);
      }
      if (towordstyle(text->type) == word_Emph &&
          (attraux(text->aux) == attr_Last ||
           attraux(text->aux) == attr_Only))
          rdadds(rs, cfg->endemph);
      else if (towordstyle(text->type) == word_Code &&
             (attraux(text->aux) == attr_Last ||
              attraux(text->aux) == attr_Only))
          rdadds(rs, cfg->rquote);
      break;
    }
}

static int text_width(void *, word *);

static int text_width_list(void *ctx, word *text) {
    int w = 0;
    while (text) {
      w += text_width(ctx, text);
      text = text->next;
    }
    return w;
}

static int text_width(void *ctx, word *text) {
    textconfig *cfg = (textconfig *)ctx;
    int wid;
    int attr;

    switch (text->type) {
      case word_HyperLink:
      case word_HyperEnd:
      case word_UpperXref:
      case word_LowerXref:
      case word_XrefEnd:
      case word_IndexRef:
      return 0;
    }

    assert(text->type < word_internal_endattrs);

    wid = 0;
    attr = towordstyle(text->type);
    if (attr == word_Emph || attr == word_Code) {
      if (attraux(text->aux) == attr_Only ||
          attraux(text->aux) == attr_First)
          wid += ustrwid(attr == word_Emph ? cfg->startemph : cfg->lquote,
                     cfg->charset);
    }
    if (attr == word_Emph || attr == word_Code) {
      if (attraux(text->aux) == attr_Only ||
          attraux(text->aux) == attr_Last)
          wid += ustrwid(attr == word_Emph ? cfg->startemph : cfg->lquote,
                     cfg->charset);
    }

    switch (text->type) {
      case word_Normal:
      case word_Emph:
      case word_Code:
      case word_WeakCode:
      if (cvt_ok(cfg->charset, text->text) || !text->alt)
          wid += ustrwid(text->text, cfg->charset);
      else
          wid += text_width_list(ctx, text->alt);
      return wid;

      case word_WhiteSpace:
      case word_EmphSpace:
      case word_CodeSpace:
      case word_WkCodeSpace:
      case word_Quote:
      case word_EmphQuote:
      case word_CodeQuote:
      case word_WkCodeQuote:
      assert(text->type != word_CodeQuote &&
             text->type != word_WkCodeQuote);
      if (removeattr(text->type) == word_Quote) {
          if (quoteaux(text->aux) == quote_Open)
            wid += ustrwid(cfg->lquote, cfg->charset);
          else
            wid += ustrwid(cfg->rquote, cfg->charset);
      } else
          wid++;               /* space */
    }

    return wid;
}

static void text_heading(textfile *tf, word *tprefix, word *nprefix,
                   word *text, alignstruct align,
                   int indent, int width, textconfig *cfg) {
    rdstring t = { 0, 0, NULL };
    int margin, length;
    int firstlinewidth, wrapwidth;
    wrappedline *wrapping, *p;

    if (align.just_numbers && nprefix) {
      text_rdaddw(&t, nprefix, NULL, cfg);
      rdadds(&t, align.number_suffix);
    } else if (!align.just_numbers && tprefix) {
      text_rdaddw(&t, tprefix, NULL, cfg);
      rdadds(&t, align.number_suffix);
    }
    margin = length = ustrwid(t.text ? t.text : L"", cfg->charset);

    if (align.align == LEFTPLUS) {
      margin = indent - margin;
      if (margin < 0) margin = 0;
      firstlinewidth = indent + width - margin - length;
      wrapwidth = width;
    } else if (align.align == LEFT || align.align == CENTRE) {
      margin = 0;
      firstlinewidth = indent + width - length;
      wrapwidth = indent + width;
    }

    wrapping = wrap_para(text, firstlinewidth, wrapwidth,
                   text_width, cfg, 0);
    for (p = wrapping; p; p = p->next) {
      text_rdaddw(&t, p->begin, p->end, cfg);
      length = ustrwid(t.text ? t.text : L"", cfg->charset);
      if (align.align == CENTRE) {
          margin = (indent + width - length)/2;
          if (margin < 0) margin = 0;
      }
      text_output_many(tf, margin, L' ');
      text_output(tf, t.text);
      text_output(tf, L"\n");
      if (*align.underline) {
          text_output_many(tf, margin, L' ');
          while (length > 0) {
            text_output(tf, align.underline);
            length -= ustrwid(align.underline, cfg->charset);
          }
          text_output(tf, L"\n");
      }
      if (align.align == LEFTPLUS)
          margin = indent;
      else
          margin = 0;
      sfree(t.text);
      t = empty_rdstring;
    }
    wrap_free(wrapping);
    text_output(tf, L"\n");

    sfree(t.text);
}

static void text_rule(textfile *tf, int indent, int width, textconfig *cfg) {
    text_output_many(tf, indent, L' ');
    while (width > 0) {
      text_output(tf, cfg->rule);
      width -= ustrwid(cfg->rule, cfg->charset);
    }
    text_output_many(tf, 2, L'\n');
}

static void text_para(textfile *tf, word *prefix, wchar_t *prefixextra,
                  word *text, int indent, int extraindent, int width,
                  textconfig *cfg) {
    wrappedline *wrapping, *p;
    rdstring pfx = { 0, 0, NULL };
    int e;
    int firstlinewidth = width;

    if (prefix) {
      text_rdaddw(&pfx, prefix, NULL, cfg);
      if (prefixextra)
          rdadds(&pfx, prefixextra);
      text_output_many(tf, indent, L' ');
      text_output(tf, pfx.text);
      /* If the prefix is too long, shorten the first line to fit. */
      e = extraindent - ustrwid(pfx.text ? pfx.text : L"", cfg->charset);
      if (e < 0) {
          firstlinewidth += e;       /* this decreases it, since e < 0 */
          if (firstlinewidth < 0) {
            e = indent + extraindent;
            firstlinewidth = width;
            text_output(tf, L"\n");
          } else
            e = 0;
      }
      sfree(pfx.text);
    } else
      e = indent + extraindent;

    wrapping = wrap_para(text, firstlinewidth, width,
                   text_width, cfg, 0);
    for (p = wrapping; p; p = p->next) {
      rdstring t = { 0, 0, NULL };
      text_rdaddw(&t, p->begin, p->end, cfg);
      text_output_many(tf, e, L' ');
      text_output(tf, t.text);
      text_output(tf, L"\n");
      e = indent + extraindent;
      sfree(t.text);
    }
    wrap_free(wrapping);
    text_output(tf, L"\n");
}

static void text_codepara(textfile *tf, word *text, int indent, int width) {
    for (; text; text = text->next) if (text->type == word_WeakCode) {
      int wid = ustrwid(text->text, tf->charset);
      if (wid > width)
          error(err_text_codeline, &text->fpos, wid, width);
      text_output_many(tf, indent, L' ');
      text_output(tf, text->text);
      text_output(tf, L"\n");
    }

    text_output(tf, L"\n");
}

static void text_versionid(textfile *tf, word *text, textconfig *cfg) {
    rdstring t = { 0, 0, NULL };

    rdadd(&t, L'[');
    text_rdaddw(&t, text, NULL, cfg);
    rdadd(&t, L']');
    rdadd(&t, L'\n');

    text_output(tf, t.text);
    sfree(t.text);
}

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