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Overview
Comment:Add "foreach" loops to TH1.
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SHA3-256: 3316b29225dc6048a8accf9a3466f47fbbb8260324edc415faee2469ce697e65
User & Date: drh 2021-01-26 13:50:48.794
Context
2021-01-26
15:27
Enhance 'fossil branch list' to accept a GLOB argument and show only matching branches. ... (check-in: 6a5cdecddc user: danield tags: trunk)
13:50
Add "foreach" loops to TH1. ... (check-in: 3316b29225 user: drh tags: trunk)
13:45
Added link to "git checkout" koan from the gitusers doc. ... (check-in: 57d9b020b8 user: wyoung tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/th_lang.c.
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  if( rc==TH_BREAK ) rc = TH_OK;
  return rc;
}

/*
** TH Syntax:








































**
**   list ?arg1 ?arg2? ...?
*/
static int list_command(
  Th_Interp *interp,
  void *ctx,
  int argc,







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  if( rc==TH_BREAK ) rc = TH_OK;
  return rc;
}

/*
** TH Syntax:
**
**   foreach VARLIST LIST SCRIPT
*/
static int foreach_command(
  Th_Interp *interp,
  void *ctx,
  int argc,
  const char **argv,
  int *argl
){
  int rc;
  char **azVar = 0;
  int *anVar;
  int nVar;
  char **azValue = 0;
  int *anValue;
  int nValue;
  int ii, jj;

  if( argc!=4 ){
    return Th_WrongNumArgs(interp, "foreach varlist list script");
  }
  rc = Th_SplitList(interp, argv[1], argl[1], &azVar, &anVar, &nVar);
  if( rc ) return rc;
  rc = Th_SplitList(interp, argv[2], argl[2], &azValue, &anValue, &nValue);
  for(ii=0; rc==TH_OK && ii<=nValue-nVar; ii+=nVar){
    for(jj=0; jj<nVar; jj++){
      Th_SetVar(interp, azVar[jj], anVar[jj], azValue[ii+jj], anValue[ii+jj]);
    }
    rc = eval_loopbody(interp, argv[3], argl[3]);
  }
  if( rc==TH_BREAK ) rc = TH_OK;
  Th_Free(interp, azVar);
  Th_Free(interp, azValue);
  return rc;
}


/*
** TH Syntax:
**
**   list ?arg1 ?arg2? ...?
*/
static int list_command(
  Th_Interp *interp,
  void *ctx,
  int argc,
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    Th_CommandProc xProc;
    void *pContext;
  } aCommand[] = {
    {"array",    array_command,   0},
    {"catch",    catch_command,   0},
    {"expr",     expr_command,    0},
    {"for",      for_command,     0},

    {"if",       if_command,      0},
    {"info",     info_command,    0},
    {"lindex",   lindex_command,  0},
    {"list",     list_command,    0},
    {"llength",  llength_command, 0},
    {"lsearch",  lsearch_command, 0},
    {"proc",     proc_command,    0},







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    Th_CommandProc xProc;
    void *pContext;
  } aCommand[] = {
    {"array",    array_command,   0},
    {"catch",    catch_command,   0},
    {"expr",     expr_command,    0},
    {"for",      for_command,     0},
    {"foreach",  foreach_command, 0},
    {"if",       if_command,      0},
    {"info",     info_command,    0},
    {"lindex",   lindex_command,  0},
    {"list",     list_command,    0},
    {"llength",  llength_command, 0},
    {"lsearch",  lsearch_command, 0},
    {"proc",     proc_command,    0},
Changes to www/th1.md.
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  *  array names VARNAME
  *  break
  *  catch SCRIPT ?VARIABLE?
  *  continue
  *  error ?STRING?
  *  expr EXPR
  *  for INIT-SCRIPT TEST-EXPR NEXT-SCRIPT BODY-SCRIPT

  *  if EXPR SCRIPT (elseif EXPR SCRIPT)* ?else SCRIPT?
  *  info commands
  *  info exists VARNAME
  *  info vars
  *  lindex LIST INDEX
  *  list ARG ...
  *  llength LIST







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  *  array names VARNAME
  *  break
  *  catch SCRIPT ?VARIABLE?
  *  continue
  *  error ?STRING?
  *  expr EXPR
  *  for INIT-SCRIPT TEST-EXPR NEXT-SCRIPT BODY-SCRIPT
  *  foreach VARIABLE-LIST VALUE-LIST BODY-SCRIPT
  *  if EXPR SCRIPT (elseif EXPR SCRIPT)* ?else SCRIPT?
  *  info commands
  *  info exists VARNAME
  *  info vars
  *  lindex LIST INDEX
  *  list ARG ...
  *  llength LIST