emit

include/fh_mem.h

@@ -7,6 +7,8 @@
 #ifndef FORTH_FH_MEM_H
 #define FORTH_FH_MEM_H
 
+void fh_setbase(struct fh_thread_s *fh, uint32_t base);
+
 enum fh_error fh_fetch(struct fh_thread_s *fh, uint32_t addr, uint32_t *dst);
 
 enum fh_error fh_fetch_char(struct fh_thread_s *fh, uint32_t addr, char *dst);

src/fh_builtins.c

@@ -10,6 +10,55 @@
 
 #define TOBOOL(a) (a == 0 ? 0 : 0xFFFFFFFF)
 
+
+/**
+ * Encode a code point using UTF-8
+ *
+ * Copied from ESPTERM source
+ *
+ * @param out - output buffer (min 4 characters), will be 0-terminated if shorten than 4
+ * @param utf - code point 0-0x10FFFF
+ * @return number of bytes on success, 0 on failure (also produces U+FFFD, which uses 3 bytes)
+ */
+static int utf8_encode(char *out, uint32_t utf)
+{
+  if (utf <= 0x7F) {
+    // Plain ASCII
+    out[0] = (char) utf;
+    out[1] = 0;
+    return 1;
+  } else if (utf <= 0x07FF) {
+    // 2-byte unicode
+    out[0] = (char) (((utf >> 6) & 0x1F) | 0xC0);
+    out[1] = (char) (((utf >> 0) & 0x3F) | 0x80);
+    out[2] = 0;
+    return 2;
+  } else if (utf <= 0xFFFF) {
+    // 3-byte unicode
+    out[0] = (char) (((utf >> 12) & 0x0F) | 0xE0);
+    out[1] = (char) (((utf >> 6) & 0x3F) | 0x80);
+    out[2] = (char) (((utf >> 0) & 0x3F) | 0x80);
+    out[3] = 0;
+    return 3;
+  } else if (utf <= 0x10FFFF) {
+    // 4-byte unicode
+    out[0] = (char) (((utf >> 18) & 0x07) | 0xF0);
+    out[1] = (char) (((utf >> 12) & 0x3F) | 0x80);
+    out[2] = (char) (((utf >> 6) & 0x3F) | 0x80);
+    out[3] = (char) (((utf >> 0) & 0x3F) | 0x80);
+//		out[4] = 0;
+    return 4;
+  } else {
+    // error - use replacement character
+    out[0] = (char) 0xEF;
+    out[1] = (char) 0xBF;
+    out[2] = (char) 0xBD;
+    out[3] = 0;
+    return 0;
+  }
+}
+
+
 static enum fh_error w_plus(struct fh_thread_s *fh, const struct fh_word_s *w)
 {
   (void) w;
@@ -247,7 +296,7 @@ static enum fh_error w_semicolon(struct fh_thread_s *fh, const struct fh_word_s
   return FH_OK;
 }
 
-static enum fh_error w_dup(struct fh_thread_s *fh, const struct fh_word_s *w)
+static enum fh_error w_dupe(struct fh_thread_s *fh, const struct fh_word_s *w)
 {
   (void) w;
   enum fh_error rv;
@@ -257,6 +306,18 @@ static enum fh_error w_dup(struct fh_thread_s *fh, const struct fh_word_s *w)
   return FH_OK;
 }
 
+static enum fh_error w_question_dupe(struct fh_thread_s *fh, const struct fh_word_s *w)
+{
+  (void) w;
+  enum fh_error rv;
+  uint32_t a = 0;
+  TRY(ds_peek(fh, &a));
+  if (a) {
+    TRY(ds_push(fh, a));
+  }
+  return FH_OK;
+}
+
 static enum fh_error w_two_dup(struct fh_thread_s *fh, const struct fh_word_s *w)
 {
   (void) w;
@@ -475,11 +536,10 @@ static enum fh_error w_type(struct fh_thread_s *fh, const struct fh_word_s *w)
   return FH_OK;
 }
 
-static enum fh_error w_cr(struct fh_thread_s *fh, const struct fh_word_s *w)
+static enum fh_error wp_putc(struct fh_thread_s *fh, const struct fh_word_s *w)
 {
-  (void) w;
   (void) fh;
-  FHPRINT("\n");
+  FHPRINT("%c", w->param);
   return FH_OK;
 }
 
@@ -576,18 +636,36 @@ static enum fh_error w_bye(struct fh_thread_s *fh, const struct fh_word_s *w)
 }
 
 static enum fh_error wp_setbase(struct fh_thread_s *fh, const struct fh_word_s *w)
+{
+  fh_setbase(fh, w->param);
+  return FH_OK;
+}
+
+static enum fh_error w_emit(struct fh_thread_s *fh, const struct fh_word_s *w)
 {
   (void) w;
   enum fh_error rv;
-  fh->base = w->param;
+  uint32_t a;
+  TRY(ds_pop(fh, &a));
+
+  char buf[5];
+  int num = utf8_encode(buf, a);
+  FHPRINT("%.*s", num, buf);
+  return FH_OK;
+}
+
+static enum fh_error wp_const(struct fh_thread_s *fh, const struct fh_word_s *w)
+{
+  enum fh_error rv;
+  TRY(ds_push(fh, w->param));
   return FH_OK;
 }
 
-static enum fh_error w_base(struct fh_thread_s *fh, const struct fh_word_s *w)
+static enum fh_error w_depth(struct fh_thread_s *fh, const struct fh_word_s *w)
 {
   (void) w;
   enum fh_error rv;
-  TRY(ds_push(fh, MAGICADDR_BASE));
+  TRY(ds_push(fh, w->param));
   return FH_OK;
 }
 
@@ -665,14 +743,21 @@ enum fh_error register_builtin_words(struct fh_thread_s *fh)
       {"!",       w_store,           0, 0},
       {"2!",      w_two_store,       0, 0},
       {"2@",      w_two_fetch,       0, 0},
+      // TODO +!
+      // TODO pictured numbers (#)
+      // TODO tick
+      // TODO comma
+      // TODO >BODY, >IN, >NUMBER
       /* Arithmetics */
-      {"dec",   wp_setbase,        0, 10},
+      {"decimal", wp_setbase,        0, 10},
       {"hex",     wp_setbase,        0, 16},
-      {"base",  w_base,            0, 0},
+      {"base",    wp_const,          0, MAGICADDR_BASE},
+      {"depth",   w_depth,           0, 0},
       {"+",       w_plus,            0, 0},
       {"-",       w_minus,           0, 0},
       {"*",       w_star,            0, 0},
       {"*/",      w_star_slash,      0, 0},
+      // TODO */mod
       {"/",       w_slash,           0, 0},
       {"/mod",    w_slash_mod,       0, 0},
       {"0<",      w_zero_less,       0, 0},
@@ -684,14 +769,19 @@ enum fh_error register_builtin_words(struct fh_thread_s *fh)
       {"<>",      w_not_equals,      0, 0},
       {">",       w_greater,         0, 0},
       {"1+",      wp_add,            0, 1},
+      {"char+",   wp_add,            0, 1},
       {"1-",      wp_add,            0, -1},
       {"2+",      wp_add,            0, 2},
       {"2-",      wp_add,            0, -2},
       {"2*",      wp_mul,            0, 2},
+      {"chars",   wp_mul,            0, 1},
       {"2/",      wp_div,            0, 2},
+      {"cells",   wp_mul,            0, CELL},
+      {"cell+",   wp_add,            0, CELL},
       /* Stack manip */
       {"drop",    w_drop,            0, 0},
-      {"dup",   w_dup,             0, 0},
+      {"dup",     w_dupe,            0, 0},
+      {"?dup",    w_question_dupe,   0, 0},
       {"over",    w_over,            0, 0},
       {"swap",    w_swap,            0, 0},
       {"rot",     w_rot,             0, 0},
@@ -714,9 +804,11 @@ enum fh_error register_builtin_words(struct fh_thread_s *fh)
       /* Printing */
       {".",       w_dot,             0, 0},
       {"type",    w_type,            0, 0},
-      {"cr",    w_cr,              0, 0},
-      {"space", w_space,           0, 0},
+      {"cr",      wp_putc,           0, '\n'},
+      {"space",   wp_putc,           0, ' '},
+      {"bl",      wp_const,          0, ' '},
       {"dump",    w_dump,            0, 0},
+      {"emit",    w_emit,            0, 0},
       /* Control flow */
       {"abort",   w_abort,           0, 0},
       {"quit",    w_quit,            0, 0},

src/fh_mem.c

@@ -5,6 +5,11 @@
 #include "fh_runtime.h"
 #include "fh_mem.h"
 
+void fh_setbase(struct fh_thread_s *fh, uint32_t base) {
+  LOG("BASE = %d", base);
+  fh->base = base;
+}
+
 enum fh_error fh_fetch(struct fh_thread_s *fh, uint32_t addr, uint32_t *dst)
 {
   switch (addr) {
@@ -45,7 +50,7 @@ enum fh_error fh_store(struct fh_thread_s *fh, uint32_t addr, uint32_t val)
 {
   switch (addr) {
     case MAGICADDR_BASE:
-      fh->base = val;
+      fh_setbase(fh, val);
       break;
       // TODO more magic
 

src/fh_runtime.c

@@ -221,10 +221,10 @@ static enum fh_error fh_handle_quoted_string(
 static enum fh_error fh_handle_word(
     struct fh_thread_s *fh,
     const char *start,
-    size_t len
+    const size_t wordlen
 )
 {
-  if (len >= MAX_NAME_LEN) {
+  if (wordlen >= MAX_NAME_LEN) {
     return FH_ERR_NAME_TOO_LONG;
   }
 
@@ -235,7 +235,7 @@ static enum fh_error fh_handle_word(
   uint32_t cnt = 0;
   enum fh_error rv;
   while (w->handler) {
-    if (0 == strncasecmp(start, w->name, len) && w->name[len] == 0) {
+    if (0 == strncasecmp(start, w->name, wordlen) && w->name[wordlen] == 0) {
       // word found!
       if (fh->state == FH_STATE_COMPILE && !w->immediate) {
         LOG("Compile word call: %s", w->name);
@@ -255,9 +255,22 @@ static enum fh_error fh_handle_word(
   /* word not found, try parsing as number */
   errno = 0;
   char *endptr;
-  long v = strtol(start, &endptr, (int) fh->base); // XXX if base is 0, this will use auto-detection
-  if (errno != 0 || endptr == start) {
-    LOGE("Unknown word and fail to parse as number: %.*s", (int) len, start);
+  int base = (int) fh->base;
+
+  // prefix can override BASE - this is a syntax extension
+  if (start[0] == '0') {
+    if (start[1] == 'x') {
+      base = 16;
+    } else if (start[1] == 'b') {
+      base = 2;
+    } else if (start[1] == 'o') {
+      base = 8;
+    }
+  }
+
+  long v = strtol(start, &endptr, base); // XXX if base is 0, this will use auto-detection
+  if (errno != 0 || (endptr - start) != wordlen) {
+    LOGE("Unknown word and fail to parse as number: %.*s", (int) wordlen, start);
     return FH_ERR_UNKNOWN_WORD;
   }