oops, moved files without adding

src/glue.c

@@ -0,0 +1,170 @@
+#include "glue.h"
+#include "../src/internal.h"  // for h_carray_*
+
+
+// The action equivalent of h_ignore.
+const HParsedToken *h_act_ignore(const HParseResult *p)
+{
+  return NULL;
+}
+
+// Helper to build HAction's that pick one index out of a sequence.
+const HParsedToken *h_act_index(int i, const HParseResult *p)
+{
+    if(!p) return NULL;
+
+    const HParsedToken *tok = p->ast;
+
+    if(!tok || tok->token_type != TT_SEQUENCE)
+        return NULL;
+
+    const HCountedArray *seq = tok->seq;
+    size_t n = seq->used;
+
+    if(i<0 || (size_t)i>=n)
+        return NULL;
+    else
+        return tok->seq->elements[i];
+}
+
+// Action version of h_seq_flatten.
+const HParsedToken *h_act_flatten(const HParseResult *p) {
+  return h_seq_flatten(p->arena, p->ast);
+}
+
+// Low-level helper for the h_make family.
+HParsedToken *h_make_(HArena *arena, HTokenType type)
+{
+  HParsedToken *ret = h_arena_malloc(arena, sizeof(HParsedToken));
+  ret->token_type = type;
+  return ret;
+}
+
+HParsedToken *h_make(HArena *arena, HTokenType type, void *value)
+{
+  assert(type >= TT_USER);
+  HParsedToken *ret = h_make_(arena, type);
+  ret->user = value;
+  return ret;
+}
+
+HParsedToken *h_make_seq(HArena *arena)
+{
+  HParsedToken *ret = h_make_(arena, TT_SEQUENCE);
+  ret->seq = h_carray_new(arena);
+  return ret;
+}
+
+HParsedToken *h_make_bytes(HArena *arena, size_t len)
+{
+  HParsedToken *ret = h_make_(arena, TT_BYTES);
+  ret->bytes.len = len;
+  ret->bytes.token = h_arena_malloc(arena, len);
+  return ret;
+}
+
+HParsedToken *h_make_sint(HArena *arena, int64_t val)
+{
+  HParsedToken *ret = h_make_(arena, TT_SINT);
+  ret->sint = val;
+  return ret;
+}
+
+HParsedToken *h_make_uint(HArena *arena, uint64_t val)
+{
+  HParsedToken *ret = h_make_(arena, TT_UINT);
+  ret->uint = val;
+  return ret;
+}
+
+// XXX -> internal
+HParsedToken *h_carray_index(const HCountedArray *a, size_t i)
+{
+  assert(i < a->used);
+  return a->elements[i];
+}
+
+size_t h_seq_len(const HParsedToken *p)
+{
+  assert(p != NULL);
+  assert(p->token_type == TT_SEQUENCE);
+  return p->seq->used;
+}
+
+HParsedToken **h_seq_elements(const HParsedToken *p)
+{
+  assert(p != NULL);
+  assert(p->token_type == TT_SEQUENCE);
+  return p->seq->elements;
+}
+
+HParsedToken *h_seq_index(const HParsedToken *p, size_t i)
+{
+  assert(p != NULL);
+  assert(p->token_type == TT_SEQUENCE);
+  return h_carray_index(p->seq, i);
+}
+
+HParsedToken *h_seq_index_path(const HParsedToken *p, size_t i, ...)
+{
+  va_list va;
+
+  va_start(va, i);
+  HParsedToken *ret = h_seq_index_vpath(p, i, va);
+  va_end(va);
+
+  return ret;
+}
+
+HParsedToken *h_seq_index_vpath(const HParsedToken *p, size_t i, va_list va)
+{
+  HParsedToken *ret = h_seq_index(p, i);
+  int j;
+
+  while((j = va_arg(va, int)) >= 0)
+    ret = h_seq_index(p, j);
+
+  return ret;
+}
+
+void h_seq_snoc(HParsedToken *xs, const HParsedToken *x)
+{
+  assert(xs != NULL);
+  assert(xs->token_type == TT_SEQUENCE);
+
+  h_carray_append(xs->seq, (HParsedToken *)x);
+}
+
+void h_seq_append(HParsedToken *xs, const HParsedToken *ys)
+{
+  assert(xs != NULL);
+  assert(xs->token_type == TT_SEQUENCE);
+  assert(ys != NULL);
+  assert(ys->token_type == TT_SEQUENCE);
+
+  for(size_t i; i<ys->seq->used; i++)
+    h_carray_append(xs->seq, ys->seq->elements[i]);
+}
+
+// Flatten nested sequences. Always returns a sequence.
+// If input element is not a sequence, returns it as a singleton sequence.
+const HParsedToken *h_seq_flatten(HArena *arena, const HParsedToken *p)
+{
+  assert(p != NULL);
+
+  HParsedToken *ret = h_make_seq(arena);
+  switch(p->token_type) {
+  case TT_SEQUENCE:
+    // Flatten and append all.
+    for(size_t i; i<p->seq->used; i++) {
+      h_seq_append(ret, h_seq_flatten(arena, h_seq_index(p, i)));
+    }
+    break;
+  default:
+    // Make singleton sequence.
+    h_seq_snoc(ret, p);
+    break;
+  }
+
+  return ret;
+}