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switch semantic base64 examples to pre-fab actions provided by glue.h

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This commit is contained in:
Sven M. Hallberg 2013-02-17 15:53:43 +01:00
parent 38ddcc5ab4
commit a5c579c23d
2 changed files with 12 additions and 97 deletions
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64
examples/base64_sem1.c
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@ -13,50 +13,11 @@
// base64_sem2.c for an alternative approach using a single top-level action.
#include "../src/hammer.h"
#include "../src/glue.h"
#include "../src/internal.h" // for h_carray functions (XXX ?!)
#include <assert.h>
#define H_RULE(rule, def) const HParser *rule = def
#define H_ARULE(rule, def) const HParser *rule = h_action(def, act_ ## rule)
///
// Semantic action helpers.
// These might be candidates for inclusion in the library.
///
// The action equivalent of h_ignore.
const HParsedToken *act_ignore(const HParseResult *p)
{
return NULL;
}
// Helper to build HAction's that pick one index out of a sequence.
const HParsedToken *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];
}
const HParsedToken *act_index0(const HParseResult *p)
{
return act_index(0, p);
}
///
// Semantic actions for the grammar below, each corresponds to an "ARULE".
// They must be named act_<rulename>.
@ -84,11 +45,13 @@ const HParsedToken *act_bsfdig(const HParseResult *p)
return res;
}
H_ACT_APPLY(act_index0, h_act_index, 0);
#define act_bsfdig_4bit act_bsfdig
#define act_bsfdig_2bit act_bsfdig
#define act_equals act_ignore
#define act_ws act_ignore
#define act_equals h_act_ignore
#define act_ws h_act_ignore
#define act_document act_index0
@ -124,20 +87,9 @@ const HParsedToken *act_base64_n(int n, const HParseResult *p)
return res;
}
const HParsedToken *act_base64_3(const HParseResult *p)
{
return act_base64_n(3, p);
}
const HParsedToken *act_base64_2(const HParseResult *p)
{
return act_base64_n(2, p);
}
const HParsedToken *act_base64_1(const HParseResult *p)
{
return act_base64_n(1, p);
}
H_ACT_APPLY(act_base64_3, act_base64_n, 3);
H_ACT_APPLY(act_base64_2, act_base64_n, 2);
H_ACT_APPLY(act_base64_1, act_base64_n, 1);
// Helper to concatenate two arrays.
void carray_concat(HCountedArray *a, const HCountedArray *b)