3 * Copyright © 2010 Intel Corporation
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6 * copy of this software and associated documentation files (the "Software"),
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10 * Software is furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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22 * DEALINGS IN THE SOFTWARE.
26 #include "s_expression.h"
28 s_symbol::s_symbol(const char *tmp
, size_t n
)
30 this->str
= ralloc_strndup (this, tmp
, n
);
31 assert(this->str
!= NULL
);
39 skip_whitespace(const char *& src
)
41 src
+= strspn(src
, " \v\t\r\n");
42 /* Also skip Scheme-style comments: semi-colon 'til end of line */
44 src
+= strcspn(src
, "\n");
50 read_atom(void *ctx
, const char *& src
)
52 s_expression
*expr
= NULL
;
56 size_t n
= strcspn(src
, "( \v\t\r\n);");
58 return NULL
; // no atom
60 // Check if the atom is a number.
61 char *float_end
= NULL
;
62 double f
= glsl_strtod(src
, &float_end
);
63 if (float_end
!= src
) {
65 int i
= strtol(src
, &int_end
, 10);
66 // If strtod matched more characters, it must have a decimal part
67 if (float_end
> int_end
)
68 expr
= new(ctx
) s_float(f
);
70 expr
= new(ctx
) s_int(i
);
72 // Not a number; return a symbol.
73 expr
= new(ctx
) s_symbol(src
, n
);
82 s_expression::read_expression(void *ctx
, const char *&src
)
86 s_expression
*atom
= read_atom(ctx
, src
);
94 s_list
*list
= new(ctx
) s_list
;
97 while ((expr
= read_expression(ctx
, src
)) != NULL
) {
98 list
->subexpressions
.push_tail(expr
);
100 skip_whitespace(src
);
102 printf("Unclosed expression (check your parenthesis).\n");
113 printf("%d", this->val
);
116 void s_float::print()
118 printf("%f", this->val
);
121 void s_symbol::print()
123 printf("%s", this->str
);
129 foreach_iter(exec_list_iterator
, it
, this->subexpressions
) {
130 s_expression
*expr
= (s_expression
*) it
.get();
132 if (!expr
->next
->is_tail_sentinel())
138 // --------------------------------------------------
141 s_pattern::match(s_expression
*expr
)
145 case EXPR
: *p_expr
= expr
; break;
146 case LIST
: if (expr
->is_list()) *p_list
= (s_list
*) expr
; break;
147 case SYMBOL
: if (expr
->is_symbol()) *p_symbol
= (s_symbol
*) expr
; break;
148 case NUMBER
: if (expr
->is_number()) *p_number
= (s_number
*) expr
; break;
149 case INT
: if (expr
->is_int()) *p_int
= (s_int
*) expr
; break;
151 s_symbol
*sym
= SX_AS_SYMBOL(expr
);
152 if (sym
!= NULL
&& strcmp(sym
->value(), literal
) == 0)
157 return *p_expr
== expr
;
161 s_match(s_expression
*top
, unsigned n
, s_pattern
*pattern
, bool partial
)
163 s_list
*list
= SX_AS_LIST(top
);
168 foreach_iter(exec_list_iterator
, it
, list
->subexpressions
) {
170 return partial
; /* More actual items than the pattern expected */
172 s_expression
*expr
= (s_expression
*) it
.get();
173 if (expr
== NULL
|| !pattern
[i
].match(expr
))
180 return false; /* Less actual items than the pattern expected */