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/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkParse.h"
#include <stdlib.h>
static inline bool is_between(int c, int min, int max)
{
return (unsigned)(c - min) <= (unsigned)(max - min);
}
static inline bool is_ws(int c)
{
return is_between(c, 1, 32);
}
static inline bool is_digit(int c)
{
return is_between(c, '0', '9');
}
static inline bool is_sep(int c)
{
return is_ws(c) || c == ',' || c == ';';
}
static int to_hex(int c)
{
if (is_digit(c))
return c - '0';
c |= 0x20; // make us lower-case
if (is_between(c, 'a', 'f'))
return c + 10 - 'a';
else
return -1;
}
static inline bool is_hex(int c)
{
return to_hex(c) >= 0;
}
static const char* skip_ws(const char str[])
{
SkASSERT(str);
while (is_ws(*str))
str++;
return str;
}
static const char* skip_sep(const char str[])
{
SkASSERT(str);
while (is_sep(*str))
str++;
return str;
}
int SkParse::Count(const char str[])
{
char c;
int count = 0;
goto skipLeading;
do {
count++;
do {
if ((c = *str++) == '\0')
goto goHome;
} while (is_sep(c) == false);
skipLeading:
do {
if ((c = *str++) == '\0')
goto goHome;
} while (is_sep(c));
} while (true);
goHome:
return count;
}
int SkParse::Count(const char str[], char separator)
{
char c;
int count = 0;
goto skipLeading;
do {
count++;
do {
if ((c = *str++) == '\0')
goto goHome;
} while (c != separator);
skipLeading:
do {
if ((c = *str++) == '\0')
goto goHome;
} while (c == separator);
} while (true);
goHome:
return count;
}
const char* SkParse::FindHex(const char str[], uint32_t* value)
{
SkASSERT(str);
str = skip_ws(str);
if (!is_hex(*str))
return nullptr;
uint32_t n = 0;
int max_digits = 8;
int digit;
while ((digit = to_hex(*str)) >= 0)
{
if (--max_digits < 0)
return nullptr;
n = (n << 4) | digit;
str += 1;
}
if (*str == 0 || is_ws(*str))
{
if (value)
*value = n;
return str;
}
return nullptr;
}
const char* SkParse::FindS32(const char str[], int32_t* value)
{
SkASSERT(str);
str = skip_ws(str);
int sign = 0;
if (*str == '-')
{
sign = -1;
str += 1;
}
if (!is_digit(*str))
return nullptr;
int n = 0;
while (is_digit(*str))
{
n = 10*n + *str - '0';
str += 1;
}
if (value)
*value = (n ^ sign) - sign;
return str;
}
const char* SkParse::FindMSec(const char str[], SkMSec* value)
{
SkASSERT(str);
str = skip_ws(str);
int sign = 0;
if (*str == '-')
{
sign = -1;
str += 1;
}
if (!is_digit(*str))
return nullptr;
int n = 0;
while (is_digit(*str))
{
n = 10*n + *str - '0';
str += 1;
}
int remaining10s = 3;
if (*str == '.') {
str++;
while (is_digit(*str))
{
n = 10*n + *str - '0';
str += 1;
if (--remaining10s == 0)
break;
}
}
while (--remaining10s >= 0)
n *= 10;
if (value)
*value = (n ^ sign) - sign;
return str;
}
const char* SkParse::FindScalar(const char str[], SkScalar* value) {
SkASSERT(str);
str = skip_ws(str);
char* stop;
float v = (float)strtod(str, &stop);
if (str == stop) {
return nullptr;
}
if (value) {
*value = v;
}
return stop;
}
const char* SkParse::FindScalars(const char str[], SkScalar value[], int count)
{
SkASSERT(count >= 0);
if (count > 0)
{
for (;;)
{
str = SkParse::FindScalar(str, value);
if (--count == 0 || str == nullptr)
break;
// keep going
str = skip_sep(str);
if (value)
value += 1;
}
}
return str;
}
static bool lookup_str(const char str[], const char** table, int count)
{
while (--count >= 0)
if (!strcmp(str, table[count]))
return true;
return false;
}
bool SkParse::FindBool(const char str[], bool* value)
{
static const char* gYes[] = { "yes", "1", "true" };
static const char* gNo[] = { "no", "0", "false" };
if (lookup_str(str, gYes, SK_ARRAY_COUNT(gYes)))
{
if (value) *value = true;
return true;
}
else if (lookup_str(str, gNo, SK_ARRAY_COUNT(gNo)))
{
if (value) *value = false;
return true;
}
return false;
}
int SkParse::FindList(const char target[], const char list[])
{
size_t len = strlen(target);
int index = 0;
for (;;)
{
const char* end = strchr(list, ',');
size_t entryLen;
if (end == nullptr) // last entry
entryLen = strlen(list);
else
entryLen = end - list;
if (entryLen == len && memcmp(target, list, len) == 0)
return index;
if (end == nullptr)
break;
list = end + 1; // skip the ','
index += 1;
}
return -1;
}
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