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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <string>
#include <cstdlib>
#include <cstring>
#include <cstdio> // for sprintf - for debugging
#include <minikin/CssParse.h>
#include <minikin/FontFamily.h>
using std::map;
using std::pair;
using std::string;
namespace android {
static bool strEqC(const string str, size_t off, size_t len, const char* str2) {
if (len != strlen(str2)) return false;
return !memcmp(str.data() + off, str2, len);
}
static CssTag parseTag(const string str, size_t off, size_t len) {
if (len == 0) return unknown;
char c = str[off];
if (c == 'f') {
if (strEqC(str, off, len, "font-scale-x")) return fontScaleX;
if (strEqC(str, off, len, "font-size")) return fontSize;
if (strEqC(str, off, len, "font-skew-x")) return fontSkewX;
if (strEqC(str, off, len, "font-weight")) return fontWeight;
if (strEqC(str, off, len, "font-style")) return fontStyle;
} else if (c == 'l') {
if (strEqC(str, off, len, "lang")) return cssLang;
if (strEqC(str, off, len, "letter-spacing")) return letterSpacing;
} else if (c == '-') {
if (strEqC(str, off, len, "-minikin-bidi")) return minikinBidi;
if (strEqC(str, off, len, "-minikin-hinting")) return minikinHinting;
if (strEqC(str, off, len, "-minikin-variant")) return minikinVariant;
if (strEqC(str, off, len, "-paint-flags")) return paintFlags;
}
return unknown;
}
static bool parseStringValue(const string& str, size_t* off, size_t len, CssTag tag, CssValue* v) {
const char* data = str.data();
size_t beg = *off;
if (beg == len) return false;
char first = data[beg];
bool quoted = false;
if (first == '\'' || first == '\"') {
quoted = true;
beg++;
}
size_t end;
for (end = beg; end < len; end++) {
char c = data[end];
if (quoted && c == first) {
v->setStringValue(std::string(str, beg, end - beg));
*off = end + 1;
return true;
} else if (!quoted && (c == ';' || c == ' ')) {
break;
} // TODO: deal with backslash escape, but only important for real strings
}
v->setStringValue(std::string(str, beg, end - beg));
*off = end;
return true;
}
static bool parseValue(const string& str, size_t* off, size_t len, CssTag tag, CssValue* v) {
if (tag == cssLang) {
return parseStringValue(str, off, len, tag, v);
}
const char* data = str.data();
char* endptr;
double fv = strtod(data + *off, &endptr);
if (endptr == data + *off) {
// No numeric value, try tag-specific idents
size_t end;
for (end = *off; end < len; end++) {
char c = data[end];
if (c != '-' && !(c >= 'a' && c <= 'z') &&
!(c >= '0' && c <= '9')) break;
}
size_t taglen = end - *off;
endptr += taglen;
if (tag == fontStyle) {
if (strEqC(str, *off, taglen, "normal")) {
fv = 0;
} else if (strEqC(str, *off, taglen, "italic")) {
fv = 1;
// TODO: oblique, but who really cares?
} else {
return false;
}
} else if (tag == fontWeight) {
if (strEqC(str, *off, taglen, "normal")) {
fv = 400;
} else if (strEqC(str, *off, taglen, "bold")) {
fv = 700;
} else {
return false;
}
} else if (tag == minikinVariant) {
if (strEqC(str, *off, taglen, "compact")) {
fv = VARIANT_COMPACT;
} else if (strEqC(str, *off, taglen, "elegant")) {
fv = VARIANT_ELEGANT;
}
} else {
return false;
}
}
v->setDoubleValue(fv);
*off = endptr - data;
return true;
}
string CssValue::toString(CssTag tag) const {
if (mType == DOUBLE) {
if (tag == fontStyle) {
return doubleValue ? "italic" : "normal";
} else if (tag == minikinVariant) {
if (doubleValue == VARIANT_COMPACT) return "compact";
if (doubleValue == VARIANT_ELEGANT) return "elegant";
}
char buf[64];
sprintf(buf, "%g", doubleValue);
return string(buf);
} else if (mType == STRING) {
return stringValue; // should probably quote
}
return "";
}
bool CssProperties::parse(const string& str) {
size_t len = str.size();
size_t i = 0;
while (true) {
size_t j = i;
while (j < len && str[j] == ' ') j++;
if (j == len) break;
size_t k = str.find_first_of(':', j);
if (k == string::npos) {
return false; // error: junk after end
}
CssTag tag = parseTag(str, j, k - j);
#ifdef VERBOSE
printf("parseTag result %d, ijk %lu %lu %lu\n", tag, i, j, k);
#endif
if (tag == unknown) return false; // error: unknown tag
k++; // skip over colon
while (k < len && str[k] == ' ') k++;
if (k == len) return false; // error: missing value
CssValue v;
if (!parseValue(str, &k, len, tag, &v)) break;
#ifdef VERBOSE
printf("parseValue ok\n");
#endif
mMap.insert(pair<CssTag, CssValue>(tag, v));
while (k < len && str[k] == ' ') k++;
if (k < len) {
if (str[k] != ';') return false;
k++;
}
i = k;
}
return true;
}
bool CssProperties::hasTag(CssTag tag) const {
return (mMap.find(tag) != mMap.end());
}
CssValue CssProperties::value(CssTag tag) const {
map<CssTag, CssValue>::const_iterator it = mMap.find(tag);
if (it == mMap.end()) {
CssValue unknown;
return unknown;
} else {
return it->second;
}
}
string CssProperties::toString() const {
string result;
for (map<CssTag, CssValue>::const_iterator it = mMap.begin();
it != mMap.end(); it++) {
result += cssTagNames[it->first];
result += ": ";
result += it->second.toString(it->first);
result += ";\n";
}
return result;
}
} // namespace android
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