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css parser

This commit is contained in:
Vadim Lopatin 2015-12-24 09:46:47 +03:00
parent 078763d736
commit a06585a87d
1 changed files with 172 additions and 38 deletions
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210
src/dlangui/core/css.d
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@ -177,9 +177,11 @@ enum CssValueType : ubyte {
}
/// css length value
struct CssLength {
CssValueType type = CssValueType.px; ///< type of value
struct CssValue {
int value = 0; ///< value (*256 for all types except % and px)
CssValueType type = CssValueType.px; ///< type of value
this(int px_value ) {
value = px_value;
}
@ -187,13 +189,13 @@ struct CssLength {
type = n_type;
value = n_value;
}
bool opEqual(CssLength v) const
bool opEqual(CssValue v) const
{
return type == v.type
&& value == v.value;
}
int pack() { return cast(int)type + (value<<4); }
static CssLength unpack(int v) { return CssLength(cast(CssValueType)(v & 0x0F), v >> 4); }
static const CssValue inherited = CssValue(CssValueType.inherited, 0);
}
enum CssDeclType : ubyte {
@ -246,8 +248,20 @@ class CssStyle {
CssTextAlign textAlignLast = CssTextAlign.inherit;
CssTextDecoration textDecoration = CssTextDecoration.inherit;
CssHyphenate hyphenate = CssHyphenate.inherit;
CssLength color;
CssLength backgroundColor;
CssValue color = CssValue.inherited;
CssValue backgroundColor = CssValue.inherited;
CssValue lineHeight = CssValue.inherited;
CssValue letterSpacing = CssValue.inherited;
CssValue width = CssValue.inherited;
CssValue height = CssValue.inherited;
CssValue marginLeft = CssValue.inherited;
CssValue marginRight = CssValue.inherited;
CssValue marginTop = CssValue.inherited;
CssValue marginBottom = CssValue.inherited;
CssValue paddingLeft = CssValue.inherited;
CssValue paddingRight = CssValue.inherited;
CssValue paddingTop = CssValue.inherited;
CssValue paddingBottom = CssValue.inherited;
}
/// skip spaces, move to new location, return true if there are some characters left in source line
@ -357,7 +371,10 @@ private bool nextProperty(ref string str) {
struct CssDeclItem {
CssDeclType type;
int value;
union {
int value;
CssValue length;
}
string str;
void apply(CssStyle style) {
@ -375,12 +392,8 @@ struct CssDeclItem {
style.hyphenate = cast(CssHyphenate)value;
break; // hyphenate
case color:
style.color = CssLength.unpack(value);
break;
case background_color:
style.backgroundColor = CssLength.unpack(value);
break;
case color: style.color = length; break;
case background_color: style.backgroundColor = length; break;
case vertical_align: break;
case font_family: break; // id families like serif, sans-serif
case font_names: break; // string font name like Arial, Courier
@ -390,18 +403,16 @@ struct CssDeclItem {
case text_indent: break;
case line_height: break;
case letter_spacing: break;
case width: break;
case height: break;
case margin_left: break;
case margin_right: break;
case margin_top: break;
case margin_bottom: break;
case margin: break;
case padding_left: break;
case padding_right: break;
case padding_top: break;
case padding_bottom: break;
case padding: break;
case width: style.width = length; break;
case height: style.height = length; break;
case margin_left: style.marginLeft = length; break;
case margin_right: style.marginRight = length; break;
case margin_top: style.marginTop = length; break;
case margin_bottom: style.marginBottom = length; break;
case padding_left: style.paddingLeft = length; break;
case padding_right: style.paddingRight = length; break;
case padding_top: style.paddingTop = length; break;
case padding_bottom: style.paddingBottom = length; break;
case page_break_before: break;
case page_break_after: break;
case page_break_inside: break;
@ -419,6 +430,21 @@ struct CssDeclItem {
class CssDeclaration {
private CssDeclItem[] _list;
private void addLengthDecl(CssDeclType type, CssValue len) {
CssDeclItem item;
item.type = type;
item.length = len;
_list ~= item;
}
private void addDecl(CssDeclType type, int value, string str) {
CssDeclItem item;
item.type = type;
item.value = value;
item.str = str;
_list ~= item;
}
void apply(CssStyle style) {
foreach(item; _list)
item.apply(style);
@ -448,9 +474,9 @@ class CssDeclaration {
break; // hyphenate
case color:
case background_color:
CssLength v;
CssValue v;
if (parseColor(src, v)) {
n = v.pack();
addLengthDecl(propId, v);
}
break;
case vertical_align: n = parseEnumItem!CssVerticalAlign(src, -1); break;
@ -480,11 +506,45 @@ class CssDeclaration {
case padding_right:
case padding_top:
case padding_bottom:
//n = parseEnumItem!Css(src, -1);
// parse length
CssValue value;
if (parseLength(src, value))
addLengthDecl(propId, value);
break;
case margin:
case padding:
//n = parseEnumItem!Css(src, -1);
CssValue[4] len;
int i;
for (i = 0; i < 4; ++i)
if (!parseLength(src, len[i]))
break;
if (i) {
switch (i) {
case 1:
len[1] = len[0];
goto case; /* fall through */
case 2:
len[2] = len[0];
goto case; /* fall through */
case 3:
len[3] = len[1];
break;
default:
break;
}
if (propId == margin) {
addLengthDecl(margin_left, len[0]);
addLengthDecl(margin_top, len[1]);
addLengthDecl(margin_right, len[2]);
addLengthDecl(margin_bottom, len[3]);
} else {
addLengthDecl(padding_left, len[0]);
addLengthDecl(padding_top, len[1]);
addLengthDecl(padding_right, len[2]);
addLengthDecl(padding_bottom, len[3]);
}
}
break;
case page_break_before:
case page_break_inside:
@ -502,13 +562,8 @@ class CssDeclaration {
default:
break;
}
if (n >= 0 || !s.empty) {
CssDeclItem item;
item.type = propId;
item.value = n;
item.str = s;
_list ~= item;
}
if (n >= 0 || !s.empty)
addDecl(propId, n, s);
}
if (!nextProperty(src))
break;
@ -552,7 +607,7 @@ private int parseStandardColor(string ident) {
}
}
private bool parseColor(ref string src, ref CssLength value)
private bool parseColor(ref string src, ref CssValue value)
{
value.type = CssValueType.unspecified;
value.value = 0;
@ -608,6 +663,81 @@ private bool parseColor(ref string src, ref CssLength value)
return false;
}
private bool parseLength(ref string src, ref CssValue value)
{
value.type = CssValueType.unspecified;
value.value = 0;
skipSpaces(src);
string ident = parseIdent(src);
if (!ident.empty) {
switch(ident) {
case "inherited":
value.type = CssValueType.inherited;
return true;
default:
return false;
}
}
if (src.empty)
return false;
int n = 0;
char ch = src[0];
if (ch != '.') {
if (ch < '0' || ch > '9') {
return false; // not a number
}
while (ch >= '0' && ch <= '9') {
n = n*10 + (ch - '0');
src = src[1 .. $];
if (src.empty)
break;
ch = src[0];
}
}
int frac = 0;
int frac_div = 1;
if (ch == '.') {
src = src[1 .. $];
if (!src.empty) {
ch = src[0];
while (ch >= '0' && ch <= '9') {
frac = frac*10 + (ch - '0');
frac_div *= 10;
src = src[1 .. $];
if (src.empty)
break;
ch = src[0];
}
}
}
if (ch == '%') {
value.type = CssValueType.percent;
src = src[1 .. $];
} else {
ident = parseIdent(src);
if (!ident.empty) {
switch(ident) {
case "em": value.type = CssValueType.em; break;
case "pt": value.type = CssValueType.pt; break;
case "ex": value.type = CssValueType.ex; break;
case "px": value.type = CssValueType.px; break;
case "in": value.type = CssValueType.in_; break;
case "cm": value.type = CssValueType.cm; break;
case "mm": value.type = CssValueType.mm; break;
case "pc": value.type = CssValueType.pc; break;
default:
return false;
}
} else {
value.type = CssValueType.px;
}
}
if ( value.type == CssValueType.px || value.type == CssValueType.percent )
value.value = n; // normal
else
value.value = n * 256 + 256 * frac / frac_div; // *256
return true;
}
unittest {
CssStyle style = new CssStyle();
@ -617,7 +747,7 @@ unittest {
CssTextAlign textAlignLast = CssTextAlign.inherit;
CssTextDecoration textDecoration = CssTextDecoration.inherit;
CssHyphenate hyphenate = CssHyphenate.inherit;
string src = "{ display: inline; text-decoration: underline; white-space: pre; text-align: right; text-align-last: left; hyphenate: auto }";
string src = "{ display: inline; text-decoration: underline; white-space: pre; text-align: right; text-align-last: left; hyphenate: auto; width: 70%; height: 1.5pt; margin-left: 2.0em }";
assert(decl.parse(src, true));
assert(style.display == CssDisplay.block);
assert(style.textDecoration == CssTextDecoration.inherit);
@ -625,6 +755,7 @@ unittest {
assert(style.textAlign == CssTextAlign.inherit);
assert(style.textAlignLast == CssTextAlign.inherit);
assert(style.hyphenate == CssHyphenate.inherit);
assert(style.width == CssValue.inherited);
decl.apply(style);
assert(style.display == CssDisplay.inline);
assert(style.textDecoration == CssTextDecoration.underline);
@ -632,4 +763,7 @@ unittest {
assert(style.textAlign == CssTextAlign.right);
assert(style.textAlignLast == CssTextAlign.left);
assert(style.hyphenate == CssHyphenate.auto_);
assert(style.width == CssValue(CssValueType.percent, 70));
assert(style.height == CssValue(CssValueType.pt, 1*256 + 5*256/10)); // 1.5
assert(style.marginLeft == CssValue(CssValueType.em, 2*256 + 0*256/10)); // 2.0
}