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add :column, :nth-column, and :nth-last-column #13

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add :column, :nth-column, and :nth-last-column #13

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64 changes: 57 additions & 7 deletions lib/zest.js
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Original file line number Diff line number Diff line change
Expand Up @@ -171,6 +171,33 @@ var nth = function(param, test, last) {
};
};

/**
* Handle :column pseudo-classes
*/
function calc_cols (td, cache) {
while (td = td.parentNode) if (td.nodeName === 'TABLE') break;

var cols = td.getElementsByTagName('col')
var col_list = []
, col
, col_pos = 0
, td_pos = 1
, spans

for (; col = cols[col_pos]; col_pos++) {
spans = parseInt(col.getAttribute('span')) || 1

td_pos += spans

while (spans) {
col_list[td_pos - spans] = col
spans--
}
}

return col_list
}

/**
* Simple Selectors
*/
Expand Down Expand Up @@ -412,14 +439,37 @@ var selectors = {
':visited': function() {
throw new Error(':visited is not supported.');
},
':column': function() {
throw new Error(':column is not supported.');
},
':nth-column': function() {
throw new Error(':nth-column is not supported.');
':column': function(selector) {
var test = zest.compile(selector)

return function(el) {
if (el.parentNode.nodeType !== 1 || el.nodeName !== 'TD') return;

var rel = child(el.parentNode)
, pos = 0
, temp_pos
, cols = calc_cols(el)
, spans

while (rel) {
spans = parseInt(rel.getAttribute('span')) || 1
if (rel.nodeName === 'TD') pos += spans
if (rel === el) {
while (spans--) {
temp_pos = pos - spans
if (cols[temp_pos] && test(cols[temp_pos])) return true
}
return false;
}
rel = next(rel);
}
};
};,
':nth-column': function(param) {
return selectors[':column'](':nth-child(' + param + ')')
},
':nth-last-column': function() {
throw new Error(':nth-last-column is not supported.');
':nth-last-column': function(param) {
return selectors[':column'](':nth-last-child(' + param + ')')
},
':current': function() {
throw new Error(':current is not supported.');
Expand Down