/
handle-filters.js
144 lines (137 loc) · 4.13 KB
/
handle-filters.js
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'use strict';
var dirname = require('path').dirname;
var constantinople = require('constantinople');
var walk = require('pug-walk');
var error = require('pug-error');
var runFilter = require('./run-filter');
module.exports = handleFilters;
function handleFilters(ast, filters, options, filterAliases) {
options = options || {};
walk(
ast,
function(node) {
var dir = node.filename ? dirname(node.filename) : null;
if (node.type === 'Filter') {
handleNestedFilters(node, filters, options, filterAliases);
var text = getBodyAsText(node);
var attrs = getAttributes(node, options);
attrs.filename = node.filename;
node.type = 'Text';
node.val = filterWithFallback(node, text, attrs);
} else if (node.type === 'RawInclude' && node.filters.length) {
var firstFilter = node.filters.pop();
var attrs = getAttributes(firstFilter, options);
var filename = (attrs.filename = node.file.fullPath);
node.type = 'Text';
node.val = filterFileWithFallback(
firstFilter,
filename,
node.file,
attrs
);
node.filters
.slice()
.reverse()
.forEach(function(filter) {
var attrs = getAttributes(filter, options);
attrs.filename = filename;
node.val = filterWithFallback(filter, node.val, attrs);
});
node.filters = undefined;
node.file = undefined;
}
function filterWithFallback(filter, text, attrs, funcName) {
try {
var filterName = getFilterName(filter);
if (filters && filters[filterName]) {
return filters[filterName](text, attrs);
} else {
return runFilter(filterName, text, attrs, dir, funcName);
}
} catch (ex) {
if (ex.code === 'UNKNOWN_FILTER') {
throw error(ex.code, ex.message, filter);
}
throw ex;
}
}
function filterFileWithFallback(filter, filename, file, attrs) {
var filterName = getFilterName(filter);
if (filters && filters[filterName]) {
if (filters[filterName].renderBuffer) {
return filters[filterName].renderBuffer(file.raw, attrs);
} else {
return filters[filterName](file.str, attrs);
}
} else {
return filterWithFallback(filter, filename, attrs, 'renderFile');
}
}
},
{includeDependencies: true}
);
function getFilterName(filter) {
var filterName = filter.name;
if (filterAliases && filterAliases[filterName]) {
filterName = filterAliases[filterName];
if (filterAliases[filterName]) {
throw error(
'FILTER_ALISE_CHAIN',
'The filter "' +
filter.name +
'" is an alias for "' +
filterName +
'", which is an alias for "' +
filterAliases[filterName] +
'". Pug does not support chains of filter aliases.',
filter
);
}
}
return filterName;
}
return ast;
}
function handleNestedFilters(node, filters, options, filterAliases) {
if (node.block.nodes[0] && node.block.nodes[0].type === 'Filter') {
node.block.nodes[0] = handleFilters(
node.block,
filters,
options,
filterAliases
).nodes[0];
}
}
function getBodyAsText(node) {
return node.block.nodes
.map(function(node) {
return node.val;
})
.join('');
}
function getAttributes(node, options) {
var attrs = {};
node.attrs.forEach(function(attr) {
try {
attrs[attr.name] =
attr.val === true ? true : constantinople.toConstant(attr.val);
} catch (ex) {
if (/not constant/.test(ex.message)) {
throw error(
'FILTER_OPTION_NOT_CONSTANT',
ex.message +
' All filters are rendered compile-time so filter options must be constants.',
node
);
}
throw ex;
}
});
var opts = options[node.name] || {};
Object.keys(opts).forEach(function(opt) {
if (!attrs.hasOwnProperty(opt)) {
attrs[opt] = opts[opt];
}
});
return attrs;
}