index.js
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'use strict';
var fs = require('fs');
var path = require('path');
var walk = require('pug-walk');
var assign = require('object-assign');
module.exports = load;
function load(ast, options) {
options = getOptions(options);
// clone the ast
ast = JSON.parse(JSON.stringify(ast));
return walk(ast, function (node) {
if (node.str === undefined) {
if (node.type === 'Include' || node.type === 'RawInclude' || node.type === 'Extends') {
var file = node.file;
if (file.type !== 'FileReference') {
throw new Error('Expected file.type to be "FileReference"');
}
var path, str;
try {
path = options.resolve(file.path, file.filename, options);
file.fullPath = path;
str = options.read(path, options);
} catch (ex) {
ex.message += '\n at ' + node.filename + ' line ' + node.line;
throw ex;
}
file.str = str;
if (node.type === 'Extends' || node.type === 'Include') {
file.ast = load.string(str, assign({}, options, {
filename: path
}));
}
}
}
});
}
load.string = function loadString(src, options) {
options = assign(getOptions(options), {
src: src
});
var tokens = options.lex(src, options);
var ast = options.parse(tokens, options);
return load(ast, options);
};
load.file = function loadFile(filename, options) {
options = assign(getOptions(options), {
filename: filename
});
var str = options.read(filename);
return load.string(str, options);
};
load.resolve = function resolve(filename, source, options) {
filename = filename.trim();
if (filename[0] !== '/' && !source)
throw new Error('the "filename" option is required to use includes and extends with "relative" paths');
if (filename[0] === '/' && !options.basedir)
throw new Error('the "basedir" option is required to use includes and extends with "absolute" paths');
filename = path.join(filename[0] === '/' ? options.basedir : path.dirname(source.trim()), filename);
return filename;
};
load.read = function read(filename, options) {
return fs.readFileSync(filename, 'utf8');
};
load.validateOptions = function validateOptions(options) {
/* istanbul ignore if */
if (typeof options !== 'object') {
throw new TypeError('options must be an object');
}
/* istanbul ignore if */
if (typeof options.lex !== 'function') {
throw new TypeError('options.lex must be a function');
}
/* istanbul ignore if */
if (typeof options.parse !== 'function') {
throw new TypeError('options.parse must be a function');
}
/* istanbul ignore if */
if (options.resolve && typeof options.resolve !== 'function') {
throw new TypeError('options.resolve must be a function');
}
/* istanbul ignore if */
if (options.read && typeof options.read !== 'function') {
throw new TypeError('options.read must be a function');
}
};
function getOptions(options) {
load.validateOptions(options);
return assign({
resolve: load.resolve,
read: load.read
}, options);
}