hexo/node_modules/pug-attrs/index.js

151 lines
4.0 KiB
JavaScript

'use strict';
var assert = require('assert');
var constantinople = require('constantinople');
var runtime = require('pug-runtime');
var stringify = require('js-stringify');
function isConstant(src) {
return constantinople(src, {pug: runtime, pug_interp: undefined});
}
function toConstant(src) {
return constantinople.toConstant(src, {pug: runtime, pug_interp: undefined});
}
module.exports = compileAttrs;
/**
* options:
* - terse
* - runtime
* - format ('html' || 'object')
*/
function compileAttrs(attrs, options) {
assert(Array.isArray(attrs), 'Attrs should be an array');
assert(
attrs.every(function(attr) {
return (
attr &&
typeof attr === 'object' &&
typeof attr.name === 'string' &&
(typeof attr.val === 'string' || typeof attr.val === 'boolean') &&
typeof attr.mustEscape === 'boolean'
);
}),
'All attributes should be supplied as an object of the form {name, val, mustEscape}'
);
assert(options && typeof options === 'object', 'Options should be an object');
assert(
typeof options.terse === 'boolean',
'Options.terse should be a boolean'
);
assert(
typeof options.runtime === 'function',
'Options.runtime should be a function that takes a runtime function name and returns the source code that will evaluate to that function at runtime'
);
assert(
options.format === 'html' || options.format === 'object',
'Options.format should be "html" or "object"'
);
var buf = [];
var classes = [];
var classEscaping = [];
function addAttribute(key, val, mustEscape, buf) {
if (isConstant(val)) {
if (options.format === 'html') {
var str = stringify(
runtime.attr(key, toConstant(val), mustEscape, options.terse)
);
var last = buf[buf.length - 1];
if (last && last[last.length - 1] === str[0]) {
buf[buf.length - 1] = last.substr(0, last.length - 1) + str.substr(1);
} else {
buf.push(str);
}
} else {
val = toConstant(val);
if (mustEscape) {
val = runtime.escape(val);
}
buf.push(stringify(key) + ': ' + stringify(val));
}
} else {
if (options.format === 'html') {
buf.push(
options.runtime('attr') +
'("' +
key +
'", ' +
val +
', ' +
stringify(mustEscape) +
', ' +
stringify(options.terse) +
')'
);
} else {
if (mustEscape) {
val = options.runtime('escape') + '(' + val + ')';
}
buf.push(stringify(key) + ': ' + val);
}
}
}
attrs.forEach(function(attr) {
var key = attr.name;
var val = attr.val;
var mustEscape = attr.mustEscape;
if (key === 'class') {
classes.push(val);
classEscaping.push(mustEscape);
} else {
if (key === 'style') {
if (isConstant(val)) {
val = stringify(runtime.style(toConstant(val)));
} else {
val = options.runtime('style') + '(' + val + ')';
}
}
addAttribute(key, val, mustEscape, buf);
}
});
var classesBuf = [];
if (classes.length) {
if (classes.every(isConstant)) {
addAttribute(
'class',
stringify(runtime.classes(classes.map(toConstant), classEscaping)),
false,
classesBuf
);
} else {
classes = classes.map(function(cls, i) {
if (isConstant(cls)) {
cls = stringify(
classEscaping[i] ? runtime.escape(toConstant(cls)) : toConstant(cls)
);
classEscaping[i] = false;
}
return cls;
});
addAttribute(
'class',
options.runtime('classes') +
'([' +
classes.join(',') +
'], ' +
stringify(classEscaping) +
')',
false,
classesBuf
);
}
}
buf = classesBuf.concat(buf);
if (options.format === 'html') return buf.length ? buf.join('+') : '""';
else return '{' + buf.join(',') + '}';
}