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 王天杨
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import {COMMENT, RULESET, DECLARATION} from './Enum.js'
import {abs, charat, trim, from, sizeof, strlen, substr, append, replace, indexof} from './Utility.js'
import {node, char, prev, next, peek, caret, alloc, dealloc, delimit, whitespace, escaping, identifier, commenter} from './Tokenizer.js'
/**
* @param {string} value
* @return {object[]}
*/
export function compile (value) {
return dealloc(parse('', null, null, null, [''], value = alloc(value), 0, [0], value))
}
/**
* @param {string} value
* @param {object} root
* @param {object?} parent
* @param {string[]} rule
* @param {string[]} rules
* @param {string[]} rulesets
* @param {number[]} pseudo
* @param {number[]} points
* @param {string[]} declarations
* @return {object}
*/
export function parse (value, root, parent, rule, rules, rulesets, pseudo, points, declarations) {
var index = 0
var offset = 0
var length = pseudo
var atrule = 0
var property = 0
var previous = 0
var variable = 1
var scanning = 1
var ampersand = 1
var character = 0
var type = ''
var props = rules
var children = rulesets
var reference = rule
var characters = type
while (scanning)
switch (previous = character, character = next()) {
// (
case 40:
if (previous != 108 && charat(characters, length - 1) == 58) {
if (indexof(characters += replace(delimit(character), '&', '&\f'), '&\f') != -1)
ampersand = -1
break
}
// " ' [
case 34: case 39: case 91:
characters += delimit(character)
break
// \t \n \r \s
case 9: case 10: case 13: case 32:
characters += whitespace(previous)
break
// \
case 92:
characters += escaping(caret() - 1, 7)
continue
// /
case 47:
switch (peek()) {
case 42: case 47:
append(comment(commenter(next(), caret()), root, parent), declarations)
break
default:
characters += '/'
}
break
// {
case 123 * variable:
points[index++] = strlen(characters) * ampersand
// } ; \0
case 125 * variable: case 59: case 0:
switch (character) {
// \0 }
case 0: case 125: scanning = 0
// ;
case 59 + offset: if (ampersand == -1) characters = replace(characters, /\f/g, '')
if (property > 0 && (strlen(characters) - length))
append(property > 32 ? declaration(characters + ';', rule, parent, length - 1) : declaration(replace(characters, ' ', '') + ';', rule, parent, length - 2), declarations)
break
// @ ;
case 59: characters += ';'
// { rule/at-rule
default:
append(reference = ruleset(characters, root, parent, index, offset, rules, points, type, props = [], children = [], length), rulesets)
if (character === 123)
if (offset === 0)
parse(characters, root, reference, reference, props, rulesets, length, points, children)
else
switch (atrule === 99 && charat(characters, 3) === 110 ? 100 : atrule) {
// d l m s
case 100: case 108: case 109: case 115:
parse(value, reference, reference, rule && append(ruleset(value, reference, reference, 0, 0, rules, points, type, rules, props = [], length), children), rules, children, length, points, rule ? props : children)
break
default:
parse(characters, reference, reference, reference, [''], children, 0, points, children)
}
}
index = offset = property = 0, variable = ampersand = 1, type = characters = '', length = pseudo
break
// :
case 58:
length = 1 + strlen(characters), property = previous
default:
if (variable < 1)
if (character == 123)
--variable
else if (character == 125 && variable++ == 0 && prev() == 125)
continue
switch (characters += from(character), character * variable) {
// &
case 38:
ampersand = offset > 0 ? 1 : (characters += '\f', -1)
break
// ,
case 44:
points[index++] = (strlen(characters) - 1) * ampersand, ampersand = 1
break
// @
case 64:
// -
if (peek() === 45)
characters += delimit(next())
atrule = peek(), offset = length = strlen(type = characters += identifier(caret())), character++
break
// -
case 45:
if (previous === 45 && strlen(characters) == 2)
variable = 0
}
}
return rulesets
}
/**
* @param {string} value
* @param {object} root
* @param {object?} parent
* @param {number} index
* @param {number} offset
* @param {string[]} rules
* @param {number[]} points
* @param {string} type
* @param {string[]} props
* @param {string[]} children
* @param {number} length
* @return {object}
*/
export function ruleset (value, root, parent, index, offset, rules, points, type, props, children, length) {
var post = offset - 1
var rule = offset === 0 ? rules : ['']
var size = sizeof(rule)
for (var i = 0, j = 0, k = 0; i < index; ++i)
for (var x = 0, y = substr(value, post + 1, post = abs(j = points[i])), z = value; x < size; ++x)
if (z = trim(j > 0 ? rule[x] + ' ' + y : replace(y, /&\f/g, rule[x])))
props[k++] = z
return node(value, root, parent, offset === 0 ? RULESET : type, props, children, length)
}
/**
* @param {number} value
* @param {object} root
* @param {object?} parent
* @return {object}
*/
export function comment (value, root, parent) {
return node(value, root, parent, COMMENT, from(char()), substr(value, 2, -2), 0)
}
/**
* @param {string} value
* @param {object} root
* @param {object?} parent
* @param {number} length
* @return {object}
*/
export function declaration (value, root, parent, length) {
return node(value, root, parent, DECLARATION, substr(value, 0, length), substr(value, length + 1, -1), length)
}
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