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c20f20c | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 | import type {
Token,
HTMLNode,
TagToken,
NormalElement,
TagEndToken,
AttributeToken,
TextToken,
} from './types';
import { closingTags, closingTagAncestorBreakers, voidTags } from './tags';
interface StackItem {
tagName: string | null;
children: HTMLNode[];
}
interface State {
stack: StackItem[];
cursor: number;
tokens: Token[];
}
export const parser = (tokens: Token[]) => {
const root: StackItem = { tagName: null, children: [] };
const state: State = { tokens, cursor: 0, stack: [root] };
parse(state);
return root.children;
};
export const hasTerminalParent = (tagName: string, stack: StackItem[]) => {
const tagParents = closingTagAncestorBreakers[tagName];
if (tagParents) {
let currentIndex = stack.length - 1;
while (currentIndex >= 0) {
const parentTagName = stack[currentIndex].tagName;
if (parentTagName === tagName) break;
if (parentTagName && tagParents.includes(parentTagName)) return true;
currentIndex--;
}
}
return false;
};
export const rewindStack = (stack: StackItem[], newLength: number) => {
stack.splice(newLength);
};
export const parse = (state: State) => {
const { stack, tokens } = state;
let { cursor } = state;
let nodes = stack[stack.length - 1].children;
const len = tokens.length;
while (cursor < len) {
const token = tokens[cursor];
if (token.type !== 'tag-start') {
nodes.push(token as TextToken);
cursor++;
continue;
}
const tagToken = tokens[++cursor] as TagToken;
cursor++;
const tagName = tagToken.content.toLowerCase();
if (token.close) {
let index = stack.length;
let shouldRewind = false;
while (--index > -1) {
if (stack[index].tagName === tagName) {
shouldRewind = true;
break;
}
}
while (cursor < len) {
if (tokens[cursor].type !== 'tag-end') break;
cursor++;
}
if (shouldRewind) {
rewindStack(stack, index);
break;
} else continue;
}
const isClosingTag = closingTags.includes(tagName);
let shouldRewindToAutoClose = isClosingTag;
if (shouldRewindToAutoClose) {
shouldRewindToAutoClose = !hasTerminalParent(tagName, stack);
}
if (shouldRewindToAutoClose) {
let currentIndex = stack.length - 1;
while (currentIndex > 0) {
if (tagName === stack[currentIndex].tagName) {
rewindStack(stack, currentIndex);
const previousIndex = currentIndex - 1;
nodes = stack[previousIndex].children;
break;
}
currentIndex = currentIndex - 1;
}
}
const attributes = [];
let tagEndToken: TagEndToken | undefined;
while (cursor < len) {
const _token = tokens[cursor];
if (_token.type === 'tag-end') {
tagEndToken = _token;
break;
}
attributes.push((_token as AttributeToken).content);
cursor++;
}
if (!tagEndToken) break;
cursor++;
const children: HTMLNode[] = [];
const elementNode: NormalElement = {
type: 'element',
tagName: tagToken.content,
attributes,
children,
};
nodes.push(elementNode);
const hasChildren = !(tagEndToken.close || voidTags.includes(tagName));
if (hasChildren) {
stack.push({ tagName, children });
const innerState = { tokens, cursor, stack };
parse(innerState);
cursor = innerState.cursor;
}
}
state.cursor = cursor;
};
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