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Copy pathparser.ts
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1043 lines (932 loc) · 35.2 KB
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/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.dev/license
*/
import {ParseError, ParseLocation, ParseSourceSpan} from '../parse_util';
import * as html from './ast';
import {NAMED_ENTITIES} from './entities';
import {tokenize, TokenizeOptions} from './lexer';
import {getNsPrefix, mergeNsAndName, splitNsName, TagDefinition} from './tags';
import {
AttributeNameToken,
AttributeQuoteToken,
BlockCloseToken,
BlockOpenStartToken,
BlockParameterToken,
CdataStartToken,
CommentStartToken,
ComponentCloseToken,
ComponentOpenStartToken,
DirectiveNameToken,
ExpansionCaseExpressionEndToken,
ExpansionCaseExpressionStartToken,
ExpansionCaseValueToken,
ExpansionFormStartToken,
IncompleteBlockOpenToken,
IncompleteComponentOpenToken,
IncompleteLetToken,
IncompleteTagOpenToken,
InElementCommentToken,
InterpolatedAttributeToken,
InterpolatedTextToken,
LetEndToken,
LetStartToken,
LetValueToken,
TagCloseToken,
TagOpenStartToken,
TextToken,
Token,
TokenType,
} from './tokens';
/** Nodes that can contain other nodes. */
type NodeContainer = html.Element | html.Block | html.Component;
/** Class that can construct a `NodeContainer`. */
interface NodeContainerConstructor extends Function {
new (...args: any[]): NodeContainer;
}
export class TreeError extends ParseError {
static create(elementName: string | null, span: ParseSourceSpan, msg: string): TreeError {
return new TreeError(elementName, span, msg);
}
constructor(
public elementName: string | null,
span: ParseSourceSpan,
msg: string,
) {
super(span, msg);
}
}
export class ParseTreeResult {
constructor(
public rootNodes: html.Node[],
public errors: ParseError[],
) {}
}
export class Parser {
constructor(public getTagDefinition: (tagName: string) => TagDefinition) {}
parse(source: string, url: string, options?: TokenizeOptions): ParseTreeResult {
const tokenizeResult = tokenize(source, url, this.getTagDefinition, options);
const parser = new _TreeBuilder(tokenizeResult.tokens, this.getTagDefinition);
parser.build();
return new ParseTreeResult(parser.rootNodes, [...tokenizeResult.errors, ...parser.errors]);
}
}
class _TreeBuilder {
private _index: number = -1;
// `_peek` will be initialized by the call to `_advance()` in the constructor.
private _peek!: Token;
private _containerStack: NodeContainer[] = [];
rootNodes: html.Node[] = [];
errors: TreeError[] = [];
constructor(
private tokens: Token[],
private tagDefinitionResolver: (tagName: string) => TagDefinition,
) {
this._advance();
}
build(): void {
while (this._peek.type !== TokenType.EOF) {
if (
this._peek.type === TokenType.TAG_OPEN_START ||
this._peek.type === TokenType.INCOMPLETE_TAG_OPEN
) {
this._consumeElementStartTag(this._advance());
} else if (this._peek.type === TokenType.TAG_CLOSE) {
this._consumeElementEndTag(this._advance());
} else if (this._peek.type === TokenType.CDATA_START) {
this._closeVoidElement();
this._consumeCdata(this._advance());
} else if (this._peek.type === TokenType.COMMENT_START) {
this._closeVoidElement();
this._consumeComment(this._advance());
} else if (
this._peek.type === TokenType.TEXT ||
this._peek.type === TokenType.RAW_TEXT ||
this._peek.type === TokenType.ESCAPABLE_RAW_TEXT
) {
this._closeVoidElement();
this._consumeText(this._advance());
} else if (this._peek.type === TokenType.EXPANSION_FORM_START) {
this._consumeExpansion(this._advance());
} else if (this._peek.type === TokenType.BLOCK_OPEN_START) {
this._closeVoidElement();
this._consumeBlockOpen(this._advance());
} else if (this._peek.type === TokenType.BLOCK_CLOSE) {
this._closeVoidElement();
this._consumeBlockClose(this._advance());
} else if (this._peek.type === TokenType.INCOMPLETE_BLOCK_OPEN) {
this._closeVoidElement();
this._consumeIncompleteBlock(this._advance());
} else if (this._peek.type === TokenType.LET_START) {
this._closeVoidElement();
this._consumeLet(this._advance());
} else if (this._peek.type === TokenType.INCOMPLETE_LET) {
this._closeVoidElement();
this._consumeIncompleteLet(this._advance());
} else if (
this._peek.type === TokenType.COMPONENT_OPEN_START ||
this._peek.type === TokenType.INCOMPLETE_COMPONENT_OPEN
) {
this._consumeComponentStartTag(this._advance());
} else if (this._peek.type === TokenType.COMPONENT_CLOSE) {
this._consumeComponentEndTag(this._advance());
} else {
// Skip all other tokens...
this._advance();
}
}
for (const leftoverContainer of this._containerStack) {
// Unlike HTML elements, blocks aren't closed implicitly by the end of the file.
if (leftoverContainer instanceof html.Block) {
this.errors.push(
TreeError.create(
leftoverContainer.name,
leftoverContainer.sourceSpan,
`Unclosed block "${leftoverContainer.name}"`,
),
);
}
}
}
private _advance<T extends Token>(): T {
const prev = this._peek;
if (this._index < this.tokens.length - 1) {
// Note: there is always an EOF token at the end
this._index++;
}
this._peek = this.tokens[this._index];
return prev as T;
}
private _advanceIf<T extends TokenType>(type: T): (Token & {type: T}) | null {
if (this._peek.type === type) {
return this._advance<Token & {type: T}>();
}
return null;
}
private _consumeCdata(_startToken: CdataStartToken) {
this._consumeText(this._advance<TextToken>());
this._advanceIf(TokenType.CDATA_END);
}
private _consumeComment(token: CommentStartToken) {
const text = this._advanceIf(TokenType.RAW_TEXT);
const endToken = this._advanceIf(TokenType.COMMENT_END);
const value = text != null ? text.parts[0].trim() : null;
const sourceSpan =
endToken == null
? token.sourceSpan
: new ParseSourceSpan(
token.sourceSpan.start,
endToken.sourceSpan.end,
token.sourceSpan.fullStart,
);
this._addToParent(new html.Comment(value, sourceSpan));
}
private _consumeExpansion(token: ExpansionFormStartToken) {
const switchValue = this._advance<TextToken>();
const type = this._advance<TextToken>();
const cases: html.ExpansionCase[] = [];
// read =
while (this._peek.type === TokenType.EXPANSION_CASE_VALUE) {
const expCase = this._parseExpansionCase();
if (!expCase) return; // error
cases.push(expCase);
}
// read the final }
if (this._peek.type !== TokenType.EXPANSION_FORM_END) {
this.errors.push(
TreeError.create(null, this._peek.sourceSpan, `Invalid ICU message. Missing '}'.`),
);
return;
}
const sourceSpan = new ParseSourceSpan(
token.sourceSpan.start,
this._peek.sourceSpan.end,
token.sourceSpan.fullStart,
);
this._addToParent(
new html.Expansion(
switchValue.parts[0],
type.parts[0],
cases,
sourceSpan,
switchValue.sourceSpan,
),
);
this._advance();
}
private _parseExpansionCase(): html.ExpansionCase | null {
const value = this._advance<ExpansionCaseValueToken>();
// read {
if (this._peek.type !== TokenType.EXPANSION_CASE_EXP_START) {
this.errors.push(
TreeError.create(null, this._peek.sourceSpan, `Invalid ICU message. Missing '{'.`),
);
return null;
}
// read until }
const start = this._advance<ExpansionCaseExpressionStartToken>();
const exp = this._collectExpansionExpTokens(start);
if (!exp) return null;
const end = this._advance<ExpansionCaseExpressionEndToken>();
exp.push({type: TokenType.EOF, parts: [], sourceSpan: end.sourceSpan});
// parse everything in between { and }
const expansionCaseParser = new _TreeBuilder(exp, this.tagDefinitionResolver);
expansionCaseParser.build();
if (expansionCaseParser.errors.length > 0) {
this.errors = this.errors.concat(expansionCaseParser.errors);
return null;
}
const sourceSpan = new ParseSourceSpan(
value.sourceSpan.start,
end.sourceSpan.end,
value.sourceSpan.fullStart,
);
const expSourceSpan = new ParseSourceSpan(
start.sourceSpan.start,
end.sourceSpan.end,
start.sourceSpan.fullStart,
);
return new html.ExpansionCase(
value.parts[0],
expansionCaseParser.rootNodes,
sourceSpan,
value.sourceSpan,
expSourceSpan,
);
}
private _collectExpansionExpTokens(start: Token): Token[] | null {
const exp: Token[] = [];
const expansionFormStack = [TokenType.EXPANSION_CASE_EXP_START];
while (true) {
if (
this._peek.type === TokenType.EXPANSION_FORM_START ||
this._peek.type === TokenType.EXPANSION_CASE_EXP_START
) {
expansionFormStack.push(this._peek.type);
}
if (this._peek.type === TokenType.EXPANSION_CASE_EXP_END) {
if (lastOnStack(expansionFormStack, TokenType.EXPANSION_CASE_EXP_START)) {
expansionFormStack.pop();
if (expansionFormStack.length === 0) return exp;
} else {
this.errors.push(
TreeError.create(null, start.sourceSpan, `Invalid ICU message. Missing '}'.`),
);
return null;
}
}
if (this._peek.type === TokenType.EXPANSION_FORM_END) {
if (lastOnStack(expansionFormStack, TokenType.EXPANSION_FORM_START)) {
expansionFormStack.pop();
} else {
this.errors.push(
TreeError.create(null, start.sourceSpan, `Invalid ICU message. Missing '}'.`),
);
return null;
}
}
if (this._peek.type === TokenType.EOF) {
this.errors.push(
TreeError.create(null, start.sourceSpan, `Invalid ICU message. Missing '}'.`),
);
return null;
}
exp.push(this._advance());
}
}
private _consumeText(token: InterpolatedTextToken) {
const tokens = [token];
const startSpan = token.sourceSpan;
let text = token.parts[0];
if (text.length > 0 && text[0] === '\n') {
const parent = this._getContainer();
if (
parent != null &&
parent.children.length === 0 &&
this._getTagDefinition(parent)?.ignoreFirstLf
) {
text = text.substring(1);
tokens[0] = {type: token.type, sourceSpan: token.sourceSpan, parts: [text]} as typeof token;
}
}
while (
this._peek.type === TokenType.INTERPOLATION ||
this._peek.type === TokenType.TEXT ||
this._peek.type === TokenType.ENCODED_ENTITY
) {
token = this._advance();
tokens.push(token);
if (token.type === TokenType.INTERPOLATION) {
// For backward compatibility we decode HTML entities that appear in interpolation
// expressions. This is arguably a bug, but it could be a considerable breaking change to
// fix it. It should be addressed in a larger project to refactor the entire parser/lexer
// chain after View Engine has been removed.
text += token.parts.join('').replace(/&([^;]+);/g, decodeEntity);
} else if (token.type === TokenType.ENCODED_ENTITY) {
text += token.parts[0];
} else {
text += token.parts.join('');
}
}
if (text.length > 0) {
const endSpan = token.sourceSpan;
this._addToParent(
new html.Text(
text,
new ParseSourceSpan(startSpan.start, endSpan.end, startSpan.fullStart, startSpan.details),
tokens,
),
);
}
}
private _closeVoidElement(): void {
const el = this._getContainer();
if (el !== null && this._getTagDefinition(el)?.isVoid) {
this._containerStack.pop();
}
}
private _consumeElementStartTag(startTagToken: TagOpenStartToken | IncompleteTagOpenToken) {
const attrs: html.Attribute[] = [];
const directives: html.Directive[] = [];
const comments: html.StartTagComment[] = [];
this._consumeAttributesAndDirectives(attrs, directives, comments);
const fullName = this._getElementFullName(startTagToken, this._getClosestElementLikeParent());
const tagDef = this._getTagDefinition(fullName);
let selfClosing = false;
// Note: There could have been a tokenizer error
// so that we don't get a token for the end tag...
if (this._peek.type === TokenType.TAG_OPEN_END_VOID) {
this._advance();
selfClosing = true;
if (!(tagDef?.canSelfClose || getNsPrefix(fullName) !== null || tagDef?.isVoid)) {
this.errors.push(
TreeError.create(
fullName,
startTagToken.sourceSpan,
`Only void, custom and foreign elements can be self closed "${startTagToken.parts[1]}"`,
),
);
}
} else if (this._peek.type === TokenType.TAG_OPEN_END) {
this._advance();
selfClosing = false;
}
const end = this._peek.sourceSpan.fullStart;
const span = new ParseSourceSpan(
startTagToken.sourceSpan.start,
end,
startTagToken.sourceSpan.fullStart,
);
// Create a separate `startSpan` because `span` will be modified when there is an `end` span.
const startSpan = new ParseSourceSpan(
startTagToken.sourceSpan.start,
end,
startTagToken.sourceSpan.fullStart,
);
const el = new html.Element(
fullName,
attrs,
directives,
[],
selfClosing,
span,
startSpan,
undefined,
tagDef?.isVoid ?? false,
undefined,
comments,
);
const parent = this._getContainer();
const isClosedByChild =
parent !== null && !!this._getTagDefinition(parent)?.isClosedByChild(el.name);
this._pushContainer(el, isClosedByChild);
if (selfClosing) {
// Elements that are self-closed have their `endSourceSpan` set to the full span, as the
// element start tag also represents the end tag.
this._popContainer(fullName, html.Element, span);
} else if (startTagToken.type === TokenType.INCOMPLETE_TAG_OPEN) {
// We already know the opening tag is not complete, so it is unlikely it has a corresponding
// close tag. Let's optimistically parse it as a full element and emit an error.
this._popContainer(fullName, html.Element, null);
this.errors.push(
TreeError.create(fullName, span, `Opening tag "${fullName}" not terminated.`),
);
}
}
private _consumeComponentStartTag(
startToken: ComponentOpenStartToken | IncompleteComponentOpenToken,
) {
const componentName = startToken.parts[0];
const attrs: html.Attribute[] = [];
const directives: html.Directive[] = [];
const comments: html.StartTagComment[] = [];
this._consumeAttributesAndDirectives(attrs, directives, comments);
const closestElement = this._getClosestElementLikeParent();
const tagName = this._getComponentTagName(startToken, closestElement);
const fullName = this._getComponentFullName(startToken, closestElement);
const selfClosing = this._peek.type === TokenType.COMPONENT_OPEN_END_VOID;
this._advance();
const end = this._peek.sourceSpan.fullStart;
const span = new ParseSourceSpan(
startToken.sourceSpan.start,
end,
startToken.sourceSpan.fullStart,
);
const startSpan = new ParseSourceSpan(
startToken.sourceSpan.start,
end,
startToken.sourceSpan.fullStart,
);
const node = new html.Component(
componentName,
tagName,
fullName,
attrs,
directives,
[],
selfClosing,
span,
startSpan,
undefined,
undefined,
comments,
);
const parent = this._getContainer();
const isClosedByChild =
parent !== null &&
node.tagName !== null &&
!!this._getTagDefinition(parent)?.isClosedByChild(node.tagName);
this._pushContainer(node, isClosedByChild);
if (selfClosing) {
this._popContainer(fullName, html.Component, span);
} else if (startToken.type === TokenType.INCOMPLETE_COMPONENT_OPEN) {
this._popContainer(fullName, html.Component, null);
this.errors.push(
TreeError.create(fullName, span, `Opening tag "${fullName}" not terminated.`),
);
}
}
private _consumeAttributesAndDirectives(
attributesResult: html.Attribute[],
directivesResult: html.Directive[],
commentsResult: html.StartTagComment[],
) {
while (
this._peek.type === TokenType.ATTR_NAME ||
this._peek.type === TokenType.DIRECTIVE_NAME ||
this._peek.type === TokenType.IN_ELEMENT_COMMENT
) {
if (this._peek.type === TokenType.DIRECTIVE_NAME) {
directivesResult.push(this._consumeDirective(this._peek));
} else if (this._peek.type === TokenType.ATTR_NAME) {
attributesResult.push(this._consumeAttr(this._advance<AttributeNameToken>()));
} else {
const commentToken = this._advance<InElementCommentToken>();
commentsResult.push(
new html.StartTagComment(
commentToken.parts[0],
commentToken.parts[1],
commentToken.sourceSpan,
),
);
}
}
}
private _consumeComponentEndTag(endToken: ComponentCloseToken) {
const fullName = this._getComponentFullName(endToken, this._getClosestElementLikeParent());
if (!this._popContainer(fullName, html.Component, endToken.sourceSpan)) {
const container = this._containerStack[this._containerStack.length - 1];
let suffix: string;
if (container instanceof html.Component && container.componentName === endToken.parts[0]) {
suffix = `, did you mean "${container.fullName}"?`;
} else {
suffix = '. It may happen when the tag has already been closed by another tag.';
}
const errMsg = `Unexpected closing tag "${fullName}"${suffix}`;
this.errors.push(TreeError.create(fullName, endToken.sourceSpan, errMsg));
}
}
private _getTagDefinition(nodeOrName: html.Node | string): TagDefinition | null {
if (typeof nodeOrName === 'string') {
return this.tagDefinitionResolver(nodeOrName);
} else if (nodeOrName instanceof html.Element) {
return this.tagDefinitionResolver(nodeOrName.name);
} else if (nodeOrName instanceof html.Component && nodeOrName.tagName !== null) {
return this.tagDefinitionResolver(nodeOrName.tagName);
} else {
return null;
}
}
private _pushContainer(node: NodeContainer, isClosedByChild: boolean) {
if (isClosedByChild) {
this._containerStack.pop();
}
this._addToParent(node);
this._containerStack.push(node);
}
private _consumeElementEndTag(endTagToken: TagCloseToken) {
const fullName = this._getElementFullName(endTagToken, this._getClosestElementLikeParent());
if (this._getTagDefinition(fullName)?.isVoid) {
this.errors.push(
TreeError.create(
fullName,
endTagToken.sourceSpan,
`Void elements do not have end tags "${endTagToken.parts[1]}"`,
),
);
} else if (!this._popContainer(fullName, html.Element, endTagToken.sourceSpan)) {
const errMsg = `Unexpected closing tag "${fullName}". It may happen when the tag has already been closed by another tag. For more info see https://www.w3.org/TR/html5/syntax.html#closing-elements-that-have-implied-end-tags`;
this.errors.push(TreeError.create(fullName, endTagToken.sourceSpan, errMsg));
}
}
/**
* Closes the nearest element with the tag name `fullName` in the parse tree.
* `endSourceSpan` is the span of the closing tag, or null if the element does
* not have a closing tag (for example, this happens when an incomplete
* opening tag is recovered).
*/
private _popContainer(
expectedName: string | null,
expectedType: NodeContainerConstructor,
endSourceSpan: ParseSourceSpan | null,
): boolean {
let unexpectedCloseTagDetected = false;
for (let stackIndex = this._containerStack.length - 1; stackIndex >= 0; stackIndex--) {
const node = this._containerStack[stackIndex];
const nodeName = node instanceof html.Component ? node.fullName : node.name;
if ((nodeName === expectedName || expectedName === null) && node instanceof expectedType) {
// Record the parse span with the element that is being closed. Any elements that are
// removed from the element stack at this point are closed implicitly, so they won't get
// an end source span (as there is no explicit closing element).
node.endSourceSpan = endSourceSpan;
node.sourceSpan.end = endSourceSpan !== null ? endSourceSpan.end : node.sourceSpan.end;
this._containerStack.splice(stackIndex, this._containerStack.length - stackIndex);
return !unexpectedCloseTagDetected;
}
// Blocks and most elements are not self closing.
if (node instanceof html.Block || !this._getTagDefinition(node)?.closedByParent) {
// Note that we encountered an unexpected close tag but continue processing the element
// stack so we can assign an `endSourceSpan` if there is a corresponding start tag for this
// end tag in the stack.
unexpectedCloseTagDetected = true;
}
}
return false;
}
private _consumeAttr(attrName: AttributeNameToken): html.Attribute {
const fullName = mergeNsAndName(attrName.parts[0], attrName.parts[1]);
let attrEnd = attrName.sourceSpan.end;
// Consume any quote
if (this._peek.type === TokenType.ATTR_QUOTE) {
this._advance();
}
// Consume the attribute value
let value = '';
const valueTokens: InterpolatedAttributeToken[] = [];
let valueStartSpan: ParseSourceSpan | undefined = undefined;
let valueEnd: ParseLocation | undefined = undefined;
// NOTE: We need to use a new variable `nextTokenType` here to hide the actual type of
// `_peek.type` from TS. Otherwise TS will narrow the type of `_peek.type` preventing it from
// being able to consider `ATTR_VALUE_INTERPOLATION` as an option. This is because TS is not
// able to see that `_advance()` will actually mutate `_peek`.
const nextTokenType = this._peek.type as TokenType;
if (nextTokenType === TokenType.ATTR_VALUE_TEXT) {
valueStartSpan = this._peek.sourceSpan;
valueEnd = this._peek.sourceSpan.end;
while (
this._peek.type === TokenType.ATTR_VALUE_TEXT ||
this._peek.type === TokenType.ATTR_VALUE_INTERPOLATION ||
this._peek.type === TokenType.ENCODED_ENTITY
) {
const valueToken = this._advance<InterpolatedAttributeToken>();
valueTokens.push(valueToken);
if (valueToken.type === TokenType.ATTR_VALUE_INTERPOLATION) {
// For backward compatibility we decode HTML entities that appear in interpolation
// expressions. This is arguably a bug, but it could be a considerable breaking change to
// fix it. It should be addressed in a larger project to refactor the entire parser/lexer
// chain after View Engine has been removed.
value += valueToken.parts.join('').replace(/&([^;]+);/g, decodeEntity);
} else if (valueToken.type === TokenType.ENCODED_ENTITY) {
value += valueToken.parts[0];
} else {
value += valueToken.parts.join('');
}
valueEnd = attrEnd = valueToken.sourceSpan.end;
}
}
// Consume any quote
if (this._peek.type === TokenType.ATTR_QUOTE) {
const quoteToken = this._advance<AttributeQuoteToken>();
attrEnd = quoteToken.sourceSpan.end;
}
const valueSpan =
valueStartSpan &&
valueEnd &&
new ParseSourceSpan(valueStartSpan.start, valueEnd, valueStartSpan.fullStart);
return new html.Attribute(
fullName,
value,
new ParseSourceSpan(attrName.sourceSpan.start, attrEnd, attrName.sourceSpan.fullStart),
attrName.sourceSpan,
valueSpan,
valueTokens.length > 0 ? valueTokens : undefined,
undefined,
);
}
private _consumeDirective(nameToken: DirectiveNameToken): html.Directive {
const attributes: html.Attribute[] = [];
let startSourceSpanEnd: ParseLocation = nameToken.sourceSpan.end;
let endSourceSpan: ParseSourceSpan | null = null;
this._advance();
if (this._peek.type === TokenType.DIRECTIVE_OPEN) {
// Capture the opening token in the start span.
startSourceSpanEnd = this._peek.sourceSpan.end;
this._advance();
// Cast here is necessary, because TS doesn't know that `_advance` changed `_peek`.
while ((this._peek as Token).type === TokenType.ATTR_NAME) {
attributes.push(this._consumeAttr(this._advance<AttributeNameToken>()));
}
if ((this._peek as Token).type === TokenType.DIRECTIVE_CLOSE) {
endSourceSpan = this._peek.sourceSpan;
this._advance();
} else {
this.errors.push(
TreeError.create(null, nameToken.sourceSpan, 'Unterminated directive definition'),
);
}
}
const startSourceSpan = new ParseSourceSpan(
nameToken.sourceSpan.start,
startSourceSpanEnd,
nameToken.sourceSpan.fullStart,
);
const sourceSpan = new ParseSourceSpan(
startSourceSpan.start,
endSourceSpan === null ? nameToken.sourceSpan.end : endSourceSpan.end,
startSourceSpan.fullStart,
);
return new html.Directive(
nameToken.parts[0],
attributes,
sourceSpan,
startSourceSpan,
endSourceSpan,
);
}
private _consumeBlockOpen(token: BlockOpenStartToken) {
const parameters: html.BlockParameter[] = [];
while (this._peek.type === TokenType.BLOCK_PARAMETER) {
const paramToken = this._advance<BlockParameterToken>();
parameters.push(new html.BlockParameter(paramToken.parts[0], paramToken.sourceSpan));
}
if (this._peek.type === TokenType.BLOCK_OPEN_END) {
this._advance();
}
const end = this._peek.sourceSpan.fullStart;
const span = new ParseSourceSpan(token.sourceSpan.start, end, token.sourceSpan.fullStart);
// Create a separate `startSpan` because `span` will be modified when there is an `end` span.
const startSpan = new ParseSourceSpan(token.sourceSpan.start, end, token.sourceSpan.fullStart);
const block = new html.Block(token.parts[0], parameters, [], span, token.sourceSpan, startSpan);
this._pushContainer(block, false);
}
private _consumeBlockClose(token: BlockCloseToken) {
const initialStackLength = this._containerStack.length;
const topNode = this._containerStack[initialStackLength - 1];
if (!this._popContainer(null, html.Block, token.sourceSpan)) {
if (this._containerStack.length < initialStackLength) {
const nodeName = topNode instanceof html.Component ? topNode.fullName : topNode.name;
this.errors.push(
TreeError.create(
null,
token.sourceSpan,
`Unexpected closing block. The block may have been closed earlier. ` +
`Did you forget to close the <${nodeName}> element? ` +
`If you meant to write the \`}\` character, you should use the "}" ` +
`HTML entity instead.`,
),
);
return;
}
this.errors.push(
TreeError.create(
null,
token.sourceSpan,
`Unexpected closing block. The block may have been closed earlier. ` +
`If you meant to write the \`}\` character, you should use the "}" ` +
`HTML entity instead.`,
),
);
}
}
private _consumeIncompleteBlock(token: IncompleteBlockOpenToken) {
const parameters: html.BlockParameter[] = [];
while (this._peek.type === TokenType.BLOCK_PARAMETER) {
const paramToken = this._advance<BlockParameterToken>();
parameters.push(new html.BlockParameter(paramToken.parts[0], paramToken.sourceSpan));
}
const end = this._peek.sourceSpan.fullStart;
const span = new ParseSourceSpan(token.sourceSpan.start, end, token.sourceSpan.fullStart);
// Create a separate `startSpan` because `span` will be modified when there is an `end` span.
const startSpan = new ParseSourceSpan(token.sourceSpan.start, end, token.sourceSpan.fullStart);
const block = new html.Block(token.parts[0], parameters, [], span, token.sourceSpan, startSpan);
this._pushContainer(block, false);
// Incomplete blocks don't have children so we close them immediately and report an error.
this._popContainer(null, html.Block, null);
this.errors.push(
TreeError.create(
token.parts[0],
span,
`Incomplete block "${token.parts[0]}". If you meant to write the @ character, ` +
`you should use the "@" HTML entity instead.`,
),
);
}
private _consumeLet(startToken: LetStartToken) {
const name = startToken.parts[0];
let valueToken: LetValueToken;
let endToken: LetEndToken;
if (this._peek.type !== TokenType.LET_VALUE) {
this.errors.push(
TreeError.create(
startToken.parts[0],
startToken.sourceSpan,
`Invalid @let declaration "${name}". Declaration must have a value.`,
),
);
return;
} else {
valueToken = this._advance();
}
// Type cast is necessary here since TS narrowed the type of `peek` above.
if ((this._peek as Token).type !== TokenType.LET_END) {
this.errors.push(
TreeError.create(
startToken.parts[0],
startToken.sourceSpan,
`Unterminated @let declaration "${name}". Declaration must be terminated with a semicolon.`,
),
);
return;
} else {
endToken = this._advance();
}
const end = endToken.sourceSpan.end;
const span = new ParseSourceSpan(
startToken.sourceSpan.start,
end,
startToken.sourceSpan.fullStart,
);
// The start token usually captures the `@let`. Construct a name span by
// offsetting the start by the length of any text before the name.
const startOffset = startToken.sourceSpan.toString().lastIndexOf(name);
const nameStart = startToken.sourceSpan.start.moveBy(startOffset);
const nameSpan = new ParseSourceSpan(nameStart, startToken.sourceSpan.end);
const node = new html.LetDeclaration(
name,
valueToken.parts[0],
span,
nameSpan,
valueToken.sourceSpan,
);
this._addToParent(node);
}
private _consumeIncompleteLet(token: IncompleteLetToken) {
// Incomplete `@let` declaration may end up with an empty name.
const name = token.parts[0] ?? '';
const nameString = name ? ` "${name}"` : '';
// If there's at least a name, we can salvage an AST node that can be used for completions.
if (name.length > 0) {
const startOffset = token.sourceSpan.toString().lastIndexOf(name);
const nameStart = token.sourceSpan.start.moveBy(startOffset);
const nameSpan = new ParseSourceSpan(nameStart, token.sourceSpan.end);
const valueSpan = new ParseSourceSpan(
token.sourceSpan.start,
token.sourceSpan.start.moveBy(0),
);
const node = new html.LetDeclaration(name, '', token.sourceSpan, nameSpan, valueSpan);
this._addToParent(node);
}
this.errors.push(
TreeError.create(
token.parts[0],
token.sourceSpan,
`Incomplete @let declaration${nameString}. ` +
`@let declarations must be written as \`@let <name> = <value>;\``,
),
);
}
private _getContainer(): NodeContainer | null {
return this._containerStack.length > 0
? this._containerStack[this._containerStack.length - 1]
: null;
}
private _getClosestElementLikeParent(): html.Element | html.Component | null {
for (let i = this._containerStack.length - 1; i > -1; i--) {
const current = this._containerStack[i];
if (current instanceof html.Element || current instanceof html.Component) {
return current;
}
}
return null;
}
private _addToParent(node: html.Node) {
const parent = this._getContainer();
if (parent === null) {
this.rootNodes.push(node);
} else {
parent.children.push(node);
}
}
private _getElementFullName(
token: TagOpenStartToken | IncompleteTagOpenToken | TagCloseToken,
parent: html.Element | html.Component | null,
): string {
const prefix = this._getPrefix(token, parent);
return mergeNsAndName(prefix, token.parts[1]);
}
private _getComponentFullName(
token: ComponentOpenStartToken | IncompleteComponentOpenToken | ComponentCloseToken,
parent: html.Element | html.Component | null,
): string {
const componentName = token.parts[0];
const tagName = this._getComponentTagName(token, parent);
if (tagName === null) {
return componentName;
}
return tagName.startsWith(':') ? componentName + tagName : `${componentName}:${tagName}`;
}
private _getComponentTagName(
token: ComponentOpenStartToken | IncompleteComponentOpenToken | ComponentCloseToken,
parent: html.Element | html.Component | null,
): string | null {
const prefix = this._getPrefix(token, parent);
const tagName = token.parts[2];
if (!prefix && !tagName) {
return null;
} else if (!prefix && tagName) {
return tagName;
} else {
// TODO(crisbeto): re-evaluate this fallback. Maybe base it off the class name?
return mergeNsAndName(prefix, tagName || 'ng-component');
}
}
private _getPrefix(
token:
| TagOpenStartToken
| IncompleteTagOpenToken
| ComponentOpenStartToken
| IncompleteComponentOpenToken
| TagCloseToken
| ComponentCloseToken,
parent: html.Element | html.Component | null,
): string {
let prefix: string;
let tagName: string;
if (
token.type === TokenType.COMPONENT_OPEN_START ||
token.type === TokenType.INCOMPLETE_COMPONENT_OPEN ||
token.type === TokenType.COMPONENT_CLOSE
) {
prefix = token.parts[1];
tagName = token.parts[2];
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