@taml/parser
Version:
Parser for TAML (Terminal ANSI Markup Language) that generates AST nodes
251 lines • 17.5 kB
JavaScript
/**
* Validator for TAML tokens and syntax
*/
import { isValidTag } from "@taml/ast";
import { InvalidTagError, MismatchedTagError, UnclosedTagError, } from "./errors.js";
import { isCloseTagToken, isEofToken, isOpenTagToken, isTextToken, } from "./tokenizer.js";
/**
* TAML Validator class
*/
export class TamlValidator {
source;
constructor(source) {
this.source = source;
}
/**
* Validate a sequence of tokens
*/
validateTokens(tokens) {
const context = {
tokens,
position: 0,
source: this.source,
tagStack: [],
errors: [],
};
try {
this.validateTokenSequence(context);
// Check for unclosed tags at the end
if (context.tagStack.length > 0) {
const unclosedTag = context.tagStack[context.tagStack.length - 1];
if (unclosedTag) {
const error = new UnclosedTagError(unclosedTag.tagName, unclosedTag.token.start, unclosedTag.token.line, unclosedTag.token.column, this.source);
context.errors.push(error);
}
}
return {
valid: context.errors.length === 0,
errors: context.errors,
};
}
catch (error) {
if (error instanceof Error) {
context.errors.push(error);
}
return {
valid: false,
errors: context.errors,
};
}
}
/**
* Validate the sequence of tokens
*/
validateTokenSequence(context) {
while (context.position < context.tokens.length) {
const token = context.tokens[context.position];
if (!token) {
break;
}
if (isEofToken(token)) {
break;
}
if (isOpenTagToken(token)) {
this.validateOpenTag(context, token);
}
else if (isCloseTagToken(token)) {
this.validateCloseTag(context, token);
}
else if (isTextToken(token)) {
// Text tokens are always valid
context.position++;
}
else {
// Skip unexpected tokens
context.position++;
}
}
}
/**
* Validate an opening tag token
*/
validateOpenTag(context, token) {
if (!isOpenTagToken(token)) {
context.position++;
return;
}
// Validate tag name against TAML specification
if (!isValidTag(token.tagName)) {
const error = new InvalidTagError(token.tagName, token.start, token.line, token.column, this.source);
context.errors.push(error);
context.position++;
return;
}
// Push tag onto stack for tracking
context.tagStack.push({
tagName: token.tagName,
token,
});
context.position++;
}
/**
* Validate a closing tag token
*/
validateCloseTag(context, token) {
if (!isCloseTagToken(token)) {
context.position++;
return;
}
// Validate tag name against TAML specification
if (!isValidTag(token.tagName)) {
const error = new InvalidTagError(token.tagName, token.start, token.line, token.column, this.source);
context.errors.push(error);
context.position++;
return;
}
// Check if there's a matching opening tag
if (context.tagStack.length === 0) {
// No opening tag to match - this is an extra closing tag
const error = new MismatchedTagError("(none)", token.tagName, token.start, token.line, token.column, this.source);
context.errors.push(error);
context.position++;
return;
}
// Check if the closing tag matches the most recent opening tag
const lastOpenTag = context.tagStack[context.tagStack.length - 1];
if (lastOpenTag && lastOpenTag.tagName !== token.tagName) {
const error = new MismatchedTagError(lastOpenTag.tagName, token.tagName, token.start, token.line, token.column, this.source);
context.errors.push(error);
context.position++;
return;
}
// Valid closing tag - pop from stack
context.tagStack.pop();
context.position++;
}
/**
* Get current validation state for debugging
*/
getDebugInfo(context) {
return {
position: context.position,
currentToken: context.position < context.tokens.length
? (context.tokens[context.position] ?? null)
: null,
tagStack: context.tagStack.map((entry) => entry.tagName),
errorCount: context.errors.length,
};
}
}
/**
* Convenience function to validate TAML tokens
*/
export function validateTamlTokens(tokens, source) {
const validator = new TamlValidator(source);
return validator.validateTokens(tokens);
}
/**
* Validate tag name against TAML specification
*/
export function validateTagName(tagName) {
return isValidTag(tagName);
}
/**
* Check if nesting is valid (stack-based validation)
*/
export function validateNesting(tokens) {
const tagStack = [];
const unclosedTags = [];
const mismatchedTags = [];
for (const token of tokens) {
if (isOpenTagToken(token)) {
if (isValidTag(token.tagName)) {
tagStack.push(token.tagName);
}
}
else if (isCloseTagToken(token)) {
if (isValidTag(token.tagName)) {
if (tagStack.length === 0) {
mismatchedTags.push({ expected: "(none)", actual: token.tagName });
}
else {
const lastTag = tagStack[tagStack.length - 1];
if (lastTag && lastTag === token.tagName) {
tagStack.pop();
}
else if (lastTag) {
mismatchedTags.push({ expected: lastTag, actual: token.tagName });
}
}
}
}
}
// Any remaining tags in stack are unclosed
unclosedTags.push(...tagStack);
return {
valid: unclosedTags.length === 0 && mismatchedTags.length === 0,
unclosedTags,
mismatchedTags,
};
}
/**
* Validate proper tag closure
*/
export function validateTagClosure(tokens) {
const tagStack = [];
const issues = [];
for (const token of tokens) {
if (isOpenTagToken(token)) {
if (isValidTag(token.tagName)) {
tagStack.push({ tagName: token.tagName, position: token.start });
}
}
else if (isCloseTagToken(token)) {
if (isValidTag(token.tagName)) {
if (tagStack.length === 0) {
issues.push({
type: "extra",
tagName: token.tagName,
position: token.start,
});
}
else {
const lastTag = tagStack[tagStack.length - 1];
if (lastTag && lastTag.tagName === token.tagName) {
tagStack.pop();
}
else {
issues.push({
type: "mismatched",
tagName: token.tagName,
position: token.start,
});
}
}
}
}
}
// Any remaining tags in stack are unclosed
for (const unclosedTag of tagStack) {
issues.push({
type: "unclosed",
tagName: unclosedTag.tagName,
position: unclosedTag.position,
});
}
return {
valid: issues.length === 0,
issues,
};
}
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