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tokenizer.ts
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tokenizer.ts
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import { TagToken, HTMLToken, HashToken, QuotedToken, LiquidTagToken, OutputToken, ValueToken, Token, RangeToken, FilterToken, TopLevelToken, PropertyAccessToken, OperatorToken, LiteralToken, IdentifierToken, NumberToken } from '../tokens'
import { Trie, createTrie, ellipsis, literalValues, assert, TokenizationError, TYPES, QUOTE, BLANK, IDENTIFIER } from '../util'
import { Operators, Expression } from '../render'
import { NormalizedFullOptions, defaultOptions } from '../liquid-options'
import { FilterArg } from './filter-arg'
import { matchOperator } from './match-operator'
import { whiteSpaceCtrl } from './whitespace-ctrl'
export class Tokenizer {
p = 0
N: number
private rawBeginAt = -1
private opTrie: Trie
constructor (
public input: string,
operators: Operators = defaultOptions.operators,
public file?: string
) {
this.N = input.length
this.opTrie = createTrie(operators)
}
readExpression () {
return new Expression(this.readExpressionTokens())
}
* readExpressionTokens (): IterableIterator<Token> {
while (this.p < this.N) {
const operator = this.readOperator()
if (operator) {
yield operator
continue
}
const operand = this.readValue()
if (operand) {
yield operand
continue
}
return
}
}
readOperator (): OperatorToken | undefined {
this.skipBlank()
const end = matchOperator(this.input, this.p, this.opTrie)
if (end === -1) return
return new OperatorToken(this.input, this.p, (this.p = end), this.file)
}
readFilters (): FilterToken[] {
const filters = []
while (true) {
const filter = this.readFilter()
if (!filter) return filters
filters.push(filter)
}
}
readFilter (): FilterToken | null {
this.skipBlank()
if (this.end()) return null
assert(this.peek() === '|', () => `expected "|" before filter`)
this.p++
const begin = this.p
const name = this.readIdentifier()
if (!name.size()) return null
const args = []
this.skipBlank()
if (this.peek() === ':') {
do {
++this.p
const arg = this.readFilterArg()
arg && args.push(arg)
this.skipBlank()
assert(this.end() || this.peek() === ',' || this.peek() === '|', () => `unexpected character ${this.snapshot()}`)
} while (this.peek() === ',')
} else if (this.peek() === '|' || this.end()) {
// do nothing
} else {
throw new Error('expected ":" after filter name')
}
return new FilterToken(name.getText(), args, this.input, begin, this.p, this.file)
}
readFilterArg (): FilterArg | undefined {
const key = this.readValue()
if (!key) return
this.skipBlank()
if (this.peek() !== ':') return key
++this.p
const value = this.readValue()
return [key.getText(), value]
}
readTopLevelTokens (options: NormalizedFullOptions = defaultOptions): TopLevelToken[] {
const tokens: TopLevelToken[] = []
while (this.p < this.N) {
const token = this.readTopLevelToken(options)
tokens.push(token)
}
whiteSpaceCtrl(tokens, options)
return tokens
}
readTopLevelToken (options: NormalizedFullOptions): TopLevelToken {
const { tagDelimiterLeft, outputDelimiterLeft } = options
if (this.rawBeginAt > -1) return this.readEndrawOrRawContent(options)
if (this.match(tagDelimiterLeft)) return this.readTagToken(options)
if (this.match(outputDelimiterLeft)) return this.readOutputToken(options)
return this.readHTMLToken([tagDelimiterLeft, outputDelimiterLeft])
}
readHTMLToken (stopStrings: string[]): HTMLToken {
const begin = this.p
while (this.p < this.N) {
if (stopStrings.some(str => this.match(str))) break
++this.p
}
return new HTMLToken(this.input, begin, this.p, this.file)
}
readTagToken (options: NormalizedFullOptions = defaultOptions): TagToken {
const { file, input } = this
const begin = this.p
if (this.readToDelimiter(options.tagDelimiterRight) === -1) {
throw this.mkError(`tag ${this.snapshot(begin)} not closed`, begin)
}
const token = new TagToken(input, begin, this.p, options, file)
if (token.name === 'raw') this.rawBeginAt = begin
return token
}
readToDelimiter (delimiter: string) {
while (this.p < this.N) {
if ((this.peekType() & QUOTE)) {
this.readQuoted()
continue
}
++this.p
if (this.rmatch(delimiter)) return this.p
}
return -1
}
readOutputToken (options: NormalizedFullOptions = defaultOptions): OutputToken {
const { file, input } = this
const { outputDelimiterRight } = options
const begin = this.p
if (this.readToDelimiter(outputDelimiterRight) === -1) {
throw this.mkError(`output ${this.snapshot(begin)} not closed`, begin)
}
return new OutputToken(input, begin, this.p, options, file)
}
readEndrawOrRawContent (options: NormalizedFullOptions): HTMLToken | TagToken {
const { tagDelimiterLeft, tagDelimiterRight } = options
const begin = this.p
let leftPos = this.readTo(tagDelimiterLeft) - tagDelimiterLeft.length
while (this.p < this.N) {
if (this.readIdentifier().getText() !== 'endraw') {
leftPos = this.readTo(tagDelimiterLeft) - tagDelimiterLeft.length
continue
}
while (this.p <= this.N) {
if (this.rmatch(tagDelimiterRight)) {
const end = this.p
if (begin === leftPos) {
this.rawBeginAt = -1
return new TagToken(this.input, begin, end, options, this.file)
} else {
this.p = leftPos
return new HTMLToken(this.input, begin, leftPos, this.file)
}
}
if (this.rmatch(tagDelimiterLeft)) break
this.p++
}
}
throw this.mkError(`raw ${this.snapshot(this.rawBeginAt)} not closed`, begin)
}
readLiquidTagTokens (options: NormalizedFullOptions = defaultOptions): LiquidTagToken[] {
const tokens: LiquidTagToken[] = []
while (this.p < this.N) {
const token = this.readLiquidTagToken(options)
if (token.name) tokens.push(token)
}
return tokens
}
readLiquidTagToken (options: NormalizedFullOptions): LiquidTagToken {
const { file, input } = this
const begin = this.p
let end = this.N
if (this.readToDelimiter('\n') !== -1) end = this.p
return new LiquidTagToken(input, begin, end, options, file)
}
mkError (msg: string, begin: number) {
return new TokenizationError(msg, new IdentifierToken(this.input, begin, this.N, this.file))
}
snapshot (begin: number = this.p) {
return JSON.stringify(ellipsis(this.input.slice(begin), 16))
}
/**
* @deprecated use #readIdentifier instead
*/
readWord () {
return this.readIdentifier()
}
readIdentifier (): IdentifierToken {
this.skipBlank()
const begin = this.p
while (this.peekType() & IDENTIFIER) ++this.p
return new IdentifierToken(this.input, begin, this.p, this.file)
}
readTagName (): string {
this.skipBlank()
// Handle inline comment tags
if (this.input[this.p] === '#') return this.input.slice(this.p, ++this.p)
return this.readIdentifier().getText()
}
readHashes (jekyllStyle?: boolean) {
const hashes = []
while (true) {
const hash = this.readHash(jekyllStyle)
if (!hash) return hashes
hashes.push(hash)
}
}
readHash (jekyllStyle?: boolean): HashToken | undefined {
this.skipBlank()
if (this.peek() === ',') ++this.p
const begin = this.p
const name = this.readIdentifier()
if (!name.size()) return
let value
this.skipBlank()
const sep = jekyllStyle ? '=' : ':'
if (this.peek() === sep) {
++this.p
value = this.readValue()
}
return new HashToken(this.input, begin, this.p, name, value, this.file)
}
remaining () {
return this.input.slice(this.p)
}
advance (i = 1) {
this.p += i
}
end () {
return this.p >= this.N
}
readTo (end: string): number {
while (this.p < this.N) {
++this.p
if (this.rmatch(end)) return this.p
}
return -1
}
readValue (): ValueToken | undefined {
const value = this.readQuoted() || this.readRange()
if (value) return value
if (this.peek() === '[') {
this.p++
const prop = this.readQuoted()
if (!prop) return
if (this.peek() !== ']') return
this.p++
return new PropertyAccessToken(prop, [], this.p)
}
const variable = this.readIdentifier()
if (!variable.size()) return
let isNumber = variable.isNumber(true)
const props: (QuotedToken | IdentifierToken)[] = []
while (true) {
if (this.peek() === '[') {
isNumber = false
this.p++
const prop = this.readValue() || new IdentifierToken(this.input, this.p, this.p, this.file)
this.readTo(']')
props.push(prop)
} else if (this.peek() === '.' && this.peek(1) !== '.') { // skip range syntax
this.p++
const prop = this.readIdentifier()
if (!prop.size()) break
if (!prop.isNumber()) isNumber = false
props.push(prop)
} else break
}
if (!props.length && literalValues.hasOwnProperty(variable.content)) {
return new LiteralToken(this.input, variable.begin, variable.end, this.file)
}
if (isNumber) return new NumberToken(variable, props[0] as IdentifierToken)
return new PropertyAccessToken(variable, props, this.p)
}
readRange (): RangeToken | undefined {
this.skipBlank()
const begin = this.p
if (this.peek() !== '(') return
++this.p
const lhs = this.readValueOrThrow()
this.p += 2
const rhs = this.readValueOrThrow()
++this.p
return new RangeToken(this.input, begin, this.p, lhs, rhs, this.file)
}
readValueOrThrow (): ValueToken {
const value = this.readValue()
assert(value, () => `unexpected token ${this.snapshot()}, value expected`)
return value!
}
readQuoted (): QuotedToken | undefined {
this.skipBlank()
const begin = this.p
if (!(this.peekType() & QUOTE)) return
++this.p
let escaped = false
while (this.p < this.N) {
++this.p
if (this.input[this.p - 1] === this.input[begin] && !escaped) break
if (escaped) escaped = false
else if (this.input[this.p - 1] === '\\') escaped = true
}
return new QuotedToken(this.input, begin, this.p, this.file)
}
* readFileNameTemplate (options: NormalizedFullOptions): IterableIterator<TopLevelToken> {
const { outputDelimiterLeft } = options
const htmlStopStrings = [',', ' ', outputDelimiterLeft]
const htmlStopStringSet = new Set(htmlStopStrings)
// break on ',' and ' ', outputDelimiterLeft only stops HTML token
while (this.p < this.N && !htmlStopStringSet.has(this.peek())) {
yield this.match(outputDelimiterLeft)
? this.readOutputToken(options)
: this.readHTMLToken(htmlStopStrings)
}
}
match (word: string) {
for (let i = 0; i < word.length; i++) {
if (word[i] !== this.input[this.p + i]) return false
}
return true
}
rmatch (pattern: string) {
for (let i = 0; i < pattern.length; i++) {
if (pattern[pattern.length - 1 - i] !== this.input[this.p - 1 - i]) return false
}
return true
}
peekType (n = 0) {
return TYPES[this.input.charCodeAt(this.p + n)]
}
peek (n = 0) {
return this.input[this.p + n]
}
skipBlank () {
while (this.peekType() & BLANK) ++this.p
}
}