Mercurial
diff .cms/lib/codemirror/src/util/StringStream.js @ 0:78edf6b517a0 draft
24.10
author | Coffee CMS <info@coffee-cms.ru> |
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date | Fri, 11 Oct 2024 22:40:23 +0000 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/.cms/lib/codemirror/src/util/StringStream.js Fri Oct 11 22:40:23 2024 +0000 @@ -0,0 +1,90 @@ +import { countColumn } from "./misc.js" + +// STRING STREAM + +// Fed to the mode parsers, provides helper functions to make +// parsers more succinct. + +class StringStream { + constructor(string, tabSize, lineOracle) { + this.pos = this.start = 0 + this.string = string + this.tabSize = tabSize || 8 + this.lastColumnPos = this.lastColumnValue = 0 + this.lineStart = 0 + this.lineOracle = lineOracle + } + + eol() {return this.pos >= this.string.length} + sol() {return this.pos == this.lineStart} + peek() {return this.string.charAt(this.pos) || undefined} + next() { + if (this.pos < this.string.length) + return this.string.charAt(this.pos++) + } + eat(match) { + let ch = this.string.charAt(this.pos) + let ok + if (typeof match == "string") ok = ch == match + else ok = ch && (match.test ? match.test(ch) : match(ch)) + if (ok) {++this.pos; return ch} + } + eatWhile(match) { + let start = this.pos + while (this.eat(match)){} + return this.pos > start + } + eatSpace() { + let start = this.pos + while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) ++this.pos + return this.pos > start + } + skipToEnd() {this.pos = this.string.length} + skipTo(ch) { + let found = this.string.indexOf(ch, this.pos) + if (found > -1) {this.pos = found; return true} + } + backUp(n) {this.pos -= n} + column() { + if (this.lastColumnPos < this.start) { + this.lastColumnValue = countColumn(this.string, this.start, this.tabSize, this.lastColumnPos, this.lastColumnValue) + this.lastColumnPos = this.start + } + return this.lastColumnValue - (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0) + } + indentation() { + return countColumn(this.string, null, this.tabSize) - + (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0) + } + match(pattern, consume, caseInsensitive) { + if (typeof pattern == "string") { + let cased = str => caseInsensitive ? str.toLowerCase() : str + let substr = this.string.substr(this.pos, pattern.length) + if (cased(substr) == cased(pattern)) { + if (consume !== false) this.pos += pattern.length + return true + } + } else { + let match = this.string.slice(this.pos).match(pattern) + if (match && match.index > 0) return null + if (match && consume !== false) this.pos += match[0].length + return match + } + } + current(){return this.string.slice(this.start, this.pos)} + hideFirstChars(n, inner) { + this.lineStart += n + try { return inner() } + finally { this.lineStart -= n } + } + lookAhead(n) { + let oracle = this.lineOracle + return oracle && oracle.lookAhead(n) + } + baseToken() { + let oracle = this.lineOracle + return oracle && oracle.baseToken(this.pos) + } +} + +export default StringStream