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comparison .cms/lib/codemirror/src/util/StringStream.js @ 0:78edf6b517a0 draft

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24.10
author Coffee CMS <info@coffee-cms.ru>
date Fri, 11 Oct 2024 22:40:23 +0000
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-1:000000000000 0:78edf6b517a0
1 import { countColumn } from "./misc.js"
2
3 // STRING STREAM
4
5 // Fed to the mode parsers, provides helper functions to make
6 // parsers more succinct.
7
8 class StringStream {
9 constructor(string, tabSize, lineOracle) {
10 this.pos = this.start = 0
11 this.string = string
12 this.tabSize = tabSize || 8
13 this.lastColumnPos = this.lastColumnValue = 0
14 this.lineStart = 0
15 this.lineOracle = lineOracle
16 }
17
18 eol() {return this.pos >= this.string.length}
19 sol() {return this.pos == this.lineStart}
20 peek() {return this.string.charAt(this.pos) || undefined}
21 next() {
22 if (this.pos < this.string.length)
23 return this.string.charAt(this.pos++)
24 }
25 eat(match) {
26 let ch = this.string.charAt(this.pos)
27 let ok
28 if (typeof match == "string") ok = ch == match
29 else ok = ch && (match.test ? match.test(ch) : match(ch))
30 if (ok) {++this.pos; return ch}
31 }
32 eatWhile(match) {
33 let start = this.pos
34 while (this.eat(match)){}
35 return this.pos > start
36 }
37 eatSpace() {
38 let start = this.pos
39 while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) ++this.pos
40 return this.pos > start
41 }
42 skipToEnd() {this.pos = this.string.length}
43 skipTo(ch) {
44 let found = this.string.indexOf(ch, this.pos)
45 if (found > -1) {this.pos = found; return true}
46 }
47 backUp(n) {this.pos -= n}
48 column() {
49 if (this.lastColumnPos < this.start) {
50 this.lastColumnValue = countColumn(this.string, this.start, this.tabSize, this.lastColumnPos, this.lastColumnValue)
51 this.lastColumnPos = this.start
52 }
53 return this.lastColumnValue - (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)
54 }
55 indentation() {
56 return countColumn(this.string, null, this.tabSize) -
57 (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)
58 }
59 match(pattern, consume, caseInsensitive) {
60 if (typeof pattern == "string") {
61 let cased = str => caseInsensitive ? str.toLowerCase() : str
62 let substr = this.string.substr(this.pos, pattern.length)
63 if (cased(substr) == cased(pattern)) {
64 if (consume !== false) this.pos += pattern.length
65 return true
66 }
67 } else {
68 let match = this.string.slice(this.pos).match(pattern)
69 if (match && match.index > 0) return null
70 if (match && consume !== false) this.pos += match[0].length
71 return match
72 }
73 }
74 current(){return this.string.slice(this.start, this.pos)}
75 hideFirstChars(n, inner) {
76 this.lineStart += n
77 try { return inner() }
78 finally { this.lineStart -= n }
79 }
80 lookAhead(n) {
81 let oracle = this.lineOracle
82 return oracle && oracle.lookAhead(n)
83 }
84 baseToken() {
85 let oracle = this.lineOracle
86 return oracle && oracle.baseToken(this.pos)
87 }
88 }
89
90 export default StringStream