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// Parse link title
//
import { unescapeAll } from '../common/utils.mjs'
// Parse link title within `str` in [start, max] range,
// or continue previous parsing if `prev_state` is defined (equal to result of last execution).
//
export default function parseLinkTitle (str, start, max, prev_state) {
let code
let pos = start
const state = {
// if `true`, this is a valid link title
ok: false,
// if `true`, this link can be continued on the next line
can_continue: false,
// if `ok`, it's the position of the first character after the closing marker
pos: 0,
// if `ok`, it's the unescaped title
str: '',
// expected closing marker character code
marker: 0
}
if (prev_state) {
// this is a continuation of a previous parseLinkTitle call on the next line,
// used in reference links only
state.str = prev_state.str
state.marker = prev_state.marker
} else {
if (pos >= max) { return state }
let marker = str.charCodeAt(pos)
if (marker !== 0x22 /* " */ && marker !== 0x27 /* ' */ && marker !== 0x28 /* ( */) { return state }
start++
pos++
// if opening marker is "(", switch it to closing marker ")"
if (marker === 0x28) { marker = 0x29 }
state.marker = marker
}
while (pos < max) {
code = str.charCodeAt(pos)
if (code === state.marker) {
state.pos = pos + 1
state.str += unescapeAll(str.slice(start, pos))
state.ok = true
return state
} else if (code === 0x28 /* ( */ && state.marker === 0x29 /* ) */) {
return state
} else if (code === 0x5C /* \ */ && pos + 1 < max) {
pos++
}
pos++
}
// no closing marker found, but this link title may continue on the next line (for references)
state.can_continue = true
state.str += unescapeAll(str.slice(start, pos))
return state
}
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