markdown_it.rules_inline.image 源代码

# Process ![image](<src> "title")

from typing import List

from .state_inline import StateInline
from ..token import Token
from ..common.utils import isSpace, normalizeReference


[文档]def image(state: StateInline, silent: bool): label = None href = "" oldPos = state.pos max = state.posMax # /* ! */ if state.srcCharCode[state.pos] != 0x21: return False # /* [ */ if state.pos + 1 < state.posMax and state.srcCharCode[state.pos + 1] != 0x5B: return False labelStart = state.pos + 2 labelEnd = state.md.helpers.parseLinkLabel(state, state.pos + 1, False) # parser failed to find ']', so it's not a valid link if labelEnd < 0: return False pos = labelEnd + 1 # /* ( */ if pos < max and state.srcCharCode[pos] == 0x28: # # Inline link # # [link]( <href> "title" ) # ^^ skipping these spaces pos += 1 while pos < max: code = state.srcCharCode[pos] if not isSpace(code) and code != 0x0A: break pos += 1 if pos >= max: return False # [link]( <href> "title" ) # ^^^^^^ parsing link destination start = pos res = state.md.helpers.parseLinkDestination(state.src, pos, state.posMax) if res.ok: href = state.md.normalizeLink(res.str) if state.md.validateLink(href): pos = res.pos else: href = "" # [link]( <href> "title" ) # ^^ skipping these spaces start = pos while pos < max: code = state.srcCharCode[pos] if not isSpace(code) and code != 0x0A: break pos += 1 # [link]( <href> "title" ) # ^^^^^^^ parsing link title res = state.md.helpers.parseLinkTitle(state.src, pos, state.posMax) if pos < max and start != pos and res.ok: title = res.str pos = res.pos # [link]( <href> "title" ) # ^^ skipping these spaces while pos < max: code = state.srcCharCode[pos] if not isSpace(code) and code != 0x0A: break pos += 1 else: title = "" # /* ) */ if pos >= max or state.srcCharCode[pos] != 0x29: state.pos = oldPos return False pos += 1 else: # # Link reference # if "references" not in state.env: return False # /* [ */ if pos < max and state.srcCharCode[pos] == 0x5B: start = pos + 1 pos = state.md.helpers.parseLinkLabel(state, pos) if pos >= 0: label = state.src[start:pos] pos += 1 else: pos = labelEnd + 1 else: pos = labelEnd + 1 # covers label == '' and label == undefined # (collapsed reference link and shortcut reference link respectively) if not label: label = state.src[labelStart:labelEnd] label = normalizeReference(label) ref = state.env["references"].get(label, None) if not ref: state.pos = oldPos return False href = ref["href"] title = ref["title"] # # We found the end of the link, and know for a fact it's a valid link # so all that's left to do is to call tokenizer. # if not silent: content = state.src[labelStart:labelEnd] tokens: List[Token] = [] state.md.inline.parse(content, state.md, state.env, tokens) token = state.push("image", "img", 0) token.attrs = {"src": href, "alt": ""} token.children = tokens or None token.content = content if title: token.attrSet("title", title) # note, this is not part of markdown-it JS, but is useful for renderers if label and state.md.options.get("store_labels", False): token.meta["label"] = label state.pos = pos state.posMax = max return True