devsite/node_modules/markdown-it/lib/rules_block/blockquote.js
2024-07-07 18:49:38 -07:00

227 lines
6.1 KiB
JavaScript

// Block quotes
'use strict';
var isSpace = require('../common/utils').isSpace;
module.exports = function blockquote(state, startLine, endLine, silent) {
var adjustTab,
ch,
i,
initial,
l,
lastLineEmpty,
lines,
nextLine,
offset,
oldBMarks,
oldBSCount,
oldIndent,
oldParentType,
oldSCount,
oldTShift,
spaceAfterMarker,
terminate,
terminatorRules,
token,
isOutdented,
oldLineMax = state.lineMax,
pos = state.bMarks[startLine] + state.tShift[startLine],
max = state.eMarks[startLine];
// if it's indented more than 3 spaces, it should be a code block
if (state.sCount[startLine] - state.blkIndent >= 4) { return false; }
// check the block quote marker
if (state.src.charCodeAt(pos) !== 0x3E/* > */) { return false; }
// we know that it's going to be a valid blockquote,
// so no point trying to find the end of it in silent mode
if (silent) { return true; }
oldBMarks = [];
oldBSCount = [];
oldSCount = [];
oldTShift = [];
terminatorRules = state.md.block.ruler.getRules('blockquote');
oldParentType = state.parentType;
state.parentType = 'blockquote';
// Search the end of the block
//
// Block ends with either:
// 1. an empty line outside:
// ```
// > test
//
// ```
// 2. an empty line inside:
// ```
// >
// test
// ```
// 3. another tag:
// ```
// > test
// - - -
// ```
for (nextLine = startLine; nextLine < endLine; nextLine++) {
// check if it's outdented, i.e. it's inside list item and indented
// less than said list item:
//
// ```
// 1. anything
// > current blockquote
// 2. checking this line
// ```
isOutdented = state.sCount[nextLine] < state.blkIndent;
pos = state.bMarks[nextLine] + state.tShift[nextLine];
max = state.eMarks[nextLine];
if (pos >= max) {
// Case 1: line is not inside the blockquote, and this line is empty.
break;
}
if (state.src.charCodeAt(pos++) === 0x3E/* > */ && !isOutdented) {
// This line is inside the blockquote.
// set offset past spaces and ">"
initial = state.sCount[nextLine] + 1;
// skip one optional space after '>'
if (state.src.charCodeAt(pos) === 0x20 /* space */) {
// ' > test '
// ^ -- position start of line here:
pos++;
initial++;
adjustTab = false;
spaceAfterMarker = true;
} else if (state.src.charCodeAt(pos) === 0x09 /* tab */) {
spaceAfterMarker = true;
if ((state.bsCount[nextLine] + initial) % 4 === 3) {
// ' >\t test '
// ^ -- position start of line here (tab has width===1)
pos++;
initial++;
adjustTab = false;
} else {
// ' >\t test '
// ^ -- position start of line here + shift bsCount slightly
// to make extra space appear
adjustTab = true;
}
} else {
spaceAfterMarker = false;
}
offset = initial;
oldBMarks.push(state.bMarks[nextLine]);
state.bMarks[nextLine] = pos;
while (pos < max) {
ch = state.src.charCodeAt(pos);
if (isSpace(ch)) {
if (ch === 0x09) {
offset += 4 - (offset + state.bsCount[nextLine] + (adjustTab ? 1 : 0)) % 4;
} else {
offset++;
}
} else {
break;
}
pos++;
}
lastLineEmpty = pos >= max;
oldBSCount.push(state.bsCount[nextLine]);
state.bsCount[nextLine] = state.sCount[nextLine] + 1 + (spaceAfterMarker ? 1 : 0);
oldSCount.push(state.sCount[nextLine]);
state.sCount[nextLine] = offset - initial;
oldTShift.push(state.tShift[nextLine]);
state.tShift[nextLine] = pos - state.bMarks[nextLine];
continue;
}
// Case 2: line is not inside the blockquote, and the last line was empty.
if (lastLineEmpty) { break; }
// Case 3: another tag found.
terminate = false;
for (i = 0, l = terminatorRules.length; i < l; i++) {
if (terminatorRules[i](state, nextLine, endLine, true)) {
terminate = true;
break;
}
}
if (terminate) {
// Quirk to enforce "hard termination mode" for paragraphs;
// normally if you call `tokenize(state, startLine, nextLine)`,
// paragraphs will look below nextLine for paragraph continuation,
// but if blockquote is terminated by another tag, they shouldn't
state.lineMax = nextLine;
if (state.blkIndent !== 0) {
// state.blkIndent was non-zero, we now set it to zero,
// so we need to re-calculate all offsets to appear as
// if indent wasn't changed
oldBMarks.push(state.bMarks[nextLine]);
oldBSCount.push(state.bsCount[nextLine]);
oldTShift.push(state.tShift[nextLine]);
oldSCount.push(state.sCount[nextLine]);
state.sCount[nextLine] -= state.blkIndent;
}
break;
}
oldBMarks.push(state.bMarks[nextLine]);
oldBSCount.push(state.bsCount[nextLine]);
oldTShift.push(state.tShift[nextLine]);
oldSCount.push(state.sCount[nextLine]);
// A negative indentation means that this is a paragraph continuation
//
state.sCount[nextLine] = -1;
}
oldIndent = state.blkIndent;
state.blkIndent = 0;
token = state.push('blockquote_open', 'blockquote', 1);
token.markup = '>';
token.map = lines = [ startLine, 0 ];
state.md.block.tokenize(state, startLine, nextLine);
token = state.push('blockquote_close', 'blockquote', -1);
token.markup = '>';
state.lineMax = oldLineMax;
state.parentType = oldParentType;
lines[1] = state.line;
// Restore original tShift; this might not be necessary since the parser
// has already been here, but just to make sure we can do that.
for (i = 0; i < oldTShift.length; i++) {
state.bMarks[i + startLine] = oldBMarks[i];
state.tShift[i + startLine] = oldTShift[i];
state.sCount[i + startLine] = oldSCount[i];
state.bsCount[i + startLine] = oldBSCount[i];
}
state.blkIndent = oldIndent;
return true;
};