update

node_modules/markdown-it/lib/rules_block/state_block.js

@@ -0,0 +1,230 @@
+// Parser state class
+
+'use strict';
+
+var Token = require('../token');
+var isSpace = require('../common/utils').isSpace;
+
+
+function StateBlock(src, md, env, tokens) {
+  var ch, s, start, pos, len, indent, offset, indent_found;
+
+  this.src = src;
+
+  // link to parser instance
+  this.md     = md;
+
+  this.env = env;
+
+  //
+  // Internal state vartiables
+  //
+
+  this.tokens = tokens;
+
+  this.bMarks = [];  // line begin offsets for fast jumps
+  this.eMarks = [];  // line end offsets for fast jumps
+  this.tShift = [];  // offsets of the first non-space characters (tabs not expanded)
+  this.sCount = [];  // indents for each line (tabs expanded)
+
+  // An amount of virtual spaces (tabs expanded) between beginning
+  // of each line (bMarks) and real beginning of that line.
+  //
+  // It exists only as a hack because blockquotes override bMarks
+  // losing information in the process.
+  //
+  // It's used only when expanding tabs, you can think about it as
+  // an initial tab length, e.g. bsCount=21 applied to string `\t123`
+  // means first tab should be expanded to 4-21%4 === 3 spaces.
+  //
+  this.bsCount = [];
+
+  // block parser variables
+  this.blkIndent  = 0; // required block content indent
+                       // (for example, if we are in list)
+  this.line       = 0; // line index in src
+  this.lineMax    = 0; // lines count
+  this.tight      = false;  // loose/tight mode for lists
+  this.ddIndent   = -1; // indent of the current dd block (-1 if there isn't any)
+
+  // can be 'blockquote', 'list', 'root', 'paragraph' or 'reference'
+  // used in lists to determine if they interrupt a paragraph
+  this.parentType = 'root';
+
+  this.level = 0;
+
+  // renderer
+  this.result = '';
+
+  // Create caches
+  // Generate markers.
+  s = this.src;
+  indent_found = false;
+
+  for (start = pos = indent = offset = 0, len = s.length; pos < len; pos++) {
+    ch = s.charCodeAt(pos);
+
+    if (!indent_found) {
+      if (isSpace(ch)) {
+        indent++;
+
+        if (ch === 0x09) {
+          offset += 4 - offset % 4;
+        } else {
+          offset++;
+        }
+        continue;
+      } else {
+        indent_found = true;
+      }
+    }
+
+    if (ch === 0x0A || pos === len - 1) {
+      if (ch !== 0x0A) { pos++; }
+      this.bMarks.push(start);
+      this.eMarks.push(pos);
+      this.tShift.push(indent);
+      this.sCount.push(offset);
+      this.bsCount.push(0);
+
+      indent_found = false;
+      indent = 0;
+      offset = 0;
+      start = pos + 1;
+    }
+  }
+
+  // Push fake entry to simplify cache bounds checks
+  this.bMarks.push(s.length);
+  this.eMarks.push(s.length);
+  this.tShift.push(0);
+  this.sCount.push(0);
+  this.bsCount.push(0);
+
+  this.lineMax = this.bMarks.length - 1; // don't count last fake line
+}
+
+// Push new token to "stream".
+//
+StateBlock.prototype.push = function (type, tag, nesting) {
+  var token = new Token(type, tag, nesting);
+  token.block = true;
+
+  if (nesting < 0) { this.level--; }
+  token.level = this.level;
+  if (nesting > 0) { this.level++; }
+
+  this.tokens.push(token);
+  return token;
+};
+
+StateBlock.prototype.isEmpty = function isEmpty(line) {
+  return this.bMarks[line] + this.tShift[line] >= this.eMarks[line];
+};
+
+StateBlock.prototype.skipEmptyLines = function skipEmptyLines(from) {
+  for (var max = this.lineMax; from < max; from++) {
+    if (this.bMarks[from] + this.tShift[from] < this.eMarks[from]) {
+      break;
+    }
+  }
+  return from;
+};
+
+// Skip spaces from given position.
+StateBlock.prototype.skipSpaces = function skipSpaces(pos) {
+  var ch;
+
+  for (var max = this.src.length; pos < max; pos++) {
+    ch = this.src.charCodeAt(pos);
+    if (!isSpace(ch)) { break; }
+  }
+  return pos;
+};
+
+// Skip spaces from given position in reverse.
+StateBlock.prototype.skipSpacesBack = function skipSpacesBack(pos, min) {
+  if (pos <= min) { return pos; }
+
+  while (pos > min) {
+    if (!isSpace(this.src.charCodeAt(--pos))) { return pos + 1; }
+  }
+  return pos;
+};
+
+// Skip char codes from given position
+StateBlock.prototype.skipChars = function skipChars(pos, code) {
+  for (var max = this.src.length; pos < max; pos++) {
+    if (this.src.charCodeAt(pos) !== code) { break; }
+  }
+  return pos;
+};
+
+// Skip char codes reverse from given position - 1
+StateBlock.prototype.skipCharsBack = function skipCharsBack(pos, code, min) {
+  if (pos <= min) { return pos; }
+
+  while (pos > min) {
+    if (code !== this.src.charCodeAt(--pos)) { return pos + 1; }
+  }
+  return pos;
+};
+
+// cut lines range from source.
+StateBlock.prototype.getLines = function getLines(begin, end, indent, keepLastLF) {
+  var i, lineIndent, ch, first, last, queue, lineStart,
+      line = begin;
+
+  if (begin >= end) {
+    return '';
+  }
+
+  queue = new Array(end - begin);
+
+  for (i = 0; line < end; line++, i++) {
+    lineIndent = 0;
+    lineStart = first = this.bMarks[line];
+
+    if (line + 1 < end || keepLastLF) {
+      // No need for bounds check because we have fake entry on tail.
+      last = this.eMarks[line] + 1;
+    } else {
+      last = this.eMarks[line];
+    }
+
+    while (first < last && lineIndent < indent) {
+      ch = this.src.charCodeAt(first);
+
+      if (isSpace(ch)) {
+        if (ch === 0x09) {
+          lineIndent += 4 - (lineIndent + this.bsCount[line]) % 4;
+        } else {
+          lineIndent++;
+        }
+      } else if (first - lineStart < this.tShift[line]) {
+        // patched tShift masked characters to look like spaces (blockquotes, list markers)
+        lineIndent++;
+      } else {
+        break;
+      }
+
+      first++;
+    }
+
+    if (lineIndent > indent) {
+      // partially expanding tabs in code blocks, e.g '\t\tfoobar'
+      // with indent=2 becomes '  \tfoobar'
+      queue[i] = new Array(lineIndent - indent + 1).join(' ') + this.src.slice(first, last);
+    } else {
+      queue[i] = this.src.slice(first, last);
+    }
+  }
+
+  return queue.join('');
+};
+
+// re-export Token class to use in block rules
+StateBlock.prototype.Token = Token;
+
+
+module.exports = StateBlock;