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// packages/block-serialization-spec-parser/parser.js
  var require_parser = __commonJS({
    "packages/block-serialization-spec-parser/parser.js"(exports, module) {
      function peg$subclass(child, parent) {
        function ctor() {
          this.constructor = child;
        }
        ctor.prototype = parent.prototype;
        child.prototype = new ctor();
      }
      function peg$SyntaxError(message, expected, found, location) {
        this.message = message;
        this.expected = expected;
        this.found = found;
        this.location = location;
        this.name = "SyntaxError";
        if (typeof Error.captureStackTrace === "function") {
          Error.captureStackTrace(this, peg$SyntaxError);
        }
      }
      peg$subclass(peg$SyntaxError, Error);
      peg$SyntaxError.buildMessage = function(expected, found) {
        var DESCRIBE_EXPECTATION_FNS = {
          literal: function(expectation) {
            return '"' + literalEscape(expectation.text) + '"';
          },
          "class": function(expectation) {
            var escapedParts = "", i;
            for (i = 0; i < expectation.parts.length; i++) {
              escapedParts += expectation.parts[i] instanceof Array ? classEscape(expectation.parts[i][0]) + "-" + classEscape(expectation.parts[i][1]) : classEscape(expectation.parts[i]);
            }
            return "[" + (expectation.inverted ? "^" : "") + escapedParts + "]";
          },
          any: function(expectation) {
            return "any character";
          },
          end: function(expectation) {
            return "end of input";
          },
          other: function(expectation) {
            return expectation.description;
          }
        };
        function hex(ch) {
          return ch.charCodeAt(0).toString(16).toUpperCase();
        }
        function literalEscape(s) {
          return s.replace(/\\/g, "\\\\").replace(/"/g, '\\"').replace(/\0/g, "\\0").replace(/\t/g, "\\t").replace(/\n/g, "\\n").replace(/\r/g, "\\r").replace(/[\x00-\x0F]/g, function(ch) {
            return "\\x0" + hex(ch);
          }).replace(/[\x10-\x1F\x7F-\x9F]/g, function(ch) {
            return "\\x" + hex(ch);
          });
        }
        function classEscape(s) {
          return s.replace(/\\/g, "\\\\").replace(/\]/g, "\\]").replace(/\^/g, "\\^").replace(/-/g, "\\-").replace(/\0/g, "\\0").replace(/\t/g, "\\t").replace(/\n/g, "\\n").replace(/\r/g, "\\r").replace(/[\x00-\x0F]/g, function(ch) {
            return "\\x0" + hex(ch);
          }).replace(/[\x10-\x1F\x7F-\x9F]/g, function(ch) {
            return "\\x" + hex(ch);
          });
        }
        function describeExpectation(expectation) {
          return DESCRIBE_EXPECTATION_FNS[expectation.type](expectation);
        }
        function describeExpected(expected2) {
          var descriptions = new Array(expected2.length), i, j;
          for (i = 0; i < expected2.length; i++) {
            descriptions[i] = describeExpectation(expected2[i]);
          }
          descriptions.sort();
          if (descriptions.length > 0) {
            for (i = 1, j = 1; i < descriptions.length; i++) {
              if (descriptions[i - 1] !== descriptions[i]) {
                descriptions[j] = descriptions[i];
                j++;
              }
            }
            descriptions.length = j;
          }
          switch (descriptions.length) {
            case 1:
              return descriptions[0];
            case 2:
              return descriptions[0] + " or " + descriptions[1];
            default:
              return descriptions.slice(0, -1).join(", ") + ", or " + descriptions[descriptions.length - 1];
          }
        }
        function describeFound(found2) {
          return found2 ? '"' + literalEscape(found2) + '"' : "end of input";
        }
        return "Expected " + describeExpected(expected) + " but " + describeFound(found) + " found.";
      };
      function peg$parse(input, options) {
        options = options !== void 0 ? options : {};
        var peg$FAILED = {}, peg$startRuleFunctions = { Block_List: peg$parseBlock_List }, peg$startRuleFunction = peg$parseBlock_List, peg$c0 = peg$anyExpectation(), peg$c1 = function(pre, b, html) {
          return [b, html];
        }, peg$c2 = function(pre, bs, post) {
          return joinBlocks(pre, bs, post);
        }, peg$c3 = "", peg$c9 = peg$literalExpectation("/-->", false), peg$c10 = function(blockName, attrs) {
          return {
            blockName,
            attrs: attrs || {},
            innerBlocks: [],
            innerHTML: "",
            innerContent: []
          };
        }, peg$c11 = function(s, children, e) {
          var innerParts = processInnerContent(children);
          var innerHTML = innerParts[0];
          var innerBlocks = innerParts[1];
          var innerContent = innerParts[2];
          return {
            blockName: s.blockName,
            attrs: s.attrs,
            innerBlocks,
            innerHTML,
            innerContent
          };
        }, peg$c12 = "-->", peg$c13 = peg$literalExpectation("-->", false), peg$c14 = function(blockName, attrs) {
          return {
            blockName,
            attrs: attrs || {}
          };
        }, peg$c15 = "/wp:", peg$c16 = peg$literalExpectation("/wp:", false), peg$c17 = function(blockName) {
          return {
            blockName
          };
        }, peg$c18 = "/", peg$c19 = peg$literalExpectation("/", false), peg$c20 = function(type) {
          return "core/" + type;
        }, peg$c21 = /^[a-z]/, peg$c22 = peg$classExpectation([["a", "z"]], false, false), peg$c23 = /^[a-z0-9_\-]/, peg$c24 = peg$classExpectation([["a", "z"], ["0", "9"], "_", "-"], false, false), peg$c25 = peg$otherExpectation("JSON-encoded attributes embedded in a block's opening comment"), peg$c26 = "{", peg$c27 = peg$literalExpectation("{", false), peg$c28 = "}", peg$c29 = peg$literalExpectation("}", false), peg$c30 = "", peg$c31 = function(attrs) {
          return maybeJSON(attrs);
        }, peg$c32 = /^[ \t\r\n]/, peg$c33 = peg$classExpectation([" ", "	", "\r", "\n"], false, false), peg$currPos = 0, peg$savedPos = 0, peg$posDetailsCache = [{ line: 1, column: 1 }], peg$maxFailPos = 0, peg$maxFailExpected = [], peg$silentFails = 0, peg$result;
        if ("startRule" in options) {
          if (!(options.startRule in peg$startRuleFunctions)) {
            throw new Error(`Can't start parsing from rule "` + options.startRule + '".');
          }
          peg$startRuleFunction = peg$startRuleFunctions[options.startRule];
        }
        function text() {
          return input.substring(peg$savedPos, peg$currPos);
        }
        function location() {
          return peg$computeLocation(peg$savedPos, peg$currPos);
        }
        function expected(description, location2) {
          location2 = location2 !== void 0 ? location2 : peg$computeLocation(peg$savedPos, peg$currPos);
          throw peg$buildStructuredError(
            [peg$otherExpectation(description)],
            input.substring(peg$savedPos, peg$currPos),
            location2
          );
        }
        function error(message, location2) {
          location2 = location2 !== void 0 ? location2 : peg$computeLocation(peg$savedPos, peg$currPos);
          throw peg$buildSimpleError(message, location2);
        }
        function peg$literalExpectation(text2, ignoreCase) {
          return { type: "literal", text: text2, ignoreCase };
        }
        function peg$classExpectation(parts, inverted, ignoreCase) {
          return { type: "class", parts, inverted, ignoreCase };
        }
        function peg$anyExpectation() {
          return { type: "any" };
        }
        function peg$endExpectation() {
          return { type: "end" };
        }
        function peg$otherExpectation(description) {
          return { type: "other", description };
        }
        function peg$computePosDetails(pos) {
          var details = peg$posDetailsCache[pos], p;
          if (details) {
            return details;
          } else {
            p = pos - 1;
            while (!peg$posDetailsCache[p]) {
              p--;
            }
            details = peg$posDetailsCache[p];
            details = {
              line: details.line,
              column: details.column
            };
            while (p < pos) {
              if (input.charCodeAt(p) === 10) {
                details.line++;
                details.column = 1;
              } else {
                details.column++;
              }
              p++;
            }
            peg$posDetailsCache[pos] = details;
            return details;
          }
        }
        function peg$computeLocation(startPos, endPos) {
          var startPosDetails = peg$computePosDetails(startPos), endPosDetails = peg$computePosDetails(endPos);
          return {
            start: {
              offset: startPos,
              line: startPosDetails.line,
              column: startPosDetails.column
            },
            end: {
              offset: endPos,
              line: endPosDetails.line,
              column: endPosDetails.column
            }
          };
        }
        function peg$fail(expected2) {
          if (peg$currPos < peg$maxFailPos) {
            return;
          }
          if (peg$currPos > peg$maxFailPos) {
            peg$maxFailPos = peg$currPos;
            peg$maxFailExpected = [];
          }
          peg$maxFailExpected.push(expected2);
        }
        function peg$buildSimpleError(message, location2) {
          return new peg$SyntaxError(message, null, null, location2);
        }
        function peg$buildStructuredError(expected2, found, location2) {
          return new peg$SyntaxError(
            peg$SyntaxError.buildMessage(expected2, found),
            expected2,
            found,
            location2
          );
        }
        function peg$parseBlock_List() {
          var s0, s1, s2, s3, s4, s5, s6, s7, s8, s9;
          s0 = peg$currPos;
          s1 = peg$currPos;
          s2 = [];
          s3 = peg$currPos;
          s4 = peg$currPos;
          peg$silentFails++;
          s5 = peg$parseBlock();
          peg$silentFails--;
          if (s5 === peg$FAILED) {
            s4 = void 0;
          } else {
            peg$currPos = s4;
            s4 = peg$FAILED;
          }
          if (s4 !== peg$FAILED) {
            if (input.length > peg$currPos) {
              s5 = input.charAt(peg$currPos);
              peg$currPos++;
            } else {
              s5 = peg$FAILED;
              if (peg$silentFails === 0) {
                peg$fail(peg$c0);
              }
            }
            if (s5 !== peg$FAILED) {
              s4 = [s4, s5];
              s3 = s4;
            } else {
              peg$currPos = s3;
              s3 = peg$FAILED;
            }
          } else {
            peg$currPos = s3;
            s3 = peg$FAILED;
          }
          while (s3 !== peg$FAILED) {
            s2.push(s3);
            s3 = peg$currPos;
            s4 = peg$currPos;
            peg$silentFails++;
            s5 = peg$parseBlock();
            peg$silentFails--;
            if (s5 === peg$FAILED) {
              s4 = void 0;
            } else {
              peg$currPos = s4;
              s4 = peg$FAILED;
            }
            if (s4 !== peg$FAILED) {
              if (input.length > peg$currPos) {
                s5 = input.charAt(peg$currPos);
                peg$currPos++;
              } else {
                s5 = peg$FAILED;
                if (peg$silentFails === 0) {
                  peg$fail(peg$c0);
                }
              }
              if (s5 !== peg$FAILED) {
                s4 = [s4, s5];
                s3 = s4;
              } else {
                peg$currPos = s3;
                s3 = peg$FAILED;
              }
            } else {
              peg$currPos = s3;
              s3 = peg$FAILED;
            }
          }
          if (s2 !== peg$FAILED) {
            s1 = input.substring(s1, peg$currPos);
          } else {
            s1 = s2;
          }
          if (s1 !== peg$FAILED) {
            s2 = [];
            s3 = peg$currPos;
            s4 = peg$parseBlock();
            if (s4 !== peg$FAILED) {
              s5 = peg$currPos;
              s6 = [];
              s7 = peg$currPos;
              s8 = peg$currPos;
              peg$silentFails++;
              s9 = peg$parseBlock();
              peg$silentFails--;
              if (s9 === peg$FAILED) {
                s8 = void 0;
              } else {
                peg$currPos = s8;
                s8 = peg$FAILED;
              }
              if (s8 !== peg$FAILED) {
                if (input.length > peg$currPos) {
                  s9 = input.charAt(peg$currPos);
                  peg$currPos++;
                } else {
                  s9 = peg$FAILED;
                  if (peg$silentFails === 0) {
                    peg$fail(peg$c0);
                  }
                }
                if (s9 !== peg$FAILED) {
                  s8 = [s8, s9];
                  s7 = s8;
                } else {
                  peg$currPos = s7;
                  s7 = peg$FAILED;
                }
              } else {
                peg$currPos = s7;
                s7 = peg$FAILED;
              }
              while (s7 !== peg$FAILED) {
                s6.push(s7);
                s7 = peg$currPos;
                s8 = peg$currPos;
                peg$silentFails++;
                s9 = peg$parseBlock();
                peg$silentFails--;
                if (s9 === peg$FAILED) {
                  s8 = void 0;
                } else {
                  peg$currPos = s8;
                  s8 = peg$FAILED;
                }
                if (s8 !== peg$FAILED) {
                  if (input.length > peg$currPos) {
                    s9 = input.charAt(peg$currPos);
                    peg$currPos++;
                  } else {
                    s9 = peg$FAILED;
                    if (peg$silentFails === 0) {
                      peg$fail(peg$c0);
                    }
                  }
                  if (s9 !== peg$FAILED) {
                    s8 = [s8, s9];
                    s7 = s8;
                  } else {
                    peg$currPos = s7;
                    s7 = peg$FAILED;
                  }
                } else {
                  peg$currPos = s7;
                  s7 = peg$FAILED;
                }
              }
              if (s6 !== peg$FAILED) {
                s5 = input.substring(s5, peg$currPos);
              } else {
                s5 = s6;
              }
              if (s5 !== peg$FAILED) {
                peg$savedPos = s3;
                s4 = peg$c1(s1, s4, s5);
                s3 = s4;
              } else {
                peg$currPos = s3;
                s3 = peg$FAILED;
              }
            } else {
              peg$currPos = s3;
              s3 = peg$FAILED;
            }
            while (s3 !== peg$FAILED) {
              s2.push(s3);
              s3 = peg$currPos;
              s4 = peg$parseBlock();
              if (s4 !== peg$FAILED) {
                s5 = peg$currPos;
                s6 = [];
                s7 = peg$currPos;
                s8 = peg$currPos;
                peg$silentFails++;
                s9 = peg$parseBlock();
                peg$silentFails--;
                if (s9 === peg$FAILED) {
                  s8 = void 0;
                } else {
                  peg$currPos = s8;
                  s8 = peg$FAILED;
                }
                if (s8 !== peg$FAILED) {
                  if (input.length > peg$currPos) {
                    s9 = input.charAt(peg$currPos);
                    peg$currPos++;
                  } else {
                    s9 = peg$FAILED;
                    if (peg$silentFails === 0) {
                      peg$fail(peg$c0);
                    }
                  }
                  if (s9 !== peg$FAILED) {
                    s8 = [s8, s9];
                    s7 = s8;
                  } else {
                    peg$currPos = s7;
                    s7 = peg$FAILED;
                  }
                } else {
                  peg$currPos = s7;
                  s7 = peg$FAILED;
                }
                while (s7 !== peg$FAILED) {
                  s6.push(s7);
                  s7 = peg$currPos;
                  s8 = peg$currPos;
                  peg$silentFails++;
                  s9 = peg$parseBlock();
                  peg$silentFails--;
                  if (s9 === peg$FAILED) {
                    s8 = void 0;
                  } else {
                    peg$currPos = s8;
                    s8 = peg$FAILED;
                  }
                  if (s8 !== peg$FAILED) {
                    if (input.length > peg$currPos) {
                      s9 = input.charAt(peg$currPos);
                      peg$currPos++;
                    } else {
                      s9 = peg$FAILED;
                      if (peg$silentFails === 0) {
                        peg$fail(peg$c0);
                      }
                    }
                    if (s9 !== peg$FAILED) {
                      s8 = [s8, s9];
                      s7 = s8;
                    } else {
                      peg$currPos = s7;
                      s7 = peg$FAILED;
                    }
                  } else {
                    peg$currPos = s7;
                    s7 = peg$FAILED;
                  }
                }
                if (s6 !== peg$FAILED) {
                  s5 = input.substring(s5, peg$currPos);
                } else {
                  s5 = s6;
                }
                if (s5 !== peg$FAILED) {
                  peg$savedPos = s3;
                  s4 = peg$c1(s1, s4, s5);
                  s3 = s4;
                } else {
                  peg$currPos = s3;
                  s3 = peg$FAILED;
                }
              } else {
                peg$currPos = s3;
                s3 = peg$FAILED;
              }
            }
            if (s2 !== peg$FAILED) {
              s3 = peg$currPos;
              s4 = [];
              if (input.length > peg$currPos) {
                s5 = input.charAt(peg$currPos);
                peg$currPos++;
              } else {
                s5 = peg$FAILED;
                if (peg$silentFails === 0) {
                  peg$fail(peg$c0);
                }
              }
              while (s5 !== peg$FAILED) {
                s4.push(s5);
                if (input.length > peg$currPos) {
                  s5 = input.charAt(peg$currPos);
                  peg$currPos++;
                } else {
                  s5 = peg$FAILED;
                  if (peg$silentFails === 0) {
                    peg$fail(peg$c0);
                  }
                }
              }
              if (s4 !== peg$FAILED) {
                s3 = input.substring(s3, peg$currPos);
              } else {
                s3 = s4;
              }
              if (s3 !== peg$FAILED) {
                peg$savedPos = s0;
                s1 = peg$c2(s1, s2, s3);
                s0 = s1;
              } else {
                peg$currPos = s0;
                s0 = peg$FAILED;
              }
            } else {
              peg$currPos = s0;
              s0 = peg$FAILED;
            }
          } else {
            peg$currPos = s0;
            s0 = peg$FAILED;
          }
          return s0;
        }
        function peg$parseBlock() {
          var s0;
          s0 = peg$parseBlock_Void();
          if (s0 === peg$FAILED) {
            s0 = peg$parseBlock_Balanced();
          }
          return s0;
        }
        function peg$parseBlock_Void() {
          var s0, s1, s2, s3, s4, s5, s6, s7, s8;
          s0 = peg$currPos;
          if (input.substr(peg$currPos, 4) === peg$c3) {
            s1 = peg$c3;
            peg$currPos += 4;
          } else {
            s1 = peg$FAILED;
            if (peg$silentFails === 0) {
              peg$fail(peg$c4);
            }
          }
          if (s1 !== peg$FAILED) {
            s2 = peg$parse__();
            if (s2 !== peg$FAILED) {
              if (input.substr(peg$currPos, 3) === peg$c5) {
                s3 = peg$c5;
                peg$currPos += 3;
              } else {
                s3 = peg$FAILED;
                if (peg$silentFails === 0) {
                  peg$fail(peg$c6);
                }
              }
              if (s3 !== peg$FAILED) {
                s4 = peg$parseBlock_Name();
                if (s4 !== peg$FAILED) {
                  s5 = peg$parse__();
                  if (s5 !== peg$FAILED) {
                    s6 = peg$currPos;
                    s7 = peg$parseBlock_Attributes();
                    if (s7 !== peg$FAILED) {
                      s8 = peg$parse__();
                      if (s8 !== peg$FAILED) {
                        peg$savedPos = s6;
                        s7 = peg$c7(s4, s7);
                        s6 = s7;
                      } else {
                        peg$currPos = s6;
                        s6 = peg$FAILED;
                      }
                    } else {
                      peg$currPos = s6;
                      s6 = peg$FAILED;
                    }
                    if (s6 === peg$FAILED) {
                      s6 = null;
                    }
                    if (s6 !== peg$FAILED) {
                      if (input.substr(peg$currPos, 4) === peg$c8) {
                        s7 = peg$c8;
                        peg$currPos += 4;
                      } else {
                        s7 = peg$FAILED;
                        if (peg$silentFails === 0) {
                          peg$fail(peg$c9);
                        }
                      }
                      if (s7 !== peg$FAILED) {
                        peg$savedPos = s0;
                        s1 = peg$c10(s4, s6);
                        s0 = s1;
                      } else {
                        peg$currPos = s0;
                        s0 = peg$FAILED;
                      }
                    } else {
                      peg$currPos = s0;
                      s0 = peg$FAILED;
                    }
                  } else {
                    peg$currPos = s0;
                    s0 = peg$FAILED;
                  }
                } else {
                  peg$currPos = s0;
                  s0 = peg$FAILED;
                }
              } else {
                peg$currPos = s0;
                s0 = peg$FAILED;
              }
            } else {
              peg$currPos = s0;
              s0 = peg$FAILED;
            }
          } else {
            peg$currPos = s0;
            s0 = peg$FAILED;
          }
          return s0;
        }
        function peg$parseBlock_Balanced() {
          var s0, s1, s2, s3, s4, s5, s6, s7, s8;
          s0 = peg$currPos;
          s1 = peg$parseBlock_Start();
          if (s1 !== peg$FAILED) {
            s2 = [];
            s3 = peg$parseBlock();
            if (s3 === peg$FAILED) {
              s3 = peg$currPos;
              s4 = [];
              s5 = peg$currPos;
              s6 = peg$currPos;
              peg$silentFails++;
              s7 = peg$parseBlock();
              peg$silentFails--;
              if (s7 === peg$FAILED) {
                s6 = void 0;
              } else {
                peg$currPos = s6;
                s6 = peg$FAILED;
              }
              if (s6 !== peg$FAILED) {
                s7 = peg$currPos;
                peg$silentFails++;
                s8 = peg$parseBlock_End();
                peg$silentFails--;
                if (s8 === peg$FAILED) {
                  s7 = void 0;
                } else {
                  peg$currPos = s7;
                  s7 = peg$FAILED;
                }
                if (s7 !== peg$FAILED) {
                  if (input.length > peg$currPos) {
                    s8 = input.charAt(peg$currPos);
                    peg$currPos++;
                  } else {
                    s8 = peg$FAILED;
                    if (peg$silentFails === 0) {
                      peg$fail(peg$c0);
                    }
                  }
                  if (s8 !== peg$FAILED) {
                    s6 = [s6, s7, s8];
                    s5 = s6;
                  } else {
                    peg$currPos = s5;
                    s5 = peg$FAILED;
                  }
                } else {
                  peg$currPos = s5;
                  s5 = peg$FAILED;
                }
              } else {
                peg$currPos = s5;
                s5 = peg$FAILED;
              }
              if (s5 !== peg$FAILED) {
                while (s5 !== peg$FAILED) {
                  s4.push(s5);
                  s5 = peg$currPos;
                  s6 = peg$currPos;
                  peg$silentFails++;
                  s7 = peg$parseBlock();
                  peg$silentFails--;
                  if (s7 === peg$FAILED) {
                    s6 = void 0;
                  } else {
                    peg$currPos = s6;
                    s6 = peg$FAILED;
                  }
                  if (s6 !== peg$FAILED) {
                    s7 = peg$currPos;
                    peg$silentFails++;
                    s8 = peg$parseBlock_End();
                    peg$silentFails--;
                    if (s8 === peg$FAILED) {
                      s7 = void 0;
                    } else {
                      peg$currPos = s7;
                      s7 = peg$FAILED;
                    }
                    if (s7 !== peg$FAILED) {
                      if (input.length > peg$currPos) {
                        s8 = input.charAt(peg$currPos);
                        peg$currPos++;
                      } else {
                        s8 = peg$FAILED;
                        if (peg$silentFails === 0) {
                          peg$fail(peg$c0);
                        }
                      }
                      if (s8 !== peg$FAILED) {
                        s6 = [s6, s7, s8];
                        s5 = s6;
                      } else {
                        peg$currPos = s5;
                        s5 = peg$FAILED;
                      }
                    } else {
                      peg$currPos = s5;
                      s5 = peg$FAILED;
                    }
                  } else {
                    peg$currPos = s5;
                    s5 = peg$FAILED;
                  }
                }
              } else {
                s4 = peg$FAILED;
              }
              if (s4 !== peg$FAILED) {
                s3 = input.substring(s3, peg$currPos);
              } else {
                s3 = s4;
              }
            }
            while (s3 !== peg$FAILED) {
              s2.push(s3);
              s3 = peg$parseBlock();
              if (s3 === peg$FAILED) {
                s3 = peg$currPos;
                s4 = [];
                s5 = peg$currPos;
                s6 = peg$currPos;
                peg$silentFails++;
                s7 = peg$parseBlock();
                peg$silentFails--;
                if (s7 === peg$FAILED) {
                  s6 = void 0;
                } else {
                  peg$currPos = s6;
                  s6 = peg$FAILED;
                }
                if (s6 !== peg$FAILED) {
                  s7 = peg$currPos;
                  peg$silentFails++;
                  s8 = peg$parseBlock_End();
                  peg$silentFails--;
                  if (s8 === peg$FAILED) {
                    s7 = void 0;
                  } else {
                    peg$currPos = s7;
                    s7 = peg$FAILED;
                  }
                  if (s7 !== peg$FAILED) {
                    if (input.length > peg$currPos) {
                      s8 = input.charAt(peg$currPos);
                      peg$currPos++;
                    } else {
                      s8 = peg$FAILED;
                      if (peg$silentFails === 0) {
                        peg$fail(peg$c0);
                      }
                    }
                    if (s8 !== peg$FAILED) {
                      s6 = [s6, s7, s8];
                      s5 = s6;
                    } else {
                      peg$currPos = s5;
                      s5 = peg$FAILED;
                    }
                  } else {
                    peg$currPos = s5;
                    s5 = peg$FAILED;
                  }
                } else {
                  peg$currPos = s5;
                  s5 = peg$FAILED;
                }
                if (s5 !== peg$FAILED) {
                  while (s5 !== peg$FAILED) {
                    s4.push(s5);
                    s5 = peg$currPos;
                    s6 = peg$currPos;
                    peg$silentFails++;
                    s7 = peg$parseBlock();
                    peg$silentFails--;
                    if (s7 === peg$FAILED) {
                      s6 = void 0;
                    } else {
                      peg$currPos = s6;
                      s6 = peg$FAILED;
                    }
                    if (s6 !== peg$FAILED) {
                      s7 = peg$currPos;
                      peg$silentFails++;
                      s8 = peg$parseBlock_End();
                      peg$silentFails--;
                      if (s8 === peg$FAILED) {
                        s7 = void 0;
                      } else {
                        peg$currPos = s7;
                        s7 = peg$FAILED;
                      }
                      if (s7 !== peg$FAILED) {
                        if (input.length > peg$currPos) {
                          s8 = input.charAt(peg$currPos);
                          peg$currPos++;
                        } else {
                          s8 = peg$FAILED;
                          if (peg$silentFails === 0) {
                            peg$fail(peg$c0);
                          }
                        }
                        if (s8 !== peg$FAILED) {
                          s6 = [s6, s7, s8];
                          s5 = s6;
                        } else {
                          peg$currPos = s5;
                          s5 = peg$FAILED;
                        }
                      } else {
                        peg$currPos = s5;
                        s5 = peg$FAILED;
                      }
                    } else {
                      peg$currPos = s5;
                      s5 = peg$FAILED;
                    }
                  }
                } else {
                  s4 = peg$FAILED;
                }
                if (s4 !== peg$FAILED) {
                  s3 = input.substring(s3, peg$currPos);
                } else {
                  s3 = s4;
                }
              }
            }
            if (s2 !== peg$FAILED) {
              s3 = peg$parseBlock_End();
              if (s3 !== peg$FAILED) {
                peg$savedPos = s0;
                s1 = peg$c11(s1, s2, s3);
                s0 = s1;
              } else {
                peg$currPos = s0;
                s0 = peg$FAILED;
              }
            } else {
              peg$currPos = s0;
              s0 = peg$FAILED;
            }
          } else {
            peg$currPos = s0;
            s0 = peg$FAILED;
          }
          return s0;
        }
        function peg$parseBlock_Start() {
          var s0, s1, s2, s3, s4, s5, s6, s7, s8;
          s0 = peg$currPos;
          if (input.substr(peg$currPos, 4) === peg$c3) {
            s1 = peg$c3;
            peg$currPos += 4;
          } else {
            s1 = peg$FAILED;
            if (peg$silentFails === 0) {
              peg$fail(peg$c4);
            }
          }
          if (s1 !== peg$FAILED) {
            s2 = peg$parse__();
            if (s2 !== peg$FAILED) {
              if (input.substr(peg$currPos, 3) === peg$c5) {
                s3 = peg$c5;
                peg$currPos += 3;
              } else {
                s3 = peg$FAILED;
                if (peg$silentFails === 0) {
                  peg$fail(peg$c6);
                }
              }
              if (s3 !== peg$FAILED) {
                s4 = peg$parseBlock_Name();
                if (s4 !== peg$FAILED) {
                  s5 = peg$parse__();
                  if (s5 !== peg$FAILED) {
                    s6 = peg$currPos;
                    s7 = peg$parseBlock_Attributes();
                    if (s7 !== peg$FAILED) {
                      s8 = peg$parse__();
                      if (s8 !== peg$FAILED) {
                        peg$savedPos = s6;
                        s7 = peg$c7(s4, s7);
                        s6 = s7;
                      } else {
                        peg$currPos = s6;
                        s6 = peg$FAILED;
                      }
                    } else {
                      peg$currPos = s6;
                      s6 = peg$FAILED;
                    }
                    if (s6 === peg$FAILED) {
                      s6 = null;
                    }
                    if (s6 !== peg$FAILED) {
                      if (input.substr(peg$currPos, 3) === peg$c12) {
                        s7 = peg$c12;
                        peg$currPos += 3;
                      } else {
                        s7 = peg$FAILED;
                        if (peg$silentFails === 0) {
                          peg$fail(peg$c13);
                        }
                      }
                      if (s7 !== peg$FAILED) {
                        peg$savedPos = s0;
                        s1 = peg$c14(s4, s6);
                        s0 = s1;
                      } else {
                        peg$currPos = s0;
                        s0 = peg$FAILED;
                      }
                    } else {
                      peg$currPos = s0;
                      s0 = peg$FAILED;
                    }
                  } else {
                    peg$currPos = s0;
                    s0 = peg$FAILED;
                  }
                } else {
                  peg$currPos = s0;
                  s0 = peg$FAILED;
                }
              } else {
                peg$currPos = s0;
                s0 = peg$FAILED;
              }
            } else {
              peg$currPos = s0;
              s0 = peg$FAILED;
            }
          } else {
            peg$currPos = s0;
            s0 = peg$FAILED;
          }
          return s0;
        }
        function peg$parseBlock_End() {
          var s0, s1, s2, s3, s4, s5, s6;
          s0 = peg$currPos;
          if (input.substr(peg$currPos, 4) === peg$c3) {
            s1 = peg$c3;
            peg$currPos += 4;
          } else {
            s1 = peg$FAILED;
            if (peg$silentFails === 0) {
              peg$fail(peg$c4);
            }
          }
          if (s1 !== peg$FAILED) {
            s2 = peg$parse__();
            if (s2 !== peg$FAILED) {
              if (input.substr(peg$currPos, 4) === peg$c15) {
                s3 = peg$c15;
                peg$currPos += 4;
              } else {
                s3 = peg$FAILED;
                if (peg$silentFails === 0) {
                  peg$fail(peg$c16);
                }
              }
              if (s3 !== peg$FAILED) {
                s4 = peg$parseBlock_Name();
                if (s4 !== peg$FAILED) {
                  s5 = peg$parse__();
                  if (s5 !== peg$FAILED) {
                    if (input.substr(peg$currPos, 3) === peg$c12) {
                      s6 = peg$c12;
                      peg$currPos += 3;
                    } else {
                      s6 = peg$FAILED;
                      if (peg$silentFails === 0) {
                        peg$fail(peg$c13);
                      }
                    }
                    if (s6 !== peg$FAILED) {
                      peg$savedPos = s0;
                      s1 = peg$c17(s4);
                      s0 = s1;
                    } else {
                      peg$currPos = s0;
                      s0 = peg$FAILED;
                    }
                  } else {
                    peg$currPos = s0;
                    s0 = peg$FAILED;
                  }
                } else {
                  peg$currPos = s0;
                  s0 = peg$FAILED;
                }
              } else {
                peg$currPos = s0;
                s0 = peg$FAILED;
              }
            } else {
              peg$currPos = s0;
              s0 = peg$FAILED;
            }
          } else {
            peg$currPos = s0;
            s0 = peg$FAILED;
          }
          return s0;
        }
        function peg$parseBlock_Name() {
          var s0;
          s0 = peg$parseNamespaced_Block_Name();
          if (s0 === peg$FAILED) {
            s0 = peg$parseCore_Block_Name();
          }
          return s0;
        }
        function peg$parseNamespaced_Block_Name() {
          var s0, s1, s2, s3, s4;
          s0 = peg$currPos;
          s1 = peg$currPos;
          s2 = peg$parseBlock_Name_Part();
          if (s2 !== peg$FAILED) {
            if (input.charCodeAt(peg$currPos) === 47) {
              s3 = peg$c18;
              peg$currPos++;
            } else {
              s3 = peg$FAILED;
              if (peg$silentFails === 0) {
                peg$fail(peg$c19);
              }
            }
            if (s3 !== peg$FAILED) {
              s4 = peg$parseBlock_Name_Part();
              if (s4 !== peg$FAILED) {
                s2 = [s2, s3, s4];
                s1 = s2;
              } else {
                peg$currPos = s1;
                s1 = peg$FAILED;
              }
            } else {
              peg$currPos = s1;
              s1 = peg$FAILED;
            }
          } else {
            peg$currPos = s1;
            s1 = peg$FAILED;
          }
          if (s1 !== peg$FAILED) {
            s0 = input.substring(s0, peg$currPos);
          } else {
            s0 = s1;
          }
          return s0;
        }
        function peg$parseCore_Block_Name() {
          var s0, s1, s2;
          s0 = peg$currPos;
          s1 = peg$currPos;
          s2 = peg$parseBlock_Name_Part();
          if (s2 !== peg$FAILED) {
            s1 = input.substring(s1, peg$currPos);
          } else {
            s1 = s2;
          }
          if (s1 !== peg$FAILED) {
            peg$savedPos = s0;
            s1 = peg$c20(s1);
          }
          s0 = s1;
          return s0;
        }
        function peg$parseBlock_Name_Part() {
          var s0, s1, s2, s3, s4;
          s0 = peg$currPos;
          s1 = peg$currPos;
          if (peg$c21.test(input.charAt(peg$currPos))) {
            s2 = input.charAt(peg$currPos);
            peg$currPos++;
          } else {
            s2 = peg$FAILED;
            if (peg$silentFails === 0) {
              peg$fail(peg$c22);
            }
          }
          if (s2 !== peg$FAILED) {
            s3 = [];
            if (peg$c23.test(input.charAt(peg$currPos))) {
              s4 = input.charAt(peg$currPos);
              peg$currPos++;
            } else {
              s4 = peg$FAILED;
              if (peg$silentFails === 0) {
                peg$fail(peg$c24);
              }
            }
            while (s4 !== peg$FAILED) {
              s3.push(s4);
              if (peg$c23.test(input.charAt(peg$currPos))) {
                s4 = input.charAt(peg$currPos);
                peg$currPos++;
              } else {
                s4 = peg$FAILED;
                if (peg$silentFails === 0) {
                  peg$fail(peg$c24);
                }
              }
            }
            if (s3 !== peg$FAILED) {
              s2 = [s2, s3];
              s1 = s2;
            } else {
              peg$currPos = s1;
              s1 = peg$FAILED;
            }
          } else {
            peg$currPos = s1;
            s1 = peg$FAILED;
          }
          if (s1 !== peg$FAILED) {
            s0 = input.substring(s0, peg$currPos);
          } else {
            s0 = s1;
          }
          return s0;
        }
        function peg$parseBlock_Attributes() {
          var s0, s1, s2, s3, s4, s5, s6, s7, s8, s9, s10, s11, s12;
          peg$silentFails++;
          s0 = peg$currPos;
          s1 = peg$currPos;
          s2 = peg$currPos;
          if (input.charCodeAt(peg$currPos) === 123) {
            s3 = peg$c26;
            peg$currPos++;
          } else {
            s3 = peg$FAILED;
            if (peg$silentFails === 0) {
              peg$fail(peg$c27);
            }
          }
          if (s3 !== peg$FAILED) {
            s4 = [];
            s5 = peg$currPos;
            s6 = peg$currPos;
            peg$silentFails++;
            s7 = peg$currPos;
            if (input.charCodeAt(peg$currPos) === 125) {
              s8 = peg$c28;
              peg$currPos++;
            } else {
              s8 = peg$FAILED;
              if (peg$silentFails === 0) {
                peg$fail(peg$c29);
              }
            }
            if (s8 !== peg$FAILED) {
              s9 = peg$parse__();
              if (s9 !== peg$FAILED) {
                s10 = peg$c30;
                if (s10 !== peg$FAILED) {
                  if (input.charCodeAt(peg$currPos) === 47) {
                    s11 = peg$c18;
                    peg$currPos++;
                  } else {
                    s11 = peg$FAILED;
                    if (peg$silentFails === 0) {
                      peg$fail(peg$c19);
                    }
                  }
                  if (s11 === peg$FAILED) {
                    s11 = null;
                  }
                  if (s11 !== peg$FAILED) {
                    if (input.substr(peg$currPos, 3) === peg$c12) {
                      s12 = peg$c12;
                      peg$currPos += 3;
                    } else {
                      s12 = peg$FAILED;
                      if (peg$silentFails === 0) {
                        peg$fail(peg$c13);
                      }
                    }
                    if (s12 !== peg$FAILED) {
                      s8 = [s8, s9, s10, s11, s12];
                      s7 = s8;
                    } else {
                      peg$currPos = s7;
                      s7 = peg$FAILED;
                    }
                  } else {
                    peg$currPos = s7;
                    s7 = peg$FAILED;
                  }
                } else {
                  peg$currPos = s7;
                  s7 = peg$FAILED;
                }
              } else {
                peg$currPos = s7;
                s7 = peg$FAILED;
              }
            } else {
              peg$currPos = s7;
              s7 = peg$FAILED;
            }
            peg$silentFails--;
            if (s7 === peg$FAILED) {
              s6 = void 0;
            } else {
              peg$currPos = s6;
              s6 = peg$FAILED;
            }
            if (s6 !== peg$FAILED) {
              if (input.length > peg$currPos) {
                s7 = input.charAt(peg$currPos);
                peg$currPos++;
              } else {
                s7 = peg$FAILED;
                if (peg$silentFails === 0) {
                  peg$fail(peg$c0);
                }
              }
              if (s7 !== peg$FAILED) {
                s6 = [s6, s7];
                s5 = s6;
              } else {
                peg$currPos = s5;
                s5 = peg$FAILED;
              }
            } else {
              peg$currPos = s5;
              s5 = peg$FAILED;
            }
            while (s5 !== peg$FAILED) {
              s4.push(s5);
              s5 = peg$currPos;
              s6 = peg$currPos;
              peg$silentFails++;
              s7 = peg$currPos;
              if (input.charCodeAt(peg$currPos) === 125) {
                s8 = peg$c28;
                peg$currPos++;
              } else {
                s8 = peg$FAILED;
                if (peg$silentFails === 0) {
                  peg$fail(peg$c29);
                }
              }
              if (s8 !== peg$FAILED) {
                s9 = peg$parse__();
                if (s9 !== peg$FAILED) {
                  s10 = peg$c30;
                  if (s10 !== peg$FAILED) {
                    if (input.charCodeAt(peg$currPos) === 47) {
                      s11 = peg$c18;
                      peg$currPos++;
                    } else {
                      s11 = peg$FAILED;
                      if (peg$silentFails === 0) {
                        peg$fail(peg$c19);
                      }
                    }
                    if (s11 === peg$FAILED) {
                      s11 = null;
                    }
                    if (s11 !== peg$FAILED) {
                      if (input.substr(peg$currPos, 3) === peg$c12) {
                        s12 = peg$c12;
                        peg$currPos += 3;
                      } else {
                        s12 = peg$FAILED;
                        if (peg$silentFails === 0) {
                          peg$fail(peg$c13);
                        }
                      }
                      if (s12 !== peg$FAILED) {
                        s8 = [s8, s9, s10, s11, s12];
                        s7 = s8;
                      } else {
                        peg$currPos = s7;
                        s7 = peg$FAILED;
                      }
                    } else {
                      peg$currPos = s7;
                      s7 = peg$FAILED;
                    }
                  } else {
                    peg$currPos = s7;
                    s7 = peg$FAILED;
                  }
                } else {
                  peg$currPos = s7;
                  s7 = peg$FAILED;
                }
              } else {
                peg$currPos = s7;
                s7 = peg$FAILED;
              }
              peg$silentFails--;
              if (s7 === peg$FAILED) {
                s6 = void 0;
              } else {
                peg$currPos = s6;
                s6 = peg$FAILED;
              }
              if (s6 !== peg$FAILED) {
                if (input.length > peg$currPos) {
                  s7 = input.charAt(peg$currPos);
                  peg$currPos++;
                } else {
                  s7 = peg$FAILED;
                  if (peg$silentFails === 0) {
                    peg$fail(peg$c0);
                  }
                }
                if (s7 !== peg$FAILED) {
                  s6 = [s6, s7];
                  s5 = s6;
                } else {
                  peg$currPos = s5;
                  s5 = peg$FAILED;
                }
              } else {
                peg$currPos = s5;
                s5 = peg$FAILED;
              }
            }
            if (s4 !== peg$FAILED) {
              if (input.charCodeAt(peg$currPos) === 125) {
                s5 = peg$c28;
                peg$currPos++;
              } else {
                s5 = peg$FAILED;
                if (peg$silentFails === 0) {
                  peg$fail(peg$c29);
                }
              }
              if (s5 !== peg$FAILED) {
                s3 = [s3, s4, s5];
                s2 = s3;
              } else {
                peg$currPos = s2;
                s2 = peg$FAILED;
              }
            } else {
              peg$currPos = s2;
              s2 = peg$FAILED;
            }
          } else {
            peg$currPos = s2;
            s2 = peg$FAILED;
          }
          if (s2 !== peg$FAILED) {
            s1 = input.substring(s1, peg$currPos);
          } else {
            s1 = s2;
          }
          if (s1 !== peg$FAILED) {
            peg$savedPos = s0;
            s1 = peg$c31(s1);
          }
          s0 = s1;
          peg$silentFails--;
          if (s0 === peg$FAILED) {
            s1 = peg$FAILED;
            if (peg$silentFails === 0) {
              peg$fail(peg$c25);
            }
          }
          return s0;
        }
        function peg$parse__() {
          var s0, s1;
          s0 = [];
          if (peg$c32.test(input.charAt(peg$currPos))) {
            s1 = input.charAt(peg$currPos);
            peg$currPos++;
          } else {
            s1 = peg$FAILED;
            if (peg$silentFails === 0) {
              peg$fail(peg$c33);
            }
          }
          if (s1 !== peg$FAILED) {
            while (s1 !== peg$FAILED) {
              s0.push(s1);
              if (peg$c32.test(input.charAt(peg$currPos))) {
                s1 = input.charAt(peg$currPos);
                peg$currPos++;
              } else {
                s1 = peg$FAILED;
                if (peg$silentFails === 0) {
                  peg$fail(peg$c33);
                }
              }
            }
          } else {
            s0 = peg$FAILED;
          }
          return s0;
        }
        function freeform(s) {
          return s.length && {
            blockName: null,
            attrs: {},
            innerBlocks: [],
            innerHTML: s,
            innerContent: [s]
          };
        }
        function joinBlocks(pre, tokens, post) {
          var blocks = [], i, l, html, item, token;
          if (pre.length) {
            blocks.push(freeform(pre));
          }
          for (i = 0, l = tokens.length; i < l; i++) {
            item = tokens[i];
            token = item[0];
            html = item[1];
            blocks.push(token);
            if (html.length) {
              blocks.push(freeform(html));
            }
          }
          if (post.length) {
            blocks.push(freeform(post));
          }
          return blocks;
        }
        function maybeJSON(s) {
          try {
            return JSON.parse(s);
          } catch (e) {
            return null;
          }
        }
        function processInnerContent(list) {
          var i, l, item;
          var html = "";
          var blocks = [];
          var content = [];
          for (i = 0, l = list.length; i < l; i++) {
            item = list[i];
            if ("string" === typeof item) {
              html += item;
              content.push(item);
            } else {
              blocks.push(item);
              content.push(null);
            }
          }
          ;
          return [html, blocks, content];
        }
        peg$result = peg$startRuleFunction();
        if (peg$result !== peg$FAILED && peg$currPos === input.length) {
          return peg$result;
        } else {
          if (peg$result !== peg$FAILED && peg$currPos < input.length) {
            peg$fail(peg$endExpectation());
          }
          throw peg$buildStructuredError(
            peg$maxFailExpected,
            peg$maxFailPos < input.length ? input.charAt(peg$maxFailPos) : null,
            peg$maxFailPos < input.length ? peg$computeLocation(peg$maxFailPos, peg$maxFailPos + 1) : peg$computeLocation(peg$maxFailPos, peg$maxFailPos)
          );
        }
      }
      module.exports = {
        SyntaxError: peg$SyntaxError,
        parse: peg$parse
      };
    }
  });
  return require_parser();
})();
(window.wp ||= {}).blockSerializationSpecParser = wp.blockSerializationSpecParser;
})();

Editing: block-serialization-spec-parser.js

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