fix(sentence): correct handle line number for pre-node

Author: azu

README.md

@@ -6,6 +6,11 @@ Split {Japanese, English} text into sentences.
 
     npm install sentence-splitter
 
+**Requirements:**
+
+- `Array.from`
+- `Array#fill`
+
 ### CLI
 
     $ npm install -g sentence-splitter

src/parser/SourceCode.ts

@@ -26,9 +26,11 @@ export class SourceCode {
             this.startOffset = this.sourceNode.range[0];
             // start index is startOffset
             this.index = this.startOffset;
-            const offset = Array.from(new Array(this.startOffset));
-            this.textCharacters = offset.concat(input.raw.split(""));
-            this.source = new StructureSource(input.raw);
+            // before line count of Paragraph node
+            const lineBreaks = Array.from(new Array(this.sourceNode.loc.start.line - 1)).fill("\n");
+            const offset = Array.from(new Array(this.startOffset - lineBreaks.length));
+            this.textCharacters = lineBreaks.concat(offset, input.raw.split(""));
+            this.source = new StructureSource(this.textCharacters.join(""));
             if (this.sourceNode.children[0]) {
                 // Header Node's children does not start with index 0
                 // Example: # Header

test/fixtures/first-line-is-line-break/input.json

@@ -0,0 +1,39 @@
+{
+  "type": "Paragraph",
+  "children": [
+    {
+      "type": "Str",
+      "value": "First, A is A.",
+      "loc": {
+        "start": {
+          "line": 2,
+          "column": 0
+        },
+        "end": {
+          "line": 2,
+          "column": 14
+        }
+      },
+      "range": [
+        1,
+        15
+      ],
+      "raw": "First, A is A."
+    }
+  ],
+  "loc": {
+    "start": {
+      "line": 2,
+      "column": 0
+    },
+    "end": {
+      "line": 2,
+      "column": 14
+    }
+  },
+  "range": [
+    1,
+    15
+  ],
+  "raw": "First, A is A."
+}

test/fixtures/first-line-is-line-break/output.json

@@ -0,0 +1,79 @@
+{
+    "type": "Paragraph",
+    "children": [
+        {
+            "type": "Sentence",
+            "raw": "First, A is A.",
+            "value": "First, A is A.",
+            "loc": {
+                "start": {
+                    "line": 2,
+                    "column": 0
+                },
+                "end": {
+                    "line": 2,
+                    "column": 14
+                }
+            },
+            "range": [
+                1,
+                15
+            ],
+            "children": [
+                {
+                    "type": "Str",
+                    "raw": "First, A is A",
+                    "value": "First, A is A",
+                    "loc": {
+                        "start": {
+                            "line": 2,
+                            "column": 0
+                        },
+                        "end": {
+                            "line": 2,
+                            "column": 13
+                        }
+                    },
+                    "range": [
+                        1,
+                        14
+                    ]
+                },
+                {
+                    "type": "Punctuation",
+                    "raw": ".",
+                    "value": ".",
+                    "loc": {
+                        "start": {
+                            "line": 2,
+                            "column": 13
+                        },
+                        "end": {
+                            "line": 2,
+                            "column": 14
+                        }
+                    },
+                    "range": [
+                        14,
+                        15
+                    ]
+                }
+            ]
+        }
+    ],
+    "loc": {
+        "start": {
+            "line": 2,
+            "column": 0
+        },
+        "end": {
+            "line": 2,
+            "column": 14
+        }
+    },
+    "range": [
+        1,
+        15
+    ],
+    "raw": "First, A is A."
+}

test/fixtures/list-item-paragraph/output.json

@@ -7,12 +7,12 @@
             "value": "text that follows a label, such as a Caution or Note.",
             "loc": {
                 "start": {
-                    "line": 1,
-                    "column": 90
+                    "line": 5,
+                    "column": 86
                 },
                 "end": {
-                    "line": 1,
-                    "column": 143
+                    "line": 5,
+                    "column": 139
                 }
             },
             "range": [
@@ -26,12 +26,12 @@
                     "value": "text that follows a label, such as a Caution or Note",
                     "loc": {
                         "start": {
-                            "line": 1,
-                            "column": 90
+                            "line": 5,
+                            "column": 86
                         },
                         "end": {
-                            "line": 1,
-                            "column": 142
+                            "line": 5,
+                            "column": 138
                         }
                     },
                     "range": [
@@ -45,12 +45,12 @@
                     "value": ".",
                     "loc": {
                         "start": {
-                            "line": 1,
-                            "column": 142
+                            "line": 5,
+                            "column": 138
                         },
                         "end": {
-                            "line": 1,
-                            "column": 143
+                            "line": 5,
+                            "column": 139
                         }
                     },
                     "range": [