vue hello world项目
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".split(
""
);
const CONTINUATION_BIT = 0x20;
const createMappingsSerializer = options => {
const linesOnly = options && options.columns === false;
return linesOnly
? createLinesOnlyMappingsSerializer()
: createFullMappingsSerializer();
};
const createFullMappingsSerializer = () => {
let currentLine = 1;
let currentColumn = 0;
let currentSourceIndex = 0;
let currentOriginalLine = 1;
let currentOriginalColumn = 0;
let currentNameIndex = 0;
let activeMapping = false;
let activeName = false;
let initial = true;
return (
generatedLine,
generatedColumn,
sourceIndex,
originalLine,
originalColumn,
nameIndex
) => {
if (activeMapping && currentLine === generatedLine) {
// A mapping is still active
if (
sourceIndex === currentSourceIndex &&
originalLine === currentOriginalLine &&
originalColumn === currentOriginalColumn &&
!activeName &&
nameIndex < 0
) {
// avoid repeating the same original mapping
return "";
}
} else {
// No mapping is active
if (sourceIndex < 0) {
// avoid writing unneccessary generated mappings
return "";
}
}
let str;
if (currentLine < generatedLine) {
str = ";".repeat(generatedLine - currentLine);
currentLine = generatedLine;
currentColumn = 0;
initial = false;
} else if (initial) {
str = "";
initial = false;
} else {
str = ",";
}
const writeValue = value => {
const sign = (value >>> 31) & 1;
const mask = value >> 31;
const absValue = (value + mask) ^ mask;
let data = (absValue << 1) | sign;
for (;;) {
const sextet = data & 0x1f;
data >>= 5;
if (data === 0) {
str += ALPHABET[sextet];
break;
} else {
str += ALPHABET[sextet | CONTINUATION_BIT];
}
}
};
writeValue(generatedColumn - currentColumn);
currentColumn = generatedColumn;
if (sourceIndex >= 0) {
activeMapping = true;
if (sourceIndex === currentSourceIndex) {
str += "A";
} else {
writeValue(sourceIndex - currentSourceIndex);
currentSourceIndex = sourceIndex;
}
writeValue(originalLine - currentOriginalLine);
currentOriginalLine = originalLine;
if (originalColumn === currentOriginalColumn) {
str += "A";
} else {
writeValue(originalColumn - currentOriginalColumn);
currentOriginalColumn = originalColumn;
}
if (nameIndex >= 0) {
writeValue(nameIndex - currentNameIndex);
currentNameIndex = nameIndex;
activeName = true;
} else {
activeName = false;
}
} else {
activeMapping = false;
}
return str;
};
};
const createLinesOnlyMappingsSerializer = () => {
let lastWrittenLine = 0;
let currentLine = 1;
let currentSourceIndex = 0;
let currentOriginalLine = 1;
return (
generatedLine,
_generatedColumn,
sourceIndex,
originalLine,
_originalColumn,
_nameIndex
) => {
if (sourceIndex < 0) {
// avoid writing generated mappings at all
return "";
}
if (lastWrittenLine === generatedLine) {
// avoid writing multiple original mappings per line
return "";
}
let str;
const writeValue = value => {
const sign = (value >>> 31) & 1;
const mask = value >> 31;
const absValue = (value + mask) ^ mask;
let data = (absValue << 1) | sign;
for (;;) {
const sextet = data & 0x1f;
data >>= 5;
if (data === 0) {
str += ALPHABET[sextet];
break;
} else {
str += ALPHABET[sextet | CONTINUATION_BIT];
}
}
};
lastWrittenLine = generatedLine;
if (generatedLine === currentLine + 1) {
currentLine = generatedLine;
if (sourceIndex === currentSourceIndex) {
currentSourceIndex = sourceIndex;
if (originalLine === currentOriginalLine + 1) {
currentOriginalLine = originalLine;
return ";AACA";
} else {
str = ";AA";
writeValue(originalLine - currentOriginalLine);
currentOriginalLine = originalLine;
return str + "A";
}
} else {
str = ";A";
writeValue(sourceIndex - currentSourceIndex);
currentSourceIndex = sourceIndex;
writeValue(originalLine - currentOriginalLine);
currentOriginalLine = originalLine;
return str + "A";
}
} else {
str = ";".repeat(generatedLine - currentLine);
currentLine = generatedLine;
if (sourceIndex === currentSourceIndex) {
currentSourceIndex = sourceIndex;
if (originalLine === currentOriginalLine + 1) {
currentOriginalLine = originalLine;
return str + "AACA";
} else {
str += "AA";
writeValue(originalLine - currentOriginalLine);
currentOriginalLine = originalLine;
return str + "A";
}
} else {
str += "A";
writeValue(sourceIndex - currentSourceIndex);
currentSourceIndex = sourceIndex;
writeValue(originalLine - currentOriginalLine);
currentOriginalLine = originalLine;
return str + "A";
}
}
};
};
module.exports = createMappingsSerializer;