246 lines
7.8 KiB
JavaScript
Executable File
246 lines
7.8 KiB
JavaScript
Executable File
const CovLine = require('./line')
|
|
const { sliceRange } = require('./range')
|
|
const { originalPositionFor, generatedPositionFor, GREATEST_LOWER_BOUND, LEAST_UPPER_BOUND } = require('@jridgewell/trace-mapping')
|
|
|
|
module.exports = class CovSource {
|
|
constructor (sourceRaw, wrapperLength) {
|
|
sourceRaw = sourceRaw ? sourceRaw.trimEnd() : ''
|
|
this.lines = []
|
|
this.eof = sourceRaw.length
|
|
this.shebangLength = getShebangLength(sourceRaw)
|
|
this.wrapperLength = wrapperLength - this.shebangLength
|
|
this._buildLines(sourceRaw)
|
|
}
|
|
|
|
_buildLines (source) {
|
|
let position = 0
|
|
let ignoreCount = 0
|
|
let ignoreAll = false
|
|
for (const [i, lineStr] of source.split(/(?<=\r?\n)/u).entries()) {
|
|
const line = new CovLine(i + 1, position, lineStr)
|
|
if (ignoreCount > 0) {
|
|
line.ignore = true
|
|
ignoreCount--
|
|
} else if (ignoreAll) {
|
|
line.ignore = true
|
|
}
|
|
this.lines.push(line)
|
|
position += lineStr.length
|
|
|
|
const ignoreToken = this._parseIgnore(lineStr)
|
|
if (!ignoreToken) continue
|
|
|
|
line.ignore = true
|
|
if (ignoreToken.count !== undefined) {
|
|
ignoreCount = ignoreToken.count
|
|
}
|
|
if (ignoreToken.start || ignoreToken.stop) {
|
|
ignoreAll = ignoreToken.start
|
|
ignoreCount = 0
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Parses for comments:
|
|
* c8 ignore next
|
|
* c8 ignore next 3
|
|
* c8 ignore start
|
|
* c8 ignore stop
|
|
* @param {string} lineStr
|
|
* @return {{count?: number, start?: boolean, stop?: boolean}|undefined}
|
|
*/
|
|
_parseIgnore (lineStr) {
|
|
const testIgnoreNextLines = lineStr.match(/^\W*\/\* c8 ignore next (?<count>[0-9]+) *\*\/\W*$/)
|
|
if (testIgnoreNextLines) {
|
|
return { count: Number(testIgnoreNextLines.groups.count) }
|
|
}
|
|
|
|
// Check if comment is on its own line.
|
|
if (lineStr.match(/^\W*\/\* c8 ignore next *\*\/\W*$/)) {
|
|
return { count: 1 }
|
|
}
|
|
|
|
if (lineStr.match(/\/\* c8 ignore next \*\//)) {
|
|
// Won't ignore successive lines, but the current line will be ignored.
|
|
return { count: 0 }
|
|
}
|
|
|
|
const testIgnoreStartStop = lineStr.match(/\/\* c8 ignore (?<mode>start|stop) *\*\//)
|
|
if (testIgnoreStartStop) {
|
|
if (testIgnoreStartStop.groups.mode === 'start') return { start: true }
|
|
if (testIgnoreStartStop.groups.mode === 'stop') return { stop: true }
|
|
}
|
|
}
|
|
|
|
// given a start column and end column in absolute offsets within
|
|
// a source file (0 - EOF), returns the relative line column positions.
|
|
offsetToOriginalRelative (sourceMap, startCol, endCol) {
|
|
const lines = sliceRange(this.lines, startCol, endCol, true)
|
|
if (!lines.length) return {}
|
|
|
|
const start = originalPositionTryBoth(
|
|
sourceMap,
|
|
lines[0].line,
|
|
Math.max(0, startCol - lines[0].startCol)
|
|
)
|
|
if (!(start && start.source)) {
|
|
return {}
|
|
}
|
|
|
|
let end = originalEndPositionFor(
|
|
sourceMap,
|
|
lines[lines.length - 1].line,
|
|
endCol - lines[lines.length - 1].startCol
|
|
)
|
|
if (!(end && end.source)) {
|
|
return {}
|
|
}
|
|
|
|
if (start.source !== end.source) {
|
|
return {}
|
|
}
|
|
|
|
if (start.line === end.line && start.column === end.column) {
|
|
end = originalPositionFor(sourceMap, {
|
|
line: lines[lines.length - 1].line,
|
|
column: endCol - lines[lines.length - 1].startCol,
|
|
bias: LEAST_UPPER_BOUND
|
|
})
|
|
end.column -= 1
|
|
}
|
|
|
|
return {
|
|
source: start.source,
|
|
startLine: start.line,
|
|
relStartCol: start.column,
|
|
endLine: end.line,
|
|
relEndCol: end.column
|
|
}
|
|
}
|
|
|
|
relativeToOffset (line, relCol) {
|
|
line = Math.max(line, 1)
|
|
if (this.lines[line - 1] === undefined) return this.eof
|
|
return Math.min(this.lines[line - 1].startCol + relCol, this.lines[line - 1].endCol)
|
|
}
|
|
}
|
|
|
|
// this implementation is pulled over from istanbul-lib-sourcemap:
|
|
// https://github.com/istanbuljs/istanbuljs/blob/master/packages/istanbul-lib-source-maps/lib/get-mapping.js
|
|
//
|
|
/**
|
|
* AST ranges are inclusive for start positions and exclusive for end positions.
|
|
* Source maps are also logically ranges over text, though interacting with
|
|
* them is generally achieved by working with explicit positions.
|
|
*
|
|
* When finding the _end_ location of an AST item, the range behavior is
|
|
* important because what we're asking for is the _end_ of whatever range
|
|
* corresponds to the end location we seek.
|
|
*
|
|
* This boils down to the following steps, conceptually, though the source-map
|
|
* library doesn't expose primitives to do this nicely:
|
|
*
|
|
* 1. Find the range on the generated file that ends at, or exclusively
|
|
* contains the end position of the AST node.
|
|
* 2. Find the range on the original file that corresponds to
|
|
* that generated range.
|
|
* 3. Find the _end_ location of that original range.
|
|
*/
|
|
function originalEndPositionFor (sourceMap, line, column) {
|
|
// Given the generated location, find the original location of the mapping
|
|
// that corresponds to a range on the generated file that overlaps the
|
|
// generated file end location. Note however that this position on its
|
|
// own is not useful because it is the position of the _start_ of the range
|
|
// on the original file, and we want the _end_ of the range.
|
|
const beforeEndMapping = originalPositionTryBoth(
|
|
sourceMap,
|
|
line,
|
|
Math.max(column - 1, 1)
|
|
)
|
|
|
|
if (beforeEndMapping.source === null) {
|
|
return null
|
|
}
|
|
|
|
// Convert that original position back to a generated one, with a bump
|
|
// to the right, and a rightward bias. Since 'generatedPositionFor' searches
|
|
// for mappings in the original-order sorted list, this will find the
|
|
// mapping that corresponds to the one immediately after the
|
|
// beforeEndMapping mapping.
|
|
const afterEndMapping = generatedPositionFor(sourceMap, {
|
|
source: beforeEndMapping.source,
|
|
line: beforeEndMapping.line,
|
|
column: beforeEndMapping.column + 1,
|
|
bias: LEAST_UPPER_BOUND
|
|
})
|
|
if (
|
|
// If this is null, it means that we've hit the end of the file,
|
|
// so we can use Infinity as the end column.
|
|
afterEndMapping.line === null ||
|
|
// If these don't match, it means that the call to
|
|
// 'generatedPositionFor' didn't find any other original mappings on
|
|
// the line we gave, so consider the binding to extend to infinity.
|
|
originalPositionFor(sourceMap, afterEndMapping).line !==
|
|
beforeEndMapping.line
|
|
) {
|
|
return {
|
|
source: beforeEndMapping.source,
|
|
line: beforeEndMapping.line,
|
|
column: Infinity
|
|
}
|
|
}
|
|
|
|
// Convert the end mapping into the real original position.
|
|
return originalPositionFor(sourceMap, afterEndMapping)
|
|
}
|
|
|
|
function originalPositionTryBoth (sourceMap, line, column) {
|
|
let original = originalPositionFor(sourceMap, {
|
|
line,
|
|
column,
|
|
bias: GREATEST_LOWER_BOUND
|
|
})
|
|
if (original.line === null) {
|
|
original = originalPositionFor(sourceMap, {
|
|
line,
|
|
column,
|
|
bias: LEAST_UPPER_BOUND
|
|
})
|
|
}
|
|
// The source maps generated by https://github.com/istanbuljs/istanbuljs
|
|
// (using @babel/core 7.7.5) have behavior, such that a mapping
|
|
// mid-way through a line maps to an earlier line than a mapping
|
|
// at position 0. Using the line at positon 0 seems to provide better reports:
|
|
//
|
|
// if (true) {
|
|
// cov_y5divc6zu().b[1][0]++;
|
|
// cov_y5divc6zu().s[3]++;
|
|
// console.info('reachable');
|
|
// } else { ... }
|
|
// ^ ^
|
|
// l5 l3
|
|
const min = originalPositionFor(sourceMap, {
|
|
line,
|
|
column: 0,
|
|
bias: GREATEST_LOWER_BOUND
|
|
})
|
|
if (min.line > original.line) {
|
|
original = min
|
|
}
|
|
return original
|
|
}
|
|
|
|
// Not required since Node 12, see: https://github.com/nodejs/node/pull/27375
|
|
const isPreNode12 = /^v1[0-1]\./u.test(process.version)
|
|
function getShebangLength (source) {
|
|
if (isPreNode12 && source.indexOf('#!') === 0) {
|
|
const match = source.match(/(?<shebang>#!.*)/)
|
|
if (match) {
|
|
return match.groups.shebang.length
|
|
}
|
|
} else {
|
|
return 0
|
|
}
|
|
}
|