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Export getLineAndColumnMessage via ohm.util.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,120 @@ | ||
| 'use strict'; | ||
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| // -------------------------------------------------------------------- | ||
| // Imports | ||
| // -------------------------------------------------------------------- | ||
|
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| var common = require('./common'); | ||
|
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| // -------------------------------------------------------------------- | ||
| // Private stuff | ||
| // -------------------------------------------------------------------- | ||
|
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| // Given an array of numbers `arr`, return an array of the numbers as strings, | ||
| // right-justified and padded to the same length. | ||
| function padNumbersToEqualLength(arr) { | ||
| var maxLen = 0; | ||
| var strings = arr.map(function(n) { | ||
| var str = n.toString(); | ||
| maxLen = Math.max(maxLen, str.length); | ||
| return str; | ||
| }); | ||
| return strings.map(function(s) { return common.padLeft(s, maxLen); }); | ||
| } | ||
|
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| // -------------------------------------------------------------------- | ||
| // Exports | ||
| // -------------------------------------------------------------------- | ||
|
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| // Return an object with the line and column information for the given | ||
| // offset in `str`. | ||
| exports.getLineAndColumn = function(str, offset) { | ||
| var lineNum = 1; | ||
| var colNum = 1; | ||
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| var currOffset = 0; | ||
| var lineStartOffset = 0; | ||
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| var nextLine = null; | ||
| var prevLine = null; | ||
| var prevLineStartOffset = -1; | ||
|
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| while (currOffset < offset) { | ||
| var c = str.charAt(currOffset++); | ||
| if (c === '\n') { | ||
| lineNum++; | ||
| colNum = 1; | ||
| prevLineStartOffset = lineStartOffset; | ||
| lineStartOffset = currOffset; | ||
| } else if (c !== '\r') { | ||
| colNum++; | ||
| } | ||
| } | ||
|
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||
| // Find the end of the target line. | ||
| var lineEndOffset = str.indexOf('\n', lineStartOffset); | ||
| if (lineEndOffset === -1) { | ||
| lineEndOffset = str.length; | ||
| } else { | ||
| // Get the next line. | ||
| var nextLineEndOffset = str.indexOf('\n', lineEndOffset + 1); | ||
| nextLine = nextLineEndOffset === -1 ? str.slice(lineEndOffset) | ||
| : str.slice(lineEndOffset, nextLineEndOffset); | ||
| // Strip leading and trailing EOL char(s). | ||
| nextLine = nextLine.replace(/^\r?\n/, '').replace(/\r$/, ''); | ||
| } | ||
|
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| // Get the previous line. | ||
| if (prevLineStartOffset >= 0) { | ||
| prevLine = str.slice(prevLineStartOffset, lineStartOffset) | ||
| .replace(/\r?\n$/, ''); // Strip trailing EOL char(s). | ||
| } | ||
|
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| // Get the target line, stripping a trailing carriage return if necessary. | ||
| var line = str.slice(lineStartOffset, lineEndOffset).replace(/\r$/, ''); | ||
|
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| return { | ||
| lineNum: lineNum, | ||
| colNum: colNum, | ||
| line: line, | ||
| prevLine: prevLine, | ||
| nextLine: nextLine | ||
| }; | ||
| }; | ||
|
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| // Return a nicely-formatted string describing the line and column for the | ||
| // given offset in `str`. | ||
| exports.getLineAndColumnMessage = function(str, offset) { | ||
| var lineAndCol = exports.getLineAndColumn(str, offset); | ||
| var sb = new common.StringBuffer(); | ||
| sb.append('Line ' + lineAndCol.lineNum + ', col ' + lineAndCol.colNum + ':\n'); | ||
|
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| // An array of the previous, current, and next line numbers as strings of equal length. | ||
| var lineNumbers = padNumbersToEqualLength([ | ||
| lineAndCol.prevLine == null ? 0 : lineAndCol.lineNum - 1, | ||
| lineAndCol.lineNum, | ||
| lineAndCol.nextLine == null ? 0 : lineAndCol.lineNum + 1 | ||
| ]); | ||
|
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| // Helper for appending formatting input lines to the buffer. | ||
| function appendLine(num, content, prefix) { | ||
| sb.append(prefix + lineNumbers[num] + ' | ' + content + '\n'); | ||
| } | ||
|
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||
| // Include the previous line for context if possible. | ||
| if (lineAndCol.prevLine != null) { | ||
| appendLine(0, lineAndCol.prevLine, ' '); | ||
| } | ||
| // Line that the error occurred on. | ||
| appendLine(1, lineAndCol.line, '> '); | ||
|
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| // Line indicating the column on which the error occurred. | ||
| var gutterWidth = 2 + lineNumbers[1].length + 3; | ||
| sb.append(common.padLeft('^', gutterWidth + lineAndCol.colNum) + '\n'); | ||
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| // Include the next line for context if possible. | ||
| if (lineAndCol.nextLine != null) { | ||
| appendLine(2, lineAndCol.nextLine, ' '); | ||
| } | ||
| return sb.contents(); | ||
| }; |
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