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util: Divide inspect() into some subroutines

koichik 13 years ago
parent
ee2c12d48e
commit
98b64422bb
1 changed files with 210 additions and 188 deletions
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  1. 398
      lib/util.js

398
lib/util.js
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@ -95,227 +95,249 @@ var error = exports.error = function(x) {
* output. Default is false (no coloring).
*/
function inspect(obj, showHidden, depth, colors) {
var seen = [];
var stylize = function(str, styleType) {
// http://en.wikipedia.org/wiki/ANSI_escape_code#graphics
var styles =
{ 'bold' : [1, 22],
'italic' : [3, 23],
'underline' : [4, 24],
'inverse' : [7, 27],
'white' : [37, 39],
'grey' : [90, 39],
'black' : [30, 39],
'blue' : [34, 39],
'cyan' : [36, 39],
'green' : [32, 39],
'magenta' : [35, 39],
'red' : [31, 39],
'yellow' : [33, 39] };
var style =
{ 'special': 'cyan',
'number': 'blue',
'boolean': 'yellow',
'undefined': 'grey',
'null': 'bold',
'string': 'green',
'date': 'magenta',
// "name": intentionally not styling
'regexp': 'red' }[styleType];
if (style) {
return '\033[' + styles[style][0] + 'm' + str +
'\033[' + styles[style][1] + 'm';
} else {
return str;
}
var ctx = {
showHidden: showHidden,
seen: [],
stylize: colors ? stylizeWithColor : stylizeNoColor,
};
if (! colors) {
stylize = function(str, styleType) { return str; };
}
return formatValue(ctx, obj, (typeof depth === 'undefined' ? 2 : depth));
}
exports.inspect = inspect;
function format(value, recurseTimes) {
// Provide a hook for user-specified inspect functions.
// Check that value is an object with an inspect function on it
if (value && typeof value.inspect === 'function' &&
// Filter out the util module, it's inspect function is special
value !== exports &&
// Also filter out any prototype objects using the circular check.
!(value.constructor && value.constructor.prototype === value)) {
return value.inspect(recurseTimes);
}
// Primitive types cannot have properties
switch (typeof value) {
case 'undefined':
return stylize('undefined', 'undefined');
// http://en.wikipedia.org/wiki/ANSI_escape_code#graphics
var colors = {
'bold' : [1, 22],
'italic' : [3, 23],
'underline' : [4, 24],
'inverse' : [7, 27],
'white' : [37, 39],
'grey' : [90, 39],
'black' : [30, 39],
'blue' : [34, 39],
'cyan' : [36, 39],
'green' : [32, 39],
'magenta' : [35, 39],
'red' : [31, 39],
'yellow' : [33, 39]
};
case 'string':
var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
.replace(/'/g, "\\'")
.replace(/\\"/g, '"') + '\'';
return stylize(simple, 'string');
var styles = {
'special': 'cyan',
'number': 'blue',
'boolean': 'yellow',
'undefined': 'grey',
'null': 'bold',
'string': 'green',
'date': 'magenta',
// "name": intentionally not styling
'regexp': 'red'
};
case 'number':
return stylize('' + value, 'number');
case 'boolean':
return stylize('' + value, 'boolean');
}
// For some reason typeof null is "object", so special case here.
if (value === null) {
return stylize('null', 'null');
}
function stylizeWithColor(str, styleType) {
var style = styles[styleType];
// Look up the keys of the object.
var visible_keys = Object.keys(value);
var keys = showHidden ? Object.getOwnPropertyNames(value) : visible_keys;
if (style) {
return '\033[' + colors[style][0] + 'm' + str +
'\033[' + colors[style][1] + 'm';
} else {
return str;
}
}
// Functions without properties can be shortcutted.
if (typeof value === 'function' && keys.length === 0) {
var name = value.name ? ': ' + value.name : '';
return stylize('[Function' + name + ']', 'special');
}
// RegExp without properties can be shortcutted
if (isRegExp(value) && keys.length === 0) {
return stylize('' + value, 'regexp');
}
function stylizeNoColor(str, styleType) {
return str;
}
// Dates without properties can be shortcutted
if (isDate(value) && keys.length === 0) {
return stylize(value.toUTCString(), 'date');
}
var base, type, braces;
// Determine the object type
if (isArray(value)) {
type = 'Array';
braces = ['[', ']'];
} else {
type = 'Object';
braces = ['{', '}'];
}
function formatValue(ctx, value, recurseTimes) {
// Provide a hook for user-specified inspect functions.
// Check that value is an object with an inspect function on it
if (value && typeof value.inspect === 'function' &&
// Filter out the util module, it's inspect function is special
value !== exports &&
// Also filter out any prototype objects using the circular check.
!(value.constructor && value.constructor.prototype === value)) {
return value.inspect(recurseTimes);
}
// Make functions say that they are functions
// Primitive types cannot have properties
var primitive = formatPrimitive(ctx, value);
if (primitive) {
return primitive;
}
// Look up the keys of the object.
var visibleKeys = Object.keys(value);
var keys = ctx.showHidden ? Object.getOwnPropertyNames(value) : visibleKeys;
// Some type of object without properties can be shortcutted.
if (keys.length === 0) {
if (typeof value === 'function') {
var n = value.name ? ': ' + value.name : '';
base = ' [Function' + n + ']';
} else {
base = '';
var name = value.name ? ': ' + value.name : '';
return ctx.stylize('[Function' + name + ']', 'special');
}
// Make RegExps say that they are RegExps
if (isRegExp(value)) {
base = ' ' + value;
return ctx.stylize('' + value, 'regexp');
}
// Make dates with properties first say the date
if (isDate(value)) {
base = ' ' + value.toUTCString();
return ctx.stylize(value.toUTCString(), 'date');
}
}
if (keys.length === 0) {
return braces[0] + base + braces[1];
}
var base = '', array = false, braces = ['{', '}'];
if (recurseTimes < 0) {
if (isRegExp(value)) {
return stylize('' + value, 'regexp');
} else {
return stylize('[Object]', 'special');
}
// Make Array say that they are Array
if (isArray(value)) {
array = true;
braces = ['[', ']'];
}
// Make functions say that they are functions
if (typeof value === 'function') {
var n = value.name ? ': ' + value.name : '';
base = ' [Function' + n + ']';
}
// Make RegExps say that they are RegExps
if (isRegExp(value)) {
base = ' ' + value;
}
// Make dates with properties first say the date
if (isDate(value)) {
base = ' ' + value.toUTCString();
}
if (keys.length === 0) {
return braces[0] + base + braces[1];
}
if (recurseTimes < 0) {
if (isRegExp(value)) {
return ctx.stylize('' + value, 'regexp');
} else {
return ctx.stylize('[Object]', 'special');
}
}
seen.push(value);
var output = keys.map(function(key) {
var name, str;
if (value.__lookupGetter__) {
if (value.__lookupGetter__(key)) {
if (value.__lookupSetter__(key)) {
str = stylize('[Getter/Setter]', 'special');
} else {
str = stylize('[Getter]', 'special');
}
} else {
if (value.__lookupSetter__(key)) {
str = stylize('[Setter]', 'special');
}
}
ctx.seen.push(value);
var output = keys.map(function(key) {
return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
});
ctx.seen.pop();
return reduceToSingleString(output, base, braces);
}
function formatPrimitive(ctx, value) {
switch (typeof value) {
case 'undefined':
return ctx.stylize('undefined', 'undefined');
case 'string':
var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
.replace(/'/g, "\\'")
.replace(/\\"/g, '"') + '\'';
return ctx.stylize(simple, 'string');
case 'number':
return ctx.stylize('' + value, 'number');
case 'boolean':
return ctx.stylize('' + value, 'boolean');
}
// For some reason typeof null is "object", so special case here.
if (value === null) {
return ctx.stylize('null', 'null');
}
}
function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
var name, str;
if (value.__lookupGetter__) {
if (value.__lookupGetter__(key)) {
if (value.__lookupSetter__(key)) {
str = ctx.stylize('[Getter/Setter]', 'special');
} else {
str = ctx.stylize('[Getter]', 'special');
}
if (visible_keys.indexOf(key) < 0) {
name = '[' + key + ']';
} else {
if (value.__lookupSetter__(key)) {
str = ctx.stylize('[Setter]', 'special');
}
if (!str) {
if (seen.indexOf(value[key]) < 0) {
if (recurseTimes === null) {
str = format(value[key]);
} else {
str = format(value[key], recurseTimes - 1);
}
if (str.indexOf('\n') > -1) {
if (isArray(value)) {
str = str.split('\n').map(function(line) {
return ' ' + line;
}).join('\n').substr(2);
} else {
str = '\n' + str.split('\n').map(function(line) {
return ' ' + line;
}).join('\n');
}
}
} else {
str = stylize('[Circular]', 'special');
}
}
}
if (visibleKeys.indexOf(key) < 0) {
name = '[' + key + ']';
}
if (!str) {
if (ctx.seen.indexOf(value[key]) < 0) {
if (recurseTimes === null) {
str = formatValue(ctx, value[key], null);
} else {
str = formatValue(ctx, value[key], recurseTimes - 1);
}
if (typeof name === 'undefined') {
if (type === 'Array' && key.match(/^\d+$/)) {
return str;
}
name = JSON.stringify('' + key);
if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
name = name.substr(1, name.length - 2);
name = stylize(name, 'name');
if (str.indexOf('\n') > -1) {
if (array) {
str = str.split('\n').map(function(line) {
return ' ' + line;
}).join('\n').substr(2);
} else {
name = name.replace(/'/g, "\\'")
.replace(/\\"/g, '"')
.replace(/(^"|"$)/g, "'");
name = stylize(name, 'string');
str = '\n' + str.split('\n').map(function(line) {
return ' ' + line;
}).join('\n');
}
}
return name + ': ' + str;
});
seen.pop();
var numLinesEst = 0;
var length = output.reduce(function(prev, cur) {
numLinesEst++;
if (cur.indexOf('\n') >= 0) numLinesEst++;
return prev + cur.length + 1;
}, 0);
if (length > (require('readline').columns || 50)) {
output = braces[0] +
(base === '' ? '' : base + '\n ') +
' ' +
output.join(',\n ') +
' ' +
braces[1];
} else {
output = braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
str = ctx.stylize('[Circular]', 'special');
}
}
if (typeof name === 'undefined') {
if (array && key.match(/^\d+$/)) {
return str;
}
name = JSON.stringify('' + key);
if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
name = name.substr(1, name.length - 2);
name = ctx.stylize(name, 'name');
} else {
name = name.replace(/'/g, "\\'")
.replace(/\\"/g, '"')
.replace(/(^"|"$)/g, "'");
name = ctx.stylize(name, 'string');
}
}
return output;
return name + ': ' + str;
}
function reduceToSingleString(output, base, braces) {
var numLinesEst = 0;
var length = output.reduce(function(prev, cur) {
numLinesEst++;
if (cur.indexOf('\n') >= 0) numLinesEst++;
return prev + cur.length + 1;
}, 0);
if (length > (require('readline').columns || 50)) {
return braces[0] +
(base === '' ? '' : base + '\n ') +
' ' +
output.join(',\n ') +
' ' +
braces[1];
}
return format(obj, (typeof depth === 'undefined' ? 2 : depth));
return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
}
exports.inspect = inspect;
function isArray(ar) {

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