Reprint pp.js

master
James Long 2017-01-05 12:21:57 -05:00
parent 0d4d21cc68
commit b5ae965274
1 changed files with 242 additions and 190 deletions

432
src/pp.js
View File

@ -2,9 +2,7 @@ const assert = require("assert");
function assertDoc(val) {
assert(
typeof val === "string" ||
(val != null &&
typeof val.type === "string"),
typeof val === "string" || val != null && typeof val.type === "string",
"Value is a valid document"
);
}
@ -15,19 +13,23 @@ function fromString(text) {
function concat(parts) {
parts.forEach(assertDoc);
return { type: 'concat', parts };
return {type: "concat", parts};
}
function indent(n, contents) {
assertDoc(contents);
return { type: 'indent', contents, n };
return {type: "indent", contents, n};
}
function group(contents, opts) {
opts = opts || {};
assertDoc(contents);
return {
type: 'group',
type: "group",
contents: contents,
break: !!opts.shouldBreak,
expandedStates: opts.expandedStates
@ -41,50 +43,47 @@ function multilineGroup(contents, opts) {
}
function conditionalGroup(states, opts) {
return group(states[0], Object.assign(opts || {}, {
expandedStates: states
}));
return group(states[0], Object.assign(opts || {}, {expandedStates: states}));
}
function ifBreak(contents) {
return { type: 'if-break', contents };
return {type: "if-break", contents};
}
function iterDoc(topDoc, func) {
const docs = [topDoc];
while(docs.length !== 0) {
const docs = [ topDoc ];
while (docs.length !== 0) {
const doc = docs.pop();
let res = undefined;
if(typeof doc === "string") {
if (typeof doc === "string") {
const res = func("string", doc);
if(res) {
if (res) {
return res;
}
}
else {
} else {
const res = func(doc.type, doc);
if(res) {
if (res) {
return res;
}
if(doc.type === "concat") {
for(var i = doc.parts.length - 1; i >= 0; i--) {
if (doc.type === "concat") {
for (var i = doc.parts.length - 1; i >= 0; i--) {
docs.push(doc.parts[i]);
}
}
else if(doc.type !== "line") {
} else if (doc.type !== "line") {
docs.push(doc.contents);
}
}
}
}
const line = { type: 'line' };
const softline = { type: 'line', soft: true };
const hardline = { type: 'line', hard: true };
const literalline = { type: 'line', hard: true, literal: true };
const line = {type: "line"};
const softline = {type: "line", soft: true};
const hardline = {type: "line", hard: true};
const literalline = {type: "line", hard: true, literal: true};
function isEmpty(n) {
return typeof n === "string" && n.length === 0;
@ -92,18 +91,21 @@ function isEmpty(n) {
function join(sep, arr) {
var res = [];
for(var i=0; i < arr.length; i++) {
if(i !== 0) {
for (var i = 0; i < arr.length; i++) {
if (i !== 0) {
res.push(sep);
}
res.push(arr[i]);
}
return concat(res);
}
function getFirstString(doc) {
return iterDoc(doc, (type, doc) => {
if(type === "string" && doc.trim().length !== 0) {
if (type === "string" && doc.trim().length !== 0) {
return doc;
}
});
@ -113,21 +115,25 @@ function hasHardLine(doc) {
// TODO: If we hit a group, check if it's already marked as a
// multiline group because they should be marked bottom-up.
return !!iterDoc(doc, (type, doc) => {
switch(type) {
case "line":
if(doc.hard) {
return true;
}
break;
switch (type) {
case "line":
if (doc.hard) {
return true;
}
break;
}
});
}
function _makeIndent(n) {
var s = "";
for(var i=0; i<n; i++) {
for (var i = 0; i < n; i++) {
s += " ";
}
return s;
}
@ -136,60 +142,70 @@ const MODE_FLAT = 2;
function fits(next, restCommands, width) {
let restIdx = restCommands.length;
const cmds = [next];
while(width >= 0) {
if(cmds.length === 0) {
if(restIdx === 0) {
const cmds = [ next ];
while (width >= 0) {
if (cmds.length === 0) {
if (restIdx === 0) {
return true;
}
else {
} else {
cmds.push(restCommands[restIdx - 1]);
restIdx--;
continue;
}
}
const [ind, mode, doc] = cmds.pop();
if(typeof doc === "string") {
const [ ind, mode, doc ] = cmds.pop();
if (typeof doc === "string") {
width -= doc.length;
}
else {
switch(doc.type) {
case "concat":
for(var i = doc.parts.length - 1; i >= 0; i--) {
cmds.push([ind, mode, doc.parts[i]]);
} else {
switch (doc.type) {
case "concat":
for (var i = doc.parts.length - 1; i >= 0; i--) {
cmds.push([ ind, mode, doc.parts[i] ]);
}
break;
case "indent":
cmds.push([ ind + doc.n, mode, doc.contents ]);
break;
case "group":
cmds.push([ ind, (doc.break ? MODE_BREAK : mode), doc.contents ]);
break;
case "if-break":
if (mode === MODE_BREAK) {
cmds.push([ ind, mode, doc.contents ]);
}
break;
case "line":
switch (mode) {
// fallthrough
case MODE_FLAT:
if (!doc.hard) {
if (!doc.soft) {
width -= 1;
}
break;
}
break;
case "indent":
cmds.push([ind + doc.n, mode, doc.contents]);
break;
case "group":
cmds.push([ind, doc.break ? MODE_BREAK : mode, doc.contents]);
break;
case "if-break":
if(mode === MODE_BREAK) {
cmds.push([ind, mode, doc.contents]);
}
break;
case "line":
switch(mode) {
case MODE_FLAT:
if(!doc.hard) {
if(!doc.soft) {
width -= 1;
}
break;
}
// fallthrough
case MODE_BREAK:
return true;
}
break;
case MODE_BREAK:
return true;
}
break;
}
}
}
return false;
}
@ -198,135 +214,171 @@ function print(w, doc) {
// cmds is basically a stack. We've turned a recursive call into a
// while loop which is much faster. The while loop below adds new
// cmds to the array instead of recursively calling `print`.
let cmds = [[0, MODE_BREAK, doc]];
let cmds = [ [ 0, MODE_BREAK, doc ] ];
let out = [];
let shouldRemeasure = false;
while (cmds.length !== 0) {
const [ ind, mode, doc ] = cmds.pop();
while(cmds.length !== 0) {
const [ind, mode, doc] = cmds.pop();
if(typeof doc === "string") {
if (typeof doc === "string") {
out.push(doc);
pos += doc.length;
}
else {
switch(doc.type) {
case "concat":
for(var i = doc.parts.length - 1; i >= 0; i--) {
cmds.push([ind, mode, doc.parts[i]]);
}
break;
case "indent":
cmds.push([ind + doc.n, mode, doc.contents]);
break;
case "group":
switch(mode) {
case MODE_FLAT:
if(!shouldRemeasure) {
cmds.push([ind, doc.break ? MODE_BREAK : MODE_FLAT, doc.contents]);
break;
}
// fallthrough
case MODE_BREAK:
shouldRemeasure = false;
const next = [ind, MODE_FLAT, doc.contents];
let rem = w - pos;
if(!doc.break && fits(next, cmds, rem)) {
cmds.push(next);
}
else {
// Expanded states are a rare case where a document
// can manually provide multiple representations of
// itself. It provides an array of documents
// going from the least expanded (most flattened)
// representation first to the most expanded. If a
// group has these, we need to manually go through
// these states and find the first one that fits.
if(doc.expandedStates) {
const mostExpanded = doc.expandedStates[doc.expandedStates.length - 1];
if(doc.break) {
cmds.push([ind, MODE_BREAK, mostExpanded]);
pos += doc.length;
} else {
switch (doc.type) {
case "concat":
for (var i = doc.parts.length - 1; i >= 0; i--) {
cmds.push([ ind, mode, doc.parts[i] ]);
}
break;
case "indent":
cmds.push([ ind + doc.n, mode, doc.contents ]);
break;
case "group":
switch (mode) {
// fallthrough
case MODE_FLAT:
if (!shouldRemeasure) {
cmds.push([
ind,
(doc.break ? MODE_BREAK : MODE_FLAT),
doc.contents
]);
break;
}
case MODE_BREAK:
shouldRemeasure = false;
const next = [ ind, MODE_FLAT, doc.contents ];
let rem = w - pos;
if (!doc.break && fits(next, cmds, rem)) {
cmds.push(next);
} else {
// Expanded states are a rare case where a document
// can manually provide multiple representations of
// itself. It provides an array of documents
// going from the least expanded (most flattened)
// representation first to the most expanded. If a
// group has these, we need to manually go through
// these states and find the first one that fits.
if (doc.expandedStates) {
const mostExpanded = doc.expandedStates[doc.expandedStates.length -
1];
if (doc.break) {
cmds.push([ ind, MODE_BREAK, mostExpanded ]);
break;
} else {
for (var i = 1; i < doc.expandedStates.length + 1; i++) {
if (i >= doc.expandedStates.length) {
cmds.push([ ind, MODE_BREAK, mostExpanded ]);
break;
}
else {
for(var i=1; i<doc.expandedStates.length + 1; i++) {
if(i >= doc.expandedStates.length) {
cmds.push([ind, MODE_BREAK, mostExpanded]);
break;
}
else {
const state = doc.expandedStates[i];
const cmd = [ind, MODE_FLAT, state];
if(fits(cmd, cmds, rem)) {
cmds.push(cmd);
break;
}
}
} else {
const state = doc.expandedStates[i];
const cmd = [ ind, MODE_FLAT, state ];
if (fits(cmd, cmds, rem)) {
cmds.push(cmd);
break;
}
}
}
else {
cmds.push([ind, MODE_BREAK, doc.contents]);
}
}
break;
} else {
cmds.push([ ind, MODE_BREAK, doc.contents ]);
}
}
break;
case "if-break":
if(mode === MODE_BREAK) {
cmds.push([ind, MODE_BREAK, doc.contents]);
}
break;
case "line":
switch(mode) {
case MODE_FLAT:
if(!doc.hard) {
if(!doc.soft) {
out.push(" ");
pos += 1;
}
break;
}
else {
// This line was forced into the output even if we
// were in flattened mode, so we need to tell the next
// group that no matter what, it needs to remeasure
// because the previous measurement didn't accurately
// capture the entire expression (this is necessary
// for nested groups)
shouldRemeasure = true;
}
// fallthrough
case MODE_BREAK:
if(out.length > 0) {
const lastString = out[out.length - 1];
if(lastString.match(/^\s*\n\s*$/)) {
out[out.length - 1] = "\n";
}
}
if(doc.literal) {
out.push("\n");
pos = 0;
}
else {
out.push("\n" + _makeIndent(ind));
pos = ind;
}
break;
}
break;
default:
}
break;
case "if-break":
if (mode === MODE_BREAK) {
cmds.push([ ind, MODE_BREAK, doc.contents ]);
}
break;
case "line":
switch (mode) {
// fallthrough
case MODE_FLAT:
if (!doc.hard) {
if (!doc.soft) {
out.push(" ");
pos += 1;
}
break;
} else {
// This line was forced into the output even if we
// were in flattened mode, so we need to tell the next
// group that no matter what, it needs to remeasure
// because the previous measurement didn't accurately
// capture the entire expression (this is necessary
// for nested groups)
shouldRemeasure = true;
}
case MODE_BREAK:
if (out.length > 0) {
const lastString = out[out.length - 1];
if (lastString.match(/^\s*\n\s*$/)) {
out[out.length - 1] = "\n";
}
}
if (doc.literal) {
out.push("\n");
pos = 0;
} else {
out.push("\n" + _makeIndent(ind));
pos = ind;
}
break;
}
break;
default:
}
}
};
}
return out.join("");
}
module.exports = {
fromString, concat, isEmpty, join,
line, softline, hardline, literalline, group, multilineGroup,
conditionalGroup, ifBreak, hasHardLine, indent, print, getFirstString
fromString,
concat,
isEmpty,
join,
line,
softline,
hardline,
literalline,
group,
multilineGroup,
conditionalGroup,
ifBreak,
hasHardLine,
indent,
print,
getFirstString
};