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lexer.c
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executable file
·1516 lines (1431 loc) · 66.4 KB
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#include "cjs-module-lexer.h"
const uint16_t* STANDARD_IMPORT = (uint16_t*)0x1;
const uint16_t* IMPORT_META = (uint16_t*)0x2;
const uint16_t __empty_char = '\0';
const uint16_t* EMPTY_CHAR = &__empty_char;
// tracked depth of template and brackets
#define STACK_DEPTH 2048
// tracked number of star exports
#define MAX_STAR_EXPORTS 256
const uint16_t* source;
bool lastSlashWasDivision;
uint16_t templateStackDepth;
uint16_t openTokenDepth;
uint16_t templateDepth;
uint16_t braceDepth;
uint16_t* lastTokenPos;
uint16_t* pos;
uint16_t* end;
uint16_t* templateStack;
uint16_t** openTokenPosStack;
StarExportBinding* starExportStack;
bool nextBraceIsClass;
uint16_t* lastReexportStart;
uint16_t* lastReexportEnd;
// Memory Structure:
// -> source
// -> analysis starts after source
uint32_t parse_error;
uint32_t error = 0;
uint32_t sourceLen;
uint16_t templateStack_[STACK_DEPTH];
uint16_t* openTokenPosStack_[STACK_DEPTH];
bool openClassPosStack[STACK_DEPTH];
StarExportBinding starExportStack_[MAX_STAR_EXPORTS];
const StarExportBinding* STAR_EXPORT_STACK_END = &starExportStack_[MAX_STAR_EXPORTS - 1];
void (*addExport)(const uint16_t*, const uint16_t*);
void (*addReexport)(const uint16_t*, const uint16_t*);
void (*addUnsafeGetter)(const uint16_t*, const uint16_t*);
void (*clearReexports)();
// Note: parsing is based on the _assumption_ that the source is already valid
uint32_t parseCJS (uint16_t* _source, uint32_t _sourceLen, void (*_addExport)(const uint16_t*, const uint16_t*), void (*_addReexport)(const uint16_t*, const uint16_t*), void (*_addUnsafeGetter)(const uint16_t*, const uint16_t*), void (*_clearReexports)()) {
source = _source;
sourceLen = _sourceLen;
if (_addExport)
addExport = _addExport;
if (_addReexport)
addReexport = _addReexport;
if (_addUnsafeGetter)
addUnsafeGetter = _addUnsafeGetter;
templateStackDepth = 0;
openTokenDepth = 0;
templateDepth = UINT16_MAX;
lastTokenPos = (uint16_t*)EMPTY_CHAR;
lastSlashWasDivision = false;
parse_error = 0;
error = 0;
templateStack = &templateStack_[0];
openTokenPosStack = &openTokenPosStack_[0];
starExportStack = &starExportStack_[0];
nextBraceIsClass = false;
pos = (uint16_t*)(source - 1);
uint16_t ch = '\0';
end = pos + sourceLen;
// Handle #!
if (*source == '#' && *(source + 1) == '!') {
if (sourceLen == 2)
return 0;
pos += 2;
while (pos++ < end) {
ch = *pos;
if (ch == '\n' || ch == '\r')
break;
}
}
while (pos++ < end) {
ch = *pos;
if (ch == 32 || ch < 14 && ch > 8)
continue;
if (openTokenDepth == 0) {
switch (ch) {
case 'i':
if (str_eq5(pos + 1, 'm', 'p', 'o', 'r', 't') && keywordStart(pos))
throwIfImportStatement();
lastTokenPos = pos;
continue;
case 'r': {
uint16_t* startPos = pos;
if (tryParseRequire(Import) && keywordStart(startPos))
tryBacktrackAddStarExportBinding(startPos - 1);
lastTokenPos = pos;
continue;
}
case '_':
if (str_eq22(pos + 1, 'i', 'n', 't', 'e', 'r', 'o', 'p', 'R', 'e', 'q', 'u', 'i', 'r', 'e', 'W', 'i', 'l', 'd', 'c', 'a', 'r', 'd') && (keywordStart(pos) || *(pos - 1) == '.')) {
uint16_t* startPos = pos;
pos += 23;
if (*pos == '(') {
pos++;
openTokenPosStack[openTokenDepth++] = lastTokenPos;
if (tryParseRequire(Import) && keywordStart(startPos))
tryBacktrackAddStarExportBinding(startPos - 1);
}
}
else if (str_eq7(pos + 1, '_', 'e', 'x', 'p', 'o', 'r', 't') && (keywordStart(pos) || *(pos - 1) == '.')) {
pos += 8;
if (str_eq4(pos, 'S', 't', 'a', 'r'))
pos += 4;
if (*pos == '(') {
openTokenPosStack[openTokenDepth++] = lastTokenPos;
if (*(++pos) == 'r')
tryParseRequire(ExportStar);
}
}
lastTokenPos = pos;
continue;
}
}
switch (ch) {
case 'e':
if (str_eq5(pos + 1, 'x', 'p', 'o', 'r', 't') && keywordStart(pos)) {
if (*(pos + 6) == 's')
tryParseExportsDotAssign(false);
else if (openTokenDepth == 0)
throwIfExportStatement();
}
break;
case 'c':
if (keywordStart(pos) && str_eq4(pos + 1, 'l', 'a', 's', 's') && isBrOrWs(*(pos + 5)))
nextBraceIsClass = true;
break;
case 'm':
if (str_eq5(pos + 1, 'o', 'd', 'u', 'l', 'e') && keywordStart(pos))
tryParseModuleExportsDotAssign();
break;
case 'O':
if (str_eq5(pos + 1, 'b', 'j', 'e', 'c', 't') && keywordStart(pos))
tryParseObjectDefineOrKeys(openTokenDepth == 0);
break;
case '(':
openTokenPosStack[openTokenDepth++] = lastTokenPos;
break;
case ')':
if (openTokenDepth == 0)
return syntaxError(8), error;
openTokenDepth--;
break;
case '{':
openClassPosStack[openTokenDepth] = nextBraceIsClass;
nextBraceIsClass = false;
openTokenPosStack[openTokenDepth++] = lastTokenPos;
break;
case '}':
if (openTokenDepth == 0)
return syntaxError(2), false;
if (openTokenDepth-- == templateDepth) {
templateDepth = templateStack[--templateStackDepth];
templateString();
}
else {
if (templateDepth != UINT16_MAX && openTokenDepth < templateDepth)
return syntaxError(3), error;
}
break;
case '<':
// TODO: <!-- XML comment support
break;
case '\'':
case '"':
stringLiteral(ch);
break;
case '/': {
uint16_t next_ch = *(pos + 1);
if (next_ch == '/') {
lineComment();
// dont update lastToken
continue;
}
else if (next_ch == '*') {
blockComment();
// dont update lastToken
continue;
}
else {
// Division / regex ambiguity handling based on checking backtrack analysis of:
// - what token came previously (lastToken)
// - if a closing brace or paren, what token came before the corresponding
// opening brace or paren (lastOpenTokenIndex)
uint16_t lastToken = *lastTokenPos;
if (isExpressionPunctuator(lastToken) &&
!(lastToken == '.' && (*(lastTokenPos - 1) >= '0' && *(lastTokenPos - 1) <= '9')) &&
!(lastToken == '+' && *(lastTokenPos - 1) == '+') && !(lastToken == '-' && *(lastTokenPos - 1) == '-') ||
lastToken == ')' && isParenKeyword(openTokenPosStack[openTokenDepth]) ||
lastToken == '}' && (isExpressionTerminator(openTokenPosStack[openTokenDepth]) || openClassPosStack[openTokenDepth]) ||
lastToken == '/' && lastSlashWasDivision ||
isExpressionKeyword(lastTokenPos) ||
!lastToken) {
regularExpression();
lastSlashWasDivision = false;
}
else {
lastSlashWasDivision = true;
}
}
break;
}
case '`':
if (templateDepth == UINT16_MAX - 1)
return syntaxError(4), error;
templateString();
break;
}
lastTokenPos = pos;
}
if (templateDepth != UINT16_MAX || openTokenDepth || error)
return error;
// success
return 0;
}
void tryBacktrackAddStarExportBinding (uint16_t* bPos) {
while (*bPos == ' ' && bPos > source)
bPos--;
if (*bPos == '=') {
bPos--;
while (*bPos == ' ' && bPos > source)
bPos--;
uint32_t charCode;
uint16_t* id_end = bPos;
bool identifierStart = false;
while ((charCode = fullCharCodeAtLast(bPos)) && bPos > source) {
if (charCode == '\\')
return;
if (!isIdentifierChar(charCode))
break;
identifierStart = isIdentifierStart(charCode);
bPos -= charCodeByteLen(charCode);
}
if (identifierStart && *bPos == ' ') {
// gracefully overflow if there are too many star export bindings to track
if (starExportStack == STAR_EXPORT_STACK_END)
return;
starExportStack->id_start = bPos + 1;
starExportStack->id_end = id_end + 1;
while (*bPos == ' ' && bPos > source)
bPos--;
switch (*bPos) {
case 'r':
if (!readPrecedingKeyword2(bPos - 1, 'v', 'a'))
return;
break;
case 't':
if (!readPrecedingKeyword2(bPos - 1, 'l', 'e') && !readPrecedingKeyword4(bPos - 1, 'c', 'o', 'n', 's'))
return;
break;
default: return;
}
starExportStack++;
}
}
}
bool tryParseObjectHasOwnProperty (uint16_t* it_id_start, ptrdiff_t it_id_len) {
uint16_t ch = commentWhitespace();
if (ch != 'O' || !str_eq5(pos + 1, 'b', 'j', 'e', 'c', 't')) return false;
pos += 6;
ch = commentWhitespace();
if (ch != '.') return false;
pos++;
ch = commentWhitespace();
if (ch == 'p') {
if (!str_eq8(pos + 1, 'r', 'o', 't', 'o', 't', 'y', 'p', 'e')) return false;
pos += 9;
ch = commentWhitespace();
if (ch != '.') return false;
pos++;
ch = commentWhitespace();
}
if (ch != 'h' || !str_eq13(pos + 1, 'a', 's', 'O', 'w', 'n', 'P', 'r', 'o', 'p', 'e', 'r', 't', 'y')) return false;
pos += 14;
ch = commentWhitespace();
if (ch != '.') return false;
pos++;
ch = commentWhitespace();
if (ch != 'c' || !str_eq3(pos + 1, 'a', 'l', 'l')) return false;
pos += 4;
ch = commentWhitespace();
if (ch != '(') return false;
pos++;
ch = commentWhitespace();
if (!identifier(ch)) return false;
ch = commentWhitespace();
if (ch != ',') return false;
pos++;
ch = commentWhitespace();
if (memcmp(pos, it_id_start, it_id_len * sizeof(uint16_t)) != 0) return false;
pos += it_id_len;
ch = commentWhitespace();
if (ch != ')') return false;
pos++;
return true;
}
void tryParseObjectDefineOrKeys (bool keys) {
pos += 6;
uint16_t* revertPos = pos - 1;
uint16_t ch = commentWhitespace();
if (ch == '.') {
pos++;
ch = commentWhitespace();
if (ch == 'd' && str_eq13(pos + 1, 'e', 'f', 'i', 'n', 'e', 'P', 'r', 'o', 'p', 'e', 'r', 't', 'y')) {
uint16_t* exportStart = 0;
uint16_t* exportEnd = 0;
while (true) {
pos += 14;
revertPos = pos - 1;
ch = commentWhitespace();
if (ch != '(') break;
pos++;
ch = commentWhitespace();
if (!readExportsOrModuleDotExports(ch)) break;
ch = commentWhitespace();
if (ch != ',') break;
pos++;
ch = commentWhitespace();
if (ch != '\'' && ch != '"') break;
exportStart = pos;
stringLiteral(ch);
exportEnd = ++pos;
ch = commentWhitespace();
if (ch != ',') break;
pos++;
ch = commentWhitespace();
if (ch != '{') break;
pos++;
ch = commentWhitespace();
if (ch == 'e') {
if (!str_eq9(pos + 1, 'n', 'u', 'm', 'e', 'r', 'a', 'b', 'l', 'e')) break;
pos += 10;
ch = commentWhitespace();
if (ch != ':') break;
pos++;
ch = commentWhitespace();
if (ch != 't' || !str_eq3(pos + 1, 'r', 'u', 'e')) break;
pos += 4;
ch = commentWhitespace();
if (ch != 44) break;
pos++;
ch = commentWhitespace();
}
if (ch == 'v') {
if (!str_eq4(pos + 1, 'a', 'l', 'u', 'e')) break;
pos += 5;
ch = commentWhitespace();
if (ch != ':') break;
addExport(exportStart, exportEnd);
pos = revertPos;
return;
}
else if (ch == 'g') {
if (!str_eq2(pos + 1, 'e', 't')) break;
pos += 3;
ch = commentWhitespace();
if (ch == ':') {
pos++;
ch = commentWhitespace();
if (ch != 'f') break;
if (!str_eq7(pos + 1, 'u', 'n', 'c', 't', 'i', 'o', 'n')) break;
pos += 8;
uint16_t* lastPos = pos;
ch = commentWhitespace();
if (ch != '(' && (lastPos == pos || !identifier(ch))) break;
ch = commentWhitespace();
}
if (ch != '(') break;
pos++;
ch = commentWhitespace();
if (ch != ')') break;
pos++;
ch = commentWhitespace();
if (ch != '{') break;
pos++;
ch = commentWhitespace();
if (ch != 'r') break;
if (!str_eq5(pos + 1, 'e', 't', 'u', 'r', 'n')) break;
pos += 6;
ch = commentWhitespace();
if (!identifier(ch)) break;
ch = commentWhitespace();
if (ch == '.') {
pos++;
ch = commentWhitespace();
if (!identifier(ch)) break;
ch = commentWhitespace();
}
else if (ch == '[') {
pos++;
ch = commentWhitespace();
if (ch == '\'' || ch == '"') stringLiteral(ch);
else break;
pos++;
ch = commentWhitespace();
if (ch != ']') break;
pos++;
ch = commentWhitespace();
}
if (ch == ';') {
pos++;
ch = commentWhitespace();
}
if (ch != '}') break;
pos++;
ch = commentWhitespace();
if (ch == ',') {
pos++;
ch = commentWhitespace();
}
if (ch != '}') break;
pos++;
ch = commentWhitespace();
if (ch != ')') break;
addExport(exportStart, exportEnd);
return;
}
break;
}
if (exportEnd > 0) {
addUnsafeGetter(exportStart, exportEnd);
}
}
else if (keys && ch == 'k' && str_eq3(pos + 1, 'e', 'y', 's')) {
while (true) {
pos += 4;
revertPos = pos - 1;
ch = commentWhitespace();
if (ch != '(') break;
pos++;
ch = commentWhitespace();
uint16_t* id_start = pos;
if (!identifier(ch)) break;
ptrdiff_t id_len = pos - id_start;
ch = commentWhitespace();
if (ch != ')') break;
revertPos = pos++;
ch = commentWhitespace();
if (ch != '.') break;
pos++;
ch = commentWhitespace();
if (ch != 'f' || !str_eq6(pos + 1, 'o', 'r', 'E', 'a', 'c', 'h')) break;
pos += 7;
ch = commentWhitespace();
revertPos = pos - 1;
if (ch != '(') break;
pos++;
ch = commentWhitespace();
if (ch != 'f' || !str_eq7(pos + 1, 'u', 'n', 'c', 't', 'i', 'o', 'n')) break;
pos += 8;
ch = commentWhitespace();
if (ch != '(') break;
pos++;
ch = commentWhitespace();
uint16_t* it_id_start = pos;
if (!identifier(ch)) break;
ptrdiff_t it_id_len = pos - it_id_start;
ch = commentWhitespace();
if (ch != ')') break;
pos++;
ch = commentWhitespace();
if (ch != '{') break;
pos++;
ch = commentWhitespace();
if (ch != 'i' || *(pos + 1) != 'f') break;
pos += 2;
ch = commentWhitespace();
if (ch != '(') break;
pos++;
ch = commentWhitespace();
if (memcmp(pos, it_id_start, it_id_len * sizeof(uint16_t)) != 0) break;
pos += it_id_len;
ch = commentWhitespace();
// `if (` IDENTIFIER$2 `===` ( `'default'` | `"default"` ) `||` IDENTIFIER$2 `===` ( '__esModule' | `"__esModule"` ) `) return` `;`? |
if (ch == '=') {
if (!str_eq2(pos + 1, '=', '=')) break;
pos += 3;
ch = commentWhitespace();
if (ch != '"' && ch != '\'') break;
uint16_t quot = ch;
if (!str_eq7(pos + 1, 'd', 'e', 'f', 'a', 'u', 'l', 't')) break;
pos += 8;
ch = commentWhitespace();
if (ch != quot) break;
pos += 1;
ch = commentWhitespace();
if (ch != '|' || *(pos + 1) != '|') break;
pos += 2;
ch = commentWhitespace();
if (memcmp(pos, it_id_start, it_id_len * sizeof(uint16_t)) != 0) break;
pos += it_id_len;
ch = commentWhitespace();
if (ch != '=' || !str_eq2(pos + 1, '=', '=')) break;
pos += 3;
ch = commentWhitespace();
if (ch != '"' && ch != '\'') break;
quot = ch;
if (!str_eq10(pos + 1, '_', '_', 'e', 's', 'M', 'o', 'd', 'u', 'l', 'e')) break;
pos += 11;
ch = commentWhitespace();
if (ch != quot) break;
pos += 1;
ch = commentWhitespace();
if (ch != ')') break;
pos += 1;
ch = commentWhitespace();
if (ch != 'r' || !str_eq5(pos + 1, 'e', 't', 'u', 'r', 'n')) break;
pos += 6;
ch = commentWhitespace();
if (ch == ';')
pos++;
ch = commentWhitespace();
// `if (`
if (ch == 'i' && *(pos + 1) == 'f') {
bool inIf = true;
pos += 2;
ch = commentWhitespace();
if (ch != '(') break;
pos++;
uint16_t *ifInnerPos = pos;
// `Object.prototype.hasOwnProperty.call(` IDENTIFIER `, ` IDENTIFIER$2 `)) return` `;`?
if (tryParseObjectHasOwnProperty(it_id_start, it_id_len)) {
ch = commentWhitespace();
if (ch != ')') break;
pos++;
ch = commentWhitespace();
if (ch != 'r' || !str_eq5(pos + 1, 'e', 't', 'u', 'r', 'n')) break;
pos += 6;
ch = commentWhitespace();
if (ch == ';')
pos++;
ch = commentWhitespace();
// match next if
if (ch == 'i' && *(pos + 1) == 'f') {
pos += 2;
ch = commentWhitespace();
if (ch != '(') break;
pos++;
}
else {
inIf = false;
}
}
else {
pos = ifInnerPos;
}
// `if (` IDENTIFIER$2 `in` EXPORTS_IDENTIFIER `&&` EXPORTS_IDENTIFIER `[` IDENTIFIER$2 `] ===` IDENTIFIER$1 `[` IDENTIFIER$2 `]) return` `;`?
if (inIf) {
if (memcmp(pos, it_id_start, it_id_len * sizeof(uint16_t)) != 0) break;
pos += it_id_len;
ch = commentWhitespace();
if (ch != 'i' || !str_eq2(pos + 1, 'n', ' ')) break;
pos += 3;
ch = commentWhitespace();
if (!readExportsOrModuleDotExports(ch)) break;
ch = commentWhitespace();
if (ch != '&' || *(pos + 1) != '&') break;
pos += 2;
ch = commentWhitespace();
if (!readExportsOrModuleDotExports(ch)) break;
ch = commentWhitespace();
if (ch != '[') break;
pos++;
ch = commentWhitespace();
if (memcmp(pos, it_id_start, it_id_len * sizeof(uint16_t)) != 0) break;
pos += it_id_len;
ch = commentWhitespace();
if (ch != ']') break;
pos++;
ch = commentWhitespace();
if (ch != '=' || !str_eq2(pos + 1, '=', '=')) break;
pos += 3;
ch = commentWhitespace();
if (memcmp(pos, id_start, id_len * sizeof(uint16_t)) != 0) break;
pos += id_len;
ch = commentWhitespace();
if (ch != '[') break;
pos++;
ch = commentWhitespace();
if (memcmp(pos, it_id_start, it_id_len * sizeof(uint16_t)) != 0) break;
pos += it_id_len;
ch = commentWhitespace();
if (ch != ']') break;
pos++;
ch = commentWhitespace();
if (ch != ')') break;
pos++;
ch = commentWhitespace();
if (ch != 'r' || !str_eq5(pos + 1, 'e', 't', 'u', 'r', 'n')) break;
pos += 6;
ch = commentWhitespace();
if (ch == ';')
pos++;
ch = commentWhitespace();
}
}
}
// `if (` IDENTIFIER$2 `!==` ( `'default'` | `"default"` ) (`&& !` IDENTIFIER `.hasOwnProperty(` IDENTIFIER$2 `)` )? `)`
else if (ch == '!') {
if (!str_eq2(pos + 1, '=', '=')) break;
pos += 3;
ch = commentWhitespace();
if (ch != '"' && ch != '\'') break;
uint16_t quot = ch;
if (!str_eq7(pos + 1, 'd', 'e', 'f', 'a', 'u', 'l', 't')) break;
pos += 8;
ch = commentWhitespace();
if (ch != quot) break;
pos += 1;
ch = commentWhitespace();
if (ch == '&') {
if (*(pos + 1) != '&') break;
pos += 2;
ch = commentWhitespace();
if (ch != '!') break;
pos += 1;
ch = commentWhitespace();
if (ch == 'O' && str_eq6(pos + 1, 'b', 'j', 'e', 'c', 't', '.')) {
if (!tryParseObjectHasOwnProperty(it_id_start, it_id_len)) break;
}
else if (identifier(ch)) {
ch = commentWhitespace();
if (ch != '.') break;
pos++;
ch = commentWhitespace();
if (ch != 'h' || !str_eq13(pos + 1, 'a', 's', 'O', 'w', 'n', 'P', 'r', 'o', 'p', 'e', 'r', 't', 'y')) break;
pos += 14;
ch = commentWhitespace();
if (ch != '(') break;
pos += 1;
ch = commentWhitespace();
if (memcmp(pos, it_id_start, it_id_len * sizeof(uint16_t)) != 0) break;
pos += it_id_len;
ch = commentWhitespace();
if (ch != ')') break;
pos += 1;
}
ch = commentWhitespace();
}
if (ch != ')') break;
pos += 1;
ch = commentWhitespace();
}
else break;
// EXPORTS_IDENTIFIER `[` IDENTIFIER$2 `] =` IDENTIFIER$1 `[` IDENTIFIER$2 `]`
if (readExportsOrModuleDotExports(ch)) {
ch = commentWhitespace();
if (ch != '[') break;
pos++;
ch = commentWhitespace();
if (memcmp(pos, it_id_start, it_id_len * sizeof(uint16_t)) != 0) break;
pos += it_id_len;
ch = commentWhitespace();
if (ch != ']') break;
pos++;
ch = commentWhitespace();
if (ch != '=') break;
pos++;
ch = commentWhitespace();
if (memcmp(pos, id_start, id_len * sizeof(uint16_t)) != 0) break;
pos += id_len;
ch = commentWhitespace();
if (ch != '[') break;
pos++;
ch = commentWhitespace();
if (memcmp(pos, it_id_start, it_id_len * sizeof(uint16_t)) != 0) break;
pos += it_id_len;
ch = commentWhitespace();
if (ch != ']') break;
pos++;
ch = commentWhitespace();
if (ch == ';') {
pos++;
ch = commentWhitespace();
}
}
// `Object.defineProperty(` EXPORTS_IDENTIFIER `, ` IDENTIFIER$2 `, { enumerable: true, get: function () { return ` IDENTIFIER$1 `[` IDENTIFIER$2 `]; } })`
else if (ch == 'O') {
if (!str_eq5(pos + 1, 'b', 'j', 'e', 'c', 't')) break;
pos += 6;
ch = commentWhitespace();
if (ch != '.') break;
pos++;
ch = commentWhitespace();
if (ch != 'd' || !str_eq13(pos + 1, 'e', 'f', 'i', 'n', 'e', 'P', 'r', 'o', 'p', 'e', 'r', 't', 'y')) break;
pos += 14;
ch = commentWhitespace();
if (ch != '(') break;
pos++;
ch = commentWhitespace();
if (!readExportsOrModuleDotExports(ch)) break;
ch = commentWhitespace();
if (ch != ',') break;
pos++;
ch = commentWhitespace();
if (memcmp(pos, it_id_start, it_id_len * sizeof(uint16_t)) != 0) break;
pos += it_id_len;
ch = commentWhitespace();
if (ch != ',') break;
pos++;
ch = commentWhitespace();
if (ch != '{') break;
pos++;
ch = commentWhitespace();
if (ch != 'e' || !str_eq9(pos + 1, 'n', 'u', 'm', 'e', 'r', 'a', 'b', 'l', 'e')) break;
pos += 10;
ch = commentWhitespace();
if (ch != ':') break;
pos++;
ch = commentWhitespace();
if (ch != 't' && !str_eq3(pos + 1, 'r', 'u', 'e')) break;
pos += 4;
ch = commentWhitespace();
if (ch != ',') break;
pos++;
ch = commentWhitespace();
if (ch != 'g' || !str_eq2(pos + 1, 'e', 't')) break;
pos += 3;
ch = commentWhitespace();
if (ch == ':') {
pos++;
ch = commentWhitespace();
if (ch != 'f') break;
if (!str_eq7(pos + 1, 'u', 'n', 'c', 't', 'i', 'o', 'n')) break;
pos += 8;
uint16_t* lastPos = pos;
ch = commentWhitespace();
if (ch != '(' && (lastPos == pos || !identifier(ch))) break;
ch = commentWhitespace();
}
if (ch != '(') break;
pos++;
ch = commentWhitespace();
if (ch != ')') break;
pos++;
ch = commentWhitespace();
if (ch != '{') break;
pos++;
ch = commentWhitespace();
if (ch != 'r' || !str_eq5(pos + 1, 'e', 't', 'u', 'r', 'n')) break;
pos += 6;
ch = commentWhitespace();
if (memcmp(pos, id_start, id_len * sizeof(uint16_t)) != 0) break;
pos += id_len;
ch = commentWhitespace();
if (ch != '[') break;
pos++;
ch = commentWhitespace();
if (memcmp(pos, it_id_start, it_id_len * sizeof(uint16_t)) != 0) break;
pos += it_id_len;
ch = commentWhitespace();
if (ch != ']') break;
pos++;
ch = commentWhitespace();
if (ch == ';') {
pos++;
ch = commentWhitespace();
}
if (ch != '}') break;
pos++;
ch = commentWhitespace();
if (ch == ',') {
pos++;
ch = commentWhitespace();
}
if (ch != '}') break;
pos++;
ch = commentWhitespace();
if (ch != ')') break;
pos++;
ch = commentWhitespace();
if (ch == ';') {
pos++;
ch = commentWhitespace();
}
}
else break;
if (ch != '}') break;
pos++;
ch = commentWhitespace();
if (ch != ')') break;
// search through export bindings to see if this is a star export
// this is done last because it is a linear search through all require bindings
// and by doing this search last after verifying the structure match,
// we don't have to worry about the slow search algorithm
StarExportBinding* curCheckBinding = &starExportStack_[0];
while (curCheckBinding != starExportStack) {
if (id_len == curCheckBinding->id_end - curCheckBinding->id_start &&
0 == memcmp(id_start, curCheckBinding->id_start, id_len * sizeof(uint16_t))) {
addReexport(curCheckBinding->specifier_start, curCheckBinding->specifier_end);
pos = revertPos;
return;
}
curCheckBinding++;
}
return;
}
}
}
pos = revertPos;
}
bool readExportsOrModuleDotExports (uint16_t ch) {
uint16_t* revertPos = pos;
if (ch == 'm' && str_eq5(pos + 1, 'o', 'd', 'u', 'l', 'e')) {
pos += 6;
ch = commentWhitespace();
if (ch != '.') {
pos = revertPos;
return false;
}
pos++;
ch = commentWhitespace();
}
if (ch == 'e' && str_eq6(pos + 1, 'x', 'p', 'o', 'r', 't', 's')) {
pos += 7;
return true;
}
else {
pos = revertPos;
return false;
}
}
void tryParseModuleExportsDotAssign () {
pos += 6;
uint16_t* revertPos = pos - 1;
uint16_t ch = commentWhitespace();
if (ch == '.') {
pos++;
ch = commentWhitespace();
if (ch == 'e' && str_eq6(pos + 1, 'x', 'p', 'o', 'r', 't', 's')) {
tryParseExportsDotAssign(true);
return;
}
}
pos = revertPos;
}
void tryParseExportsDotAssign (bool assign) {
pos += 7;
uint16_t* revertPos = pos - 1;
uint16_t ch = commentWhitespace();
switch (ch) {
// exports.asdf
case '.': {
pos++;
ch = commentWhitespace();
uint16_t* startPos = pos;
if (identifier(ch)) {
uint16_t* endPos = pos;
ch = commentWhitespace();
if (ch == '=') {
addExport(startPos, endPos);
return;
}
}
break;
}
// exports['asdf']
case '[': {
pos++;
ch = commentWhitespace();
if (ch == '\'' || ch == '"') {
uint16_t* startPos = pos;
stringLiteral(ch);
uint16_t* endPos = ++pos;
ch = commentWhitespace();
if (ch != ']') break;
pos++;
ch = commentWhitespace();
if (ch != '=') break;
addExport(startPos, endPos);
}
break;
}
// module.exports =
case '=': {
if (assign) {
clearReexports();
pos++;
ch = commentWhitespace();
// { ... }
if (ch == '{') {
tryParseLiteralExports();
return;
}
// require('...')
if (ch == 'r')
tryParseRequire(ExportAssign);
}
}
}
pos = revertPos;
}
bool tryParseRequire (enum RequireType requireType) {
uint16_t* revertPos = pos;
// require('...')
if (str_eq6(pos + 1, 'e', 'q', 'u', 'i', 'r', 'e')) {
pos += 7;
uint16_t ch = commentWhitespace();
if (ch == '(') {
pos++;
ch = commentWhitespace();
uint16_t* reexportStart = pos;
if (ch == '\'' || ch == '"') {
stringLiteral(ch);
uint16_t* reexportEnd = ++pos;
ch = commentWhitespace();
if (ch == ')') {
switch (requireType) {
case ExportStar:
addReexport(reexportStart, reexportEnd);
return true;
case ExportAssign:
addReexport(reexportStart, reexportEnd);
return true;
default:
starExportStack->specifier_start = reexportStart;
starExportStack->specifier_end = reexportEnd;
return true;
}
}
}
}
pos = revertPos;
}
return false;
}
void tryParseLiteralExports () {
uint16_t* revertPos = pos - 1;
while (pos++ < end) {
uint16_t ch = commentWhitespace();
uint16_t* startPos = pos;
if (identifier(ch)) {
uint16_t* endPos = pos;
ch = commentWhitespace();
if (ch == ':') {
pos++;
ch = commentWhitespace();
// nothing more complex than identifier expressions for now
if (!identifier(ch)) {
pos = revertPos;
return;
}
ch = *pos;
}
addExport(startPos, endPos);
}
else if (ch == '\'' || ch == '"') {
uint16_t* startPos = pos;
stringLiteral(ch);
uint16_t* endPos = ++pos;
ch = commentWhitespace();
if (ch == ':') {
pos++;
ch = commentWhitespace();
// nothing more complex than identifier expressions for now
if (!identifier(ch)) {
pos = revertPos;
return;
}
ch = *pos;
addExport(startPos, endPos);
}
}
else if (ch == '.' && str_eq2(pos + 1, '.', '.')) {
pos += 3;